1
|
Napper IE, Baroth A, Barrett AC, Bhola S, Chowdhury GW, Davies BFR, Duncan EM, Kumar S, Nelms SE, Niloy MNH, Nishat B, Maddalene T, Smith N, Thompson RC, Koldewey H. The distribution and characterisation of microplastics in air, surface water and sediment within a major river system. Sci Total Environ 2023; 901:166640. [PMID: 37647965 DOI: 10.1016/j.scitotenv.2023.166640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/17/2023] [Accepted: 08/26/2023] [Indexed: 09/01/2023]
Abstract
Rivers are key pathways for the transfer of microplastics (MP) to marine environments. However, there are considerable uncertainties about the amount of microplastics transported by rivers to the ocean; this results in inaccuracies in our understanding of microplastic quantity and transport by freshwater systems. Additionally, it has been suggested that rivers may represent long-term sinks, with microplastics accumulating in sediment due to their high density or other biological, chemical, and physical factors. The atmosphere is also an important pathway by which airborne microplastics may enter aquatic habitats. Here, we compare for first time microplastics type and concentration in these key environmental mediums (air, water and sediment) along a major river (Ganges), from sea to source to understand 1) the abundance, 2) the spatial distribution, and 3) characteristics. Mean microplastic abundance settling from the atmosphere was 41.12 MP m2 day-1; while concentrations in sediment were 57.00 MP kg-1 and in water were 0.05 MP L-1. Across all sites and environmental mediums, rayon (synthetically altered cellulose) was the dominant polymer (54-82 %), followed by acrylic (6-23 %) and polyester (9-17 %). Fibres were the dominant shape (95-99 %) and blue was the most common colour (48-79 %). Across water and sediment environmental mediums, the number of microplastics per sample increased from the source of the Ganges to the sea. Additionally, higher population densities correlated with increased microplastic abundance for air and water samples. We suggest that clothing is likely to be the prominent source of microplastics to the river system, influenced by atmospheric deposition, wastewater and direct input (e.g. handwashing of clothes in the Ganges), especially in high density population areas. However, we suggest that subsequent microplastic release to the marine environment is strongly influenced by polymer type and shape, with a large proportion of denser microplastics settling in sediment prior to the river discharging to the ocean.
Collapse
Affiliation(s)
- Imogen E Napper
- International Marine Litter Research Unit, University of Plymouth, UK; School of Biological and Marine Sciences, University of Plymouth, UK.
| | - Anju Baroth
- Wildlife Institute of India, Dehradun, Uttarakhand, India
| | - Aaron C Barrett
- School of Biological and Marine Sciences, University of Plymouth, UK
| | - Sunanda Bhola
- Wildlife Institute of India, Dehradun, Uttarakhand, India
| | - Gawsia W Chowdhury
- Department of Zoology, University of Dhaka, Dhaka 1000, Bangladesh; WildTeam, 69/1 New Circular Road, Malibagh, Dhaka 1217, Bangladesh
| | - Bede F R Davies
- Nantes Université, Institut des Substances et Organismes de la Mer, ISOMer, UR2160, Nantes, F-44000, France
| | - Emily M Duncan
- Centre for Ecology and Conservation, University of Exeter, Penryn Campus, UK
| | - Sumit Kumar
- Wildlife Institute of India, Dehradun, Uttarakhand, India
| | - Sarah E Nelms
- Centre for Ecology and Conservation, University of Exeter, Penryn Campus, UK
| | - Md Nazmul Hasan Niloy
- Department of Zoology, University of Dhaka, Dhaka 1000, Bangladesh; WildTeam, 69/1 New Circular Road, Malibagh, Dhaka 1217, Bangladesh
| | | | - Taylor Maddalene
- National Geographic Society, Washington, DC, USA; University of Georgia, Athens, GA, USA
| | - Natalie Smith
- International Marine Litter Research Unit, University of Plymouth, UK; Plymouth Marine Laboratory, UK
| | - Richard C Thompson
- International Marine Litter Research Unit, University of Plymouth, UK; School of Biological and Marine Sciences, University of Plymouth, UK
| | - Heather Koldewey
- Centre for Ecology and Conservation, University of Exeter, Penryn Campus, UK; Zoological Society of London, London, UK
| |
Collapse
|
2
|
Napper IE, Davies AJ, Jah M, Miner KR, Thompson RC, Quinn M, Koldewey HJ. Protect Earth's orbit: Avoid high seas mistakes. Science 2023; 379:990-991. [PMID: 36893228 DOI: 10.1126/science.adg8989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Affiliation(s)
- Imogen E Napper
- International Marine Litter Research Unit, University of Plymouth, Plymouth, PL4 8AA, UK
| | | | - Moriba Jah
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX, USA
| | - Kimberley R Miner
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Richard C Thompson
- International Marine Litter Research Unit, University of Plymouth, Plymouth, PL4 8AA, UK
| | - Melissa Quinn
- Spaceport Cornwall, Cornwall Airport Newquay, Newquay TR8 4RQ, UK
| | | |
Collapse
|
3
|
Napper IE, Parker-Jurd FNF, Wright SL, Thompson RC. Examining the release of synthetic microfibres to the environment via two major pathways: Atmospheric deposition and treated wastewater effluent. Sci Total Environ 2023; 857:159317. [PMID: 36220472 DOI: 10.1016/j.scitotenv.2022.159317] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 09/21/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
Research on the discharge of synthetic microfibres to aquatic environments has typically focused on laundering, where fibres can be discharged via wastewater effluent. However emerging research suggests that microfibres generated during the wear of textiles in normal use could present a major, additional, pathway for microfibre pollution to the environment. This study aimed to quantify and compare the quantities of microfibre entering the marine environment via both these pathways; wastewater discharge and atmospheric deposition. Areas of high and low population density were also evaluated. Samples were collected in and around two British cities (Bristol and Plymouth) both of which are located on tidal waters. Fibres originating from the atmosphere were deposited at an average rate of 81.6 fibres m2 d-1 across urban and rural areas. Treated wastewater effluent contained on an average 0.03 synthetic fibres L-1. Based on our results we predict ~20,000-500,000 microfibres could be discharged per day from the Wastewater Treatment Plants studied. When the two pathways were compared. Atmospheric deposition of synthetic microfibres appeared the dominant pathway, releasing fibres at a rate several orders of magnitude greater than via treated wastewater effluent. Potential options to reduce the release of microfibres to the environment are discussed and we conclude that intervention at the textile design stage presents the most effective approach. In order to guide policy intervention to inform the Plastics Treaty UNEA 5.2, future work should focus on understanding which permutations of textile design have the greatest influence fibre shedding, during both everyday use and laundering.
Collapse
Affiliation(s)
- I E Napper
- International Marine Litter Research Unit, School of Biological and Marine Sciences, University of Plymouth, Drake's Circus, Plymouth PL4 8AA, UK
| | - F N F Parker-Jurd
- International Marine Litter Research Unit, School of Biological and Marine Sciences, University of Plymouth, Drake's Circus, Plymouth PL4 8AA, UK.
| | - S L Wright
- MRC Centre for Environment and Health, Imperial College London, White City Campus, 80-92 Wood Lane, London W12 0BZ, UK
| | - R C Thompson
- International Marine Litter Research Unit, School of Biological and Marine Sciences, University of Plymouth, Drake's Circus, Plymouth PL4 8AA, UK
| |
Collapse
|
4
|
Ford HV, Jones NH, Davies AJ, Godley BJ, Jambeck JR, Napper IE, Suckling CC, Williams GJ, Woodall LC, Koldewey HJ. The fundamental links between climate change and marine plastic pollution. Sci Total Environ 2022; 806:150392. [PMID: 34583073 DOI: 10.1016/j.scitotenv.2021.150392] [Citation(s) in RCA: 57] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 08/27/2021] [Accepted: 09/13/2021] [Indexed: 05/25/2023]
Abstract
Plastic pollution and climate change have commonly been treated as two separate issues and sometimes are even seen as competing. Here we present an alternative view that these two issues are fundamentally linked. Primarily, we explore how plastic contributes to greenhouse gas (GHG) emissions from the beginning to the end of its life cycle. Secondly, we show that more extreme weather and floods associated with climate change, will exacerbate the spread of plastic in the natural environment. Finally, both issues occur throughout the marine environment, and we show that ecosystems and species can be particularly vulnerable to both, such as coral reefs that face disease spread through plastic pollution and climate-driven increased global bleaching events. A Web of Science search showed climate change and plastic pollution studies in the ocean are often siloed, with only 0.4% of the articles examining both stressors simultaneously. We also identified a lack of regional and industry-specific life cycle analysis data for comparisons in relative GHG contributions by materials and products. Overall, we suggest that rather than debate over the relative importance of climate change or marine plastic pollution, a more productive course would be to determine the linking factors between the two and identify solutions to combat both crises.
Collapse
Affiliation(s)
- Helen V Ford
- School of Ocean Sciences, Bangor University, Anglesey LL59 5AB, UK.
| | - Nia H Jones
- School of Ocean Sciences, Bangor University, Anglesey LL59 5AB, UK
| | - Andrew J Davies
- Biological Sciences, University of Rhode Island, 120 Flagg Road University of Rhode Island Kingston, RI 02881, USA
| | - Brendan J Godley
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, TR10 9FE, UK
| | - Jenna R Jambeck
- College of Engineering, University of Georgia, GA 30602, Athens, USA
| | - Imogen E Napper
- International Marine Litter Research Unit, School of Biological and Marine Sciences University of Plymouth, Plymouth PL4 8AA, UK
| | - Coleen C Suckling
- Fisheries, Animal and Veterinary Sciences, University of Rhode Island, Kingston, RI 02881, USA
| | | | - Lucy C Woodall
- Department of Zoology, University of Oxford, Oxford OX1 3SZ, UK; Nekton, Science Park, Begbroke, Oxford, OX5 1PF, UK
| | - Heather J Koldewey
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, TR10 9FE, UK; Zoological Society of London, Regent's Park, London, UK
| |
Collapse
|
5
|
Parker-Jurd FNF, Napper IE, Abbott GD, Hann S, Thompson RC. Quantifying the release of tyre wear particles to the marine environment via multiple pathways. Mar Pollut Bull 2021; 172:112897. [PMID: 34482249 DOI: 10.1016/j.marpolbul.2021.112897] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 08/19/2021] [Accepted: 08/20/2021] [Indexed: 06/13/2023]
Abstract
Desk-based studies have suggested tyre wear particles contribute a substantial portion of microplastic emissions to the environment, yet few empirical studies report finding tyre wear. Samples were collected from three pathways to the marine environment: atmospheric deposition, treated wastewater effluent, and untreated surface runoff. Pyrolysis coupled to gas chromatography-mass spectrometry was used to detect benzothiazole, a molecular marker for tyres. Benzothiazole was detected in each pathway, emitting tyre wear in addition to other sources of microplastics. Release via surface water drainage was the principle pathway in the regions examined. Laboratory tests indicated larger particles likely settle close to their entry points, whereas smaller particles have potential for longer-range transport and dispersal. The previous lack of reports are likely a consequence of inadequate methods of detection, rather than a low environmental presence. Further work is required to establish distribution, transport potential, and potential impacts once within the marine environment.
Collapse
Affiliation(s)
- Florence N F Parker-Jurd
- School of Biological and Marine Sciences, University of Plymouth, Drakes Circus, Plymouth PL4 8AA, UK.
| | - Imogen E Napper
- School of Biological and Marine Sciences, University of Plymouth, Drakes Circus, Plymouth PL4 8AA, UK
| | - Geoffrey D Abbott
- School of Natural and Environmental Sciences, Drummond Building, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
| | - Simon Hann
- Eunomia Research & Consulting Ltd., 37 Queen Square, Bristol BS1 4QS, UK
| | - Richard C Thompson
- School of Biological and Marine Sciences, University of Plymouth, Drakes Circus, Plymouth PL4 8AA, UK
| |
Collapse
|
6
|
Napper IE, Baroth A, Barrett AC, Bhola S, Chowdhury GW, Davies BFR, Duncan EM, Kumar S, Nelms SE, Hasan Niloy MN, Nishat B, Maddalene T, Thompson RC, Koldewey H. The abundance and characteristics of microplastics in surface water in the transboundary Ganges River. Environ Pollut 2021; 274:116348. [PMID: 33423832 DOI: 10.1016/j.envpol.2020.116348] [Citation(s) in RCA: 107] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 12/15/2020] [Accepted: 12/16/2020] [Indexed: 05/06/2023]
Abstract
Microplastics (plastic < 5 mm in size) are now known to contaminate riverine systems but understanding about how their concentrations vary spatially and temporally is limited. This information is critical to help identify key sources and pathways of microplastic and develop management interventions. This study provides the first investigation of microplastic abundance, characteristics and temporal variation along the Ganges river; one of the most important catchments of South Asia. From 10 sites along a 2575 km stretch of the river, 20 water samples (3600 L in total) were filtered (60 samples each from pre- and post-monsoon season). Overall, 140 microplastic particles were identified, with higher concentrations found in the pre-monsoon (71.6%) than in post-monsoon (61.6%) samples. The majority of microplastics were fibres (91%) and the remaining were fragments (9%). We estimate that the Ganges, with the combined flows of the Brahmaputra and Meghna rivers (GBM), could release up to 1-3 billion (109) microplastics into the Bay of Bengal (north-eastern portion of the Indian Ocean) every day. This research provides the first step in understanding microplastic contamination in the Ganges and its contribution to the oceanic microplastic load.
Collapse
Affiliation(s)
- Imogen E Napper
- International Marine Litter Research Unit, University of Plymouth, Plymouth, PL4 8AA, UK.
| | - Anju Baroth
- Wildlife Institute of India, Chandrabani, Dehradun, 248001, India
| | - Aaron C Barrett
- Faculty of Science and Engineering, University of Plymouth, UK
| | - Sunanda Bhola
- Wildlife Institute of India, Chandrabani, Dehradun, 248001, India
| | - Gawsia W Chowdhury
- Department of Zoology, University of Dhaka, Dhaka, 1000, Bangladesh; WildTeam, 69/1 New Circular Road, Malibagh, Dhaka, 1217, Bangladesh
| | - Bede F R Davies
- School of Biological and Marine Sciences, University of Plymouth, UK
| | - Emily M Duncan
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, TR10 9FE, UK
| | - Sumit Kumar
- Wildlife Institute of India, Chandrabani, Dehradun, 248001, India
| | - Sarah E Nelms
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, TR10 9FE, UK; Centre for Circular Economy, University of Exeter, Cornwall, TR10 9FE, UK
| | | | - Bushra Nishat
- Isabella Foundation, House- 13, Road- 15 (new) 28 (old), Dhanmondi R/A, Dhaka 1209, Bangladesh; World Bank, Plot # E-32 Agargaon, Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh
| | | | - Richard C Thompson
- International Marine Litter Research Unit, University of Plymouth, Plymouth, PL4 8AA, UK
| | - Heather Koldewey
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, TR10 9FE, UK; Zoological Society of London, Regent's Park, London, UK
| |
Collapse
|
7
|
Chowdhury GW, Koldewey HJ, Duncan E, Napper IE, Niloy MNH, Nelms SE, Sarker S, Bhola S, Nishat B. Plastic pollution in aquatic systems in Bangladesh: A review of current knowledge. Sci Total Environ 2021; 761:143285. [PMID: 33172641 DOI: 10.1016/j.scitotenv.2020.143285] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 10/03/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
Rivers play a crucial role in transporting land-based plastic waste to the ocean, with the Ganges reported as the second largest contributing river of plastic pollution globally. To better quantify global plastic pollution transport and effectively reduce the sources and risks imposed, a clear understanding of the origin, transport, fate, and effects of riverine plastic debris is important. In this review paper, we discuss the current state of knowledge of plastic pollution in aquatic systems in Bangladesh and evaluate existing research gaps. Bangladesh has been recognized as an internationally significant nation in the plastic pollution crisis, but this paper identifies a major disconnect in knowledge, understanding and capacity to understand and address this critical environmental and public health issue. Here, we review all available scientific publications on plastic pollution in the freshwater and marine environment in Bangladesh and identify key research themes. A total of 24 studies relevant to plastic pollution were published from 2006 to 2019, of which 18 were selected for this study under the authors' criteria. Nine focused on plastic pollution in the marine environment, eight focused on plastic waste generation and management and only one focused on the freshwater environment. We compared our findings with three other countries in the Global South with comparable per capita gross domestic product (GDP) and mismanaged waste, namely Cambodia, Kenya, and Tanzania, revealing similar knowledge gaps. This lack of research demonstrates a need for further work to monitor and model riverine plastic transport and examine the implications for aquatic organisms. This will facilitate the formulation of national management strategies aimed at addressing plastic pollution.
Collapse
Affiliation(s)
- Gawsia Wahidunnessa Chowdhury
- Department of Zoology, University of Dhaka, Dhaka 1000, Bangladesh; WildTeam, 69/1 New Circular Road, Malibagh, Dhaka 1217, Bangladesh.
| | - Heather J Koldewey
- Zoological Society of London, Regent's Park, London NW1 4RY, UK; Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK
| | - Emily Duncan
- Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK
| | - Imogen E Napper
- International Marine Litter Research Unit, University of Plymouth, Plymouth PL4 8AA, UK
| | - Md Nazmul Hasan Niloy
- Department of Zoology, University of Dhaka, Dhaka 1000, Bangladesh; WildTeam, 69/1 New Circular Road, Malibagh, Dhaka 1217, Bangladesh
| | - Sarah E Nelms
- Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK; Centre for Circular Economy, University of Exeter, Cornwall TR10 9EZ, UK
| | - Subrata Sarker
- WildTeam, 69/1 New Circular Road, Malibagh, Dhaka 1217, Bangladesh; Department of Oceanography, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
| | - Sunanda Bhola
- Wildlife Institute of India, Wildlife Institute Rd, Chandrabani, Dehradun, Uttarakhand 248002, India
| | - Bushra Nishat
- Isabela Foundation, House-13, Road-15 (new) 28 (old), Dhanmondi R/A, Dhaka 1209, Bangladesh; The World Bank, Plot # E-32 Agargaon, Sher-e-Bangla Nagar, Dhaka 1207, Bangladesh
| |
Collapse
|
8
|
Miner KR, Clifford H, Taruscio T, Potocki M, Solomon G, Ritari M, Napper IE, Gajurel AP, Mayewski PA. Deposition of PFAS 'forever chemicals' on Mt. Everest. Sci Total Environ 2021; 759:144421. [PMID: 33353778 DOI: 10.1016/j.scitotenv.2020.144421] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 12/07/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
Mt. Everest, one of the most coveted climbing mountains on earth, also contains the highest altitude chemical contamination on land. For the first time, meltwater and snow samples from Mt. Everest's Khumbu Glacier were analyzed for "forever chemicals" per- and polyfluoroalkyl substances (PFAS). Our research team utilized solid-phase extraction (SPE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) to identify pollutants sampled from Everest Base Camp, Camp 1, Camp 2, and Everest Balcony. From the 14 PFAS compounds tested for, we found perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), and perfluorohexanoic acid (PFHxA) in Mt. Everest snow and meltwater. The highest concentrations found were 26.14 ng/L and 10.34 ng/L PFOS at Base Camp and Camp 2, respectively. However, PFAS species were seen within 1-2 orders of magnitude in all sampling sites with detection, potentially suggesting a widespread presence on the mountain. Our samples are the highest altitude PFAS samples ever retrieved and indicate the need for further sampling both on Mt. Everest and in the below-glacier watershed.
Collapse
Affiliation(s)
- K R Miner
- Climate Change Institute, University of Maine, ME, USA; Jet Propulsion Laboratory, California Institute of Technology, CA, USA.
| | - H Clifford
- Climate Change Institute, University of Maine, ME, USA; School of Earth and Climate Sciences, University of Maine, ME, USA
| | | | - M Potocki
- Climate Change Institute, University of Maine, ME, USA; School of Earth and Climate Sciences, University of Maine, ME, USA
| | | | | | - I E Napper
- International Marine Litter Research Unit, University of Plymouth, UK
| | - A P Gajurel
- Department of Geology, Tri-Chandra Campus, Tribhuvan University, Nepal
| | - P A Mayewski
- Climate Change Institute, University of Maine, ME, USA
| |
Collapse
|
9
|
Nelms SE, Duncan EM, Patel S, Badola R, Bhola S, Chakma S, Chowdhury GW, Godley BJ, Haque AB, Johnson JA, Khatoon H, Kumar S, Napper IE, Niloy MNH, Akter T, Badola S, Dev A, Rawat S, Santillo D, Sarker S, Sharma E, Koldewey H. Riverine plastic pollution from fisheries: Insights from the Ganges River system. Sci Total Environ 2021; 756:143305. [PMID: 33199004 DOI: 10.1016/j.scitotenv.2020.143305] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/23/2020] [Accepted: 10/23/2020] [Indexed: 06/11/2023]
Abstract
Abandoned, lost or otherwise discarded fishing gear represents a substantial proportion of global marine plastic pollution and can cause significant environmental and socio-economic impacts. Yet little is known about its presence in, and implications for, freshwater ecosystems or its downstream contribution to plastic pollution in the ocean. This study documents fishing gear-related debris in one of the world's largest plastic pollution contributing river catchments, the Ganges. Riverbank surveys conducted along the length of the river, from the coast in Bangladesh to the Himalaya in India, show that derelict fishing gear density increases with proximity to the sea. Fishing nets were the main gear type by volume and all samples examined for polymer type were plastic. Illegal gear types and restricted net mesh sizes were also recorded. Socio-economic surveys of fisher communities explored the behavioural drivers of plastic waste input from one of the world's largest inland fisheries and revealed short gear lifespans and high turnover rates, lack of appropriate end-of-life gear disposal methods and ineffective fisheries regulations. A biodiversity threat assessment identified the air-breathing aquatic vertebrate species most at risk of entanglement in, and impacts from, derelict fishing gear; namely species of threatened freshwater turtle and otter, and the endangered Ganges river dolphin. This research demonstrates a need for targeted and practical interventions to limit the input of fisheries-related plastic pollution to this major river system and ultimately, the global ocean. The approach used in this study could be replicated to examine the inputs, socio-economic drivers and ecological impacts of this previously uncharacterised but important source of plastic pollution in other major rivers worldwide.
Collapse
Affiliation(s)
- Sarah E Nelms
- Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK; Centre for Circular Economy, University of Exeter, Cornwall TR10 9EZ, UK.
| | - Emily M Duncan
- Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK
| | - Surshti Patel
- Zoological Society of London, Regent's Park, London NW1 4RY, UK
| | - Ruchi Badola
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - Sunanda Bhola
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - Surfarsha Chakma
- Isabela Foundation, Road-15 (new), Dhanmondi-R/A, Dhaka 1209, Bangladesh
| | - Gawsia Wahidunnessa Chowdhury
- Department of Zoology, University of Dhaka, Dhaka 1000, Bangladesh; WildTeam, 69/1 New Circular Road, Dhaka 1217, Bangladesh
| | - Brendan J Godley
- Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK
| | - Alifa Bintha Haque
- Department of Zoology, University of Dhaka, Dhaka 1000, Bangladesh; Nature-based Solutions Initiative, Department of Zoology, University of Oxford, Oxford OX1 3SZ, UK
| | | | - Hina Khatoon
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - Sumit Kumar
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - Imogen E Napper
- International Marine Litter Research Unit, University of Plymouth, Plymouth PL4 8AA, UK
| | | | - Tanjila Akter
- Department of Zoology, University of Dhaka, Dhaka 1000, Bangladesh
| | - Srishti Badola
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - Aditi Dev
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - Sunita Rawat
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - David Santillo
- Greenpeace Research Laboratories, Innovation Centre Phase 2, University of Exeter, Devon EX4 4RN, UK
| | - Subrata Sarker
- Department of Oceanography, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
| | - Ekta Sharma
- Wildlife Institute of India, Chandrabani Road, Dehradun 248001, Uttarakhand, India
| | - Heather Koldewey
- Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK; Zoological Society of London, Regent's Park, London NW1 4RY, UK
| |
Collapse
|
10
|
Napper IE, Barrett AC, Thompson RC. The efficiency of devices intended to reduce microfibre release during clothes washing. Sci Total Environ 2020; 738:140412. [PMID: 32682545 DOI: 10.1016/j.scitotenv.2020.140412] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 06/19/2020] [Accepted: 06/19/2020] [Indexed: 05/17/2023]
Abstract
The washing of synthetic clothes is considered to be a substantial source of microplastic to the environment. Therefore, various devices have been designed to capture microfibres released from clothing during the washing cycle. In this study, we compared 6 different devices which varied from prototypes to commercially available products. These were designed to either be placed inside the drum during the washing cycle or fitted externally to filter the effluent wastewater discharge. The aim of this study was to examine the efficacy of these devices at mitigating microfibre release from clothing during washing or at capturing any microfibres released in the wastewater. When compared to the amount of microfibres entering the wastewater without any device (control), the XFiltra filter was the most successful device. This device captured microfibres reducing their release to wastewater by around 78%. The Guppyfriend bag was the second most successful device, reducing microfibre release to wastewater by around 54%; it appeared to mainly work by reducing microfibre shedding from the clothing during the washing cycle. Despite some potentially promising results it is important to recognise that fibres are also released when garments are worn in everyday use. Researchers and industry need to continue to collaborate to better understand the best intervention points to reduce microfibre shedding, by considering both product design and fibre capture.
Collapse
Affiliation(s)
- Imogen E Napper
- International Marine Litter Research Unit, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, U.K..
| | - Aaron C Barrett
- International Marine Litter Research Unit, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, U.K
| | - Richard C Thompson
- International Marine Litter Research Unit, School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, U.K
| |
Collapse
|
11
|
Napper IE, Thompson RC. Environmental Deterioration of Biodegradable, Oxo-biodegradable, Compostable, and Conventional Plastic Carrier Bags in the Sea, Soil, and Open-Air Over a 3-Year Period. Environ Sci Technol 2019; 53:4775-4783. [PMID: 31030509 DOI: 10.1021/acs.est.8b06984] [Citation(s) in RCA: 140] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
There is clear evidence that discarded single-use carrier bags are accumulating in the environment. As a result, various plastic formulations have been developed which state they deteriorate faster and/or have fewer impacts on the environment because their persistence is shorter. This study examined biodegradable, oxo-biodegradable, compostable, and high-density polyethylene (i.e., a conventional plastic carrier bag) materials over a 3 year period. These materials were exposed in three natural environments; open-air, buried in soil, and submersed in seawater, as well as in controlled laboratory conditions. In the marine environment, the compostable bag completely disappeared within 3 months. However, the same compostable bag type was still present in the soil environment after 27 months but could no longer hold weight without tearing. After 9 months exposure in the open-air, all bag materials had disintegrated into fragments. Collectively, our results showed that none of the bags could be relied upon to show any substantial deterioration over a 3 year period in all of the environments. It is therefore not clear that the oxo-biodegradable or biodegradable formulations provide sufficiently advanced rates of deterioration to be advantageous in the context of reducing marine litter, compared to conventional bags.
Collapse
Affiliation(s)
- Imogen E Napper
- International Marine Litter Research Unit, School of Biological and Marine Sciences , University of Plymouth , Drake Circus, Plymouth , Devon PL4 8AA , U.K
| | - Richard C Thompson
- International Marine Litter Research Unit, School of Biological and Marine Sciences , University of Plymouth , Drake Circus, Plymouth , Devon PL4 8AA , U.K
| |
Collapse
|
12
|
Napper IE, Thompson RC. Release of synthetic microplastic plastic fibres from domestic washing machines: Effects of fabric type and washing conditions. Mar Pollut Bull 2016; 112:39-45. [PMID: 27686821 DOI: 10.1016/j.marpolbul.2016.09.025] [Citation(s) in RCA: 582] [Impact Index Per Article: 72.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 09/13/2016] [Accepted: 09/14/2016] [Indexed: 05/20/2023]
Abstract
Washing clothes made from synthetic materials has been identified as a potentially important source of microscopic fibres to the environment. This study examined the release of fibres from polyester, polyester-cotton blend and acrylic fabrics. These fabrics were laundered under various conditions of temperature, detergent and conditioner. Fibres from waste effluent were examined and the mass, abundance and fibre size compared between treatments. Average fibre size ranged between 11.9 and 17.7μm in diameter, and 5.0 and 7.8mm in length. Polyester-cotton fabric consistently shed significantly fewer fibres than either polyester or acrylic. However, fibre release varied according to wash treatment with various complex interactions. We estimate over 700,000 fibres could be released from an average 6kg wash load of acrylic fabric. As fibres have been reported in effluent from sewage treatment plants, our data indicates fibres released by washing of clothing could be an important source of microplastics to aquatic habitats.
Collapse
Affiliation(s)
- Imogen E Napper
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon, PL4 8AA, England.
| | - Richard C Thompson
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon, PL4 8AA, England
| |
Collapse
|
13
|
Napper IE, Bakir A, Rowland SJ, Thompson RC. Characterisation, quantity and sorptive properties of microplastics extracted from cosmetics. Mar Pollut Bull 2015; 99:178-85. [PMID: 26234612 DOI: 10.1016/j.marpolbul.2015.07.029] [Citation(s) in RCA: 370] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 07/09/2015] [Accepted: 07/13/2015] [Indexed: 05/04/2023]
Abstract
Cosmetic products, such as facial scrubs, have been identified as potentially important primary sources of microplastics to the marine environment. This study characterises, quantifies and then investigates the sorptive properties of plastic microbeads that are used as exfoliants in cosmetics. Polyethylene microbeads were extracted from several products, and shown to have a wide size range (mean diameters between 164 and 327 μm). We estimated that between 4594 and 94,500 microbeads could be released in a single use. To examine the potential for microbeads to accumulate and transport chemicals they were exposed to a binary mixture of (3)H-phenanthrene and (14)C-DDT in seawater. The potential for transport of sorbed chemicals by microbeads was broadly similar to that of polythene (PE) particles used in previous sorption studies. In conclusion, cosmetic exfoliants are a potentially important, yet preventable source of microplastic contamination in the marine environment.
Collapse
Affiliation(s)
- Imogen E Napper
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom.
| | - Adil Bakir
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom; Petroleum and Environmental Geochemistry Group (PEGG), School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom
| | - Steven J Rowland
- Petroleum and Environmental Geochemistry Group (PEGG), School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom
| | - Richard C Thompson
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom
| |
Collapse
|
14
|
Abstract
Cosmetic products, such as facial scrubs, have been identified as potentially important primary sources of microplastics to the marine environment. This study characterises, quantifies and then investigates the sorptive properties of plastic microbeads that are used as exfoliants in cosmetics. Polyethylene microbeads were extracted from several products, and shown to have a wide size range (mean diameters between 164 and 327 μm). We estimated that between 4594 and 94,500 microbeads could be released in a single use. To examine the potential for microbeads to accumulate and transport chemicals they were exposed to a binary mixture of (3)H-phenanthrene and (14)C-DDT in seawater. The potential for transport of sorbed chemicals by microbeads was broadly similar to that of polythene (PE) particles used in previous sorption studies. In conclusion, cosmetic exfoliants are a potentially important, yet preventable source of microplastic contamination in the marine environment.
Collapse
Affiliation(s)
- Imogen E Napper
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom.
| | - Adil Bakir
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom; Petroleum and Environmental Geochemistry Group (PEGG), School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom
| | - Steven J Rowland
- Petroleum and Environmental Geochemistry Group (PEGG), School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom
| | - Richard C Thompson
- Marine Biology and Ecology Research Centre (MBERC), School of Marine Science and Engineering, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, United Kingdom
| |
Collapse
|