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López-Patiño AM, Cárdenas-Orrego A, Torres AF, Navarrete D, Champagne P, Ochoa-Herrera V. Native microalgal-bacterial consortia from the Ecuadorian Amazon region: an alternative to domestic wastewater treatment. Front Bioeng Biotechnol 2024; 12:1338547. [PMID: 38468686 PMCID: PMC10925762 DOI: 10.3389/fbioe.2024.1338547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 01/29/2024] [Indexed: 03/13/2024] Open
Abstract
In low-middle income countries (LMIC), wastewater treatment using native microalgal-bacterial consortia has emerged as a cost-effective and technologically-accessible remediation strategy. This study evaluated the effectiveness of six microalgal-bacterial consortia (MBC) from the Ecuadorian Amazon in removing organic matter and nutrients from non-sterilized domestic wastewater (NSWW) and sterilized domestic wastewater (SWW) samples. Microalgal-bacterial consortia growth, in NSWW was, on average, six times higher than in SWW. Removal rates (RR) for NH4 +- N and PO4 3--P were also higher in NSWW, averaging 8.04 ± 1.07 and 6.27 ± 0.66 mg L-1 d-1, respectively. However, the RR for NO3 - -N did not significantly differ between SWW and NSWW, and the RR for soluble COD slightly decreased under non-sterilized conditions (NSWW). Our results also show that NSWW and SWW samples were statistically different with respect to their nutrient concentration (NH4 +-N and PO4 3--P), organic matter content (total and soluble COD and BOD5), and physical-chemical parameters (pH, T, and EC). The enhanced growth performance of MBC in NSWW can be plausibly attributed to differences in nutrient and organic matter composition between NSWW and SWW. Additionally, a potential synergy between the autochthonous consortia present in NSWW and the native microalgal-bacterial consortia may contribute to this efficiency, contrasting with SWW where no active autochthonous consortia were observed. Finally, we also show that MBC from different localities exhibit clear differences in their ability to remove organic matter and nutrients from NSWW and SWW. Future research should focus on elucidating the taxonomic and functional profiles of microbial communities within the consortia, paving the way for a more comprehensive understanding of their potential applications in sustainable wastewater management.
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Affiliation(s)
- Amanda M. López-Patiño
- Colegio de Ciencias e Ingeniería, Universidad San Francisco de Quito USFQ, Quito, Ecuador
| | - Ana Cárdenas-Orrego
- Instituto de Microbiología, Universidad San Francisco de Quito USFQ, Quito, Ecuador
| | - Andrés F. Torres
- Colegio de Ciencias Biológicas y Ambientales, Universidad San Francisco de Quito USFQ, Quito, Ecuador
| | - Danny Navarrete
- Colegio de Ciencias e Ingeniería, Universidad San Francisco de Quito USFQ, Quito, Ecuador
| | - Pascale Champagne
- Department of Civil Engineering, Queen’s University, Kingston, ON, Canada
| | - Valeria Ochoa-Herrera
- Colegio de Ciencias e Ingeniería, Universidad San Francisco de Quito USFQ, Quito, Ecuador
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
- Escuela de Ingeniería, Ciencia y Tecnología, Universidad del Rosario, Bogotá, Colombia
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Chen B, Shen Y, Zhang X, Ji B. Influence mechanism of sludge bed position on microalgal-bacterial granular sludge process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:168118. [PMID: 37884157 DOI: 10.1016/j.scitotenv.2023.168118] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/16/2023] [Accepted: 10/23/2023] [Indexed: 10/28/2023]
Abstract
Sludge bed position in the reactor is one of the key parameters for microalgal-bacterial granular sludge (MBGS) process, which lacks of study. To fill this gap, this study investigated the influence of sludge bed position on MBGS. The sludge bed located closer to the bottom of the bioreactor demonstrated the optimal pollutant removal performance due to a close synergistic effect between microalgae and bacteria, resulting in the high growth rate as well as agglomeration rate of MBGS. Specifically, organics and ammonia removals were closely related to the sludge bed position. For the bottom bed position, the removals of organic matter, ammonia, and phosphate were 75.1 %, 73.1 %, and 82.5 %, whereas for the top bed position, they were only 13.2 %, 9.6 %, and 68.9 %, respectively. Additionally, a significant correlation between the position of the sludge bed and the relative abundance of Rotifera (R2 = 0.931) and Chlorophyta (R2 = 0.733) was observed, while the microbial communities at the lower sludge bed positions underwent rapider succession. It can be inferred that that a sludge bed located closer to the bottom of the bioreactor ensures that the light source and substrate matrix are transmitted in the same direction, thereby resulting in a close synergistic effect between microalgae and bacteria for achieving the excellent performance of MBGS. These results can provide basis knowledge for engineering application of MBGS process.
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Affiliation(s)
- Bingheng Chen
- Department of Water and Wastewater Engineering, School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Yao Shen
- Department of Water and Wastewater Engineering, School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Xiaoyuan Zhang
- Engineering Laboratory of Low-Carbon Unconventional Water Resources Utilization and Water Quality Assurance, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Bin Ji
- Department of Water and Wastewater Engineering, School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China; Hubei Provincial Engineering Research Center of Urban Regeneration, Wuhan University of Science and Technology, Wuhan 430065, China.
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Carvalho VCF, Fradinho JC, Oehmen A, Reis MAM. Long term operation of a phototrophic biological nutrient removal system: Impact of CO 2 concentration and light exposure on process performance. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 334:117490. [PMID: 36801686 DOI: 10.1016/j.jenvman.2023.117490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 02/03/2023] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
The utilization of non-aerated microalgae-bacterial consortia for phototrophic biological nutrient removal (photo-BNR) has emerged as an alternative to conventional wastewater treatment. Photo-BNR systems are operated under transient illumination, with alternating dark-anaerobic, light-aerobic and dark-anoxic conditions. A deep understanding of the impact of operational parameters on the microbial consortium and respective nutrient removal efficiency in photo-BNR systems is required. The present study evaluates, for the first time, the long-term operation (260 days) of a photo-BNR system, fed with a COD:N:P mass ratio of 7.5:1:1, to understand its operational limitations. In particular, different CO2 concentrations in the feed (between 22 and 60 mg C/L of Na2CO3) and variations of light exposure (from 2.75 h to 5.25 h per 8 h cycle) were studied to determine their impact on key parameters, like oxygen production and availability of polyhydroxyalkanoates (PHA), on the performance of anoxic denitrification by polyphosphate accumulating organisms. Results indicate that oxygen production was more dependent on the light availability than on the CO2 concentration. Also, under operational conditions with a COD:Na2CO3 ratio of 8.3 mg COD/mg C and an average light availability of 5.4 ± 1.3 W h/g TSS, no internal PHA limitation was observed, and 95 ± 7%, 92 ± 5% and 86 ± 5% of removal efficiency could be achieved for phosphorus, ammonia and total nitrogen, respectively. 81 ± 1.7% of the ammonia was assimilated into the microbial biomass and 19 ± 1.7% was nitrified, showing that biomass assimilation was the main N removal mechanism taking place in the bioreactor. Overall, the photo-BNR system presented a good settling capacity (SVI ∼60 mL/g TSS) and was able to remove 38 ± 3.3 mg P/L and 33 ± 1.7 mg N/L, highlighting its potential for achieving wastewater treatment without the need of aeration.
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Affiliation(s)
- V C F Carvalho
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University of Lisbon, 2829-516, Caparica, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal
| | - J C Fradinho
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University of Lisbon, 2829-516, Caparica, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal.
| | - A Oehmen
- School of Chemical Engineering, University of Queensland, Brisbane, QLD, 4072, Australia
| | - M A M Reis
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University of Lisbon, 2829-516, Caparica, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal
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Nor FHM, Abdullah S, Ibrahim Z, Nor MHM, Osman MI, Al Farraj DA, AbdelGawwad MR, Kamyab H. Role of extremophilic Bacillus cereus KH1 and its lipopeptide in treatment of organic pollutant in wastewater. Bioprocess Biosyst Eng 2023; 46:381-391. [PMID: 35779113 DOI: 10.1007/s00449-022-02749-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 06/13/2022] [Indexed: 12/01/2022]
Abstract
An effective biosurfactant producer and extremophiles bacteria, Bacillus cereus KH1, was isolated from textile effluent and the biosurfactant was produced using molasses as the sole carbon source. Growth parameters such as pH, temperature, salinity and concentration of molasses were optimised for decolourising the textile effluent with 24-h incubation. The biosurfactant property of B. cereus KH1 was evaluated based on haemolytic activity, oil displacement technique, drop-collapsing test and emulsification index. The results of the produced biosurfactant showed a positive reaction in haemolytic activity, oil displacement technique, drop-collapsing test and exhibiting a 67% emulsification index. The cell-free broth was stable in 40 °C pH 7, 7% salinity and 7% molasses. Thin-Layer Chromatography and Fourier Transform Infrared Spectroscopy analysis revealed that the biosurfactant was a lipopeptide with a yield 2.98 g L-1. These findings proved the synergistic action of B. cereus KH1 with lipopeptide biosurfactant may accelerated the decolourisation efficiency to 87%.
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Affiliation(s)
- Farhah Husna Mohd Nor
- Department of Physics and Chemistry, Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, Pagoh Education Hub, Pagoh, 84600, Muar, Johor, Malaysia
| | - Shakila Abdullah
- Department of Physics and Chemistry, Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, Pagoh Education Hub, Pagoh, 84600, Muar, Johor, Malaysia.
| | - Zaharah Ibrahim
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Muhamad Hanif Md Nor
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Mohd Isa Osman
- Setia Impian Development, Peringgit Centre, Taman Peringgit Jaya, 75400, Melaka, Malaysia
| | - Dunia A Al Farraj
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Mohamed Ragab AbdelGawwad
- Genetics and Bioengineering, Faculty of Engineering and Natural Sciences, International University of Sarajevo, 71210, Sarajevo, Bosnia and Herzegovina
| | - Hesam Kamyab
- Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100, Kuala Lumpur, Malaysia
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Morán-Valencia M, Nishi K, Akizuki S, Ida J, Cuevas-Rodríguez G, Cervantes-Avilés P. Nitrogen removal from wastewater by an immobilized consortium of microalgae-bacteria in hybrid hydrogels. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 87:527-538. [PMID: 36789701 DOI: 10.2166/wst.2023.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The high content of nitrogen in wastewater brings some operational, technical, and economical issues in conventional technologies. The aim of this study was to evaluate the nitrogen removal by hybrid hydrogels containing consortium microalgae-nitrifying bacteria in the presence of activated carbon (AC) used as an adsorbent of inhibitory substances. Hybrid hydrogels were synthesized from polyvinyl alcohol (PVA), sodium alginate (SA), biomass (microalgae-nitrifying bacteria), and AC. The hybrid hydrogels were evaluated based on the change in ammonium (NH4), nitrate (NO3), and chemical demand of oxygen (COD) concentrations, nitrification rate, and other parameters during 72 h. Results indicated that NH4 removal was more effective for hydrogels without AC than with AC, without significant differences regarding consortium biomass concentration (5 or 16%), presenting final concentrations of 3.13 and 3.75 mg NH4/L for hydrogels with 5 and 16% of the biomass, respectively. Regarding NO3 production, hydrogels without AC reached concentrations of 25.9 and 39.77 mg NO3/L for 5 and 16% of the biomass, respectively, while treatments with AC ended with 2.17 and 1.37 mg NO3/L. This confirms that hydrogels can carry out the nitrification process and do not need AC to remove potential inhibitors. The best performance was observed for the hydrogel with 5% of biomass without AC with a nitrification rate of 0.43 mg N/g TSS·h.
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Affiliation(s)
- Marien Morán-Valencia
- Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey, Campus Puebla, Vía Atlixcáyotl 5718, Reserva Territorial Atlixcáyotl, Puebla, Puebla 72453, Mexico
| | - Kento Nishi
- Department of Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, Soka University, 1-236, Tangi-machi, Hachioji, Tokyo 192-8577, Japan
| | - Shinichi Akizuki
- Institute of Plankton Eco-Engineering, Soka University, 1-236, Tangi-machi, Hachioji, Tokyo 192-8577, Japan
| | - Junichi Ida
- Department of Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, Soka University, 1-236, Tangi-machi, Hachioji, Tokyo 192-8577, Japan
| | - Germán Cuevas-Rodríguez
- Department of Civil and Environmental Engineering, Engineering Division, University of Guanajuato, Av. Juárez 77, Zona Centro, Guanajuato Gto 36000, Mexico
| | - Pabel Cervantes-Avilés
- Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey, Campus Puebla, Vía Atlixcáyotl 5718, Reserva Territorial Atlixcáyotl, Puebla, Puebla 72453, Mexico
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Osabutey A, Haleem N, Uguz S, Min K, Samuel R, Albert K, Anderson G, Yang X. Growth of Scenedesmus dimorphus in swine wastewater with versus without solid-liquid separation pretreatment. BIORESOURCE TECHNOLOGY 2023; 369:128434. [PMID: 36473585 DOI: 10.1016/j.biortech.2022.128434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/26/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
Scenedesmus dimorphus was cultivated in raw and pretreated swine wastewater (SW) with 6-L photobioreactors (PBRs) to investigate the effect of solid-liquid separation on algal growth. The same aerated PBRs containing no algae were used as control. Moderate COD and nitrogen removal from the SW was achieved with the algal PBRs. However, compared to the control reactors, they offered no consistent treatment boost. Improved algal growth occurred in the pretreated SW, as measured by maximum algal cell count (3202 ± 275 × 106 versus 2286 ± 589 × 106 cells L-1) and cell size. The enhanced algal growth in the pretreated SW resulted in relatively high nitrogen (5.7 %) and organic matter contents in the solids harvested at the end of cultivation experiments, with ∼25.6 % of nitrogen in the SW retained in the solids and ∼9.1 % absorbed by algae. The pretreatment also resulted in elevated phosphorus removal. This study is anticipated to foster the development of microalgae-based SW treatment processes.
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Affiliation(s)
- Augustina Osabutey
- Department of Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD 57007, USA
| | - Noor Haleem
- Department of Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD 57007, USA; Institute of Environmental Sciences and Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan
| | - Seyit Uguz
- Biosystems Engineering, Faculty of Agriculture, Bursa Uludag University, Gorukle 16240, Bursa, Turkey
| | - Kyungnan Min
- Department of Civil and Environmental Engineering, South Dakota State University, Brookings, SD 57007, USA
| | - Ryan Samuel
- Department of Animal Science, South Dakota State University, Brookings, SD 57007, USA
| | - Karlee Albert
- Department of Biology & Microbiology, South Dakota State University, Brookings, SD 57007, USA
| | - Gary Anderson
- Department of Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD 57007, USA
| | - Xufei Yang
- Department of Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD 57007, USA.
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Oruganti RK, Katam K, Show PL, Gadhamshetty V, Upadhyayula VKK, Bhattacharyya D. A comprehensive review on the use of algal-bacterial systems for wastewater treatment with emphasis on nutrient and micropollutant removal. Bioengineered 2022; 13:10412-10453. [PMID: 35441582 PMCID: PMC9161886 DOI: 10.1080/21655979.2022.2056823] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 11/08/2022] Open
Abstract
The scarcity of water resources and environmental pollution have highlighted the need for sustainable wastewater treatment. Existing conventional treatment systems are energy-intensive and not always able to meet stringent disposal standards. Recently, algal-bacterial systems have emerged as environmentally friendly sustainable processes for wastewater treatment and resource recovery. The algal-bacterial systems work on the principle of the symbiotic relationship between algae and bacteria. This paper comprehensively discusses the most recent studies on algal-bacterial systems for wastewater treatment, factors affecting the treatment, and aspects of resource recovery from the biomass. The algal-bacterial interaction includes cell-to-cell communication, substrate exchange, and horizontal gene transfer. The quorum sensing (QS) molecules and their effects on algal-bacterial interactions are briefly discussed. The effect of the factors such as pH, temperature, C/N/P ratio, light intensity, and external aeration on the algal-bacterial systems have been discussed. An overview of the modeling aspects of algal-bacterial systems has been provided. The algal-bacterial systems have the potential for removing micropollutants because of the diverse possible interactions between algae-bacteria. The removal mechanisms of micropollutants - sorption, biodegradation, and photodegradation, have been reviewed. The harvesting methods and resource recovery aspects have been presented. The major challenges associated with algal-bacterial systems for real scale implementation and future perspectives have been discussed. Integrating wastewater treatment with the algal biorefinery concept reduces the overall waste component in a wastewater treatment system by converting the biomass into a useful product, resulting in a sustainable system that contributes to the circular bioeconomy.
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Affiliation(s)
- Raj Kumar Oruganti
- Department of Civil Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
| | - Keerthi Katam
- Department of Civil Engineering, École Centrale School of Engineering, Mahindra University, India
| | - Pau Loke Show
- Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham, Malaysia
| | - Venkataramana Gadhamshetty
- Civil and Environmental Engineering, South Dakota School of Mines and Technology, Rapid, South Dakota, USA
| | | | - Debraj Bhattacharyya
- Department of Civil Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
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A Review about Microalgae Wastewater Treatment for Bioremediation and Biomass Production—A New Challenge for Europe. ENVIRONMENTS 2021. [DOI: 10.3390/environments8120136] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Microalgae have received much attention in the last few years. Their use is being extended to different fields of application and technologies, such as food, animal feed, and production of valuable polymers. Additionally, there is interest in using microalgae for removal of nutrients from wastewater. Wastewater treatment with microalgae allows for a reduction in the main chemicals responsible for eutrophication (nitrogen and phosphate), the reduction of organic substrates (by decreasing parameters such as BOD and COD) and the removal of other substances such as heavy metals and pharmaceuticals. By selecting and reviewing 202 articles published in Scopus between 1992 and 2020, some aspects such as the feasibility of microalgae cultivation on wastewater and potential bioremediation have been investigated and evaluated. In this review, particular emphasis was placed on the different types of wastewaters on which the growth of microalgae is possible, the achievable bioremediation and the factors that make large-scale microalgae treatment feasible. The results indicated that the microalgae are able to grow on wastewater and carry out effective bioremediation. Furthermore, single-step treatment with mixotrophic microalgae could represent a valid alternative to conventional processes. The main bottlenecks are the large-scale feasibility and costs associated with biomass harvesting.
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