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Screening the Efficacy of a Microbial Consortium of Bacteria and Fungi Isolated from Different Environmental Samples for the Degradation of LDPE/TPS Films. SEPARATIONS 2023. [DOI: 10.3390/separations10020079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
In this study, a screening of the efficacy of a microbial consortium of bacteria and fungi isolated from activated sludge, river sediment, and compost for the degradation of LDPE/TPS was performed. According to the morphological and biochemical characterization, eight bacteria, Bacillus sonorensis, Bacillus subtilis, Lysinibacillus massiliensis, Bacillus licheniformis, Bacillus indicus, Bacillus megaterium, Bacillus cereus, and Pseudomonas alcaligenes, five molds, Aspergillus sp. 1, Aspergillus sp. 2, Trichoderma sp., Rhizopus sp., Penicillium sp., and Alternaria sp., and a yeast, Candida parapsilosis, were identified. The first experiment E1 was inoculated with microorganisms isolated from activated sludge and river sediment, and E2 with microorganisms isolated from compost. In both experiments, different types of polymeric materials, low density polyethylene (E1-1 and E2-1), thermoplastic starch (E1-2 and E2-2), low density polyethylene + thermoplastic starch (E1-3 and E2-3), low density polyethylene + thermoplastic starch + styrene-ethylene-styrene (E1-4 and E2-4) were added. The obtained results, weight loss, SEM, and FTIR analysis showed that the microorganisms in both experiments were able to degrade polymeric materials. The mixed culture of microorganisms in experiments E1-2 and E2-2 completely degraded TPS (thermoplastic starch). The percent weight losses of LDPE, LDPE+20% TPS, and LDPE+20% TPS+SEBS in experiment E1 were 3.3184%, 14.1152%, and 16.0062% and in experiment E2 were 3.9625%, 20.4520% and 21.9277%, respectively. SEM microscopy shows that the samples with a LDPE matrix exhibited moderate surface degradation and negligible oxidative degradation under the given conditions. FTIR/ATR data demonstrate that degradation was more intense in E2 than in E1.
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Saha S, Shukla SK, Singh HR, Pradhan KK, Jha SK. Production and purification of bioflocculants from newly isolated bacterial species: a comparative decolourization study of cationic and anionic textile dyes. ENVIRONMENTAL TECHNOLOGY 2021; 42:3663-3674. [PMID: 32114960 DOI: 10.1080/09593330.2020.1737737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 02/26/2020] [Indexed: 06/10/2023]
Abstract
Bioflocculant-producing bacteria were isolated from various water reservoirs and sediments of the water treatment plant. Four promising strains were identified by standard biochemical methods and 16s rRNA gene sequencing. Bioflocculants were produced in a batch bioreactor of 3 L under optimized conditions. Fourier transformed infrared spectroscopy and scanning electron microscopy (SEM) were used to confirm the chemical and morphological nature of bioflocculants. Anionic and cationic textile dyes congo red (CR) and rhodamine-B (RB) decolourization efficiency by ethanol precipitated bioflocculants were accessed under different values of pH, temperature, dose of flocculant and presence of monovalent, divalent and trivalent cations. Bioflocculants of all the four isolates were found to be highly efficient in decolourization of dye from an aqueous medium with the removal rate up to 99.56%. The removal rate of CR and RB from aqueous medium was largely influenced by the physiochemical condition of the solution viz. pH, temperature, concentration of ions and dose of flocculants. The microbial bioflocculants are biodegradable and highly stable as well as possess abroad range of pH, temperature and ions tolerance range. So, they may be economical and can be greener substitutes for the present harsh chemical-based wastewater effluent treatment methods.
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Affiliation(s)
- Swastika Saha
- Department of Bioengineering, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
| | - Sushil Kumar Shukla
- Department of Transport Science and Technology, Central University of Jharkhand, Brambe, Ranchi, Jharkhand, India
| | - Hare Ram Singh
- Department of Bioengineering, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
| | - Kishanta Kumar Pradhan
- Department of Pharmaceutical Science and Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
| | - Santosh Kumar Jha
- Department of Bioengineering, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
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Elmansour TE, Mandi L, Ahmali A, Elghadraoui A, Aziz F, Hejjaj A, Del Bubba M, Ouazzani N. Effect of polyphenols on activated sludge biomass during the treatment of highly diluted olive mill wastewaters: biomass dynamics and purifying performances. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:1416-1429. [PMID: 33079720 DOI: 10.2166/wst.2020.423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This study aims to investigate the feasibility of treating olive mill waste water (OMWW) by activated sludge pilot (AS) after its high dilution (1%) by urban waste water (UWW) and to study the effect of polyphenol compounds on the biomass during the treatment. Specific oxygen uptake rate (SOUR), mixed liquor volatile suspended solids (MLVSS), chemical oxygen demand (COD) and total polyphenols, were followed up over 100 days. In spite of the polyphenols' high concentration (up to 128 mg·L-1), successful biomass growth of 7.12 g MLVSS.L -1 and activity were achieved. Most of the bacteria (Pseudomonas sp., Klebsiella oxytoca, Citrobacter fereundii, Escherichia coli and Staphylococcus sp.) and fungi (Trichoderma sp., Rhizopus sp., Aspergillus niger, Penicillium sp., Fusarium sp., Alternaria) identified in the aerobic basin during the stabilization stage were known to be resistant to OMWW and showed effective adaptation of the biomass to polyphenols in high concentration. COD and polyphenols were highly eliminated (90%, 92% respectively). The sludge volume index in the pilot settling tank was almost constant at around 120 mL.g -1. This suggests the possibility of managing OMWW by simple injection at a given percentage in already functioning conventional AS treating UWW.
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Affiliation(s)
- T E Elmansour
- National Center for Studies and Research on Water and Energy (CNEREE), Cadi Ayyad University, Marrakech, Morocco E-mail: ; Laboratory of Water, biodiversity and Climate change, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco
| | - L Mandi
- National Center for Studies and Research on Water and Energy (CNEREE), Cadi Ayyad University, Marrakech, Morocco E-mail: ; Laboratory of Water, biodiversity and Climate change, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco
| | - A Ahmali
- National Center for Studies and Research on Water and Energy (CNEREE), Cadi Ayyad University, Marrakech, Morocco E-mail: ; Laboratory of Water, biodiversity and Climate change, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco
| | - A Elghadraoui
- National Center for Studies and Research on Water and Energy (CNEREE), Cadi Ayyad University, Marrakech, Morocco E-mail: ; Laboratory of Water, biodiversity and Climate change, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco
| | - F Aziz
- National Center for Studies and Research on Water and Energy (CNEREE), Cadi Ayyad University, Marrakech, Morocco E-mail: ; Laboratory of Water, biodiversity and Climate change, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco; Faculty Polydisciplinary of Safi, University Cadi Ayyad, Marrakech, Morocco
| | - A Hejjaj
- National Center for Studies and Research on Water and Energy (CNEREE), Cadi Ayyad University, Marrakech, Morocco E-mail:
| | - M Del Bubba
- Department of Chemistry, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
| | - N Ouazzani
- National Center for Studies and Research on Water and Energy (CNEREE), Cadi Ayyad University, Marrakech, Morocco E-mail: ; Laboratory of Water, biodiversity and Climate change, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco
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Casimicrobium huifangae gen. nov., sp. nov., a Ubiquitous "Most-Wanted" Core Bacterial Taxon from Municipal Wastewater Treatment Plants. Appl Environ Microbiol 2020; 86:AEM.02209-19. [PMID: 31811031 DOI: 10.1128/aem.02209-19] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 11/22/2019] [Indexed: 11/20/2022] Open
Abstract
Microorganisms in wastewater treatment plants (WWTPs) play a key role in the removal of pollutants from municipal and industrial wastewaters. A recent study estimated that activated sludge from global municipal WWTPs harbors 1 × 109 to 2 × 109 microbial species, the majority of which have not yet been cultivated, and 28 core taxa were identified as "most-wanted" ones (L. Wu, D. Ning, B. Zhang, Y. Li, et al., Nat Microbiol 4:1183-1195, 2019, https://doi.org/10.1038/s41564-019-0426-5). Cultivation and characterization of the "most-wanted" core bacteria are critical to understand their genetic, physiological, phylogenetic, and ecological traits, as well as to improve the performance of WWTPs. In this study, we isolated a bacterial strain, designated SJ-1, that represents a novel cluster within Betaproteobacteria and corresponds to OTU_16 within the 28 core taxa in the "most-wanted" list. Strain SJ-1 was identified and nominated as Casimicrobium huifangae gen. nov., sp. nov., of a novel family, Casimicrobiaceae. C. huifangae is ubiquitously distributed and is metabolically versatile. In addition to mineralizing various carbon sources (including carbohydrates, aromatic compounds, and short-chain fatty acids), C. huifangae is capable of nitrate reduction and phosphorus accumulation. The population of C. huifangae accounted for more than 1% of the bacterial population of the activated sludge microbiome from the Qinghe WWTP, which showed seasonal dynamic changes. Cooccurrence analysis suggested that C. huifangae was an important module hub in the bacterial network of Qinghe WWTP.IMPORTANCE The activated sludge process is the most widely applied biotechnology and is one of the best ecosystems to address microbial ecological principles. Yet, the cultivation of core bacteria and the exploration of their physiology and ecology are limited. In this study, the core and novel bacterial taxon C. huifangae was cultivated and characterized. This study revealed that C. huifangae functioned as an important module hub in the activated sludge microbiome, and it potentially plays an important role in municipal wastewater treatment plants.
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El Moussaoui T, Jaouad Y, Mandi L, Marrot B, Ouazzani N. Biomass behaviour in a conventional activated sludge system treating olive mill wastewater. ENVIRONMENTAL TECHNOLOGY 2018; 39:190-202. [PMID: 28276836 DOI: 10.1080/09593330.2017.1296899] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 02/14/2017] [Indexed: 06/06/2023]
Abstract
The current work aims to study the biomass behaviour in a continuous mode activated sludge system (ASS) treating olive mill wastewater (OMWW) through an increasing OMWW food to microorganism ration (F/M). To this end, the biomass growth, the specific oxygen uptake rate (SOUR), microbial characterization, sludge volume index (SVI) as well as COD and phenolic compounds removal efficiencies were examined over time. Results showed a successful growth of the biomass that reached 6.79 gTSS l-1 and 5.42 gVSS l-1. Its viability, its adaptability, and its good physiological activity were confirmed by the obtained result of SOUR with an average of 9.95 mgO2 gVSS-1h-1, as well as aerobic microbial population characterization in terms of aerobic revivable bacteria at 22°C and 37°C, Pseudomonas sp., mould and yeast and total fungi. The concentration of these strains characterized by their ability to degrade effectively COD and phenolic compounds increased significantly (p < .05) over time. This demonstrated a great promptness in response to the increasing OMWW mass ratio. For all treatment steps, removal efficiencies were high and reached 95% of COD and 93% of phenolic compounds, also the flocs settleability shown by SVI measurement was optimal.
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Affiliation(s)
- Tawfik El Moussaoui
- a Laboratory of Hydrobiology Ecotoxicology and Sanitation LHEA URAC 33 , University Cadi Ayyad , Marrakech , Morocco
- b National Center for Studies and Research on Water and Energy (CNEREE), BP/511 , University Cadi Ayyad , Marrakech , Morocco
| | - Yasamine Jaouad
- a Laboratory of Hydrobiology Ecotoxicology and Sanitation LHEA URAC 33 , University Cadi Ayyad , Marrakech , Morocco
- b National Center for Studies and Research on Water and Energy (CNEREE), BP/511 , University Cadi Ayyad , Marrakech , Morocco
| | - Laila Mandi
- a Laboratory of Hydrobiology Ecotoxicology and Sanitation LHEA URAC 33 , University Cadi Ayyad , Marrakech , Morocco
- b National Center for Studies and Research on Water and Energy (CNEREE), BP/511 , University Cadi Ayyad , Marrakech , Morocco
| | - Benoît Marrot
- c Aix-Marseille Université, CNRS, Centrale Marseille , M2P2 UMR 7340, 13541 , Marseille , France
| | - Naaila Ouazzani
- a Laboratory of Hydrobiology Ecotoxicology and Sanitation LHEA URAC 33 , University Cadi Ayyad , Marrakech , Morocco
- b National Center for Studies and Research on Water and Energy (CNEREE), BP/511 , University Cadi Ayyad , Marrakech , Morocco
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Comparing salinities of 0, 10 and 20 in biofloc genetically improved farmed tilapia ( Oreochromis niloticus ) production systems. AQUACULTURE AND FISHERIES 2017. [DOI: 10.1016/j.aaf.2017.10.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Mondala AH, Hernandez R, French T, McFarland L, Santo Domingo JW, Meckes M, Ryu H, Iker B. Enhanced lipid and biodiesel production from glucose-fed activated sludge: Kinetics and microbial community analysis. AIChE J 2011. [DOI: 10.1002/aic.12655] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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EKASARI JULIE, CRAB ROSELIEN, VERSTRAETE WILLY. Primary Nutritional Content of Bio-Flocs Cultured with Different Organic Carbon Sources and Salinity. HAYATI JOURNAL OF BIOSCIENCES 2010. [DOI: 10.4308/hjb.17.3.125] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Barnabé S, Brar SK, Tyagi RD, Beauchesne I, Surampalli RY. Pre-treatment and bioconversion of wastewater sludge to value-added products--fate of endocrine disrupting compounds. THE SCIENCE OF THE TOTAL ENVIRONMENT 2009; 407:1471-88. [PMID: 19110297 DOI: 10.1016/j.scitotenv.2008.11.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2008] [Revised: 10/25/2008] [Accepted: 11/09/2008] [Indexed: 05/05/2023]
Abstract
Development of processes for the production of value added products (VAPs), such as biopesticides, microbial inoculants or industrial enzymes through biotransformation of raw or pre-treated wastewater sludge (WWS) has undergone a substantial progress over the last decade. WWS based VAPs are low cost biological alternatives that can compete with chemicals or other cost intensive biological products in the current markets. However, when WWS is used as a raw material for VAPs production, questions still remains on the persistence of organic pollutants within the biotransformed WWS, especially, endocrine disrupting compounds (EDCs) and the production of their toxic intermediates. WWS pre-treatment prior to biotransformation as well as the microbial strains used for biotransformation can possibly remove these organic pollutants. The literature findings concerning the impact of WWS pre-treatment and value added products on EDCs removal are reviewed in this paper. The microbial potential to degrade or detoxify EDCs and toxic intermediates concomitant with value-addition is also discussed. The concept of obtaining EDCs free-WWS based VAPs and simultaneously achieving the objective of pollution control is presented.
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Affiliation(s)
- S Barnabé
- Institut National de la Recherche Scientifique, Université du Québec, 490 rue de la Couronne, Québec, Québec, Canada G1K 9A9
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Subramanian SB, Yan S, Tyagi RD, Surampalli RY, Lohani BN. Isolation and molecular identification of extracellular polymeric substances (EPS) producing bacterial strains for sludge settling and dewatering. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2008; 43:1495-1503. [PMID: 18821234 DOI: 10.1080/10934520802293602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
One of the major problems in overall wastewater treatment process is sludge settling and dewatering. In general, sludge settling and dewatering is carried out using conventional physico-chemical methods that are known to be expensive, and these processes further increase the sludge volume and ultimate disposal costs. To overcome this problem, a suitable alternative could be the use of bioflocculants for sludge settling and dewatering. To achieve bioflocculation, extracellular polymeric substances (EPS) producing bacterial strains were isolated from the complex microbial community of wastewater sludge. Crude EPS produced in the form of bacterial broth was used to test kaolin flocculation activity. Three out of 10 bacterial strains (B2, B8 and B9) were pre-selected for sludge settling. Based on sludge settling and dewatering results, B8 possessed better flocculating property than other bacterial strains. These sludge microorganisms were identified based on their 16S rDNA sequences and bacterial strain B8 was identified as Serratia sps.
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