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2006-1-1 · Phanerochaete chrysosporium was introduced into biodegradation of polyacrylamide(PAM), and effects of glucose amount, pH, N concentration, Mn2+ concentration and biodegradation time on biodegradation of PAM were studied. Results show that Phanerochaete chrysosporium has special abilities of enzyme catalysis biodegradation of PAM.
Get Price2019-5-18 · Hydrolyzed polyacrylamide (HPAM) is the most widely used water-soluble linear polymer with high molecular weight in polymer flooding. Microbiological degradation is an environment-friendly and effective method of treating HPAM-containing oilfield produced water.
Get Price2017-5-4 · Although polyacrylamide (PAM) and its derivatives have many useful applications, their release in nature can have impacts on the environment and human health, thus bioremediation approaches for residual PAM are urgently needed. Biodegradation of PAM and its derivatives has been studied only in the last two decades, with most emphasis on acrylamide biodegradation.
Get Price2014-3-1 · Polyacrylamide (PAM) used in sludge dewatering widely exists in high-solid anaerobic digestion. Degradation of polyacrylamide accompanied with accumulation of its toxic monomer is important to disposition of biogas residues. The potential of anaerobic digestion activity in microbial utilization of PAM was investigated in this study.
Get Price2018-9-7 · Wen, Q., Chen, Z., Zhao, Y., Zhang, H. & Feng, Y. Biodegradation of polyacrylamide by bacteria isolated from activated sludge and oil-contaminated soil. J. Hazard Mater. 175 , 955–959 (2010).
Get Price2021-7-13 · PAM can be also subject of biodegradation, photodegradation and 22 mechanical degradation but most of the studies report slow degradation rates without AMD release. In 23 the contrary, the adsorption of acrylamide onto particles is very low, which could favor its transfer in 24 surface waters and ground water. However AMD transfer is likely to be limited by quick microbial
Get Price2014-2-1 · Finally, the biodegradation performance of PAM in a high-solid anaerobic digestion for dewatered sludge was also studied. 2. Methods2.1. Determination of PAM biodegradation by biochemical methane potential (BMP) tests. The BMP test was conducted using the method of Owen et al. (1979) with a few modifications.
Get PriceBiodegradation of HPAM is a potentially promising strategy for deal … The increasing usage of partially hydrolyzed polyacrylamide (HPAM) in oilfields as a flooding agent to enhance oil recovery at so large quantities is an ecological hazard to the subsurface ecosystem due to persistence and inertness.
Get PriceBiodegradation of polyacrylamide begins with amidase catalysed deamination of polyacrylamide to ammonia and polyacrylate. The liberated ammonia is then used as a nitrogen source for growth by the microbes. The carbon backbone, polyacrylate, is more recalcitrant to biodegradation …
Get Price2016-5-1 · The three-dimensional response surfaces for the degradation of HPAM, shown in Fig. 2, were determined by holding one factor constant at zero and varying two factors.The results in Fig. 2a–c showed that effective HPAM degradation can occur when it is operated at the following conditions: pH of 7–9, concentration of glucose of 0–0.2 g/L and T of 20–40 °C.
Get PricePhanerochaete chrysosporium was introduced into biodegradation of polyacrylamide(PAM), and effects of glucose amount, pH, N concentration, Mn2+ concentration and biodegradation time on biodegradation of PAM were studied. Results show that Phanerochaete chrysosporium has special abilities of enzyme c …
Get PriceBiodegradation of polyacrylamide begins with amidase catalysed deamination of polyacrylamide to ammonia and polyacrylate. The liberated ammonia is then used as a nitrogen source for growth by the microbes. The carbon backbone, polyacrylate, is more recalcitrant to biodegradation …
Get PricePolyacrylamide (PAM), a linear water soluble polymeric compound with high molecular weight, is extensively used for oil production in China. Compared with the physico-chemical degradation of PAM, there is no acrylamide monomer, which causes peripheral neuropathy, released in the process of biodegradation. Unfortunately, few microorganisms have been isolated which can degrade PAM.
Get Price2014-2-1 · 1. Introduction. Anaerobic digestion (AD) by converting a part of its organic matter into biogas is an effective biomass valorization technology (Meester et al., 2012, Francioso et al., 2010).Recently, high-solid anaerobic processes are attractive for the advantages of smaller reactor volume, lower energy requirements for heating, and less material handling (Duan et al., 2012, Domenec, 2009 ...
Get Price2021-7-13 · 1 Title: Transfer and degradation of polyacrylamide based flocculants in hydrosystems: a review 2 3 Authors: A. G. Guezennec1, C. Michel1, K.Bru1, S. Touze1, N. Desroche2, I. Mnif3, M. Motelica-Heino4 4 1 BRGM 5 2 Nexidia SAS, 15 Rue de Mayence 21000 DIJON France 36 Université de Nice 7 4 ISTO, UMR 7327 CNRS-Université d’Orléans, 1A rue de la Férollerie, 45071 Orléans cedex 2
Get Price2018-10-2 · The hydrogel compositions were prepared on the basis of 5 types of strongly swelling polymers: №1—acryl hydrophilic Aquasorb preparation (France) with high degree of swelling (HDS) in pure water (700–1000 gH 2 O/g); №2—radiation-cross-linked technical polyacrylamide, synthesized in Institute of Chemical Physics of the Russian Academy ...
Get Price2009-8-6 · PREMRAJ & DOBLE: BIODEGRADATION OF POLYMERS 189 water-soluble polymers, such as polyacrylamide and polyacrylic acid. Among the vinyl polymers produced industrially, PVA is the only one known to be mineralized by microorganisms. PVA is water-soluble and biodegradable and hence, used to make water-soluble and biodegradable carriers, which may be
Get PricePartially hydrolyzed polyacrylamide (HPAM) in production water after polymer flooding in oil filed causes environmental problems, such as increases the difficulty in oil-water separation, degrades naturally to produce toxic acrylamide and endanger local ecosystem. Biodegradation of HPAM may be an efficient way to solve these problems. The biodegradability of HPAM in an aerobic environment was ...
Get PriceBiodegradation of two superabsorbent polymers, a crosslinked, insoluble polyacrylate and an insoluble polyacrylate polyacrylamide copolymer, in soil by the white-rot fungus,
Get Price2001-5-16 · Electrophoretic channels are filled with a polymer matrix prior to their use in DNA separations. This process, called gel-loading, can be accomplished manually, using syringes, or can be automated through the use of small pumps or vacuum. The injection rate is constrained by the desire to minimize shear-induced degradation of the polymer molecules. Currently, the community lacks …
Get PriceBiodegradation of polyacrylamide begins with amidase catalysed deamination of polyacrylamide to ammonia and polyacrylate. The liberated ammonia is then used as a nitrogen source for growth by the microbes. The carbon backbone, polyacrylate, is more recalcitrant to biodegradation …
Get PriceAbstract Hydrolyzed polyacrylamide (HPAM), which is extensively used for oil extraction in an oilfield, produces waste water that enters the groundwater system posing a threat to the safety of plants and animals. Among the many methods to removal the HPAM, the biodegradation based screened bacteria and sludge is an efficient method. Combined anaerobic and aerobic biological processes were used ...
Get Price2016-5-1 · The three-dimensional response surfaces for the degradation of HPAM, shown in Fig. 2, were determined by holding one factor constant at zero and varying two factors.The results in Fig. 2a–c showed that effective HPAM degradation can occur when it is operated at the following conditions: pH of 7–9, concentration of glucose of 0–0.2 g/L and T of 20–40 °C.
Get PricePartially hydrolyzed polyacrylamide (HPAM) in production water after polymer flooding in oil filed causes environmental problems, such as increases the difficulty in oil-water separation, degrades naturally to produce toxic acrylamide and endanger local ecosystem. Biodegradation of HPAM may be an efficient way to solve these problems. The biodegradability of HPAM in an aerobic environment was...
Get Price2001-5-16 · Electrophoretic channels are filled with a polymer matrix prior to their use in DNA separations. This process, called gel-loading, can be accomplished manually, using syringes, or can be automated through the use of small pumps or vacuum. The injection rate is constrained by the desire to minimize shear-induced degradation of the polymer molecules. Currently, the community lacks …
Get PriceThe wide application of water-soluble linear polyacrylamides (PAMs) can cause serious environmental pollution. Biological treatment of PAMs receives very limited efficiency due to their recalcitrance to the microbial degradation. Here, we show the bioelectrochemical system (BES) can be used as an effective strategy to improve the biodegradation efficiency of PAMs.
Get Price2014-9-26 · The aim of this review was to summarize information and scientific data from the literature dedicated to the fate of polyacrylamide (PAM)-based flocculants in hydrosystems. Flocculants, usually composed of PAMs, are widely used in several industrial fields, particularly in minerals extraction, to enhance solid/liquid separation in water containing suspended matter.
Get Price2021-3-12 · In this work, four immobilized kinds of mixed microorganisms were prepared by uploading oil-degradation bacteria into the cross-linked biodegradable polyacrylamide and sodium alginate mixture supporting material, which were employed for efficient degradation of oily wastewater. The morphology of immobilized microbial pellets was characterized by scanning electron microscopy after 7d and 14d of ...
Get Price2019-5-26 · Polyacrylamides (PAMs) have wide application in many industries and in agriculture. Scientific research and industrial applications manifested a need for a method that can quantify substrate-borne PAM. The N-bromination method (a PAM analytical technique based on N-bromination of amide groups and spectrophotometric determination of the formed starch−triiodide complex), which was …
Get PriceHigh molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and friction reducer in both enhanced oil recovery and high volume hydraulic fracturing. These applications of PAM can result in significant environmental challenges, both in water management and in contamination ...
Get Price2001-5-16 · Electrophoretic channels are filled with a polymer matrix prior to their use in DNA separations. This process, called gel-loading, can be accomplished manually, using syringes, or can be automated through the use of small pumps or vacuum. The injection rate is constrained by the desire to minimize shear-induced degradation of the polymer molecules. Currently, the community lacks …
Get Price2014-9-6 · The wide application of water-soluble linear polyacrylamides (PAMs) can cause serious environmental pollution. Biological treatment of PAMs receives very limited efficiency due to their recalcitrance to the microbial degradation. Here, we show the bioelectrochemical system (BES) can be used as an effective strategy to improve the biodegradation efficiency of PAMs.
Get Price2021-1-11 · Acrylic polymers (AP) are a diverse group of materials with broad applications, frequent use, and increasing demand. Some of the most used AP are polyacrylamide, polyacrylic acid, polymethyl methacrylates, and polyacrylonitrile. Although no information for the production of all AP types is published, data for the most used AP is around 9 MT/year, which gives an idea of the amount of …
Get Price2014-9-26 · The aim of this review was to summarize information and scientific data from the literature dedicated to the fate of polyacrylamide (PAM)-based flocculants in hydrosystems. Flocculants, usually composed of PAMs, are widely used in several industrial fields, particularly in minerals extraction, to enhance solid/liquid separation in water containing suspended matter.
Get Price2021-4-23 · Three types of Zeolitic imidazolate framework-8 (ZIF-8 s), i. e. ZIF-8(MeOH), ZIF-8(H 2 O), and ZIF-8(NH 3. H 2 O), were synthesized by using different solvents. Influences of the ZIF-8 type, hydrolyzed polyacrylamide (HPAM) property, and salinity of …
Get PriceBiodegradation of Industrial Oil-Polluted Wastewater in Egypt by Bacterial Consortium Immobilized in Different Types of Carriers Aliaa M. El-Borai1*, Khaled M. Eltayeb2, Alaa R. Mostafa2, Samy A. El-Assar1 1Botany and Microbiology Department, Faculty of Science, Alexandria University, Egypt
Get Price2019-2-6 · Microbial communities are more effective in degrading natural polymers and xenobiotics than pure cultures. Biodegradation of polyacrylic and polyurethane polymers by bacterial and fungal strains has been addressed, but limited information about their biodegradation by microbial communities exists. The aim of this work was to evaluate the ability of three enriched microbial communities (BP1h ...
Get Price1991-4-1 · Immobilization of the surfactant- degrading bacterium Pseudomonas C12B in polyacrylamide gel. III. Biodegradation specificity for raw surfactants and industrial wastes Owen R. T. Thomas and Graham F. White Department of Biochemistry, University of Wales College of Cardiff, Cardiff, UK The surfactant-degrading bacterium Pseudomonas CI2B was immobilized in polyacrylamide gel beads …
Get PriceThe microbial degradation of carbamates. Microbial technology is an effective and sustainable system for pesticide degradation in agricultural and industrial fields due to its ability to complete the mineralization of pollutants with economic benefits ( Fang et al., 2018; Parte et al., 2017; Khan et al., 2016 ).
Get Price2012-11-22 · adsorption to soil particles and biodegradation). Table 3.1 Summary of PECs for acrylamide Scenario PECwater (µg/l) PECair (mg/m3) Acrylamide production (including polyacrylamide production) 0.05-<10 7.6.10-6-2.3 .10-6 Polyacrylamide use as a coagulant and flocculent in …
Get Price2021-1-29 · the most used AP are polyacrylamide, polyacrylic acid, polymethyl methacrylates, and polyacrylonitrile. Although no informa-tion for the production of all AP types is published, data for the most used AP is around 9 MT/year, which gives an idea of the ... biodegradation, displayed by bacteria and fungi, and the bio-
Get Price2021-1-11 · 3 The types of microorganisms that are present to biodegrade the material are also influenced by these factors. Biodegradation is monitored by measuring the formation of carbon dioxide during the biodegradation process of the material. 4 Some countries, like Belgium, even prohibit by law to use the term “biodegradable” on a product.
Get Price2021-1-11 · Acrylic polymers (AP) are a diverse group of materials with broad applications, frequent use, and increasing demand. Some of the most used AP are polyacrylamide, polyacrylic acid, polymethyl methacrylates, and polyacrylonitrile. Although no information for the production of all AP types is published, data for the most used AP is around 9 MT/year, which gives an idea of the amount of …
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Get Price2016-7-1 · Since degradation of polyacrylamide accompanied with accumulation of its toxic monomer is important to the disposition of biogas residues generically termed as “digestate” (Chu et al., 2003, Zhang et al., 2009, Duan et al., 2012,) biodegradation of polyacrylamide by anaerobic digestion under mesophilic conditions in a dewatered sludge ...
Get Price2.3. Identification of bacterial strains. Twenty single colonies were obtained from four bacterial cultures (Fig. 1A (A-F), indicating the sampling sites) by streaking onto NB agar plates (3.0 g beef extract, 5.0 g peptone, and 15.0 g agar in 1 L of H 2 O, pH 6.8).Genomic DNA from each single colony was extracted using a HiGene™ Genomic DNA Prep Kit (Biofact, Daejeon, South Korea).
Get PriceMicrobial technology is an effective and sustainable system for pesticide degradation in agricultural and industrial fields due to its ability to complete the mineralization of pollutants with economic benefits (Fang et al., 2018; Parte et al., 2017; Khan et al., 2016).The major routes of the microbial degradation of carbamate compounds are hydrolysis and oxidation (Gupta et al., 2019; Jiang ...
Get Price2015-10-12 · Polyacrylamide (PAM) Description of Desired Solution: A SpecialChem Client is seeking biodegradable polymer solutions as replacements for current non-readily biodegradable acrylamide based polymer technologies. The key focus would be a replacement or modifications of acrylamide based polymer structure (PAM) and copolymer systems (PAMs).
Get Price2018-5-18 · Cationic polyacrylamide copolymers (PAMs) are used for sludge dewatering in municipal waste water treatment and might enter the environment by spreading of the sludge on agricultural land. Concern has been expressed since little is known about the degradation of PAMs in soils. To obtain detailed information on the polymer’s fate in the soil compartment, the degradation of 14C …
Get Price2012-7-22 · Polyacrylamide Emulsions Handbook 2-2 Storage and handling of emulsions : basic principles Emulsions must be stored inside a building at a constant temperature between 5°C and 30°C. During the storage and handling, the emulsion must not be contaminated by water.
Get PriceBiodegradable plastics have a specific role to play in reducing the accumulation of plastics in the environment. Replacing conventional plastic with biodegradable plastic can help with applications in the open environment — such as agriculture and fisheries, or plastics in fireworks — and where it is difficult or expensive to remove it from ...
Get Price2006-2-24 · new microorganisms for biodegradation, the discovery of new degradation enzymes, and the cloning of genes for synthetic polymer-degrading enzymes. Addresses Department of Biotechnology, Faculty of Engineering, Tottori University, Tottori 680-8552, Japan; e-mail: [email protected] Current Opinion in Biotechnology 2001, 12:242–247
Get Price2018-5-29 · • There are literally thousands of different types of polymers. ... POLYACRYLAMIDE (1703D) HMW 1.00% 18 20 20 21 25 20.8 170.7 Grams POLYACRYLAMIDE (1703D) HMW 1.50% 42 39 42 40 40 40.6 333.1 Grams ... • Accelerated biodegradation of natural ...
Get Price2021-1-1 · bacteria for polycyclic aromatic biodegradation of hydrocarbons in sea sponges from Spermonde Islands, Indonesia ... several types of bacteria are symbiotic with sponges and not all bacteria that are ... paraffin, deoxynucleoside triphosphate, polyacrylamide gels, agarose, ethidium bromide p.a., anthracene cas. no: 120-12-7, pyrene cas. no: 129 ...
Get Price2014-12-5 · environmental geochemistry: Differentiation of fuel types, their sources and release time. Organic Geochemistry 27:289– 317. These two publications are important references in hydrocarbon forensics. If you want to do age dating or fingerprinting of gasoline releases, get your hands on these publications (plus mine, of course ).
Get Price2015-10-12 · Polyacrylamide (PAM) Description of Desired Solution: A SpecialChem Client is seeking biodegradable polymer solutions as replacements for current non-readily biodegradable acrylamide based polymer technologies. The key focus would be a replacement or modifications of acrylamide based polymer structure (PAM) and copolymer systems (PAMs).
Get Price2017-1-3 · Biodegradation Biodegradation is a chemical process in which materials are me-tabolised into water, carbon dioxide, and biomass with the help of microorganisms. The process of biodegradation depends on the environmental conditions, which influence it (e.g. temperature, in-oculum, humidity, etc.) and on the material or application itself. To
Get Price2016-8-15 · Polyurethane (PU) is widely used in many aspects of modern life because of its versatility and resistance. However, PU waste disposal generates large problems, since it is slowly degraded, there are limited recycling processes, and its destruction may generate toxic compounds. In this work, we isolated fungal strains able to grow in mineral medium with a polyester PU (PS-PU; Impranil DLN) or a ...
Get Price2020-12-17 · A strain that efficiently degraded methyl tert-butyl ether (MTBE) was obtained by initial selection on the recalcitrant compound tert-butyl alcohol (TBA). This strain, a gram-positive methylotrophic bacterium identified as Mycobacterium austroafricanum IFP 2012, was also able to degrade tert-amyl methyl ether and tert-amyl alcohol. Ethyl tert-butyl ether was weakly degraded. tert …
Get Price2021-4-23 · Europe. Soil contamination ... Biodegradation of persistent organic pollutants by enzymes. Biotransformation of PTEs in less toxic forms, bioaccumulation, biorecovery. ... pH, soil types and other soil features) Contaminants (PTEs and/or organic pollutants): chemical nature and
Get PriceSince soil erosion is currently a worldwide threat, its control has become a necessity. The performance and effectiveness of synthetic organic polymers such polyacrylamide (PAM), have been intensively studied, especially for erosion control in temperate climate conditions. In tropical regions, however, where climatic conditions are usually severe, very little research has been conducted.
Get Price2019-7-31 · Microbial degradation following oil spills results in metabolites from the original oil. Metabolites are expected to display lower bioaccumulation potential and acute toxicity to marine organisms due to microbial-facilitated incorporation of chemical functional groups and a general decrease in lipophilicity. The toxicity and characterization of metabolites are poorly studied.
Get Price2020-3-20 · The results indicate that there was an occurrence of SWCNTs partial biodegradation in the murine peritoneal macrophages without any chemical stimulation. The mechanism of CNTs biodegradation was reported to relate with several peroxidases and reactive oxygen species (ROS) (Kagan et al., 2014; Yang et al., 2019). The results of ROS generation in ...
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