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2017-5-4 · Some fungi and yeasts could degrade 60–80% of acrylamide. The biodegradation of PAM and its derivatives are initiated by the enzyme amidase, either under aerobic or anaerobic conditions, and are further degraded partially or completely by an array of different enzymes.
Get Price2018-9-1 · Hydrolyzed polyacrylamide (HPAM) is widely used to EOR in many oilfields, and it is generally accepted as a nontoxic polymer. However, under certain physical or chemical conditions, it may degrade and produce acrylamide (AM), which exhibits toxicity to nervous system and damages human health seriously (Rayburn and Friedman, 2010).
Get Price2019-9-1 · Biodegradation of polyacrylamide by anaerobic digestion under mesophilic condition and its performance in actual dewatered sludge system
Get Price2016-3-29 · The special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)-containing wastewater that could use HPAM as the sole carbon source and nitrogen source. Through optimizing the condition of HPAM biodegradation, the removal rate of R2 free strain reached to 41.6% when pH was 7, temperature was 35°C, inoculation quantity (v/v) was 3% and activation time was 4.
Get Price2016-3-29 · The special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)-containing wastewater that could use HPAM as the sole carbon source and nitrogen source. Through optimizing the condition of HPAM biodegradation, the removal rate of R2 free strain reached to 41.6% when pH was 7, temperature was 35°C, inoculation quantity (v/v ...
Get Price2015-11-1 · 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.
Get Price2016-9-1 · The special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)‐containing wastewater that could use HPAM as the sole carbon source and nitrogen source. Through optimizing the condition of HPAM biodegradation, the removal rate of R2 free strain reached to 41.6% when pH was 7, temperature was 35°C, inoculation quantity (v/v) was 3% and activation time …
Get Price2018-9-7 · PAM used as a flocculant in water treatment or sludge dewatering is disposed in high-solid biogas digestors or landfills. 94 Although PAM is typically considered to be relatively recalcitrant to ...
Get Price2019-4-1 · 3. Polyacrylamide as a nitrogen source. Biodegradation of polyacrylamide begins with amidase catalysed deamination of polyacrylamide to ammonia and polyacrylate ( Fig. 1 ). The liberated ammonia is then utilized as a nitrogen source for growth by the microbes.
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 PriceThe special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)‐containing wastewater that could use HPAM as the sole carbon source and nitrogen source. Through optimizing the condition of HPAM biodegradation, the removal rate of R2 free strain reached to 41.6% when pH was 7, temperature was 35°C, inoculation quantity (v
Get PriceAlthough 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 Price2016-3-29 · The special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)-containing wastewater that could use HPAM as the sole carbon source and nitrogen source. Through optimizing the condition of HPAM biodegradation, the removal rate of R2 free strain reached to 41.6% when pH was 7, temperature was 35°C, inoculation quantity (v/v ...
Get PriceThe biodegradation of polyacrylamide (PAM) includes the hydrolysis of amino groups and cleavage of the carbon chain; however, the effect of molecular weight on the biodegradation needs further investigations. In this study, biodegradation of low molecular weight PAM (1.6 × 10 6 Da) was eva …
Get Price2019-5-18 · Biodegradation of hydrolyzed polyacrylamide by a Bacillus megaterium strain SZK-5: Functional enzymes and antioxidant defense mechanism. Tianwen Song Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education/Institute for Advanced Ocean Study, Ocean University of China, Qingdao, 266100, China; College of Chemistry and ...
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 Price2006-1-1 · 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 Price2018-3-26 · Biodegradation of HPAM by microbes may be an efficient way to solve those problems. Microbial biodegradation is considered an environmentally friendly safe technique. The isolation of microbes that are able to degrade HPAM from the oil field produced water was investigated in this study.
Get Price2018-5-1 · Biodegradation of hydrolyzed polyacrylamide by the combined expanded granular sludge bed reactor-aerobic biofilm reactor biosystem and key microorganisms involved in this bioprocess. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and ...
Get PriceWater-soluble polyacrylamide is commercially available in different domains of industry, such as water purified, paper making, pharmacy, agriculture and oil exploitation. Especially polyacrylamide is used for polymer displacement, which can enhance oil recovery through increasing the sweeping efficiency. Good economic effects are achieved by the industrial application of polymer in various oil ...
Get PriceAlthough 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 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 hydrolyzed polyacrylamide by a Bacillus megaterium strain SZK-5: Functional enzymes and antioxidant defense mechanism Song, Tianwen Li, Shanshan
Get PriceThe special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)-containing wastewater that could use HPAM as the sole carbon source and nitrogen source. Through optimizing the condition of HPAM biodegradation, the removal rate of R2 free strain reached to 41.6% when pH was 7, temperature was 35°C, inoculation quantity (v/v) was 3% and activation time was 4.
Get Price2006-1-1 · 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 Price2018-3-3 · 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. Biodegradation of HPAM is a potentially promising strategy for dealing with this problem among many other methods available.
Get PriceBiodegradation of polyacrylamide by anaerobic digestion under mesophilic condition and its performance in actual dewatered sludge system 喜欢 0 阅读量： 3 作者： Jing，Yi，Qunbiao，He，Fan，Luo，Bin，Dong，Xiaohu，Dai 展开 摘要： 展开 ...
Get PriceThe special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)‐containing wastewater that could use HPAM as the sole carbon source and nitrogen source. Through optimizing the condition of HPAM biodegradation, the removal rate of R2 free strain reached to 41.6% when pH was 7, temperature was 35°C, inoculation quantity (v
Get Price2018-5-1 · Biodegradation of hydrolyzed polyacrylamide by the combined expanded granular sludge bed reactor-aerobic biofilm reactor biosystem and key microorganisms involved in this bioprocess. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and ...
Get PriceBiodegradation of partially hydrolyzed polyacrylamide hpam using bacteria isolated from omani oil fields. Society of Petroleum Engineers - SPE EOR Conference at Oil and Gas West Asia 2018. Vol. 2018-March Society of Petroleum Engineers, 2018.
Get Price2019-12-12 · We describe here the development of multifunctional nanocarriers, based on amine-functionalized biodegradable polyacrylamide nanoparticles (NPs), for cancer theranostics, including active tumor targeting, fluorescence imaging, and photodynamic therapy. The structural design involves adding primary amino groups and biodegradable cross-linkers during the NP polymerization, while …
Get Price2019-11-26 · F. Ma, L. Wei, C.C. Chang, The isolation and identification of a hydrolyzed polyacrylamide (HPAM) degrading bacteria strain H1 and its function for sulfide reduction, Int. J. …
Get Price2021-5-23 · Biodegradation of partially hydrolyzed polyacrylamide by immobilized bacteria isolated from HPAM‐containing wastewater - Liu - 2016. The special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)‐containing wastewater that could use HPAM as the sole carbon source and nitrogen source.
Get PricePolyacrylamide (PAM), a linear water-soluble polymeric compound with a high molecular weight, is widely used in wastewater treatment processes 1,2, papermaking 3, soil conditioning 4,5, irrigation furrow anticorrosives 6 and oil production 7.Although PAM is generally accepted as a non-toxic substance 8, the incompletely biodegraded intermediate products, especially the acrylamide monomer (AM ...
Get PriceBiodegradation of hydrolyzed polyacrylamide by the combined expanded granular sludge bed reactor-aerobic biofilm reactor biosystem and key microorganisms involved in this bioprocess. Song T(1), Li S(1), Ding W(1), Li H(1), Bao M(2), Li Y(3).
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 PriceAnaerobic biodegradation of partially hydrolyzed polyacrylamide in long-term methanogenic enrichment cultures from production water of oil reservoirs. Hao Hu, Jin Feng Liu *, Cai Yun Li, Shi Zhong Yang, Ji Dong Gu, Bo Zhong Mu * Corresponding author for this work.
Get Price2019-12-12 · We describe here the development of multifunctional nanocarriers, based on amine-functionalized biodegradable polyacrylamide nanoparticles (NPs), for cancer theranostics, including active tumor targeting, fluorescence imaging, and photodynamic therapy. The structural design involves adding primary amino groups and biodegradable cross-linkers during the NP polymerization, while …
Get Price2012-8-28 · Results and discussion. The synthetic procedure of the multifunctional polymer nanomedicine is presented in Figure 1a.Amine functionalized polyacrylamide (AFPAA) PS conjugated NPs were prepared by using a modified water-in-oil micro-emulsion method. 30 The PS, 2-devinyl-2-(1-hexyloxyethyl) pyropheophorbide (HPPH), which is very hydrophobic and currently in Phase II human …
Get Price2021-6-13 · 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
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Get PriceBiodegradation of hydrolyzed polyacrylamide by a Bacillus One of the most vital techniques for EOR is polymer flooding, which is categorized as a third recovery method. Hydrolyzed polyacrylamide (HPAM) is one of the most widely used polymers in oil fields because of its high water solubility, high temperature resistance, salt resistance, easy ...
Get Price2020-9-7 · BAO M, CHEN Q, LI Y, et al. Biodegradation of partially hydrolyzed polyacrylamide by bacteria isolated from production water after polymer flooding in an oil field[J]. Journal of Hazardous Materials,2010,184(1-3):105-110. doi: 10.1016/j.jhazmat.2010.08.011 [2]
Get Price2016-9-29 · Biodegradation is a surface erosion process because enzymes are too large to ... nonbiodegradable polymers such as polyacrylamide prevail. In addition, the substitution pressure to replace nonbiodegradable polymers is different for each application and each region. ... (aspartic acid) might function as dispersion of organic pigments. is a water ...
Get PriceEffects of physicochemical properties of polyacrylamide (PAA) and (polydimethylsiloxane) PDMS on cardiac cell behavior K. Daliri, K. Pfannkuche and B. Garipcan, Soft Matter, 2021, 17, 1156 DOI: 10.1039/D0SM01986K This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further …
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 PriceBiodegradation of partially hydrolyzed polyacrylamide by immobilized bacteria isolated from HPAM‐containing wastewater - Liu - 2016. The special function bacteria R2 was screened from hydrolyzed polyacrylamide (HPAM)‐containing wastewater that could use HPAM as the sole carbon source and nitrogen source.
Get Price2008-7-20 · Biodegradation of p-cresol by immobilized cells of Bacillus sp. strain PHN 1 Biodegradation of p-cresol by immobilized cells of Bacillus sp. strain PHN 1 Tallur, P.; Megadi, V.; Ninnekar, H. 2008-07-20 00:00:00 The Bacillus sp. strain PHN 1 capable of degrading p-cresol was immobilized in various matrices namely, polyurethane foam (PUF), polyacrylamide, alginate and agar.
Get PricePolyacrylamide and water quality effects on infiltration in sandy loam soils. Soil Science Society of America Journal 70(2): 643-650. Ashour, I.A., M.H. Ali, F.A. Hashem and A. Sayed. 2004. Effect of biodegradation of some soil conditioners on soil properties under saline water conditions. Annals of Agricultural Science, Moshtohor 42(1): 401-413.
Get PriceAcrylamide is susceptible to biodegradation in both soil and surface water. Its concentration decreased from 20 to 1 µg/l in 24 hours in the effluent from a sludge dewatering process (Arimitu et al., 1975). One of the most important mechanisms for the removal of acrylamide from soils is enzyme-catalysed hydrolysis; non-biological
Get Price2021-5-20 · Factors influence the viscosity of polyacrylamide. Anionic polyacrylamide solution viscosity over prolonged hydrolysis time is changed, the hydrolysis time is short, a small viscosity, which may be due to polymer had a chance to form a network structure due; hydrolysis time is too long, the viscosity decreased, which is an anionic polymer release induced by acrylamide structure in solution.
Get Price2020-2-20 · Annotated function Prediction for secretion a ... Hence, we prove here that ALC24_4107, and not ALC_2069, is responsible for aliphatic polyester biodegradation by Alcanivorax sp. 24 ... % NuPAGE™ Bis-Tris precast gels (1.0 mm, 10-well, Invitrogen™). Gels were allowed a short migration to enter the polyacrylamide gel (1 cm) before staining ...
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