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《Environmental Science & Technology》 2008-11
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Relationship between Extracellular Polymeric Substance and Soluble Microbial Products

WANG Jin-cui1, SUN Bao-sheng2(1.Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, China; 2.College of Environmental Science and Engineering,Tianjin University,Tianjin 300072,China)  
Through experiment of activated sludge decay process, it was found that there existed relationships of conversion and adsorption-desorption between extracellular polymeric substances (EPS) and soluble microbial products (SMP). In the beginning of decay process (0~19h), bound EPS were hydrolyzed to biomass associated products (BAP), and the cell lysis products also constituted part of SMP. In the phase of SMP biodegradation (19~43h), part of SMP, being biodegradable, were utilized by active biomass as recycled electron donors. Bound EPS and utilization associated products (UAP) were produced. High molecular weight fractions of SMP were adsorbed by bound EPS, and there existed cell lysis faintly. In the excreting and autolyzing phase (43~162h), decay process enhanced and dehydrogenase activity of microorganisms lessened nearly to none. Cell lysis and autolysis occurred. There existed desorption-adsorption between bound EPS and high MW fractions of SMP. In the phase of biodegrading and autolyzing process (162~210h), dominating process was bound EPS hydrolyzing to BAP and bacteria autolysis. SMP were not biodegradable easily, and they had some effect of toxicity on microorganism, restraining the dehydrogenase activity of biomass. While in the presence of toxic materials, more SMP were released by microorganisms.
【Fund】: 天津市应用基础研究计划项目(07JCZDJC02100)
【CateGory Index】: X703
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