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首页> 美国卫生研究院文献>Scientific Reports >Waste-Activated Sludge Fermentation for Polyacrylamide Biodegradation Improved by Anaerobic Hydrolysis and Key Microorganisms Involved in Biological Polyacrylamide Removal
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Waste-Activated Sludge Fermentation for Polyacrylamide Biodegradation Improved by Anaerobic Hydrolysis and Key Microorganisms Involved in Biological Polyacrylamide Removal

机译：厌氧水解和生物降解聚丙烯酰胺的关键微生物改善了废料发酵污泥发酵聚丙烯酰胺的生物降解能力。

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摘要

During the anaerobic digestion of dewatered sludge, polyacrylamide (PAM), a chemical conditioner, can usually be consumed as a carbon and nitrogen source along with other organic matter (e.g., proteins and carbohydrates in the sludge). However, a significant accumulation of acrylamide monomers (AMs) was observed during the PAM biodegradation process. To improve the anaerobic hydrolysis of PAM, especially the amide hydrolysis process, and to avoid the generation of the intermediate product AM, a new strategy is reported herein that uses an initial pH of 9, 200 mg COD/L of PAM and a fermentation time of 17 d. First, response surface methodology (RSM) was applied to optimize PAM removal in the anaerobic digestion of the sludge. The biological hydrolysis of PAM reached 86.64% under the optimal conditions obtained from the RSM. Then, the mechanisms for the optimized parameters that significantly improved the biological hydrolysis of PAM were investigated by the synergistic effect of the main organic compounds in the sludge, the floc size distribution, and the enzymatic activities. Finally, semi-continuous-flow experiments for a microbial community study were investigated based on the determination of key microorganisms involved in the biological hydrolysis of PAM.
机译：在脱水污泥的厌氧消化过程中，化学调节剂聚丙烯酰胺（PAM）通常可以与其他有机物质（例如污泥中的蛋白质和碳水化合物）一起作为碳和氮源消耗。但是，在PAM生物降解过程中观察到了丙烯酰胺单体（AMs）的大量积累。为了改善PAM的厌氧水解，特别是酰胺水解过程，并避免中间产物AM的产生，本文报道了一种新的策略，该策略使用PAM的初始pH为9、200μmgCOD / L和发酵时间17 d。首先，应用响应面方法（RSM）在污泥的厌氧消化中优化PAM去除。在从RSM获得的最佳条件下，PAM的生物水解达到86.64％。然后，通过污泥中主要有机化合物的协同作用，絮凝物的粒径分布和酶促活性，研究了优化参数的机制，该参数可显着改善PAM的生物水解。最后，在确定参与PAM生物水解的关键微生物的基础上，研究了用于微生物群落研究的半连续流实验。

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