Response of biodegradation characteristics of unacclimated activated sludge to moderate pressure in a batch reactor.
Response of biodegradation characteristics of unacclimated activated sludge to moderate pressure in a batch reactor.
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DOI：
10.1016/j.chemosphere.2016.01.018
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发表时间：
2016-04
期刊：
影响因子：
8.8
通讯作者：
Rui-Xiao Xu;B. Li;Yong Zhang;Ling Si;Xian-Qiu Zhang;Biao Xie
中科院分区：
文献类型：
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作者：
Rui-Xiao Xu;B. Li;Yong Zhang;Ling Si;Xian-Qiu Zhang;Biao Xie
本研究旨在探讨中压对未驯化活性污泥的影响。通过小型间歇反应器的压力-大气对比实验，分析了活性污泥中有机物的降解过程、尾气中二氧化碳浓度的变化以及胞外聚合物的特性。结果表明，在有机负荷较高、需氧量较大的情况下，中压对生物过程的降解率有较大的促进作用，说明加压处理高浓度有机废水更合理、更可行。高的氧传递动力提高了氧的利用率，不仅促进了废水中有机物的生物降解，而且导致活性污泥中EPS的消耗。尾气中的CO2浓度在早期较低，这是由于CO2被压入液态并转化为无机碳(IC)所致。在加压好氧过程中，160分钟后观察到更多的二氧化碳排放。加压反应器内EPS较低，这可能是加压技术实现污泥减量化的重要途径。
This study was aimed to investigate the effect of moderate pressure on unacclimated activated sludge. Process of organic degradation, variation of carbon dioxide (CO2) concentration of off-gas and characteristics of extracellular polymeric substances (EPS) of activated sludge were analyzed using pressure-atmospheric comparative experiments in bench-scale batch reactors. It was found that moderate pressure increased the degradation rate more dramatically when the biological process ran under a higher organic load with much more oxygen demand, which illuminated that applications of the pressurized method to high concentration organic wastewaters would be more reasonable and practicable. High oxygen transfer impetus increased utilization of oxygen which not only promoted the biodegradation of organics in wastewater, but also led to more EPS consumption in activated sludge. CO2concentration of off-gas was lower in the earlier stage due to CO2being pressed into the liquid phase and converted into inorganic carbon (IC). More CO2emission was observed during the pressurized aerobic process 160 min later. EPS in pressurized reactor was much lower, which may be an important way of sludge reduction by pressurized technology.