Response of biodegradation characteristics of unacclimated activated sludge to moderate pressure in a batch reactor

Chemosphere
Rui-Xiao XuBiao Xie

Abstract

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. CO2 concentration of off-gas was lower in the earlier stage due to CO2 being pressed into the liquid phase and converted into inorganic carbon (IC). More CO2 emission 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.

References

Apr 13, 2002·Current Opinion in Biotechnology·Peter HarmsGovind Rao
Mar 27, 2003·Chemosphere·Xiaoqi Zhang, Paul L Bishop
Jan 26, 2007·Bioresource Technology·Gregor D Zupancic, Milenko Ros
Feb 13, 2007·Water Research·Norbert WeissenbacherMaria Fuerhacker
Nov 9, 2007·Colloids and Surfaces. B, Biointerfaces·Guo-Ping ShengHan-Qing Yu
Dec 24, 2010·Journal of Environmental Sciences (China)·Zanfang JinChunmian Lin
Apr 2, 2014·Bioresource Technology·Trilok Chandra YadavAtya Kapley

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Citations

Jun 16, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Yong ZhangBiao Xie
Apr 28, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jia-Ying HeYong Zhang

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