【摘要】 采用纯氧曝气高温好氧消化技术(TAD)处理污水厂污泥,并与传统空气曝气进行了对比,系统考察了纯氧曝气高温好氧消化反应器的运行性能。研究发现,通过合理调节纯氧曝气量来控制反应器内的溶解氧浓度,可以实现污泥的高温好氧消化,7 d后对VSS的去除率可达40%以上,达到了我国城镇污水处理厂污泥的排放标准。纯氧曝气用于污泥高温好氧消化的氧气利用效率明显高于空气(<25%),最高可达80%。在达到同等污泥稳定化效率的情况下,纯氧曝气量远小于空气曝气量,由于尾气排放造成的能量损失较少,有利于反应器的保温。纯氧曝气速率过高会导致反应器内溶解氧的积累,而在高温条件下过高的溶解氧浓度(>15 mg/L)会对微生物产生一定的毒害作用。更多还原

【Abstract】 The thermophilic aerobic digestion(TAD) with pure oxygen was used to treat municipal sewage sludge,and was compared to that with air aeration.The operation performance of TAD reactor with pure oxygen was investigated.The research finds that controlling DO concentration in the reactor by reasonably regulating pure oxygen aeration rate can realize TAD of sewage sludge.VSS removal efficiency in sewage sludge is more than 40% after 7 days of digestion,reaching the discharge standard of sludge from municipal WWTP in China.The TAD with pure oxygen can obtain higher oxygen utilization efficiency(about 80%) than that with air aeration(lower than 25%).Meanwhile,the pure oxygen aeration rate is much lower than air aeration rate given the same sludge stabilization.Heat loss of oxygen aeration due to off-gas discharge is much lower than that of air aeration,facilitating heat conservation in the TAD reactor.However,the high pure oxygen aeration rate may result in the accumulation of DO in the reactor.High DO concentration(more than 15 mg/L) coupled with high temperature may inhibit the activity of microorganisms that are responsible for sludge digestion.更多还原