常温下改进型EGSB处理城市污水的中试

通过中试实验,在常温下考察了回流比、水力停留时间和冲击负荷对改进型EGSB处理城市污水效果的影响。实验结果表明,随着回流比的提高,水力停留时间的缩短,改进型EGSB的出水CODfilt是下降的,但当水力停留时间低于2 h时,出水CODCr、CODfilt和SS明显增高。改进型EGSB通过改进回流水系统及布水系统,有效地降低了沉淀区水流上升速度,提高了布水效果,同未改进的EGSB相比,出水CODCr最大下降了26.7 mg/L,CODfilt最大下降了17.8 mg/L,而出水中SS最大下降了66.3 mg/L。当容积负荷突然升高时,对2套反应器都带来冲击,但改进型EGSB比EGSB要容易从冲击中恢复稳定。

PILOT STUDIES ON TREATING MUNICIPAL SEWAGE UNDER NORMAL TEMPERATURE BY MODIFIED EGSB

It is examined that the effects of circumfluence ratio,hydraulic retention time and volume loading rate on treating urban sewage by modified expaned granular sludge bed(EGSB).The results show that the effluent COD_(filt) of modified EGSB is decreased as circumfluence ratio increasing and hydraulic retention time decreasing,however,effluent SS,COD_(filt) and COD_(Cr) are increased evidently when hydraulic retention time is lower than 2 h.As compared with unmodified EGSB,effluent COD_(Cr) of modified EGSB is decreased by 26.7 mg/L and COD_(filt) is decreased by(17.8 mg/L,)while SS is also decreased by 66.3 mg/L.The modified EGSB and unmodified EGSB became unstable when volume loading rate increased abruptly;however,modified EGSB can recover from impact easier than unmodified EGSB.