利用臭氧氧化实现污泥的减量

REDUCTION OF SLUDGE BY OZONE TREATMENT

采用AO工艺,对应用臭氧氧化实现污泥减量进行了研究。结果表明,随着臭氧氧化污泥比例的增加,污泥表观产率系数也随之降低,在臭氧投量为0.05gO3/gSS,每天氧化的污泥分别为反应器内污泥的10%、20%、30%时,污泥表观产率系数分别减少24%、46%、73%。虽然随着污泥氧化比例的增大,氧化系统出水COD有所增加,但氧化系统仍能保持其生物处理能力,COD去除率在88%以上。污泥的耗氧速率(OUR)测量结果显示,长期臭氧氧化后,氧化系统OUR为38.2mgO2/gVSS·h,对照系统的OUR为45.9mgO2/gVSS·h,虽然氧化系统OUR略小于对照系统,但氧化系统中的污泥仍有很高的活性,臭氧氧化基本未对系统的生物处理能力产生不利影响。

Continuous experiment in lab scale anoxic-oxic（AO） process was carried out to investigate the effect of sludge reduction by ozonation. The resuits indicated that the apparent yield coefficient of ozone reactor decreased with increasing fraction of the activated sludge by ozone treatment. The apparent yield coefficient of ozone reactor decreased by 24%,46% and 73% respectively when daily treated sludge wasl0%,20%and 30% of the reactor sludge with ozone dosage of 0.05gO3/gSS. The effluent COD concentration in ozone reactor slightly increased with increasing fraction of the activated sludge by ozone treatment, but the biological treatment performance of ozone reactor was maintained and the removal rate of COD reached to more than 88%. Oxygen utilization rate of sludge （OUR）measurement indicated that the OUR in control reactor was 45.9 mgO3/gVSS·h and the OUR in ozone reactor was 38.2mgO2/gVSS·h after long ozonation. The OUR in ozone reactor was a little lower than that in contrast reactor, but the sludge in ozone reactor was highly activated and the biological treatment performance in ozone reactor was unaffected.