高温ASBR处理水热改性污泥的工艺特性

采用高温ASBR处理水热改性污泥.结果表明,高温ASBR处理水热改性污泥的有机负荷(COD)由7.762kg/(m3·d)提升到13.106kg/(m3·d)后,会导致反应器内VFA的积累,pH和产气量的下降,反应器出现"酸化"现象.这种酸化现象属可恢复性酸化.系统恢复后,ASBR的有机负荷(COD)能达到10kg/(m3·d).高温ASBR在有机负荷(COD)为2.523、4.196、7.762、10.091kg/(m3·d)时的产气率(CH4/COD投入)分别为250、247、219、187mL.高温ASBR的有机负荷OLR与产甲烷速率MPR和COD产气率之间都呈现良好的线性关系,随着OLR的增加,产甲烷速率增大,COD产气率减少.

Characteristics of Thermophilic ASBR Treating Thermal-hydrolyzed Sewage Sludge

The characteristics of thermophilic anaerobic sequencing batch reactor (ASBR) treating thermal-hydrolyzed sewage sludge were investigated. The results showed that increasing the OLR (COD) of the thermophilic ASBR treating thermal-hydrolyzed sewage sludge from 7.762 kg/(m3 x d) to 13.106 kg/(m3 x d) lead to the "acidification" of the reactor with the accumulation of the volatile fatty acid (VFA) and the drop of the pH and gas production. This acidification is recoverability. The OLR(COD) of the thermophilic ASBR treating thermal-hydrolyzed sewage sludge can reach to 10 kg/(m3 x d) after the system was recovered. Under the OLR(COD) of 2.523, 4.196, 7.762 and 10.091 kg/(m3 x d), the methane yield (CH4/COD(input)) of thermophilic ASBR were 250, 247, 219 and 187 mL respectively. There are significant linear relationship among OLR and MPR, the methane yield. With the increase of the OLR, the methane production rate increased while the methane yield reduced.