含腐殖酸还原菌的污泥降解底泥中溶解性有机质

DEGRADATION OF DISSOLVED ORGANIC MATTERS IN SEDIMENT BY SLUDGE CONTAINING HUMIC ACID REDUCING BACTERIA

在实验室条件下,以天津市某污水处理厂二沉池剩余污泥为活性污泥,探究其在投入河道后对底泥中溶解性有机质(DOM)的降解效果及优化措施。结果表明:使用蒽醌-2,6-双磺酸钠(AQDS)驯化活性污泥30 d,可以将其中的腐殖酸还原菌浓度提高约33倍,同时显著提高对底泥DOM的降解效果,降解率由负值提高至22%;腐殖酸还原菌对DOM的降解率随底泥腐殖化程度升高而升高,底泥的E3/E4值为6. 34时,DOM降解率仅为30%,E3/E4值为4. 54时,DOM降解率为49%;投加Ca(NO3)2可以显著提高DOM降解率,由54%提高至71%,最佳投加量为0. 32 g/L;投加促生剂同样可以显著提高DOM降解率,由52%提高至75%,最佳投加量为0. 04 g/L。

The residual sludge from the secondary sedimentation tank of a sewage treatment plant in Tianjin was used as activated sludge under laboratory conditions, to study its degradation effect on dissolved organic matter (DOM) in sediment and optimization measures after it was put into river. The results showed that: the concentration of humic acid reducing bacteria in activated sludge could be increased by about 33 times after acclimated with anthraquinone-2, 6-disulfonic acid sodium (AQDS) for 30 days, and the degradation effect of DOM in sediment could be significantly improved, with the degradation rate increasing to 22% from negative value;the degradation rate of DOM by humic acid reducing bacteria increased with the increase of the degree of sediment colonization;when E 3/ E 4 value of sediment was 6.34, the degradation rate of DOM was only 30%;when E 3/ E 4 value was 4.54, the degradation dosage rate of DOM was 49%;the degradation rate of DOM could be increased significantly through addition of Ca(NO 3) 2, from 54% to 71%, and the optimal addition dosage was 0.32 g/L;the degradation rate of DOM also could be increased significantly through addition of biostimulant, from 52% to 75%, and the optimal addition dosage was 0.04 g/L.