草木灰分散耦合生物发酵对剩余污泥深度脱水

Deep dewatering of activated sludge by adding plant ash for dispersion coupled with biological fermentation

利用草木灰分散剩余污泥中高分子聚丙烯酰胺,在耐热耐碱侧胞菌和effective microorganisms(EM)复合菌作用下,对剩余污泥进行生物发酵、深度脱水和除臭等.研究结果表明,添加草木灰(草木灰与污泥体积比1∶3)可分散絮凝剩余污泥(水质量分数约为80%)中的聚丙烯酰胺,并通过耦合生物发酵对剩余污泥进行深度脱水和除臭.处理前后污泥的pH值由6.7增至12.3;污泥比阻(specific resistance to filtration,SRF)由1.41×1013m/kg降为6.85×1011m/kg;污泥中水的质量分数由80.2%降至46.8%;污泥中聚丙烯酰胺质量分数由4.9 mg/g降为0.2 mg/g;臭味强度由5级变为1级;粪大肠菌群值由6.9×107MPN/g降为0.08 MPN/g,处理后污泥中的氮、磷(以P2O5计)、钾(以K2O计)和有机质质量分数分别为3.4%、9.2%、5.7%和49.9%.该方法可有效实现对絮凝剩余污泥的深度脱水,实现污泥的资源化.

We investigate the biological frementation, deep dewatering, and deodorization of activated sludge by adding plant ash for dispersing polyacrylamide under the condition of heat and alkali resistant lateral and effective mi-croorganisms（ EM） bacterium. The results show that, after treatment of activated sludge by adding 1/3 of plant ash （ in volume） for dispersing polyacrylamide coupled with biological fermentation, the pH of sludge increases from 6. 7 to 12. 3, specific resistance to filtration （SRF） decreases from 1. 41 x 1013 m/kg to 6. 85 x 1011 m/kg;water content decreases from 80. 2% to 46. 8%; polyacrylamide content decreases from 4. 9 mg/g to 0. 2 mg/g; odor grade decreases from 5 to 1;fecal coliform decreases from 6. 9 x107 MPN/g to 0. 08 MPN/g;nitrogen, phosphorus, potas-sium and organic matter of treated sludge can reach about 3. 4%, 9. 2%, 5. 7% and 49. 9%, respectively. Hence, our method can effectively realize the deep dewatering and resourceful utilizing for flocculated activated sludge.