低压直流电促进污泥好氧消化的性能研究

Research on the enhancement of sludge aerobic digestion capacity by low-voltage direct electric current

为了提高污水厂的剩余污泥好氧消化效率,在剩余污泥好氧消化过程中施加低压直流电场,研究不同电场条件下污泥中有机物(以MLSS表征)、总磷和沉降性(以SV表征)变化情况,探讨电场对污泥好氧消化效率的影响。结果表明:在直流电压为5 V条件下,间歇通电12 d后,通电1、2、3 h/d组,污泥的MLSS去除率分别达到39.50%、44.50%、44.75%,与未通电组相比,分别提高了33.90%、50.85%、51.69%。并且研究发现在1 h/d的电场条件下,一定周期内污泥的脱氢酶活性与细菌总数高于未通电组。实验表明低压直流电对污泥好氧消化性能有促进作用。

In order to enhance the efficiency of aerobic digestion of excess sludge in wastewater treatment plants ,the low-voltage direct current field has been exerted in the excess sludge aerobic digestion process. Under different electric field conditions,the changing situation of organic substances （characterized by MLSS）,total phosphorus and settlingability （characterized by SV） in sludge, is studied. The effects of electric field on the sludge aerobic digestion efficiency are discussed. The experimental results show that when the direct voltage is 5 V,after it has been electrified for 12 days intermittently, the groups are electrified for 1,2,3 h/d, separately ,the MISS of sludge removing rates reach 39.50% ,44.50% ,44.75% ,respectively. Compared with the group which has not been electrified, these groups are 33.90%, 50.85%, 51.69% higher respectively. It is found that when the electric field is under 1 h/d condition, dehydrogenase activity and the total number of bacteria in a certain period are higher than that of the group which has not been electrified. The experiments show that the low-voltage direct current has positive effect on sludge aerobic digestion capacity.