DO对硫杆菌污泥调理系统脱水效能的影响

Effect of DO on Dewatering Efficiency of Sludge Conditioning System with Thiobacillus Thiooxidans

针对现有污泥调理技术对污泥脱水性能改善效能低,难以达到现行污泥处置标准对含水率要求的问题,提出了剩余污泥氧化硫硫杆菌生物调理技术,考察了DO对剩余污泥硫杆菌生物调理系统深度脱水效能的影响。在DO为6 mg/L条件下,氧化硫硫杆菌生物调理系统调理污泥脱水后的含水率由75.5%降至63.6%;EPS中蛋白质、腐殖质、多糖分别减少为3.67、3.15、16.17mg/gVSS,污泥结合水含量从2.63 g/gDS降低至1.48 g/gDS;污泥Zeta电位从-14.9 mV降低至0.27 mV,污泥絮体颗粒平均粒径由20.19μm增大到34.51μm,硫杆菌生物调理系统对污泥脱水性能改善显著。

The existing sludge conditioning technology has low improvement efficiency of sludge dewatering and cannot meet the requirements of moisture content in sludge disposal. The conditioning of excess sludge with Thiobacillus Thiooxidans was proposed. The effect of DO on the dewatering efficiency of the excess sludge conditioning system with Thiobacillus Thiooxidans was investigated. When DO was 6 mg/L, the moisture content of dewatered sludge decreased from 75.5% to 63.6%. The contents of pro- tein, humic substance, polysaccharides in EPS decreased to 3.67 mg/gVSS, 3.15 mg/gVSS and 16.17 mg/gVSS respectively. The bound water decreased from 2. 63 g/gDS to 1.48 g/gDS. The Zeta potential decreased from - 14.9 mV to 0.27 inV. The average particle size of dewatered sludge increased from 20.19 μm to 34.51 μm. The conditioning system of excess sludge with Thiobacillus Thiooxidans had sig- nificant improvements on sludge dewatering performance.