摘要
以城市污泥脱水和病原微生物灭活为目标,以S~0和FeS_2为能量底物,利用嗜酸性硫杆菌复合菌群对初始p H值在3.0~10.0范围内的城市污泥进行生物沥浸处理。结果表明,当达到最佳沥浸时刻时,污泥比阻由(2.7~2.8)×10~(12)m/kg降至(2.1~3.9)×10~(11)m/kg;沉降率由68%~75%提高至79%~86%;对SS的去除率达到7.2%~38.3%。当初始p H值为5.0、生物沥浸48 h时,污泥脱水和沉降性能均达到最佳状态:比阻由2.8×10~(12)m/kg降为2.1×10~(11)m/kg,沉降率由69%升至83%,SS去除率为16.1%。在不同初始pH值下对病原微生物的灭活率均在99%以上,初始p H值对灭菌无影响。
Aiming for the municipal sludge dewatering and pathogen inactivation,compound bacterium of acidophilic Thiobacilli was used in bioleaching process,with zero-valent sulfur and iron disulfide as energy substrate,to treat municipal sludge with initial p H value ranging from 3. 0 to 10. 0. The results showed that when reaching the optimum bioleaching time,the SRF had decreased from( 2. 7-2. 8) × 10~(12)m/kg to( 2. 1-3. 9) × 10~(11)m/kg,the sedimentation rate had increased from 68%-75% to79%-86%,and the SS removal rate had reached up to 7. 2%-38. 3%. The dewatering and settling performance reached the optimum condition after 48 hours with an initial p H value of 5. 0. The SRF declined from 2. 8 × 10~(12)m/kg to 2. 1 × 10~(11)m/kg,the sedimentation rate rose from 69% to 83%,and the SS removal rate was 16. 1%. In addition,the inactivation rate of pathogenic microorganism was more than 99% with any initial pH values,i. e.,it was insensitive to initial p H values.
引文
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