通过生物浸出与类芬顿氧化相结合对污水污泥进行调理

[Sewage sludge conditioning by bioleaching combined with Fenton-like oxidation].

作者信息

Liu Chang-geng, Zhang Pan-yue, Jiang Jiao-jiao, Zeng Cheng-hua, Huang Yi, Xu Guo-yin

出版信息

Huan Jing Ke Xue. 2015 Jan;36(1):333-7.

Abstract

Bioleaching combined with Fenton-like oxidation was used to condition sewage sludge. The results showed that it took approximately 1 d to decrease pH from 6.9 to 2.5 by bioleaching, with fixed sulfur power and FeSO4 x 7H2O dosages of 3 g x L(-1) and 8 g x L(-1), respectively. After bioleaching, the volatile solids(VS) reduction was 13.4%, and the specific resistance to filtration(SRF) dropped from 3.1 x 10(9)s2 x g(-1) to 1.5 x 10(9)s2 x g(-1) with a reduction of 51.6%, but the bioleached sludge was still difficult to be dewatered. The bioleached sludge was further oxidized by Fenton-like oxidation. The results indicated that the optimal H2O2 dosage and reaction time were 3.3 g x L(-1) and 60 min, respectively. Under the optimal conditions, VS reduction was 30.8%, SRF was declined to 1.9 x 10(8) s2 x g(-1) with a reduction of 93.9%, and the moisture of sludge cake was 76.9%. After treated by bioleaching combined with Fenton-like oxidation, the dewaterability and stability of sewage sludge were significantly improved. Besides, the combined technology was more efficient in conditioning sewage sludge than single Fenton-like oxidation.

摘要

采用生物浸出与类芬顿氧化相结合的方法对污水污泥进行调理。结果表明，在固定硫磺粉和FeSO₄·7H₂O投加量分别为3 g·L⁻¹和8 g·L⁻¹的条件下，通过生物浸出将pH值从6.9降至2.5大约需要1天。生物浸出后，挥发性固体（VS）减少了13.4%，过滤比阻（SRF）从3.1×10⁹ s²·g⁻¹降至1.5×10⁹ s²·g⁻¹，降低了51.6%，但生物浸出后的污泥仍难以脱水。对生物浸出后的污泥进行类芬顿氧化进一步处理。结果表明，最佳H₂O₂投加量和反应时间分别为3.3 g·L⁻¹和60 min。在最佳条件下，VS减少了30.8%，SRF降至1.9×10⁸ s²·g⁻¹，降低了93.9%，污泥饼的含水率为76.9%。经过生物浸出与类芬顿氧化联合处理后，污水污泥的脱水性能和稳定性得到显著提高。此外，联合工艺在调理污水污泥方面比单一的类芬顿氧化更高效。