| 生物沥浸耦合类Fenton氧化调理城市污泥 |
| 摘要点击 2527 全文点击 1264 投稿时间：2014-06-15 修订日期：2014-07-30 |
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| 中文关键词 城市污泥 生物沥浸 类Fenton氧化 脱水性能 稳定性能 |
| 英文关键词 sewage sludge bioleaching Fenton-like oxidation dewaterability stability |
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| 中文摘要 |
| 采用生物沥浸耦合类Fenton氧化工艺对城市污泥进行了调理研究. 结果表明,在升华硫和FeSO4·7H2O投量分别为3 g·L-1和8 g·L-1时,污泥pH从6.9降至2.5约需1 d,满足类Fenton氧化的适宜酸性条件. 生物沥浸处理后,污泥挥发性固体(VS)减少率为13.4%,污泥比阻从3.1×109 s2·g-1降至1.5×109 s2·g-1,降低51.6%,但仍属于难脱水污泥. 沥浸污泥继续经类Fenton氧化调理,调理的最佳H2O2投量和反应时间分别为3.3 g·L-1和60 min. 处理后污泥VS减少率为30.8%,污泥比阻和滤饼含水率分别为1.9×108 s2·g-1和76.9%,污泥比阻降低93.9%,污泥脱水性能和稳定性能得到显著提高. 此外,该联合工艺对污泥的调理效果优于类Fenton氧化单独调理. |
| 英文摘要 |
| Bioleaching combined with Fenton-like oxidation was used to condition sewage sludge. The results showed that it took~1 d to decrease pH from 6.9 to 2.5 by bioleaching, with fixed sulfur power and FeSO4·7H2O dosages of 3 g·L-1 and 8 g·L-1, respectively. After bioleaching, the volatile solids(VS) reduction was 13.4%, and the specific resistance to filtration(SRF) dropped from 3.1×109 s2·g-1 to 1.5×109 s2·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·L-1 and 60 min, respectively. Under the optimal conditions, VS reduction was 30.8%, SRF was declined to 1.9×108 s2·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. |
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