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不同生态床对剩余污泥脱水和稳定化的影响

侯 霜 李子富 张 扬

侯 霜, 李子富, 张 扬. 不同生态床对剩余污泥脱水和稳定化的影响[J]. 环境科学研究, 2015, 28(4): 589-595.
引用本文: 侯 霜, 李子富, 张 扬. 不同生态床对剩余污泥脱水和稳定化的影响[J]. 环境科学研究, 2015, 28(4): 589-595.
HOU Shuang, LI Zifu, ZHANG Yang. Dewatering and Stability of Thickened Municipal Sludge Treated in Different Ecological Wetland Beds[J]. Research of Environmental Sciences, 2015, 28(4): 589-595.
Citation: HOU Shuang, LI Zifu, ZHANG Yang. Dewatering and Stability of Thickened Municipal Sludge Treated in Different Ecological Wetland Beds[J]. Research of Environmental Sciences, 2015, 28(4): 589-595.

不同生态床对剩余污泥脱水和稳定化的影响

基金项目: 中央高校基本科研业务费专项资金(FRF-1C-11-001); 昆明市科技计划项目(2012-01-10-A-G-01-0001)

Dewatering and Stability of Thickened Municipal Sludge Treated in Different Ecological Wetland Beds

  • 摘要: 对比分析传统干化床、芦苇生态床及芦苇-蚯蚓复合生态床3种处理方式对城镇污水处理厂剩余污泥的处理效果. 结果表明:传统干化床处理简单易行、成本低,但脱水效率低,处理15 d后污泥含水率仍在79.8%左右. 芦苇生态床较传统干化床具有明显优势,其处置后污泥含水率可降至67.8%,但其对有机质、TN、TP的去除效果不明显. 芦苇-蚯蚓复合生态床对污泥脱水效果最佳:①污泥含水率由原来的95.1%降至44.4%,体积明显减少,达到了污泥减量化的目标;②扫描电镜试验显示,处理后污泥具有孔隙及片状结构,有利于水分散失;③污泥中w(有机质)、w(TN)、w(TP)分别降低了14.5%、20.3%和13.2%左右. 热重分析发现,污泥中不稳定化合物含量有所降低. 经芦苇-蚯蚓复合生态床处理后,Cu、Ni、Zn、Cr残渣态所占比例分别由原污泥的3.2%、23.7%、15.2%、55.8%增至73.3%、43.1%、78.3%和78.6%,大幅降低了重金属的迁移风险,并且污泥红外图谱显示─COOH和酰胺明显增多,有利于重金属的稳定. 综上,复合生态床可有效实现污泥减量,并且降低了二次污染的风险.

     

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