在液态污泥的蚯蚓过滤过程中，重金属（Zn、Pb、Cr 和 Cu）的增强稳定性。
Enhancement stabilization of heavy metals (Zn, Pb, Cr and Cu) during vermifiltration of liquid-state sludge.
机构信息
Key Laboratory of Yangtze River Water Environment, Ministry of Education, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Key Laboratory of Yangtze River Water Environment, Ministry of Education, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
出版信息
Bioresour Technol. 2013 Oct;146:649-655. doi: 10.1016/j.biortech.2013.07.144. Epub 2013 Aug 6.
This paper illustrated the potential effect of earthworms on heavy metal stabilization after vermifiltration of liquid-state sludge. Significant enhancement of organics degradation in sludge caused an increase of heavy metal concentrations in VF effluent sludge. However, the analysis of heavy metal chemical speciation indicated earthworms made unstable fractions of heavy metals transformed into stable fractions. Further investigation using principal component analysis revealed that transformations of heavy metal fractions were mainly due to the changes in sludge physico-chemical properties of pH, soluble chemical oxygen demand and available phosphorus. The bioassay of earthworms indicated that only zinc was accumulated by earthworms because the unstable fraction was its main chemical speciation. Furthermore, risk analysis demonstrated that earthworm activities weakened heavy metal risk due to the formation of stable fractions although their total concentrations increased. These results indicated that earthworms in vermifilter had a positive role in stabilizing heavy metals in sewage sludge.
本文阐述了蚯蚓在液体污泥过滤后的稳定化作用对重金属的潜在影响。污泥中有机物的降解显著增强，导致 VF 出水中污泥中重金属浓度增加。然而，重金属化学形态分析表明，蚯蚓使不稳定的重金属转化为稳定的重金属。进一步的主成分分析表明，重金属形态的转化主要是由于污泥物理化学性质（pH 值、可溶解化学需氧量和有效磷）的变化。蚯蚓的生物测定表明，只有锌被蚯蚓积累，因为不稳定的部分是其主要的化学形态。此外，风险分析表明，尽管重金属总浓度增加，但由于形成稳定部分，蚯蚓的活动减弱了重金属的风险。这些结果表明，蚯蚓在蚯蚓过滤器中对稳定污水污泥中的重金属具有积极作用。
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