高铁酸钾处理剩余污泥过程中重金属形态、迁移性、生物可利用性及生态风险的变化。
Change of heavy metal speciation, mobility, bioavailability, and ecological risk during potassium ferrate treatment of waste-activated sludge.
机构信息
State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
出版信息
Environ Sci Pollut Res Int. 2018 May;25(14):13569-13578. doi: 10.1007/s11356-018-1511-7. Epub 2018 Mar 1.
The effects of potassium ferrate treatment on the heavy metal concentrations, speciation, mobility, bioavailability, and environmental risk in waste-activated sludge (WAS) at various dosages of potassium ferrate and different treatment times were investigated. Results showed that the total concentrations of all metals (except Cd) were decreased slightly after treatment and the order of metal concentrations in WAS and treated waste-activated sludge (TWAS) was Mg > Zn > Cu > Cr > Pb > Ni > Cd. Most heavy metals in WAS remained in TWAS after potassium ferrate treatment with metal residual rates over 67.8% in TWAS. The distribution of metal speciation in WAS was affected by potassium ferrate treatment. The bioavailability and the mobility of heavy metals (except Mg) in TWAS were mitigated, compared to those in WAS. Meanwhile, the environmental risk of heavy metals (except Pb and Cu) was alleviated after potassium ferrate treatment.
研究了不同剂量的高铁酸钾处理和不同处理时间对废活性污泥（WAS）中重金属浓度、形态、迁移性、生物可利用性和环境风险的影响。结果表明，处理后所有金属（除 Cd 外）的总浓度略有下降，WAS 和处理后的废活性污泥（TWAS）中金属浓度的顺序为 Mg > Zn > Cu > Cr > Pb > Ni > Cd。高铁酸钾处理后，WAS 中的大多数重金属仍留在 TWAS 中，TWAS 中的金属残留率超过 67.8%。金属形态在 WAS 中的分布受到高铁酸钾处理的影响。与 WAS 相比，TWAS 中重金属（除 Mg 外）的生物可利用性和迁移性降低。同时，高铁酸钾处理后重金属（除 Pb 和 Cu 外）的环境风险降低。
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