title: Effect of waste addition points on the chromium leachability of cement produced by co-processing of tannery sludge.
abstract: The effect of adding position for tannery sludge in a co-processing cement rotary kiln on the chromium leachability of the cement produced was assessed in laboratory scale. Cement clinkers and pastes were produced and evaluated based on analysis of the cement quality, characterization of the clinker crystalline phases, and extraction toxicity of heavy metals in the resulting cements (using the toxicity characteristic leaching procedure (TCLP) and the Chinese GB/T 30810-2014 standard). It was found that the amount of sludge added (up to 0.7% of the feed composition) and use of different addition points for the sludge had no detrimental effect on the resulting cement quality. The retention ratios of heavy metals during sintering were related to their volatilities and the sludge addition points. The Cr concentration in leachate generated by the TCLP was far below the regulatory limit (5mg/L); however, when using the GB/T 30810-2014 procedure, the Cr concentration in the leachate exceeded the regulatory limit (200μg/L) when the sludge addition was greater than or equal to 0.5% and it was added at the kiln main burner position. Based on our laboratory study, tannery sludge might be added at the decomposing furnace addition point to reduce the Cr leachability of the resulting cement.
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, 198 Jiaogong Road, Hangzhou City, Zhejiang Province 310012, China.
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Shen
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, 198 Jiaogong Road, Hangzhou City, Zhejiang Province 310012, China; Hongshi Holding Group Co., Ltd., Dongguo Village, Lanxi City, Zhejiang Province 321100, China.
authors.forename: Minrui
authors.initials: M
authors.lastname: Huang
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, 198 Jiaogong Road, Hangzhou City, Zhejiang Province 310012, China. Electronic address: fenghuajun2000@163.com.
authors.forename: Huajun
authors.initials: H
authors.lastname: Feng
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, 198 Jiaogong Road, Hangzhou City, Zhejiang Province 310012, China.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, 198 Jiaogong Road, Hangzhou City, Zhejiang Province 310012, China.
authors.forename: Yuyang
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, 198 Jiaogong Road, Hangzhou City, Zhejiang Province 310012, China.
authors.forename: Yuyang
authors.initials: Y
authors.lastname: Long
mesh_terms: D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D003252:Construction Materials; D007220:Industrial Waste; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D013633:Tanning; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry
chemical_list: D007220:Industrial Waste; D019216:Metals, Heavy; D012722:Sewage; D014874:Water Pollutants, Chemical; D002857:Chromium
keywords: Cement; Chromium; Leaching; Tannery sludge; Temperature