童宏祥1,
徐诗琦1,
王鑫2,
郭沨2,
王琳玲1,
陈静1
1.华中科技大学环境科学与工程学院,武汉 430074
2.华中科技大学化学与化工学院,武汉 430074
基金项目: 国家自然科学基金面上项目(4167010372)
教育部中央高校资助项目(2015QN124)
Oxidization/stabilization of high concentration arsenic containing sludge using calcium hypochlorite and calcium oxide
ZHANG Shuyuan1,,TONG Hongxiang1,
XU Shiqi1,
WANG Xin2,
GUO Feng2,
WANG Linling1,
CHEN Jing1
1.School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2.School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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摘要:针对某硫酸厂废水处理后产生的高浓度含砷(As)污泥,开展氧化稳定化处理技术研究。以浸出毒性作为评价指标,探讨次氯酸钙和氧化钙联合使用对污泥中As的稳定化处理效果,结合XPS和XRD表征探讨了稳定化机制。结果表明:原始污泥中As主要以As(Ⅲ)形式存在,次氯酸钙能将As(Ⅲ)氧化成As(Ⅴ)；加入氧化钙能同时提高Ca/As摩尔比和pH,Ca与As(Ⅴ)结合形成稳定的砷酸钙盐。依次加入质量比为5%的次氯酸钙和10%的氧化钙,使Ca/As摩尔比达到2.4以上,As的稳定化率达到99%以上,浸出浓度从181 mg·L-1降低至1.5 mg·L-1,且浸出液pH小于12,达到《危险废物填埋污染控制标准》(GB 18598-2001)要求。
关键词: 含砷污泥/
氧化/
稳定化/
次氯酸钙/
氧化钙
Abstract:A strategy for oxidation and stabilization of sludge with high arsenic concentration, produced by a sulfuric plant was proposed. Calcium hypochlorite and calcium oxide were utilized and the stabilization effect was evaluated by toxicity characteristic leaching procedure (TCLP). The stabilization mechanism was discussed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). As(Ⅲ) dominated in untreated sludge was oxidized into As(Ⅴ) by calcium oxide. The calcium oxide addition increased the Ca/As mole ratio and pH, then Ca reacted with As(Ⅴ) to produce calcium arsenate. With the addition of 5% calcium hypochlorite and 10% calcium oxide (weight ratio), the stabilization ratio of As reached 99% with Ca/As molar ratio of 2.4, and the leaching concentration of As decreased from 181 mg·L-1 to 1.5 mg·L-1 at pH less than 12. The result meets the Standard for Pollution Control on the Security Landfill Site for Hazardous Wastes (GB 18598-2001).
Key words:arsenic-containing sludge/
oxidation/
stabilization/
calcium hypochlorite/
calcium oxide.
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| [2] | 赵述华, 张太平, 陈志良,等.金矿区高浓度砷污染土壤的稳定化处理[J].环境工程学报,2016,0(10):5987-5994 |
| [3] | 陈萌, 杨国录, 余亮英.粉煤灰和NaOH固化稳定化受污淤泥试验研究[J].华中科技大学学报(自然科学版),2013,1(10):123-127 |
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刊出日期:2018-02-08
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次氯酸钙/氧化钙对高砷污泥的氧化稳定化处理
张淑媛1,,童宏祥1,
徐诗琦1,
王鑫2,
郭沨2,
王琳玲1,
陈静1
1.华中科技大学环境科学与工程学院,武汉 430074
2.华中科技大学化学与化工学院,武汉 430074
基金项目: 国家自然科学基金面上项目(4167010372) 教育部中央高校资助项目(2015QN124)
关键词: 含砷污泥/
氧化/
稳定化/
次氯酸钙/
氧化钙
摘要:针对某硫酸厂废水处理后产生的高浓度含砷(As)污泥,开展氧化稳定化处理技术研究。以浸出毒性作为评价指标,探讨次氯酸钙和氧化钙联合使用对污泥中As的稳定化处理效果,结合XPS和XRD表征探讨了稳定化机制。结果表明:原始污泥中As主要以As(Ⅲ)形式存在,次氯酸钙能将As(Ⅲ)氧化成As(Ⅴ)；加入氧化钙能同时提高Ca/As摩尔比和pH,Ca与As(Ⅴ)结合形成稳定的砷酸钙盐。依次加入质量比为5%的次氯酸钙和10%的氧化钙,使Ca/As摩尔比达到2.4以上,As的稳定化率达到99%以上,浸出浓度从181 mg·L-1降低至1.5 mg·L-1,且浸出液pH小于12,达到《危险废物填埋污染控制标准》(GB 18598-2001)要求。
English Abstract
Oxidization/stabilization of high concentration arsenic containing sludge using calcium hypochlorite and calcium oxide
ZHANG Shuyuan1,,TONG Hongxiang1,
XU Shiqi1,
WANG Xin2,
GUO Feng2,
WANG Linling1,
CHEN Jing1
1.School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2.School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Keywords: arsenic-containing sludge/
oxidation/
stabilization/
calcium hypochlorite/
calcium oxide
Abstract:A strategy for oxidation and stabilization of sludge with high arsenic concentration, produced by a sulfuric plant was proposed. Calcium hypochlorite and calcium oxide were utilized and the stabilization effect was evaluated by toxicity characteristic leaching procedure (TCLP). The stabilization mechanism was discussed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). As(Ⅲ) dominated in untreated sludge was oxidized into As(Ⅴ) by calcium oxide. The calcium oxide addition increased the Ca/As mole ratio and pH, then Ca reacted with As(Ⅴ) to produce calcium arsenate. With the addition of 5% calcium hypochlorite and 10% calcium oxide (weight ratio), the stabilization ratio of As reached 99% with Ca/As molar ratio of 2.4, and the leaching concentration of As decreased from 181 mg·L-1 to 1.5 mg·L-1 at pH less than 12. The result meets the Standard for Pollution Control on the Security Landfill Site for Hazardous Wastes (GB 18598-2001).
