A combined process of chemical precipitation and flocculation for treating phosphating wastewater

被引：14
作者：
Zhang, Zhengan [1 ,2 ,4 ]
Zheng, Huaili [1 ,4 ]
Sun, Yongjun [3 ]
Zhao, Chuanliang [1 ,4 ]
Zhou, Yuhao [1 ,4 ]
Tang, Xiaoming [1 ,4 ]
Zhao, Chun [1 ,4 ]
机构：
[1] Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, State Minist Educ, Chongqing 400045, Peoples R China
[2] Yibin Univ, Coll Chem & Chem Engn, Yibin 644000, Peoples R China
[3] Nanjing Tech Univ, Coll Urban Construct, Jiangsu Key Lab Ind Water Conservat & Emiss Reduc, Nanjing 211800, Jiangsu, Peoples R China
[4] Chongqing Univ, Ctr Int Res Low Carbon & Green Bldg, Chongqing 400045, Peoples R China
来源：
DESALINATION AND WATER TREATMENT | 2016年 / 57卷 / 53期
基金：
美国国家科学基金会;
关键词：
Flocculation; Chemical precipitation; Phosphating wastewater; Response surface methodology; BOX-BEHNKEN DESIGN; RESPONSE-SURFACE METHODOLOGY; UV-INITIATED POLYMERIZATION; FERRIC SULFATE PAFS; DEWATERING PROPERTIES; OPTIMIZATION; REMOVAL; ZINC; PHOSPHORUS; PERFORMANCE;
D O I：
10.1080/19443994.2016.1157707
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A combined process that involves adjusting pH value, adding calcium chloride and flocculation was used for the removals of zinc (Zn), total phosphorus (TP), and chemical oxygen demand (COD) from phosphatizing wastewater. The result of single-factor experiment showed that the optimum process conditions used for precipitation were phosphating wastewater pH (pHI) of 10.0 and CaCl2 dosage of 25.0gL(-1), and for flocculation were cationic polyacrylamide (CPAM) dosage of 20.0mgL(-1) and pH (pHII) of 8.0. Using the optimum process conditions to treat phosphating wastewater, Zn, TP, and COD were reduced to 0.44, 0.33, 38.0mgL(-1), respectively. Response surface methodology (RSM) was employed to optimize the factors of pHI, CaCl2 dosage, CPAM dosage, and pHII to maximize COD removal efficiency. The significant order of factors that affect COD removal efficiency was as CPAM dosage>pHI>CaCl2 dosage>pHII. The interactions between CPAM dosage and pHII, pHI and pHII are relatively significant. The optimization results of RSM experiment showed that the COD removal efficiency of 82.1% could be achieved with the optimal conditions: pHI of 9.5, CaCl2 dosage of 29.0gL(-1), CPAM dosage of 25.2mgL(-1), and pHII of 7.5.
引用
收藏
页码：25520 / 25531
页数：12
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