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The Changes of Residual Iron and pH Value in Papermaking Waste Water Treated with Magnetized PFS
  
DOI：10.11981/j.issn.1000-6842.2018.04.7
Key Words:papermaking wastewater; polymeric ferric sulfate; variable frequency magnetic field; residual iron; pH value
Fund Project:江苏省科技厅科技支撑计划项目（BY2016065-61）。
Author NameAffiliation
GU Shi-guo1 1. Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province, 214122 
LIAN Fei1,* 1. Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province, 214122 
ZHANG Yi-kang1 1. Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province, 214122 
YAN Ke-jun2 2.Department of Civil Engineering, Yancheng Institute of Technology， Yancheng， Jiangsu Province， 224051 
PAN Mei3 3.School of Environmental Science and Engineering， Yancheng Institute of Technology, Yancheng， Jiangsu Province， 224051 
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Abstract:
      Papermaking waste water treatment using iron coagulant may increase iron ion concentration in the effluent， which causes secondary pollution. Homemade magnetizing device was used for pre magnetization of PFS using as coagulant in order to reduce the iron content in effluent. The effects of magnetization intensity， PFS dosage， magnetization time on the iron content and pH value of papermaking wastewater were investigated. The experimental results showed that the total iron and ferrous iron contents of the waste water treated with the magnetized PFS were decreased by 47.6% and 53.0% respectively compared with that treated with conventional PFS， and the pH value of the waste water treated with magnetized PFS was lower. When the PFS dosage was 1000 mg/L， the magnetization intensity was 12 mT， the magnetic frequency was 130 Hz， magnetization time was 5 min， the contents of the total iron and ferrous iron in final effluent were 0.688 mg/L and 0.202 mg/L， respectively， pH was slightly acidic；when magnetized PFS was used， the removal rates of CODCr and chromaticity of the effluent were increased by 5.5 percentage points and 7.1 percentage points respectively in comparison with that without using magnetized PFS．
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