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| Advanced treatment of piggery wastewater via enhanced coagulation with Mg/Fe layered double hydroxides and analysis of the coagulation sludge properties |
| Received:April 14, 2017 |
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| KeyWord:Mg/Fe layered double hydroxides;enhanced coagulation;piggery wastewater;heavy metals;antibiotic |
| Author Name | Affiliation | E-mail | | HUANG Zhi-yan | Department of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China | | | HU Zhi-lin | Department of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China | | | LIAO Zi-cong | Department of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China | | | LIU Juan | Department of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China | | | Cui Li-hua | Department of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China | | | HUANG Zhu-jian | Department of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China | zjhuang@scau.edu.cn |
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| Abstract: |
| After the second stage of biochemical treatment, piggery wastewater still contains a high level of contaminants, and further processing is required.The effects of initial pH and Mg/Fe molar ratio on the removal of water contaminants were investigated in this study. The coagulation precipitates were analyzed via X-ray diffraction(XRD), scanning electron microscopy(SEM), and Fourier transform infrared spectroscopy(FTIR), and the coagulation sludge was cycled as a kind of catalyst for the first step of resource utilization. The results showed that when the initial pH value of the piggery wastewater was above 6.5, the removal rates of TP and Cr(Ⅵ) and the reduction of turbidity reached over 95%, 35%, and 80%, respectively. When the pH value was higher than 8.0, the removal rates of Zn2+ and Cu2+ reached over 85%, and the removal rate of SMX could reach over 75%. However, the Mg/Fe molar ratio had little effect on coagulation. Analysis of the coagulation sludge showed that mainly layered double hydroxides and iron phosphate minerals were formed. At last, we prepared catalysts with coagulation sludge under the conditions of 700℃ and limited oxygen and found that with the same amount of potassium monopersulfate(PMS) addition, catalysts prepared with coagulation sludge had higher catalytic activity than those prepared with Mg-Fe LDHs. This finding shows the great potential of the obtained coagulation sludge in resource utilization. |
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