Influence of coagulation pretreatment on the residue of veterinary antibiotics in the process of struvite recovery from swine wastewater
ZHANG Jian-qiao1,2, LOU Yao-yin1, YE Zhi-long1, CHEN Shao-hua1, WEI Qun-shan3
1. Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
2. University of Chinese Academy of sciences, Beijing 100049, China;
3. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Recently, significant antibiotic residue is detected in the recovery of magnesium ammonium phosphate (MgNH4PO4·6H2O, MAP) from the digested livestock wastewater. In case MAP is adopted as fertilizer for the agriculcural use,the antibiotics will be transferred from soil to the plant, consequently do harm to human. In order to reduce antibiotic residues in the final products, coagulation was employed as the pretreatment method before MAP recovery from wastewater. Four coagulants, including PFS (polyferric sulfate), CTS (chitosan), CPAM (cationic polyacrylamides) and PAM(polyacrylamides) were employed to investigate their performance on antibiotic removal. Results revealed that PFS possessed the most effective performance by removing 22.8%~44.8% TCs and 32.2%~70.3% FQs from the wastewater, thereby reduced the antibiotic contents in the recovered solids to TCs 8.6mg/kg~19.6mg/kg, FQs 0.88~12.33mg/kg, respectively. Further experiments concerned the influences of pH and coagulant dosage showed that pH 7.5~8.0 and 17.5mg/L coagulant dosage were the optimal conditions for antibiotic removal, which significantly reduced 43.2%~54.1% TCs and 50.1%~69.5% FQs in the recovered products.
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ZHANG Jian-qiao, LOU Yao-yin, YE Zhi-long, CHEN Shao-hua, WEI Qun-shan. Influence of coagulation pretreatment on the residue of veterinary antibiotics in the process of struvite recovery from swine wastewater. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(7): 2483-2489.
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