Glyphosate (PMG) wastewater with 40–600 mg/L organic phosphorus (OP) and 1–4% CH2O was treated by catalytic wet oxidation (CWO) and the lime-catalyzed formose reaction to remove total phosphorus (TP) and improve biodegradability. Activated carbons (ACs) modified by H2O2 oxidation and thermal treatment with melamine were used as CWO catalysts and characterized by N2 adsorption/desorption and XPS. The CWO experiments were performed in an autoclave reactor at 110–130 °C and 1.0 MPa. The modified AC showed higher catalytic activity than the parent AC due to the introduction of nitrogen-containing functional groups, exhibited over 90% OP removal for various real PMG wastewaters, and had good stability for 20 consecutive CWO runs. The CWO effluents were further treated by lime at 80 °C to remove TP and CH2O. The treated effluents, containing 0.5–12 mg/L TP and 20–60 mg/L CH2O, showed good biodegradability with a BOD5/COD ratio of 0.31–0.41. The combination of CWO and lime is an effective treatment method prior to biological treatment for solving the problems of OP and CH2O encountered by the glyphosate industry.
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Research Article|
January 02 2017
Removal of organic phosphorus and formaldehyde in glyphosate wastewater by CWO and the lime-catalyzed formose reaction
Bo Xing;
Bo Xing
1Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
2University of Chinese Academy of Sciences, Beijing 100049, China
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Honglin Chen;
1Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
E-mail: hlchen@cioc.ac.cn
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Xiaoming Zhang
Xiaoming Zhang
1Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
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Water Sci Technol (2017) 75 (6): 1390–1398.
Article history
Received:
June 21 2016
Accepted:
December 14 2016
Citation
Bo Xing, Honglin Chen, Xiaoming Zhang; Removal of organic phosphorus and formaldehyde in glyphosate wastewater by CWO and the lime-catalyzed formose reaction. Water Sci Technol 23 March 2017; 75 (6): 1390–1398. doi: https://doi.org/10.2166/wst.2017.006
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