ZHANGJiao,LIYi,YANGXiao-chun,et al.In Situ Preparation of Ferrate by Calcium Method for Glyphosate Degradation in Water[J].China Water & Wastewater,2022,38(19):76-81.
In Situ Preparation of Ferrate by Calcium Method for Glyphosate Degradation in Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第19期
Page:
76-81
Column:
Date of publication:
2022-10-01
- Keywords:
- ferrate; glyphosate; degradation pathway; biotoxicity
- Abstract:
- Calcium method was employed to prepare ferrate in situ for degradation of glyphosate in water. The effects of pH, reaction time, ferrate dosage and influent glyphosate concentration on degradation efficiency were investigated. In addition, the degradation kinetics and degradation pathway were explored, and biotoxicity of the degradation products was evaluated. The degradation of glyphosate by ferrate consisted of two stages, and both were in accordance with the first-order reaction kinetics. The degradation rate was fast in the first 10 min, and was relatively slow in 10-90 min, and the reaction tended to be stable after 90 min. When the ratio of ferrate to glyphosate was 1∶30 (mL∶mg) and the reaction pH was 5, the best removal performance of glyphosate with a removal rate of more than 95% was obtained, the removal rate of TP was more than 77%, and the removal rate of TN reached 40%. The main nitrogen compound in effluent was ammonia nitrogen, and its maximum concentration was 12.65 mg/L. The main intermediates generated in the degradation were sarsarine, glycine, phosphoric acid, AMPA, glycolic acid and methylphosphonic acid. The degradation process might include three pathways, and the biotoxicity of most intermediates was higher than that of glyphosate.
Last Update:
2022-10-01