Fe0体系降解2,4-二氯酚的影响因素及其反应机理

摘要

采用铁屑、炉渣及河砂混合介质降解2,4-二氯酚(2,4 - DCP)模拟废水,研究铁屑粒径、铁屑投加量、铁屑与炉渣配比、pH值等因素对2,4- DCP脱氯效果的影响,探讨Feo体系降解2,4- DCP的反应机理.结果表明,铁屑粒径、铁屑投加量、铁屑与炉渣配比、pH对2,4- DCP脱氯效果均有显著影响,在铁屑粒径为2～5mm、不改变废水pH、铁屑与炉渣质量比为31:9条件下,Feo体系对2,4- DCP去除率高达97％.2,4- DCP经脱氯后主要产物为2-氯酚、4-氯酚和苯酚,反应后废水的可生化性明显提高,利于后续的生物处理.%An experiment was carried out using mixture of iron filings, furnace slag and river sand to dechlorinate simulated 2,4 - DCP-contaminated wastewater, with a view to exploring its affecting factors, like particle-size and rate of iron filings , ratio of iron filings to furnace slag, pH, etc. , and its reaction mechanism. Results show that all the above-listed factors had significant effects on dechlorination. The Fe° system could remove as much as 97% of the contaminant when its I-ron filings was 2-5 mm in particle size, pH of the wastewater remained unchanged, and the ratio of iron filings to furnace slag was 31:9. After dechlorination 2,4 -DCP in the wastewater was turned mainly into 2 -CP, 4-CP and phenol, leaving the water be much improved in biodegradability for further treatment.