制革湿整饰废水的微电解-Fenton氧化联合预处理工艺研究  

Pretreatment technology of leather post- tanning wastewater by combining micro- electrolysis and Fenton oxidation processes

作　　者：吴天昊[1] 吴育彪 关正祥 李清松 彭必雨[4] 

机构地区：[1]四川大学化学学院,四川成都610065 [2]白银普瑞特化工有限公司,甘肃白银730090 [3]甘肃省皮革塑料研究所,甘肃兰州730010 [4]四川大学制革清洁技术国家工程实验室,四川成都610065

出　　处：《中国皮革》2016年第12期37-40,44,共5页China Leather

摘　　要：针对制革染整废水中含铬和可生化降解性差的问题，研究了碱沉淀除铬与铁碳微电解-Fenton氧化组合的废水预处理工艺，并对工艺条件进行了优化。结果表明：碱沉淀除铬的最佳pH值为8．5，铬去除率大于99％；铁碳微电解-Fenton氧化联合工艺的最佳工艺条件为：两级微电解反应初始pH值2．5，曝气量2L／min，每级反应时间为45min；Fenton氧化反应初始pH值为3．0，双氧水的浓度为5mL／L，反应时间为90min；Fenton氧化反应后调水样pH值为8．0-8．5进行絮凝沉淀。预处理后，废水中的COD去除率达73％，BOD／COD值由0．11提高到0．48，明显提高了废水的可生物降解性。Aiming at the problems of containing chromium and poor biochemical degradability existing in wastewater from leather post - tanning processes, an integrated technology of wastewater pretreatment, combining alkali precipitation to remove chromium, micro electrolysis and Fenton oxidation, was studied, and the processing conditions were optimized. Results show that the optimal pH value to remove chromium with alkali precipitation is 8.5, and the chromium removal rate is more than 99%. The optimal initial pH is 2.5, aeration rates is 2L/min, and each - stage reaction time is 45min, during the two - stage micro - elec- trolysis process. The optimal initial pH is 3.0, concentration of hydrogen peroxide is 5mL/L, and reaction time is 90 min, during Fenton oxidation process. Flocculate precipitate is carried under the pH 8.0 - 8.5 of mixed water sample after Fenton oxidation process. Under the optimum reaction conditions, COD removal efficiency is 73%, the BOD/COD value improves from 0.11 to 0.48, and the biodegradability of the pre - treated wastewater is significantly improved.

关 键 词：染整废水 脱铬 微电解 FENTON氧化 生物降解性 制革 

分 类 号：X794[环境科学与工程—环境工程]