摘要
采用Fenton氧化深度处理柠檬酸废水通过正交试验和单因素轮换试验,分析pH、H_2O_2投加量、反应时间、H_2O_2/FeSO_4四个主要因素对COD_(Cr)去除效果的影响。试验结果表明影响效果从大到小依次为pH>H_2O_2/FeSO_4>反应时间>H_2O_2投加量,单因素试验确定最佳的反应条件为:pH为3.5、反应时间为2 h、30%H_2O_2投加量0.9 mL/L,FeSO_4用量为223.4 mg/L,此条件下COD_(Cr)去除率达到约75%。氧化去除COD_(Cr)过程符合准一级反应,表观速率常数0.012 9 min^(-1),设计连续流全混反应器中停留时间为2 h。在最佳药剂投加量下,中试连续运行出水COD_(Cr)<40 mg/L,实际出水COD_(Cr)与理论拟合值接近。
Fenton oxidation is studied as an advanced treatment process for COD_(Cr) removal of citric acid production wastewater after anaerobic and aerobic biological treatment.The bench scale study on a batch reactor indicated that the oxidation conditions impacts the COD_(Cr) removal effects with the order of:pH>ration of H_2O_2/FeSO_4>reaction time>H_2O_2 dosage.More than 75% COD_(Cr) is removed under the optimized conditions as of 2 h reaction time,pH 3.5 and dosages of 30%H_2O_2 and FeSO_4 at 0.9 mL/L and 223.4 mg/L,respectively.COD_(Cr) removal can be described with pseudo-first order reaction with the observe COD_(Cr) removal rate constant k of 0.012 9 min^(-1). A pilot study is performed on a completely mixed flow-through reactor.The residence time of 2 h on the pilot system is determined on the basis of the theoretical COD_(Cr) removal effect calculated by use of the above observed COD_(Cr) removal rate constant.Under the optimum H_2O_2 and FeSO_4 dosages, the effluent COD_(Cr) of the pilot system is lower than 40 mg/L.The experimental effluent COD_(Cr) on the pilot system is closed to the theoretical values.
出处
《给水排水》
CSCD
北大核心
2010年第S1期236-240,共5页
Water & Wastewater Engineering
基金
国家水体污染控制与治理科技重大专项"工业园区清洁生产和污染源控制技术研究与工程示范"子课题(2008ZX07313-005)
关键词
柠檬酸废水
FENTON氧化
深度处理
Citric acid production wastewater
Fenton oxidation
Advanced treatment
