摘要
均相Fenton深度处理皮革废水,试验用水为A/O反应池的出水,COD介于180～200mg·L-1.基于Box-Behnken响应曲面法,考察了初始pH值、H2O2/Fe2+摩尔比、过氧化氢投加量、反应时间的单独作用及交互作用,并建立COD去除率数学模型,结果表明:影响因子显著性顺序为:pH>H2O2投加量>反应时间>H2O2/Fe2+摩尔比,初始pH值与H2O2投加量的交互作用显著;数学模型回归性较好,预测最大COD去除率为55.87%,最佳条件组合为:pH=4.0,H2O2投加量=14.00mmol·L-1,H2O2:Fe2+=10.6:1,Time=3h及T=25℃,验证试验结果为53.35%,与预测值相比偏差为4.51%.采用均相Fenton深度处理皮革废水,可以满足《污水综合排放标准》(GB8978—1996)一级标准中对COD≤100mg.L-1的限制要求.
Classical homogeneous Fenton was used to further treat tannery wastewater.Wastewater samples were effluent of A/O biological reactor with COD of 180~200 mg · L-1.Based on Box-Behnken response surface methodology,the primary focus of this paper is to evaluate simple and combined effects of initial pH,molar ratio of H2O2 to Fe2＋,H2O2 dosage,and reaction time,establish an empirical mathematical model between COD removal rate and the above influence factors,and optimize the removal efficiency in Fenton process.The results demonstrated that the significance of influence factors followed the order：pH〉H2O2 dosage〉reaction time〉H2O2/Fe2＋ molar ratio and the combined effect of initial pH and H2O2 dosage was significant.Furthermore,a satisfactory prediction second-order regression model was derived by response surface methodology.The optimal reaction conditions with the highest COD removal rate of 55.87% were determined to be pH=4.0,H2O2 dosage=14.00 mmol · L^-1,time=3 h and T=25 ℃.The experimental results using the above optimal conditions had an average COD removal of 53.35%.The experimental value agreed with the predicted value with 4.51% deviation.Finally,classical homogeneous Fenton process can be adopted for advanced treatment of tannery wastewater to meet the first discharge standard of COD≤100 mg · L^-1 in Integrated Wastewater Discharge Standard（GB8978—1996）.
出处
《环境科学学报》
CAS
CSCD
北大核心
2012年第10期2408-2414,共7页
Acta Scientiae Circumstantiae
基金
国家科技支撑计划(No.2009BAC57B03)~~
