响应面法优化污泥炭催化湿式过氧化氢氧化降解间甲酚模拟废水  

Optimization of m-cresol degradation by sludge-derived carbon in catalytic wet peroxide oxidation using response surface methodology

作　　者：赵颖[1,2] 王亚旻 卫皇曌[1] 于杨[1,2] 孙承林[1] 

机构地区：[1]中国科学院大连化学物理研究所,大连116023 [2]中国科学院大学,北京100049

出　　处：《环境化学》2016年第3期516-525,共10页Environmental Chemistry

摘　　要：以污水处理厂剩余污泥为原料制备硝酸改性活性炭,用于催化湿式过氧化氢氧化(CWPO)处理间甲酚模拟废水,以实现剩余污泥的资源化利用.使用物理吸附、程序升温脱附(TPD)、X射线荧光光谱(XRF)等表征方法对污泥炭的物理化学性质进行测定.而后采用响应面法(RSM)优化污泥炭CWPO降解间甲酚的反应条件,选取反应温度、反应时间、初始pH值、过氧化氢(H_2O_2)投加量及催化剂投加量为影响因子,总有机碳(TOC)去除率为响应值,应用中心组合设计(CCD)建立响应值与各影响因子之间关系的二次多项式数学模型,采用后退回归法进行模型精简,并通过方差分析对模型进行可信程度检验.优化结果表明,在反应温度为60℃,反应时间为120 min,初始pH=3.00,H_2O_2投加量为2.03 g·L^(-1),催化剂投加量为0.78 g·L^(-1)的条件下,可达到最佳效果,此时预测模型的TOC去除率为44.6%,间甲酚转化率为100%.通过模型验证实验得到的TOC去除率为46.6%,仅与理论值相差2.0%,在95%的置信区间内,说明该模型具有可靠性.最后采用GC-MS对污泥炭CWPO降解间甲酚中间产物进行分析.In this study,nitric acid modified activated carbon prepared from excess sludge produced in sewage treatment plant was employed to degrade m-cresol simulated wastewater by catalytic wet peroxide oxidation（ CWPO）,which helps to recycle and re-utilize the waste sludge. Physical adsorption,temperature programmed desorption（ TPD） and X ray fluorescence spectrometry（ XRF）were used to determine the physical and chemical characteristics of the sludge-derived activated carbon,and the response surface methodology（ RSM） was applied to optimize the reaction conditions. Reaction temperature, reaction time, initial pH value, hydrogen peroxide（ H2O2）dosage,catalyst dosage were selected as factors while total organic carbon（ TOC） removal rate was the response. An quadratic polynomial mathematical model between the response and 5 impact factors was derived using the central composite design（ CCD）,refined using the backward regression method,and examined through the analysis of variance（ ANOVA）. The optimized reaction conditions in CWPO process were found out to the reaction temperature of 60 ℃,the reaction time of120 min,initial pH = 3.00,H2O2 dosage of 2.03 g·L^（-1）,catalyst dosage of 0.78 g·L^（-1）. TOC removal rate and m-cresol conversion reached their optimal values at 44.6% and 100%,respectively. Under these conditions,The TOC removal rate in the validation experiment was 46.6%. This experimental optimal TOC removal rate is only 2.0% more than its theoretical optimum and is within the 95%confidence interval. The intermediate products from the m-cresol degradation process by sludge derived activated carbon were also analyzed using GC-MS.

关 键 词：催化湿式过氧化氢氧化 间甲酚 响应面法 污泥炭. 

分 类 号：X703[环境科学与工程—环境工程]