水中硫化物测试提高曝气吹脱效率及富集方法研究

对水中硫化物测试方法中的实验条件进行优化，优化后的测试结果其精密度和准确度都显著提高；对低仿水质样品采用了碱金属氢氧化物共沉淀，简化了样品富集程序，提高了测试灵敏度。     

Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment: effectiveness and statistical optimization

In this work, the enhanced dewaterabing characteristics of waste activated sludge using Fenton pretreatment was investigated in terms of effectiveness and statistical optimization. Response surface method （RSM） and central composite design （CCD） were applied to evaluate and optimize the effectiveness of important operational parameters, i.e., H202 concentrations, Fe2＋ concentrations and initial pH values. A significant quadratic polynomial model was obtained （R2= 0.9189） with capillary suction time （CST） reduction efficiency as the response. Numerical optimization based on desirability function was carried out. The optimum values for H202, Fe2, and initial pH were found to be 178 mg-g-1 VSS （volatile suspended solids）, 211mg.gI VSS and 3.8, respectively, at which CST reduction efficiency of 98.25% could be achieved. This complied well with those predicted by the established polynomial model. The results indicate that Fenton pretreatment is an effective technique for advanced waste activated sludge dewatering. The enhancement of sludge dewaterability by Fenton＇s reagent lies in the migration of sludge bound water due to the disintegration of sludge flocs and microbial cells lysis.     

低温下ABR酸化反应器的运行效果及微生物活性研究

考察了低温对四格室ABR酸化反应器性能的影响.在水力停留时间3 h,进水COD浓度230～300 mg/L,TP浓度1.59～1.93 mg/L,NH4-N浓度23～28 mg/L,进水温度8～15 ℃,酸化出水温度3～9 ℃条件下,溶解性COD最高去除率达56%.沿流程方向反应器前面2个格室的COD净去除量占总去除量的64%,明显高于后面2个格室,去除率也有相似特征.反应器不同格室的挥发性悬浮固体(VSS)浓度也明显不同,前面格室的VSS高于后面格室.造成不同格室COD降解差异的主要原因为生物量不同所致,高生物量对应着高COD去除量和去除率.沿水流方向不同格室中微生物INT脱氢酶活性(DHA)呈递减趋势,前面2个格室的微生物活性明显高于后2个格室.营养物水平不同,微生物活性不同,高营养对应着高活性,高活性对应着高COD去除率.     

淋洗修复重金属和多环芳烃复合污染土壤的研究进展

重金属和多环芳烃（PAHs）常共存于土壤中形成复合污染。作为典型无机污染物和有机污染物的代表,淋洗法可同时有效去除这两类污染物,具有良好的发展前景。本文结合国内外的研究成果,从重金属和PAHs在环境中的行为着手,重点论述了常用淋洗剂的种类、去除机理和优缺点,分析了影响复合污染物去除效果的主要因素,并对今后该技术的发展方向进行了展望。