Activated Sludge Ozonation to Reduce Sludge Production in MBR

The total experimental period was divided into two stages. At the first stage, a series of batch studies were carried out to get an understanding of the effect of ozouation on sludge properties. At the following stages, three MBRs with different amounts of activated sludge to be ozonated were run in parallel for a long period to evaluate the influence of sludge ozonation on sludge yield and permeate quality. Through batch study, it was found that ozone could disrupt the cell walls and caused the release of plasm from the cells, then the amounts of soluble organics in the solution increased with ozouation time. With the rise of soluble organics, the amount of soluble organics to be mineralized increased as well, which would reduce the soluble organics content. For the counteraction between these two aspects, a pseudo-balanee could be achieved, and soluble organics would vary in a limited range. Sludge ozonation also increased the contents of nitrogen and phosphorus in the solution. In addition, ozouation was effective in improving sludge settling property. On the basis of batch study, a suitable ozone dosage of 0.16 kgO3/kgMLSS was determined. Three systems were run in parallel for a total period of 39 days, it was demonstrated that a part of activated sludge ozonation could reduce sludge production significantly, and biological perfonnanee of mineralization and nitrification would not be inhibited due to sludge ozouation. Experimental results proved that the combination of ozonation unit with MBR unit could achieve an excellent quality of permeate as well as a small quantity of sludge production, and economic analysis indicated that an additional ozonation operating cost for treatment of both wastewater and sludge was only 0.096Yuan （US$ 0.011,5 ）/m^3 wastewater.     

催化剂载体对催化臭氧化活性的影响

为了制备高效稳定的催化臭氧氧化催化剂,研究了不同载体负载Ru催化剂催化臭氧氧化降解邻苯二甲酸二甲酯(DMP)的效果。结果表明:以Ru作为活性组分时,不适合采用SiO2载体;以Al2O3为载体的RuO2/Al2O3催化剂对有机物的吸附较少,催化作用明显,但是氧化过程中会产生铝溶出的问题;而以活性炭为载体的Ru/AC催化剂对有机物吸附能力较强,催化作用明显,具有很好的稳定性和较长的使用寿命,且催化过程中没有金属溶出的问题,是一种非常有潜力的催化臭氧氧化催化剂。     

水温对臭氧处理印染废水生化出水的影响

以印染废水生化出水为研究对象,采用非线性方程拟合不同水温条件下臭氧对A254（254nm的吸光度）和溶解性有机碳（DOC）的去除过程,分析了表观一级反应速率系数k（t）的变化规律。拟合结果表明,当水温在280³13 K时,60 min内A254和DOC的k（t）变化范围分别为（0.063 5±0.031 6）^{0.089 5±0.044 1}min-1和（0.011 0±0.005 7）^{0.020 9±0.002 9}min-1,且都随反应时间呈整体下降趋势。DOC平均活化能约为A254的2倍,臭氧对DOC的去除更易受到水温变化的影响。另外,较高的溶解臭氧质量浓度有利于在低温条件（280 K）下在反应初始阶段就获得较大的DOC反应速率系数。     

Experimental Study on Minimization of Sludge Production by Ozonation Process

Based on the hypothesis of reducing sludge production under cryptic growth conditions, ozone was used as cell lysis agent to treat excess sludge, and then the ozonated supernatant was returned to. the aeration tank. The results show that COD and NH4+-N removal efficiencies in ozonation process were 87.96% and 84.42%, respectively. Meanwhile, a low excess sludge yield coefficient of 0.113 (g SS/g COD removed) was obtained. Compared with that of the control test, the process configuration decreased the excess sludge production by 51.3%.     

活性炭纳米TiO2催化臭氧化降解有机废水实验研究

采用沉淀—吸附法制备了活性炭纳米TiO2催化剂,催化臭氧化去除废水中的氯乙酸,研究了反应时间、pH值、臭氧浓度等因素对处理效果的影响.实验结果表明:活性炭纳米TiO2臭氧催化氧化法能有效的处理含氯乙酸废水,其COD去除率可达到85%以上.     

生物—臭氧氧化技术处理垃圾渗滤液

采用生物—臭氧氧化技术对垃圾渗滤液进行了研究.结果表明:生物处理可以去除垃圾渗滤液的CODCr;随着氧化时间的延长,去除率随之增大;在碱性条件下进行臭氧氧化,pH值越高,CODCr去除效率越高.采用BOD5/CODCr来表征垃圾渗滤液的生物降解性,研究了臭氧氧化前后垃圾渗滤液生物处理出水的生物降解性变化规律,表明臭氧氧化可以提高垃圾渗滤液生物处理出水的生物降解性,但提高的幅度不大.采用色谱-质谱法对臭氧氧化前后垃圾渗滤液成分进行分析,结果表明:臭氧氧化前后废水中的主要成分没有发生变化,这些物质多为长链烷烃;臭氧氧化使废水中的部分物质发生了结构上的变化,这些物质多为可降解物质.     

催化臭氧氧化垃圾渗滤液水质变化的研究

采用CuO为催化剂对臭氧氧化垃圾渗滤液水质变化进行了研究.结果表明:CuO对臭氧氧化垃圾渗滤液反应具有明显的催化作用,最佳催化剂投加量为0.7g/L;BOD5/COD的研究表明臭氧氧化提高了垃圾渗滤液生物降解性;UV254研究显示催化剂存在条件下臭氧氧化可以使废水中不饱和有机物和芳香族化合物快速分解;三维荧光光谱(Excitation-Emission Matrix,EEM)分析结果表明垃圾渗滤液中含有较多类富里酸物质,臭氧氧化后类富里酸物质减少,并产生了新的有机物峰;臭氧氧化作为生物处理的预处理手段时,催化剂的加入能够加快反应速度,缩短反应时间,减少臭氧使用量.