生物接触氧化—电絮凝工艺处理垃圾渗滤液研究

为了探索高效垃圾渗滤液处理工艺,采用生物接触氧化—电絮凝工艺处理垃圾渗滤液。试验结果表明,生物接触氧化—电絮凝工艺适于处理COD<5000mg/L的垃圾渗滤液,最高容积负荷可达6.56kgCOD/(m3.d),对COD去除率最高可达84.63%,平均BOD去除率可达91.25%,对NH4-N去除率最高可达86.13%,处理后的垃圾渗滤液可达到国家垃圾渗滤液二级排放标准。处理费用估算为10元/m3。     

Effects of benthic hydraulics on sediment oxygen demand in a canyon-shaped deep drinking water reservoir: Experimental and modeling study

Sediment oxygen demand (SOD) is a major contributor to hypolimnetic oxygen depletion and the release of internal nutrient loading. By measuring the SOD in experimental chambers using in both dissolved oxygen (DO) depletion and diffusional oxygen transfer methods, a model of SOD for a sediment bed with water current-induced turbulence was presented. An experimental study was also performed using near-sediment vertical DO profiles and correlated hydraulic parameters stimulated using a computational fluid dynamics model to determine how turbulences and DO concentrations in the overlying water affects SOD and diffusive boundary layer thickness. The dependence of the oxygen transfer coefficient and diffusive boundary layer on hydraulic parameters was quantified, and the SOD was expressed as a function of the shear velocity and the bulk DO concentrations. Theoretical predictions were validated using microelectrode measurements in a series of laboratory experiments. This study found that flow over the sediment surface caused an increase in SOD, attributed to enhanced sediment oxygen uptake and reduced substances fluxes, i.e., for a constant maximum biological oxygen consumption rate, an increased current over the sediment could increase the SOD by 4.5 times compared to stagnant water. These results highlight the importance of considering current-induced SOD increases when designing and implementing aeration/artificial mixing strategies.     

序批式缺氧-好氧工艺处理味精废水试验研究

味精废水经吹脱、稀释预处理 ,CODCr32 0 0mg/L、氨氮 170mg/L、总氮 40 0mg/L ,在CODCr负荷 0 6kg/m3 ·d下 ,接触氧化法和活性污泥法都能达到GB8978 96的排放标准。当负荷为 0 8kg/m3 ·d时 ,低浓度进水方式可以使出水CODCr接近处理目标 ,但出水CODCr排放总量增加。由于味精废水含有高浓度的硫酸盐 ,缺氧状态下 ,硫酸盐还原反应影响了反映硝化反应。味精废水自身碱度不足 ,必须投加充足的碱量 ,以避免硝化时 pH的下降。     

一种含油乳化液废水处理技术的工程应用

采用两极混凝气浮 生物接触氧化工艺处理金属加工行业乳化液废水。生产运行结果表明 ,CODCr平均去除率为 99 5 5 % ,油为 99 91% ,出水各项指标均达到污水综合排放标准     

污水中染料的生物毒性及其去除方法的研究

本文介绍了在实验室模拟条件下,利用蚕豆根尖的微核效应,分析了3种染料溶液及实际污水的生物毒性和它的去除方法。实验表明,这3种染料和实际污水都存在着生物毒性。在溶液 pH,温度,臭氧发生量一定条件下,3种染料溶液经臭氧氧化后,生物毒性去除率达56%以上,实际污水经臭氧处理后,生物毒性去除达31.09%。     

漂染废水水解——生物接触氧化——混凝处理

采用水解--生物接触氧化--混凝沉淀工艺处理，漂染废水中的主要污染物CODcr、BOD5、色度、SS和PH值都能达到《纺织染整工业污染物排放标准》（GB-4278-92）中一级标准。     

啤酒废水组合处理工艺的应用与工程实例

概述国内现阶段啤酒生产废水厌氧与好氧组合处理工艺的应用,同时对某厂利用EGSB＋接触氧化＋过滤组合工艺处理啤酒废水的实际应用进行了介绍,处理后排放废水水质达到景观环境用水标准（GB/T18921-2002）,处理啤酒废水费用为0.75元/m3,同时可产生沼气作为能源利用,具有一定的经济效益。     

水源水生物处理工艺启动中氨氮的去除

通过沉淀槽与生化槽串联的试验系统，分析了微污染水源水生物接触氧化处理工艺启动过程氨氮和亚硝酸盐氮的变化规律。研究结果表明，在无暴气条件下和曝气条件下，填料上硝酸盐细菌的生长均依赖于亚硝酸盐细菌转化氨氮为亚硝酸盐氮的过程。启动中氨氮去除效果趋于稳定的过程是两类硝化细菌在生长速率和转化能力上趋于稳定的过程。提供生化槽充足的曝光气量是保证填料上硝化细菌稳定生长，顺利完全启动过程的必要条件。     

受污染原水的弹性填料生物接触氧化处理挂膜试验研究

试验研究了水温、曝气强度和气水比等因素对YDT生物接触氧化池挂膜的影响。结果表明：生物接触氧化池挂膜受水温影响很大，水温越高，挂膜时间就越短，水温低于15℃自然挂膜难以成功。在挂膜期间，采用较小的曝气强度和气水比可缩短生物膜的成熟时间。对判断生物膜是否成熟的指示性参数－氨氮去除率和CODMn去除率进行了比较，认为用氨氮去除率作为判断生物膜成熟的批示性参数较适合。     

Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation

Ozonation has been widely applied in advanced wastewater treatment. In this study, the effect of ozonation on assimilable organic carbon （AOC） levels in secondary effluents was investigated, and AOC variation of different molecular weight （MW） organic components was analyzed. Although the removal efflciencies were 47%-76% and 94%-100% for UV2s4 and color at ozone dosage of 10 mg/L, dissolved organic carbon （DOC） in secondary effluents was hardly removed by ozonation. The AOC levels increased by 70%-780% at an ozone dosage range of 1-10 mg/L. AOC increased significantly in the instantaneous ozone demand phase, and the increase in AOC was correlated to the decrease in UV254 during ozonation. The results of MW distribution showed that, ozonation led to the transformation of larger molecules into smaller ones, but the increase in low MW （〈1 kDa） fraction did not contribute much to AOC production. The change of high MW （〉100 kDa and 10-100 kDa） fractions itself during ozonation was the main reason for the increase of AOC levels. Furthermore, the oxidation of organic matters with high MWs （〉 100 kDa and 10-100 kDa） resulted in more AOC production than those with low MWs （1-10 kDa and 〈1 kDa）. The results indicated that removing large molecules in secondary effluents could limit the increase of AOC during ozonation.