Performance of hybrid constructed wetland systems for treating septic tank effluent

The integrated wetland systems were constructed by combining horizontal-flow and vertical-flow bed, and their purification efficiencies for septic tank effluent were detected when the hydraulic retention time （HRT） was 1 d, 3 d, 5 d under different seasons. The results showed that the removal efficiencies of the organics, phosphorus were steady in the hybrid systems, but the removal efficiency of total nitrogen was not steady due to high total nitrogen concentration in the septic tank effluent. The average removal rates of COD （chemical oxygen demand） were 89%, 87%, 83%, and 86% in summer, autumn, winter and spring, respectively, and it was up to 88%, 85%, 73%, and 74% for BOD5 （5 d biochemical oxygen demand） removal rate in four seasons. The average removal rates of TP （total phosphorous） could reach up to 97%, 98%, 95%, 98% in four seasons, but the removal rate of TN （total nitrogen） was very low. The results of this study also indicated that the capability of purification was the worst in winter. Cultivating with plants could improve the treated effluent quality fTom the hybrid systems. The results of the operation of the horizontal-flow and vertical-flow cells （hybrid systems） showed that the removal efficiencies of the organics, TP and TN in horizontal-flow and vertical-flow cells were improved significantly with the extension of HRT under the same season. The removal rate of 3 d HRT was obviously higher than that of 1 d HRT, and the removal rate of 5 d HRT was better than that of 3 d HRT, but the removal efficiency was not very obvious with the increment of HRT. Therefore, 3 d HRT might be recommended in the actual operation of the hybrid systems for economic and technical reasons.     

High nitrogen removal from wastewater with several new aerobic bacteria isolated from diverse ecosystems

Introduction The presence of nitrogenous substance has attracted attention because of the role of nitrogen in eutrophication of receiving waters. Denitrification is the ability of bacteria to use nitrogen oxides (NO3- and NO2-) as electron acceptors produ…     

微纳米气泡改善太湖入湖河道水质的工程实例研究——苏州南北华翔河水质改善工程为例

太湖入湖河道,在各级政府及部门的努力工作下,经过点源治理、截污、清淤、生态修复等综合手段治理,水质逐年好转,但还存在很大的提升空间,本研究采用微纳米气泡气液分散系统,对人湖河道水体进行原位净化处理,结果表明,CODMn、氨氮、总磷的平均去除率分别为36．8％、42．4％,49．1％。入湖水质达到国家地表水Ⅱ-Ⅲ类标准。     

水中的环境内分泌干扰物

环境内分泌干扰物能通过生物富集作用进入生物体内,对生物和人体的内分泌机能造成影响。介绍了环境内分泌干扰物的定义、作用机理及特性。重点阐明了水中环境内分泌干扰物的检测,分布及去除。提出纳滤去除水中环境内分泌干扰物必将成为今后的研究方向。     

活性炭去除水中余氯的研究

通过对5种不同活性炭的去除余氯量实验、余氯穿透实验以及化学反应产物Cl-的质量平衡数据,探讨了活性炭去除余氯的性能和机制.活性炭去除余氯是吸附与化学反应共同作用的结果.活性炭与水中余氯接触后的初期,去除余氯以吸附作用为主;达到吸附平衡后,余氯浓度继续下降则是由于化学反应的作用.接触时间越长、余氯初始浓度越高、pH较低,活性炭去除余氯量越大.由Cl-的生成量可以确定化学反应去除余氯量是余氯总去除量的一部分;接触时间越长,活性炭剂量越大,化学反应去除余氯量占余氯总去除量的比例越高.使用粒径<180目活性炭进行余氯去除实验,吸附容量在1～2h即达到饱和.活性炭对余氯吸附量(2h的余氯去除量)的大小与其苯酚值排行相同.苯酚值及碘值较高的煤质炭与余氯有较强的化学反应,果壳炭其次,而椰壳炭的化学性相对稳定.     

C/N及氮源形式对潜流式人工湿地脱氮效果的影响

研究了C/N及氮源形式对潜流式人工湿地脱氮效果的影响.结果表明,当潜流式人工湿地进水C/N由2.0增大到6.0时,总氮的去除效率由45%提高到70%;而当进水C/N由6.0增大到14.0时,总氮的去除效率仅由70%提高到85%,提高的幅度相对较小.潜流式人工湿地对总氮的去除效率随NH 4 -N/TN的增加而降低,随着NO-3 -N/TN的增加而提高.     

造纸废水处理技术应用及研究进展

介绍了造纸废水处理技术的应用现状及研究进展,总结了物理法、物理化学法、生物法、生态法和联合法对造纸废水COD等的去除效果及运行状况.提出:联合法是处理造纸废水的最佳方法;联合法高效率的充分发挥需要新型混凝剂的开发、微生物培养等技术的更新与支持.     

人工湿地中氨化细菌去除有机氮的效果

人工湿地去除有机氮主要由于氨化细菌的作用.为了了解人工湿地中氨化细菌去除有机氮的效果,对人工湿地基质中5株氮化细菌进行了初步鉴定,比较了不同氨化细菌去除有机氮的效果,氨化细菌去除有机氮的量通过其生成的NH4< >-N来衡量.结果表明,芽孢杆菌属(Bacillus)、假单胞菌属(Pseudomonas)为人工湿地中氧化细菌的优势菌属;氨化细蒲-1、氨化细菌-2及氨化细菌-5对有机氮的去除效果相对较好,分别达到46.2%、49.4%和52.6%.添加沸石对玄除氨氮有明显效果,从而能够提高有机氮的去除率.     

网络版论文摘要

水蕹菜、生物刷改善池塘水环境效果试验;白腐真菌J610-D对染料脱色的影响因素研究;流化床粉煤灰合成分子筛的研究;WT-FG生物法对垃圾渗滤液中双酚A的去除效果;     

不同填充率对移动床生物膜反应器的产泥性能影响研究

研究了不同填充率下（10%～70%）移动床生物膜反应器的生物膜特征和处理效果,以及填充率与污泥产率的关系。结果表明：随着填充率的增加,填料上生物膜厚度逐渐减少,反应器中附着微生物浓度逐渐增加;污泥产率因填充率不同而有很大差异,同一个反应器内污泥产率随填充率的增加而减少;在进水COD为400 mg/L、NH⁺₄-N为40 mg/L、水力停留时间为12 h条件下,不同填充率下COD去除率均可达到94%以上,NH⁺₄-N去除率达到97%以上。