Removal and desorption of chromium in synthetic effluent by a mixed culture in a bioreactor with a magnetic field

Two chromium removal experiments were performed in bioreactors with and without a magnetic field under the same conditions.The release of the chromium present in the biomass was tested in two experiments one with the initial pH of the medium and one with pH 4.0.The objective was to remove Cr(Ⅵ) and total Cr from the effluent,this was carried out by placing biological treatments of synthetic effluent contaminated with 100 mg/L of Cr(Ⅵ) in a bioreactor with neodymium magnets that applied a magnetic field(intensity85.4 mT) to the mixed culture.The removal of Cr(Ⅵ) was approximately 100.0% for the bioreactor with a magnetic field and 93,3% for the bioreactor without a magnetic field for9 hr of recirculation of the synthetic effluent by the bioreactor.The removal of total Cr was61.6% and 48.4%,with and without a magnetic field,respectively;for 24 hr.The desorption of Cr(VI) in the synthetic effluent was 0.05 mg/L,which is below the limit established by Brazilian legislation(0.1 mg/L) for the discharge of effluent containing Cr(Ⅵ) into bodies of water.The results obtained for the removal of chromium in synthetic effluent suggested that there was no significant influence on the viable cell count of the mixed culture.The desorption of Cr(Ⅵ) in synthetic effluent after bioadsorption of chromium by the mixed culture in the process of removal of chromium in bioreactors with and without a magnetic field was not significant in either of the experiments with different initial pHs.     

膜、柱串联固相萃取-高效液相色谱法测定水中多环芳烃(PAHs)的研究

建立了用膜-柱串联固相萃取(SPE)技术,甲醇和水作为流动相进行梯度洗脱,紫外和荧光检测器串联的高效液相色谱法(HPLC)分析水中EPA优先监控的16种PAHs的方法.     

用液相催化法和脱硫除尘器脱除烟气中SO_2

在由旋风水膜和两块旋流塔板组成的处理气量为７５０ｍ￣３／ｈ的二级脱硫除尘器中，进行了用含催化剂Ｍｎ￣（２＋）的水溶液吸收ＳＯ_２的扩大试验。结果表明，在确定的条件下，脱硫率达到７３％，板效率为０．２５～０．２８。在同一设备中同时完成除尘与脱硫过程，设备投资少；以水为吸收剂，运行费用低；中性条件下吸收，长期运转不结垢，可靠性高。     

关于电子废物资源循环利用的思考

论述了我国电子废物的产生及污染现状,分析了日本、欧美等发达国家促进电子废物循环利用的对策,提出了我国电子废物循环利用的建议。     

炼油污水气浮絮凝处理中试

气浮絮凝是炼油污水处理工艺中重要的一步 ,它是确保炼油污水生化处理顺利运行的关键 ,而开发和筛选优良的絮凝剂则又是提高气浮处理效果的保证。采用无机—有机复合絮凝剂进行炼油污水的中试试验 ,通过一系列条件试验 ,确定了复合絮凝剂投药剂量、投药间隔时间和投药方式 ,取得了令人满意的试验效果 ,CODCr的去除率 5 5 % ,石油类去除率 >75 % ,为后续的生化处理提供了合格的水质     

草履虫──针杆藻群落对混合印染废水净化作用的条件实验

本文对混合印染废水的静态净化过程，进行了生物群落观察和条件实验。发现废水净化初期以大量细菌和草履虫（以 Ｐ． Ｃａｕｄａｔｕｍ为主）繁殖为特征，同时伴生着少量浮游藻类。随着净化过程的进行，细菌和草履虫数量下降，以针杆藻（以 Ｓ． ａｕｃｓ为主）为建群种的浮游藻类群落占优势。化学分析表明，净化作用与温度、光照条件及废水起始浓度有关。     

城市垃圾污染防治对策探讨

从城市拉圾产生的机制入手，分析了城市垃圾污染产生的原因，并对目前所采取的主要处理方法人季简要评述，在此基础提出了实现城市垃圾最小量化，推动垃圾资源化产业、提高垃圾无害化处理水平，中化监督管理等几点城市垃圾污染防治的对策。     

循环流化床锅炉对环境保护的意义

重点论述循环流化床锅炉对环境保护的特殊贡献。阐述了我国大气污染现状及防治对策 ;循环流化床锅炉工作原理及主要特点 ;循环流化床锅炉脱硫机理 ;循环流化床锅炉降低 NOX排放的机理等问题。     

液体化工罐区静电产生的原因及防范措施

对液体化工罐区静电产生的原因及可能产生的严重危害性做了详细的分析,并提出了防范措施.     

延安炼油厂第四循环水场冷却塔设计

简要介绍了延安炼油厂冷却塔的塔型选择及设计计算，提出对大型逆流式冷却塔的设计建议