利用啤酒废酵母提取核糖核酸的研究

本介绍了稀盐法提取啤酒废酵母中核糖核酸的原理及工艺。该方法具有效果好、操作费用低、减少污染、工艺简单等优点。     

微絮凝过滤用于含油废水处理研究

以兰化303厂雨排污水为例，提出了微絮凝过滤处理合乳化油废水的处理工艺。通过实验，肯定了其良好的除油效果，油的去除率可达80％左右，并对主要影响因素进行含水油浓度、滤速、絮凝剂种类和投加量、反冲洗方法等进行了分析讨论。     

纳米二氧化锆的制备及其对对硝基氯苯的降解

用流变相反应法合成前驱物苯甲酸氧锆,通过元素分析,红外光谱,差热分析(DTA)和热重分析(TG)确定了前驱物的组成为ZrO(C6H5COO)2.2H2O.苯甲酸氧锆在氮气气氛下于700℃分解1.5 h得到高纯度纳米二氧化锆,属六方晶系呈球形,平均粒径约为20 nm.以该ZrO2为光催化剂,对对硝基氯苯进行光催化氧化,考察了ZrO2的加入量、对硝基氯苯的起始浓度、溶液pH值等对对硝基氯苯降解率的影响.在ZrO2加入量为0.75 g.L-1、对硝基氯苯起始质量浓度为30 mg.L-1、溶液pH值为7、光照时间为90 m in的条件下,对硝基氯苯的降解率为98%.     

Effects of Micronutrient Niacin on Treatment Efficiency of Textile Wastewater

0 IntroductionMioclroogincuatlri pernotsce pslsaeys afo vrer wyais tmepwoarttaernt t rroelaetmine nbti- .A widerange of micronutrientsis required byactiva-ted sludge[1-5]. Adequate trace nutrient concentra-tions ,including metal ions and vitamins , are re-quiredtosupport all the genera presentinthe activa-ted sludgetreatment systemfor a diverse communityto survive. The lack of specific nutrients may resultin an unbalanced mixed culture,leading to poor-quality effluent , reduced treatment effic…     

Landfill leachate treatment by MBR： Performance and molecular weight distribution of organic contaminant

A membrane bioreactor (MBR) with an air-lift bioreactor and gravity flow is applied to treating landfill leachate. More than 99% of BOD5 (biochemical oxygen demand for five days) removal effi-ciency is achieved with less than 35 mg/L of BOD_5 in the effluent at less than 1.71 kg BOD5/m~3·d of BOD_5 loading rate. When DO (dissolved oxygen) is maintained at the range of 2.3―2.8 mg/L and the loading rate of NH_4~ -N (ammonium nitrogen) is kept at 0.16― 0.24 kg NH_4~ -N/m~3·d, the NH_4~ -N in the effluent is less than 15 mg/L. However, compared with high removal rates of BOD_5 and NH_4~ -N, the removal effi-ciency of soluble chemical oxygen demand (SCOD) varies between 70% and 96%. The investigation of molecular weight (MW) distribution has been carried out by the gel permeation chromatography (GPC) so as to understand the fate of organic matters in the MBR treating of landfill leachate. Results indicate that organic matters of the landfill leachate are composed of a high MW fraction (MW of the peak, MWp = 11480―13182 Da) and a low MW fraction (MWp = 158―275 Da). The high MW fraction is not biode-gradable, but can be decreased with microfiltration membrane. The most of the low MW fraction is bio-degradable, but the residue of the low MW fraction is able to permeate through the membrane, thus re-sulting in high SCOD in the effluent of the MBR.     

铅对羊角月芽藻的毒性及吸收作用的研究

本文作者研究了铅对淡水绿羊角月芽藻的毒性．０．０－３８．５ｐｐｍ的ＰｂＣｌ２促进羊角月芽藻的生长；ＰｂＣｌ２高于３８．５ｐｐｍ则抑制其生长，并且降低了细胞内叶绿素ａ的含量，提高了膜透性和过氧化物酶活性，关角月芽藻能大量吸收 并富集铅。     

水面栽培蓄菜—多花黑麦草净化浸出油厂废水初步研究

在进行植物选择性试验后，借助于人工基质，将陆生植物蕹菜，多花黑麦草进行水面栽培，漂浮于浸出厂排放的废水中，通过中试研究后应用于大塘试验，以ＣＯＤｃｒ，ＤＯＳ５为指标，观察蕹菜对废水的净化效果。     

以DO作为SBR法处理工业废水反应时间的控制参数

根据有机物降解过程中COD与DO的相关关系，进行了以DO作为SBR法处理两种工业废水反应时间控制参数的研究，结果表明，两种工业废水的DO具有相同的变化规律，当有物达到难降解程度时，DO迅速大幅度升高，可以此作为停止暴气的控制信号，实现在线控制SBR反应时间的目的。所以提出以DO作为SBR反应时间的控制参数，对于保证出水水和减少运用费用有重要意义。     

废水深度氧化过程(AOP)中的自由基

对废水的深度氧化，包括光化学氧化，超声波氧化过程中自由基的种类、捕获技术与氧化方式进行了简述。