Selective flotation separation of plastics by chemical conditioning with methyl cellulose

The floatability of seven plastics (POM, PVC, PET, PMMA, PC, PS and ABS) in the presence of methyl cellulose (MC) and separation of plastics mixtures were investigated in this paper. It was found that the seven plastics can be separated into three groups by using the wetting agent MC. Group one includes POM and PVC. They are depressed at very low MC concentrations. Group two, including PET, PMMA and PC, has an intermediate floatability. Group three (ABS and PS) has a high floatability. They are almost not depressed within the given MC concentration range. In order to understand the mechanism of selective flotation of plastics and the chemical conditioning process, surface chemical factors, such as wettability of plastics and surface tension of flotation medium, and gravity factors, such as particle density and shape, were studied. It was found that the depressing effect of MC on plastics is ascribed mainly to its adsorption on the plastics surfaces. The MC molecules absorbed on plastics expose some of their polar groups oriented towards the aqueous phase, hence making the plastics surfaces hydrophilic. In addition, flotation selectivity for the plastics is dominated not only by wettability of plastics, but also by particle size, density and shape.     

卷烟厂综合废水处理及其实效

介绍了卷烟厂废水来源及处理工艺,分析了废水处理后的效果。     

济源钢铁厂混料系统废气及其治理

对济钢混料系统废气的来源及特性进行论述。采用水雾除尘器加以治理。该除尘器具有投资少操作简便,运行可靠,除尘效果稳定的特点。     

马铃薯淀粉生产废水综合利用技术研究

将马铃薯淀粉生产中的蛋白液通过蛋白提取和茵细胞提取技术,制成饲料蛋白,从而降低马铃薯淀粉生产废水中的有机物含量,减轻废水对环境的污染,且得到利用价值高的饲料蛋白,实现淀粉生产废水的循环利用.该技术解决了淀粉生产废水污染水环境这一制约马铃薯淀粉产业发展的瓶颈问题,实现节约水资源和循环利用水的目的.     

MBR污水处理技术在炼油污水中的应用

膜生物反应器（MBR）是膜技术和污水生物处理技术相结合的污水处理新工艺。金陵分公司污水处理场新建一座MBR处理装置，处理量为250t／h，自2005年11月正式投用，至今已连续运行一年的时间。该装置对炼油污水COD、油、硫、酚、氨氮、浊度的平均去除率分别稳定在80％、60％、100％、98％、90％、99％以上。为炼油污水回用创造了条件。     

白云石灰乳处理含铅废水的研究

经过多次试验证明了利用白云石灰乳处理含铅废水，既可以中和废水中的酸，又可以使铅离子形成沉淀并通氢氧化镁的吸附作用进一步去除废水中铅，达到国家规定的排放标准，本方法操作方便，投资省，成本低，处理效果好。     

废旧塑料的综合利用

综合利用废旧塑料,解决"白色污染",已成为全球的研究热点。从废旧塑料的直接利用、改性利用、热分解、与煤共液化等几个方面综述了废旧塑料的综合利用途径,其中废旧塑料与煤共液化处理技术很有发展前途,将成为今后研究的新热点。     

S—P降解塑料耐水性能改善初探

本文探讨了交联剂甲醛、乙醛、乙二醛、Ｃｕ＾２＋、Ｆｅ＾３＋、Ｚｎ＾２＋、Ｍｇ＾２＋对交联Ｓ－Ｐ膜耐水性能的影响。实验结果表明：经Ｆｅ＾２＋，乙二醛交联的Ｓ－Ｐ膜，其耐水性能优于其它膜。     

废旧家用电器回收再利用技术研究

介绍了国内外废旧家电的回收利用状况、处理方法和工艺流程,重点介绍了废旧电视机、冰箱、空调器和洗衣机的处理工艺和废塑料的再生利用,并针对我国实际提出了相应的措施和办法。     

污水处理场废渣的减量和资源化

分析了一些油厂污水处理场废渣量大，难处理、废渣脱水效果差和焚烧最终处理费用高等问题，对池底油泥、浮渣和剩余活性污泥三种废渣分别提出了减污措施，确定了按质分流收集、脱水处理和资源化方案，并论证了用炼油厂延迟焦化装置的焦碳塔直接回炼痈水浮渣及油泥以取代焚烧处理法的可行性和工业化试验结果。