Abatement of waste gases and water during the processes of semiconductor fabrication

The purpose of this article is to examine the methods and equipment for abating waste gases and water produced during the manufacture of semiconductor materials and devices. Three separating methods and equipment are used to control three different groups of electronic wastes. The first group includes arsine and phosphine emitted during the processes of semiconductor materials manufacture. The abatement procedure for this group of pollutants consists of adding iodates, cupric and manganese salts to a multiple shower tower ( MST ) structure. The second group includes pollutants containing arsenic, phosphorus, HF, HCI, NO2, and SO3 emitted during the manufacture of semiconductor materials and devices. The abatement procedure involves mixing oxidants and bases in an oval column with a separator in the middle. The third group consists of the ions of As, P and heavy metals contained in the waste water. The abatement procedure includes adding CaCO3 and ferric salts in a flocculation-sedimentation compact device equipment. Test results showed that all waste gases and water after the abatement orocedures oresented in this article passed the discharge standards set by the State Environmental Protection Administration of China.     

Control of arsenic Pollution from waste gases during fabrication of semiconductor

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系统介绍了有关防止船舶垃圾污染的国际公约及其国内法律规定；并对加强船舶垃圾管理工作提出了几点建议。     

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2000年3－11月对小窑湾水域质量进行了9航次10个指标的海上调查，结果表明该水域质量符合国家一类标准。叶绿素a值夏季高于冬季，IN值冬季高于夏季，COD值4、5、6月均值高出其他月份均值43个百分点，IP值上半年高于下半年。海区营养属贫脊型。同时揭示了高密度双壳贝类浮筏养殖对海区水质的负影响较小，该海域养殖贝类的死亡主要是因饥 饿引发的贝体较弱，抗病力较差。     

美军三大自然环境试验中心

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高效生物脱氮途径短程硝化——反硝化

本文对短程硝化--反硝化生物脱氮技术的研究和应用进行了简要综述,并指出了该技术的特点和应用价值.     

金属振动塑性加工中体积效应的机理分析

基于应变叠加原理的基本思想.阐释了金属振动塑性加工平均应力减小的原因,给出了体积效应机理的数学描述.     

Purification of AS-CMP effluent by combined photosynthetic bacteria and coagulation treatment

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M—铁氧体对印染废水催化脱色试验研究

本文介绍了用含不同组分的铁氧体(M-铁氧体)作为催化剂,对印染废水进行催化空气氧化脱色的试验研究.实验发现Ni-铁氧体对不溶性还原染料废液有较好的催化脱色能力,脱色率通常可达90％以上.红外光谱分析结果表明,Ni-铁氧体参与的不溶性还原染料废液的催化脱色反应是通过将染液中的助剂保险粉彻底氧化,从而使染料转化为不溶性沉淀物被分离而完成的.     

应用油团聚技术洁净烟煤的主要影响因素研究(一)

介绍了油团聚(SGHFF)技术脱除烟煤灰分的过程。经过四步浮选后,灰分的去除率可达到86.8％;探讨了影响油团聚技术过程的主要因素,为洗煤厂及煤矿的细煤泥的处理及解决环境问题提供有效途经。