Biological mine drainage treatment

Drainage from sulphur mines contains a high concentration of ferrous iron and it is strongly acidic. The mechanism of acid mine drainage formation was briefly explained. As a case study, successful measures taken at the abandoned Matsuo mine, Iwate Prefecture, Japan, for preventing the pollution in receiving rivers was presented in this paper. The measures consisted of the construction works against pollution sources and the construction of a drainage treatment plant in which Thiobacillus ferrooxidans oxidizes ferrous iron under a low pH condition, and produced ferric iron is removed by sedimentation. Then, a laboratory-scale fluidized bed reactor using anion exchange resin as attaching material for the bacteria was examined in order to improve the efficiency of biological oxidation of ferrous iron. More than 90% of oxidation had been maintained for 2 months at 1 h of HRT, which suggests that the size of the oxidation tank could be reduced.     

AEB反应器反硝化处理高浓度硝酸盐废水

采用缺氧膨胀床(AEB)反应器处理高浓度硝酸盐废水,研究了反应器的快速启动和挂膜特性,以及在反硝化连续流运行条件下对废水的处理效果。实验结果表明:采用自然挂膜方式,填料层从下至上生物膜厚度逐渐增加;AEB的快速启动8 d可完成,COD去除率由44.9%升至92.3%,NO_3~--N去除率由39.8%升至98.4%;稳定运行阶段(进水COD 4 628～5 548 mg/L、ρ(NO_3~--N) 1 339～1 505 mg/L),COD去除率稳定在95%左右,NO_3~--N去除率稳定在98%～99%,COD和NO_3~--N的容积负荷去除量最高可达27.8 kg/(m~3·d)和7.3 kg/(m~3·d)。     

偶氮染料废水的电解处理

用复极性固定床电解槽处理偶氮染料废水,在正交试验确定的原水ＣＯＤ２００ｍｇ／Ｌ、槽电压３０Ｖ、停留时间２ｈ、导电颗粒与绝缘颗粒体积比１：４的条件下,色度和ＣＯＤ去除率分别达到９９％以上和７８．４－９８．２％。     

THE STABILITY OF BLOCKS SUBJECTED TO PLUNGING WATER JETS

Laboratory observations were made on the stability of cubical blocks subjected to plunging water jets. The blocks were placed in a plunge basin at the base of a flip bucket. A dimensionless equation was derived and a nomogram was drawn to facilitate its solution. The results can be applied to determine the size of stones required to armor a plunge basin or scour hole.     

超重力技术及其在环保中的应用

超重力技术是一项新兴的强化传递过程的技术 ,应用在环保、化工、材料、能源等领域可以大大强化传递过程。介绍了超重力技术的作用原理、研究进展和在环保中的应用 ,以及应用超重力技术的 2种旋转填料床     

水解酸化-UASB-SBR组合法处理印染废水

根据印染废水的特性，提出了水解酸化－UASB－SBR组合法处理的处理方法。该不的实际应用表明，废水CDO用2500－4500mg/L降至80－150mg/L,BOD5，可由600－1000mg/L降至30-40mg/L，色度可由100－600倍降至50－60倍，该法具有以废治废，投资少，运用费用低，操作简单的特点。     

高速铁路基床病害研究

结合我国第一条高速铁路———秦沈客运专线 ,对高速铁路基床的受力状态和作用做了简要的论述。针对基床的受力情况作了土的动力三轴试验 ,得出了随着土饱和度的增大土的动强度会大大降低的结论 ,从而论证了基床表层防渗功能的重要性。分析了基床病害发生的机理 ,指出水渗入基床、造成土的动强度降低是高速铁路产生基床病害的根本原因。结合国外高速铁路的经验 ,指出采用强化基床表层是消除基床病害的根本措施     

MORPHOLOGICAL FEATURES OF SMALL STREAMS: SIGNIFICANCE AND FUNCTION1

ABSTRACT: Throughout the United States, land managers are becoming increasingly aware of the importance of small streams for a wide range of resource benefits. Where channel morphology is modified or structural features are added, stream dynamics and energy dissipation need to be considered. Unit stream power, defined here as the time-rate loss of potential energy per unit mass of water, can be reduced by adding stream obstructions, increasing channel sinuosity, or increasing flow resistance with large roughness elements such as woody root systems, logs, boulders, or bedrock. Notable morphological features of small streams are pools, riffles, bed material, and channel banks. Pools, which vary in size, shape, and causative factors, are important rearing habitat for fish. Riffles represent storage locations for bed material and are generally utilized for spawning. The particle sizes and distributions of bed material influence channel characteristics, bedload transport, food supplies for fish, spawning conditions, cover, and rearing habitat. Riparian vegetation helps stabilize channel banks and contributes in various ways to fish productivity. Understanding each stream feature individually and in relation to all others is essential for proper stream management. Although engineered structures for modifying habitat may alter stream characteristics, channel morphology must ultimately be matched to the hydraulic, geologic, and (especially) vegetative constraints of a particular location.     

焚烧在城市固体废弃物堆肥填埋中的配套应用

城市生活固体废弃物已严重污染了城市环境，影响了市容布貌，影响子投资环境，因此，焚烧作为城市生活固体废物的一种处理方法，已愈来愈受到人们的关注。本文将系统阐述焚烧的有关热工计算，焚烧工艺及焚烧装置，目的是给环保工作者在实际工程中以参考。     

不同煤矸配比脱硫试验分析

以一台130t／h循环流化床锅炉为研究对象，采用不同煤矸配比，以当地工业废渣为固硫剂，在不增加任何试验设备的情况下，进行炉内脱硫试验。结果表明，锅炉脱硫效果明显，试验取得了一定的成功。