Environmental letters最新文献_第9页

Prevention of sewage pollution by stabilization ponds. 稳定池防止污水污染。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509437426

J S Lakshminarayana

{"title":"Prevention of sewage pollution by stabilization ponds.","authors":"J S Lakshminarayana","doi":"10.1080/00139307509437426","DOIUrl":"https://doi.org/10.1080/00139307509437426","url":null,"abstract":"Water is polluted when it constitutes a health hazard or when its usefulness is impaired. The major sources of water pollution are municipal, manufacturing, mining, steam, electric power, cooling and agricultural. Municipal or sewage pollution forms a greater part of the man's activity and it is the immediate need of even smaller communities of today to combat sewage pollution. It is needless to stress that if an economic balance of the many varied services which a stream or a body of water is called upon to render is balanced and taken into consideration one could think of ending up in a wise management programme. In order to eliminate the existing water pollutional levels of the natural water one has to think of preventive and treatment methods. Of the various conventional and non-conventional methods of sewage treatment known today, in India, where the economic problems are complex, the waste stabilization ponds have become popular over the last two decades to let Public Health Engineers use them with confidence as a simple and reliable means of treatment of sewage and certain industrial wastes, at a fraction of the cost of conventional waste treatment plants used hitherto. A waste stabilization pond makes use of natural purification processes involved in an ecosystem through the regulating of such processes. The term \"waste stabilization pond\" in its simplest form is applied to a body of water, artificial or natural, employed with the intention of retaining sewage or organic waste waters until the wastes are rendered stable and inoffensive for discharge into receiving waters or on land, through physical, chemical and biological processes commonly referred to as \"self-purification\" and involving the symbiotic action of algae and bacteria under the influence of sunlight and air. Organic matter contained in the waste is stabilized and converted in the pond into more stable matter in the form of algal cells which find their way into the effluent and hence the term \"stabilization pond\".","PeriodicalId":11979,"journal":{"name":"Environmental letters","volume":"8 2","pages":"121-34"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00139307509437426","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12310759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Locating nuclear power plants underground. 确定地下核电站的位置。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509435862

F M Scott

引用次数: 2

Particle sizing of arc smokes by forward light scattering. 前向光散射法测定弧烟的粒径。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509435809

P W Chan, O Apichatonon, C Y She

引用次数: 0

Ozone decay in irradiated smog chambers. 辐照雾霾室中的臭氧衰变。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509435828

M C Dodge, T A Hecht

引用次数: 4

Droplet size of cooling tower fog. 冷却塔雾滴大小。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509435821

T Rothman, J O Ledbetter

{"title":"Droplet size of cooling tower fog.","authors":"T Rothman, J O Ledbetter","doi":"10.1080/00139307509435821","DOIUrl":"https://doi.org/10.1080/00139307509435821","url":null,"abstract":"Fog from cooling towers causes problems of visibility and icing along roadways adjacent to the towers; moreover, the visible plume from the towers offers difficulty in that it is equated by much of the public with air pollution. It is desirable to know the size of the fog droplets in order to plan abatement procedures and to determine the airborne lifetimes of such fogs. The methodology involved capturing the droplets on slides coated with a vaseline-mineral oil mixture, making photomicrographs of the droplets, counting and sizing the droplets into eight droplet diameter increments; namely less than 5 mum, 5-10 mum, 10-20 mum, 20-40 mum, 40-60 mum, 60-80 mum, 80-100 mum, and greater than 100 mum. The resulting distribution was similar to that for natural fogs and clouds; i.e., it was bi-modal, the first mode at less than 5 mum containing the vast majority of the droplets, and the second at 20-40 mum. This study agrees with others that the size distribution of a fog in a saturated environment is continuously changing, with the smaller droplets tending to evaporate and the larger ones tending to grow, thus shifting the second mode toward larger sizes.","PeriodicalId":11979,"journal":{"name":"Environmental letters","volume":"10 3","pages":"191-203"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00139307509435821","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12417473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Lack of secondary intoxification by red tide poison in the American lobster Homarus americanus. 红潮毒素对美洲龙虾继发中毒的影响。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509435853

C M Yentsch, W Balch

引用次数: 9

Development of the solid waste resource. 固体废物资源化开发。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509435864

D L Klumb, E M Wells

引用次数: 0

The use of activable tracers in the evaluation of the performance of wastewater treatment plants. 活性示踪剂在污水处理厂性能评价中的应用。

Environmental letters Pub Date : 1975-01-01 DOI: 10.1080/00139307509435858

T F Craft, G G Eichholz