摘要:

This overview of procedures and methods of coating industrial steel structures offers owners of water storage tanks guidelines for securing proper painting work. Methods for preparing the surface of the structure for coating, selecting an appropriate material, and applying and inspecting the coating are discussed.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05262.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

This article describes a procedure for either amperometric or potentiometric determination of iodine formed by the oxidation of iodide by chlorine dioxide, chlorine, chlorite, and chlorate. Either phenylarsine oxide or sodium thiosulfate can be used as the titrant. Sample pretreatment and pH adjustment are used to differentiate among the various chlorine species.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05263.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

The yield of chlorine dioxide (ClO2) is influenced by chemical conditions (e.g., initial chlorine concentration, alkalinity) and by reactor design (e.g., detention time, method for mixing chemicals). This article describes the design and operation of C1O2‐generating systems used by the Brussels' Intercommunal Waterboard. Improved reactor designs have increased C1O2yields from 65–80 percent to>95 percent of the theoretical yield.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05264.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

Processes in which oxidation is followed by removal of suspended solids can effectively remove soluble iron and manganese from water. Three common processes for removing iron and manganese are: (1) aeration‐filtration, (2) chlorination‐filtration, and (3) potassium permanganate‐manganese greensand filtration. This article describes these processes and presents results from a pilot study of chlorination‐filtration. The costs for oxidants in chlorination‐filtration are less than those for potassium permanganate‐manganese greensand filtration.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05265.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

Overland flow, an effective wastewater treatment process, can also be used for potable water treatment. Many groundwaters contain excessive amounts of ferrous iron that result in a water of poor aesthetic quality. The natural reaeration that occurs during overland flow oxidizes ferrous iron to the more insoluble ferric form. The resulting precipitate then settles on the slope. An existing overland‐flow treatment system in Salo, Finland, achieves 97 percent iron and manganese removal. A brief description of that treatment system is presented.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05266.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

A random selection of 186 water utilities was used for this study in which raw and finished water samples were collected from each facility five times throughout a year and analyzed for iron and aluminum by atomic absorption techniques. The water samples were categorized by the supply source (ground, surface, or a combination of both), the type of water (raw, finished, or untreated distribution samples), and the type of coagulation used in the treatment process (aluminum sulfate, ferric chloride, other coagulants such as cationic polymers, or no coagulant). The samples were also categorized according to the 10 US Environmental Protection Agency regions and 4 population categories. The results indicate that aluminum is more likely to exist in surface waters than in groundwaters and that there is a 40–50 percent chance that alum coagulation increases the aluminum concentration of finished water above its original concentration in the raw water.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05267.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

This report describes declining‐rate and constant‐rate systems for controlling flow through granular media filters. Several areas are identified that need to be researched in order for these control systems to be compared fairly.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05268.x

出版商:Wiley    

年代:1984

数据来源: WILEY