摘要:

This reader writes to disagree with the authors of the article entitled “Coliforms in a Water Distribution System: A Remedial Approach” (JOURNAL AWWA, November 1983). The authors stated that “…chloramine disinfection was not able to control the coliform organisms in the distribution system.” The authors erred in not addressing the likelihood that cementing filters with post‐softening carbonate scale resulted in poor filtration and that their real problems began at the filters. Furthermore, excessively high pH deactivates the free chlorine residual. The authors respond to Brodtmann's charges by stating that upflow softening units can not quickly be converted to conventional clarification units without risking poorer bacterial removal.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05249.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

In this month's “Viewpoint,” Abel Wolman discusses his views on managing wastewaters and protecting drinking water. Past assessments and improvements in dealing with infectious diseases and organic and inorganic chemicals in water are reviewed. Wolman concludes that both the chemical and wastewater and water industries must take more responsibility for determining and controlling mutagenic and carcinogenic compounds. Furthermore, public opinion should also be given more serious consideration.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05250.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

The Public Utility Commission's (PUC's) use of a criterion other than fair value for measuring the value of a regulated gas and water utility's property for rate‐making purposes violated both statutory and decisional mandates, according to the Commonwealth Court of Pennsylvania.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05252.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

Jacqueline M. Warren, senior staff attorney of the Natural Resources Defense Council, expressed the concerns and goals of environmental groups during an interview with Executive Director David B. Preston on Sept. 2.1983. in the NRDC offices in New York City.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05255.x

出版商:Wiley    

年代:1984

数据来源: WILEY

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05256.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

Open storage reservoirs formed by earthen embankments may be classified as facilities with a high seismic hazard potential, especially if the surrounding areas have been heavily developed. A geotechnical evaluation of 12 open embankment reservoirs was undertaken in Seattle, Wash., to determine the safety and seismic stability of the facilities in the event of earthquakes.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05257.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

Experience in Portland, Ore., with old open storage reservoirs as well as a variety of covered storage facilities has evolved into a routine cleaning, maintenance, and protective program. Storage of chlorinated water in the open reservoirs in Portland's system requires periodic cleaning to prevent water quality deterioration, and protection of these reservoirs from the public is also important. The Portland Water Board has significantly extended the useful life of the aging facilities with these procedures.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05258.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

Providing cathodic devices that protect against corrosion in water storage tanks defers or, in some cases, eliminates the need to recoat submerged surfaces, making such systems economical over the long term. Some types of new anode materials have a design life of 10 to 20 years, whereas aluminum anodes must be replaced annually. Automatic electric current control systems are also available to compensate for fluctuating conditions, to measure the potential in the electrolyte, and to lower the electric consumption of cathodic protection systems.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05259.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

The cause of the failure of a new water storage tank to fill completely was investigated through computer modeling techniques. The analytic methods and the relevant data that were used to solve the problem are described. The source of the malfunction was found, and the tank now fills to its maximum level.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05260.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

The characteristics of various types of steel water storage facilities are described and illustrated to serve as guidelines for selecting appropriate tanks. A summary of the advantages and disadvantages of each design is included.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05261.x

出版商:Wiley    

年代:1984

数据来源: WILEY