摘要:

This column provides news briefs and vignettes of the water industry as of December 1965.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01546.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

This article discusses the Chamber of Commerce of the United States (CCUS), specifically its water resources program. The principal objective of the chamber's water resources program is to encourage the optimum management of the nation's total water resources, as opposed to a particular local resource. Criteria is discussed for water management and use that will increase its yield and value as a resource for human survival and satisfaction.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01537.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

This article discusses the role of the consulting engineer in conducting studies of long‐range plant and revenue requirements and their probable date of maturity. The planning done by the consulting engineer balances these requirements and construction expenditures with available funds, and lowers “shock” rate changes to a minimum. In order to provide good customer service, every water utility must have sufficient revenue to cover all operation and maintenance expenses, depreciation, and fixed charges or return on investment. In addition, every utility should have sufficient surplus to finance ordinary capital additions from current earnings, and to attract capital necessary for its major expansion expenditures.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01538.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

The complex expansion of water systems has resulted in substantial adoption of instrumentation by the water industry. Modern instrument systems have made possible the surveillance and remote control of wells, treatment facilities, pumping stations, storage tanks, and transmission main valving, while rising labor costs have prompted water utility management to follow other industries in establishing some degree of automation and centralized control. This article provides examples of instrumentation for both production and distribution facilities that include the Dayton (Ohio) Miami River Plant, and the Pinellas County Water System in Clearwater, Florida.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01539.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

Where red‐water, taste, and odor problems persist in distribution systems and defy the conventional methods of correction, cleaning and cement‐mortar lining of the pipe will provide the solution to the problem. Cleaning and lining greatly improves the carrying capacity of old, tuberculated water mains. Hazen‐Williams coefficients in the problem area were raised from 30‐43 to an average of 115 for 6‐, 8‐, and 12‐inch pipe. This article discusses an effective troweling device that made these results possible, and improved the C value of reconditioning distribution grid mains in Philadelphia. The average C value of 115 for 6‐in. pipe was a C value of 25, a greater improvement over untroweled lining previously applied in Philadelphia.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01540.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

Impoundment sites must be carefully selected with consideration given to many factors, especially water quality. This article focuses on the relationship of natural soils and forest debris to the quality of overlying water in the initial years of impoundment. The article presents data from a study of the Howard A. Hanson multi‐purpose reservoir, located about 3 miles above the city of Tacoma, Washington, water intake (27 miles east of Tacoma) on the Green River in the Cascade Mountain foothills. The data demonstrate some of the associations between original reservoir soils and the overlying water.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01541.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

This article demonstrates how cationic and anionic polymers coagulate or flocculate (or both) dilute clay suspensions under controlled solution conditions. Because the concentrations of polymer required to destabilize dilute clay suspensions may be in the magnitude of a few micrograms per liter, an extremely sensitive and accurate method was developed by the authors for determining microquantities of residual polymer in the supernatant of the destabilized and settled clay suspensions to fully evaluate the polymer‐clay interactions. This method uses C14‐labeled polymers and liquid scintillation counting techniques.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01542.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

The objective of this study was to evaluate aerobic waste treatment plants as breeding sites for nematodes and to locate the unit processes and operations favorable for such breeding. The Urbana‐ Champaign (Illinois) Sanitary District waste treatment plant was chosen for this study. This plant uses the two processes, trickling‐filter and activated‐ sludge units, to treat the same domestic waste. This arrangement made possible a comparative evaluation of these two processes as nematode breeding sites. Furthermore, previous studies of the origin of the nematode population found in the Boneyard‐Saline Branch Drainage System were of assistance in estimating the relative contribution of nematodes discharged by the treatment plant. The nematode population at various locations within the treatment plant was monitored weekly from September 1962 to mid‐ September 1963.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01543.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

The discovery of S. montevideo in the water supply of a collective settlement in Galilee (Israel) prompted the investigators to examine for enteropathogens all those waters that could be considered suspect either because of their appearance (turbidity, particularly after inundations) or because unexplained enteritis cases occurred amongst the users of a given water. A total of 400 water samples were examined for the number of bacteria (colony count) and for the number of fecal Escherichia coli (complete test) according to standard methods. The samples were also tested for enteropathogens by centrifuging twenty milliliters of water at 2,000 rpm for 15 minutes. The deposit was cultured in a Mueller‐Kauffmann enrichment medium from which BGB plates were inoculated and suspicious colonies were identified by the usual biochemic and serologic methods. The isolated strains were submitted for confirming tests to the Israel Salmonella Center in the Central Laboratories at Jerusalem.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01544.x

出版商:Wiley    

年代:1965

数据来源: WILEY

摘要:

This article discusses the methyl orange test as a satisfactory laboratory and field procedure for determining free and combined chlorine in water samples. All reagents used in the test are stable at room temperature and may be prepared from readily available chemicals. The test may theoretically be used to measure chlorine of any concentration; curves have been prepared for concentrations of up to 5.0 mg/l, although precision deteriorates slightly at the higher concentrations. The only serious interference is from manganese and this can be corrected through the use of an arsenite modification.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1965.tb01545.x

出版商:Wiley    

年代:1965

数据来源: WILEY