摘要:

In his letter, Arthur T. Palin states that results obtained in the article “Determining Free Available Chlorine by DPD‐Colorimetric, DPD‐Steadifac (Colorimetric), and FACTS Procedures” by W.J. Cooper et al (JOURNAL AWWA July 1982) are misleading. Palin cites the following errors: the concentration of indicator used in the test for dissolved oxygen was about 90 times that of the standard method; previous tests have established that the FACTS test suffers from strong interference by nitrogen trichloride (NCl3), whereas DPD is free from such interference; Cooper et al were incorrect in stating that the DPD‐colorimetric procedure is unusable for distinguishing free from combined chlorine; and USEPA approval of the FACTS test for free chlorine is weakly based on the equivalency testing of a commercially available FACTS test kit. Cooper responds to Palin's statements by addressing the issues of dissolved oxygen interference, nitrogen trichloride, monochloramine interference, the FACTS procedure, and the USEPA equivalency testing.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05077.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

In this article, the author discusses the future of the water supply industry relevant to motivation, manpower, management, and money.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05078.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

A law limiting voter eligibility to landowning residents in certain special elections, including those creating water districts, did not violate either the state or federal constitutions, according to New York's highest court.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05080.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

In this month's “Face to Face,” US Senator Slade Gorton from the state of Washington discusses the role of AWWA and other nonprofit professional associations in the federal lawmaking process. Gorton is presently chairman of the Subcommittee on Toxic Substances and Environmental Oversight. Topics discussed include: development of environmental legislation; reliable sources of technical information for Congress; effective methods constituents can use to impact members of Congress; and methods for tax‐exempt organizations to assist Congress in developing sound, workable legislation. Gorton suggests that such organizations create the impression among members of Congress that they know what they are talking about and be backed by sound facts and experience.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05082.x

出版商:Wiley    

年代:1983

数据来源: WILEY

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05083.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

The scarcity of water resources of suitable quality for drinking water near some of the most rapidly growing coastal communities in Florida has made desalting a feasible means of using brackish groundwater for potable supplies in many areas. Reverse osmosis has proven to be the most satisfactory and widespread technique for development of these alternative sources of potable water.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05084.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

Fundamental technical and economic issues related to large‐scale reverse osmosis desalting facilities are discussed. When conventional water supply sources are scarce, developing sources that require dissolved‐solids removal is increasingly attractive as improvements are made in commercially available membrane devices.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05085.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

Florida's environmental standards on fluid waste discharge from power plants combined with restrictions on consumptive use of groundwater required the Gainesville Regional Utilities to treat and reuse cooling water for the Deerhaven power generating station. A method for treating and recirculating all cooling water was developed so that zero waste discharge was achieved.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05086.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

The challenge of designing and building a 94‐ML/d (25‐mgd) water treatment plant to meet new water quality standards was successfully accomplished by the Bridgeport (Conn.) Hydraulic Company. A constricted site located near a highway and several dwellings called for an aesthetic architectural solution as well as the use of unusual water treatment technology. A fast‐track design and construction program achieved the desired results within the time limit set by regulatory agencies at a cost below the original estimate.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05087.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

The formation of purgeable and nonpurgeable organic chlorine was evaluated as a function of the type and concentration of precursor material, the type and dosage of chlorine, pH, temperature, and ammonia concentration. The concentration of organic chlorine in a public water supply can be minimized by avoiding prechlorination, avoiding higher concentrations of chlorine than are necessary for good disinfection, using combined chlorine rather than free chlorine, maintaining a high pH, and withdrawing water from a source with a low concentration of precursor material and a cool temperature. Because the conditions that favor lower concentrations of organic chlorine are generally the same conditions that tend to reduce the efficiency of disinfection, careful consideration must be given to the adequacy of disinfection if efforts are made to reduce organic chlorine formation.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1983.tb05088.x

出版商:Wiley    

年代:1983

数据来源: WILEY