摘要:

This article reviews provisions of the Safe Drinking Water Act which deal with maximum contaminant levels (MCLs) for trihalomethanes (THMs), outlines sampling procedures for THMs, describes procedures for determining quarterly and quarterly average total trihalomethane (TTHM) levels, and briefly discusses alternative treatment processes for reducing TTHM levels. Alternative treatment methods include the use of chloramines, chlorine dioxide, improved clarification, alteration in the chlorine addition point, and use of powdered activated carbon seasonally or intermittently.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1983.tb00084.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

This article describes the problem of copper oxide deposits which occurred in that portion of a municipal water supply where the water was of medium hardness and not softened during water treatment procedures. Customers complained of blue‐green deposits on plumbing fixtures, lavatories, bathtubs, and shower stalls. The copper oxide deposits were found both in new homes utilizing a water‐softening unit and in new homes without softening units. To solve the problem, the water utility recommended that customers who had installed water‐softening units either remove the units or bypass them for three to six months to allow a protective scale coating to build up in the newly installed pipes.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1983.tb00081.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

This article defines and illustrates various cross‐connection terms, including potable water, nonpotable water, backflow, back pressure, backsiphonage, continuous pressure, and cross connection. The article is part one of a series aimed at guiding operators in the control of cross‐connection. Parts II and III appeared in the February and March 1983 issues of OpFlow.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1983.tb00083.x

出版商:Wiley    

年代:1983

数据来源: WILEY

摘要:

Utilities that use the lime‐soda ash process to soften water frequently receive bulk shipments of granular lime in the form of calcium oxide (CaO) in large rail cars. Not all of the lime product received is usable calcium oxide. To determine the percentage of available CaO in the product, core samples should be taken from at least eight different locations in the rail car in accordance with AWWA Standard B202‐77. This month's Gimmicks and Gadgets describes a core sampling device which provides an effective and inexpensive means of taking lime samples from rail cars. Materials needed and construction specifications are discussed.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1983.tb00085.x

出版商:Wiley    

年代:1983

数据来源: WILEY