摘要:

While alternative methods for measuring filter performance such as particle counters and monitors are increasing in importance, the turbidity measurement continues to have a significant place in water plant operations. All techniques have limitations and, consequently, no single method can provide all the answers to monitoring filter performance. In the future, many systems will need to use a combination of measurements. This article describes the turbidity measurement and the proper sampling and measurement techniques needed to analyze high‐quality filtered water as mandated by US Environmental Protection Agency regulations.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1994.tb01291.x

出版商:Wiley    

年代:1994

数据来源: WILEY

摘要:

If a turbidity measurement is made for regulatory purposes, the reading should be reasonably close to that obtained if the sample had been tested at any other location where turbidity measurements are made for this purpose. To achieve this industry‐wide agreement, three factors must be considered: the design of the instruments, the material used to calibrate the instruments, and the technique used to make the measurement.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1994.tb01292.x

出版商:Wiley    

年代:1994

数据来源: WILEY

摘要:

The percent composition calculation has several applications in the water supply field. For example, it can be used to determine the resulting concentration when two solutions are blended. It also can be used to determine the percent solids concentration of sludges that are blended. The percent composition calculation is useful in compost blending calculations, too.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1994.tb01293.x

出版商:Wiley    

年代:1994

数据来源: WILEY

摘要:

After maintenance work is performed on an elevated tank, the tank must be sterilized. The initial fill water for sterilizing is a strong chlorine solution, unsuitable for drinking. Loss of system pressure during the fill period could cause backflow into the drinking water distribution system, creating a serious threat to public health. This article lists materials and construction information for a portable backflow prevention device and cart.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1994.tb01294.x

出版商:Wiley    

年代:1994

数据来源: WILEY

摘要:

This month's question concerns water storage and capacity guidelines for avoiding water use restrictions and low‐pressure complaints during peak demand times. The answer states that a water supply should have a minimum peak flow capacity of 120 gallons per hour per single family residence, plus an allowance for fire protection. The article also discusses sizing storage and pumping facilities to meet system demands and to avoid low quantity and pressure problems during periods of peak demand. The article recommends that design water pressure should be maintained at a minimum of 35 psi and should never drop below 20 psi. A map is included of the amount of water used for water supplies by state in gallons per capita, per day.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1994.tb01295.x

出版商:Wiley    

年代:1994

数据来源: WILEY