摘要:

In a dispute over the construction of a wastewater treatment plant, a Texas appellate court ruled that the consent of the city of Lucas was not required before the North Texas Municipal Water District and the cities of Plano, Richardson, Allen, and McKinney could construct and operate the plant within the city's corporate limits or in its extraterritorial jurisdiction.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02883.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

The participants in this roundtable discuss the key elements of the Tax Reform Act of 1986 and its major effects on water utilities.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02887.x

出版商:Wiley    

年代:1987

数据来源: WILEY

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02888.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

This article recounts the successful strategies implemented by the city of Waco, Texas, to improve the quality of its raw water reservoir. The control of taste‐ and odor‐causing blue‐green algae was a recurring problem until the water utility began to inject compressed air into the reservoir to cause destratification. This practice has successfully controlled the growth of algae, thereby simplifying treatment processes. Watershed management in combination with routine sampling and analyses further protects the quality of the raw water that serves the city.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02889.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

Guidelines are given for planning and implementing a structured maintenance program for water treatment plants. Both tangible and intangible benefits that result in less costly and more efficient operations are discussed. Such programs are applicable to large utilities that have the resources to invest in computer‐based systems as well as small utilities that can use manual systems for recordkeeping.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02890.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

The discovery of contamination of the potable groundwater supply on the island of Oahu aroused public concern in the early 1980s. Pesticides used in growing pineapple and pipeline spills of aviation fuels caused several essential wells to be taken out of service. Federal and state officials took immediate action to meet the crisis and developed long‐term strategies to address public health concerns. The state legislature mandated closer reporting on the sale and distribution of pesticides and took other steps to strengthen the authority of state environmental officials. From this experience, the authors outline several measures other water utilities can take to forecast or meet similar contingencies.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02891.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

Fredericton, N.B., maintains 23 active wells that serve as the city's raw water source. Many of these wells have manganese concentrations far in excess of the 0.05 mg/L level recommended by the Canadian drinking water guidelines. An investigation showed that the wells could provide the city's drinking water if treatment for the removal of manganese was installed. After performing pilot studies, the city chose a chlorination‐filtration system for removing the manganese.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02892.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

Sequential air stripping and activated carbon adsorption were used for removing trichloroethylene (TCE) and carbon tetrachloride (CT) from a groundwater containing a high background level of organic carbon. Although both compounds were effectively removed by either process, TCE was more amenable to removal by adsorption, whereas CT was more amenable to removal by stripping. Background levels of organic carbon were found to significantly affect adsorption of both TCE and CT, reducing observed sorbent loadings.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02893.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

Suffolk County, N.Y., has examined its groundwater for agricultural and organic contaminants since 1978. Recent discoveries of specific chemicals in private wells increased the concern over contamination and spurred a study to determine a cost‐effective system for removing agricultural chemicals from groundwater. Tests of cellulose acetate; spiral‐wound, thin‐film composite; and hollow fiber membranes showed that reverse osmosis should be considered for pesticide and organics removal. Pilot tests should be conducted on in situ water to assure proper process design.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02894.x

出版商:Wiley    

年代:1987

数据来源: WILEY

摘要:

Pilot‐plant tests of two treatment methods—activated alumina and ion exchange—for removing arsenic from drinking water were evaluated at the Fallon, Nev., Naval Air Station (NAS). The arsenic concentration was 0.080‐0.116 mg/L, exceeding the 0.05‐mg/L maximum contaminant level. Although the valence of arsenic was not determined, the prechlorination process and test results suggest it was probably arsenic V. Chlorinated drinking water from the NAS was used for evaluating the efficacy of treatment under several different conditions. The activated alumina and ion exchange systems were operated through three different loading and regeneration cycles each. The major water quality factors affecting the removal of arsenic by these methods were: pH of feedwater, arsenic concentration, sulfate concentration, and alkalinity. The major operational factors affecting removal were: flow rate, down time, and media clogging. Capital and operating costs for arsenic removal are estimated for the activated alumina method at optimum pH (5.5) for each of the three small community systems drawing water from the same aquifer. In addition, several containers of the regeneration waste were used for a special study to characterize, dewater, and render the waste nontoxic for disposal in a sanitary landfill.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1987.tb02895.x

出版商:Wiley    

年代:1987

数据来源: WILEY