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<br /> <br />o <br /> <br />('-') <br /> <br />...... <br />~ Wastewater Treatment <br />~ <br />~ Many improvements in municipal and industrial wastewater <br />treatment have occurred in recent years, especially in the period <br />1965 to 1970. Even with this progress, there still remains a <br />need for further improvement in wastewater treatment to control <br />existing sources of pollution. There is also a significant need <br />for improved operation and maintenance of existing wastewater <br />treatment systew5. In the Las Vegas, Nevada area there is a need <br />to remove nutrients from municipal wastewaters in order to abate <br />the pollution problems in Las Vegas Bay on Lake Mead. <br /> <br />As a result of the expected population growth and economic <br />expansion, future discharges to municipal and industrial waste- <br />water treatment works are estimated to triple--as measured by <br />BOD--during the 1965-2020 period. ' <br /> <br />At present there is a consider~)le amount of reuse of water <br />in the Region. Treated sewage is used as industrial cooling and <br />as irrigation water. Irrigation return flows make up part of <br />downstre~a supplies that are eventually reapplied to crops. <br />Higher types of uses are projected, based on the results of pilot <br />projects currently underway in the Region and the Pacific <br />Southwest area. Further work will be necessar.l to assure the <br />chemical, biological, and virological safety of treated wastewaters <br />prior to implementation of those programs suggesting unrestricted <br />use of reclaimed effluents. <br /> <br />The program suggested for metropolitan Las Vegas includes <br />the construction and operation of a tertiary treatment plant to <br />abate the pollution problem of Las Vegas Bay. The plant would <br />vary in size from 50 mgd in 1980 to 120 mgd in 2000. It is <br />estimated that the tertiary plant would remove nearly all of the <br />suspended solids, color, odor, and bacteria, most, of the BOD, <br />detergent and phosphorus, and a large fraction of the nitrogen. <br />The wastewater treatment program outlined for Las Vegas <br />incorporates a desalting works for the renovation of secondary <br />effluents for reuse for municipal and industrial purposes. <br /> <br />~he suggested water quality management program for the <br />Gila Subregion is tied to major reuse facilities for Metropolitan <br />Phoenix and Tucson. In the program all wastes from the urbanized <br />Phoenix area would be treated to an equivalent secondary level <br />and the effluent applied to the land to effect additional removals <br />by ground water recharge. A pilot project that is presently <br />carrying out this idea is achieving encouraging reSUlts, and <br />with the BOD, coliform, ammonia, nitrogen and phosphorus removals <br />now achieved, the water should be acceptable for use on all types <br />of edible crops. <br /> <br />I <br /> <br />] <br /> <br />I <br /> <br />iv <br /> <br /> <br />1 <br /> <br />