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91	Land Treatment for Primary Sewage Effluent: Water and Energy Conservation Rice, R. C., Gilbert, R. G. 15 April 1978 (has links) From the Proceedings of the 1978 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 14-15, 1978, Flagstaff, Arizona / Land treatment of secondary municipal wastewater is an economical and aesthetic method of upgrading water quality, if hydrologic and geologic conditions are favorable. Costly conventional secondary treatment, which requires large quantities of electrical energy, can be bypassed by applying the primary effluent directly to the land. Soil- denitrifying bacteria use the organic carbon in the primary effluent as an energy source for biodenitrification and nitrogen removal. Laboratory and field studies indicated the quality of renovated wastewater meets standards for unrestricted irrigation and recreational uses. Considerable savings, both in capital and energy costs, can be realized by land treatment of primary effluent. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Waste treatment Waste water treatment Water pollution treatment Water conservation Activated sludge Sewage effluents Cost-benefit analysis Feasibility studies Energy budget Water quality Alternative planning Effluents Conservation