Energy-Wastewater Treatment and Solids Disposal

by William F. Garber, (F.ASCE), Chf. Engr.; Sewage Treatment Div., Bureau of Sanitation, City of Los Angeles, Hyperion Treatment Plant, Playa Del Rey, Calif.,
Sagar K. Raksit, (A.M.ASCE), Head of Solids Removal Research; Sewage Treatment Div., Bureau of Sanitation, City of Los Angeles, Hyperion Treatment Plant, Playa Del Rey, Calif.,
George T. Ohara, (M.ASCE), Supervisor of Engrg. Section; Sewage Treatment Div., Bureau of Sanitation, City of Los Angeles, Hyperion Treatment Plant, Playa Del Rey, Calif.,


Serial Information: Journal of the Environmental Engineering Division, 1975, Vol. 101, Issue 3, Pg. 319-332


Document Type: Journal Paper

Abstract: Recently there has been an increase in the use and promotion of so-called advanced wastewater treatment and solids handling methods to meet discharge standards. The total energy consumption, by any wastewater treatment or disposal process, is proposed as an index for measuring the impact on the total environment. Two specific comparisons, based on the experiences of the City of Los Angeles, are presented: (1) Biological versus Chemicophysical process for wastewater treatment: and (2) ocean versus land disposal for wastewater solids. The chemicophysical processes required five times more energy then the biological process; and land disposal of solids required 16 - 35 times more energy than ocean disposal. This indicates that in some cases so-called advanced wastewater treatment processes as well as land disposal of wastewater sludges may not necessarily result in the least overall environmental impact (degradation).

Subject Headings: Solid mechanics | Wastewater treatment | Biological processes | Industrial wastes | Soil treatment | Ocean engineering | Water discharge | Energy consumption | North America | California | Los Angeles | United States

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