A hybrid waste stabilization pond and wastewater storage and treatment reservoir system for wastewater reuse for both restricted and unrestricted crop irrigation

A hybrid waste stabilization pond-wastewater storage and treatment reservoir system is proposed to produce microbiologically safe effluents for both restricted and unrestricted crop irrigation. The wastewater is treated in an anaerobic and facultative pond (and in a maturation pond if the number of human intestinal nematode eggs in the raw wastewater so require). During the non-irrigation season the WSP effluent is used to fill a single WSTR, and during the irrigation season the WSP effluent is used for restricted irrigation and the WSTR contents for unrestricted irrigation. A typical design example shows that the WSTR is financially viable, with an internal rate of return of 58 percent.