Environmental Project's Achievements Reports Query System

Project of exemplification and guidance for domestic wastewater reclamation and reuse

Absrtact	In Taiwan, most pollution of rivers usually comes from municipal wastewater. The treated wastewater reclamation and reuse not only increase water resource but also reduce the loading of river pollution. According to recommendation from local governments, eight places were selected to draw up the water reuse system where there are potential for water reuse and six places have executed. Two of the selected places execute secondary wastewater treatment, three execute advanced level and two of the selected places execute grey water reuse. The additional processes were recommended to comfort the required water quality, including disinfection for microorganism removal, filtration for SS removal and active carbon adsorption for color and odour improvement. The reused water qualities of BOD, SS, COD and E. coli which was treated by the additional treatments conform the related criteria (BOD＜10mg/L, SS＜10mg/L, COD＜30mg/L and E. coli: ＜200CFU/100mL). The recommended applications of water reuse in these places include landscape irrigation, toilet flushing, landscape and others. The average wastewater reclaimed rate in the places was 76.1% and the reclaimed water usage rate was 49.2%.Average benefit-cost ratio is 2.6 and net present value is positive. It means the enough economic benefit to execute water reuse. The total benefit of reducing water pollutant loading will reach 558.7kgBOD/yr. The places which accepted EPA government subsidies last year were investigated in order to assess effects about water reuse. These items were included economic and environmental economic benefits, drawback assessment and improvement ways. The demonstrative conferences were held to promote water reuse in these places. The “recommended guidelines for domestic wastewater reclamation and reuse” was draw up and bulletined. The document summarizes water reuse guidelines, including the scope of reuse, recommended water qualities for toilet flushing and landscape irrigation, and technical issues in planning water reuse systems, and so on. The recommended water qualities considered BOD for environmental protection, E. coli, residual chlorine and turbidity for sanitation, pH for facilities maintenance, and appearance and odour for sense.
Keyword	Domestic,wastewater,,wastewater,reclamation,and,reuse,,risk,and,benefit,

Absrtact

In Taiwan, most pollution of rivers usually comes from municipal wastewater. The treated wastewater reclamation and reuse not only increase water resource but also reduce the loading of river pollution. According to recommendation from local governments, eight places were selected to draw up the water reuse system where there are potential for water reuse and six places have executed. Two of the selected places execute secondary wastewater treatment, three execute advanced level and two of the selected places execute grey water reuse. The additional processes were recommended to comfort the required water quality, including disinfection for microorganism removal, filtration for SS removal and active carbon adsorption for color and odour improvement. The reused water qualities of BOD, SS, COD and E. coli which was treated by the additional treatments conform the related criteria (BOD＜10mg/L, SS＜10mg/L, COD＜30mg/L and E. coli: ＜200CFU/100mL). The recommended applications of water reuse in these places include landscape irrigation, toilet flushing, landscape and others. The average wastewater reclaimed rate in the places was 76.1% and the reclaimed water usage rate was 49.2%.Average benefit-cost ratio is 2.6 and net present value is positive. It means the enough economic benefit to execute water reuse. The total benefit of reducing water pollutant loading will reach 558.7kgBOD/yr. The places which accepted EPA government subsidies last year were investigated in order to assess effects about water reuse. These items were included economic and environmental economic benefits, drawback assessment and improvement ways. The demonstrative conferences were held to promote water reuse in these places. The “recommended guidelines for domestic wastewater reclamation and reuse” was draw up and bulletined. The document summarizes water reuse guidelines, including the scope of reuse, recommended water qualities for toilet flushing and landscape irrigation, and technical issues in planning water reuse systems, and so on. The recommended water qualities considered BOD for environmental protection, E. coli, residual chlorine and turbidity for sanitation, pH for facilities maintenance, and appearance and odour for sense.

Keyword

Domestic,wastewater,,wastewater,reclamation,and,reuse,,risk,and,benefit,