Economic feasibility of ozonation process for wastewater sludge treatment
- Economic feasibility of ozonation process for wastewater sludge treatment
- 안규홍; 박기영; 이재우; 맹승규; 황종혁; 송경근; 정민우; 이용훈
- cost assessment; ozonation; sludge treatment; 경제성분석; 오존처리; 슬러지처리
- Issue Date
- VOL 15, NO 6, 551-558
- An ozone treament system was introduced for an alternative method for municipal sluge treatment and disposal. An economic fersibillty was examined on the basis of the cost equations. If the ozonation of waste activated sludge is targeted to reduce sludge mass or volume, a high degree of ozone dosage might be necessary. A higher ozone dose, however, results in significant increase of the tooal cost. On the contrary, a low ozone dose may reslut in the insufficiency in sludge reduction and dewatering improvement in spite of low dapital and energy cost. Thus, there might exist an optimal ozone dose for economical sludge treatment and disposal. The sludge treatment system using ozonation for reduction and recycling is compare with incineration, ond of promising alternatives for landfill in Korea. The cost of ozonationg increases almost linearly with the plant capacity. The operational and maintenance (O&M) cost increases sharply together wiht increase in pure oxygen requirement. Although the O&M cost of ozonation system increases with the ozone dose required, the optimal total cost appeared to exist at the ozone dose of 0.2g O3/g DS considering other relevant costs. Though a simple cosst assessment, the ozonation process proposed here appears to be cost-effective for small and medium scale wastewater treatment plants. Furthermore, the ozonated sludge can haver many recycle options since it almost guarantees 100% inactivation of pathogens.
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