Monthly Characteristics of Dewatered Sludge from Sewage Treatment Plant

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Research article

Journal of the Korean Society for Environmental Analysis 2018;21(2):95-102.

하수처리장 발생 탈수슬러지의 월별 성상 특성

홍순기¹, 변혜진¹, 유윤정¹, 이석기², 홍태기¹

¹한서대학교
²우석대학교

Abstract

This study was performed to analyze the monthly characteristics of sewage sludge by analyzing the basic data required for recycling in thermal power generation or as incineration plant auxiliary fuel. Analytical samples were collected from two sites every month for three years, for 72 samples total. Proximate analysis (such as moisture, ash, and volatiles), elemental analysis (C, H, O, N, and S), tube furnace-ion chromatography, and calorimetry (heating value) were performed to evaluate the sludge heating characteristics. Resultantly, the moisture values were 73.2-89.5% (average 82%), the volatile values (dry basis) 44.8-83.0% (average 66.5%), and the low heating values (10% moisture basis) 2,014-4,304 kcal/kg (average 3,248 kcal/kg). The low heating values (10% moisture basis) exceeded the recycling standard of 2,000 kcal/kg, confirming the possibility of recycling the sludge as fuel. When we looked at the monthly heating value of the sewage sludge, it tended to be high in November, December, January, and February. Thus it could be concluded that sewage-sludge-based fuels generated in winter could obtain higher quality with higher heating value when sewage sludge is recycled as fuel.

Key Words: Sewage sludge, Heating value, Moisture, Volatile, Ash