Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Characteristics of Waste Sewage Sludge Treated by Ultrasound and Ozone

오존과 초음파에 의한 도시하수슬러지의 처리 특성

Yoon, Yong-Soo;Bae, Chul-Ho;Choi, Suk-Soon
윤용수;배철호;최석순

  • Published : 20021100
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Abstract

In this Study, ozone and ultrasound were adopted for the treatment of waste sludge from the municipal sewage treatment, plant, and the properties of the treated sludge and that of the raw sludge were compared. For the waste sludge with MLSS concentration of 7233 mg/L, the degradation rate constants of dissolved organic matters were $0.297\;min^{-1}\;and\;0.102\;min^{-1}$ for ultrasound treatment and ozone treatment, respectively. To evaluate the characteristics of the released organic matters and nutrient by sludge degradation in the ultrasound treatment, SCOD, SBOD, T-N and T-P were analyzed. It was found that 0.127 g of SCOD, 0.181 g of SBOD, 0.038 g of T-N and 0.039 g of T-P were released per g of MLSS, respectively. In the case of ozone treatment, the quality of released of SCOD, SBOD, T-N and T-P were 0.038 g, 0.058 g, 0.011 g and 0.012 g per g of MLSS, respectively. In addition, the SCOD/TCOD, relative index of sludge biodegradation was enhanced to 0.51 with ultrasound treatment and 0.21 with ozone treatment from initial value of 0.024 in waste sludge with MLSS concentration of 5733 mg/L.

본 연구에서는 오존과 초음파를 이용하여 도시하수 처리장에서 발생하는 슬러지를 처리하고, 처리 전 후의 슬러지 특성을 비교 검토함으로써 오존과 초음파의 이용 가능성에 대하여 확인하였다. 초기 MLSS농도가 7233 mg/L인 슬러지 중에 존재하는 용해성 유기물의 용출속도상수(k)는 초음파 처리 경우에 0.297\;min^{-1}$, 오존처리 경우에 $0.102\;min^{-1}$로 나타났다. 슬러지의 파괴에 의해 용출되는 유기물의 양을 확인하기 위하여 SCOD, SBOD를 분석하였으며, 영양염류인 총질소와 총인의 용출에 대하여 고찰하였다. 초음파처리에 의해 MLSS 1 g당 SCOD와 SBOD는 각각 0.127 g, 0.181 g이 용출되었으며, T-N과 T-P는 각각 0.038 g, 0.039 g이 용출되었다. 또한 오존처리시에는 SCOD와 SBOD는 각각 0.038 g, 0.058 g이 용출되었으며, T-N과 T-P는 각각 0.011 g, 0.012 g이 용출되었다. 그리고 슬러지의 생분해 가능성의 상대적인 척도가 되는 SBOD/TCOD비는 MLSS농도가 5733 mg/L인 슬러지의 경우 초기 0.024에서 초음파와 오존처리된 후에 각각 0.51과 0.21로 크게 증가되었다.

Keywords

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