하수슬러지의 응집조건 최적화를 통한 필터프레스 탈수성 개선

최효영(Hyoyoung Choi),김중현(Junghyeon Kim),이수진(Sujin Lee),변임규(Imgyu Byun) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.1

본 연구는 하수처리장에서 발생하는 슬러지의 함수율 저감을 위해 가압탈수 방식의 필터프레스 탈수를 적용하고 응집조건에 따른 탈수성 개선을 평가하였다. 필터프레스 탈수시 슬러지의 탈수성 향상을 위한 전처리로 응집제의 종류, 주입량, pH 등을 다르게 하여 다양한 응집조건을 적용하였다. 응집조건에 따른 탈수성의 향상은 제타전위의 변화와 여과속도(Time to filter, TTF) 및 필터프레스 탈수 후 여과케이크의 함수율을 측정하여 분석하였다. 응집 전처리에 따른 탈수성 평가 결과 무기응집제의 적용이 필터프레스 탈수에 적합하였다. 혼합슬러지의 경우 고형물 함량 대비 70 mg/gTS의 PAC. pH 10, 소화슬러지의 경우 고형물 함량 대비 100 mg/gTS의 PAC, pH 6이 최적 응집조건으로 나타났다. 최적 응집 조건을 적용하여 필터프레스 탈수 결과 여과케이크의 함수율은 각각 57%와 65%로 기존 원심탈수 슬러지 대비 함수율을 19~27% 정도 저감할 수 있었다. This study applied a filter press for dewatering that uses pressure to reduce the water content of sludge generated in sewage treatment plants and evaluated the improvement of dewaterability under various coagulation conditions according to the type of coagulants, amounts, and pH conditions. The improvement of dewaterability was evaluated by measurement of time to filter (TTF), change in zeta potential, and sludge cake generated after filter press dewatering. It was found that under the applied coagulation conditions, inorganic coagulants were suitable for filter press dewatering. The optimum conditions were PAC with a dose of 70 mg/gTS, pH 10 for mixed sludge, and PAC with a dose of 100 mg/gTS, pH 6 for anaerobically digested sludge. Under optimal coagulation conditions, the water content of the sludge cake was 57% and 65%, respectively, marking a reduction by 19-27% compared to conventional centrifuge dewatering.

정수장 슬러지의 저류 시간이 탈수 특성에 미치는 영향

최광회 ( Choi Kwang-hoe ),이광호 ( Lee Kwang-ho ) 한국환경기술학회 2000 한국환경기술학회지 Vol.1 No.2

본 연구 논문에서는, A 정수장의 조정조와 2차 저류조 슬러지의 저류 시간에 따른 탈수 특성을 조사하였다. 정수장 슬러지 시료의 탈수특성을 평가하기 위하여 TTF실험과 제타 포텐셜의 변화를 측정하였다. 이 연구를 위하여 양이온 폴리머 (K-051C)를 사용하여 슬러지의 탈수 특성을 평가하였다. 정수장의 조정조와 2차 저류조 슬러지의 제타 포텐셜은 시료 채취 후 마이너스값과 영의 값 사이에서 변화하였다. K-051C를 사용하여 개량된 조정조 슬러지의 탈수성은 저류 시간이 증가됨에 따라서 나빠졌고, 2차 저류조 슬러지도 같은 경향을 보였다. 2일 저류 후 2차 저류조 슬러지의 탈수성은 K-051C 50mg/ ℓ 주입량에서 가장 좋은 탈수 특성을 나타내었다. 그리고, 조정조 슬러지도 2일 저류 후 K-051C 5mg/ ℓ 주입량에서 가장 양호한 탈수 특성을 나타내었다. In this paper, the variances of zeta potential and sludges dewaterability based on storage time of the equalization basin and well II sludges were surveyed. In order to determine the dewatering characteristics of the water treatment plant sludge samples, time to filter (TTF) and zeta potential were measured. For these studies cationic polymer (K-051C) was chosen for water sludge dewatering experiments. The aeta potential of the equalization basin and well II sludges were varied between minus values and zero values after sampling. The dewaterability of equalization basin sludges using K-051C was deteriorated according to increase the storage time, also the well II sludges were the same. After two days storage the dewaterability of well II sludges on the dosage of K-051C, 50 mg/ ℓ, was the most good. And after two days storage the dewaterability of equalization basin sludges on the dosage of K-051C, 5mg/ ℓ, was the most excellent.

초음파와 전기장 처리에 의한 하수슬러지 탈수성 향상

모우종(Woo Jong Mo),한지선(Ji Sun Han),안창민(Chang Min Ahn),윤순욱(Soon Uk Yoon),석희정(Hee Jung Seok),김창균(Chang Gyun Kim) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.1

슬러지 처분비용은 하수처리장 운영에 있어서 중요한 경제적 요소이다. 더욱이, 2013년부터 유기성 폐기물의 해양투기가 금지되면서 대부분의 슬러지가 육상 처리 되어야 하기 때문에 슬러지의 발생량을 줄이는 것이 시급한 상황이다. 본 연구에서는, 초음파와 전기장 처리에 의한 하수슬러지의 탈수성 향상을 확인하고자 하였다. 슬러지는 pilot-scale의 전처리 장치로 초음파와 전기장 단독처리 그리고 초음파 및 전기장 병합처리 되었으며, 처리 후 lab-scale 필터프레스 장치로 탈수되었다. 실험한 초음파 에너지 밀도 범위는 225~1,200 kJ/L였고 전기장 처리장치는 4.5~24 kJ/L였다. 초음파 단독처리와 초음파 및 전기장 병합처리 된 슬러지의 탈수 cake 함수율은 에너지 밀도 1,200 kJ/L일 때, 처리하지 않은 슬러지보다 각각 10~12% 감소하였으며 이 때 슬러지 함수율은 65~66%였다. 초음파 및 전기장 병합처리가 초음파 단독처리보다 탈수된 슬러지 cake의 함수율을 낮추는데 효과적이었으나, 전기장 단독처리의 경우 에너지 밀도가 낮아 함수율의 변화는 거의 없었다. The sludge disposal is a major economic factor in the sewage treatment facility operation. Moreover, since the ocean dumping will be prohibited by Korean environmental law from 2013, sludge should be eliminated or sludge volumetric reduction should be performed urgently. In this study, improvement of the sewage sludge dewaterability was investigated by ultrasound and electric field treatment. Sludge was treated by a single or in combination of either the electric field or ultrasound on a pilot pretreatment facility, then it was dewatered by lab-scale filter press. The operating input energy of ultrasound device was varied from 225~1,200 kJ/L and electric field device was varied from 4.5~24 kJ/L. The water contents of dewatered sludge cake treated with ultrasound (1,200 kJ/L) and combination of ultrasound/electric field (1,224 kJ/L) were decreased 10~12% by comparing non treated sludge. At that time, water contents were 65~66%. The combination treatment of ultrasound/electric field was effective to reduce water content of dewatered sludge cake, however, water content was not changed by a single treatment of electric field because of low energy density.

논문 : 전해부상을 이용한 활성슬러지의 탈수성 향상

최영균 ( Young Gyun Choi ),박병주 ( Byung Ju Park ),박민정 ( Min Jung Park ),김윤중 ( Yun Jung Kim ),정태학 ( Tai Hak Chung ) 대한상하수도학회 2006 상하수도학회지 Vol.20 No.5

축산 슬러지와 혼합된 도시하수슬러지의 탈수성

조지민(Jo, Ji-Min),최민석(Choi, Min-Seok),한영규(Han, Young-Gyu),김영관(Kim, Yeong-Kwan) 강원대학교 산업기술연구소 2016 産業技術硏究 Vol.36 No.1

In this study, a series of experiment was carried to improve dewaterability of the sludge produced in a treatment plant, located in Hongcheon, Gangwondo, which has been treating municipal wastewater and livestock wastewater. Optimum sludge mixing ratio and the amount of sludge conditioner were determined. As sludge conditioners, alum and ferric salt were selected and tested. For the measurement of sludge dewaterability, capillary suction time(CST) and the specific resistance were measured, The specific resistance was detemined by running a series of Buchner Funnel Test. Mixing the two sludges at a 50:50 ratio with the addition of 20 mL alum gave the best results in terms of dewaterability. The moisture content decreased by 2% at this condition.

응집슬러지를 이용한 하수슬러지의 탈수성 및 침강성 개선

소수현,이병하,박준홍,차호영,김한수,송경근 대한상하수도학회 2018 상하수도학회지 Vol.32 No.2

This study aimed to investigate the feasibility of improving dewaterability and settleability of sewage sludge using coagulation sludge. When mixed with sewage sludge and coagulation sludge at 1:1 ratio, Capillary Suction Time(CST) and Specific Resistance to Filtration(SRF) decreased by about 56% and 68%, respectively. It is found that Total Solids(TS) and Volatile Solids(VS) of mixing sludge are increased by about 59% and 53%, respectively. Also, the turbidity of the mixing sludge supernatant was reduced from 99 to 16 NTU. It is observed that the mixing of sewage sludge and coagulation sludge at 1:1 showed better effect than using Poly-aluminum Chloride(PAC) coagulant at 25 mg/L.

오존처리에 의한 하수슬러지의 감량화

권재현,류성호,박기영,안규홍,염익태,이용훈 대한상하수도학회 2002 상하수도학회지 Vol.16 No.2

The effects of ozone treatment on the dewaterability of activated sludge wasted from a sewage treatment plant were investigated in this study. Following ozone treatment, sludge was dewatered using a pressure fitter. The sludge filterability evaluated by SRF deteriorated with ozone dosage at relatively low ozone doses due to sludge solubilization and particle size decrease. However, at ozone doses higher than 0.6gO_3/gSS, the SRF of the ozone treated sludge became comparable with the value for the sludge without ozone treatment. It is suggested that the oxidation of the viscous, high molecule organics attached at cell surface reduces the surface charge of sludge particle and promotes flocculation at relatively high ozone doses. Ozone treatment also cause the release of bound water trapped inside cells or flocs, resulting in significant reduction of cake water content after dewatering. In terms of cake volume, more than 70% reduction was obtained at 0.6gO_3/gSS. These observations suggest that ozone treatment has potential to significantly enhance sludge dewaterability and to produce a more compact cake without severe deterioration of its filterability.

산처리에 의한 정수슬러지 감량화

이병문,권재현,안규홍,이석헌,권대영 대한상하수도학회 2003 상하수도학회지 Vol.17 No.1

The acidic treatment of waterworks sludge released organic materials as well as inorganics such as Al, Fe and Mn. Through solubilization as mentioned above, the content of suspended solids reduced by 18% at final pH 3.5. It also increased thickening efficiency and dewaterability of sludge. However overdosing of H_2SO_4 made dewaterability deteriorated. It showed that the optimal condition of acidic treatment be as follows; 5.5㎖ dose of H_2SO_4(97%)/1 sludge, final pH 3.5 and 15minutes of reaction time. Under these conditions, reduction efficiencies of sludge through thickening and dewatering were 57% and 92.2% respectively and then 7.8% of raw sludge released as cake compared to 10.5% without acidic pre-treatment. Therefore, mass of dewatered cake decreased by 26% through acidic treatment. Water content of dewatered cake was reduced from 71% to 62% due to this treatment. The changes of sludge properties including particle size, zeta-potential and bound water by acidic treatment appear to be important keys in assesment of the improvement of sludge dewaterability.

체류시간에 따른 정수장슬러지의 탈수특성

문용택 ( Yong Taik Moon ),김병군 ( Byung Goon Kim ),김연권 ( Youn Kwon Kim ),김홍석 ( Hong Suck Kim ) 대한상하수도학회 2007 상하수도학회지 Vol.21 No.6

석회석을 이용한 소화슬러지 탈수성 개선 및 최적조건 결정

김은호,김형석 대한건설환경학회 2003 건설환경연구 Vol.2 No.4