슬러지의 물리적 특성을 이용한 매립복토재 생산과 악취저감에 대한 연구 = A Study on the Production of Landfill-Cover Material Using the Physical Characteristics of Sludge and the Reduction of Odor

다국어 초록 (Multilingual Abstract)

The aims of this study is to improve physical properties of the sewage sludge and the process sludge generated in the leachate treatment by mixing the dry fuel, to develop the neutral solidifing agents that reduce oder, and to recycle the sewage and the process sludges as landfill cover materials. The mixing ratio (W/W) of sludges and dry fuel was appropriate at about 1:1, and the mixed materials were shown to be homogeneous at that ratio. We could know that when the sludges were mixed with dry fuel, moisture contents and viscosities are reduced, and air passages are formed between particles and particles. The various mixing tests and odor tests showed that the neutral solidifing agent was effective for the odor reduction. The main ingredient of the solidifing agent is the ash of sewage sludge, enabling it competitive in waste recycling and production costs. The landfill cover, using developed neutral solidification agent, improved physical properties to satisfy the quality standards and to increase the compressive strength. It also proved to reduce the value of complex oder and the usage of solidification agent to 1/3 (3,000 to 1,000) and to 1/8 (50% to 6%), respectively, from the comparative study with alkaline solidified landfill cover. Further research is under way to prove that this can be mixed with general soil to be used as a soil improvement agent for plant cultivation.

국문 초록 (Abstract)

본 연구는 하수슬러지와 침출수 공정슬러지를 건조연료와 혼합하여 물리적 특성을 개선하고 악취를 저감하는중성고화제를 개발하여 매립 복토재로 재활용하기 위한 연구이다. 슬러지와 건조연료의 배합비율(W/W)은 1:1이적정하며 기계 혼합시험에서도 균질하게 혼합되었다. 슬러지는 건조연료와 혼합되면서 함수율과 점성은 저감되고, 입자와 입자사이에 공극이 생겨 통기성을 가지게 된 것을 알 수 있었다. 다양한 혼합시험과 악취시험 결과, 중성고화제는 악취저감에 효과적인 것을 알 수 있었으며, 주 원료는 하수슬러지 소각재로 폐기물의 재활용과 생산비용에있어 경쟁력이 있다. 중성고화제를 적용하여 고화복토재를 생산하면 압축강도 등 물리적인 특성이 향상되고 복토재사용 품질기준도 만족하다. 또한, 알칼리성 고화복토제 대비 복합악취는 1/3 (3,000 → 1,000), 고화제 사용량은1/8 (50% → 6%)로 낮춘다는 것이 입증되었다. 그리고 이것은 토사와 혼합하여 식물재배를 위한 토지개량제로활용이 가능함을 입증하기 위해 추가 연구가 진행되고 있다.

참고문헌 (Reference)

• 1 "Waste Management Law, Enforcement Rules Annex 5.3 Soil Environment Conservation law, Enforcement Rules Annex 3"
• 2 Kim, M. G., "Solidification of Sewage Sludge with Waterworks Sludge and Application as Landfill Cover" 8 (8): 67-67, 2007
• 3 Ministry of Environment, "Regulations on the Recycling of Organic sludge, etc. for Soil Improvement and Recycling of Recycling for Landfill Cover" Ministry of Environment 2020
• 4 "National Sewerage Information System Statistics"
• 5 SUDOKWON Landfill Site Management Corp, "Feasibility Study and Basic Planning Report for Dehydration Sludge Reduction Project produced by leachate treatment planting Report for Dehydration Sludge Reduction Project in Leakage Treatment Plant" 2019
• 6 Lee, G. Y., "Evaluation of Paper Mill Sludge as an Alternative Landfill Cover Soil" Chungnam National University 2013
• 7 Anyang University Industrial-Academic Cooperation Group., "Development of osolidification technology using neutral solidifying chemical agent to reduce the odor from sewage sludge" Ministry of Environment 2006
• 8 SUDOKWON Landfill Site Management Corp, "Analysis on the Supply and Demand of Sewage Sludge Dried Fuel in Korea" 2019
• 9 Kim, J. S., "A Study on the Use of Solidification Sludge as the Intermediate Landfill cover" Inha University 2012
• 10 SUDOKWON Landfill Site Management Corp., "A Basic and Implementation Design Report on the Installation of Existing Solidification Treatment Facilities (Stage 3) in Sewage Sludge in the SUDOKWON Landfill Site" 2017
• 11 SUDOKWON Landfill Site Management Corp., "A Basic Study on the Survey of the Areas and Stinking Facilities around the SUDOKWON Landfill Site" 2019