• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.685-690
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• 2001

Along with the expansion of industrial activities, the quantity of industrial waste sludge is increasing, and the treatment/disposal of wastes is a social problem regarding the preservation of the environment. In particular, recycling the sludge as a raw material is actively required considering the situation of Korea, which is poor in natural resources and energy. Lime is a necessity for treatment of waste sludge, which often can be made recyclable by lime treatment. In this thesis, a brief description has been given of my views on the ordinary treatment of waste sludge and the effective use of inorganic industrial waste sludge focusing on lime.

• 유기물자원화
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• 제28권3호
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• pp.45-49
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• 2020

본 연구는 하수슬러지와 건조연료를 혼합한 혼합물에 대해 토지개량효과를 검토하기 위한 연구이다. 혼합물은 하수슬러지와 건조연료를 중량대비 1:1 비율로 혼합하여 만들었다. 1개의 대조군(0 %)부지와 혼합물을 10 %, 20 %, 30 % 시비한 3개의 비교군을 조성하였다. 토양의 유효인산 함량변화는 혼합물을 시비한 비율에 따라 상관관계가 높은 것으로 확인되었다(P<0.05). 케나프를 90일 재배 후 수확량을 비교한 결과 10 %투입된 배지에서 줄기의 길이가 대조군 대비 73 %증가를 보였으며, 잎 수확량의 경우 20 %배지에서 227 % 가장 높은 증가율을 보였다. 30 %에서는 다른 배지보다 꽃의 개화가 먼저 된 것으로 보아 성장률이 다른 배지보다 빠른 것으로 판단되며 엽록소 함량은 71.6(SPAD)으로 가장 높은 수치를 보여 조단백질의 함량이 다른 배지에 비해 높을 것으로 판단된다. 따라서 건조연료 혼합물의 투입을 통해 전체적으로 식물이 생육하기 좋은 토질로 개선하는데 효과가 있는 것으로 사료된다.

• 환경위생공학
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• 제10권1호
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• pp.86-96
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• 1995

Alum recovery has recently gained more attention because many water utilities need to improve their sludge handling and disposal practices. As part of an overall sludge management program recovery can reduce the amount of solids and allow for reuse of the recovered Alum as a coagulant. This study was examined the effectiveness of Alum recovery from the Sludge at the D water treatment plant in Kwangju city. The results were summarized as follows 1. Alum recovery was obtained sufficiently acidification(An optimum condition was pH2-3) With $H_{2}SO_{4}$ to settled sludge. In this case recovered liquid Alum from sludge of 2.1% solids concentration at pH 2.1 was contains Aluminum $1,602mg/{\ell}$(as $Al_{2}O_{3}$ 0.3% ) and other metal of low level. 2. It was an optimum condition to all reuse of recovered Alum as a coagulant that rate of Commercial Alum:Recovered Alum=$14{\mu}{\ell}/{\ell}{\;}:{\;}200{\mu}{\ell}/{\ell}$ In a result of Jar Tests. 3. It was a result of Alum recovery from sludge, the reduction effect of amount of solids was about 57.4%. 4. If all recovered Alum were reused the reduction effect of solid wastes disposal cost and chemical drug's cost was about 22%.

• 환경위생공학
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• 제24권3호
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• pp.28-36
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• 2009

We have closely examined the concentration change characteristics, emission amounts, and the material balance of hazardous air pollutants at both early and later stages of the prevention facilities. These results will be uses as the basic data when preparing for the regulatory and management plans for hazardous air pollutants. The results of the study on heavy metals illustrated that the content of heavy metals in sludge across five facilities were as follows: copper> zinc> chrome> nickel> cadmium> mercury. In terms of heavy metal content in swage sludge, the sludge in incinerating facilities other than the sludge in the D incinerating facility containing industrial water waste, was examined in order to satisfy the ocean contamination standard and fertilizer specifications. Most of the items were shown to have satisfied the emission tolerance standards in the latter part of the prevention facilities(The average elimination rate was over 90%). Therefore, it is concluded that swage sludge containing high-concentrate heavy metals needs to be incinerated rather than recycled as fertilizer.

• 산업경영시스템학회지
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• 제30권1호
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• pp.105-114
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• 2007

In this paper, we propose sludge collection strategies which allocate each sewage store of village to sewage treatment plants and decide the schedule of sludge collection in order to collect sludge efficiently. The strategies aim to decrease transportation cost with deciding proposed vehicle routing and scheduling the sludge collection. When we decide route of vehicles, we consider the collection time in sewage store of village, distance between sewage store of villages and vehicle information as average velocity of vehicle, operation time of vehicle driver. We also develop the SCMS (Sludge Collection Management System) based on windows system with real data which is used in certain circumstance. And we experiment to figure out vehicle route and transportation cost throughout changing input data.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.327-328
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• 2021

In the manufacturing process of ready-mixed concrete, quantity management directly affects the workability and strength of concrete. Therefore, water quantity is the most important management factor for water quality control of ready-mixed concrete. It can be said that the number of unit water in the mix design, the water quantity due to the surface water contained in the aggregate used, and the water quantity taking into account the concentration of sludge contained in the recycling water when using the recycling water are factors that affect the quantity management of ready-mixed concrete. In this study, as a stable quality control method of ready-mixed concrete, a quantity management method by aggregate surface water and a sludge concentration management method according to the use of recycling water were proposed. Thus, we tried to suggest an efficient quantity management method for stabilizing the quality of ready-mixed concrete.

• 전기학회논문지
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• 제67권11호
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• pp.1477-1485
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• 2018

There are two major issues for activated sludge process in sewage treatment plant. One is how to make sewage be more clean and the other is the energy saving in sewage treatment process. The major monitoring sewage qualities are chemical oxygen demand, phosphorus, nitrogen, suspended solid in effluent. These are transmitted to the national TMS(Telemetry Monitoring System) at every hour. If these exceed the environmental standard, the environmental charges imposed. So, these water qualities are to be controlled below the environmental standard in operation of sewage treatment plant. And recently, the energy saving is also important in process operation. Over 50% energy is consumed in blowers and motors for injection oxygen into aeration tank. So, with the water qualities to be controlled below the environmental standard, the energy saving also is to be accomplished for efficient plant management. Almost researches are aimed to control water quality without considering energy saving. AI techniques have been used for control water quality. AI modeling simulator provided the optimal control inputs(blower speed, waste sludge, return sludge) for control water quality. Blower speed is the main control input for activated sludge process. To make sewage be more clean, the excessive blower speed is supplied, but water quality is not better than the previous. In results, non necessary energy is consumed. In this paper we propose a new method that the energy saving also is to be accomplished with the water qualities to be controlled below the environmental standard for efficient plant management. Water qualities in only aeration tank are used the inputs of fuzzy models. Outputs of these models are chemical oxygen demand, phosphorus, nitrogen, suspended solid in effluent and have the environmental standards. In test, we found this method could save 10% energy than the previous methods.

• 한국지반환경공학회 논문집
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• 제17권8호
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• pp.5-15
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• 2016

국내 하수처리장의 증가 및 방류수 수질기준 강화 등에 따라 하수 슬러지의 발생량은 지속적으로 증가하는 추세이다. 기존 하수 슬러지는 소각과 해양배출 등으로 처리하였지만, 대기오염과 해양배출 금지 등에 따라 최근에는 자원화 또는 에너지화 방법 등을 연구하고 있다. 그러나 전반적인 기술의 수준 및 적용기술에 대한 체계적인 분석 등이 부족하여 관련 기술에 대한 향후 분석이 필요한 실정이다. 본 논문은 슬러지 처리기술, 고체연료화 및 바이오가스 증산 활용기술을 대상으로 관련 특허, 논문 동향을 조사하였다. 또한, 국내 외 연구개발 추이를 분야별 5개 국가별(한국, 일본, 중국, 미국, 유럽)로 조사 및 분석하였다. 향후 슬러지의 효과적 처리를 위해 필요한 기술 분야를 제시하였다.

• 대한안전경영과학회지
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• 제22권2호
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• pp.7-13
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• 2020

Sludge incineration facilities are socially recognized as a hate facility. Therefore, a careful deodorization plan must be established. Therefore, the incineration facility must conduct research on odor ventilation. In this study, a odor diffusion simulation in an incineration facility was conducted and analyzed. In particular, research was carried out on carry-in rooms, pre-treatment rooms, and storage facilities for crops, which are expected to rapidly spread odor. As a result, ammonia 1.62, hydrogen sulfide 0.63, and acetaldehyde 0.73 were found in the transfer room. In addition, pretreatment rooms and stencil storage facilities were found to be lower than regulatory standards.

• 한국지반환경공학회 논문집
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• 제10권7호
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• pp.125-133
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• 2009

하수를 정화하는 과정에서 발생하는 슬러지는 과거 주로 매립되어 왔으나, 2003년 유기성 슬러지의 매립금지라는 폐기물 관리법이 개정됨에 따라 최근에는 주로 해양투기 되어왔다. 그러나 '런던협약 96의정서'에 의해 2011년부터 해양투기도 금지될 예정이어서, 세계 각국은 슬러지의 다양한 처리방법에 대해 노력하고 있다. 우리나라도 예외 없이, 하수슬러지의 합리적인 처리방법을 찾기 위해 현재 많은 전문가들이 노력하고 있으며, 그중 하나가 재생 에너지화이다. 슬러지의 재생 에너지화의 성패는 친환경적이고 경제적인 건조방법에 달려 있다 해도 과언이 아니다. 따라서 본 연구에서는 영동군에서 발생하고 있는 하수슬러지를 재생에너지화하기 위해, 슬러지의 화학적 특성을 분석하여 에너지화 가능성을 검토하고, 마이크로파를 물과 슬러지에 각각 조사하여 슬러지의 건조 특성과 효율성 등을 분석하였다. 그 결과, 영동군하수 슬러지는 중금속 성분이 매우 적고 열량이 3,370kcal/kg 이상으로 재생에너지화하기에 적당함을 확인하였다. 또한, 마이크로파에 의한 슬러지 건조 특성을 분석한 결과, 슬러지 중량 대비 시간의 곡선은 투입 슬러지 량에 관계없이 늘어진 S자 형태의 거동특성을 보임은 물론 그 기울기가 일정함을 확인하였다. 또한, S 곡선을 변곡점 기준으로 세 영역으로 나눌 경우 두 번째 영역에서 건조가 가장 많이 일정하게 발생하며, 전체 건조량의 약 80% 이상임도 확인하였다. 본 결과는 향후 마이크로파를 이용한 full-scale 건조공정에서 투입 슬러지 대비 슬러지 건조량을 예측하는데 적용할 수 있다. 또한 본 실험 결과에 의하면, 마이크로파에 의한 건조능력이 약1.0kg/kW 이상을 보이고 있어 경제성도 갖고 있음을 확인하였다.