하수관거시스템 개량 우선순위 결정 모형

이정호,박무종,김중훈 한국방재학회 2008 한국방재학회논문집 Vol.08 No.06

The main objective of sewer rehabilitation is to improve its function while eliminating inflow/infiltration (I/I). If we can identify the amount of I/I for an individual pipe, it is possible to estimate the I/Is of sub-areas clearly. However, in real, the amount of I/I for an individual pipe is almost impossible to be obtained due to the limitation of cost and time. In this study, I/I occurrence of each sewer pipe is estimated using AHP (Analytic Hierarch Process) and RPDM (Rehabilitation Priority Decision Model for sewer system) was developed using the estimated I/I of each pipe to perform the efficient sewer rehabilitation. Based on the determined amount of I/I for an individual pipe, the RPDM determines the optimal rehabilitation priority (ORP) using a genetic algorithm for sub-areas in term of minimizing the amount of I/I occurring while the rehabilitation process is performed. The benefit obtained by implementing the ORP for rehabilitation of sub-areas is estimated by the only waste water treatment cost (WWTC) of I/I which occurs during the sewer rehabilitation period. The results of the ORP were compared with those of a numerical weighting method (NWM) which is the decision method for the rehabilitation priority in the general sewer rehabilitation practices and the worst order which are other methods to determine the rehabilitation order of sub-areas in field. The ORP reduced the WWTC by 22% compared to the NWM and by 40% compared to the worst order. 하수관거시스템 개량의 주된 목적은 불명수(Inflow/Infiltration, I/I)를 제거함으로써 그 성능을 향상시키는데 있다. 이때 전체 하수관거시스템 내에서 개개 관거별 I/I 발생량을 정량화할 수 있다면, 전체 하수관거시스템 내에서 소유역별 해당 정보의 추출이 보다 명확해질 수 있다. 그러나 실제 현장에서는 예산 및 시간의 제약 때문에 개개 관거의 I/I 발생 정보의 획득은 거의 불가능하다. 본 연구에서는 하수 관거별 I/I 발생량을 AHP(Analytic Hierarch Process)를 이용하여 정량화하였으며, 산정된 관거별 I/I 발생량을 이용하여 효율적인 하수과거 개량 사업 시행을 위한 개량 우선순위 결정 모형(Rehabiliation Priority Decision Model for sewer system, RPDM)을 개발하였다. 개개 관거별 I/I 발생량 산정 결과에 기반하여 RPDM은 개량이 시행되는 기간 동안 발생하는 I/I 발생량을 최소화하는 소유역별 최적 개량 우선순위(Optimal Rehabilitation Priority, ORP)를 유전자 알고리즘을 이용하여 결정한다. 이때 최적 개량 우선순위에 따른 소유역별 개량 시행 시 발생하는 이익은 개량 기간 동안 하수처리장으로 들어가는 I/I의 하수처리비용(Waste Water Treatment Cost, WWTC)에 대한 절감을 의미한다. 본 연구에서는 개발된 RPDM에 의한 최적 개량 우선순위의 결과는 일반적인 하수관거개량사업의 우선순위 결정 방법인 점수가중평가법(Numerical Weighting Method, NWM)과 최악의 개량순서에 따른 결과들과 비교되었으며, 개량 기간 동안의 I/I 처리비용이 점수가중평가법에 비하여 22%, 최악의 개량순서에 비하여 40% 감소하는 것으로 나타났다.

국내 하수관거의 포설현황 및 개선방향에 대한 조사연구

박상진 우송대학교 1996 우송대학교 논문집 Vol.1 No.-

In recent years many sewage treatment plants are constructing to preserve water quality of drinknig water resources from water pollution due to various wastewater. Well-maintained sewer facilites are necessary to upgrade the efficiency of wastewater treatment. But existent sewer facilites are defective to convey the generated sewage because of unplaned extension. The object of this investigation study are to collect basic data for the rehabilitation of existing sewer and the improvement of sewerage system. Sewer inspection for 44 sample areas are carried out by any one of the following three thecnique - television inspection, photographic inspection, physical inspection. As a results, 69 percentages of surveyed sewer showed the vertical misalignments and 42 percentages open joints, 55 percentages protruding house-connected pipes, 5 percentages. Most of problems are not caused by natural phenomenon but by artificial poor construction. Corrosion rate of sewer which has been passed more than twenty years in combined inspected sewer wystem was 23 percentages. In separated sewer showed miss-conncction between sanitary sewer and stormwater sewer. Additionally observed problems in sewage transport systems are as follows: ·Poor intercept of sewage at junction of trunk sewer and interceptor ·Use of U type ditch as sanitary sewer ·Miss connection between catch basin and lateral sewer

하수관거 정비지역의 관거이송 유량 및 수질특성 변화

박준대 ( Jun Dae Park ),오승영 ( Seung Young Oh ),최윤호 ( Yun Ho Choi ),김용석 ( Yong Seok Kim ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.2

This study analyzed the characteristics of sewer flow and its water quality, and investigated changes in the characteristics in three areas where the sewer rehabilitation projects have been carried out. In S1 area, the patterns of the flow became regular and the range of the fluctuation decreased after the sewer rehabilitation. The flow and its BOD concentration increased. The infiltration/inflow and exfiltration showed clear distinction before and after the sewer rehabilitation in this area. In S2 area, the patterns and the range of the fluctuation of the flow made no differences before and after the sewer rehabilitation. The flow decreased slightly and its BOD concentration increased considerably after the sewer rehabilitation. Big decrement in stormwater inflow but small in exfiltration appeared in this area. In S3 area, the patterns and the range of the fluctuation of the flow made no differences before and after the sewer rehabilitation. The flow decreased slightly and its BOD concentration increased in a small rate in this area.

천공장치를 이용한 배수설비 연결관 시공 기술에 관한 연구

장재구,강선홍,김동은,정태호 대한상하수도학회 2011 상하수도학회지 Vol.25 No.6

Ministry of Environment has been promoting BTL business of the sewer rehabilitation which continues from 2005 up to now. Sewer rehabilitation is classified into three parts : wastewater pipe rehabilitation, rainwater pipe rehabilitation and drainage equipment rehabilitation. Drainage equipment rehabilitation is that drainage pipe connects wastewater pipe directly without water-purifier. In the drainage equipment construction, it is inevitable to have the damage of ground structures(wall, gate and U drain, etc) when an open excavation method is used. Therefore it is necessary to develop non-excavation method to connect drainage pipe and wastewater pipe like jacking method to avoid the damage of ground structure. This paper has conducted an analysis of the non-excavation method using a boring machine attached to backhoe, which is issued the verification certificate of environmental technology according to the Development of and Support for Environmental Technology Act, article.7. The index set in this analysis was sectionalized to the condition of construction, the grade of drainage pipe, the size of excavated hole, the amount of waste cement concrete and asphalt concrete and the benefit effect compared to open excavation method. Ministry of Environment has been promoting BTL business of the sewer rehabilitation which continues from 2005 up to now. Sewer rehabilitation is classified into three parts : wastewater pipe rehabilitation, rainwater pipe rehabilitation and drainage equipment rehabilitation. Drainage equipment rehabilitation is that drainage pipe connects wastewater pipe directly without water-purifier. In the drainage equipment construction, it is inevitable to have the damage of ground structures(wall, gate and U drain, etc) when an open excavation method is used. Therefore it is necessary to develop non-excavation method to connect drainage pipe and wastewater pipe like jacking method to avoid the damage of ground structure. This paper has conducted an analysis of the non-excavation method using a boring machine attached to backhoe, which is issued the verification certificate of environmental technology according to the Development of and Support for Environmental Technology Act, article.7. The index set in this analysis was sectionalized to the condition of construction, the grade of drainage pipe, the size of excavated hole, the amount of waste cement concrete and asphalt concrete and the benefit effect compared to open excavation method.

하수관로 보수용 에폭시 라이너의 경화제에 관한 연구

김광수 ( Kwang Soo Kim ) 한국수처리학회 2010 한국수처리학회지 Vol.18 No.6

The problems in technologies of sewer rehabilitation, which have cured with epoxy resin, were to keep under refrigeration to protct a epoxy resin from hardening at room temperature. For studying no-hardening epoxy resin at room temperature, Experimental studies were carried out at different mixing ratios of TH-432, room temperature catalyst, and TH-100, high temperature catalyst. In the experimental results, the higher mixing ratio of high temperature catalyst, the longer the pot life time kept into gelation and gel phases without hardening to plastic matter at room temperature. The optimal mixing ratios of TH-432 and TH-100 were 40 to 60 or 60:40 by weight %. At that ones the gelation phase, being in the state of liquid, kept during 6 days and the gel phase, being in jellylike mass, did during 20hrs. In the view of the results, the epoxy resin mixed with high and room temperature catalysts was considered to keep the liquid or jelly conditions for a long time at room temperature without keeping it in cold storage. After pot life time under the condition of jelly or liquid, more than 80℃ of reaction temperature and 4hrs of reaction time was needed for perfect hardening of epoxy liner in sewer rehabilitation.

하수관거의 부분보수를 위한 VAP 공법의 평가

박규홍,김영식,유애권,이웅 中央大學校 建設環境硏究所 2000 環境科學硏究 Vol.11 No.1

Leaking from underground sanitary sewer systems can cause exfiltration of raw wastewater and industrial discharge through leaking pipes, contaminating soil and groundwater. Infiltration of groundwater through leaky joints and cracks in the pipe system can lead to excess cost at the treatment plant or contribute to pipe collapse Repair methods generally cost less than conventional replacement and involve less open trench excavation, resulting in reduced traffic disruption and public inconvenience. The purpose of this paper is evaluation of VAP technology for sewer rehabilitation.

fmGA를 이용한 하수관거정비 최적화 모델

류재나,기범준,박규홍,이차돈 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2

A long-term sewer rehabilitation project consuming an enormous budget needs to be conducted systematically using an optimization skill. The optimal budgeting and ordering of priority for sewer rehabilitation projects are very important with respect to the effectiveness of investment. In this study, the sewer rehabilitation optimization model using fast-messy genetic algorithm is developed to suggest a schedule for optimal sewer rehabilitation in a subcatchment area by modifying the existing GOOSER model having been developed using simple genetic algorithm. The sewer rehabilitation optimization model using fast-messy genetic algorithm can improve the speed converging to the optimal solution relative to GOOSE , suggesting that it is more advantageous to the sewer rehabilitation in a larger-scale subcatchment area than GOOSER .

하수관거 평가 및 정비 우선순위 의사결정도구 개발

한상종,황환국 대한상하수도학회 2015 상하수도학회지 Vol.29 No.1

A CCTV inspection method has been widely used to assess sewer condition and performance, but Korea lacks a proper decision support system for prioritizing sewer repair and rehabilitation (R&R). The objective of this paper is to introduce the results that we have developed in the Sewer Condition Assessment and Rehabilitation Decision-making (SCARD) Program using MS-EXCEL. The SCARD-Program is based on a standardized defect score for sewer structural and hydraulic assessment. Priorities are ranked based on risk scores, which are calculated by multiplying the sewer severity scores by the environmental impacts. This program is composed of three parts, which are decision-making for sewer condition and performance assessment, decision-making for sewer R&R priority assessment, and decision-making for optimal budget allocation. The SCARD-Program is useful for decision-makers, as it enables them to assess the sewer condition and to prioritize sewer R&R within the limited annual budget. In the future, this program logic will applied to the GIS-based sewer asset management system in local governments.

공업용수 배수관망시스템을 개선하기 위한 설계 대안의 수리해석

임성린 대한상하수도학회 2015 상하수도학회지 Vol.29 No.1

A CCTV inspection method has been widely used to assess sewer condition and performance, but Korea lacks a proper decision support system for prioritizing sewer repair and rehabilitation (R&R). The objective of this paper is to introduce the results that we have developed in the Sewer Condition Assessment and Rehabilitation Decision-making (SCARD) Program using MS-EXCEL. The SCARD-Program is based on a standardized defect score for sewer structural and hydraulic assessment. Priorities are ranked based on risk scores, which are calculated by multiplying the sewer severity scores by the environmental impacts. This program is composed of three parts, which are decision-making for sewer condition and performance assessment, decision-making for sewer R&R priority assessment, and decision-making for optimal budget allocation. The SCARD-Program is useful for decision-makers, as it enables them to assess the sewer condition and to prioritize sewer R&R within the limited annual budget. In the future, this program logic will applied to the GIS-based sewer asset management system in local governments.

The durability and rehabilitation technologies of concrete sewerage pipes: A state-of-the-art review

Zhuge Yan,Fan Wei,Duan Weiwei,Liu Yue 아시아콘크리트학회 2021 Journal of Asian Concrete Federation Vol.7 No.2

This paper reviews the literature available on the subject of the durability of concrete sewer pipes and the corresponding rehabilitation technologies. An introduction related to the importance of the sewer system in urban life and its durability issues was first discussed as most people did not recognise the scale and complexity of the underground sewer system. Then the recent development of alternative binder materials or filler materials to improve the acid resistance of concrete was specified. For instance, the effects of alternative binders on the hydration products and the mechanism of biogenic corrosion were discussed in detail. The paper ends with the current rehabilitation technologies and the structural performance of rehabilitated sewer pipes. Also, some suggestions associated with future research were made.