• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.777-780
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• 2008

레미콘공장에서 발생되는 회수수는 대부분 재활용되고 있으나, 회수수 슬러지에는 시멘트, 골재, 혼화제 등이 포함되어 있어, 콘크리트 제조시 성능을 저하시키는 요인으로 작용하고 있다. 본 연구에서는 회수수에 포함되어 있는 슬러지를 콘크리트용 혼화재료로서 활용하고자 기존의 연구를 참고하여 슬러지를 하소하여 활성도를 부여하였다. 활성도를 부여한 슬러지를 콘크리트용 혼화재로 사용한 특성을 분석하기 위하여 기본배합을 고로슬래그 미분말 대체, 플라이애시 대체, 고로슬래그 미분말과 플라이애시를 혼합 대체한 3가지 수준으로 하였으며, 기본배합에 대하여 활성 슬러지를 결합재의 2.5%씩 12.5%까지 대체하였다. 그 결과, 슬러지 대체율이 증가할수록 슬럼프는 다소 감소하였으며, 공기량은 증가하였으나, 큰 변화는 보이지 않았다. 콘크리트의 압축강도는 슬러지의 대체율 증가에 따라 소폭으로 증가하는 경향이었다. 이러한 결과를 바탕으로 레미콘 공장에서 발생되는 회수수 슬러지에 활성도를 부여하면 콘크리트 품질에는 큰 변화가 없을 것으로 판단되며, 회수수의 슬러지 농도를 저감시켜 레미콘 품질향상에도 기여할 것으로 전망된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 봄 학술논문 발표대회
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• pp.136-137
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• 2020

This study compared and analyzed the fluidity and strength characteristics of mortar using the recycling water, indicates strong alkali properties, as pre-wetting water of artificial light aggregate to increase usage ratio of recycling.

• 펄프종이기술
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• 제31권4호
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• pp.1-7
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• 1999

This study was carried out to simulate the change of various properties of recycled water when zero-discharge system was applied to a KOCC recycling process. contaminants such as chemical oxygen demand, anionic trash, and calcium hardness were gradually increased in the process water as the recycling was repeated . Especially, the increase of anionic trash and COD were closely related to the starch derived from corrugating adhesive in KOCC. Four kinds of water were compared in the preparation of handsheet to evaluate the performance of retention program. Waters used in this work were laboratory tab water, process water from Dong-II mill and the same one treated by UASB process, and closed white water prepared by KRICT. The result revealed that one the major factors fro reducing a retention power was the anioni trash accumulated in the recycled water.

• 산업진흥연구
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• 제1권1호
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• pp.137-142
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• 2016

물 재이용에 대한 인식이 물 재이용 실천의도에 미치는 영향을 검증하였다. 연구결과 물 재이용 절수제품 구매의도에 유의한 영향을 미치는 요인은 물 재이용 실천 필요성 인식, 세면수 재활용 양변기 효과 인지도(p<.01), 공공기관 절수제품 의무설치 인식, 절수제품 의무설치 대상 확대 찬성도, 물 재이용 법률 인지도(p<.05)로 나타났다. 또한 월평균 가구소득이 150만원 이하인 경우, 직업이 전문가 및 관련 종사자와 판매 및 기능 종사자인 경우, 월평균 수도요금이 4만원대 이상인 경우 물 재이용 절수제품 구매의도가 상대적으로 높은 집단 간 차이가 나타났다. 본 연구는 물 재이용에 대한 인식이 물 재이용 실천의도에 미치는 영향을 분석함으로써 물 재이용 실천율을 높이기 위한 물 재이용 정책 추진방향에 시사점을 제공한 데 그 의의가 있다.

• 상하수도학회지
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• 제38권1호
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• pp.1-15
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• 2024

Occurrence of process environment changes, such as influent load variances and process condition changes, can reduce treatment efficiency, increasing effluent water quality. In order to prevent exceeding effluent standards, it is necessary to manage effluent water quality based on process operation data including influent and process condition before exceeding occur. Accordingly, the development of the effluent water quality prediction system and the application of technology to wastewater treatment processes are getting attention. Therefore, in this study, through the multi-channel measuring instruments in the bio-reactor and smart multi-item water quality sensors (location in bio-reactor influent/effluent) were installed in The Seonam water recycling center #2 treatment plant series 3, it was collected water quality data centering around COD, T-N. Using the collected data, the artificial intelligence-based effluent quality prediction model was developed, and relative errors were compared with effluent TMS measurement data. Through relative error comparison, the applicability of the artificial intelligence-based effluent water quality prediction model in wastewater treatment process was reviewed.

• 수산경영론집
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• 제47권3호
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• pp.35-52
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• 2016

This paper analyzed economic feasibility of aquacultural construction which of large-scale. The results of the economic analysis, cage cultural and water recycling cultural by post-water treatment were analyzed that NPV is 2,083,685 thousand won and -14,105,896 thousand won and B/C ratio is 0.590 and 0.855, respectively. These were shown economic infeasibility. But, running water culture by pre-water treatment(small scale) and running water culture by pre-water treatment(large scale) were analyzed that the one is 5,555,747 thousand won and 15,048,589 thousand won and the other is 1,154 and 1,1221, respectively. these were shown economic feasibility. In addition, measurement of B/C ratio through a sensitivity analysis on running water cultural by pre-water treatment(small scale) and running water cultural by pre-water treatment(large scale) is economic feasibility in all cases. However, these were analyzed when the selling price was falling to 20 percent, it has shown economic infeasibility and when the selling price rises to 20 percent, water recycling culture by post-water treatment has economic feasibility. The significance of the study analyzed a sensibility as well as economic feasibility by methods and scales. It is expected that used as basic materials when constructing and operating of land aquaculture in order to minimize the damage from natural disasters.

• The Plant Pathology Journal
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• 제19권6호
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• pp.280-283
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• 2003

A soybean-sprout rot epidemic occurred in a mass production soybean sprout factory in 2000 and 2001 in Korea, which caused up to 20% production loss. Among the causal pathogenic bacteria and fungi, Pythium deliense was found to be the dominant pathogen of severe root and hypocotyls rot, particularly in recirculating water system. An average of 90% of the isolated fungi from the rotted sprout on potato dextrose agar were Pythium sp. The fungal density of Pythium in the sampled water was monitored in the recycled water system for 1 year using a selective medium (com meal agar with Pimaricin, 10 mg； Rifampicin, 10 mg； and Ampicillin, 100 mg per 1 liter). The drained water from the soybean-sprout cultivation always had a certain amount of fungus in it. The removal of Pythium from the recycling water system must be thorough, safe, and environment friendly. However, the pathogen in the water was easily found even after ozone and chlorine treatments, which were devised on the recycling system for the removal of microorganisms. 5-$\mu\textrm{m}$ pore size filter was applied and was able to successfully control the disease. As the sprout industry increasingly shifts into mass production, the demand for water will increase continuously. Recycling water for sprout production is eco-friendly. However, a process must be devised to be able to first decompose organic matters before Pythium zoospores are filtered.

• 한국환경과학회지
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• 제5권1호
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• pp.83-91
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• 1996

A recycling soap was prepared from non-cooking oils. The effects of physlcal and chemical properties of the recycling soap on biodegradation are expected to be different due to the thermal histories of the non-cooking oils. Therefore, the biodegradation rate of the recycling soap was studied by using Klebssella Pneumoniae(K. pneumoniae), and the growth rate of K. pnewoniae in soap solution was observed. The biodegradation rate of the recycling soap appeared to be slower as the thermal histories of the non-cooking oils became larger. This might be resulted from hydrolysis, in which the ester bonds in the oils are broken to produce hydroxyl group. It was also observed that the growth rate of the microorganism decreased with the increase in the thermal histories of the oils. As a result, it is desired that recycling soap should be produced from the non-cooking oils with the prober ranges of thermal histories to reduce water contamination. The non-cooking oils with larger thermal histories are considered to be recycling through the cracking process before used. Key Words : non-cooking oils, recycling soap, thermal history, biodegradation, microorganism growth.

• Membrane and Water Treatment
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• 제6권2호
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• pp.103-112
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• 2015

In India, recycling of treated effluent plays a major role in the industry. Particularly in copper industry, recycling techniques for treated effluents adopt conventional technologies which are not energy efficient and recovery of high quality process water, free flowing salts and sludge's is very low. This paper presents an overview of enhanced modern technology for treated effluents in copper industry making it more efficient with high recovery of high quality process water and free flowing salts. Life cycle cost (LCC) would be 15-20% lower than the conventional technologies. The conventional technology can be replaced with this proposed technique in the existing and upcoming copper industries.

• 환경위생공학
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• 제23권4호
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• pp.13-21
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• 2008

With the rise in membrane applications, residuals management has become a growing challenge for membrane system. The primary residuals of MF/UF (microfiltration/ultrafiltration) system results from the wastes generated during backwashing. Many regulatory agencies, utilities, and water process engineers are unfamiliar with the characteristics and methods for treatment and disposal of membrane residuals. Therefore, this study was performed to investigate the backwash residuals water quality from the pressurized system with and without pre-coagulation, and to suggest approaches for the backwash residuals treatment. Pressurized MF system was installed at Guui water intake pumping station and operated with raw water taken from the Han River. We compared performances with and without the recycling backwash residuals at flux conditions, 50 LMH and 90 LMH with and without pre-treatment (coagulation). Based on the results, recycling of backwash residuals in pressurized system with pre-coagulation showed applicability of backwash residuals managements. Moreover, the recovery rate also increased up to over 99%.