• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 총회 및 춘계학술발표회
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• pp.226-229
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• 2001

For volume reduction of the wastewater generated on washing the soil contaminated with cobalt, recycling and reuse experiments of the wastewater were executed. Also. the soil remediation efficiency by repetitive washing with fresh citric acid was analyzed. The soil around TRIGA was sampled for the experiment. Results of recycling experiment by replacement-precipitation method were as follows. The remediation efficiency of 1st recycling wastewater was 97% and that of 2nd recycling wastewater was 94%. Also, To obtain remediation efficiency over than 90%, the 5th repetitive washing with fresh citric acid was needed.

• 한국지하수토양환경학회지:지하수토양환경
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• 제13권1호
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• pp.32-42
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• 2008

오염 토양 세척 공정에서의 계면활성제 비용을 줄이기 위해 활성탄을 이용한 선택적 흡착을 통해 계면활성제의 회수와 재이용 공정을 제안하였다. 본 연구에서는 토양 세척 공정, 계면활성제 회수 공정, 계면활성제 재이용에 의한 토양 재세척 공정으로 구성된 전체 공정에 대한 전산모사를 수행하여 운전변수에 대한 영향을 분석하였다. 계면활성제 첨가량은 미셀 생성 농도의 6-10배 정도가 최적이었으며, 활성탄 첨가량이 너무 많을 경우 계면활성제 재이용 효율이 감소하는 결과를 얻었다. 토양 흡착 효율 인자는 세척 공정에 크게 영향을 미치지 않는 반면, 활성탄 흡착 효율 인자는 회수 공정에 큰 영향을 미칠 수 있었다. 계면활성제 회수 및 재이용 공정을 적용할 경우 기존 세척 공정에 비해 계면활성제 요구량을 20-30% 수준으로 줄일 수 있을 것으로 보이며 발생하는 폐수에서의 오염도도 크게 줄일 수 있을 것으로 기대된다. 본 연구에서 개발된 모델을 통해 실제 복잡한 실험 이전 단계에서 전체 공정의 성능을 예측할 수 있으며 다양한 운전조건을 모사하여 최적의 운전조건을 도출하기 위한 기본적인 자료로 활용될 수 있을 것으로 판단된다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.169-170
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• 2005

• 한국농공학회논문집
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• 제55권3호
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• pp.91-104
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• 2013

The objectives of this study were to monitor and assess the environmental impacts of indirect wastewater reuse on water quality and soil in paddy fields. Yongin monitoring site (YI) irrigated from agricultural reservoir and Osan monitoring site (OS) irrigated with treated wastewater diluted with stream water were selected as control and treatment, respectively. Monitoring results for irrigation water quality showed a significant statistical difference in salinity, exchangeable cation and nutrients. Pond water quality showed a similar tendency with irrigation water except for the decreased difference in nutrients due to the fertilization impact. Soil chemical properties mainly influenced by fertilization activity such as T-N, T-P, and $P_2O_5$ were changed similarly in soil profiles of both monitoring sites, while the properties, EC, Ca, Mg, and Na, mainly effected by irrigation water quality showed a considerable change with time and soil depth in treatment plots. Heavy metal contents in paddy soil of both control and treatment did not exceed the soil contamination warning standards. This study could contribute to suggest the irrigation water quality standards and proper agricultural practices including fertilization for indirect wastewater reuse, although long-term monitoring is needed to get more scientific results.

• 자원환경지질
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• 제53권4호
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• pp.441-477
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• 2020

매년 다량 발생되고 있는 정화토가 적절하게 재이용 또는 재활용되지 못하고 반출 처리장에 적치되어 또 다른 환경적 이슈가 되고 있다. 이에 본 논문에서는 이러한 정화토의 재이용 및 재활용을 활성화하기 위하여 필요한 정화토의 토양 질 회복 기술에 대한 연구 및 개발 동향을 조사하였다. 이를 위해 먼저 정화기술별 토양 특성의 변화 양상을 살펴보고, 정화공정에 따른 토양 질의 열화 특성을 파악하였다. 뿐만 아니라 정화토 재이용 및 재활용을 위한 정책적 관련 사항들을 정리하고, 향후 필요한 연구들에 대하여 제안하였다. 본 논문은 국내외 관련 문헌들을 검색하여 작성하였다. 키워드 검색을 통하여 정화기술별 토양 특성의 변화와 토양 개량 및 회복 기술과 연관된 문헌을 조사하였으며, 본문에서는 주로 최근에 발표된 문헌들을 바탕으로 논의하였다. 뿐만 아니라, 제 1, 2차 토양보전기본계획을 참고하여 정화토 재이용 및 재활용과 관련된 정책적 사항들을 정리하였다. 현재까지 국내에서 가장 많이 적용된 토양경작, 토양세척, 열탈착 등을 대상으로 정화공정에 따른 토양의 특성 변화를 정리한 결과, 적용하는 정화기술에 따라서 매우 상이하게 나타나는 것으로 조사되었다. 특히 정화공정을 거치면서 토양 질이 열화되는 양상이 정화기술에 따라서 다르게 나타났다. 토양 개량 및 회복 기술은 크게 무기 개량제, 유기 개량제, 생물학적 개량제 등의 제제를 이용한 방법들로 구분할 수 있으며, 각 개량제에는 다양한 물질들이 활용되고 있고, 각 물질에 따라 개선 또는 향상되는 토양의 특성이 달랐다. 하지만, 각 정화기술별 열화되는 토양 질 회복을 위한 연구들은 현재까지 활발하게 수행되지 않은 것으로 조사되었다. 제 2차 토양보전기본계획에서는 정화토의 품질인증제, 목표관리제 등과 같은 정책적 방안이 명시되어 있음으로써 향후 정화토의 재이용 및 재활용이 촉진될 수 있을 것으로 예상된다. 정화토의 재이용 및 재활용을 위해서는 적용된 정화기술과 미래 용도를 고려한 공공활용성을 담보한 회복 기술들이 개발되어야 할 것으로 판단된다. 이와 더불어 제 2차 토양보전기본계획에서 제시한 정화토의 적극적 활용을 위해서는 이를 뒷받침할 수 있는 구체적이고 세부적인 정책 추진 방안이 마련되어야 할 것이다.

• 한국농공학회논문집
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• 제46권1호
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• pp.75-86
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• 2004

The objective of the research is to develop agricultural resue technologies of reclaiming the effluents from a municipal wastewater treatment plant and reusing for irrigated rice paddies. The Suwon wastewater treatment plant was selected for wastewater reuse tests. The control was the plots with groundwater irrigation (TR＃1), the treatment (TR＃2) using polluted stream water as it was, and three others using wastewater after treatment. Three levels of wastewater treatments were employed： the effluent from the wastewater treatment plant (TR＃3), sand filtering after treatment plant(TR＃4), and ultra-violet treatment after sand filtering (TR＃5). The randomized block method was applied to wastewater application to paddy rice with five treatments and six replica. The effects of various wastewater treatment levels on water quality, paddy soil, crop growth, yields, and the health hazards were investigated. The primary results indicate that cultivating rice with reclaimed wastewater irrigation did not cause a problem to adverse effects on crop growth and yields. Overall, wastewater could be used as a practical alternative measure for reclaimed wastewater irrigation. However, long-term monitoring is recommended on the effects on soil chemical characteristics and its related health concerns.

• 한국지하수토양환경학회지:지하수토양환경
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• 제17권4호
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• pp.36-43
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• 2012

Various methods are used to remediate soil contaminated with heavy metals or petroleum. In recent years, harsh physical and chemical remediation methods are being used to increase remediation efficiency, however, such processes could affect soil properties and degrade the ecological functions of the soil. Effects of soil washing, thermal desorption, and land farming, which are the most frequently used remediation methods, on the physicochemical properties of remediated soil were investigated in this study. For soils smaller than 2 mm, the soil texture were changed from sandy clay loam to sandy loam because of the decrease in the clay content after soil washing, and from loamy sand to sandy loam because of the decrease in the sand content and increase in silt content during thermal desorption, however, the soil texture remained unchanged after land farming process. The water-holding capacity, organic matter content, and total nitrogen concentration of the tested soil decreased after soil washing. A change in soil color and an increase in the available phosphate concentration were observed after thermal desorption. Exchangeable cations, total nitrogen, and available phosphate concentration were found to decrease after land farming; these components were probably used by microorganisms during as well as after the land farming process because microbial processes remain active even after land farming. A study of these changes can provide information useful for the reuse of remediated soil. However, it is insufficient to assess only soil physicochemical properties from the viewpoint of the reuse of remediated soil. Potential risks and ecological functions of remediated soil should also be considered to realize sustainable soil use.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.643-648
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• 2005

The objective of this paper is to analyze the environmental effects by the fertilizer change with wastewater reuse for agriculture. For this research, Lysimeter tests are being implemented to cultivate rice with different levels of fertilizer applications with wastewater irrigation., and to analyze the nutrient loading by wastwater reuse in paddy fields was examined the CREAMS-PADDY model. CREAMS-PADDY model is modified from CREAMS model for considering the hydrologic cycles in paddy field. As a result, in the lysimeter treated by irrigation with wastewater and chemical fertilizer with half of the conventional amount showed generally similar tendency to the control plot. This may require the modifications of standard cultural practices for rice in terms of fertilizer and pesticide applications. However, high concentration of sodium in wastewater might cause damage to physico-chemical properties of paddy soil. And the wastewater reuse effects on nutrient loads were quantitatively analyzed and this results provide the reasonable management for agricultural reuse.

• 한국지하수토양환경학회지:지하수토양환경
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• 제28권5호
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• pp.36-50
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• 2023

Soil health can deteriorate through both contamination and remediation. Accordingly, revitalization processes are needed to reuse or recycle the remediated soil. The study was conducted to assess the changes in soil health parameters of heavy metals-contaminated soil during soil washing process. In addition, unit processes were proposed to improve the quality of the remediated soil relevant to its reclamation purposes, such as agricultural and forest lands. A total of 21 indicators were used to determine whether the soil health was degraded or recovered. The performance of 6 amendments in improving soil health was quantitatively evaluated according to their dosage and application duration. Finally, the experimental results were assessed by simple regression analyses to determine the statistical significance and relative performance of each amendment. The results indicated that 18 health indicators out of 21 deteriorated through the soil washing process. Based on the results, it is recommended that several effective amendments be complementarily combined and applied in real applications because use of single amendment does not likely improve the quality of remediated soils.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.213-214
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• 2005