• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.4
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• pp.132-137
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• 2018

Although the number of chemical accidents has been declining since the Chemical Control Act of 2015, there have been repeated occurrences of similar types of accidents at printed circuit board (PCB) manufacturing facilities. These accidents were caused by the overflow of hydrochloric acid and hydrogen peroxide, which are toxic chemicals used in the printed circuit board manufacturing process. An analysis of the $Cl^-$ content to identify the cause of the accident showed that in the mixed route of hydrochloric acid and hydrogen peroxide, which are accidental substances, the $Cl^-$ concentration was 66.85 ppm in the hydrogen peroxide sample. Through reaction experiments, it was confirmed that the deformation of a PVC storage tank and generation of chlorine gas, which is a toxic gas, occurred due to reaction heat occurring up to $50.5^{\circ}C$. This paper proposes a facility safety management plan, including overcharge, overflow prevention, leak detection device, and separation tank design for mixing prevention in printed circuit board manufacturing facility etch process. To prevent the recurrence of accidents of the same type, the necessity of a periodic facility safety inspection and strengthening of the safety education of workers was discussed.

• Current Research on Agriculture and Life Sciences
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• v.24
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• pp.43-47
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• 2006

The soils of plastic film houses in which intensive cultivation takes place suffer from the serious problems such as severe salinity and accumulation of heavy metals etc. The objective of this research was to examine the change in soil properties with repeated cucumber cultivation under plastic film house at Gunwi-Gun area. The soils were classified mainly to Danbuk and SinJung series. Clay content is lower in the soils of plastic film house than in the field soil. Available $P_2O_5$ and exchangeable cations were accumulated at the level higher than the optimum range. The content of extractable heavy metals were higher in the soils of plastic film house than in those of the field. For optimum yield, much attention should be paied to the management of soils by the pre-soil survey.

• Journal of the Korean Institute of Gas
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• v.28 no.1
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• pp.35-43
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• 2024

With continuous advancements in industry, science, and technology, there is a steady increase in the number and utilization of new chemicals. The growing societal emphasis on chemical safety management is paralleled by an increasing public demand for robust safety measures. While various ministries at the government level oversee the safety management of chemical substances, the occurrence of accidents related to chemical substances remains frequent each year due to problems such as aging facilities and careless handling. Upon analyzing domestic chemical accident cases, incidents occurred predominantly in the sequence of leakage, explosion, fire, and others. The main causes of these accidents were examined, revealing facility defects and non-compliance with safety management as the primary contributing factors. In this study, Hazard and Operability Analysis (HAZOP) was employed to identify hazardous risk factors associated with the handling of hydrofluoric acid in workplaces, and a risk assessment was performed using Bow-Tie method. Based on the results of this study, it is expected to enhance safety management plans aimed at preventing chemical accidents in workplaces dealing with similar facilities. Ultimately, these insights contribute to the development of an advanced chemical safety management system, capable of proactively preventing potential chemical accidents.

• Environmental engineer
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• s.40
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• pp.50-53
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• 1989

본 회사는 제비표 페인트 제조회사인 건설화학과 대일본 잉크화학공업(주)와 합작회사로서 1971년에 설립되어 공업용 접착제인 페놀수지를 국내 최초로 생산하여 자동차, 도료, 전자산업 발전에 이바지하였고, 각종 도로 경기장을 우레탄 수지를 생산하므로서 88올림픽 경기를 통하여 국제적으로 품질의 우수성을 인정받은 바 있습니다. 현재 반월공장은 대지가 12,523평, 건평 4,694평, 종업원 280명으로서 안양에서 '88. 10.12 이전하여 본사와 공장기능

• The Magazine for Energy Service Companies
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• s.33
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• pp.30-33
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• 2005

㈜테크윈(대표이사 정붕익)은 1980년 LG화학 청주공장의 설비보수유지관리업무를 시작으로 이 분야에서 20여년의 기술노하우를 축적한 ESCO이다. 이후 LG화학에서 분사, 지난 99년 12월 테크윈으로 법인을 설립한 이 회사는 2000년 1월 ESCO등록을 했다. 대기방지시설 등 환경분야에서 구축한 독보적인 기술력을 바탕으로 ESCO사업에서도 소리소문없이 두각을 나타내고 있는 테크윈을 만나본다.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.4 no.2
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• pp.179-186
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• 2006

Chemical wastes are generated from nuclear facilities and R&D laboratories, but the uranium concentration in the final dried cake is evaluated into 11.2 Bq/g, which exceeds the exemption level of 10 Bq/g for each U isotopes, so the cake is categorized into a radioactive waste. Acid dissolution was applied to extract uranium from the waste sludge, and uranium adsorption on the dissolved solution was experimented by using IRN-77 and Diphosil bead. A large amount of resin was required to get above 80% of uranium removal, which was found to be due to a large amount of metal ions simultaneously dissolved from the precipitates with uranium. As an alternative method, acid dissolution is applied to the dewatered wet cake of the sludge, and the natural evaporation method is adopted for the dissolved solution. The uranium concentration of the dissolved solution was estimated to be 6.97E-01 Bq/ml, and the specific activity of the final waste sheets is evaluated to be 4.3 Bq/g. These results lead to the suggestion that the application of acid dissolution to the wet cake and the natural evaporation for the dissolved solution is an effective treatment method for chemical wastes containing uranium.

• Journal of agricultural medicine and community health
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• v.13 no.1
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• pp.82-87
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• 1988

사람의 흡충류감염(吸蟲類感染)은 대부분(大部分) 열대(熟帶) 및 동부아세아지역(東部亞細亞地域) 여러 국가(國家)에서 발생(發生)한다. 주혈흡충증(住血吸蟲症), 간흡충증(肝吸蟲症), 태국간흡충증(泰國肝吸蟲症), 간흡충증(肝吸蟲症), 요꼬가와흡충증(吸蟲症), 이형이형흡충증(異型異型吸蟲症) 및 폐대흡충증(肺大吸蟲症)등은 어떤 일부(一部) 아세아국가(亞細亞國家)에 있어서 공중보건상(公衆保健上) 중요(重要)한 문제(間題)가 되어 있다. 이와 같은 패류매개성기생충감염(貝類媒介性寄生蟲感染)은 풍토병(風土病)을 일으키고 있다. 사람들의 생활습관은 풍토병을 일으키게될 원인이 될 뿐만 아니라 때로는 그 질병(疾病)을 유행(流行) 전파(傳播)시키는 기본적 요소가 되기도 한다. 주혈흡충을 제외한 흡충류감염은 우리가 중간숙주(中間宿主)을 먹었을때 그곳에 있었던 피낭유충(被囊幼蟲)에 의하여 감염이 이루어 진다. 식물(植物)의 생식(生殖)(간질(肝蛭), 폐대흡충(肺大吸蟲)), 게 및 가재 생식(폐흡충), 민물고기 생식(간흡충, 요꼬가와흡충, 이형이형흡충), 또는 우렁이 생식(극구흡충(棘口吸蟲)), 기타(몇가지 우연적감염(偶然的感染))등은 사람의 흡충류감염의 주 원인이 되는 것이다. 한편 주혈흡충 감염은 요염수원(汚染水源)에 접촉한 피부을 뚫고 들어온 쎌카리아 유충(幼蟲)에 노출되기 때문에 일어난다. 흡충류감염에 대하여 예방과 방어에 관한 공중보건학적 조치는 많다. 이들의 조치중에는 화학요법에 의한 감염원을 감소시키는 것, 패류숙주의 박멸, 만족할만한 위생시설의 비치, 급수시설, 보건교육, 진단기술의 보급, 환경관리 및 개선 등이 포함된다. 그러나 감염자들에 대한 화학요법은 가장 빠르고 효과적인 억제방법인 것으로 나타나고 있다. 흡충류감염을 예방하는데 있어서 가장 중요한 변화는 프라지콴텔과 같은 신약의 개발이었다. 프라지콴텔은 모든 종류의 주혈흡충, 간흡충, 폐흡충 및 여러가지 장내기생 흡충류등 사람의 병원성흡충류에 대한 치료제로서 가장 좋은 특효약이다. 흡충류감염이 중요한 보건문제가 되어 있는 곳에서는 그 예방과 억제책에 있어서 장단기계획(長短期計劃)을 수립하는 것이 좋을 것 같다. 단기는 집단화학요법을 조기에 실시하여야 하고 자기는 "비특이성 기구"로써, 예를들면 위생시설 및 급수시설의 설치, 보건교육등으로 감염을 감소시켜 감염유지 수준이하로 보지(保持)시키는 것이다. 이와같은 억제조치를 착실히 수행하기 위하여 많은일이 있다. 예를 들면 집단참여, 역학적 조사, 약물의 공급, 환경관리, 보건교육, 지역사회관련, 일차보건 진료와의 협조 및 재정후원등에 대하여 검토하고 연구하여야 할 것이다.

• Journal of the Korean Institute of Gas
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• v.22 no.5
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• pp.46-52
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• 2018

Interest in fire prevention/fighting has been increased by large fire. It is important to install/manage the detector, alarm, firefighting facility, evacuation route and so on to minimize the damage from fire. Chemical plant is generally constructed by steel structure. So fireproofing is significantly required to chemical plant because steel structure should endure during fire. Currently, fireproofing should be applied up to 6m from ground by local regulation. But chemical plant can handle the large amount of flammable materials or only non-flammable materials. Required of fireproofing height by fire magnitude is studied in this thesis.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11a
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• pp.111-111
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• 2005

• Air Cleaning Technology
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• v.24 no.3
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• pp.31-46
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• 2011