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Effect of anions on the removal of bisphenol A in wastewater by electro-oxidation process
Jo, Eun-Young,Lee, Tae-Kwon,Kim, Younghee,Park, Chan-Gyu Balaban Publishers 2016 Desalination and Water Treatment Vol. No.
<P>Bisphenol A (BPA), an endocrine-disrupting chemical, exists widely in natural waters. Advanced oxidation processes, which are based on the generation of hydroxyl radicals (OH), are one of the promising techniques for the treatment of BPA. The goal of the present study was to investigate the effect of nitrate, bicarbonate, and carbonate in wastewater treatment plant (WWTP) effluent on the removal of bisphenol A (BPA) by bench-scale electro oxidation (EO) process using DSA-Ti electrode. The removal efficiency of BPA against scavenger effect of nitrate and alkalinity was characterized under a variety of reaction time and current densities. In the current density of 3mA/cm(2), the BPA removal efficiencies showed 40% within 20min in the presence of nitrate, whereas the BPA removal efficiency was close to 100% in the absence of nitrate. Under the same condition, 42 and 80% of BPA was removed in the presence of bicarbonate and carbonate, respectively. The results indicated that the EO process is a promising technology to remove BPA effectively in WWTPS. However, since the efficiencies of the EO process were remarkably reduced when the concentrations of anions in WWTPs increased, electrochemical technology such as EO process could be used only to oxidize the non-biodegradable compounds during the WWTP process.</P>
Policy Direction for Pyrolysis of Waste Plastic from the Perspective of Circular Economy
( Younghee Kim ),( Ji Hye Jo ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
Environmental and social problems caused by plastic waste continue to emerge, and recently there is a discussion that the plastic problem should be examined in terms of greenhouse gas reduction. Addressing the fundamental problem of plastic waste requires disconnecting the traditional linear economy and transitioning to the circular economy system. There is growing interest in the chemical recycling of waste plastics in major European Union countries, including the Netherlands. Korea also set the goal of increasing the pyrolysis treatment rate by selecting 'conversion to pyrolysis instead of landfill and incineration' as a national task. In this study, the current status of the pyrolysis market in Korea was analyzed and policy tasks were derived from the perspective of the circular economy system. Until now, most waste plastics have been mechanically and thermally recycled, but the market for chemical recycling such as pyrolysis is expanding. In this process, policy issues to be improved for the revitalization of the pyrolysis industry in the future were derived. In addition, this study presented policy tasks in terms of granting legal status to chemical recycling and pyrolysis oil, separation of waste plastics, location and safety standards for pyrolysis facilities, and analysis of the contribution of the circular economy system to the pyrolysis market. Finally, active communication among related industries is required when establishing policies. It is necessary to strengthen the value chain and operate the consultative body regularly.
김영희(Younghee Kim),조지혜(Ji Hye Jo) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.1
기계적 재활용이 어려웠던 혼합 폐플라스틱의 처리와 석유대체 물질 확보 측면에서 열분해를 비롯한 화학적 재활용 기술이 주목받고 있다. 특히, 열분해의 생산물인 열분해유는 연료뿐만 아니라 원료로 활용이 가능하므로 재생원료 관점에서 고부가가치 재활용이 가능하다는 장점을 가진다. 플라스틱 폐기물 발생 저감과 플라스틱으로 인한 온실가스 배출량 감축을 위해 재생원료 사용 의무 목표를 부여하는 국가가 증가하고 있으며, 글로벌 플라스틱 재생원료 시장 규모도 476.2 억 달러 (2022 년)에서 763.3 억 달러 (2028 년)로 확대될 것으로 전망된다. 그러나 폐플라스틱 열분해유를 포함한 화학적 재활용 제품에 대한 화학물질 안전관리와 관련된 정책, 가이드라인 및 연구 사례는 미흡한 상황이다. 재생원료 사용 시 플라스틱 내 1차 가소제와 2차 가소제의 축적 가능성, 가소제로 사용되는 프탈레이트 농도에 따른 유해화학물질 분류 등 화학물질 관리 측면에서 안전 관리가 필요한 실정이다. 본 연구에서는 폐플라스틱 열분해 과정에서 검출된 프탈레이트를 비롯한 가소제의 사례를 분석하여 재생원료 화학물질 안전관리 정책의 기초자료로 활용하고자 한다.