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Optimization of Bench-scale Shipboard STP Operating Conditions for Artificial Wastewater Treatment
사나 만수르,정병길,정진희,권민지,최영익 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.5
This study intended to optimize the favorable operating conditions for Bench-scale shipboard STP by using artificial wastewater. For this purpose, the previously developed advanced sequence batch reactor and membrane bioreactor (MBR) combined system by our group was adopted at Bench-scale to study the applicability of this system for wastewater treatment and for the removal of nutrient and organic matter. The COD:T–N:T–P ratios of the influent were adjusted at 10:3:1 and the aeration during MBR process was provided at 7 min aeration and 3 min stop. The operating conditions were optimized by measuring the removal efficiencies of CODcr, T–P, and T–N at different time intervals of mixing and aeration. The operating conditions included mixing and aeration for 90:30, 80:40, 70:50, and 60:60 min, respectively. The optimal removal efficiencies were achieved under mixing and aeration for 70 min and 50 min, respectively, using Bench-scale shipboard STP. The results of the present study were in accordance with the MEPC.227(64) regulations for the removal of CODcr, phosphorus, and nitrogen for advanced shipboard wastewater treatment. A further study is required to evaluate a detailed mechanism of shipboard STP to justify the MEPC.227(64) regulations.
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SBR 및 MBR 복합공정을 적용한 Bench-scale Shipboard STP에서의 미생물 우점종에 관한 연구
최영익,신대열,사나 만수르(Sana Mansoor),권민지,정진희,정병길 한국환경기술학회 2018 한국환경기술학회지 Vol.19 No.6
International Maritime Organization (IMO) is one of the most effective organizations in evolving international law for the protection and conservation of the marine environment. The IMO, MARPOL(Marine Pollution) 73/78 contains six Annexes that provide an overarching framework for the objectives of the international marine pollution. Annex IV was regulated by 64 th resolution in 2012 to control sea pollution from sewage. In 2014 large-scale wastewater treatment and nutrient removal device was developed with a grant from the Ministry of Oceans and Fisheries. A combined new process of Sequence Batch Reactor (SBR) and Membrane Bioreactor(MBR) was developed to overcome the pollution caused by shipboard sewage. In the present study, shipboard sewage wastewater was treated by mixing and aeration cycle in the newly developed SBR process. Furthermore, during analysis by NGS technique(Macrogen Co., Ltd.), dominant species of bacteria were found in the aeration tank of the Bench-scale wastewater treatment facility. Bacteroidetes and Gammaproteobacteria accounted for 27.1 % of the aerobicbacteria and 16.8 % of the anaerobicbacteria, respectively. Microorganisms play a vital role in shipboard wastewater treatment. A further detailed study is required to understand the precise role of the microorganisms in the wastewater treatment. 국제 해사기구 (IMO)에서 MARPOL 73/78은 조문과 여섯 개의 부속서로 구성되어 있다. Annex Ⅳ는 선박의 하수를 규제한다. 2012년 제 64회 결의안에서 선박에서 배출되는 하수 중 영양염류를 제거하도록 규제하였다. 2014년 해양수산부의 지원으로 영양염류를 제거 할 수 있는 대용량 폐수처리 장치를 개발하였다. Sequence Batch Reactor (SBR)와 Membrane Bio Reactor (MBR)를 결합한 새로운 공정이 개발되었다. 현존하는 SBR 공정의 사이클에서는 침전을 제외하고 통기 및 교반만을 사용하였고, 상기 막은 처리 된 물을 배출 시키는데 사용하였다. 본 연구에서는 MACROGEN 사의 NGS 분석 기술을 이용하여 Bench 규모 폐수처리 설비를 이용한 하수처리장 원수를 처리하기 위한 최적 운전조건에서 폭기조 내 미생물의 우점종을 분석하였다. 그 결과 Bacteroidetes는 호기성 박테리아의 27.1 %를 차지했으며 Gammaproteobacteria는 혐기성 박테리아의 16.8 %를 차지하였다. Operational taxonomic unit ratio에 Others 항목이 차지하는 비율도 상당하다고 볼 수 있는데 기존의 오수처리를 위해 필요했던 미생물 외에 아직 NCBI (National center for Biotechnology Information)에 등록되지 않은 미생물일 가능성이 있어 추후 연구가 필요하다고 판단된다.
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Bench-scale 선박용 STP 장치에서 C : N : P 비율에 따른 인의 처리효율 비교에 대한 연구
최영익,지현조,신대열,사나 만수르,이승철,정진희 한국수처리학회 2018 한국수처리학회지 Vol.26 No.6
Water pollution is drastically increasing day by day, because of the enhancement in use of livestock, urban sewage detergents and fertilizers. Moreover increase in concentration of phosphorous and nitrogen contained in sewage, leads to green tide problem in the rivers and causes marine pollution. For this problem to solve, several technologies are being researched and developed. Among them, this experiment is a study on Bench-scale STP based on internationally certified sewage treatment equipment by MEPC. 227(64) of IMO. The purpose of this study is to compare the biological treatment efficiency of phosphorus of Bench-scale STP. The ratio of C:N:P was set to 10:5:3 and 10:3:1 as the operating conditions. And the operation cycle was set to anoxic(mixed) 70min - aeration 50min(70-50), anoxic(mixed) 90min - aeration 60min(90-60). As a result, the phosphorous treatment efficiency was 88% at average, and the treatment efficiency was steady at 90-60 better than 70-50. The efficiency of the bench-scale STP has been verified through this experiment and additional experiments are required to derive the optimal operating conditions.
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