• 제목/요약/키워드: Municipal wastewater

검색결과 297건 처리시간 0.024초

CNR공법의 체류시간에 따른 도시하수의 질소제거 (The Nitrogen Removal of Municipal Wastewater with HRT using CNR Process)

  • 김영규;양익배;김인배
    • 한국환경보건학회지
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    • 제26권3호
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    • pp.98-102
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    • 2000
  • The aim of this study was to evaluate on the removal effect of total nitrogen in municipal wastewater by decreasing hydraulic retention time(HRT) from 6 hour to 4 hour on CNR process. CNR-A(Cilia Nutrient Removal) is the process combining A2/O process with cilium media of H2L corporation. The removal efficiencies for T-N were 63.1% in A-1 reactor, and 73.5% in A-2 reactor and 77.0% in A-3 reactor. The specific nitrification(g-NH3-N/g-MLVSS.d) of Oxic in CNR-A process was 0.07-0.32. The specific denitrification in Anoxic and the specific nitrification inOxic was higher in HRT 4 hour because of optimum F/M ratio.

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In-Depth Characterization of Wastewater Bacterial Community in Response to Algal Growth Using Pyrosequencing

  • Lee, Jangho;Lee, Juyoun;Lee, Tae Kwon;Woo, Sung-Geun;Baek, Gyu Seok;Park, Joonhong
    • Journal of Microbiology and Biotechnology
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    • 제23권10호
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    • pp.1472-1477
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    • 2013
  • Microalgae have been regarded as a natural resource for sustainable materials and fuels, as well as for removal of nutrients and micropollutants from wastewater, and their interaction with bacteria in wastewater is a critical factor to consider because of the microbial diversity and complexity in a variety of wastewater conditions. Despite their importance, very little is known about the ecological interactions between algae and bacteria in a wastewater environment. In this study, we characterized the wastewater bacterial community in response to the growth of a Selenastrum gracile UTEX 325 population in a real municipal wastewater environment. The Roche 454 GS-FLX Titanium pyrosequencing technique was used for indepth analysis of amplicons of 16S rRNA genes from different conditions in each reactor, with and without the algal population. The algal growth reduced the bacterial diversity and affected the bacterial community structure in the wastewater. The following in-depth analysis of the deep-sequenced amplicons showed that the algal growth selectively stimulated Sphingobacteria class members, especially the Sediminibacterium genus population, in the municipal wastewater environment.

굴껍질을 이용한 하수슬러지의 탈수특성에 관한 기초연구 (The Characteristics of Municipal wastewater Sludge Dewatering Using Oyster Shell Powder)

  • 신남철;문종익;정유진;장혜정;성낙창
    • 한국환경보건학회지
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    • 제26권2호
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    • pp.30-33
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    • 2000
  • The objective of this study is to examine the subsitiution effect of the waste oyster shell powder as the conditioning agent in municipal wasterwater sludge dewatering process. Beacuse the oyster shells have a large amount(about 38% by weight) of alkaline minerals, such as calcium and magnesium, they are thought to have the potential as a good conditioning agent. In this study, the physico-chemical properties of powdered oyster shells (75${\mu}{\textrm}{m}$ or 200 mesh) and the dewatering characteristics of municipal waste water sludge using powdered oyster shells and CaCO3 are investigated. The conclusions are as follows, 1. Oyster shell could produce calcium ions up to 14ppm at pH-7.0, and this represents that oyster shell is a potential properties as a good conditioner. 2. 100ml of wastewater sludges, conditioned with pretreated oyster shell, are dewatered to the level of 25% solid concentration. 3. Wasterwater sludges, conditioned with oyster shell and CaCO3 are dewatered to the level of 32% solid concentration. And this shows that two-stage combined conditioning process is desirable than the one-stage conditioning process.

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초음파처리 슬러지 탄소원을 첨가한 침지헝 분리막공법의 질소, 인 처리에 관한 연구 (The Nitrogen and Phosphorus Removal of MUNR Process Using Sludge Carbon Source)

  • 김영규;황성희
    • 한국환경보건학회지
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    • 제28권5호
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    • pp.1-3
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    • 2002
  • This study was to evaluate on the removal efficiencies of total nitrogen and phosphorus in municipal wastewater at MUNR process using sludge carbon source for environmental micro-organism. The removal efficiencies of total suspended solid were 85.9~91%, total nitrogen were 38.6~87.2% and total phosphorus were 30.8~39.0%, respectively. It was shown that removal efficiency of nitrogen was effectively influenced by sludge carbon source treated with ultrasonication. The removal efficiency of total phosphorus was low because the sludge was not wasted during this treatment.

Development on the Process for Nitrogen and Phosphorus Removal in Municipal Wastewater Treatment System

  • Kim, Young-Gyu
    • 한국환경보건학회:학술대회논문집
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    • 한국환경보건학회 2003년도 Challenges and Achievements in Environmental Health
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    • pp.144-146
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    • 2003
  • The removal effect of total nitrogen in municipal wastewater by decreasing hydraulic retention time(HRT) from 6 hour to 4 hour on MNR process was not decreased.. The removal efficiencies of nutrient removal process combining A2/O process with media for T-N were 63.1% in the reactor operated 6 hour, and 73.5% in the reactor operated 5 hour and 77.0% in the reactor operated 4 hour.

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미세조류 옥외 배양시스템을 이용한 도시하수 정화 및 미생물 군집다양성 분석 (Municipal Wastewater Treatment and Microbial Diversity Analysis of Microalgal Mini Raceway Open Pond)

  • 강시온;김병혁;신상윤;오희목;김희식
    • 미생물학회지
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    • 제48권3호
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    • pp.192-199
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    • 2012
  • 미세조류는 광합성을 통하여 바이오디젤과 같은 부가가치상품을 생산할 수 있으며, 미세조류를 이용한 생명공학 기술이 주목 받고 있다. 그러나 질소원과 탄소원은 미세조류 배양 비용을 높여 충분한 바이오매스 생산에 제한요소가 되고 있다. 미세조류를 배양하는데 도시하수를 이용하는 것은 생산단가를 낮추는 좋은 대안이 될 수 있으며, 본 연구에서는 옥외 수질정화 배양 시스템(mini raceway open pond)을 이용하여 적용했다. 실험에 사용한 도시하수는 하수종말처리장의 1차 침전지를 거친 유입수를 이용하였으며, 토착 미세조류를 mini raceway open pond에서 배양하였다. 체류시간 6일의 운전 후 TN, TP, COD-$_{Mn}$, $NH_3$-N의 평균 제거 효율은 80.18%, 63.56%, 76.34%, 96.74%로 각각 나타났다. 18S rRNA gene 분석결과 녹조류인 Chlorella, Scenedesmus가 우점하였으며, 16S rRNA gene 분석결과 Rhodobacter, Luteimonas, Agrobacterium, Thauera, Porphyrobacte의 5종의 bacteria가 동정되었다. 이러한 결과를 통하여 미세조류를 이용한 호기성 처리나 과도한 발전비용 없이 효과적인 하수처리를 할 수 있는 가능성을 확인하였다. 그리고 도시하수는 미세조류 배양에 필요한 탄소원과 질소원을 제공할 수 있으며 미세조류 바이오매스는 상업적 목적으로 이용될 수 있는 가능성을 확인할 수 있었다.

생물막공정을 이용한 질산화 및 병원성 미생물의 제거 (Nitrification and Removal of Pathogenic Microorganisms Indicators by an upgraded RBC)

  • 방두연;장인수;김지학;와타나베 요시마사
    • 상하수도학회지
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    • 제12권1호
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    • pp.108-114
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    • 1998
  • Experiments on an upgraded RBC were conducted to investigate its removal efficiencies of $NH_4-N$, coliform group and coliphage in the municipal wastewater treatment. A bench scale RBC, made of stainless mesh media with 5mm high surface protrusions, was fed with settled municipal wastewater containing 13-25mg/l of $NH_4-N$ and 40-75mg/l of TOC at the hydraulic loading of $89l/m^2.d$ and $60l/m^2.d$. It was found that the nitrification effectively occured at bulk liquid TOC concentration of less 10mg/l. The coliform group and coliphage were more than 98% and 90%, respectively.

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Nutrient Removal and Biofuel Production in High Rate Algal Pond Using Real Municipal Wastewater

  • Kim, Byung-Hyuk;Kang, Zion;Ramanan, Rishiram;Choi, Jong-Eun;Cho, Dae-Hyun;Oh, Hee-Mock;Kim, Hee-Sik
    • Journal of Microbiology and Biotechnology
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    • 제24권8호
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    • pp.1123-1132
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    • 2014
  • This study evaluated the growth and nutrient removal ability of an indigenous algal consortium on real untreated municipal wastewater in a high rate algal pond (HRAP). The HRAP was operated semicontinuously under different hydraulic retention times (HRT: 2, 4, 6, and 8 days). The average removal efficiencies of chemical oxygen demand, and total nitrogen and phosphate of real municipal wastewater were maintained at $85.44{\pm}5.10%$, $92.74{\pm}5.82%$, and $82.85{\pm}8.63%$, respectively, in 2 day HRT. Algae dominated the consortium and showed high settling efficiency (99%), and biomass and lipid productivity of $0.50{\pm}0.03g/l/day$ and $0.103{\pm}0.0083g/l/day$ (2day HRT), respectively. Fatty acid methyl ester analysis revealed a predominance of palmitate (C16:0), palmitoleate (C16:1), linoleate (C18:2), and linolenate (C18:3). Microalgal diversity analyses determined the presence of Chlorella, Scenedesmus, and Stigeoclonium as the dominant microalgae. The algal consortium provides significant value not only in terms of energy savings and nutrient removal but also because of its bioenergy potential as indicated by the lipid content (20-23%) and FAME profiling.