• 제목/요약/키워드: Two-step Aeration System

검색결과 4건 처리시간 0.022초

기존 하수처리장에서의 처리 효율개선에 관한 연구 (A Study on the improvement of treatment efficiency in a conventional sewage treatment plant)

  • 안철우;박진식;문추연
    • 환경위생공학
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    • 제15권3호
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    • pp.50-56
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    • 2000
  • In this study, sewage were treated with operating Two-step Aeration System and conventional activated sludge process together in a condition. At the same HRT 8hr of Two-step Aeration System and Activated Sludge Process, BOD treatment efficiency of 1st sedimentation basin effluent 36.9% by Two-step Aeration system was 12.3% higher than 24.65 by Activated Sludge Process and the COD treatment efficiency 39.8% by two-step Aeration System was 11.6.3% higher than 28.2% by Activated Sludge Process. BOD and COD treatment efficiencies of 2nd sedimentation basin effluent were 88.1% and 85.6% Two-step Aeration System and were 83.8% and 82.3% Activated Sludge Process. In the first treatment, as BOD was relatively removed a lot, F/M ratio 0.17, $0.21{\cdot}BOD/kg{\cdot}MLSS.d$ was maintained by Activated Sludge Process. Therefore it was proved that organic matter treatment efficiency by Two-step Aeration System os Higher than by Activated Sludge Process in a aeration time 8hr. $NH_4^{+}-N$ treatment efficiencies were 55.5% by Two-step Aeration System and 39.75 by Activated sludge Process. $NO_3^{-}-N$ concentration in 2nd. sedimentation basin effluent were 3.33% by Two-step Aeration System and 2.36% by Activated Sludge Process. From this result, Two-step Aeration System was proved more advantageous treatment process for nitrification than Activated Sludge Process. The fluctuation range of BOD, COD and SS concentration in 2nd sedimentation basin effluent $16~33mg/{\ell}$, $15~23mg/{\ell}$ and $14~22mg/{\ell}$ by Two-step Aeration System was smaller than $16~57mg/{\ell}$, $15~25mg/{\ell}$ by Activated sludge Process. Overall the fluctuation range in 2nd sediment basin effluent by was smaller than by Activated Sludge Process. As a result, it is possible for this Two-step Aeration with no facility investment and a little of operation condition change in a conventional sewage treatment plant to get stability and nitrification of treatment water quality.

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과실 채소중 잔류농약(유기인제)에 관한 연구 (Organophosphorus Insecticide Residues in Fruits and Vegetables)

  • 윤숙자
    • 환경위생공학
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    • 제5권1호
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    • pp.83-92
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    • 1990
  • Adapting two step aeration system to a waste water treatment of W-paper manufactory as Full-Scale Plants, we drew a following conclusion from its practical working. 1. Because BOD removal efficiency was 20% in A-Stage, 90% in B-Stage and total removal efficiency was 97%. It worked treatment plant well and was suitable for effluent water standard as well. Because COD removal efficiency was 42% in A-stage, 71% in B-stage and the total removal efficiency was 94% COD control was possible in effluent water quality. 2. Treatment efficiency according to a load capacity was average 20% in 1.401 BOD kg/m3/d load of A-Stage and average 90% in 0.273 BOD kg/$\textrm {m}^3$ / d load of B-Stage. 3. Treatment efficiency according to a ratio of F/M was 2.657--5.024 kg BOD/kg MLSS/d in A-Stage and BOD removal efficiency was 16-261 in the same stage. The ratio of F/M was 0.068-0.094 kg BOD /kg MLSS/d and BOD removal efficiency ratio was 85-94%. Therefore treatment efficiency could be kept stably and volume of aeration tank could be reduced wholly. 4. Treatment efficiency according to MLSS appeared BOD 20%. COD 42%, in A-Stage and removal efficiency appeared BOD 90%, COD 71% in B-Stage. They were suitable for plan condition. 5. Because of working of complemented treatment plant by AB-Process. 20,000,000 Won a month was saved than the ordinary working cost. Therefore, it was assumed that invested cost could be recollected in 19 months or so consequently.

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식품폐수처리 RABC system의 생물막과 포기조 대사지문 비교 (Comparison of Metabolic Fingerprintings between Biofilm and Aeration Tanks of RABC System for Food Wastewater Treatment)

  • 이동근;유기환;성기문;박성주;이재화;하배진;하종명;이상현
    • 생명과학회지
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    • 제19권3호
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    • pp.349-355
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    • 2009
  • 돈 도축 식품폐수를 처리하는 생물막 시스템인 RABC (rotating activated Bacillus contactor) 공정의 생물막과 점감식으로 운영되는 포기조의 동일한 시료를 대상으로 Biolog GN2 plate를 이용한 호기/혐기 대사지문 분석으로 다음과 같은 결과를 얻었다. 첫째 대응표본 상관관계 분석과 pairs t-test를 통하여 매일 측정값보다 일별변화량이 전반적인 군집구조의 유사성을 나타내는 것으로 판단되었다. 둘째 생물막이 포기조 시료들에 비해 높은 탄소원 이용도를 보여(p<0.01) 생물막의 높은 유기물 제거 능력을 알 수 있었고 포기조 시료사이는 이용된 탄소원의 상관관계가 높았고(78%) 활성정도도 비슷하였다(p=0.287). 셋째 활발하게 이용된 탄소원의 종류는 시료별로 차이를 보여 활성을 보이는 군집이 각 처리단계 별로 변화하는 것으로 판단되었다. 마지막으로 같은 시료라도 호기/혐기 조건에 따라 대사지문에 차이를 보여 미호기성 및 혐기성 군집구성원에 의한 활성 차이를 확인하였다. 향후 대사지문(metabolic fingerprinting)을 통한 활성군집 비교에 일별변화량과 혐기조건 분석을 병행하면 더욱 풍부한 분석이 가능할 것이다.

Adventitious Root Cultures of Panax ginseng C.V. Meyer and Ginsenoside Production through Large-Scale Bioreactor System

  • Hahn, Eun-Joo;Kim, Yun-Soo;Yu, Kee-Won;Jeong, Cheol-Seung;Paek, Kee-Yoeup
    • Journal of Plant Biotechnology
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    • 제5권1호
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    • pp.1-6
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    • 2003
  • The adventitious root of Panax ginseng C.A. Meyer is regarded as an efficient alternative to cell culture or hairy root culture for biomass production due to its fast growth and stable metabolite production. To determine optimal culture conditions for the bioreactor culture of ginseng roots, experiments have been conducted on physical and chemical factors such as bioreactor type, dissolved oxygen, gas supply, aeration, medium type, macro- and micro-elements, medium supplement during culture period, sucrose concentration, osmotic agents, medium pH and light. Elicitation is a key step to increase ginsenoside accumulation in the adventitious roots but biomass growth is severely inhibited by elicitor treatment. To obtain high ginsenoside content with avoiding biomass decrease, we applied two-stage bioreactor culture system. Ginseng adventitious roots were cultured for 40 days to maximize biomass increase followed by elicitation for 7 days to enhance ginsenoside accumulation. We also experimented on types and concentrations of jasmonate to determine optimal elicitation methods. In this paper, we discussed several factors affecting the root propagation and ginsenoside accumulation. Based on the results obtained from previous experiments we have established large-scale bioreactor system (1 ton-10 ton) for the efficient production of ginseng adventitious roots and bioactive compounds including ginsenoside. Still, experiments are on going in our laboratory to determine other bioactive compounds having effects on diet, high blood pressure, DPPH elimination and increasing memories.