• Title, Summary, Keyword: food wastewater

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A Study on the Mixed-Food Wastewater Treatment in an Anaerobic Packed Bed Reactor and Sludge Bed Reactor (혐기성 고정상반응기와 슬러지 Bed반응기에서 혼합-식품폐수처리에 관한 연구)

  • 안재동;김재우;장인용
    • Journal of Environmental Health Sciences
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    • v.19 no.4
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    • pp.38-43
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    • 1993
  • The characteristics of food wastewater treatment in an anaerobic packed bed reactor (APBR) with polyurethane as a packing material and sludge bed reactor (ASBR) was studied. The reactor of 9cm-ID, 150cm-height was fed in a continuous mode from bottom of reactor. For the purpose of constant temperature of reactor, water jacket was installed. The used packing materials was polyurethane sponge foam. Methane which was produced by decomposed organics collected at the top of the reactor for using as a fuel. The substrates used were synthetic, mixed and food wastewater. For the acclimatization of microorganisms, mixed wastewater was used. The major analyses were gas production, COD, pH and volatile acids. Based upon the completed works, the results are as follows: When food wastewater was fed the quantity of produced gas was less than that of synthetic wastewater, but food process saw higher methane content than synthetic process. As well as COD removal efficiency of food process reached at about 85%. In aspect of effluent volatile acid, food process showed low concentration of below 500 mg/l, therefore anaerobic reaction stabled. Conclusively food wastewater used can be digested by anaerobic treatment, especially anaerobic packed bed reactor showed 82% of COD removal, 75% of methane content, 10 l of gas production, and anaerobic sludge bed reactor did 79% of COD removal, 75% of methane content, 81 of gas production at 4 kgCOD/m$^3$day, 36$\circ$C.

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Application and Development of Activated Carbon Adsorption in Wastewater

  • Zhang, DianYa;Deng, ChengXun;Deng, Xu;Yu, ZhiMin
    • Journal of Urban Science
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    • v.8 no.2
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    • pp.19-23
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    • 2019
  • With the continuous progress of modern science and technology and the rapid development of economy, with the continuous development of society, the treatment of industrial and domestic sewage has become a hot concern. Toxic substances and non-degradable pollutants in wastewater also have a great impact on the environment. This paper mainly expounds the current environmental situation and the adsorption mechanism of activated carbon. And the application and development of activated carbon adsorption in wastewater.

Characteristics of the Food Waste and Wastewater Discharged from Food Waste Treatment Process (음식물류폐기물 및 배출폐수의 특성)

  • Kim, Young-Kwon;Kim, Se-Mi;Kim, Min-Kyu;Choi, Jin-Taek;Nam, Se-Yong
    • Journal of Environmental Health Sciences
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    • v.35 no.6
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    • pp.526-531
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    • 2009
  • Waste generation was generally expected to steadily rise due to a rapid increase in population and economic growth. However, regulations on disposable goods and a volume-based waste fee system have led to a gradual reduction in the amount of waste. In the case of food waste, separation of food waste from other waste has been put in place since direct landfilling was banned in January 2005. The predicted generation amounts of food waste and wastewater in the model city were 54 ton/d and 127.3 ton/d by year 2020, respectively. However, appropriate treatment technologies for food waste and wastewater discharged from food waste treatment processes are yet to be established. In this study, the food waste and wastewater discharged from food waste treatment process in the model city were characterized by literal and field investigation.

Hydrogen Production and Organic Removal according to Mixture Ratio of Food Wastewater and Swine Wastewater using Anaerobic Batch Reactor (회분식 혐기성 소화 반응기에서 음식물탈리액과 양돈폐수의 혼합비에 따른 수소 생산 및 유기물 제거)

  • Kim, Choong-Gon;Kang, Seon-Hong
    • Journal of Korean Society of Water and Wastewater
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    • v.21 no.5
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    • pp.641-647
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    • 2007
  • This study aims to find out optimum condition for hydrogen production and organic removal when treating food and swine wastewater together. For this purpose, various batch tests were conducted by changing mixture ratio from 6:4 (food wastewater:swine wastewater) to 1:9 without pretreatment process. For hydrogen production through anaerobic fermentation, the mixture ratios of R-1 (6:4), R-2 (5:5) and R-6 (1:9) were out of pH range appropriate for hydrogen production and mixture ratios of R-3 (4:6), R-4 (3:7), and R-5(2:8) showed appropriate hydrogen production where their pH ranges were 5.1~5.5. Especially in case of R-3, it consistently maintained appropriate pH range for hydrogen production for 72hr and produced maximum hydrogen. The characteristics of hydrogen production and cumulative hydrogen production according to each mixture ratio showed that R-1, R-2 and R-6 did not produce any hydrogen, and maximum hydrogen productions of R-3, R-4 and R-5 were 593ml, 419ml and 90ml, respectively. Total cumulative hydrogen productions of R-3, R-4 and R-5 were 1690ml, 425ml and 96ml, respectively. Based on previous results, it was concluded that, the most appropriate mixture ratio of food wastewater and swine wastewate rwas 4:6 (R-3). The experiment for COD removal rate to evaluate organic removal efficiency revealed that R-3, R-4 and R-5 showed high removal efficiencies during the highest hydrogen production amount and the highest efficiency was 41% with R-3.

Hydrogen and Methane Production from Mixture of Food Wastewater and Swine Wastewater using Two-Phase Anaerobic Process (이상 혐기성 공정을 이용한 음식물류폐기물폐수와 양돈폐수의 혼합액으로부터 수소 및 메탄 생산)

  • Kim, Choong-Gon;Kang, Seon-Hong
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.3
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    • pp.299-306
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    • 2008
  • This study has been conducted to derive the bio-energy, hydrogen and methane production, from mixture of food wastewater and swine wastewater, the high strength organic wastewater and to increase effluent quality. To overcome this limitation in one-phase anaerobic process, two-phase anaerobic process combining hydrogen fermenter and methane fermenter was applied. In this system $2,323ml\;H_2/L$ was produced daily from Run II where 500 ml of heattreated sludge in methane fermenter was injected, and methane produced from methane fermenter did not show big difference regardless of the amount of returning sludge at each Run. It was concluded that the two-phase anaerobic process was the appropriat process to produce hydrogen and methane simultaneously and stably. Influent $TCOD_{Cr}$ to two-phase anaerobic process showed the range of 132~145 g/L(average 140 g/L), and effluent $TCOD_{Cr}$ range was 25~40 g/L(average 32 g/L), and organic removal efficiency showed 71~82%(average 76.3%).

Biological treatment process for Food wastewater Using ER-1 bioreactor (다단 수직형 호기성반응기(ER-1)를 이용한 음식물 폐수의 생물학적 처리기술)

  • Lee, Jae-ki;Choi, Hong-Bok;Shin, Eung-Bai;Park, Ju-Hyoung;Choi, Eun-Ju;Kim, Jung-Rae;Park, Young-Sook
    • Journal of the Korea Organic Resources Recycling Association
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    • v.14 no.4
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    • pp.113-120
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    • 2006
  • Wastewater generated through the food waste recycling process have known high concentration, BOD 20,000~150,000 mg/L, which has to treat to the proper level because of a ban on reclamation. But it is impossible to treat less than 10 days by existing water treatment plant. Ecodays Ltd. is to treat this wastewater during 2~4 days by ER-1, which can simultaneously induce the modified PFR(Plug Flow Reactor) of the oxygen transfer rate, MLVSS concentration, and influent concentration to top from bottom of reactor. We tested the pilot test about low concentration food wastewater(BOD 16,500 mg/L) and high concentration food wastewater(64,431 mg/L) at the food waste recycling plant of H-Gun(20t/d). Hydraulic retention time(HRT) of ER-1 for low concentration food wastewater is 2.5day. In low concentration conditions, ER-1 treatment efficiency is to appear BOD 99%, COD 98%, TN 97%, and TP 96%. While ER-1 process for high concentration food wastewater treatment is composed 2 stages, which are to be HRT 2.5day for law wastewater and HRT 1.5 day for secondary treatment. In high concentration conditions, ER-1 treatment efficiency is to appear BOD 97%, COD 84%, TN 66%, and TP 95%. It is treated without temperature control about high temperature($50^{\circ}C$) to appear low treatment efficiency in high concentration conditions.

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A Study on the Cause of Scale Formation in Biogas Plant with Food Wastewater (음식물류 폐수를 이용한 바이오가스 생산시설의 스케일 형성요인에 관한 연구)

  • Bae, Young-Shin;Chun, Seung-Kyu
    • Journal of Korean Society of Environmental Engineers
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    • v.35 no.9
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    • pp.660-665
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    • 2013
  • To find out the major cause of scale formation in digestion facility, a componential analysis of scale and a digestion experiment for food wastewater were conducted. The analysis indicated that grease in food wastewater was closely connected to the organic component of scale. It is also indicated that grease-removed food wastewater showed 58.9% level compared to unprocessed one in crystal generation quantity in this study. The experiment provided insight that grease is one of the important causes of scale formation. Additionally, pre-removal of grease from food wastewater did not show negative effect on digestion gas production, as 68.7 L-gas/kg-COD for grease-removed food wastewater and 67.7 L-gas/kg-COD for unprocessed one.

Uptake of Wastewater Organic Matter to Activated Sludge

  • Nam, Se-Yong;Kim, In-Bae
    • Journal of Environmental Health Sciences
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    • v.33 no.6
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    • pp.493-496
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    • 2007
  • The influences of contact time and ratio of food to microorganism (F/M) on uptake of wastewater organic matter in a short contact process were investigated using three activated sludge batch reactors fed with synthetic wastewater, sewage and livestock wastewater. About 64% of influent soluble chemical oxygen demand (SCOD) in the synthetic wastewater and 61% of SCOD in the sewage and 43% of SCOD in the diluted livestock wastewater were adsorbed into the activated sludge within 30 min. The specific mass of organic matter uptaken in the synthetic wastewater was 55 mg SCOD/g mixed liquor suspended solids (MLSS). In the same manner, 20 and 14 mg SCOD/g MLSS were calculated as the values in the sewage and livestock wastewater, respectively.

Treatment of Rice-Washing Wastewater by ph Adjustment (ph 조절에 의한 쌀세척 폐수의 처리)

  • 노홍균;김지숙;이문이;조영인
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.23 no.4
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    • pp.660-665
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    • 1994
  • Treatment of rice-washing wastewater was considered under various pH levels and chitosan concentrations. Compared with the control test, addition of chitosan at the various concentrations did not noticeably enhanced turbidity reduction at pH 4 and 5 , but greatly enhanced at above pH 6. However, reduction of turbidity in the wastewater, irrespective of chitosan concentrations, was the greatest at pH 4 and became lower by increasing pH. Suspended solids in the wastewater were the most effectively recovered by pH adjustment of the wastewater to 4 followed by centrifugation, with over 99% reduction in turbidity . Different concentrations of suspended solids in the wastewater and various kinds of acids used for p/H adjustment did not affect turbidity reduction. Increasing storage periods of the wastewater resulted in lower reductions in turbidity.

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Treatment of Food Processing Wastewater bearing Furfural by Candida utilis (Candida utilis를 이용한 furfural 함유 식품가공 폐수의 처리)

  • 박기영;정진영
    • KSBB Journal
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    • v.18 no.4
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    • pp.272-276
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    • 2003
  • A yeast treatment process was applied to treat food processing organic wastewater containing inhibitory material to anaerobic bacteria. The wastewater contained high concentration of the furfural as a by-product from the food processing. Aerobic yeast (Candida utilis) was selected to remove organics in wastewater. The batch test showed that the wastewater had an inhibition to anaerobic bacteria. The optimum level of temperature for yeast treatment was ranged from 25 to 45$^{\circ}C$. The pH range from 4 to 8 was favorable to yeast growth. The continuous flow reactor was operated at various SRTs. The results were satisfactory with the reduction of COD up to 90% at SRT of more than 1 day. Through the kinetic study of the yeast, the remained COD concentration was mainly caused by the formation of soluble microbial product (SMP).