• 제목/요약/키워드: Water Concentration

검색결과 11,852건 처리시간 0.042초

횡성호의 유기물 수지 및 거동 특성 (Organic Matters Budget and Movement Characteristic in Lake Hoengseong)

  • 정승현;박혜경;윤석환
    • 한국물환경학회지
    • /
    • 제28권2호
    • /
    • pp.238-246
    • /
    • 2012
  • Organic matters budget in Lake Hoengseong were monthly investigated from April 2009 to November 2009. The intense rainfall occurred at between July and August and the hydrological factors were highly varied during the rainfall season. By the concentrated rainfall, the elevation, influx and efflux were sharply increased and the turbid water was also flowed into the middle water column in Lake. The inflow of turbid water increased the nutrient concentrations in water body and this appears to stimulate of phytoplankton regard as the primary productivity of influx of organic matter. Monthly average concentration of dissolved organic carbon (DOC) was generally higher than the particulate organic carbon (POC) concentration in Lake, but Temporal and spatial variation of POC concentration was higher than DOC and the maximum POC concentration was recorded in surface water in August, had the highest phytoplankton biomass. Organic carbon concentration in inflow site was rarely changed during the dry season, but the concentration was rapidly increased by the initial intense rainfall. In organic matters budget, the most of the organic matters was inflowed from the inflow site at rainfall season. Especially, the influx of allochthonous organic matters during the intense rainfall was 72.4% in the total influx organic matters.

바이오필름 반응기상에서 수소 이용성 독립영양생물을 이용한 고농도 탈질 반응 (Autohydrogenotrophic Denitrification of High Nitrate Concentration in a Glass Bead Biofilm Reactor)

  • 박호일;김지성;김동건;박대원
    • 한국물환경학회지
    • /
    • 제20권3호
    • /
    • pp.236-240
    • /
    • 2004
  • Autohydrogenotrophic denitrification of high nitrate concentration contaminated wastewater in a batch-scale biofilm reactor has been investigated. High nitrate concentration decreased as pH increased from 7.01 to 9.45. The high nitrate concentrations continuously decrease from $150mg.l^{-1}$ to $0mg.l^{-1}$. Nitrite concentrations increase at about two-thirds way through the denitrification process and thereafter it decreases with time. Autohydrogenotrophic denitrification of high nitrate concentration is passible to use drinking water as well as wastewater, and to deal with wastewater treatment by hetrotrophic denitrification.

유과 반죽의 콩물 농도 및 Incubation time과 포장방법이 유과의 저장 중 품질 특성에 미치는 영향 (Effect of Bean Water Concentration and Incubation Time of Yukwa Paste and Packaging Method on the Quality of Yukwa)

  • 조미나;전형주
    • 한국식품과학회지
    • /
    • 제33권3호
    • /
    • pp.294-300
    • /
    • 2001
  • 저장 방법의 차이에 따른 유과의 과산화물가는 대바구니 포장이 가장 높았으며, 질소 치환 포장, 냉동 저장 순으로 나타났고, 저장 기간 증가에 따라 현저히 증가하였다. 콩물 농도가 증가함에 따라 과산화물가도 증가하였으나 incubation 시간 증가에 따른 차이는 유의적이지 않았다. 유과의 hardness는 콩물 농도, incubation 시간과 저장 기간의 증가에 따라 현저한 감소를 나타냈으나 저장 방법간에는 유의적인 차이를 나타내지 않았다. Peak number는 저장 기간 10주까지는 냉동 저장군이 다른 군보다 높게 나타났으나, 12주에는 이러한 차이가 나타나지 않았고, 저장 기간 증가에 따라서 증가하였다. 저장 3개월 후 관능 검사 결과, 유과의 색은 저장 방법과 콩물의 농도에 따라서 용적 증가율은 콩물 농도와 incubation 시간에 따라 유의적인 차이가 있었다. 산패취는 저장 방법에 따라서만 유의적인 차이가 있었으며, 부드러운 정도, 맛, 종합적 기호도는 콩물의 농도에 따라서만 유의적 차이가 있었다.

  • PDF

Treatment of high-salinity wastewater after the resin regeneration using VMD

  • Gao, Junyu;Wang, Manxiang;Yun, Yanbin
    • Membrane and Water Treatment
    • /
    • 제9권1호
    • /
    • pp.53-62
    • /
    • 2018
  • In this study, vacuum membrane distillation (VMD) was used to treat high-salinity wastewater (concentration about 17%) discharged by chlor-alkali plant after resin regeneration. The feasibility of VMD for the treatment of real saline wastewater by using Polyvinylidene fluoride (PVDF) microporous plate membrane with a pore diameter of $0.2{\mu}m$ was investigated. The effects of critical operating parameters such as feed temperature, velocity, vacuum degree and concentration on the permeate water flux were analyzed. Numerical simulation was used to predict the flux and the obtained results were in good agreement with the experimental data. The results showed that an increase in the operating conditions could greatly promote the permeate water flux which in turn decreased with an increase in the concentration. When the concentration varied from 17 to 25%, the permeate water flux dropped marginally with time indicating that the concentration was not sensitive to the decrease in permeate water flux. The permeate water flux decreased sharply until zero due to the membrane fouling resistance as the concentration varied from 25 to 26%. However, the conductivity of the produced water was well maintained and the average value was measured to be $4.98{\mu}s/cm$. Furthermore, a salt rejection of more than 99.99% was achieved. Overall, the outcome of this investigation clearly indicates that VMD has the potential for treating high-salinity wastewater.

A STUDY ON THE ELIMINATION OF FLUORIDE IN A HOT SPRING WATER

  • Lee, Hyeon-Ki;Kim, Hwan-Gi
    • Environmental Engineering Research
    • /
    • 제11권2호
    • /
    • pp.77-83
    • /
    • 2006
  • The hot spring water of the north Jeonla province such as Wanggung, Jookrim, Seokjung, and Hwasim, has fluoride concentration of 3.9 mg/L, 12.7 mg/L, 1.9 mg/L, and 6.3 mg/L, respectively. These figures fairly exceed the Korean and WHO standard for potable water, which is 1.5 mg/L. Therefore, in this study, research on elimination of fluoride in a hot spring water of Jookrim region, which has the highest level of fluoride concentration level in the north Jeonla province, was carried out. In analysis of Jookrim hot spring water according to the water quality standard for potable water, pH was very high at 9.25 and the concentration of fluoride was 10 times higher than the standard at 18.2 mg/L. Other measurements were within the standard or not detected. After injecting 10g of activated carbon for elimination of fluoride, the fluoride concentration was measured at 13.5 mg/L, and when 70mL or more of alum 10 g/L solution was injected, the concentration was measured at 2.8 mg/L, and injecting 3g of lime was measured at 9 mg/L. Alum showed the best elimination performance among all individual injections. Injection of 25 mL of activated carbon and 100 mL of alum solution together reduced the fluoride concentration down to 1.3 mg/L, which is under the potable standard. Injection of lime 1g and 75 mL of alum 10 g/L solution together reduced fluoride concentration to 4.1 mg/L. From the modifying HRT, by using ion exchange resin column, the pH was stabilized when HRT was Imin and showed range of $6.7{\sim}7.8$. The fluoride concentration reduced gradually as the HRT increased, and satisfied the potable standard when HRT passed 6 min, and after 30 min HRT, the concentration of fluoride was 0.05 mg/L: almost eliminated.

소규모 정수처리장에서 모니터링 자료를 이용한 원수의 망간농도 예측에 관한 연구 (Estimation for Raw Water Quality of Manganese Concentrations from Archived Data in Small-scale Water Systems)

  • 민병대;야마자키 키미코;코이즈미 아키라;구자영
    • 상하수도학회지
    • /
    • 제25권4호
    • /
    • pp.547-554
    • /
    • 2011
  • In small-scale water systems, the measurement of quality of raw water in running water is generally implemented when the quality of water is stable and frequency of measurement is low. However, units such as water temperature and pH, which are easily monitored, are frequently measured. In establishing an improvement plan for a water treatment system, the range of concentration of the target material present in the raw water of the running water provides relevant information. If the concentration of target material can be specified by the quality of water of data items that are measured daily, inverse estimation of the range of concentration is possible as well. In this paper, we took note of manganese in the raw water from Ogasawara-mura, Tokyo, and estimated the manganese concentration in the raw water of the running water for the past five years. Based on the results obtained, we have proposed a manganese removal system, considering the current situation and geographical conditions of Ogasawara-mura.

준설토의 침강형태에 관한 연구 (Settling Mode of the Dredged Soil)

  • 윤상묵;장병욱;차경섭
    • 한국농공학회지
    • /
    • 제45권1호
    • /
    • pp.63-73
    • /
    • 2003
  • The settling of the dredged soil may vary with mineral composition, grain size distribution, initial water content and salt concentration of suspension of the site. A series of settling column test was performed to investigate the behaviour of solid suspension material from dredging and reclamation. Settling mode was divided into four types from the observation of interface and settling curves of clay minerals and marine clay samples, and the relationship charts of salt concentration and the initial water content were established to use in the dredging operation with any salt concentration. The critical initial water content which was defined as a threshold of zone settling and the consolidation settling was varied with salt concentration of water and was proportional to the plasticity of soil in sea water.

광역논에서의 질소 .인의 농도와 오염부하량 특성 (Characteristics of Concentration and Load of Nitrogen and Phosphorous in Paddy Field Areas)

  • 김진수
    • 한국농공학회지
    • /
    • 제41권4호
    • /
    • pp.47-56
    • /
    • 1999
  • The concentration and load of T-N and T-P in paddy field areas in Chongwon, Chungbuk , Korea , were investigated during the irrigation period. The concentration of T-N and T-P in ponded water in paddies is higher than that in the irrigation, drainage and percolation waters. For T-N, the average concentration indrainage water was higher than that in irrigation water until end of Jung, But lower thereafter. The average T-N concentration in irrigation water was 2.3 ∼3.2mg/l and therefore the agricultural water quality standard at on-farm level for T-N should be established realistically . The expontial L(load)-Q(discharge) equations have higher coefficients of determination than the linear L-Q equations . Especially, the exponential L-Q equation of T_N showed a coefficient of determinatino of over 0.9 for irrigation water.

  • PDF

유역하수도 공공하수처리시설의 방류수 수질 준수농도 설정방안 연구: 진위천 수계를 중심으로 (A study on Determination Method of the Compliance Concentration of Effluent Limitation from Public Sewage Treatment Works in the Jinwee-stream Watershed Sewer System)

  • 정동환;조양석;김영석;안경희;정현미;권오상
    • 상하수도학회지
    • /
    • 제29권4호
    • /
    • pp.493-502
    • /
    • 2015
  • In accordance with the Watershed Sewer System Maintenance Plan enforced on February 2, 2013, the different compliance concentration of effluent limit be applied to effluent discharged from public sewage treatment works(PSTWs) in each watershed on the basis of water quality thereof. With the introduction of watershed sewer system, it is necessary to set the compliance concentration of effluent limit for PSTWs situated in the watershed, by region and PSTW size, to achieve water quality criteria for regional watersheds or target water quality under TMDL program. Watershed Environmental Agencies establish the Watershed Sewer System Maintenance Plan and set the compliance concentrations of effluent limit for PSTWs under the plan. The agencies plan to apply tougher effluent BOD concentration limits in Class I to IV areas. Effluent BOD concentration limits will be toughened from 5~10 mg/L to 3 mg/L in class II~III areas, from 10mg/L to 5mg/L in class IV areas. Uniform application of effluent BOD concentration limits to PSTWs in the watershed sewer system need to be complemented considering type of sewage treatment technology employed and watershed characteristics. Therefore, this study presents method to determine the compliance concentration of effluent limit from PSTWs in the watershed.

담수 이후 용담호 영양상태 변동 요인 분석 (Analysis of Trophic State Variation of Lake Yongdam in Dam Construction)

  • 유순주;채민희;황종연;이재안;박종겸;최태봉
    • 한국물환경학회지
    • /
    • 제21권4호
    • /
    • pp.360-367
    • /
    • 2005
  • We have performed to analyze the trophic state resulting of Lake Yongdam as a result of water quality and nutrient concentration. Lake Yongdam is artifitial multi-purpose Dam resulting from the floods of 2001. The water quality of Lake Yongdam may affect the status of the Geum river basin including the Daecheong reservoir. It is necessary to understand the trophic state to assess water quality until stability after flooding. Water quality was surveyed using depth and hydraulic condition analysis. Further density flow was estimated for stratification and trophic state of Lake Yongdam by chlorophyll ${\alpha}$ concentration (2001~2004). And Environmental factors on chlorophyll ${\alpha}$ concentration were analyzed statistically. Trophic state was evaluated as the oligotrophic state at the main stream of the reservoir and eutrophic state at the upper stream in 2001, but evaluated as eutrophic state in 2002 and 2003 by TSI of Aizaki. From the results of multiple regression analysis using stepwise method, chlorophyll ${\alpha}$ concentration was shown to be very significant when nutrient concentration is high upon initial filling of the Dam. Chlorophyll ${\alpha}$ concentration varied according to sample site, season and year. Concentration were high in the upper stream of Lake Yongdam 4, algae bloom in these watershed were affected by location and high nutrient levels in the summer season which have in turn increased phytoplankton bloom into the reservoir.