• Title/Summary/Keyword: Tertiary treatment

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Cost Analysis of Ocean Outfall and Tertiary Treatment Processes in Suyong Sewage Treatment Plant (수영 하수처리장 방류수의 해중 방류법과 3차 처리시설 설치시 비용 비교 분석)

  • 박해식;조은일;박청길
    • Journal of Environmental Science International
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    • v.8 no.1
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    • pp.115-123
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    • 1999
  • Sewage has been almost treated by secondary treatment process. Secondary-treated effluent of sewage treatment plant caused the pollution of nearby beach. Nitrogen(N) and Phosphorus(P) in effluent water have caused many problems on estuary, such as red tide, eutrophication and aquatic toxicity. Therefore, the effective nitrogen and phosphorus removal from sewage treatment plants is necessary to prevent those pollution problems. However, little sewage treatment plant in Korea is effectively being operated for the removal of the nutrients. This study is analyzed for the effectiveness of cost when tertiary treatment process and Ocean Outfall are applied for the water quality of Suyong Bay After secondary treatment process, the effluent was discharged from the seabed in the depth of 32m of 4000m offshore. Pollutant concentration is decreased as much as the 180 times after the result of initial dilution, so that environmental protection requirement of Suyong Bay can satisfied. This Ocean Outfall process can save the 2.6~3.5 times as much as the cost of construction and operation for tertiary treatment process running over a 20 year.

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Potential Use of Microalgae Scenedesmus acuminatus for Tertiary Treatment of Animal Wastewater (축산폐수 고도처리를 위한 미세조류 Scenedesmus acuminatus의 이용 가능성)

  • Park, Ki-Young;Lim, Byung-Ran;Lee, Ki-Say;Lee, Soo-Koo
    • Journal of The Korean Society of Agricultural Engineers
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    • v.53 no.1
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    • pp.63-69
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    • 2011
  • The green algae Scenedesmus acuminatus was cultured in different media: animal wastewater and an artificial culture medium in order to evaluate potential use for tertiary treatment. The experiments were conducted with air flowrate 1~2 L/min at $28{\sim}30^{\circ}C$. The nitrogen and phosphorus showed very similar removal efficiencies (68~77 % and 69~80 % for nitrogen and phosphorus respectively). The optimal fed period was estimated as three days in the semi-continuous experiment. The effects of $CO_2$ (4.5 %) injection on nutrient uptake from animal wastewater (biological treatment effluent) were compared to an air injection under the same conditions of light and photoperiod. The uptake rates of nutrient with air injection were observed 0.009 gN/gChl-a/day, 0.028 gN/gChl-a/day and T-P 0.003 gP/gChl-a/day for nitrate, total nitrogen and phosphorus respectively. The rates were enhanced by addition of $CO_2$ to 0.026 gN/gChl-a/day, 0.076 gN/gChl-a/day and T-P 0.018 gP/gChl-a/day. This study establishes that $CO_2$ addition during nutrient deprivation of microalgal cells may accelerate tertiary wastewater treatment.

Tertiary Treatment of Sewage by Micro Bubble Ozone and BAF System (미세기포 오존과 생물여과 시스템을 이용한 생활하수의 3차 처리에 관한 연구)

  • Kang, Dong-Han;Jang, Young-Ho;Kim, Jong-Su;Kim, Keug-Tae
    • Journal of Korean Society on Water Environment
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    • v.27 no.6
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    • pp.877-884
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    • 2011
  • In this paper, the removal characteristics of dissolved organic carbon (DOCs) by micro bubble ozonation process and $O_3/UV$ process were comparatively studied. In the point of DOC removing reaction coefficient, micro bubble ozonation system and $O_3/UV$ process had not significant difference, $0.0120sec^{-1}$ and $0.0141sec^{-1}$. Therefore micro bubble ozonation process is more suitable for tertiary treatment of sewage in the point of installation and maintenance cost-reducing. The optimum ozone injection rate was 2.0 g $O_3/g$ DOC and HRT was 3 min for the micro bubble ozonation process. The removal efficiency of DOC and SUVA in micro bubble ozonation system was 32.8% and 58.3% respective. Biological aerated filter (BAF) process was installed to remove soluble organic material increased by micro bubble ozonation system. And the effluent BOD of BAF was below 1.0 mg/L. In the view of cost-effectiveness, $O_3/BAF$ process was more profitable than $O_3/UV/BAF$ process for tertiary treatment of sewage. In order to nitrify ammonia in the BAF process completely, $NH_4{^+}-N$ concentration in the influent water of BAF should be designed considering low water temperature in the winter season.

Tertiary Treatment of Municipal Wastewater Using Unsaturated Sandy Soil (불포화 사질토양을 이용한 도시하수의 3차 처리)

  • Kim, Seung-Hyun;Chung, Jong-Bae;Ha, Hyun-Soo;Prasher, Shiv O.
    • Korean Journal of Environmental Agriculture
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    • v.22 no.2
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    • pp.111-117
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    • 2003
  • Treatment of secondary effluent was investigated using sandy soil as a possible alternative to the tertiary treatment of municipal wastewater. Secondary effluent was applied with three different flow rates to the surface of pilot scaled lysimeters, which were filled with sandy soil. Some of the lysimeters were covered with osd, while others were kept bare in order to investigate the role of plantation on the treatment. The concentration changes in COD and nitrogen were measured along the unsaturated soil depth. The same set of experiment as with the secondary effluent was performed using tap water to investigate the dissolution of the contaminants from the soil. from the results it was found that when sandy soil was used for tertiary treatment of municipal wastewater COD removal efficiency reached about 70% regardless of the application rate. The soil depth needed to obtain such efficiency increased along with the application rate, which was about 60 cm at the application rate of 50 L/day. Results also showed that nitrification occurred rapidly. The process was completed in soil depth of first $10{\sim}20\;cm$. Nitrogen removal efficiency was as low as about 20% regardless of the application rate. Some supplementary means should be considered to improve the efficiency. Sod on the soil surface had no significant influence on the contaminant treatment but was helpful to keep the infiltration rate undiminished. Finally, the organic soil was found to release significant amount of contaminants when it was in contact with soil water.

Applicability of the lenten's Reagent Oxidation to Biological Fixed-Film Process for Reuse of Effluents from the Petrochemical Wastewster Effluent Treatment Plant (석유화학폐수 처리장 방류수의 재이용을 위한 고정생물막 공정에서 Fenton 산화전처리의 적응가능성)

  • Lee, Kyu-Hoon;Kim, Mi-Hwa;Park, Tae-Joo
    • Journal of Environmental Science International
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    • v.4 no.5
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    • pp.115-115
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    • 1995
  • Reuse of industrial effluents through the cooling systems in a petrochemical complex was described. The partial oxidation of the effluents from the biological treatment plant was examined, using Fenton''s reagent as a pretreatment step prior to a next treatment of the effluents. Next tertiary treatment using fixed-film reactor resulted in marked reductions in COD and suspended solids. The continuous fixed-film process with Fenton oxidation pretreatment showed a 23% increase in the COD removal efficiency when compared to that without pretreatment of Fenton oxidation under the volumetric organic loading rate of 0.1 kg COD/m3/day. The Fenton oxidation treatment seemed to be a possible method for tertiary biological treatment to reduce the residual toxicity with the enhanced biodegradation of the effluents.

Applicability of the lenten류s Reagent Oxidation to Biological Fixed-Film Process for Reuse of Effluents from the Petrochemical Wastewster Effluent Treatment Plant (석유화학폐수 처리장 방류수의 재이용을 위한 고정생물막 공정에서 Fenton 산화전처리의 적응가능성)

  • Lee, Kyu-Hoon;Kim, Mi-Hwa;Park, Tae-Joo
    • Journal of Environmental Science International
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    • v.4 no.5
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    • pp.501-508
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    • 1995
  • Reuse of industrial effluents through the cooling systems in a petrochemical complex was described. The partial oxidation of the effluents from the biological treatment plant was examined, using Fenton's reagent as a pretreatment step prior to a next treatment of the effluents. Next tertiary treatment using fixed-film reactor resulted in marked reductions in COD and suspended solids. The continuous fixed-film process with Fenton oxidation pretreatment showed a 23% increase in the COD removal efficiency when compared to that without pretreatment of Fenton oxidation under the volumetric organic loading rate of 0.1 kg COD/m3/day. The Fenton oxidation treatment seemed to be a possible method for tertiary biological treatment to reduce the residual toxicity with the enhanced biodegradation of the effluents.

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Development of Biological Filtration Process for Effective Nitrogen Removal in Tertiary Treatment of Sewage (생물막 여과반응기를 이용한 고도질소 제거법의 개발)

  • Jeong, Jin-Woo;Kim, Sung-Won;Tsuno, Hiroshi
    • Journal of Korean Society on Water Environment
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    • v.22 no.2
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    • pp.222-229
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    • 2006
  • The treatment performance and operational parameters of a tertiary wastewater treatment process a biological filtration system were investigated. The biological filtration system consisted of a nitrification filter (Fiter 1) and a polishing filter with anoxic and aerobic parts (Filter 2). SS, T-C-BOD, and T-N in effluent were kept stable at less than 3, 5 mg/L, and 5 mgN/L, respectively, under a HRT in Filter (filter-bed) of 0.37~2.3 h. T-N at the outlet of Filter 2 were about 1~5 mgN/L under the condition of LV of 50~202 m/d. In Filter 2, denitrification was accomplished under LV of 50~168 m/d in a 1 m filter-bed. However, the denitrification capacity reached the maximum when the linear velocity was increased to 202 m/d. Relationship between increase in microorganism and headloss was clearer in Filter 2. As a result, the denitrification rate increased from 1.0~2.3 kgN/($m^3-filter-bed{\cdot}d$) as the headloss increased. The COD removal rate was 6.0~9.6 kgCOD/($m^3-filter-bed{\cdot}d$) when operated with Filters 1 and 2. These results mean that captured bacteria contributed a part of COD consumption and denitrification. The maximum nitrification and denitrification rate was 0.5 and 4 kgN/($m^3-filter-bed{\cdot}d$) in Filter 1 and 2.The ratio of backwashing water to the treated water was about 5~10 %. In Filter 1, wasted sludge in backwashing was only 0.7~5.3 gSS/($m^3$-treated water). In Filter 2, added methanol was converted into sludge and its value was 8.0~24 gSS/($m^3$-treated water). These results proved that this process is both convenient to install as tertiary treatment and cost effective to build and operate.