• 제목/요약/키워드: Phosphorus Removal

검색결과 290건 처리시간 0.095초

하수처리시설에서 인 고도처리를 위한 일체형 침전부상공정(SeDAF)의 응집제 주입농도 자동제어기법 검토 (Automatic control of coagulant dosage on the sedimentation and dissolved air flotation(SeDAF) process for enhanced phosphorus removal in sewage treatment facilities)

  • 장여주;정진홍;김원재
    • 상하수도학회지
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    • 제34권6호
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    • pp.411-423
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    • 2020
  • To remove phosphorus from the effluent of public wastewater treatment facilities, hundreds of enhanced phosphorus treatment processes have been introduced nationwide. However, these processes have a few problems including excessive maintenance cost and sludge production caused by inappropriate coagulant injection. Therefore, the optimal decision of coagulant dosage and automatic control of coagulant injection are essential. To overcome the drawbacks of conventional phosphorus removal processes, the integrated sedimentation and dissolved air flotation(SeDAF) process has been developed and a demonstration plant(capacity: 100 ㎥/d) has also been installed. In this study, various jar-tests(sedimentation and / or sedimentation·flotation) and multiple regression analyses have been performed. Particularly, we have highlighted the decision-making algorithms of optimal coagulant dosage to improve the applicability of the SeDAF process. As a result, the sedimentation jar-test could be a simple and reliable method for the decision of appropriate coagulant dosage in field condition of the SeDAF process. And, we have found that the SeDAF process can save 30 - 40% of coagulant dosage compared with conventional sedimentation processes to achieve total phosphorus (T-P) concentration below 0.2 mg/L of treated water, and it can also reduce same portion of sludge production.

파일럿 플랜트 규모에서 일체형 침전부상공정 (SeDAF)의 설계인자 및 운전특성에 대한 실증적 평가 (Empirical evaluation for design parameters and operating characteristics of the integrated sedimentation and dissolved air flotation (SeDAF) process at the pilot-scale plant)

  • 장여주;정진홍;임현만;김원재
    • 상하수도학회지
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    • 제35권1호
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    • pp.1-14
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    • 2021
  • Eutrophication and algal blooms can lead to increase of taste and odor compounds and health problems by cyanobacterial toxins. To cope with these eco-social issues, Ministry of Environment in Korea has been reinforcing the effluent standards of wastewater treatment facilities. As a result, various advanced phosphorus removal processes have been adopted in each wastewater treatment plant nation-widely. However, a lot of existing advanced wastewater treatment processes have been facing the problems of expensive cost in operation and excessive sludge production caused by high dosage of coagulant. In this study, the sedimentation and dissolved air flotation (SeDAF) process integrated with sedimentation and flotation has been developed for enhanced phosphorus removal in wastewater treatment facilities. Design and operating parameters of the SeDAF process with the capacity of 100 ㎥/d were determined, and a demonstration plant has been installed and operated at I wastewater treatment facility (located in Gyeonggi-do) for the verification of field applicability. Several empirical evaluations for the SeDAF process were performed at demonstration-plant scale, and the results showed clearly that T-P and turbidity values of treated water were to satisfy the highest effluent standards below 0.2 mg/L and 2.0 NTU stably for all of operation cases.

(AO)$_2,$ SBR과 $A_2O$ SBR의 유기물, 질소 및 인의 제거에 관한 연구 (A Study on the Organic, Nitrogen and Phosphorus Removal in (AO)$_2$ SBR and $A_2O$ SBR)

  • 박영식;우형택;김동석
    • 한국환경보건학회지
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    • 제31권4호
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    • pp.340-348
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    • 2005
  • Laboratory scale experiments were conducted to compare the performance of two types of sequencing batch reactor(SBR) systems, anoxic-oxic-anoxic-oxic $((AO)_2)$ SBR and anoxic-oxic-anoxic $(A_2O)$ SBR on the biological nitrogen and phosphorus removal. Also, the profiles of DO and pH in reactors were used to monitor the biological nutrient removal in two SBRs. The break point in the pH and DO curves at the oxic period coincided with the end of nitrifying activity at about 1 h 30 min in oxic phase, and the change in pH appears to be related to nitrate concentration. The TOC removal efficiency in $A_2O$ SBR was higher than that in $(AO)_2$ SBR. The denitrification was completed at the influent period. The 2nd non-aeration and aeration periods were not necessary for the nitrogen and phosphorus removal because of the low influent TOC concentration in this study. The release and uptake of phosphorus in $AO_2$ SBR was much higher than that in $(AO)_2SBR.$ In order to uptake more phosphorus, the 1st aeration period in $A_2O$ SBR should be prolonged.

Effects of Fermented Leachate of Food Waste (FLFW) and Temperature on Nutrient Removal in Sequencing Batch Reactor

  • Roh, Sung-Hee;Chun, Young-Nam;Lee, Sook-Young;Cheong, Hyeon-Sook;Lee, Jae-Wook;Kim, Sun-Il
    • Environmental Engineering Research
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    • 제13권3호
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    • pp.155-161
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    • 2008
  • This study examined effects of the fermented leachate of food waste (FLFW) on nitrogen and phosphorous removal for domestic wastewater containing a low carbon-to-nitrogen (C/N) ratio in sequencing batch reactor (SBR). When the FLFW was not supplied in the process, release of phosphorus and excessive intake was not observed at both anaerobic and aerobic stages. On the other hand, when the FLFW was gradually added, active release of phosphorus and intake of phosphorus was noticed at an anaerobic stage and aerobic stage, respectively, resulting in improved phosphorus removal efficiency. The removal efficiency of nitrogen and phosphorus was increased from 75% and 37% (R-1, control test) to 97% and 80% (R-4, the highest substrate ratio test), respectively. In addition, although activity of the nitrogen oxidizing microorganisms was reduced when the reaction temperature was decreased to $10^{\circ}C$, the phosphorus removal efficiency was shown to increase with the addition of FLFW, indicating an independence from temperature. Overall, this study suggests that an efficient nutrients removal process can be successfully employed into a SBR when the FLFW is added to a wastewater which has a low C/N ratio.

음식물쓰레기 세정산발효액을 외부탄소원으로 주입한 SBR 공정에서 질소 및 인 제거 (Nitrongen and Phosphorus Removal using Elutriated Acids of Food Waste as an External Carbon Source in SBR)

  • 권구호;김시원;이민재;민경석
    • 한국물환경학회지
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    • 제22권3호
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    • pp.462-467
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    • 2006
  • An improvement of nitrogen and phosphorus removal in SBR using the elutriated acids from the food waste as an external carbon source was investigated in this study. The food waste was elutriated at $35^{\circ}C$ and pH 9 to produce the external carbon source. The elutriate of food waste were continuously collected. The elutriated liquid contained VFAs of 39,180 mg/L representing soluble COD of 44,700 mg/L. The SBR showed poor denitrification and EBPR (enhanced biological phosphorus removal) without elutriated VFAs addition. An average denitrification rate was 0.4 mg NOx-N/g MLVSS/day. In turn, EBPR was also inhibited by this poor denitrification because the remaining nitrate in anaerobic phase resulting a poor denitrification. On the other hand, the denitrification in anoxic phase significantly improved with an elutriated VFAs addition. Nitrate removal was 82% while the denitrification rate was 2.9 mg NOx-N/g MLVSS/day with 18.4 mL/cycle of elutriated VFAs. With the enhanced denitrification, nitrate concentration in anaerobic phase could effectively be controlled to a very low level. The elimination of nitrate inhibition in anaerobic phase resulted enhancement of EBPR. The specific phosphate release rate was $1.9mg\;PO_4^{3-}-P/g\; MLVSS/day$ with less than 0.5 mg/L of $PO_4^{3-}-P$ concentration.

시공간 동시분할 공정 시뮬레이션을 통한 질소 및 인 제거 최적화 방안 (Optimization of Nitrogen and Phosphorus Removal of Temporal and Spatial Isolation Process by Model Simulation System)

  • 유동진;장덕;신형수;박상민;홍기호;김수영;김명준
    • 한국물환경학회지
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    • 제23권2호
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    • pp.206-215
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    • 2007
  • The objective of this study was to establish the optimal system operating strategies for nitrogen and phosphorus removal through model simulation system built for advanced wastewater treatment targeting on simultaneous temporal/special phase isolation BNR process. The simulation system was built with unit process modules using object modules in GPS-X code. The system was well verified by field experiment data. Simulation study was carried out to investigate performance response to design and operation parameters, i.e. hydraulic retention time (HRT), solids retention time (SRT), and cycle time. The process operated at HRTs of 10~15 hours, longer SRTs, and cycle time of 2 hours showed optimal removal of nitrogen. The HRTs of 10~15 hours, SRTs of 20~25 days, and longer cycle time was optimal for phosphorus removal. Both simulation and field studies showed that optimal operating strategies satisfying both the best nitrogen and phosphorus removals include HRTs ranged 10~15 hours, SRTs ranged 20~25 days, and cycle times of 4~8 hours. The simulation system with modularization of generalized components in BNR processes was, therefore, believed to be a powerful tool for establishing optimal strategies of advanced wastewater treatment.

무기탄소원으로서의 NaHCO3가 미세조류 Scenedesmus dimorphus의 성장에 미치는 영향 평가 (Effects of sodium bicarbonate as an inorganic carbon source on the growth of scenedesmus dimorphus)

  • 주성진;장산;최경진;이석민;황선진
    • 상하수도학회지
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    • 제28권5호
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    • pp.555-560
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    • 2014
  • This study investigates the effect of sodium bicarbonate ($NaHCO_3$) on growth of S.dimorphus. $NaHCO_3$ concentration was varied from 0 to 2 g-C/L. As a result, the increase in concentration of $NaHCO_3$ up to 1.5 g-C/L increased dry weight of algae. The highest specific growth rate of S. dimorphus was $0.36day^{-1}$ which was obtained at concentration of 0.5 g-C/L $NaHCO_3$. pH showed a large variation range at the concentrations lower than 0.5 g-C/L $NaHCO_3$ whereas inorganic carbon, nitrate and phosphorus removal rates were almost same at the concentrations higher than 0.5 g-C/L $NaHCO_3$ (0.75, 1, 1.25, 1.5, 2 g-C/L $NaHCO_3$). Their average inorganic carbon, nitrate and phosphorus removal rate were 70 mg-C/L/d, 11.3 mg-N/L/d, and 1.6 mg-P/L/d, respectively. Thus, $NaHCO_3$ didn't effect on inorganic carbon, nitrate and phosphorus removal rate of S. dimorphus.

스트루바이트 생성을 통한 하수슬러지 탈수여액 내 인 제거 (Phosphorus removal from dewatering centrate in wastewater treatment by struvite formation)

  • 김상현;박종훈;주현준
    • 유기물자원화
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    • 제21권2호
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    • pp.71-78
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    • 2013
  • 하수처리 탈수여액 내에 존재하는 고농도 인을 스트루바이트 생성을 통해 제거하기 위한 타당성 조사를 수행하였다. 혐기 소화를 거친 탈수여액 내에는 암모니아가 인산염 보다 높은 농도로 존재하므로 별도의 질소 투입 없이 마그네슘 주입과 pH 조절만을 통해 인 제거가 가능하였다. 인 제거 효율은 마그네슘 주입량, 교반 시간, 침전 시간, pH에 영향을 받았으며, 최적 반응 조건은 $Mg^{2+}/PO_4^{3-}$ 비 2 mol/mol 이상, 교반 시간 10분 이상, 침전 시간 120분 이상, pH 8.5 이상으로 도출되었다. 위 조건에서의 연속 운전 시 총인 제거율 80%, 인산염 제거율 82% 달성이 가능하였다. 침전물의 원소 조성과 결정 구조는 기존 보고된 스트루바이트와 유사하였다.

MBR 공정에서의 인 제거 특성 (Characteristics of Biological Phosphorus Removal in the MBR)

  • 최희정;이승목
    • 대한환경공학회지
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    • 제29권2호
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    • pp.197-204
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    • 2007
  • 이 연구는 EBPR(enhance biological phosphorus removal)의 혐기조건, 호기/무산소 조건 사이의 상호작용을 알아보고 인의 제거 속도와 인 제거에 미치는 영향인자들을 Batch-test로 조사하였다. 실험결과 무산소단계에서 인의 흡수율은 호기 단계보다 50% 정도 낮았고, 인 방출과 인 흡수의 상관관계는 다른 논문들에 비하여 낮았으며, 계수 b는 높았다. Batch-test의 측정 결과 다른 논문들에 비하여 인 방출과 인 흡수의 상관관계$(R^2=0.557)$는 낮았고 계수b (b=8.4049)는 높았다. 또한, 하수에서 인의 중요한 결합 파트너는 Ca, $Mg^{2+}$, Al, Fe 그리고 $K^+$인데 이 실험 결과 칼륨, 마그네슘 그리고 암모니움은 인과 함께 증감함으로써 인의 방출과 흡수에 밀접한 관계가 있음을 알 수 있었다. 즉, 혐기 단계에서 0.2 mol $K^+Ion$ / mol $PO_4-P$ Ion과 0.21 mol $Mg^{2+}Ion$ / mol $PO_4-P$ ion이 측정되어 인에 대한 칼륨 및 마그네슘의 비율은 1 : 5 정도임을 알 수 있었다.

자기분리가 가능한 지르코늄 자성 흡착제의 합성과 인 흡착 특성 (Synthesis and Phosphorus Adsorption Characteristics of Zirconium Magnetic Adsorbent Having Magnetic Separation Capability)

  • 임대석;김은형;김동락;이태구;임학상
    • 상하수도학회지
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    • 제26권3호
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    • pp.431-442
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    • 2012
  • The purpose of this study, is to separate magnetic separation devices using permanent magnets by using magnetization characteristics remaining in treated water after adsorption and synthesizing phosphorus adsorbent capable of magnetic separation for efficient removal of phosphorus. The synthesis of the adsorbent which set Zirconium(Zr) having high friendly features for phosphorus as an element, and by synthesizing Iron Oxide($Fe_3O_4$, another name of $Fe_3O_4$ is magnetite) being able to grant magnetism to Zirconium Sulfate($Zr(SO_4)_2$), zirconium magnetic adsorbent(ZM) were manufactured. In order to consider the phosphorus adsorption characteristics of adsorbent ZM, batch adsorption experiment was performed, and based on the results, pH effect, adsorption isotherm, adsorption kinetics, and magnetic separation have been explore. As the experiment result, adsorbent ZM showed a tendency that the adsorption number was decreased rapidly at pH 13; however, it was showed a high amount of phosphorus removal in other range and it showed the highest amount of phosphorus removal in pH 6 of neutral range. In addtion, the Langmuir adsorption isotherm model is matched well, and D-R adsorption isotherm model is ranged 14.43kJ/mol indicating ion exchange mechanism. The result shown adsorption kinetics match well to the Pseudo-second-order kinetic model. The adsorbent ZM's capablility of regenerating NaOH and $H_2SO_4$, was high selectivity on the phosphorus without impacts on the other anions. The results of applying the treated water after adsorption of phosphorus to the magnetic separation device by using permanent magnets, shows that capture of the adsorbent by the magnetization filter was perfect. And they show the possibility of utilization on the phosphorus removal in water.