• Title/Summary/Keyword: Nitrogen and phosphorus removal

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Simultaneous Nitrification and Denitrification by Anaerobic-Aerobic Biological Packed Bed Process

  • Lee, Min-Gye;Ju, Chang-Sik;Lee, Byung-Hyun;Kim, Jung-Kyun;Tadashi Hano
    • Journal of Life Science
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    • v.9 no.2
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    • pp.40-43
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    • 1999
  • In the wastewater treatment experiment by anaerobic-aerobic packed bed unit, it was found that the high and stable removal efficiency of nitrogen could be obtained. The extent of nitrogen removal gradually decreased with the rise of recycle ratio and DO concentration. On the other hand, the extent of phosphorus increased with the increase of DO concentration. COD showed high removal efficiency over the entire range tested. The simulation of T-N behavior was carried out satisfactorily by using the kinetic equations for biofilm and the reactor model which considered the packed bed as a plug flow reactor.

Nitrification of low concentration ammonia nitrogen using zeolite biological aerated filter (ZBAF)

  • Kim, Jin-Su;Lee, Ji-Young;Choi, Seung-Kyu;Zhu, Qian;Lee, Sang-Ill
    • Environmental Engineering Research
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    • v.25 no.4
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    • pp.554-560
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    • 2020
  • This study focuses on nitrification through a biological aerated filter (BAF) that is filled with a zeolite medium at low concentrations of ammonia. The zeolite medium consists of natural zeolite powder. The BAF is operated under two types of media, which are a ball-type zeolite medium and expanded poly propylene (EPP) medium. Nitrification occurred in the zeolite BAF (ZBAF) when the influent concentration of ammonia nitrogen was 3 mg L-1, but the BAF that was filled with an EPP medium did not experience nitrification. The ammonia nitrogen removal efficiency of ZBAF was 63.38% and the average nitrate nitrogen concentration was 1.746 mg/L. The ZBAF was tested again after a comparison experiment to treat pond water, and municipal wastewater mixed pond water. The ZBAF showed remarkable ammonia-nitrogen treatment at low concentration and low temperature. During this period, the average ammonia nitrogen removal efficiency was 64.56%. Especially, when water temperature decreased to 4.7℃, ammonia nitrogen removal efficiency remained 79%. On the other hand, the chemical-oxygen demand (COD) and phosphorus-removal trends were different. The COD and phosphorus did not show as efficient treatment as the ammonia-nitrogen treatment.

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

  • Park Young-Seek;Woo Hyung-Taek;Kim Dong-Seog
    • Journal of Environmental Health Sciences
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    • v.31 no.4 s.85
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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.

Simultaneous Removal of Nitrogen and Phosphorus by Rotating Biological Activated Carbon Process (회전생물활성탄[RBAC] 공정을 이용한 질소.인의 동시 제거)

  • Nam, Beom-Sik;Lee, Yeong-Ho;Jo, Mu-Hwan
    • KSBB Journal
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    • v.14 no.5
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    • pp.606-610
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    • 1999
  • The purpose of this study was to develop and evaluate rotating biological activated carbon(RBAC) process for nitrogen and phosphorus removal with increasing loading rate. The removal efficiency of $NH_4^+$-N was observed to be higher than 96.5% at all runs, and the relative stable levels of effluent $NH_4^+$-N, $NO_2^-$-N, $NO_3^-$-N could be maintained. The removal efficiency of T-N was observed to be higher than 90%, except RUN 1. The T-P removal efficiency was kept between 32.7% and 49.8%, and the amount of biomass was kept between 269 mg/g support and 473 mg/g support with varying loading rate.

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A Study on the Removal of Nitrogen and Phosphorus Depending on Existence of Cilia Media in Sewage in Anaerobic-Anoxic-Oxic Process ($A_2O$공정에서의 섬모상 담체 사용 유무에 따른 하수의 질소 . 인 제거에 관한 연구)

  • 박태진;이정민;송경석;조일형;김영규;정문호
    • Journal of Environmental Health Sciences
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    • v.26 no.3
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    • pp.69-75
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    • 2000
  • This study was carried out to investigate the removal of nitrogen and phosphorus in municipal sewage according to the variation of volumetric ratio in the reactor. It also was performed to provide basic data necessary to the development and improvement of the process which is Anaerobic-Anoxic-Oxic(A2O). In the removal of BOD and COD, the best efficiency of the process showed in the condition of using the media, 1Q of internal recycle rate and 1:3:2 of the volumetric ratio in Anaerobic-Anoxic-Oxic process. In most cases, nitrogen and phosphorus removal efficiency of the process using the cilia media was superior to that of the process which didn't use the media. In the removal of T-N and T-P, the best efficiency of the process showed in the condition of using the media, 1Q of internal recycle rate and 1:3:2 of the volumetric ratio in Anaerobic-Anoxic-Oxic process.

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Nitrogen and Phosphorus Removal of Municipal Wastewater with Temperature in CNR Process (섬모상담체를 이용한 혐기, 무산소, 호기공정(CNR공법)의 온도변화에 따른 하수의 질소, 인의 제거특성)

  • 김영규;양익배;김인배;이영준
    • Journal of Environmental Health Sciences
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    • v.27 no.1
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    • pp.112-118
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    • 2001
  • The aim of this study was to evaluate on the removal effect of total nitrogen and phosphorus in municipal wastewater with temperature change from 1$0^{\circ}C$ to 24$^{\circ}C$ in CNR(Cilia Nutrient Removal) process. CNR process is the process combining $A^2$/O process with cilium media of H2L company. The removal efficiencies for T-N were found to be 57.9% at 1$0^{\circ}C$ below, 53.7% at 10-2$0^{\circ}C$, 52.2%at 20-24$^{\circ}C$ and 44.4% over 24$^{\circ}C$ respectively. The removal efficiencies for T-P were 53.3% at 1$0^{\circ}C$ below, 59.1% at 10-2$0^{\circ}C$, 72.4% at 20-24$^{\circ}C$ and 50.0% over 24$^{\circ}C$ respectively. The specific nitrification rate (kg NH$_3$-N/kg MLSS.d) of Oxic basin was 0.088 and 0.053 at 1$0^{\circ}C$ below, 0.077 at 10-2$0^{\circ}C$, 0.097 at 20-24$^{\circ}C$ and 0.088 over 24$^{\circ}C$ respectively. The specific denitrification rate (kg NH$_3$-N/kg MLSS.d) in anaerobic and anoxic was 0.013, 0.008 respectively.

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Nitrogen and Phosphorus Removal from Domestic Wastewater by MLE Process Combined with Aluminum Corrosion Process (알루미늄 부식 반응조를 조합한 MLE공정에서 하수의 질소와 인 제거)

  • Park, Sang-Ill;Choi, Hyung-Il;Cheong, Kyung-Hoon;Park, De-Hoon
    • Journal of Environmental Science International
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    • v.22 no.11
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    • pp.1383-1388
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    • 2013
  • The pilot plant experiment was performed to investigate phosphorus and nitrogen removal from domestic wastewater by MLE process combined with aluminum corrosion reactor. When operating 0.5Q and 1Q to internal recycle and sludge recycle in the MLE process, the effluent $COD_{Mn}$ concentration of internal recycle 0.5Q were higher than internal recycle 1Q, the removal efficiency rates of $NH_3$-N in the internal recycle 0.5Q were was higher than internal recycle 1Q. Denitrification rates were about 86.8% in internal recycle and sludge recycle 0.5Q. When operating 0.5Q to internal recycle and sludge recycle in the MLE process, the removal efficiency rates of total nitrogen was the highest. The removal efficiency rates of total phosphorus was about 91.5% in the aluminum corrosion reactor.

Study on the Removal Efficiency of Nitrogen and Phosphorus in Wastewater Treatment System Using Magnetite Powder (자철광 분말을 이용한 하수처리시스템의 질소, 인 제거효율에 관한 연구)

  • Jo, Eun-Young;Park, Seung-Min;Yeo, In-Seol;Moon, Joeng-Sik;Park, Ju-Young;Kim, Jong-Cheol;Kim, Yang-Seob;Park, Chan-Gyu
    • The KSFM Journal of Fluid Machinery
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    • v.18 no.2
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    • pp.43-47
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    • 2015
  • As water quality regulations have tightened, many studies to improve wastewater treatment efficiency have been performed. In this study, magnetite powder was used to maintain a high concentration of MLSS in lab-scale wastewater treatment system. After magnetite powder injection, MLSS concentration was above 8,000 mg/L and it was 3.2 times higher than control group(2,500 mg/L). In addition, nitrogen removal efficiency and phosphorus removal efficiency comparing with the control group was increased 20.5% and 11%, respectively.

The Processing of Livestock Waste Through the Use of Activated Sludge - Treatment with Intermittent Aeration Process -

  • Osada, T.
    • Asian-Australasian Journal of Animal Sciences
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    • v.13 no.5
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    • pp.698-701
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    • 2000
  • To prevent surface and underground water pollution, wastewater treatment is essential. Four bench-scale activated sludge units (10 L operational volumes) were operated at 5, 10 and $20^{\circ}C$ for evaluation of treatment efficiencies with typical wastewater from swine housing. The units were set for a 24-hour cycle. As compared to the conventional process, high removal efficiencies for organic substances, nitrogen and phosphorus in swine wastewater were obtained simultaneously with an intermittent aeration process (lAP). The NOx-N produced during an aeration period was immediately reduced to nitrogen gas (e.g. $N_2$ or $N_2O$) in the subsequent non-aeration periods, and nitrification in aeration periods occurred smoothly. Under these conditions, phosphorus removal occurred with the release of phosphorus during the non-aeration periods followed by the excess uptake of phosphorus in the activated sludge during aeration periods. It was confirmed that the lAP had a better ability to remove pollutants under both low temperatures and high nitrogen loading conditions than the ordinary method did. In addition to that, the total emission of $N_2O$ from lAP was reduced to approximately 1/50 of the conventional process for the same loading. By adopting an adequate aeration programme for individual swine wastewater treatment, this system will provide a promising means for nitrogen and phosphorus control without pH control or addition of methanol.

Relationship Between C/N Ratio and Nitrogen Removal in Intermittently Aerated Activated Sludge System (간헐폭기 활성슬러지공정에서 C/N비와 질소제거의 관계)

  • 서인석;김병군;이상일
    • Journal of environmental and Sanitary engineering
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    • v.13 no.2
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    • pp.57-65
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    • 1998
  • In this research, Effect of C/N ratio on nutrient removal in intermittently aerated activated sludge system(IAASS) was investigated with dormitary, building and swine wastewater. Three types (2-stage, 4-stage, modified) of IAASS were operated. Time interval of aeration/nonaeration in IAASS was 1hr/1hr. In treatment of Dormitary wastewater(BOD/T-N ratio : 4.4), Building wastewater (BOD/T-N ratio : 3.14) and swine wastewater(BOD/T-N ratio : 3.84), Nitrogen removal efficiency of 80, 70 and 90.4% was achieved, respectively. Nitrogen removal in IAASS was a great influenced on influent C/N ratio, efficient nitrogen removal was achieved at BOD/T-N ratio over 4. In IAASS operation, $\Delta $BOD mg/L/$\Delta $ nitrogen mg/L ratio was about 4-6. Simultaneous removal of organic, nitrogen and phosphorus in IAASS can achieved. And influent organic was efficiently utilized in denitrification. IAASS could be one of the best alternative process for the retrofit of conventional activated sludge system for the removal of nutrients.

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