• Title/Summary/Keyword: phosphorus release

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A Study on the Removal of Nitrogen and Phosphorus of Municipal Wastewater with Biological Coated Media (미생물 코팅 담체를 이용한 하수의 질소$\cdot$인 제거에 관한 연구)

  • Kim Young-Gyu;Cho Il-Hyoung
    • Journal of Environmental Health Sciences
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    • v.32 no.1 s.88
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    • pp.27-35
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    • 2006
  • This study was carried out to investigate the removal of nitrogen and phosphorus in municipal sewage depending on existence of biological coated media in BCM reactor. The reactor with biological coated media is the process combining $A_2/O$ process. The removal efficiencies for $COD_{Mn},\; BOD_5,\;SS$, T-N and T-P were $78\%,\;90.5\%,\;92.3\%,\;61.9\%,\;60.2\%$, respectively. The specific nitrification rate$(mgNO_3-N/gMLSS{\cdot}d)$ of Contact aeration basin was 52.2 and the specific denitrification rate$(mgNO_3N/gMLSS{\cdot}d)$ in anoxic basin was 95.1. Also, phosphorus release$(mgPO_4-P/gMLSS{\cdot}d)$ in Anaerobic basin was 71.8 and Phosphorus uptake$(mgPO_4-P/gMLSS{\cdot}d)$ in contact aeration was 27.1.

Isolation and Characterization of Phosphorus Accumulating Acinetobacter CW3 (인 축적균 Acinetobacter CW3의 분리 및 특성)

  • 심성훈;류원률;이영호;김정목;조무환
    • KSBB Journal
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    • v.14 no.1
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    • pp.71-75
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    • 1999
  • A highly effective phosphorus accumulating bacterium named Acinetobacter CW3 was isolated from the nature by using Winogradsky columns. The optimal cultivation conditions of Acinetobacter CW3 in shaking flask were determined as $20^{\circ}C$, pH 7, 200rpm, 18.5mg $PO_4$-P/L. Acientobacter CW3 could remove phosphorus completely in 12hours for a batch culture at optimal cultivation condition. This bacterium could uptake phosphorus on aerobic condition and release it on anaerobic condition.

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Possibility of Anoxic Phosphorus Removal by Denitrifier in Denitrifying EBPR System (생물학적 질소.인 동시제거 시스템에서 탈질미생물의 인 제거 가능성)

  • Lee, Hansaem;Yun, Zuwhan
    • Journal of Korean Society on Water Environment
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    • v.29 no.6
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    • pp.782-789
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    • 2013
  • Enhanced biological phosphorus removal (EBPR) behavior and microbial characteristics in the anaerobic-aerobic SBR (PAO SBR) and the anaerobic-anoxic SBR (DPAO SBR) were examined in this research. For 392 days of operation, both SBRs have exhibited a good EBPR (or denitrifying EBPR) performance. $P_{release}/P_{influent}$ ratio was highest in both reactors after the stabilization, while the efficiency of phosphorus removal was decreased since the sludge granulation has been visually observed within the reactor. The comparative analysis of Pyrosequencing-based microbial population between PAO and DPAO sludges showed indirectly that Dechloromonas spp. could utilize $O_2$ and $NO_3{^-}-N$ as an electron acceptor and Accumulibacter phosphatis use only $O_2$ in EBPR system. Also, we concluded that Thauera spp. as a denitrifier contribute significantly to the anoxic phosphorus removal in the DPAO system.

Pollutants Release from Sediments in Estuarine Reservoir (간척담수호 저층퇴적물의 오염물질 용출특성)

  • Jung, Kwang Wook;Yoon, Chun Gyeong;Lee, In Ho;Lee, Seung Il;Kang, Su Man;Ham, Jong Hwa
    • Journal of The Korean Society of Agricultural Engineers
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    • v.56 no.1
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    • pp.1-9
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    • 2014
  • Sediment pollutants have been considered an important source for the eutrophication of estuarine reservoir. In this study, the effects of pollutants released from bottom sediment to water column were investigated. Sediment samples were collected each two station from Namyang and Sukmoon estuarine reservoirs in August 2013. The fractionation result of sediment phosphorus indicated that Adsorbed-P ($36.7{\pm}8.84%$) and Nonapatite-P ($29.3{\pm}12.50%$) are the two dominant phosphorus groups in the sediments. For sediment release test, eight sets of acrylic chamber (0.3 m $diameter{\times}1m$ high, with 0.15 m sediment depth) were used with aerobic and anaerobic environment. Under anaerobic conditions, rates of $NH_4-N$ release from the sediments were highly variable, with final concentrations of $NH_4-N$ in the overlying water varying from between about 0.69~1.04 in Namyang and 2.58~4.23 mg/L in Sukmoon reservoir. The $NH_4-N$ release was active at the upstream around the confluence of tributary compared to downstream near the embankment. The $PO_4-P$ release was more obvious than $NH_4-N$ in anaerobic condition. The final $PO_4-P$ concentrations were approximately from two-fold to eight-fold higher than initial concentration. In terms of reservoir water quality management, not only tributary pollutants but also sediment nutrient loading is necessary to consider the water quality contribution.

Laboratory Study of Phosphorus Fractionation in the Sediments of Yeongsan River (영산강 퇴적물 인의 존재형태에 대한 실험실 연구)

  • Oh, Hae Seong;Huh, In Ae;Choi, Jung Hyun
    • Journal of Korean Society of Environmental Engineers
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    • v.39 no.9
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    • pp.519-526
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    • 2017
  • This study investigated the effect of phosphorus fractionation on the phosphorus release from the sediments of Juksan reservoir in Yeongsan River. The field sediments were collected, incubated, and analyzed with respect to phosphorus fractionation of sediments and total phosphorus (TP) of overlying water after 7 days. The total amount of inorganic phosphorus of YS2 site was higher than YS1 site. Al-P and Fe-P were major constituents of inorganic phosphorus. During the incubation, Al-P, Fe-P and Ca-P were increased and Red-P was decreased at both sites. YS1 site showed increased TP concentration of overlying water, however, YS2 had opposite trend during the incubation. Counting on the particle size distribution of YS1 and YS2, particle size distribution is major factor to control the TP concentration of overlying water. There were positive relationship between Fe-P and TP and negative relationship between Red-P. From the results, it is essential to continuously monitor the sediment phosphorus fraction in order to control the TP concentration of the water.

The Effects of Visible Light on Iron Release from Ferritin Related to Lipid Peroxidation in the Retina

  • Ohishi, Kentaro;Hiramitsu, Tadahisa;Matsugo, Seiichi
    • Journal of Photoscience
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    • v.9 no.2
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    • pp.427-429
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    • 2002
  • We studied iron release from ferritin by irradiating the visible light, and then followed ferritin-mediated lipid peroxidation in the rod outer segment (ROS) fraction of the porcine retina. In the presence of several phosphorus compounds such as ADP and ATP, iron release from ferritin at pH 7.0 could be induced by irradiation of the visible light to the reaction mixtures. Furthermore, iron release from ferritin in the presence of ADP depended on the incubation time and the visible light irradiation. Moreover, we investigated lipid peroxidation level in the ROS fraction by two independent assay systems including the thiobarbituric acid (TBA) and ferrous oxidation/xylenol orange (FOX) methods. The visible light induced ferritin-mediated lipid peroxidation in the ROS fraction in time- and irradiance-dependent manners. In the dark condition, iron release and lipid peroxidation were not observed. Iron release from ferritin by irradiating the visible light may play an important role in the etiology of phototoxic injuries in vivo.

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The Effect of Temperature with Substrate and Sludge Adaptation on Biological Phosphorus Release (생물학적 인 방출시 유기물 및 슬러지 적응에 따른 온도의 영향)

  • Min, Kyung-Kook;Weon, Seung-Yeon;Park, Seung-Kook;Lee, Sang-Ill
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.7
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    • pp.1205-1212
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    • 2000
  • The effect of temperature on the sources of organic acids and sludge when phosphorus was biologically released was evaluated in this study. The sludge used in this study was obtained from sequencing batch reactor processing the swine wastewater. Temperature is one of the most important parameters influencing the phosphorus release. As a result, the rate of phosphorus released was increased as the temperatures were increased from 5 to $30^{\circ}C$ regardless of the sources of organic acids used. Under anaerobic conditions, as acetate, propionate, glucose, and domestic wastewater were used as the sources of organic acids, the corresponding activation energy($E_a$) values were 49.83, 55.82, 54.61, and 45.44 KJ/mol, respectively. Temperature coefficient($\theta$) values were 1.0676, 1.0826, 1.0748, and 1.0698, respectively. Therefore, the rate of phosphorus released was increased as temperature was increased, whereas, the effect, of the sources of organic acids and temperature on the activation energy and temperature coefficient values were minimal. When the sludge previously adapted to acetate as external organic source was used, the activation energy and temperature coefficient values were 44.94 KJ/mol and 1.0570 respectively. The effect of temperature was minimal. These values obtained from the sludge previously adapted to acetate were smaller than those from the sludge not previously adapted to the same organic acid. This suggest that the sludge previously adapted to acetate was less dependent on temperature than that not adapted to the acetate.

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A Study on the Biological Organic, Nitrogen and Phosphorus Removal in Sequencing Batch Biofilm Reactor (연속회분식 생물막 반응기(Sequencing Batch Biofilm Reactor)를 이용한 수중의 유기물, 질소 및 인의 동시 제거에 관한 연구)

  • 박민정;김동석
    • Journal of Environmental Health Sciences
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    • v.30 no.2
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    • pp.84-91
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    • 2004
  • Biological nutrient removal(BNR) from wastewater was performed by adopting various process configurations. The simultaneous biological organics, phosphorus and nitrogen removal of synthetic wastewater was investigated in a sequencing batch biofilm reactor (SBBR). The other reactor was operating as a reference, without biofilm being added. The cycling time in SBR and SBBR was adjusted at 12 hours and then certainly included anaerobic and aerobic conditions. Both systems has been operated with a stable total organic carbon(TOC), nitrogen and phosphorus removal performance for over 90 days. Average removal efficiencies of TOC and total nitrogen were 83% and 95%, respectively. The nitrification rate in SBR was higher than that in SBBR. On the contrary, the denitrification rate in SBBR was higher than that in SBR. The phosphorus release was occurred in SBBR, however, not in SBR because of the inhibition effect of NO$_3$$^{[-10]}$ .

Release of Nutrients from Different Wasted Activated Sludges by Microwave Heating (다양한 활성 슬러지 공정에서 얻은 잉여 슬러지의 마이크로웨이브 가온과 영양물질의 방출)

  • Yang, Hoiweon;Ahn, Johwan;Kim, Jangho;Kim, Junghwan
    • Journal of Korea Society of Waste Management
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    • v.35 no.8
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    • pp.701-708
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    • 2018
  • Chemical batch tests were conducted to investigate the amount of nutrients that were released from the wasted activated sludge during microwave heating. For this study, three types of activated sludge were obtained from $A_2/O$, MLE and oxidation ditch (OD) processes. Polyphosphate-accumulating organisms in the activated sludge have a unique trait: they releases phosphate from the cell when they are exposed to high temperatures. The sludge obtained from the $A_2/O$ process released the largest amount of phosphate, followed by those from the MLE and OD processes. The release of phosphate increased with increasing polyphosphate content in the sludge under strongly alkaline or acidic conditions. Furthermore, ammonia and heavy metals were released with phosphorous. The largest amount of ammonia was observed from the sludge obtained from the MLE process. The release of heavy metals strongly depends on the pH conditions. Therefore, the chemical analysis results strongly suggest that both phosphorus and ammonia react with $Mg^{2+}$ or $Ca^{2+}$ to form metal complexes such as magnesium ammonium phosphate or hydroxyapatite under alkaline conditions.

Performance of carbon nanotube-coated steel slag for high concentrations of phosphorus from pig manure

  • Kang, Kyeong Hwan;Kim, Junghyeon;Jeon, Hyeonjin;Kim, Kyoungwoo;Byun, Imgyu
    • Membrane and Water Treatment
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    • v.11 no.1
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    • pp.59-68
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    • 2020
  • The study objective was to evaluate the enhanced removal of high concentrations of phosphorus from synthetic wastewater (solely phosphorus-containing) and real wastewater (pig manure) by using carbon nanotube (CNT)-coated steel slag. Generally, phosphorus removal by steel slag is attributed to Ca2+ eluted from the slag. However, in this study, CNT was used to control the excess release of Ca2+ from steel slag and increase the phosphorus removal. The phosphorus removal rate by the uncoated steel slag was lower than that of the CNT-coated steel slag, even though the Ca2+ concentrations were higher in the solution containing the uncoated steel slag. Therefore, the phosphorus removal could be attributed to both precipitation with Ca2+ eluted from steel slag in aqueous solution and adsorption onto the surface of the CNT-coated steel slag. Furthermore, the protons released from the CNT surface by exchanging with divalent cations acted to reduce the pH increase of the solution, which is attributed to the OH- eluted from the steel slag. The adsorption isotherm and kinetics of the CNT-coated steel slags followed the Freundlich isotherm and pseudo-second-order model, respectively. The maximum adsorption capacity of the uncoated and CNT-coated steel slags was 6.127 and 9.268 mg P g-1 slag, respectively. In addition, phosphorus from pig manure was more effectively removed by the CNT-coated steel slag than by the uncoated slag. Over 24 hours, the PO4-P removal in pig manure was 12.3% higher by the CNT-coated slag. This CNT-coated steel slag can be used to remove both phosphorus and metals and has potential applications in high phosphorus-containing wastewater like pig manure.