• Environmental Engineering Research
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• 제19권4호
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• pp.381-385
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• 2014

Microwave (MW) radiation was developed to remove and recover ammonia nitrogen in the real swine wastewater. The effect of operating parameters of MW radiation such as initial pH, power, radiation time, aeration, and stirring for removal ammonia nitrogen in swine wastewater was determined. The pH, radiation time, and power were significantly influenced on the removal of ammonia nitrogen, and aeration and stirring showed relatively minor effect on the removal of ammonia nitrogen. Optimum condition was achieved to retrieve the nitrogen efficiently at pH 11, 700 W for 5 min in MW radiation process. Through this process, 83.1% of ammonia nitrogen concentration was reduced in swine wastewater and also 82.6% of ammonia nitrogen was recovered as ammonium sulfate at the optimized condition. The high ammonia removal and recovery efficiency of the MW radiation method indicated that MW radiation was an effective technique to remove and recover ammonia nitrogen in the swine wastewater.

• 한국연초학회지
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• 제1권2호
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• pp.120-126
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• 1979

목포, 남원, 예산지방에서 각각 재배한 Burley 엽중의 nitroate form nitrogen, alkaloid form nitrogen, ammonia form nitrogen, protein form nitrogen과 form nitrogen의 함량을 조사하였다. Total nitrogen 중에서 protein form nitrogen이 차지하는 비율이 30-33%로써 가장 높았고, nitrate form nitrogen이 10∼23%, alkaloid form nitrogen이 8∼16%, ammonia form nitrogen이 6∼9%, 그리고 amide form nitrogen이 2∼2%였다. Nitrate form nitrogen의 함량 비율은 예산, 남원, 목포 순으로 증가하는데 반하여 alkaloid form nitrogen은 반대되는 현상을 보였다. 등급에 따라서는 alkaloid form nitrogen과 ammonia form nitrogen의 함량 비율의 순위는 H5>3>L1>3>5이였으며 nitrate form nitrogen은 이와 반대되는 경향이었다.

• Environmental Engineering Research
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• 제25권4호
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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.

• 웰빙융합연구
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• 제6권3호
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• pp.33-36
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• 2023

Purpose: Since the food wastewater contains a high concentration of nitrogen, it is very important to find a way to efficiently remove it. Research design, data and methodology: A total of four experiments were conducted under different conditions to remove ammonia nitrogen present in the food wastewater. The experiment was designed by adding sodium hypochlorite to the raw food wastewater and varying conditions such as pH control, aeration/precipitation, and stirring. Results: The ammonia nitrogen removal rate in Experiment 1 was about 12% (sodium hypochlorite added), ammonia nitrogen increased about 4.7% in Experiment 2 (sodium hypochlorite added after aeration/precipitation in a bioreaction tank, stirring), and decreased about 52.5% (sodium hypochlorite added after controlling and stirring). Conclusions: When the concentration of sodium hypochlorite was high, ammonia nitrogen was best removed, and the pH was adjusted to 12, and sodium hypochlorite was added after stirring, and the removal was the second best. If the method of this study is further studied and developed, it can be basic data for ammonia nitrogen removal in the future.

• 대한환경공학회지
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• 제29권4호
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• pp.460-465
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• 2007

본 연구에서는 고농도 암모니아성질소로 오염된 고체배지로부터 분리해 낸 Leclercia adecarboxylata를 이용하여 암모니아성질소의 제거특성 및 기작을 파악하여 폐수처리의 적용가능성에 대해 살펴보았다. 질소제거에 있어서 가장 널리 알려진 생물학적 질산화와 후탈질에 의한 질소의 대기로의 방출이 아닌 질소합성균주를 이용한 질소의 체내합성을 이용한 영양물질의 제거 가능성에 대해 접근해 보았다. L. adecarboxylata는 무염분조건에서 암모니아성질소의 제거와 균체중식이 가장 왕성했으나, 염분이 4%를 넘어서게 되면 그 효율은 급격히 저하되었다. 약 80 mg/L의 암모니아성질소는 20시간 이내에 거의 대부분 제거되었으나, 500 mg/L인 시료는 탄소원의 부족으로 인해 50시간 이상 처리후에도 50%의 제거율에도 미치지 못해 탄소원이 많을수록 질소제거율은 높음을 알 수 있었다. 탄소원이 모두 소모되고 난 이후에는 더 이상 질소제거는 이루어지지 않았으나, 탄소원을 추가로 공급했을 때 제거효율은 다시 증가했다. 시료의 pH는 미생물의 증식에 의해 8에서 6.36까지 감소했다. 암모니아성질소가 제거되는 동안 아질산성질소와 질산성질소의 축적은 일어나지 않았고, TKN값은 큰 차이를 보이지 않은 것으로 미루어 볼 때 유기질소로의 합성을 추측할 수 있었다. 유기질소 중 단백질의 농도를 측정해 본 결과 초기시료에서는 불검출 되었으나, 48시간 경과후의 시료에는 193.1 mg/L의 단백질이 검출 되었다. 따라서 L. adecarboxylata는 암모니아성질소를 유기질소로 합성하는 능력이 탁월하여 폐수중의 암모니아성질소의 제거에 이용가치가 클 것으로 판단된다.

• KSBB Journal
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• 제16권3호
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• pp.314-319
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• 2001

A nitrifier consortium immobilized in polyvinyl alcohol was used to remove ammonia nitrogen from synthetic wastewater in an airlift bioreactor. The minimum aeration rates were 0.4, 0.6, 0.8 and 1.0 vvm for 5, 10, 15 and 20% immobilized bead packing volume fraction, respectively. The efficient packing fraction and the aeration rate for ammonia nitrogen removal were 15% and 2.4 vvm, respectively. With a hydraulic retention time of 0.5hr, the removal rate and the efficiency of ammonia nitrogen removal were 1685 g/㎥$.$day and 48% at an influent ammonia nitrogen concentration of 75 g/㎥.

• 한국환경과학회지
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• 제8권4호
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• pp.479-483
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• 1999

Nitrifier consortium immobilized in polyvinyl alcohol was used for the removal of ammonia nitrogen from synthetic aquaculture water in the airlift bioreactor. At the aeration rate fo 0.15 vvm and bead packing volume fraction of 20%, airlift bioreactor was operated effectively for a removal of ammonia nitrogen and for a stability of operation. Ammonia nitrogen removal rate by airlift bioreactor was continuously increased with decreasing hydraulic residence time. At the HRT(hydraulic residence time) of 0.3 hour, ammonia nitrogen removal rate was 84.3 g/$m^3$.d and the highest ammonia nitrogen removal rate was 130.8 g/$m^3$.d when HRT was 0.1 hour.

• 한국물환경학회지
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• 제23권6호
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• pp.993-997
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• 2007

The upflow anaerobic sludge blanket (UASB) reactor can be effective for treating simple organic compounds containing high concentration of ammonia nitrogen. The chemical oxygen demand (COD) removal efficiency was about 80% at ammonia nitrogen concentration up to 6,000 mg-N/L. This result also showed that it would be possible to treat propionate effectively at free ammonia nitrogen concentration up to 724 mg-N/L if sufficient time was allowed for adaptation. However the specific methanogenic activity (SMA) of granule was lower than that of granule in the reactor with lower ammonia nitrogen concentration. At 8,000 mg-N/L, the inhibition of high ammonia concentration was observed with evidence of increase of the volatile suspended solids (VSS) concentration in the effluent. It might be ascribed to the decrease in the content of extracellular polymer (ECP), which resulted to the sloughing off of obligated proton-reducing acetogens and heterogenotrophic methanogens from the exterior of granular sludge. This caused a great portion of the finely sludge to be easily washed out. Therefore, failure to maintain the balance between these two groups of microorganism cause accumulation of the hydrogen partial pressure in the reactor, which could have inhibited the growth of acetate utilizing methanogens.

• 상하수도학회지
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• 제21권3호
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• pp.295-303
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• 2007

Nitrogen compounds in municipal wastewater can be divided into biodegradable and nonbiodegradable fractions with biodegradability. Biodegradable nitrogen compounds can be removed through biological nitrification and denitrification processes, and nonbiodegradable nitrogen compounds affect the effluent quality of biological nutrient removal processes. The amount of nitrifiable nitrogen compounds, which are the sum of ammonia and biodegradable organic nitrogen, has been estimated by respirometry. Respirometry shows good estimation of the concentration of nitrifiable nitrogen when a synthetic sample of ammonium chloride is dosed. The estimated concentration of nitrifiable nitrogen compounds in municipal wastewater is close to ammonia concentration in municipal wastewater, but it is lower than that for the synthetic sample. If nitrogen assimilated into cell synthesis of nitrifiers and heterotrophs is considered, the total amounts of nitrifiable nitrogen compounds, which are nitrified and assimilated, could be more accurately estimated. The concentration of nitrifiable nitrogen compounds, which are biodegradable, is about 31 mg N/l, and this is 119% of ammonia and 94% of total nitrogen. Ammonia, nitrate, biodegradable organic nitrogen, and nonbiodegradable nitrogen are about 79%, 1%, 15%, and 5% of the total nitrogen in municipal wastewater, respectively.

• 청정기술
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• 제17권4호
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• pp.363-369
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• 2011

고농도의 암모니아성질소를 함유하는 폐수의 처리에 전기투석공정의 적용성이 실험적으로 평가되었다. 처리 성능은 전기투석공정의 운전인자 중 유입농도, 운전전압, 그리고 유속이 암모니아성질소의 제거효율에 미치는 영향으로 측정되었다. 한계전류밀도는 유입농도와 유입유속이 증가함에 따라 선형적으로 증가하였고, 유입농도에 따라 목표농도에 도달하는 시간은 직선적인 비례관계를 보였다. 상대적으로 큰 암모니아성질소의 이온당량전도도와 이온이동도로 인하여 유입유속의 증가는 제거속도를 지속적으로 증가시켰다. 또한 운전전압의 증가에 따라 제거속도는 증가하였다. 본 연구에 사용된 전기투석모듈에서 고농도의 암모니아성질소를 제거하는 운전조건으로 유입유속은 3.2 L/min, 운전전압은 한계전류밀도에 해당하는 전압의 80~90%가 추천된다.