• Title/Summary/Keyword: Nitrogen release

Search Result 341, Processing Time 0.042 seconds

A study on the measurement of nutrients release from sediment (영양염 용출 측정에 관한 고찰)

  • 김도희
    • Journal of Environmental Science International
    • /
    • v.11 no.12
    • /
    • pp.1333-1337
    • /
    • 2002
  • A significant fraction of nutrients, such as nitrogen and phosphorus released from sediment are utilized by primary production in the shallow water of coast and lake. The purpose of this study is to introduce the mechanism of nutrients release from sediment and to introduce the methods of the measurement of nutrient released from sediment. One approach is to calculate nutrients released from sediment by a concentration gradient between sediment pore waters and overlying water based on the Fick's law. The other approaches of measurement are the undisturbed sediment core experiments and measurement of nutrient released from sediment by the in situ chamber equipment.

The Nitrogen Behavior and Budget in Lake Paldang (팔당호의 질소거동과 수지)

  • Lee, Jangho;Park, Hae-Kyung;Lee, Kyoo;Kim, Eunmi
    • Journal of Korean Society on Water Environment
    • /
    • v.26 no.1
    • /
    • pp.71-80
    • /
    • 2010
  • We studied the nitrogen behavior and budget of Lake Paldang from March to December 2008. The particulate nitrogen (PN) concentrations ranged from 7 to 13% of the total nitrogen concentration (TN) in the stream inflows, the downstream outflow, and the lake water. The nitrate nitrogen ($NO_3-N$) concentration ranged from 67 to 78% of the TN. In the three rivers of Lake Paldang, Gyeongan River (In3 site) had the highest average of the TN, 5.037 mgN/L, but North Han River (In2 site) had the lowest average TN, 1.683 mgN/L. South Han River (In1 site) had the average TN of 2.399 mgN/L. In the dam discharge, TN showed the average 2.063 mgN/L. In the lake water, L4 site (Gyeongan River area) had the highest average TN, 3.781 mgN/L, but L3 site (North Han River) had the lowest average TN, 1.587 mgN/L. Total input of nitrogen loads to Lake Paldang was about 30,875 ton/year in 2008. Inflow rivers contributed 30,643 ton/year (South Han River: 18,111 ton/year (59%), North Han River: 11,333 ton/year (37%), and Gyeongan River: 1,199 ton/year (4%)). The atmospheric deposition had 135 ton/year, the nitrogen release from the bottom sediments had 88 ton/year, and macrophytes had 9 ton/year. Total output of nitrogen loads from Lake Paldang was about 31,256 ton/year. The downstream from dam contributed 29,877 ton/year, and the sediment deposition was 1,379 ton/year.

Performance Estimation of SBR Aerobic Digestion Combined with Ultrasonication by Numerical Experiment (수치실험을 통한 초음파 결합형 SBR 호기성 소화의 거동 예측)

  • Kim, Sunghong;Kim, Donghan;Lee, Dongwoo
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.27 no.6
    • /
    • pp.815-826
    • /
    • 2013
  • Using a developed mathematical model and calibrated kinetic constants, numerical experiments for a aerobic digestion of wastewater sludge by SBR aerobic digestion process combined with ultrasonication (USSBR) were performed in this study. It simulated well the phenomena of the decomposition of particulate organics and the release of organic nitrogen and transformation. To achieve 40 % of particulate organics removal, USSBR process requires only 6 days of SRT and 14 W/L of ultrasonic power whereas SBR aerobic digestion process requires 12 days of SRT. Based on the model simulation results, an empirical equation was presented here. This equation will be used to predict digestion efficiency for the given variables of SRT and ultrasonic power dose. USSBR aerobic digestion process can reduce the nitrogen concentration. The optimal operation strategy for the simultaneous removal of solids and soluble nitrogen in this process is estimated to 7 days of SRT with 14 W/L of ultrasonic power dose while anoxic period was 6 hours out of 24 hours of cycle time. In this condition, 40 % of particulate organics as well as 36 % of total nitrogen will be removed and the soluble nitrogen concentration of the centrate will be lower less then 40 mg/L.

Management of Excretion of Phosphorus, Nitrogen and Pharmacological Level Minerals to Reduce Environmental Pollution from Animal Production - Review -

  • Paik, I.K.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • v.14 no.3
    • /
    • pp.384-394
    • /
    • 2001
  • In order to prevent pollution from animal waste, P, N and pharmacological level minerals should be properly managed. Microbial phytase has been used successfully to control P excretion. Activity of natural phytase in certain plant feedstuffs is high enough to be considered in feed formulation. Nitrogen control can be achieved through amino acid supplementation and protein restriction in the diet. Supplementation with carbohydrases reduces output of excreta as well as N. Ammonia release from the manure could be reduced by using a low crude protein diet along with the supplementation with probiotics products. Excretion of minerals used at pharmacological level can be reduced by using chelated forms. Cu and Zn in the form of methionine chelate have been successfully used in the broiler and pig diets.

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
    • /
    • v.32 no.1 s.88
    • /
    • pp.27-35
    • /
    • 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.

Nitrogen and Phosphorus Removal Characteristics by the Variation of Aeration Time in SBR (SBR에서 포기기간 변경에 따른 질소.인 제거 특성)

  • Kim, Dong-Seog;Park, Young-Seek
    • Journal of Environmental Health Sciences
    • /
    • v.35 no.2
    • /
    • pp.116-123
    • /
    • 2009
  • Laboratory scale experiments were conducted to investigate the removal characteristics of nitrogen and phosphorus by the variation of aeration time in four sequencing batch reactors (SBRs). In R1 which has the shortest aeration time as 1 h, MLVSS concentration in reactor decreased by the wash-out of biomass because of the poor sedimentation. The TOC removal efficiencies were almost similar in 3 reactors except R1. At the low aeration time as 1 h, the nitrification was severely inhibited by the deficiency of oxygen. ${NH_4}^+$-N removal efficiency was decreased by the decrease of aeration time. At the aeration time over 2 h, the phosphorus removal efficiency was not affected by the variation of aeration time. The nitrification was inhibited but the phosphorus release and uptake was not inhibited by the decrease of low aeration time. Therefore, we can see that the phosphorus removal microorganisms are superior to nitrification microorganisms in oxygen utilization.