High-Concentration Nitrogen Removal by Anaerobic Ammonium Oxidation Process

This experiment aimed to explore the effect of high- concentration nitrogen removal by Anaerobic ammonium oxidation process. The mixed liquor suspended solid(MLSS)was 510 mg/L. In the beginning of the experiment, the inflow concentration rate of ammonia nitrogen and nitrite nitrogen was about 1:1.3 and the total nitrogen concentration was low. When the reactor reached the ideal treatment effect then gradually increased the total nitrogen concentration, until reaching the maximum nitrogen load rate(NLR) of the reactor. In the temperature of 34.4 °C, PH was 7.23, the inflow concentration of ammonia nitrogen was 223.3 mg. N/L, the inflow concentration nitrite nitrogen was 289.7 mg. N/L, the dissolved oxygen (DO) was 2.3 mg. N/L, the nitrogen load rate (NLR) was 6.08 kg. N / (m3. d), the nitrogen removal rate (NRR) was 5.60 kg. N / (m3. d), the total nitrogen (TN) removal rate was 92.2%, under this conditions, the reactor achieved the best effect.

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Combining artificial aeration and biological zeolite mulch for nitrogen removal from eutrophic water bodies

Water Practice & Technology ◽

10.2166/wpt.2020.005 ◽

2020 ◽

Vol 15 (1) ◽

pp. 151-159

Author(s):

Cheng Lu ◽

Wen Cheng ◽

Min Wang ◽

Zhiwei Zhou

Keyword(s):

Total Nitrogen ◽

Nitrogen Removal ◽

Removal Rate ◽

Nitrogen Concentration ◽

Combined Treatment ◽

Ammoniacal Nitrogen ◽

Nitrogen Species ◽

Artificial Aeration ◽

Total Nitrogen Concentration ◽

Eutrophic Water

Abstract Endogenous nitrogen pollution can be a major cause of eutrophication. Nitrogen species release from sediments can be reduced by biologically-enforced zeolite mulch or water column aeration. This study was about their combined effects. Water and surface sediment samples from the Yangzhou ancient canal were aerated and biozeolite mulching was applied separately and in combination for 81 days, while the nitrogen species removal rate was recorded. The combination of aeration and biozeolite mulching removed >95% of the ammoniacal-nitrogen in 15 days. This was better than either the blank control or biozeolite mulch without aeration. The ammoniacal-nitrogen concentration was lowered faster by combined treatment than by aeration alone. Nitrate nitrogen was only detected during aeration between days 10 and18, and reached lower concentration in the presence of biozeolite. Nitrate was formed during aeration but its concentrations were higher and more variable in the absence of biozeolite; that is, mulching stabilized nitrate formation. The total nitrogen concentration reached its lowest levels after 81 days with biozeolite treatment alone, with 78% total nitrogen removal, whereas combined aeration with biozeolite achieved 41%. This shows that biozeolite mulching can remove nitrogen in eutrophic waters, even without aeration.

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Influence of the Initial Nitrogen Concentration on Eliminating Nitrogen Load of Europhia Sediment Capping with Active Barrier System (ABS)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.374-377.498 ◽

2011 ◽

Vol 374-377 ◽

pp. 498-503

Author(s):

Jin Lan Xu ◽

Lei Wang ◽

Jun Chen Kang ◽

Ting Lin Huang ◽

Yu Hua Dong

Keyword(s):

Total Nitrogen ◽

Nitrate Nitrogen ◽

Nitrogen Concentration ◽

Ammonia Nitrogen ◽

Overlying Water ◽

Sediment Capping ◽

Time Treatment ◽

Total Nitrogen Concentration ◽

Long Time ◽

Active Barrier

Abstract: Active barrier system (ABS) capping zeolite with large surface area and strong adsorption ability is an effective way to control eutrophication of lake since it can remove ammonia in the lake released by sediment. Influence of the initial nitrogen concentration on eliminating nitrogen load of europhia sediment capping with active barrier system (ABS) were studied through an investigation of the repairment results of serious pollution period (total nitrogen concentration up to 25.33 mg/L), moderate pollution period (14.39 mg/L) and the slight pollution period (3.47 mg/L) of the ancient Canal of Yangzhou. The results showed that: (1) zeolite F1 inhibition effect is stronger than zeolite F2. More TN were removed as the initial TN concentration increased and longer rapid inhibit period were presented with the increased initial TN concentration. (2) The ammonia nitrogen in sediment could be rapidly released into the overlying water, and with lower initial TN concentration in source water, more ammonia would be released from the sediment. Long time treatment was necessary to inhibit the release of ammonia completely if the water showed a high initial TN concentration. (3) After covering zeolite, the total nitrogen in the overlying water were removed mainly through nitrification and denitrification. At the initial TN concentration of 3.47 mg/L, 14.39 mg/L, 25.88 mg/L, 61%, 45% and 52% of TN were removed by the conversion of ammonia to nitrogen gas, however, others left in water as nitrate nitrogen and nitrite residues, and 90% was nitrate nitrogen.

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Treatment of high-strength rare-earth ammonia wastewater with two-stage anammox process

Global NEST Journal ◽

10.30955/gnj.002048 ◽

2016 ◽

Vol 18 (4) ◽

pp. 867-874 ◽

Cited By ~ 3

Keyword(s):

Rare Earth ◽

Removal Rate ◽

Nitrogen Concentration ◽

High Strength ◽

Nitrogen Loading ◽

Ammonium Oxidation ◽

Two Stage ◽

Uncultured Bacterium ◽

Total Nitrogen Concentration ◽

Anammox Process

In this study, a two-stage anaerobic ammonium oxidation (anammox) system—including a partial nitritation system with a biological selector (PNBS) and a granular activated carbon-based granule anammox process (GAP) —was used for the treatment of real high-strength rare-earth ammonia wastewater (HRAW). A nitrogen removal rate of 89% on average was achieved at the end of the study with the influent total nitrogen concentration of 2200 mg l-1. The nitrogen-loading rate (NLR) of 17 kg N/(m3×d) was achieved in the PNBS, and a reduced NLR of 6 kg N/(m3×d) was maintained in the GAP. To our knowledge, this is the highest NLR applied to a two-stage anammox system. A genetic analysis of the sludge samples revealed that a Nitrosomonas sp. was enriched in the PNBS reactor, while, Kuenenia stuttgartiensis, Uncultured bacterium clone KIST-JJY001, and Uncultured anoxic sludge bacterium KU2 were enriched in the GAP reactor.

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Comparative Study on Advanced Nitrogen Removal of Landfill Leachate Treated by SBR and SBBR

Water ◽

10.3390/w13223240 ◽

2021 ◽

Vol 13 (22) ◽

pp. 3240

Author(s):

Jinfeng Jiang ◽

Liang Ma ◽

Lianjie Hao ◽

Daoji Wu ◽

Kai Wang

Keyword(s):

Total Nitrogen ◽

Nitrogen Removal ◽

Landfill Leachate ◽

Batch Reactor ◽

Nitrogen Concentration ◽

Carbon Sources ◽

Oxygen Demand ◽

Ammonia Nitrogen ◽

Two Systems ◽

Advanced Nitrogen Removal

In order to achieve advanced nitrogen removal from landfill leachate without the addition of external carbon sources, a Sequencing Batch Reactor (SBR) and a Sequencing Biofilm Batch Reactor (SBBR) were proposed for the treatment of actual landfill leachate with ammonia nitrogen (NH4+-N) and chemical oxygen demand (COD) concentrations of 1000 ± 100 mg/L and 4000 ± 100 mg/L, respectively. The operating modes of both systems are anaerobic–aerobic–anoxic. After 110 days of start-up and biomass acclimation, the effluent COD and the total nitrogen (TN) of the two systems were 650 ± 50 mg/L and 20 ± 10 mg/L, respectively. The removal rates of COD and total nitrogen could reach around 85% and above 95%, respectively. Therefore, advanced nitrogen removal was implemented in landfill leachate without adding any carbon sources. After the two systems were acclimated, nitrogen removing cycles of SBR and SBBR were 24 h and 20 h, respectively. The nitrogen removing efficiency of SBBR was improved by 16.7% in comparison to SBR. In the typical cycle of the two groups of reactors, the nitrification time of the system was the same, which was 5.5 h, indicating that although the fiber filler occupied part of the reactor space, it had no significant impact on the nitrification performance of the system. At the end of aeration, the internal carbon source content of sludge of SBBR was equivalent to that of the SBR system. However, the total nitrogen concentration of SBBR was only 129 mg/L, which is 33.8% lower than that of SBR at 195 mg/L. The main reason was that biofilm enhanced the simultaneous nitrification and denitrification (SND) effect of the system.

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Kinetic study on nitrification of ammonium nitrogen-enriched synthetic wastewater using activated sludge

Water Science & Technology ◽

10.2166/wst.2020.080 ◽

2020 ◽

Vol 81 (1) ◽

pp. 62-70

Author(s):

Roumi Bhattacharya ◽

Debabrata Mazumder

Keyword(s):

Activated Sludge ◽

Nitrogen Removal ◽

Suspended Solids ◽

Removal Rate ◽

Nitrogen Concentration ◽

Ammonium Nitrogen ◽

Synthetic Wastewater ◽

Yield Coefficient ◽

Ammonium Oxidation ◽

Consecutive Reaction

Abstract Nitrification of ammonium nitrogen (NH4+-N)-bearing synthetic wastewater was performed in a batch-activated sludge reactor by varying the initial ammonium nitrogen concentration up to 400 mg/L at a pH of 8.1 ± 0.2 and temperature of 36 ± 2 °C for developing the process kinetics using acclimatised biomass. Maximum ammonium nitrogen removal efficiency of 98.3% was achieved with initial ammonium nitrogen and mixed liquor suspended solids concentration of 235 mg/L and 2,180 mg/L, respectively, at 48 h batch period. Based on the experimental results, kinetic constants for ammonia nitrogen removal following Monod's approach were obtained as maximum substrate removal rate coefficient = 0.057 per day, yield coefficient = 0.336 mg volatile suspended solids/mg ammonium nitrogen, half velocity constant = 12.95 mg NH4+-N/L and endogenous decay constant = 0.02 per day. Nitrification is a consecutive reaction with ammonium oxidation as the first step followed by nitrite oxidation. The overall rate of nitrite and nitrate formation was observed to be 1.44 per day and 0.34 per day, respectively.

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Efficient Utilization of Waste Carbon Source for Advanced Nitrogen Removal of Landfill Leachate

BioMed Research International ◽

10.1155/2017/2057035 ◽

2017 ◽

Vol 2017 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Kai Wang ◽

Wenjun Yin ◽

Fengxun Tan ◽

Daoji Wu

Keyword(s):

Carbon Source ◽

Total Nitrogen ◽

Nitrogen Removal ◽

Landfill Leachate ◽

Removal Rate ◽

Batch Reactor ◽

Critical Factor ◽

Ammonia Nitrogen ◽

The Real ◽

Advanced Nitrogen Removal

A modified single sequencing batch reactor (SBR) was developed to remove the nitrogen of the real landfill leachate in this study. To take the full advantage of the SBR, stir phase was added before and after aeration, respectively. The new mechanism in this experiment could improve the removal of nitrogen efficiently by the utilization of carbon source in the raw leachate. This experiment adopts the SBR process to dispose of the real leachate, in which the COD and ammonia nitrogen concentrations were about 3800 mg/L and 1000 mg/L, respectively. Results showed that the removal rates of COD and total nitrogen were above 85% and 95%, respectively, and the effluent COD and total nitrogen were less than 500 mg/L and 40 mg/L under the condition of not adding any carbon source. Also, the specific nitrogen removal rate was 1.48 mgN/(h·gvss). In this process, polyhydroxyalkanoate (PHA) as a critical factor for the highly efficient nitrogen removal (>95%) was approved to be the primary carbon source in the sludge. Because most of the organic matter in raw water was used for denitrification, in the duration of this 160-day experiment, zero discharge of sludge was realized when the effluent suspended solids were 30–50 mg/L.

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High-strength nitrogenous wastewater treatment in biofilm and granule anammox processes

Water Science & Technology ◽

10.2166/wst.2009.133 ◽

2009 ◽

Vol 60 (9) ◽

pp. 2365-2371 ◽

Cited By ~ 3

Author(s):

I. Kim ◽

H. H. Lee ◽

Y. C. Chung ◽

J. Y. Jung

Keyword(s):

Wastewater Treatment ◽

Total Nitrogen ◽

Nitrogen Concentration ◽

High Strength ◽

Biofilm Reactor ◽

Woven Fabric ◽

Ammonium Oxidation ◽

N Removal ◽

Total Nitrogen Concentration ◽

Removal Efficiencies

Biofilm and granule reactors were employed to remove nitrogen via an anammox reaction applying synthetic nitrogen wastewater, whose concentration was in the range of 20 to 1,400 mg N/L as total nitrogen. A biofilm reactor was packed with non-woven fabric and a granule reactor was filled with anaerobic granular sludge taken from the brewery wastewater treatment plant. Both reactors were seeded with Planctomycetes KSU-1 and operated for 450 days. The biofilm reactor showed high NH4+-N and NO2−-N removal efficiencies of over 88% and 94%, respectively, until total nitrogen concentration was reached at 800 mg N/L. However, the biofilm reactor showed severe inhibition at over 1,000 mg N/L of total nitrogen due to nitrogen overloading. The granule reactor revealed better nitrogen removal performance than the biofilm reactor, showing high NH4+-N and NO2−-N removal efficiencies of over 90%, even at a total nitrogen concentration of 1,400 mg N/L. However, aggregation of anammox bacteria grown in the sludge bed after long-term operation resulted in the deterioration of nitrogen. The removal ratio of NH4+-N and NO2−-N was close to 1:1, suggesting other reactions related to ammonium oxidation could occur simultaneously. Free ammonia inhibition as well as NO2−-N could be significant when high-strength nitrogenous wastewater was applied.

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Removal of Ammonia Nitrogen from Landfill Leachate by Ultrasound/Ultraviolet Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.448-453.536 ◽

2013 ◽

Vol 448-453 ◽

pp. 536-539

Author(s):

Bin Liu ◽

Xu Ya Peng ◽

Qi Tian ◽

Hua Zhao

Keyword(s):

Removal Efficiency ◽

Nitrogen Removal ◽

Landfill Leachate ◽

Nitrogen Concentration ◽

Ammonia Nitrogen ◽

Aeration Rate ◽

Ammonia Removal ◽

Ultrasonic Power ◽

High Concentration ◽

Leachate Treatment

Landfill leachate treatment is a major problem to be solved in the field of environmental protection, and ammonia nitrogen is one of the major pollutants in landfill leachate, whose processing technology needs further improvement. In this paper, ultrasound/ultraviolet co-oxidation technology was directly applied to the treatment of high concentration landfill leachate without the pretreatment operations of dilution, filter, and adjusting the pH conditions. The results showed that: ultrasonic and ultraviolet had certain effects on the ammonia nitrogen removal, and the ammonia nitrogen removing effects became better when the ultrasonic power was greater, or the ultraviolet wavelength was shorter. When the ultrasonic power was 100 W, the ammonia nitrogen removal efficiency was 25.2%, and the UV of 254 nm could decompose 20.2% of the ammonia nitrogen in landfill leathate. In the condition of aeration, ultrasonic and ultraviolet had good synergistic effect on leachate ammonia nitrogen treatment. When the ultrasonic power was 100 W, UV wavelength was 254 nm, and the aeration rate was 150 L/h, the ammonia removal efficiency of high concentration leachate (ammonia nitrogen concentration of 1800 mg/L) reached 98.5% after 6 hours. The paper's research results provide a useful reference for the removal of landfill leachate ammonia nitrogen.

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Effect of Ca2+ and Fe3+ Addition on Nitriﬁcation-Denitriﬁcation Process in a Membrane Bioreactor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.422 ◽

2012 ◽

Vol 610-613 ◽

pp. 422-427 ◽

Cited By ~ 1

Author(s):

Mo Jie Sun ◽

Hong Hong Wang ◽

Hai Feng Zhang

Keyword(s):

Total Nitrogen ◽

Nitrogen Removal ◽

Membrane Bioreactor ◽

Removal Rate ◽

Ammonia Nitrogen ◽

Ion Concentration ◽

Ferric Ion ◽

Submerged Membrane Bioreactor ◽

Total Nitrogen Removal ◽

Denitrification Process

Study on the effect of Ca2+and Fe3+addition on nitriﬁcation-denitriﬁcation process in a submerged membrane bioreactor was conducted. The removal rate of total nitrogen and ammonia nitrogen was investigated. The result indicated that the ammonia nitrogen and total nitrogen removal rate increased from 75% to 85% and 55% to 75%, respectively, as the calcium concentration ranging from 0 to 150 mg/L, which indicated that the nitrification and denitrification process were promoted. Ferric ion of 50 mg/L obtained a considerable increase in TN removal from 55% to 70% ,with an increase of ammonia nitrogen removal rate from 75% to 83%. However, ferric ion concentration ranging between 100 mg/L and 150mg/L caused a decrease of both total nitrogen and ammonia nitrogen removal efficiency, indicating that the activity of nitrifying and denitrifying bacteria was inhibited.

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Nitrogen Removal by HN-AD Bacteria Immobilized on Modified Absorbent Stone

Chemical and Biochemical Engineering Quarterly ◽

10.15255/cabeq.2020.1823 ◽

2020 ◽

Vol 34 (3) ◽

pp. 193-207

Author(s):

Wen Zhang ◽

Zhen Zhang ◽

Sufeng Wang

Keyword(s):

Removal Efficiency ◽

Total Nitrogen ◽

Nitrogen Removal ◽

High Efficiency ◽

Removal Rate ◽

Low Cost ◽

Ammonia Nitrogen ◽

Aerobic Denitrification ◽

Immobilized Microorganisms ◽

The Cost

How to simplify the nitrogen removal process, reduce the cost and improve the efficiency has become an urgent problem to be solved. In this research, the isolated HNAD (heterotrophic nitrification and aerobic denitrification) bacteria were used to remove the nitrogen in wastewater. Modified absorbent stone was used as high-efficiency and low-cost immobilized material. The modification effect was determined by the changes in mechanical strength, Zeta potential, pore structure, micrographs and biomass. The practicability of the modified carrier was further proved by experiments of environmental effect and reuse. The modified carrier had excellent performance. By comparing the degradation effects of immobilized microorganism and free microorganism, it was proved that the immobilized microorganisms have broad application prospects and strong adaptability to environmental factors. Under the optimum conditions (temperature of 30 oC, pH of 7, dissolved oxygen of 3.5 mg L–1), the removal efficiency of ammonia nitrogen reached 100 % in 40 hours, the removal efficiency of total nitrogen reached 60.11 % in 50 hours, and the removal rate of total nitrogen was 2.404 mg-NL–1 h–1 by immobilized microorganisms with the treatment of simulated nitrogen-containing wastewater. This research provides new material for the immobilization of HN-AD bacteria and a new way for nitrogen removal.

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