Study on Anaerobic Simultaneous Denitrification and Methanogenesis Combined with Shortcut Nitrification Process Treating Piggery Wastewater

2012 ◽  
Vol 178-181 ◽  
pp. 680-687
Author(s):  
Ru Liu ◽  
Ying Hao Song ◽  
Huan Sheng Wang
Keyword(s):  
Nitrogen Removal ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Reflux Ratio ◽  
Combined System ◽  
Piggery Wastewater ◽  
Anaerobic Reactor ◽  
Whole Process ◽  
Nitrite Removal ◽  
Removal Efficiencies

An expanded granular sludge bed (EGSB) was combined with an anaerobic/anoxic/oxic process (A2/O) to treat piggery wastewater, in which the EGSB was used as a simultaneous methanogenesis and denitrification reactor and the A2/O as an shortcut nitrification reactor. The results showed that: 1) The COD of effluent in anaerobic reactor increased in earlier stage and decreased in later stage with increasing reflux ratios each time, and reached to about 550 mg/L finally. The COD removal efficiencies of the whole process were about 150 mg/L, and almost not affected by different reflux ratios. 2) Simultaneous denitrification and methanogenesis realized successfully after the aerobic effluent recirculated to the anaerobic reactor. The highest nitrite loading reached 1.48 kg/m3.d with constant increase of reflux ratio, while nitrite removal efficiencies were always 100%. 3) Short-cut nitrification was perfored steadily in the whole combined system. When reflux ratios were 50%, 100%, 200%, 300%, respectively, ammonia nitrogen removal efficiencies were all 100%, and total nitrogen removal efficiencies were 52.3%, 53.1%, 68.7%,85.1%, respectively. 4) The first reaction was denitrification when nitrite was recycled to anaerobic reactor, so methane contents were very little in earlier stage with increasing reflux ratios every time, but increased gradually after a period of operation.

Nitrifier Augmentation for High Ammonia Nitrogen Removal by Aerobic Granular Sludge at Low Temperatures

2016 ◽  
Vol 44 (5) ◽  
pp. 525-531 ◽  
Author(s):  
Shuo Wang ◽  
Qianqian Yang ◽  
Wenxin Shi ◽  
Shuili Yu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Low Temperatures ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Aerobic Granular Sludge ◽  
High Ammonia

Treatment of high loaded swine slurry in an aerobic granular reactor

2011 ◽  
Vol 63 (9) ◽  
pp. 1808-1814 ◽  
Author(s):  
M. Figueroa ◽  
A. Val del Río ◽  
J. L. Campos ◽  
A. Mosquera-Corral ◽  
R. Méndez
Keyword(s):  
Organic Matter ◽  
Nitrogen Removal ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Average Diameter ◽  
Nitrogen Loading ◽  
Aerobic Granular Sludge ◽  
Swine Slurry ◽  
Start Up ◽  
Removal Efficiencies

Aerobic granular sludge grown in a sequential batch reactor was proposed as an alternative to anaerobic processes for organic matter and nitrogen removal from swine slurry. Aerobic granulation was achieved with this wastewater after few days from start-up. On day 140 of operation, the granular properties were: 5 mm of average diameter, SVI of 32 mL (g VSS)−1 and density around 55 g VSS (Lgranule)−1. Organic matter removal efficiencies up to 87% and nitrogen removal efficiencies up to 70% were achieved during the treatment of organic and nitrogen loading rates (OLR and NLR) of 4.4 kg COD m−3 d−1 and of 0.83 kg N m−3 d−1, respectively. However, nitrogen removal processes were negatively affected when applied OLR was 7.0 kg COD m−3 d−1 and NLR was 1.26 kg N m−3 d−1. The operational cycle of the reactor was modified by reducing the volumetric exchange ratio from 50 to 6% in order to be able to treat the raw slurry without dilution.

scholarly journals Comparison of Swine Wastewater Treatment by Microalgae and Heterotrophic Nitrifiers: Focusing on Nitrogen Removal Mechanism Revealed by Microbiological Correlation Analysis

2021 ◽  
Author(s):  
Hui Liu ◽  
Junyu Liang ◽  
Giorgos Markou ◽  
Zhaofeng Song ◽  
Jianfeng Ye
Keyword(s):  
Correlation Analysis ◽  
Nitrogen Removal ◽  
Ammonia Nitrogen ◽  
Heterotrophic Nitrification ◽  
Swine Wastewater ◽  
Nitrifying Bacteria ◽  
Nitrogen Transfer ◽  
Bacterial Strains ◽  
Removal Efficiencies ◽  
Heterotrophic Nitrifying Bacteria

Abstract Swine wastewater (SW) poses a great threat to the environment due to its high-nutrient profiles if not properly managed. Advanced biological treatment method is an efficient method to treat SW by screening potent microalgae or bacterial strains. In this study, activated sludge, nine locally isolated heterotrophic nitrification bacteria and one microalgal strain (Chlorella) were used as inoculums in treating a local SW. Their treatment efficiencies were compared, while the nitrogen removal mechanisms and microbiome profile were explored in detail. It was found that certain heterotrophic nitrification strains had a slight advantage in removing chemical oxygen demand and phosphorus from SW, with the highest removal efficiencies of 83.9% and 76.2%, respectively. The removal efficiencies of ammonia nitrogen and total nitrogen in wastewater by microalgae reached 80.9% and 66.0% respectively, which were far higher than all the heterotrophic nitrification strains. Biological assimilation was the main pathway of nitrogen conversion by microalgae and heterotrophic nitrifying bacteria; especially microalgae showed excellent biological assimilation performance. Correlation analysis showed that Comamonas was highly positively correlated with nitrogen assimilation, while Acidovorax was closely correlated with simultaneous nitrification and denitrification. This study gives a comparison of microalgae and heterotrophic nitrifying bacteria on the nitrogen transfer and transformation pathways.

scholarly journals The Influence of Different Operation Conditions on the Treatment of Mariculture Wastewater by the Combined System of Anoxic Filter and Membrane Bioreactor

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 729
Author(s):  
Yi Ding ◽  
Zhansheng Guo ◽  
Binyu Ma ◽  
Fang Wang ◽  
Hong You ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Total Nitrogen ◽  
Membrane Bioreactor ◽  
Ammonia Nitrogen ◽  
Phosphate Removal ◽  
Combined System ◽  
Operation Conditions ◽  
Removal Efficiencies ◽  
Total Nitrogen Removal ◽  
Better Than

The mariculture wastewater treatment performance for the combined system of anoxic filter and membrane bioreactor (AF-MBR) was investigated under different hydraulic retention times (HRTs), influent alkalinity, and influent ammonia nitrogen load. The results showed that the removal efficiencies of TOC and total nitrogen were slightly better at the HRT of 8 h than at other HRTs, and the phosphate removal efficiency decreased with the increase of HRT. With the increase of influent alkalinity, the removal of TOC and phosphate did not change significantly. With the increase of influent alkalinity from 300 mg/L to 500 mg/L, the total nitrogen removal efficiency of AF-MBR was improved, but the change of the removal efficiency was not obvious when the alkalinity increased from 500 mg/L to 600 mg/L. When the influent concentration of ammonia nitrogen varied from 20 mg/L to 50 mg/L, the removal efficiencies of TOC, phosphate, and total nitrogen by AF-MBR were stable. An interesting finding was that in all the different operation conditions examined, the treatment efficiency of AF-MBR was always better than that of the control MBR. The concentrations of NO3−-N in AF-MBR were relatively low, whereas NO3−-N accumulated in the control MBR. The reason was that the microorganisms attached to the carrier and remained fixed in the aerobic and anoxic spaces, so that there was a gradual enrichment of bacteria characterized by slow growth in a high-salt environment. In addition, the microorganisms could gather and grow on the carrier forming a biofilm with higher activity, a richer and more stable population, and enhanced ability to resist a load impact.

Startup of Denitrification Bioreactor and Influence of Temperature and DO for Treatment

2011 ◽  
Vol 374-377 ◽  
pp. 913-918
Author(s):  
Ya Feng Li ◽  
Jia Yuan Liu ◽  
Yan Zhang
Keyword(s):  
Nitrogen Removal ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
National Standard ◽  
Stable Operation ◽  
Reflux Ratio ◽  
Influence Of Temperature ◽  
Small Influence ◽  
Denitrification Bioreactor ◽  
Biological Nitrogen

The sewage is used for startup and stable operation of the test, Startup in simultaneous nitrification-denitrification of Denitrification Bioreactor and Influence of Temperature and DO for Treatment was studied in the test. The results showed that, When the temperature was 30 degree Celsius, DO was 0.3-0.5mg/L，pH was 8 and reflux ratio was 300%, the removal rate of COD,ammonia nitrogen and total nitrogen reached stability after domestication of 58 days, and the quality of effluent achieved the A national standard. There is small influence of temperature for COD removal and large influence of temperature for ammonia nitrogen removal. Biological nitrogen removal process was not fit to operate in low temperature, and the suitable temperature was from 20 degree Celsius to35 degree Celsius. With DO increasing, the removal rates of COD and NH4+-N was increasing and then kept in a constant value. When DO was 0.4 mg/L, the removal rate of TN reached the maximum and it was 75.86%

Research of Carbon and Nitrogen Ratio and Sludge Stability in Aerobic Granular Sludge Bioreactor

2012 ◽  
Vol 518-523 ◽  
pp. 473-477
Author(s):  
Xia Zhao ◽  
Hui Xia Feng ◽  
Feng Jiang ◽  
Na Li Chen ◽  
Xiao Chun Wang
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Nitrifying Bacteria ◽  
Aerobic Granular Sludge ◽  
Nitrogen Ratio ◽  
The Stability

In sequencing batch reactor aerobic granular sludge was cultivated, and the influence of influent C/N ratio to aerobic granular sludge was studied. The results showed that the granulation and the settling ability of the sludge were poor in high C/N, however, low C/N was beneficial to the accumulation of microorganism in reactor and MLSS could reach to as high as 8740 mg/L. Lower C/N ratio would lead to increase of particle size and disintegrate of loose structure and overgrowth on filamentous microbe, these were disadvantage of the stability of the system. It was not obvious that influent C/N ratio affected on the organic removal. The COD removal maintained at 87% after the preliminary form particles were formed in reactor. When C/N ratio was 100:15~100:35, the phosphorus removal efficiency was good. If C/N ratio was too high or too low, the formation of sludge granulation would be affected in the process. The influence of C/N ratio to ammonia nitrogen removal efficiency was obvious. While C/N ratio was 100:10, granular sludge had good simultaneous nitrification and denitrification performance, and the average removal of ammonia nitrogen attained to 91%. But low C/N ratio was able to inhibit the activity of nitrifying bacteria and denitrifying bacteria. At that time, ammonia nitrogen removal rate declined sharply in the system.

Study on Aerobic Nitrogen Removal in Double Membrane Bio-Reactor

2015 ◽  
Vol 1092-1093 ◽  
pp. 923-926
Author(s):  
Shan Hong Lan ◽  
Chuan Lu Wang ◽  
Hui Jie Li ◽  
Heng Zhang ◽  
Hui Xia Lan
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Nitrate Concentration ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Nitrite Concentration ◽  
Double Membrane ◽  
Whole Process ◽  
Activated Sludge System ◽  
Simulated Wastewater

The double membrane bio-reactor was used to treat the simulated wastewater under aerobic conditions, and the aerobic activated sludge system was set as the control. At the beginning of acclimation, COD removal efficiency in double membrane bio-reactor was higher than that of aerobic activated sludge system, but difference between two systems was little in later stage. The ammonia nitrogen removal rate in double membrane bio-reactor was significantly higher than aerobic activated sludge throughout the whole acclimation stage and nitrite concentration in the effluent from double membrane bio-reactor was lower than that of from aerobic activated sludge, while the nitrate concentration was higher. The nitrite was not accumulated in double membrane bio-reactor through the whole process of acclimation, while the accumulation of nitrate happened in aerobic activated sludge system.

Treatment of Different Wastewaters from Pulp and Paper Industry in Methane Reactors

1985 ◽  
Vol 17 (1) ◽  
pp. 223-230 ◽  
Author(s):  
P K Latola
Keyword(s):  
Power Plant ◽  
Paper Industry ◽  
Granular Sludge ◽  
Paper Mill ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Plastic Foam ◽  
Loading Rates ◽  
Multi Stage ◽  
Removal Efficiencies

A wastewater from an integrated paper mill with a COD of 1200 mg/dm3 was anaerobically treated in a multi-stage reactor. The BOD7 removal efficiencies of 60-75 % were achieved at maximal loading rates of 5-6 kg COD/m3d and HRT of 4-6 hours due to the granular sludge. Industrial sulphite evaporator condensates from Ca- and Na-processes were treated in anaerobic filters containing light gravel, plastic foam and power plant slag as filter media. The BOD7 removals of 78 % on average were achieved at loading rates of 1.8-3.3 kg COD/m3d with Ca-process evaporator condensates and 80 % BOD7 removals were achieved with Na-process condensates at loading rates of 3.5-4.1 kg COD/m3d.

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