Pilot study for the potential application of a shortcut nitrification and denitrification process in landfill leachate treatment with MBR

An advanced nitrogen removal pilot study was performed in China's Xia Ping Landfill Leachate Treatment Plant to undertake shortcut nitrification and denitrification with the Membrane Bio-reactor (MBR) process. It was found that the MBR process used 25% less of the oxygen and 40% less of the external carbon sources, compared to the conventional nitrification and denitrification process. The key feature of the MBR process is that it provides an environment more favorable for ammonia oxidation bacterium (AOB) than for nitrite oxidation bacterium (NOB) through controlling loading, pH, temperature, dissolved oxygen concentration (DO), and NH3 inhibition. Optimum operating condition was examined through continuous running of the pilot MBR, and it was found that a minimum HRT of 4.3 days and maximum ammonia loading of 0.6 kg N- NH4+ m3.d with pH 7–8.5, temperature 25–30 °C, and DO at 2 mg/L is favorable to AOB. Kinetic study was conducted to identify the characteristic of the microorganisms in the system. Measured Ks and μA,max of MBR sludge was 19.65 mg NH4-N/L (Temperature 25 °C, pH 8.5) and 0.26 d−1, respectively.

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Anodic Oxidation of Effluents from Stages of MBR-UF Municipal Landfill Leachate Treatment Plant

Environmental Engineering Science ◽

10.1089/ees.2020.0003 ◽

2020 ◽

Vol 37 (10) ◽

pp. 702-714

Author(s):

Zubeda Ukundimana ◽

Mehmet Kobya ◽

Philip Isaac Omwene ◽

Erhan Gengec ◽

Orhan Taner Can

Keyword(s):

Anodic Oxidation ◽

Landfill Leachate ◽

Treatment Plant ◽

Leachate Treatment ◽

Municipal Landfill

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Taxonomic and functional variations in the microbial community during the upgrade process of a full-scale landfill leachate treatment plant — from conventional to partial nitrification-denitrification

Frontiers of Environmental Science & Engineering ◽

10.1007/s11783-020-1272-7 ◽

2020 ◽

Vol 14 (6) ◽

Author(s):

Binbin Sheng ◽

Depeng Wang ◽

Xianrong Liu ◽

Guangxing Yang ◽

Wu Zeng ◽

...

Keyword(s):

Microbial Community ◽

Landfill Leachate ◽

Treatment Plant ◽

Full Scale ◽

Partial Nitrification ◽

Leachate Treatment

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Strategy for nitrogen removal from piggery waste

Water Science & Technology ◽

10.2166/wst.2002.0699 ◽

2002 ◽

Vol 46 (6-7) ◽

pp. 347-354 ◽

Cited By ~ 11

Author(s):

E. Choi ◽

Y. Eum

Keyword(s):

Nitrogen Removal ◽

Treatment Plant ◽

Nitrogen Loading ◽

Full Scale ◽

Organic Load ◽

Optimum Operating ◽

Organic Loading Rate ◽

Activated Carbon Adsorption ◽

Optimum Operating Condition ◽

Ammonia Stripping

This study was conducted with an influent containing about 20% solids, obtainable from scraper type separation resulting in about 40 g/L TCOD and 5.5 g/L TKN, to find an optimum operating condition for nitrogen removal. Both laboratory scale reactors and a full scale treatment plant removed 80 to 90% nitrogen by biological means up to 35°C with 10% by ammonia stripping. The full scale plant however was operated at 35 to 45°C, and at 45°C, 30% nitrogen was removed by biological means, 50% by ammonia stripping, 14% by chemical coagulation and 6% by activated carbon adsorption, respectively. Struvite formation could not be observed at 30°C or higher. Nitrite nitrification and denitrification could save about 35% in tank volume and 50% in carbon requirements at 25°C, respectively. For a complete denitrification with a proper temperature, the influent TCOD/TKN ratio must exceed 6 with oxic/total reactor volume ratio of 0.5. The influent TCOD level or organic load should be lower so as not to increase the reactor temperature above 35°C and avoid nitrification inhibition. The estimated optimum nitrogen loading rates were 0.15 for summer and 0.23 kgTKN/m3/d for winter, respectively. With a cooling facility, the nitrogen loads could be increased to 0.35 kgTKN/m3/d equivalent to an organic loading rate of 2.5 kgCOD/m3/d.

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Optimization of nitrogen removal from piggery waste by nitrite nitrification

Water Science & Technology ◽

10.2166/wst.2002.0413 ◽

2002 ◽

Vol 45 (12) ◽

pp. 89-96 ◽

Cited By ~ 17

Author(s):

Y. Eum ◽

E. Choi

Keyword(s):

Nitrogen Removal ◽

Volume Ratio ◽

Ph Control ◽

Nitrogen Loading ◽

Optimum Operating ◽

Optimum Operating Condition ◽

Nitrogen Loads ◽

Study Results ◽

Waste Characteristics ◽

Nitrification And Denitrification

The piggery waste characteristics greatly vary with types of manure collections and the amount of water used. If solids are separated well, the waste strength will be greatly reduced resulting in lower TCOD/TKN ratio of 4 (average). If solids are separated by a mechanical scraper, some solids will remain and the waste strength will be increased with a TCOD/TKN ratio of 7. This study was conducted to find an optimum operating condition for nitrogen removal with these two ratios. Nitrite nitrification was targeted because it could be a short cut process for savings in oxygen for nitrification and carbon requirements for denitrification. The study results indicated that nitrogen loading rate and pH were the most important factors to be considered for stable nitrite nitrification. The applicable nitrogen loads were estimated to be 0.3 to 2.0 kgTKN/oxic m3/d for high TCOD/TKN ratio without pH control. With higher pH > 8, NO2N/NOxN ratios in oxic stages even with lower nitrogen loads were increased. The SBR with low TCOD/TKN ratio less than 4 required additional alkalinity. For a complete denitrification, the influent TCOD/TKN ratio must exceed 6 with oxic/total reactor volume ratio of 0.5. Nitrite nitrification and denitrification could save about 35% in tank volume and 50% in carbon requirement, respectively. However, 9.5% oxygen saving could be expected during the operation with low TCOD/TKN ratio. The elevated temperature due to the heat released from COD removal also enhanced microbial activities for nitrification and denitrification as well as ammonia stripping. However, careful attention must be provided for the reactor temperature not to inhibit the nitrification process.

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