Combined process of urea nitrogen removal in anaerobic Anammox co-culture reactor

Excess nitrogen in urban river networks leading to eutrophication has become one of the most urgent environmental problems. Combinations of different aeration and biofilm techniques was designed to remove nitrogen from rivers. In laboratory water tank simulation experiments, we assessed the removal efficiency of nitrogen in both the overlying water and sediments by using the combination of the aeration and biofilm techniques, and then analyzed the transformation of nitrogen during the experiments. Aeration (especially sediment aeration) combined with the biofilms techniques was proved efficient in removing nitrogen from polluted rivers. Results indicated that the combination of sediment aeration and biofilms, with the highest nitrogen removal rate from the overlying water and sediments, was the most effective combined process, which especially inhibited the potential release of nitrogen from sediments by reducing the enzyme activity. It was found that the content of dissolved oxygen in water could be restored on the basis of the application of aeration techniques ahead, and the biofilm technique would be effective in purifying water in black-odor rivers.

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A continuous-flow combined process based on partial nitrification-Anammox and partial denitrification-Anammox (PN/A + PD/A) for enhanced nitrogen removal from mature landfill leachate

Bioresource Technology ◽

10.1016/j.biortech.2019.122483 ◽

2020 ◽

Vol 297 ◽

pp. 122483 ◽

Cited By ~ 4

Author(s):

Zhong Wang ◽

Liang Zhang ◽

Fangzhai Zhang ◽

Hao Jiang ◽

Shang Ren ◽

...

Keyword(s):

Nitrogen Removal ◽

Landfill Leachate ◽

Continuous Flow ◽

Partial Nitrification ◽

Combined Process ◽

Mature Landfill Leachate

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Nitrogen removal in micro-polluted surface water by the combined process of bio-filter and ecological gravel bed

Water Science & Technology ◽

10.2166/wst.2013.130 ◽

2013 ◽

Vol 67 (10) ◽

pp. 2356-2362 ◽

Cited By ~ 8

Author(s):

He Sheng-bing ◽

Gao Jian-wen ◽

Chen Xue-chu ◽

Dai Ding-li

Keyword(s):

Surface Water ◽

Carbon Source ◽

Water Temperature ◽

Nitrogen Removal ◽

Significant Influence ◽

Sodium Acetate ◽

Denitrification Rate ◽

Combined Process ◽

Gravel Bed ◽

Hydraulic Load

Nitrogen removal in micro-polluted surface water by the combined process of a bio-filter and an ecological gravel bed was studied. Sodium acetate was added into micro-polluted surface water as carbon source and the nitrogen removal under different C/N ratio, hydraulic load and temperature were investigated. The results showed that the variations in C/N ratio, hydraulic load and temperature have significant influence on nitrogen removal in bio-filter. It was found that the denitrification rate was above 90% when C/N ratio reached 10; also, the denitrification was inhibited at low water temperature (2–10 °C); at the condition of water temperature above 20 °C, C/N ratio 10, hydraulic load 8 m3/(m2 h), the combined process obtained the nitrogen removal of more than 90%, and the residual organics could be removed in ecological gravel bed.

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Application of combined process of partial nitritation - anammox using a rotating biological contactor (PARBC) to treat ammonium-rich wastewater

Science and Technology Development Journal ◽

10.32508/stdj.v19i4.589 ◽

2016 ◽

Vol 19 (4) ◽

pp. 5-16

Author(s):

Hien Nhu Nguyen ◽

Van Thi Thanh Truong ◽

Son Thanh Le ◽

Nhat The Phan ◽

Dan Phuoc Nguyen

Keyword(s):

Nitrogen Removal ◽

Removal Rate ◽

Synthetic Wastewater ◽

Anammox Bacteria ◽

Rotating Biological Contactor ◽

Combined Process ◽

Partial Nitritation ◽

Anammox Activity ◽

Startup Time ◽

Autotrophic Nitrogen Removal

Combining the partial Nitritation and Anammox using a rotating biological contactor (PARBC) to remove the ammonium in wastewater was evaluated in this study. The accumulation of Anammox bacteria on the carrier easily obtained after 5 days operating of sequence batch with synthetic wastewater. Then AOB biomass cultivated in PARBC to complete the process of combining two bacteria in the same reactor for completely autotrophic nitrogen removal. After 60 batches of the operation, highest nitrogen removal rate reached 0.33 kg N/m3.d with nitrogen removal efficiency is 90% at a concentration of ammonium input of 250 mg N/L. The specific Anammox activity (SAA) of biofilm and suspended sludge in the tank is determined to be 0.298 gN-N2/gVSS/day and 0.0041 gN-N2/gVSS/day, respectively. Moreover, the suspended sludge concentration is 17.765 mg MLSS/L. This result showed that Anammox bacteria adapt and grow on the rotating biological carrier; otherwise Anammox bacteria hardly develop in the form of suspended sludge in the tank. This study shows that the PARBCR has great potential to effectively removing ammonium from wastewater with the short startup time.

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