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Simultaneous di-oxygenation and denitrification in an internal circulation baffled bioreactor
Ling Jiang1, Yingxia Tang1, Weihua Sun1
1Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Guilin Road 100, Shanghai, 200234, People's Republic of China.
Biodegradation
|March 6, 2017
Summary
Adding succinate to a bioreactor enhances phthalic acid (PA) di-oxygenation and nitrate denitrification. This process effectively removes pollutants under varying conditions.
Area of Science:
- Environmental microbiology
- Bioreactor technology
- Wastewater treatment
Background:
- Simultaneous removal of organic pollutants and nitrate is crucial for effective wastewater treatment.
- Phthalic acid (PA) is a common organic pollutant, while nitrate is a key nutrient requiring denitrification.
- Bioreactors offer a controlled environment for microbial degradation processes.
Purpose of the Study:
- To investigate the simultaneous di-oxygenation of phthalic acid (PA) and denitrification of nitrate in an internal circulation baffled bioreactor.
- To evaluate the effect of an exogenous electron donor, succinate, on these simultaneous processes.
- To compare the efficacy of succinate addition with UV/H2O2 advanced oxidation.
Main Methods:
- Utilized an internal circulation baffled bioreactor for simultaneous aerobic and anoxic processes.
- Introduced varying concentrations of phthalic acid (PA).
- Added succinate as an exogenous electron donor and assessed its impact on PA di-oxygenation and nitrate denitrification rates.
- Compared the effects of succinate addition with UV/H2O2 advanced oxidation.
Main Results:
- Succinate addition significantly stimulated both PA di-oxygenation and nitrate denitrification.
- PA removal rates increased by 25% and 42% with 0.17 mM succinate, depending on PA concentration.
- Nitrate removal rates increased by 73% and 51% with 0.17 mM succinate.
- UV/H2O2 advanced oxidation demonstrated similar acceleration effects to succinate addition due to succinate generation.
Conclusions:
- Succinate serves as an effective electron donor to enhance simultaneous PA di-oxygenation and nitrate denitrification in baffled bioreactors.
- The addition of succinate or UV/H2O2 pre-treatment can substantially improve pollutant removal efficiency.
- This approach offers a promising strategy for integrated organic pollutant degradation and nitrogen removal in wastewater treatment.
