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Study of Nitrogen Removal Performance When Treating Low Carbon Sewage Using External Solid Carbon Sources in SBBR
Li-Qiu Zhang1,2, Pei-Fen He1, Dan Wu1
1School of Civil Engineering, Guangzhou University, Guangzhou 510006, China.
Biomed Research International
|February 2, 2018
Summary
Corncob effectively releases organic matter for treating low carbon wastewater. This study found corncob is a safe, optimal carbon source for simultaneous nitrification and denitrification, meeting national discharge standards.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Wastewater Management
Background:
- Low carbon wastewater presents challenges for effective nitrogen removal.
- External solid carbon sources are explored to enhance biological nutrient removal processes.
Purpose of the Study:
- To evaluate corncob as a sustainable solid carbon source for low carbon wastewater treatment.
- To optimize corncob dosage for simultaneous nitrification and denitrification (SND).
- To assess the safety and release characteristics of corncob organic matter.
Main Methods:
- Investigated corncob organic matter release potential and heavy metal leaching.
- Utilized a sequencing biofilm batch reactor (SBBR) to study SND performance.
- Varied corncob dosage in low carbon wastewater under controlled conditions (28–31°C, pH 7.5–8.0, DO 4.0 ± 0.2 mg/L).
Main Results:
- Corncob exhibited linear organic matter release with heavy metal concentrations below national safety standards.
- Optimal corncob dosage was determined to be 5 g per 1.5 L of wastewater.
- Effluent ammonia nitrogen (NH4+-N) and total nitrogen (TN) averaged 2.85 mg/L and 4.51 mg/L, respectively.
- Treated effluent met the Grade A standard of China's sewage treatment plant pollutant discharge standard.
Conclusions:
- Corncob is a safe and effective external solid carbon source for low carbon wastewater treatment.
- Optimized corncob dosing in SBBRs facilitates efficient simultaneous nitrification and denitrification.
- The study demonstrates a viable method for upgrading wastewater treatment plant performance using agricultural waste.
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