Biological phosphorus removal in sequencing batch reactor with single-stage oxic process |
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Authors: | Wang Dong-Bo Li Xiao-Ming Yang Qi Zeng Guang-Ming Liao De-Xiang Zhang Jie |
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Affiliation: | aCollege of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China |
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Abstract: | The performance of biological phosphorus removal (BPR) in a sequencing batch reactor (SBR) with single-stage oxic process was investigated using simulated municipal wastewater. The experimental results showed that BPR could be achieved in a SBR without anaerobic phase, which was conventionally considered as a key phase for BPR. Phosphorus (P) concentration 0.22–1.79 mg L−1 in effluent can be obtained after 4 h aeration when P concentration in influent was about 15–20 mg L−1, the dissolved oxygen (DO) was controlled at 3 ± 0.2 mg L−1 during aerobic phase and pH was maintained 7 ± 0.1, which indicated the efficiencies of P removal were achieved 90% above. Experimental results also showed that P was mainly stored in the form of intracellular storage of polyphosphate (poly-P), and about 207.235 mg phosphates have been removed by the discharge of rich-phosphorus sludge for each SBR cycle. However, the energy storage poly-β-hydroxyalkanoates (PHA) was almost kept constant at a low level (5–6 mg L−1) during the process. Those results showed that phosphate could be transformed to poly-P with single-stage oxic process without PHA accumulation, and BPR could be realized in net phosphate removal. |
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Keywords: | Biological phosphorus removal Poly-β-hydroxyalkanoates Poly-phosphate Sequencing batch reactor |
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