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Multiple-cycle operation of sulphur-cycle-enhanced biological phosphorus removal to maintain stable performance at high temperatures
- Wang, Hai-Guang, Biswal, Basanta Kumar, Mao, Yan-Ping, Chen, Guang-Hao, Wu, Di
- Bioresource technology 2019 v.289 pp. 121736
- Psychrobacter, glycogen, high-throughput nucleotide sequencing, phosphorus, polyhydroxyalkanoates, ribosomal RNA, temperature
- This study investigated a new method of multiple-cycle operation of a sulphur-cycle-enhanced biological phosphorus (P) removal system to maintain good phosphorus removal performance at a high temperature (30 °C). The findings demonstrate that P removal was low and unstable under a normal cycle (77 ± 18%), but multiple cycles resulted in a high and quite stable level of P removal (88 ± 9%). Moreover, in the normal mode, the polyhydroxyalkanoate levels increased significantly from 2 to 15 mg C/g of VSS, the glycogen level doubled from 5 to 10 mg C/g of VSS and the polyhydroxyalkanoate and glycogen levels were maintained at considerably low levels after multiple cycles (only 5 C/g of VSS). The 16S rRNA high-throughput sequencing analysis revealed that the genera Thioalbus and Psychrobacter in the gamma-Proteobacteria class were the key functional communities. These findings suggest a high level of P removal with multiple cycles of sulphur-cycle enhanced biological phosphorus removal.