An effective titanium salt dosing strategy for phosphorus removal from wastewater: Synergistic enhancement of chemical and biological treatment.

Sci Total Environ

National Engineering Laboratory for Municipal Wastewater Treatment and Reuse Technology, Department of Environmental Engineering, Beijing University of Technology, Beijing 100124, China.

Published: October 2022

Titanium salt coagulant, as a new type of water treatment agent, has been widely studied, but most researches do not consider its effect on the biological treatment. In this study, different doses of TiCl were added to the biological phosphorus removal (BPR) system to investigate the impact of TiCl on BPR. The results showed that the addition of TiCl not only significantly reduced the phosphorus concentration in effluent (below 0.5 mg/L), but also kept it stable. Moreover, the sedimentation performance of activated sludge was improved, which was superior to the control group. According to the results of flow cytometry (FCM), a small amount of TiCl significantly improved the bioactivities, but excessive dosage caused inhibition. When the dosage of TiCl below 20 mg/L, polyphosphate accumulating metabolism (PAM) was strengthened. In addition, the richness of microbial community and the relative abundance of Candidatus Accumulibacter clades also increased. However, when the dosage reached 60 mg/L, the relative abundance of Candidatus Competibacter increased and the BPR system was deteriorated. This study suggests that the addition of appropriate concentration of TiCl can realize the synergistic enhancement of biological and chemical phosphorus removal in sewage treatment.

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http://dx.doi.org/10.1016/j.scitotenv.2022.156960DOI Listing

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