A novel AAO-SBSPR process based on phosphorus mass balance for nutrient removal and phosphorus recovery from municipal wastewater

Water Research
Zhengyu ZhuYongmei Li

Abstract

A novel AAO-SBSPR (Anaerobic-Anoxic-Oxic/Sequencing Batch Sidestream Phosphorus Recovery) process was developed for phosphorus (P) recovery and nutrient removal from municipal wastewater. Meanwhile, an operational strategy based on the P mass balance for the process was proposed, where P recovery rate was coupled with sludge retention time (SRT) so as to reduce the impact of P recovery on P content in activated sludge and maintain a stable operation of the process. The results show that the proposed operational strategy is helpful for the stable operation of the AAO-SBSPR process and up to 65% of the influent P was recovered with the phosphate removal efficiency of 99.1%. Both P recovery and extended SRT had limited influence on the P release and uptake rates of polyphosphate accumulating organisms (PAOs). The results of high-throughput sequencing analysis indicated that the relative abundance of Accumulibacter increased while SRT was extended under high P recovery rate. Moreover, significant promotion of simultaneous nitrogen removal and P uptake was observed, where the ratio of anoxic P uptake to the total P uptake of the whole process increased from 41.7% in the AAO process to 77.5% in the AAO-SBSPR process, combined with th...Continue Reading

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