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Performance of a novel photobioreactor for nutrient removal from piggery biogas slurry: Operation parameters, microbial diversity and nutrient recovery potential
- Luo, Longzao, Lin, Xiaoai, Zeng, Fanjian, Luo, Shuang, Chen, Zongbao, Tian, Guangming
- Bioresource technology 2019 v.272 pp. 421-432
- biogas, biomass production, harvesting, income, microalgae, nitrogen, phosphorus, photobioreactors, pig manure, slurries, spraying, wastewater
- Photobioreactor is deemed to be one of limiting factors for the commercial application of wastewater treatment based on microalgae cultivation. In this study, a novel Flat-Plate Continuous Open Photobioreactor (FPCO-PBR) was developed to treat piggery biogas slurry. The operation parameters, microbial stability and nutrient recovery potential of FPCO-PBR were investigated. Results showed that the appropriate influent mode for FPCO-PBR was multi-point or spraying mode. The optimal hydraulic retention time and interval time for biomass harvesting of FPCO-PBR were both 2 d. Nitrogen and phosphorus recovery rate were 30 mg L−1 d−1 and 7 mg L−1 d−1 respectively under optimal operating parameters. Microbial diversity remained relatively stable in FPCO-PBR. Biomass production rate of FPCO-PBR was 0.47 g L−1 d−1 under optimal operating parameters. The revenue generated from biomass was estimated to be 15.06 $ kg−1, which means that treating one ton of wastewater can generate $ 7.08 in revenue.