Enhancing algal growth and nutrient recovery from anaerobic digestion piggery effluent by an integrated pretreatment strategy of ammonia stripping and flocculation

Frontiers in Bioengineering and Biotechnology

Bioengineering and Biotechnology

Mutsumi Sekine¹  Tatsuki Toda¹  Shinichi Koga¹  Hongwu Li¹  Yoshiki Takayama¹  Hanwu Song²  Jun Li²  Jun Qian²  Wenguang Zhou²  Jin Liu²  Chengyu Xu² 

[1] Faculty of Science and Engineering, Soka University, Tokyo, Japan;Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, and School of Resources and Environment, Nanchang University, Nanchang, China;

关键词: anaerobic digestion piggery effluent;    ammonia stripping;    chemical flocculation;    microalgae cultivation;    nutrient recovery;   

DOI  :  10.3389/fbioe.2023.1219103

 received in 2023-05-08, accepted in 2023-05-23,  发布年份 2023

来源: Frontiers

【 摘 要 】

Anaerobic digestion piggery effluent (ADPE) with a quite high ammonium (NH4+) concentration and turbidity (dark brown color) generally requires high dilution before microalgae cultivation, owing to its NH4+ toxicity and color inhibition to algal growth. An integrated pretreatment strategy of ammonia stripping and chemical flocculation may be a more practical pretreatment procedure for enhancing algae yield and nutrient recovery from anaerobic digestion piggery effluent. In this study, we determined the optimum pretreatment strategy of anaerobic digestion piggery effluent for subsequent microalgae cultivation and nutrient recovery. The results showed that the integrated anaerobic digestion piggery effluent pretreatment strategy of high-temperature ammonia stripping and chemical flocculation at a mixed dosage of 2 g L−1 polyaluminum chloride (PAC) and 40 mg L−1 cationic polyacrylamide (C-PAM), and 50 mg L−1 ammonium nitrogen (NH4+-N) enrichment provided maximum algal yield (optical density = 1.8) and nutrient removal (95.2%, 98.7%, 99.3%, and 78.5% for the removal efficiencies of total nitrogen, NH4+-N, total phosphorus, and chemical oxygen demand, respectively) from anaerobic digestion piggery effluent. The integrated pretreatment strategy is expected to become a more practical pretreatment procedure for enhancing algae yield and nutrient recovery from anaerobic digestion piggery effluent.

【 授权许可】

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Copyright © 2023 Qian, Xu, Song, Zhou, Toda, Li, Takayama, Sekine, Koga, Li and Liu.