Algal biomass production by phosphorus recovery and recycling from wastewater using amorphous calcium silicate hydrates.

Tsuyoshi Aketo, Kentaro Waga, Yusuke Yabu, Yoshiaki Maeda, Tomoko Yoshino, Akiko Hanada, Koki Sano, Takashi Kamiya, Hiroyuki Takano, Tsuyoshi Tanaka

Bioresource technology 2021 Nov

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The phosphorous supply crisis is a major challenge for a sustainable society, and the algal industry is not unrelated to this crisis. Recycling phosphorus from sewage wastewater is a potential way to address this issue. We previously developed amorphous calcium silicate hydrates (aCSH) as excellent phosphorus recovery materials. In this study, we designed a phosphorus recovery process using aCSH in a pilot-scale facility connected to a sewage wastewater treatment plant, and demonstrated the production of microalgal biomass using phosphorous-containing aCSH (P_aCSH). As a result, high phosphorous recovery rates (>80%) were obtained throughout the year. The carbohydrate-rich microalga Pseudoneochloris sp. NKY372003 was cultivable with P_aCSH. The biomass and carbohydrate productivity of this microalga with P_aCSH was comparable to that with conventional media. Approximately 94% of the phosphorus in P_aCSH was recycled into the biomass. This study successfully demonstrated the recycling the phosphorus recovered from wastewater for microalgal cultivation by aCSH. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Tsuyoshi Aketo, Kentaro Waga, Yusuke Yabu, Yoshiaki Maeda, Tomoko Yoshino, Akiko Hanada, Koki Sano, Takashi Kamiya, Hiroyuki Takano, Tsuyoshi Tanaka. Algal biomass production by phosphorus recovery and recycling from wastewater using amorphous calcium silicate hydrates. Bioresource technology. 2021 Nov;340:125678