Closing Domestic Nutrient Cycles Using Microalgae

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• 作者：T芒nia Vasconcelos Fernandes ; Rabin Shrestha ; Yixing Sui ; Gustavo Papini ; Grietje Zeeman ; Louise E. M. Vet ; Rene H. Wijffels ; Packo Lamers
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：October 20, 2015
• 年：2015
• 卷：49
• 期：20
• 页码：12450-12456
• 全文大小：324K
• ISSN：1520-5851

文摘

This study demonstrates that microalgae can effectively recover all P and N from anaerobically treated black water (toilet wastewater). Thus, enabling the removal of nutrients from the black water and the generation of a valuable algae product in one step. Screening experiments with green microalgae and cyanobacteria showed that all tested green microalgae species successfully grew on anaerobically treated black water. In a subsequent controlled experiment in flat-panel photobioreactors, Chlorella sorokiniana was able to remove 100% of the phosphorus and nitrogen from the medium. Phosphorus was depleted within 4 days while nitrogen took 12 days to reach depletion. The phosphorus and nitrogen removal rates during the initial linear growth phase were 17 and 122 mg路L^鈥?路d^鈥?, respectively. After this initial phase, the phosphorus was depleted. The nitrogen removal rate continued to decrease in the second phase, resulting in an overall removal rate of 80 mg路L^鈥?路d^鈥?. The biomass concentration at the end of the experiment was 11.5 g路L^鈥?, with a P content of approximately 1% and a N content of 7.6%. This high algal biomass concentration, together with a relatively short P recovery time, is a promising finding for future post-treatment of black water while gaining valuable algal biomass for further application.