Balancing carbon/nitrogen ratio to improve nutrients removal and algal biomass production in piggery and brewery wastewaters. (February 2018)

• Record Type: Journal Article
• Authors: Zheng, Hongli; Liu, Mingzhi; Lu, Qian; Wu, Xiaodan; Ma, Yiwei; Cheng, Yanling; Addy, Min; Liu, Yuhuan; Ruan, Roger
• Is Part Of: Bioresource technology. Volume 249(2018)
• Page Start: 479
• Page End: 486
• Publication Date: 2018-02
• Subjects: Microalga -- Piggery wastewater -- Brewery wastewater -- Carbon/nitrogen ratio; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.10.057
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Piggery wastewater exhibited low carbon/nitrogen mass ratio. Brewery wastewater had high carbon/nitrogen mass ratio. Mixing the wastewaters balanced the carbon/nitrogen mass ratio. The optimal carbon/nitrogen mass ratio of mixed wastewater was 7.9. Strategies for enhancing nutrients removal and biomass production were established. Abstract: To improve nutrients removal from wastewaters and enhance algal biomass production, piggery wastewater was mixed with brewery wastewaters. The results showed that it was a promising way to cultivate microalga in piggery and brewery wastewaters by balancing the carbon/nitrogen ratio. The optimal treatment condition for the mixed piggery-brewery wastewater using microalga was piggery wastewater mixed with brewery packaging wastewater by 1:5 at pH 7.0, resulting in carbon/nitrogen ratio of 7.9, with the biomass concentration of 2.85 g L −1, and the removal of 100% ammonia, 96% of total nitrogen, 90% of total phosphorus, and 93% of chemical oxygen demand. The application of the established strategies can enhance nutrient removal efficiency of the wastewaters while reducing microalgal biomass production costs.