Removal of nutrients from undiluted anaerobically treated piggery wastewater by improved microalgae. (December 2016)

• Record Type: Journal Article
• Authors: Wang, Mingzi; Yang, Yi; Chen, Zhihong; Chen, Yanzhen; Wen, Yangmin; Chen, Bilian
• Is Part Of: Bioresource technology. Volume 222(2016)
• Page Start: 130
• Page End: 138
• Publication Date: 2016-12
• Subjects: Piggery slurry -- Microalgae -- Nitrogen -- Phosphorus -- Large-scale application; 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.2016.09.128
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Two microalgae and one consortium were induced to grow well in undiluted piggery wastewater, while outstanding TN and TP removal over 90% was achieved. Remarkable removal of TN (89.5%) and TP (85.3%) was achieved when applied in an open raceway pond. UV mutagenesis and domestication were combined for the first time to improve adaptability of microalgae. Abstract: This study aimed at improving the adaptability and biodegradability of tested microalgae in undiluted anaerobic fermentation slurry of piggery wastewater. For that, a two-stage method based on UV irradiation followed by gradual domestication was developed. The distinctness of this method was the elimination of a screening procedure and just needed the UV-irradiated cells with appropriate survival to be subjected to gradual domestication. The microalgae treated with the method not only grew well in undiluted slurry, but achieved outstanding removal efficiencies in total nitrogen (TN) and total phosphorus (TP). Large-scale application was conducted in an open raceway pond, and the concentrations of TN and TP after treatment were 43.80 mg/L (removal rate of 89.5%) and 5.83 mg/L (removal rate of 85.3%) respectively, which greatly excelled the Chinese discharge standards for livestock and poultry wastewater. The strategy is therefore a promising method for microalgae to purify piggery slurry containing high nutrient contents.