Effect of different organic matters on flocculation of Chlorella sorokiniana and optimization of flocculation conditions in swine manure wastewater. (September 2015)

• Record Type: Journal Article
• Authors: Zhang, Bo; Chen, Sanfeng
• Is Part Of: Bioresource technology. Volume 192(2015)
• Page Start: 774
• Page End: 780
• Publication Date: 2015-09
• Subjects: Chlorella -- Flocculation -- Organic matters -- Response surface methodology (RSM) -- Swine manure wastewater; 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.2015.06.068
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Concentrations of AOM were increased in the medium with glucose. Flocculation in swine manure wastewater was depressed significantly. Tryptone could cause similar inhibitory effect on flocculation as in wastewater. Urea as nitrogen source would scarcely affect flocculation of Chlorella . The best harvest condition in sewage: pH 8.5, dilution (7-folds) and Al 3+ (52 mg/L). Abstract: In this study, flocculation of Chlorella sorokiniana cultivated in swine manure wastewater, BG-11 medium and BG-11 medium supplemented with different organic matters (glucose, urea and tryptone) was investigated. The results demonstrated that the minimum amount of Al 3+ required for complete flocculation in wastewater would increase substantially, and flocculation efficiency became highly sensitive to pH. Tryptone could cause similar extent of inhibition on flocculation as in wastewater. Meanwhile, glucose could increase concentrations of Algogenic Organic Matter (AOM), inhibiting flocculation strongly at higher pH, including flocculation induced by Al 3+ and autoflocculation. However, urea had little effect on flocculation of C. sorokiniana . Moreover, the major factors: dilution times, pH and flocculants dosage, which had significant impact on flocculation efficiency of C. sorokiniana in piggery wastewater, were optimized using response surface methodology (RSM). The optimal flocculation efficiency (100%) was achieved at pH 8.5, 7-folds of dilution and 52.14 mg L −1 of Al 3+ .