A new activated primary tank developed for recovering carbon source and its application. (January 2016)

• Record Type: Journal Article
• Authors: Jin, Pengkang; Wang, Xianbao; Zhang, Qionghua; Wang, Xiaochang; Ngo, Huu Hao; Yang, Lei
• Is Part Of: Bioresource technology. Volume 200(2016)
• Page Start: 722
• Page End: 730
• Publication Date: 2016-01
• Subjects: Activated primary tank -- Primary sludge -- Carbon source recovery -- Sludge elutriation -- Microbial community; 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.2015.10.097
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A new activated primary tank (APT) was developed to recover carbon source from sludge. APT was beneficial for the breeding of fermentative bacteria and maximised VFAs yield. Mechanical elutriation significantly promoted the release of fermentation products. APT was applied in a sewage treatment plant and recovered carbon source successfully. Abstract: A novel activated primary tank process (APT) was developed for recovering carbon source by fermentation and elutriation of primary sludge. The effects of solids retention time (SRT), elutriation intensity (G) and return sludge ratio (RSR) on this recovery were evaluated in a pilot scale reactor. Results indicated that SRT significantly influenced carbon source recovery, and mechanical elutriation could promote soluble COD (SCOD) and VFA yields. The optimal conditions of APT were SRT = 5 d, G = 152 s −1 and RSR = 10%, SCOD and VFA production were 57.0 mg/L and 21.7 mg/L. Particulate organic matter in sludge was converted into SCOD and VFAs as fermentative bacteria were significantly enriched in APT. Moreover, the APT process was applied in a wastewater treatment plant to solve the problem of insufficient carbon source. The outcomes demonstrated that influent SCOD of biological tank increased by 31.1%, which improved the efficiency of removing nitrogen and phosphorus.