title: A new activated primary tank developed for recovering carbon source and its application.
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=5d, G=152s(-1) and RSR=10%, SCOD and VFA production were 57.0mg/L and 21.7mg/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.
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China. Electronic address: pkjin@hotmail.com.
authors.forename: Pengkang
authors.initials: P
authors.lastname: Jin
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
authors.forename: Xianbao
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
authors.forename: Qionghua
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
authors.forename: Xiaochang
authors.initials: X
authors.lastname: Wang
authors.affiliation: Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia.
authors.forename: Huu Hao
authors.initials: HH
authors.lastname: Ngo
authors.affiliation: Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala 75120, Sweden.
authors.forename: Lei
authors.initials: L
authors.lastname: Yang
mesh_terms: D001419:Bacteria / Q000235:genetics / Q000378:metabolism; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000302:isolation & purification*; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005285:Fermentation; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012722:Sewage / Q000382:microbiology; D013997:Time Factors; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000382:microbiology; D018508:Water Purification
chemical_list: D002244:Carbon; D005232:Fatty Acids, Volatile; D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
keywords: Activated primary tank; Carbon source recovery; Microbial community; Primary sludge; Sludge elutriation