Phosphorus removal performance and population structure of phosphorus-accumulating organisms in HA-A/A-MCO sludge reduction process. Issue 5 (2nd September 2016)

• Record Type: Journal Article
• Authors: Zuo, Ning; He, Jinchao; Ma, Xiqin; Peng, Yongqin; Li, Xia
• Is Part Of: Bioengineered. Volume 7:Issue 5(2016)
• Page Start: 327
• Page End: 333
• Publication Date: 2016-09-02
• Subjects: anaerobic phosphorus release -- nitrogen and phosphorus removal -- phosphorus-accumulating organisms -- population structure -- sludge reduction; Biomedical engineering -- Periodicals; Biotechnology -- Periodicals; Microbiology -- Periodicals; 660.6
• DOI: 10.1080/21655979.2016.1197026
• Languages: English
• ISSNs: 2165-5987

Abstract

ABSTRACT: We developed a new sludge reduction HA-A/A-MCO (Hydrolysis-Acidogenosis-Anaerobic/Anoxic -Multistep Continuous Oxic tank) process, which has improved phosphate (P) and nitrogen (N) removal. Its biological treatment unit uses an A 2 /O P & N removal process with hydrolysis acidification, multistep continuous aeration, and continuous flow, coupled with sidestream P removal by draining out anaerobic P-bearing wastewater. The process has advanced synchronization of P and N removal and sludge reduction. The improved performance is closely associated with the population structure of P-accumulating organisms (PAOs) . This study investigated the relationship between P removal performance and the population structure of PAOs . The results show that the average effluent P content of HA-A/A-MCO process was only 0.44 mg/L, when the influent P concentration was 8∼12 mg/L. The effluent met the A standard set by GB18918-2002. PAOs were able to effectively release 1 mg of P and absorb 2.8 mg of P. The system removed P by draining out anaerobic P-rich wastewater, as P had been reduced in the aerobic absorption process. This reduced the need for excess P uptake ability of the PAOs . The bacterial pure culture method was applied to isolate 5 PAOs with typical P absorption and removel features. 16SrDNA amplification and sequence analysis revealed that Acinetobacter sp . and Lampropedia sp played dominant roles in anaerobic P-releasing process. Moreover, Devosia sp . and Bdellovibrio sp were the primary strains in the aerobic tank, and, they were the major stains for P absorption. Uncultured Bacterium and other uncultured strains were detected in the anoxic tank.