The long-term effect of initial pH control on the enrichment culture of phosphorus- and glycogen-accumulating organisms with a mixture of propionic and acetic acids as carbon sources |
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| Institution: | 1. Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment & Safety Engineering, Fuzhou University, Fuzhou 350108, China;2. Fujian Haixia Environmental Protection Group Co. LTD, Fuzhou 350003, China;3. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;1. SPC “Armbiotechnology” of the National Academy of Sciences of Armenia, Department of Microbiology, 14 Gyurjyan Str., 0056 Yerevan, Armenia;2. Cyprus University of Technology, Department of Environmental Science and Technology, 95 Eirinis Str., P.O. BOX 50329, 3603 Limassol, Cyprus;3. Sewerage Board of Limassol – Amathus (SBLA), Franklin Rousvelt 76, Building Α, P.O. Box 50622, 3608 Limassol, Cyprus;4. Department of Energy Engineering, Gyeongnam National University of Science and Technology (GNTECH), 33 Dongjin-ro, Jinju, Gyeongnam, South Korea;1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;2. National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou 215009, China;3. Qizi Mountain Sanitary Landfill Plant of Suzhou, Suzhou Environmental Sanitation Administration Agency, Suzhou 215009, China;1. Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. João Dagnone, 1100 – Jd. Santa Angelina, CEP 13563-120 São Carlos, SP, Brazil;2. Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235 CEP 13565-905 São Carlos, SP, Brazil |
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| Abstract: | In most studies on phosphorus- and glycogen-accumulating organisms (PAO and GAO), pH was controlled constantly throughout the entire anaerobic and aerobic periods, and acetic acid was used as the carbon source. In this paper, the effect of long-term initial pH values on PAO and GAO was investigated with mixed propionic and acetic acids as carbon sources. It was observed that with pH increasing from 6.4 to 8.0, the anaerobic propionic acid uptake rate by PAO linearly increased but that by GAO proportionally decreased. At pH 6.70 and pH 7.51, PAO and GAO exhibited the same acetic and propionic acid uptake rates, respectively. The acetic acid uptake rate by PAO was greater than that by GAO at pH > 6.70, and the propionic acid uptake rate by PAO was higher than that by GAO at pH > 7.51, which indicated that PAO would take predominance over GAO at pH > 7.51. Poly-3-hydroxybutyrate, poly-3-hydroxyvalerate and poly-3-hydroxy-2-methylvalerate shared 7%, 62% and 31%, respectively in the PAO system, and 11%, 44% and 45% respectively in the GAO system, and these fractions were observed independent of pH either in the PAO or in the GAO system. In the PAO system, with the increase of pH, the phosphorus removal efficiency was improved greatly, and a phosphorus removal efficiency of 100% was achieved at 8.0. Further investigation showed that the higher phosphorus removal efficiency at higher pH was mainly caused by a biological effect instead of chemical one. |
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