Effects of injection of acetic acid and propionic acid for total phosphorus removal at high temperature in enhanced biological phosphorus removal process.
In summer, wastewater treatment plant total phosphorus (TP) removal efficiency is low in South Korea. The reason is because of high temperatures or significant fluctuation of inflow characteristics caused by frequent rainfall. Hence, this study tried to raise TP removal efficiency by injecting fixed external carbon sources in real sewage. Polyphosphate accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs) compete to occupy microorganisms at high temperature. Propionate is known to restrain GAOs. Thus, acetate and propionate were chosen as the external carbon source in this study to find out the suitable volume and ratio of carbon source which ensured the dominance of PAOs. An external carbon source was supplied in the anaerobic reactor of the biological phosphorus removal process at high temperature (above 25 °C). TP removal efficiency was improved by injecting an external carbon source compared to that without an external carbon source. Also, it remained relatively stable when injecting an external carbon source, despite the variation in temperature. TP removal efficiency was the highest when injecting acetate and propionate in the proportion of 2:1 (total concentration as chemical oxygen demand (COD) is 12 mg/L in influent).
Department of Environment Engineering, Kyungpook National University, Sangyeok 3-dong, Buk-gu, Daegu, South Korea 702-701 E-mail: chery1008@nate.com.
C Y
CY
Ki
Department of Environment Engineering, Kyungpook National University, Sangyeok 3-dong, Buk-gu, Daegu, South Korea 702-701 E-mail: chery1008@nate.com.
K H
KH
Kwon
Department of Environment Engineering, Kyungpook National University, Sangyeok 3-dong, Buk-gu, Daegu, South Korea 702-701 E-mail: chery1008@nate.com.
S W
SW
Kim
Department of Environment Engineering, Kyungpook National University, Sangyeok 3-dong, Buk-gu, Daegu, South Korea 702-701 E-mail: chery1008@nate.com.
K S
KS
Min
Daegu Metropolitan City Environmental Installations Corporation, 499-4, Dusan-dong, Suseong-gu, Daegu, South Korea 706-801.
T U
TU
Lee
SSENG Co., LTD, 392-7, Deokpo 2-dong, Sasang-gu, Busan, South Korea 617-814.
D J
DJ
Park
D019342:Acetic Acid / Q000737:chemistry*; D000332:Aerobiosis; D000693:Anaerobiosis; D019149:Bioreactors; D006358:Hot Temperature; D010758:Phosphorus / Q000737:chemistry*; D010865:Pilot Projects; D011422:Propionates / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry
D011422:Propionates; D014874:Water Pollutants, Chemical; D010758:Phosphorus; C029658:propionic acid; D019342:Acetic Acid