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Author:

Zeng, W. (Zeng, W..) (Scholars:曾薇) | Li, L. (Li, L..) | Yang, Y.-Y. (Yang, Y.-Y..) | Zhang, Y. (Zhang, Y..) (Scholars:张勇) | Peng, Y.-Z. (Peng, Y.-Z..) (Scholars:彭永臻)

Indexed by:

Scopus PKU CSCD

Abstract:

At normal temperature, short-cut nitrification and denitrification was achieved in a lab-scale A2O process treating low C/N ratio domestic wastewater by controlling DO concentration of 0.3-0.5 mg/L and increasing the internal reflux ratio to decrease the actual aerobic HRT. However, the phosphorus removal in A2O process was deteriorated with the increasing of the nitrite concentration in the effluent. The factors causing phosphorus removal deterioration, such as the influent COD concentrations, temperature, pH and free nitrous acid (FNA) were systematically analyzed. Experimental results showed that the nitrite accumulation resulting from short-cut nitrification affected anaerobic P release and aerobic P uptake. Especially, the higher FNA concentration (HNO2-N 0.002-0.003 mg/L) in the aerobic zone significantly inhibited the aerobic P uptake, which was the major reason causing P removal deterioration. Through adding the carbon sources in influent to enhance anaerobic P release and denitrification, the nitrite and FNA concentrations in the aerobic zone were decreased, and the P removal was recovered. More than 96% of PO43--P could be removed in A2O process.

Keyword:

A2O process; Domestic wastewater; Nitrite; Phosphorus removal; Short-cut nitrification and denitrification

Author Community:

  • [ 1 ] [Zeng, W.]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 2 ] [Li, L.]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 3 ] [Yang, Y.-Y.]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 4 ] [Zhang, Y.]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 5 ] [Peng, Y.-Z.]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Reprint Author's Address:

  • 彭永臻

    [Peng, Y.-Z.]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

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Source :

Environmental Science

ISSN: 0250-3301

Year: 2010

Issue: 9

Volume: 31

Page: 2105-2112

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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