Abstract

John Leju Celestino Ladu^1,2, Ting Ting Wei¹ , Xiwu Lu¹ * and Meiling Zhang¹

This study examined the removal of nitrogen from domestic wastewater through the application of anoxic/oxic (A/O) bio-reactor system. Influent and effluent samples were collected from the system and tested. Chemical oxygen demand (COD), NH4 +-N and NO3 - -N were analyzed. Different hydraulic retention time (HRT) and recycle ratios were applied to assess its influence on removal efficiency of the reactor. The temperature was controlled between 20 to 24o C and pH was 7.7 – 8.2. The result revealed average COD removal efficiencies of 72.1%, average removal of NH4 +-N and NO3 - -N was 92% and 54% respectively. The result obtained reflects that, the A/O reactor is suitable and efficient in nitrogen removal.

Domestic wastewater; anoxic/oxic (A/O) bio-reactor system; Hydraulic retention time (HRT); Recycle ratios; Nitrification; denitrification

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