Abstract
In this study, it was investigated the effect intermittent aeration and step-feed on nitrogen removal
 by providing anoxic-aerobic, anoxic-aerobic-anoxic-aerobic and step-feed anoxic-aerobic-anoxicaerobic working conditions. Chemical oxygen demand (COD) removal efficiency was the same in
 all three working conditions and was found to be 91%. The NH4
 +
 -N removal efficiency is almost
 the same. The NH4
 +
 -N removal efficiencies in the W1, W2 and W3 are 92%, 93% and 95%,
 respectively. Total inorganic nitrogen (TIN) removal efficiency increased by 4% when intermittent
 aeration was applied. Increasing the efficiency of TIN removal by 24% was achieved by applying
 the step-feed intermittent aeration. Experimental results show that the effect of intermittent aeration
 on TIN removal was limited and that TIN removal performance with step-feed intermittent aeration
 was significantly increased.
Highlights
Biological nitrogen removal in sequencing batch reactor is realized by providing alternative aerobic and anoxic conditions (Zhong et al, 2013)
The aim of this study is to evaluate the effects of each strategy on the nitrogen removal performance by applying separately the intermittent aeration and together the intermittent aeration with the step feed in the sequencing batch reactor
In another study comparing the performance of sequencing batch reactor and intermittent aeration sequencing batch reactor, 11 % more nitrogen removal was achieved in intermittent aeration sequencing batch reactor (Pan et al, 2013)
Summary
Biological nitrogen removal in sequencing batch reactor is realized by providing alternative aerobic and anoxic conditions (Zhong et al, 2013). Due to the inadequacy of carbon source in nitrogen removal with nitrification and denitrification processes, the denitrification. The intermittent aeration strategy, in which the aeration and non-aeration phases are alternately repeated in order to create aerobic and anoxic conditions, is used to increase the nitrogen removal from the wastewater (Lim et al, 2012). Step-feed strategy is a method that provides more effective and efficient use of carbon source for denitrification in activated sludge system (Zhong et al, 2013). In the step-feed strategy, the influent is fed into the reactor at the beginning of anoxic phases where denitrification takes place by dividing by equal or certain proportions (Chen et al, 2013)
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