Abstract
The performance of a typical sequencing batch reactor (SBR) for removing various nitrogen loadings was investigated in this study. The typical cycle of SBR consisted of filling of 5 min, aerating of 3 h, non-aerating of 4 h, settling of 1 h and decanting of 5 min (HRT was approximately 24 h). The results showed that the nitrogen removal efficiency was gradually increasing from ∼ 36% at the low NH4-N of 10 mg/L to ∼ 50% at the higher NH4-N of 20 mg/L and reached to the maximal efficiency of 82% at the highest concentration of 40 mg/L. This is due to the increasing NH4-N and nitrogen removal rates which were 6.0 and 5.5 mg/L⋅h at the best reactor performance. Moreover, the high specific nitrogen removal rate of 20.5 mg N/g MLVSS.h was found and the most effective carbon consumption of 2.4 mg C/mg N was obtained during the experiment.
Highlights
Since nitrogen has become a key factor for water pollution from eutrophication and oxygen depletion, the stringent environmental regulations are carried out to decrease the nitrogen discharge
The reduction of total nitrogen including NH4-N, NO2-N and NO3-N in the reactor operating under no air supply and excess acetate was used to refer to the nitrogen removal rate
The NH4-N was approximately 6.8 mg/L was found in the effluent, while no NO2-N and NO3-N was observed (Table 1)
Summary
Since nitrogen has become a key factor for water pollution from eutrophication and oxygen depletion, the stringent environmental regulations are carried out to decrease the nitrogen discharge. The high nitrogen of 40-70 mg/L was found in the household and sewage wastewater, which mainly contain ammonium-nitrogen (NH4-N) [2,3]. Some industries such as dairy and tannery generate the high nitrogen wastewater in the range of 50-500 mg NH4-N/L [4,5]. The effluent from treatment system is one of significant sources for nitrogen wastewater discharge; the landfill leachate contained 250-600 mg NH4-N/L [6] and the anaerobic digestion effluent contained 710 mg NH4-N/L [7]. To maintain the good quality of water resource, the treatment technology is required to reduce the nitrogen contamination to be the acceptable level
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