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KMID : 0380020070220020102
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Korean Journal of Biotechnology and Bioengineering
2007 Volume.22 No. 2 p.102 ~ p.108
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Vertical Flow Zeolite-Filled Reed Bed with Intermittent Feeding for Sewage Treatment
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Seo Jeoung-Yoon
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Abstract
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A sewage was treated using a vertical flow zeolite-filled reed bed. The sewage from the student dormitory of Changwon National University was fed into the reed bed for 10 minutes every 6 hours at the hydraulic load of 314 L/㎡·day. The filtering height of the reed bed was 100 ㎝ and the zeolite mixture was filled in the reed bed. The mixture consisted of the same volume of two types of zeolite ; 0.5~1 ㎜ and 1~3 ㎜ in diameter. Annual average removal efficiency was SS 89.9%, CODCr 86.1%, CODMn 81.2%, T-N 34.0%, NH4+-N 97.3% and T-P 34.6%. T-N of effluent was mostly NO3--N and the concentration of NO2--N in effluent was lower than 0.1 mg/L. All removal efficiencies did not show a remarkable seasonal change. The ranking of phosphorous fractions fixed to the zeolite in column test was Ca-P 〉Fe-P 〉reductant soluble Fe-P 〉occluded P 〉saloid P 〉Al-P at all depths of the filter. All phosphorous fractions except for Al-P reduced at deeper filter layer, while their content ratios increased at deeper filter layer. Organic matter content was the highest at the highest layer (0~5 ㎝ from the top of the filter) and only small differences were observed at the deeper filter layer than 5 ㎝ from the top. Organic matter content increased at all depths of the filter with the operating time.
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KEYWORD
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Vertical flow, zeolite reed bed, sewage treatment, intermittent feeding
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