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Journal of Industrial and Engineering Chemistry, Vol.11, No.6, 971-977, November, 2005
Filtration Performance of Submerged Membrane in a Membrane Coupled Fixed Phase Biofilm Reactor
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This research was carried out a membrane coupled fixed phase biofilm reactor (M-CFPBR) process using a waste lime support carrier to minimize membrane fouling of the membrane bioreactor (MBR) and to improve the removal efficiency of nitrogen and phosphorus in wastewater. Waste lime was pretreated and used as a material for a bead-type support carrier having a rough surface and large pore structure. In this work, we investigated the filtration characteristics of the submerged membrane and the removal efficiency of nutrients according to changes in air flow rate and support carrier volume fraction in the M-CFPBR process using a waste lime support carrier. The filtration time of the membrane increased with increasing the air flow rate under the same support carrier volume fraction. Under the condition that air flow rate was the same, filtration time increased, as the support carrier volume fraction was increased. The change of trans membrane pressure (TMP) with time reached 30 kPa within 160 h when the support carrier was not packed. However, as the support carrier volume fraction was increased from 10 % to 20 % and 30 %, the filtration time of the membrane was extended from 160 h to 280 h and 500 h respectively. The nitrogen removal efficiency was improved because the effective mixed liquor suspended solids (MLSS) concentration and effective solid retention time (SRT) increased within MBR as the support carrier volume fraction increased. Phosphorous removal efficiency was below maintained 10% when the support carrier was not packed, but when the support carrier was packed 10 %, 20 %, and 30 %, it increased 72 %, 85 %, and 89 % respectively. Therefore, the M-CFPBR process minimizes membrane fouling, thereby improving the filtration time and the wastewater treatment efficiency.
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