間欠浸水ろ床法による廃水の生物的処理

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Wastewater treatment by microbial slime grown on a solid surface was studied.A vessel packed with plastic plates to which the microbial slime is attached is filled with water, and subsequently the water is withdrawn from the vessel. By repeating the above cycle the slime is supplied nutrients from water when submerged, and oxygen from air when drained. This process was named intermittent submerged biooxidation.Two vessels of similar geometry, 5l in working volume with a total of about 0.5m^2 in microbial slime surface, were used in this study. Wastewater treatment was couducted in batches (24hr). Water was transferred from one vessel to the other and recycled to the first at intervals of 15min. The efficiencies of COD removal were above 90%, provided the COD loads were less than 21g/m^2/day. This result was comparable to that obtained from a laboratory-scale rotary disk biooxidater.One vessel of the intermittent submerged biooxidater was used for the measurement of oxygen uptake rate of microbial slime in air. The drained vessel was closed with a lid, and the air inside the vessel (5.9l) was circulated at 1.3 l/min. The oxygen content of the air, which decreased through the respiration of the slime, was measured with a membrane-type oxygen sensor. The rate of oxygen uptake was 22.2g/m^2/day.Both values of oxygen absorption rate, COD removal and respiration in air, were about three times larger than the nonbiological oxygen absorption of the same apparatus measured by the sulfide oxidation method, 7.4g/m^2/day. This fact implies that the microbial slime sustained in air absorbs oxygen more rapidly than a nonbiological wet surface in air.From the above results, the intermittent submerged biooxidater seems promising for small-scale wastewater treatment.
公益社団法人日本生物工学会の論文
1978-03-25

間欠浸水ろ床法による廃水の生物的処理

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