UASB型リアクターによるパン酵母培養廃水の処理特性

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The long-term stable anaerobic treatment system at high organic loading rates for molasses wastewater has been investigated. Especially, the effectiveness of pretreatment, in which the molasses wastewater was evaporated under reduced pressure, has been evaluated. Furthermore, the competition between methane producing bacteria and sulfate reducing bacteria has been investigated.A UASB reactor with an effective volume of 10m3 was used.SO42- and K+ concentrations in the molasses, which at high level have inhibitory effects on an anaerobic treatment, could he reduced to 80% or more by the pretreatment. Owing to the pretreatment, the treatment perfommance was excellent with 60-70% removal of CODcr and 90% or more removal of BOD at the CODcr loading rate as high as 25-30 kg·m-3·d-1,The vial activity test results show that the methane producing activity is highly affected by the operating CODcr loading rates of the reactor. The methane producing activity, operating at CODcr loading rates of 10kg·m-3·d-1, has been compared with that of 28kg·m-3·d-1 rates, and a 2.4 times activity increase has been observed.Of the total removed CODcr, 94% had been used in the methane producing reaction and 4% in the sulfide producing reaction. Of the total electron flow, 92% was utilized by methane producing bacteria and 8% by sulfate reducing bacteria. It has been revealed that i) the methane producing reaction was actively undertaken, ii) the sulfide level in the reactor had hardly any inhibitory effects on the methne producing reaction, and iii) there was hardly any competition between methane producing bacteria and sulfate reducing bacteria.
社団法人　日本水環境学会の論文
1995-05-10

UASB型リアクターによるパン酵母培養廃水の処理特性

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