Degradation Mechanism of Kraft Pulp Wastewater with Ozone and Microbial Degradation of Organic Acids Produced.

Abstract

クラフトパルプ排水中に含まれるリグニンの効率的分解のためにオゾン分解後に微生物分解する処理方法を提案した。リグニン芳香核の分解に及ぼすpH, 温度などのオゾン分解条件の影響を実験的に明らかにした。オゾン分解によってリグニン芳香核はムコン酸, マレイン酸, シュウ酸などの種々の低分子有機酸に分解された。シュウ酸分解菌A28菌を用いたオゾン分解液の微生物分解では, 菌の増殖は酢酸を消費した後にシュウ酸を分解する典型的なジオキシ増殖を示した。結果として, オゾン分解と微生物分解から成る処理方法はクラフトパルプ排水中のリグニンの完全分解のための効果的方法であることがわかった。 The efficient degradation of lignin in kraft pulp wastewater by ozonolysis and microbial degradation was presented. The effects of operational conditions such as pH and temperature on the degradation of lignin aromatic ring by ozone were experimentally clarified. The lignin aromatic ring was degraded by the ozonolysis into various low-molecular weight organic acids such as muconic acid, malefic acid, and oxalic acid. In the microbial degradation of ozonolyzed wastewater using an oxalic acid degrading microorganism, strain A28, cells grew in a typical diauxic growth, i.e. the oxalic acid was degraded only after the exhaustion of acetic acid. As a result, it was found that after ozonolysis of kraft pulp wastewater microbial degradation by strain A28 was effective method for the complete degradation of lignin in it