廃水処理過程におけるクラフトパルプ漂白廃水成分の挙動

概要

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Major components in spent chlorination liquor of kraft pulp are consisted of the aliphatic acids : oxalic acid, dichloromaleic acid, chloromaleic acid, chlorofumaric acid, etc. Most of them are originated from lignin in pulp. The behavior of their acids during flocculation, activated sludge and adsorbent processes was investigated. The results are as follows : 1) The removal of aliphatic acids by flocculation (Al2(SO4)3) was over the range from 0 to 80%. These depend upon the stability of a chelate complex formed by an aliphatic acid and aluminum sulphate as a flocculant. 2) By the use of activated sludge, aliphatic acids were biologically degraded through TCA cycle except dichloromaleic acid, trichloroacetic acid and oxalic acid. In an activated sludge process, dichloromaleic acid and trichloroacetic acid were not removed from solution, but oxalic acid was removed to the extent of 50%. The removal of oxalic acid may be due to the flocculation of activated sludge. 3) Low molecular weight organic acids as chloro-aliphatic acids were hardly removed from solution by adsorbents.
紙パルプ技術協会の論文