自己排除型ダイナミック膜法による未さらしクラフトパルプ洗浄廃水の処理

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  • Treatment of Unbleached Kraft Pulp Washing Waste Water by Self-Rejecting Dynamic Membrane
  • ジコ ハイジョガタ ダイナミック マク ホウ ニヨル ミ サラシ クラフト パ

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Unbleached kraft pulp-washing waste water forms a self-rejecting membrane dynamically on a porous support when the waste water is circulated under pressure through the support. Hyperfiltration property of the self-rejecting dynamic membrane was studied using a flow cell and a batch cell at 40 kgf/cm2, 25°C. Because the dissolved lignin in the feed waste water was aggregated in the acidic range, membrane formation and treatment of the feed waste should be performed at pH values outside this range. In the case of feed waste containing NaCl, solutes rejection decreased. By proper selection of conditions, the rejection of TOC, lignin and colored matter and electric conductivity could be maintained for at least 70 hours above 93%, 98.5%, 99% and 80% respectively. Under the same conditions the water flux declined from 4.5 m3/m2·day to 1.3 m3/m2·day. However, the water flux was restored to 85% of that at the initial stage by membrane regeneration.<BR>Furthermore, concentration testing was conducted until 80.3% water recovery was achieved. At this time, total recovery of TOC and lignin reached about 83% and 97% respectively. The quality of permeate water at 80.3% water recovery was comparable to that of low-pressure reverse osmosis testing.

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