廢紙酵素脫墨之研究

Studies on the Enzymatic Deinking of Wastepaper

蘇裕昌(Yu-Chang Su) ； 趙善源(Shan-Yuan Chiou) ； 李淑靜(Shu-Ching Lee) ； 葉若鋆(Ruoh-Yun Yeh)

《台灣林業科學》 17卷4期 (2002/12) Pp. 439-449

https://doi.org/10.7075/TJFS.200212.0439

摘要

本研究以纖維素分解酵素、半纖維素分解酵素、前述兩者之混合酵素及脂肪分解酵素對回收新聞廢紙及影印廢紙進行酵素脫墨試驗，比較與傳統脫墨法之脫墨效率以及脫墨漿物理特性，確立酵素脫墨法之理想流程，並探討回收報紙及影印紙脫墨的酵素種類、酵素脫墨漿之應用及酵素脫墨漿之各項性質，以建立兩種廢紙酵素脫墨法。新聞廢紙的酵素脫墨在酵素處理後只需洗滌處理即可獲良好的脫墨效果，但影印廢紙的酵素脫墨必須配合洗滌及浮選處理，才可達到理想的脫墨效果。酵素處理時間即添加酵素後之散漿時間之長短影響再生漿白度的下降及強度的變化，在30 min時可發揮最佳脫墨效果及綜合紙力。在酵素處理影印紙時，再生漿得率、強度等隨酵素添加量有下降之趨勢，雖不同酵素有不同之理想添加量，其有效應用範圍各酵素可能應用量約1.0 units/g paper左右，即每克紙漿使用1單位酵素活性之酵素。但理想使用量仍需以試驗驗證。影印廢紙利用多種酵素配合處理，二次浮選等處理可改善脫墨酵素效率及紙性。爲了提昇影印廢紙之脫墨效率可利用鹼浸漬處理改善纖維膨潤之處理性，且可促進脫墨效率提昇到99%以上並改善紙張性質。

關鍵字

廢紙脫墨 ； 酵素脫墨 ； 脫墨漿性質 ； 纖維素分解酵素 ； 半纖維素分解酵素 ； 油脂分解酵素

並列摘要

The aim of this paper was to establish a deinking method for old newsprint and xerographic paper using commercially available cellolytic and hemicellolytic enzymes, or their mixtures and lipase. Comparis ons of deinking efficiencies between conventional and enzymatic deinking was made for these was tepapers. The optimal deinking process was established by evaluating the physical properties of the resulting pulps and the ink removal efficiencies.
For old newsprint, deinking efficiency and deinked pulp with acceptable properties could be obtained from a single-stage washing deinking after enzymatic treatments. Forold xerographic paper, enzymatic deinking with both washing and floatation was needed. Increases in enzymatic treatment time in the pulper resulted in pulp brightness loss and strength reduction. A 30-min. treatment time led to high deinking efficiency and strength. Increasing the enzyme dosage in the pulper resulted in better ink speck removal efficiency, but overdosage caused pulpyield loss and pulp strength reduction. Even though different enzymes had their own optimal dosages, a reasonable dosage was about 1 unit of enzyme activity pergram of paper substance.
In order to develop better ink removal efficiencies, various treatments were tried including multiple enzyme addition, secondary flotation, and alkaline presoaking before enzymatic treatment. The results showed great improvements in ink removal efficiency. Results of the alkaline presoaking treatment in dicate that alkali improved the wettability and swelling of the fiber surfaces and achieved ink removal efficiencies of 99% or higher. Moreover, the characteristics of the resulting pulps were also improved.

並列關鍵字

deinking ； enzymatic deinking ； properties of deinked pulp ； cellulose ； hemicellulase ； lipase