DECREASING THE LOAD OF BLEACHING EFFLUENT BY USING A NEW ALKALI SOURCE IN ALKALI PEROXIDE PROCESS
One of the great problems in the bleaching of high yield pulps has been the heavy COD (Chemical Oxygen Demand) load in the bleaching effluent. The replacement of conventional alkali source with a new alkali substance has been investigated, here. Three levels of Mg(OH)2 was substituted for three of NaOH in peroxide bleaching of CMP (Chemi-Mechanical Pulping) pulp. This replacement caused to decrease the load of COD and conductivity in bleaching effluent. Results have indicated that the load of effluent increased by bleaching chemicals growth, but the increasing in chemicals percentage had an improving effect on optical and physical properties of pulp. In Mg(OH)2 bleaching processes, alkali consumption rise had less effect on the increasing in load of bleaching effluent than conventional process. The residual peroxide of Mg(OH)2 bleaching process, in filtered liquor after pulp bleaching, was higher than it’s NaOH bleaching process. Also, the residual peroxide levels increased by bleaching chemicals growth.
Bleaching Alkali source Peroxide effluent Residual peroxide
Farhad Zeinaly Jalal Shakhes Alireza Shakeri Nooshin Zeinaly
Department of Wood & Paper Science Faculty of Faculty of Forest and Wood Technology,Gorgan Universit Department of Wood & Paper Science Faculty of Faculty of Forest and Wood Technology, Gorgan Universi Department of Chemistry,Faculty of sciences,Golestan University,Gorgan, Iran Department of Chemistry,Islamic Azad University,Gorgan Branch, Gorgan, Iran
国际会议
International Mechanical Pulping Conference 2011(2011国际机械浆学术会议)
西安
英文
271-274
2011-06-26（万方平台首次上网日期，不代表论文的发表时间）