FURTHER UNDERSTANDING ON COD AND ITS MEASUREMENT DURING PEROXIDE BLEACHING OF A TMP
In this paper, we studied the effect of substitution of Mg(OH)2 for NaOH in peroxide bleaching of TMP on COD in the bleaching effluent. Furthermore, different methods for pre-treating effluent samples were determined. The results showed that with the increased substitution of Mg(OH)2 for NaOH, the COd decreases significantly. The mixing intensity during H2O2 bleaching also affected COD. A stronger mixing can cause an increase in COD, especially for the NaOH-based process. Effluent samples obtained by directly filtrating through the bleached pulp mat can be used for COD testing. It is not necessary to further filter them through filter paper and to kill the residual H2O2 in the sample. The residual H2O2 in the sample has no effect on COD results, even if the amount of residual H2O2 is very high. Therefore, the sample preparation for COD testing can be simplified.
COD Mg(OH)2 NaOH bleaching
Hu Huiren Zhang Hongjie Ni Yonghao
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300 Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300 Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, N.B., E3B 6C2, Canada
国际会议
广州
英文
731-735
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）