光叶楮白皮生物制浆及漂白废水的特性及处理

Characteristics and Treatment of the Waste Water from Bio-pulping and Bleaching of Broussonetia Papeyrifera L.

光叶楮白皮生物制浆及漂白所产生的废水总量为每吨漂白浆145.5 m3。制浆与漂白段的废水的BOD/COD(B/C)分别为0.38和0.24,可以用生物法处理。用SBR法处理时的最优曝气时间为8 h;最佳初始pH值:制浆混合废水为7.5,漂白混合废水为7.0;处理结果:制浆混合废水CODC r去除率为84.2%,BOD5去除率达到89.6%;漂白混合废水CODC r去除率为78.1%,BOD5去除率达到80.9%。

The total amount of waste water from bio-pulping and bleaching of the white bast of the Guangyechu（Broussonetia Papeyrifera L. ）, a kind of fast growing hard wood in north China, is about 145.49 m^3 per ton of bleached pulp. The BOD/COD of pulping and bleaching waste water is 0.38 and 0.24 respectively, so they are suitable to be treated by biological methods. The optimum aeration time is 8hrs when SBR process is used, the optimum initial pH values of pulping mixed waste water and bleaching mixed waste water are 7.5 and 7.0 respectively, CODcr removal rates are 84.2% and 78. 1%, BOD5 removal rates are 89.6% and 80.9% for the pulping mixed waste water and bleaching mixed waste water respectively.