热磨机械浆废水的化学特性及其甲烷发酵

<正>对一种针叶材TMP废水的化学特性进行了研究,结果表明:该项废水的COD>5000毫克/升,总碳水化合物含量为3.207毫克/升,组成以己糖为主占80％,戊糖量少,并含有一定数量的游离还元糖。其总固物和挥发性总固物等和草浆板废水相似,悬固物很少。甲烷发酵试验表明,该废水适于厌氧处理。甲烷发酵主要条件是体积COD负荷 6—7公斤/米~3天,温度34—36℃,部分回流,滞留时间24小时左右。在此条件下COD除去率可达80％左右,甲烷占所产气体的80％以上。

CHARACTERISTICS OF THERMOMECHANICAL PULPING (TMP) EFFLUENTS AND THEIR BIOLOGICAL TREATMENT TO YIELD METHANE

The study on characteristics of thermomechanial pulping effluents indicates that the contents of COD and total carbohydrates in this effluents are more than 5000mg/1 and 3000mg/1 respectively and that hexose are dominant constituents and that free sugars are present in significant amounts. The contents of total solid and total volatile solid are similar to those in the composition of a machine effluent from a strawboard mill, while the solid content in TMP white water is rather low. A high percentage reduction in COD (about 80 percent) was obtained in an anaerobic flow system with a partial recycle flow under the conditions of an organic loading of 6-7kg/m3d in terms of COD, a retention time of 24 hours, and a temperature of 34-36°C. The content of CH4 in the biogas is more than 80%.