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%.