The organic solvent lignin in this paper was extracted from the scrap liquid of the reed ethanol pulping. The attained lignin was characterized by Scanning Electron Microscope（SEM）.On this basis，the lignin is blended with PVC and other auxiliaries, PVC/lignin composite material is prepared by pressure molding. The mechanical performance index of PVC/lignin composite material is detected and the impact fracture morphology of the PVC/lignin composite material is observed by SEM photograph. According to the research, it is indicted that the lignin and PVC has a certain degree of compatibility. The less dosage of lignin, the better compatibility lignin and PVC performances. With the increasing of dosage of lignin, the impact strength, tensile strength and bend strength of PVC/lignin composite material decrease. Compared with 5 phr PVC/lignin composite material, the dispersed phase diameter of the impact fracture morphology of 20 phr PVC/lignin composite material becomes bigger, and the uniformity of distribution becomes worse.

In this study, the reed pulping medium wastewater was treated by the membrane bioreactor. The purpose of the study is to determine the operating conditions to the operation of internal membrane bioreactor for the treatment of reed pulping medium wastewater. The volume of the bioreactor is 15 litre in which develops an adapted biomass. The reed pulping medium wastewater was pumped from an influent trough into the bioreactor and a level sensor and a submerged pump were installed to adjust the water volume in the bioreactor. In the bioreactor the effluent separated from the activated sludge by the hollow fiber membrane module. The experimental have shown that the average rate of elimination of the COD is of 91.3%.The removal ratio of the Color reach 87.5%. The rate of elimination of the TSS is 90.2%.

The degradation rules of glycan in reed ethanol/water cooking process were studied. The degradation rules of polydextrose and polyxylose were obtained in the cooking process by means of ion chromatography determination of glucose and xylose in the reed ethanol pulp content under different holding time. Results showed that cellulose (polydextrose) removal rate obviously was divided into two stages, rapid removal stage at the holding time of 0-90min and slow removal stage at the holding time of 90-210min; hemicellulose (xylan) removal rate was also divided into two stages, slow removal stage at the holding time of 0-60 min and rapid removal stage at the holding time from 60min until the end; meanwhile the change rules of lignin and ash content were achieved.

Ethanol pulping is a kind of solvent pulping technology. The utilization of lignin in waste liquor can reduce pollution and increase high value of product. The lignin in the waste liquor could be isolated by adding water in the system after standing for several hours and purified by enzymatic and acidic hydrolysis two-step procedure. Results showed that the optimized purification conditions are as follows, enzyme dosage is 0.004g/g (to oven dry lignin), enzymatic buffer pH is 5, enzymatic hydrolysis temperature is 30°C, and hydrochloric acid concentration of acid hydrolysis is 0.055mol/L. The lignin purity is 91.61%, and the yield is 81.89%.

This article studied the pulp contrast of reed three-stage counter-current cooking and single-stage cooking, meanwhile analyzed the regulation of the yield , the hardness of pulps and the properties of the waste liquor from each cooking stage of reed three-stage counter-current batch cooking with ethanol-water process. The SEM and IR-FT were employed to gain more understanding on the change of lignin on fiber surface and the structural change of lignin separated from waste liquor of each stage. The results show that single-stage cooking need to keep 190°C for 4.0 hours to get the best results, while the three-stage counter-current cooking need 1.5 hours more, but the highest temperature fallen by 20°C and the screened pulp yield increased by 3.9%, also the Kappa number decreased by 11. In the process of reed three-stage counter-current batch cooking with ethanol-water, the degradation and removal of lignin and glycan occurs mainly in the first stage. After the first stage cooking, most fibroblasts did not reach the fiber separation point and the screened pulp yield is only 38.7%. After the second and third stage cooking, the fiber separation became better ,the screened pulp yield increased to 49.72% and the Kappa number decreased to 25.6 . As the analysis of the results from the each-stages lignin by IR-FT, the structure of lignin had no significant difference .