Biochemical sludge (BS), generated in the waste water treatment of paper mills, was pretreated by enzyme hydrolysis. The effect and action mechanism of the enzymatic treatment on the properties of polyvinyl chloride (PVC) matrix composites with BS were discussed. Results showed that when the filler content was 30 wt%, the tensile strength of the PVC composites filled with BS and its modified products which were pretreated by laccase, cellulase and hemicellulase can be increased by 38.64, 67.4, 63.5 and 66.3% than the PVC composite filled with calcium carbonate. When the dosage of filler was 40 wt%, the elastic modulus of PVC composites filled with BS and its above three modified products decreased by 53.3, 52.3, 50.0 and 46.3%, respectively. Meanwhile, the thermal stability of PVC composites can also be improved at the temperature of over 340 °C. It can be concluded that the enzyme pretreatment can improve the application performance of BS usage in PVC matrix composites.
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The authors are grateful for the financial support by the funding from the key research project of Shaanxi Province [2017SF-382], the State Key Laboratory of Pulp and Papermaking Engineering of South China University of Technology  and the Doctoral Scientific Research Foundation of Shaanxi University of Science & Technology in China [2016BJ-31].
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1.Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, College of Bioresources Chemical and Materials EngineeringShaanxi University of Science & TechnologyXi’anChina
2.The State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouChina