**2. Application of heterogeneous catalysts in dechlorination**

Recent years, the scientific community and the engineering technical community have begun- to pay more attention to the CPs degradation or removal. In order to achieve this goal, large- numbers of methods have been employed, such as oxidation (Fenton, O3 and so on), aerobic/ anaerobic biodegradation [4, 5], photocatalytic degradation [6], thermal combustion, catalytic reaction based on polymer membrane [7] and reduction dechlorination. In the chapter of this book, we classified these methods into two major categories: oxidation and reduction reactions in- **Table 1**. In order to give the readers a clear understanding of the processing methods of the entire CPs treatments, we generally explain each method briefly. Because of heterogeneous catalysis is- a cost-effective method for CPs treatments. We will give a detailed explanation and summary.-
