Silica gel production is high water consumption industry and silica gel wastewater has always been a key source of pollution in the field of industrial production.

Study on EPDM/activator-modified waste silicone rubber blend;

The present market of sodium metasilicate pentahydrate was outlined, and then the experimental technique of preparing sodium metasilicate pentahydrate from the waste silica gel was introduced.

Study on the treatment of pectin wastewater by composite flocculant;

The technical scheme for the treatment of pectin wastewater is put forward by using lime as neutralizer isput forward, survival Al(Ⅲ) and PAM as coagulant, slag and active carbon as deconlouriser is put forward in this paper.