Pollution Control for Industrial Construction and Demolition Waste in Chemical and Metallurgical Factories

Abstract

Distribution of hazardous substances and their release potential were investigated in industrial construction and demolition waste (ICDW) of several chemical and metallurgical factories. Results showed that inorganic matters like heavy metals, organic matters like pyrethroids exist as a result of industrial pollution, which might pose a potentially serious threat to the nearby surroundings while abandoned. In this study, wash-off coupled with ultrasonic process, immobilization and natural degradation experiments were performed on the simulated ICDW on basis of different pollutants. Up to 65% of Cl was reduced through ultrasonic wave pretreatment. Addition of CaO and construction & demolition waste(C&D) powder inhibited the mobilization of heavy metals with rainfall tremendously, among which Cr and Cu, in particular, was cut by 80-100% in aqueous. Compared with being stacked and abandoned inside the workshop, heat and direct sunlight largely accelerated the degradation of pyrethroids. This study provides a new insight into strategies to the ICDW management, and the achievement of source pollution control as well.