Analysis of key points of hazardous waste identification sampling technology

The sources and types of hazardous waste generated in China are very complex, the production of hazardous waste is enormous and continues to grow, and thus standardized environmental management and pollution prevention of hazardous waste face enormous pressure. Hazardous waste identification is an important technical means and key basis for identifying the hazardous characteristics of solid waste and determining the environmental management objects of hazardous waste. Based on the authors' experience in hazardous waste identification and the review work briefing of the published hazardous waste identification reports, it was found that some identification institutions did not fully grasp the sampling technical requirements in Technical Specifications on Identification for Hazardous Waste (HJ 298-2019) during the hazardous waste identification process, and the sampling was not standardized, resulting in inadequate or even incorrect conclusions for hazardous waste identification. Therefore, the sampling technical requirements for determining the sampling objects of wastewater treatment sludge generated in the production process, the sampling objects of solid waste in the storage state, the number of parallel line solid waste samples, the sampling time and frequency of continuous solid waste generation, the sampling time and frequency of intermittent solid waste generation, and the sampling methods of solid waste generated in the production process were analyzed. At the same time, common incorrect sampling methods were provided, so as to provide reference for sampling in the identification process of hazardous waste.