Abstract
Abstract Supercritical water oxidation (SCWO) technology has a great potential application for the disposal of liquid hazardous wastes. The feeding process is vital for the safety and normal operation of SCWO. This paper describes the feeding preparation strategy of SCWO with multilevel grouping and programming. Based on the physicochemical properties, the liquid hazardous wastes from various industrial manufacturers were first grouped into acid, neutral and alkaline groups. By mixing between samples, the primary grouping tanks were determined to be acid, alkali, amphoteric reacting, organic and organic high-chlorine liquid wastes. By distributing acid, alkali, amphoteric reacting liquid wastes into organic wastes, three parallel feeding routes are regulated for the homogenizing tank phase, which avoids the reaction between wastes. By calculating with the linear programming optimization model of MATLAB, the waste compatibility ratio of each feeding route was determined to meet the feeding requirements of SCWO. The feeding preparation strategy of this paper provides a practical instruction for the SCWO design and operation.
Highlights
Hazardous waste liquor, which is identified based on the National Catalogue of Hazardous Wastes (NCHWs, hazardous waste list in China) (Ministry of Environmental Protection of the People’s Republic of China ) or standards (Ministry of Ecology and Environment of the People’s Republic of China ), usually has one or more hazardous characteristics, such as corrosiveness, toxicity, flammability, reactivity and infectivity
The feeding preparation strategy of this paper provides a practical instruction for the Supercritical water oxidation (SCWO)
The samples have been classified into acid, neutral and alkaline groups based on the pH value for the primary storage tanks
Summary
Hazardous waste liquor, which is identified based on the National Catalogue of Hazardous Wastes (NCHWs, hazardous waste list in China) (Ministry of Environmental Protection of the People’s Republic of China ) or standards (Ministry of Ecology and Environment of the People’s Republic of China ), usually has one or more hazardous characteristics, such as corrosiveness, toxicity, flammability, reactivity and infectivity. A total of seven important parameters of pH, particle size, salt content, P, Cl, N and calorific value were analyzed based on their physicochemical properties, the same group hazardous wastes will be mixed for further storage. The mixing scheme of liquid wastes from primary tanks should be designed based on the compatible mixing regulations, and the feasibility of the process route must be verified by experiments. In the primary storage tank stage, raw liquid hazardous wastes were grouped into acid, alkaline, organics and specific wastes based on their physicochemical properties. The intermixing experiment of liquid hazardous wastes was carried out to judge the compatibility between the same group samples to see if they could be put into the same storage tanks. After determining the feeding route based on compatible mixing regulations, the mixing experiment was carried out to test the compatibility of materials from different primary tanks by flask test. The linear programming algorithm was applied to determine the mixing portion of wastes from various primary tanks by calculating the ingredients of wastes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
