1. technical name

High temperature dry heat treatment technology for medical waste.

2. scope of application

Disinfection and treatment of medical waste.

3. technical content

3.1 technical principle

Medical waste is first crushed by a crushing and grinding device, and then the heat released by the ultra-high temperature heat transfer oil is transferred to the crushed medical waste through the inner wall of the sterilizer. The maximum temperature can reach 200 ° C; the whole process does not add water or steam, and the crushed material is heated at high temperature to achieve sterilization and disinfection of medical waste. The dry heating process uses a higher temperature than that of a steam device, and the processing time is shorter.

The system disinfection temperature is 170℃~ 210℃, the disinfection time is 20 minutes, the stirring speed is 21r/min, and the internal pressure of the disinfection tank during disinfection is 4200Pa~ 4600Pa.

3.2 main innovations

(1) The control system adopts a self-developed control integrated module, with high equipment integration, and the equipment is fully automated and digitally operated to achieve efficient operation.

(2) The log value of microbial killing is greater than 6.00, and the microbial inactivation efficiency is greater than 99.9999%, which can completely solve the problems of high equipment and operating costs and dioxin emission of non-incineration technologies.

(3) Adopt a conical jacketed heating chamber with a wall-scraping stirring device and a discharge advancing device inside as the main sterilization equipment, and adopt PLC intelligent control to ensure that medical waste is evenly heated in the heating chamber, and the heating temperature is controlled at 170℃~ 210℃ range. Compared with the traditional high-temperature cooking process, the heating temperature is increased and the heating time is shortened, thereby improving the sterilization effect and work efficiency.

4. Pollution control or environmental restoration effects

The concentrations of particulate matter, VOCs, hydrogen chloride and other indicators are far lower than the requirements of the "Pollution Control Standards for Medical Waste Treatment and Disposal"(GB39707-2020) for medical waste. The disinfection effect indicates that the logarithmic killing value of bacteria is> 6.00, and the measured value of chlorine is less than 0.03mg/m3. No dioxins are produced during disposal.

5. Technology demonstration

The project disposal capacity of Harbin City Medical Waste Disposal Center is 70t/d. The high-temperature dry heat process is divided into medical waste treatment system, air extraction + gas purification system, heating system and automatic control system. This project effectively kills propagule bacteria, fungi, lipophilic/hydrophilic viruses, parasites and mycobacteria, and Bacillus subtilis var. niger spores. PM2.5, VOCs, odors, particulate matter, hydrogen chloride, chlorine, etc. The concentration of pollutants meets the requirements of corresponding emission standards, and neither mercury nor its compounds are detected.

6. investment estimation

Taking the construction of 40t/d high-temperature dry heat treatment equipment and ancillary facilities as an example, the total investment is 100.35 million yuan, including 70.02 million yuan in fixed assets investment and 46.04 million yuan in equipment purchase cost.

7. investment recovery period

Taking the construction of 40t/d high-temperature dry heat treatment equipment and ancillary production and environmental protection facilities as an example, the payback period is 7.5 years.

8. Prospects for transformation and promotion of technological achievements

This technology has been used in Liaoning Province, Heilongjiang Province, Jiangsu Province, Jiangxi Province, Shanxi Province and other places. It is expected that the company's output value will reach 1.5 billion yuan in 2025, with a market share of nearly 30%, and broad promotion prospects.