10 recommendations on hazardous waste reduction

1

Strengthen production management, strictly control the storage and use of raw and auxiliary materials, and reduce the waste of raw and auxiliary materials and the waste generated by the expiration of raw and auxiliary materials. For example, the packaging specifications of purchased chemicals should be minimized to reduce the amount of disposal of expired chemicals.

02

Eliminate backward production technology and optimize production technology. For example, the Paint slag comes from the over-painted mist which has not effectively formed the coating film. Starting from the angle of improving the adhesion rate of the paint, adopting the spraying process with high transmission efficiency can control and reduce the amount of paint slag from the source. The spraying transmission efficiency of electrostatic atomization, electrostatic Rotary Cup atomization and electrostatic disc atomization is about 1-1.3 times higher than that of traditional air spraying and paint-free spraying.

03

For various kinds of waste organic solvents, including benzene, ether, Ester and so on, which are produced in the production process of chemical, petrochemical, pharmaceutical and other enterprises, if there is recycling value, the enterprise can build a recycling treatment device for organic solvents, thus reducing the processing capacity of waste organic solvents. Common organic solvent recycling treatment devices include extractive distillation devices, which utilize organic matter to separate organic matters with different utilization value at different saturated vapor pressures at different temperatures to realize the resource utilization of hazardous wastes.

04

For chemical, petrochemical and other enterprises, a large number of distillation residues will be generated in the production process. For this kind of high-concentration organic waste liquid, due to its high calorific value, enterprises can build RTO, RCO, waste liquid incinerator and other devices to process the distillation residues by themselves, which can avoid the risks in the process of hazardous waste transportation.

05

For raw and auxiliary materials which are required in the production process of chemical industry, petrochemical industry and other enterprises, the material packaging barrel is a relatively large source of hazardous waste, and storage tank storage can be used instead of packaging barrel storage. In addition, the structure of the raw material packaging barrel can be optimized, and the lining is added to the packaging barrel. After the raw materials are used, only the lining needs to be treated as hazardous waste, and the outer packaging materials can be recycled, which can reduce the production of hazardous waste packaging barrels.

06

As for the enterprises which involve a large amount of paint in paint production enterprises, general equipment manufacturing industry and special equipment manufacturing industry, the characteristics of enterprise waste gas production are that the concentration of organic waste gas is relatively high. Enterprises can adopt activated carbon adsorption/desorption + catalytic combustion integrated treatment device, or zeolite rotary adsorption + catalytic combustion integrated device, etc. to replace the regular replacement of activated carbon treatment method to reduce the amount of waste activated carbon.

07

For chemical enterprises such as coatings and inks whose products are produced in batches, switching to produce different types of products requires cleaning of equipment containers. For the generated cleaning waste liquid, enterprises can optimize their production management plans. The same type of products should be produced in the same batch as far as possible to reduce the cleaning times of equipment so as to reduce the amount of cleaning waste liquid.

08

For machining enterprises, the generated hazardous waste is mainly waste emulsion, etc. Enterprises can extend the service life of emulsion, reduce the frequency of replacement and reduce the amount of waste cutting fluid produced by adding filtration devices.

09

As for the waste acid or alkali produced in the production process of the enterprise, after being treated by waste water treatment processes such as physical treatment, chemical treatment, physical chemical treatment and biological treatment, it can meet the requirements of relevant regulations and emission standards for discharging to environmental water or municipal sewage pipe network and treatment facilities, and can be treated by waste water treatment facilities to reduce the final production of hazardous waste of the enterprise.

10

For the water content of the dehydrated sludge produced by the wastewater treatment station of the Enterprise factory is relatively high, the enterprise can improve the sludge dewatering device, such as adopting the integrated dehydration and drying device to reduce the water content of the sludge to 50% and reduce the amount of the dehydrated sludge produced by the enterprise.