What does solid waste mean?

Solid waste contains the following contents:

Solid waste refers to solid, semi-solid and gaseous articles and substances in containers that have lost their original use value or have not lost their use value, as well as articles and substances that are included in waste management according to laws and administrative regulations. Liquid wastes that cannot be discharged into water bodies and gaseous substances that cannot be discharged into the atmosphere when placed in containers. Because of its great harm, most of them are classified as solid waste management systems.