Sludge is a solid deposit produced by water and sewage treatment. Housing and Construction Bureau is the organization that guides the administrative supervision and environmental protection of the construction industry in the city, that is, environmental protection work. Environmental protection is an act of protecting the natural environment at the level of individuals, organizations or governments for the well-being of nature and human beings. Due to the development of industry, the environmental pollution problem is too serious, which has destroyed the ecological environment, and some even reached an irreparable level, causing industrialized countries to pay attention to the environment.