Final answer:
The disposal of sewage or other liquid waste can utilize systems like pressure flow or vacuum systems, with sewage treatment being vital for protecting water quality and public health through multiple stages at wastewater treatment facilities.
Step-by-step explanation:
The disposal of sewage or other liquid wastes can be performed by various systems, including pressure flow and vacuum systems. Sewage treatment is crucial for protecting water quality and public health. Wastewater treatment facilities process sewage in multiple steps to remove contaminants and return treated water to the environment or for reuse.
Stages of Wastewater Treatment
- Pretreatment: This includes screening and the removal of sand and gravel.
- Primary Treatment: This step involves settling or floatation to remove organic solids, fats, and grease.
- Secondary Treatment: Aerobic bacterial decomposition of organic solids happens here.
- Tertiary Treatment: This includes bacterial decomposition of nutrients and further filtration.
- Disinfection: Methods such as chlorination or ultraviolet light are used to kill microbes.
Once the treatment is complete, the wastewater can be discharged to surface waters or used for irrigation or other purposes. Modern sewage systems and treatment plants are essential for maintaining a sustainable environment and public health, especially in urban areas.