The Core Objectives of Sewage Treatment
Sewage treatment aims to remove pollutants in sewage through physical, chemical and biological methods, so that it meets discharge standards or realizes resource utilization. Its core objectives include:
Prevent water pollution: Avoid eutrophication, hypoxia and ecological damage caused by organic matter, pathogens, nitrogen and phosphorus in sewage.
Protect the ecological environment: Maintain aquatic biodiversity and ensure the health of wetlands, forests and other ecosystems.
Resource recovery and reuse: Treated sewage can be used for agricultural irrigation, industrial water or landscape replenishment, and sludge can be converted into fertilizer or energy.
Comply with laws and regulations: Meet national and local environmental standards and avoid facing penalties for illegal discharge.
Promote sustainable development: Achieve coordinated development of economy and environment by reducing pollution and recycling resources.
two, sewage treatment technology classification and typical process
sewage treatment technology according to the principle can be divided into physical, chemical and biological three categories, often used in combination in practical applications.
physical treatment method
precipitation: the use of gravity to separate suspended solids in sewage, such as sand sedimentation tank, sedimentation tank.
screening: through the grid, micro filter and other large particles of suspended solids.
air flotation: injection of micro bubbles into sewage, so that the density close to the water particles attached to the bubble floating, suitable for the removal of emulsified oil and other pollutants.
centrifugal and swirling separation: the use of centrifugal force to separate suspended solids or emulsified oil in sewage.