With the rapid development of society, industrialization and urbanization, water pollution is becoming more and more serious, which not only affects people's quality of life, but also causes irreversible damage to the ecological environment. Therefore, making and implementing an effective sewage treatment scheme has become one of the important measures to achieve sustainable development. This paper will discuss how to design and implement an efficient sewage treatment scheme under the guidance of environmental protection plan.

1. The importance of sewage treatment

Sewage contains a large number of pollutants, such as organic matter, heavy metals and pathogenic microorganisms. If it is discharged directly without treatment, it will seriously destroy the ecological balance of natural water bodies and threaten human health. Through scientific and reasonable sewage treatment technology, these harmful substances can be effectively removed, the pressure on the environment can be reduced, and at the same time, water resources can be recycled to promote the harmonious coexistence of economy and environment.

2. The sewage treatment target in the environmental protection plan

Reduce pollutant discharge: ensure that the treated water quality meets the national or local emission standards.

Improve the utilization rate of resources: recycle resources by recycling reusable components such as nitrogen, phosphorus and potassium in sewage.

Protect the ecosystem: prevent aquatic life death and soil degradation caused by sewage discharge.

Enhance public participation: enhance the awareness and support of all sectors of society for environmental protection awareness.

3. Implementation steps and methods

(1) pretreatment stage

Pretreatment is mainly to remove large particles and other impurities that are easy to block the subsequent treatment facilities. Common methods include grid interception, grit chamber sedimentation, etc.

(2) Biological treatment process

Biological method is the most widely used sewage treatment technology at present, which uses the metabolism of microorganisms to decompose organic matter in sewage. Activated sludge process and biofilm process are all mature biological treatment methods.

(3) Chemical and physical treatment

When certain types of pollutants are difficult to be biodegraded, chemical or physical means are needed to further purify the water. Such as coagulation and sedimentation, activated carbon adsorption, reverse osmosis, etc.

(4) later advanced treatment

In order to meet the requirements of higher standards or special purposes (such as recycling), it is necessary to go through advanced treatment, which may involve the application of advanced technologies such as ultraviolet disinfection and ozone oxidation.

4. Conclusion

To sum up, it is a systematic project to build a perfect sewage treatment system under the framework of environmental protection plan, which involves policy support, technological innovation and social cooperation. Only with the joint efforts of all parties can we truly realize the effective treatment of sewage and leave a better home for future generations.