With the acceleration of society, industrialization and urbanization, the problem of water pollution has become increasingly serious, which has become one of the important factors restricting sustainable development. As a key link of environmental protection, sewage treatment plays an irreplaceable role in improving water quality and maintaining ecological balance. Its unique environmental protection attribute not only helps to alleviate the shortage of water resources, but also provides a solid technical support for the construction of beautiful China.

I. Purifying water sources and protecting the environment

Sewage often contains a large number of harmful substances such as organic matter, heavy metal ions and various pathogenic microorganisms. Direct discharge will cause great damage to surface water bodies, and then affect human health and the safety of natural ecosystems. Through scientific and reasonable treatment process, these pollutants can be effectively removed, and the effluent can meet the national discharge standards or reuse requirements, thus reducing the pressure on the environment and promoting the harmonious coexistence between man and nature.

Second, the recycling of resources to achieve circular economy

Modern sewage treatment technology is not limited to simple "decontamination", but is developing in a more efficient and economical direction-that is, extracting useful components from wastewater for reuse. For example, the anaerobic digestion process can generate biogas for energy supply; Reverse osmosis can concentrate salt to prepare industrial raw materials; The excess sludge produced by activated sludge process can be used as fertilizer to supplement soil nutrients after drying. This not only reduces the cost of waste disposal, but also injects new vitality into economic and social development.

Third, promote scientific and technological progress and help green development

With the continuous improvement of science and technology, new achievements in new materials, bioengineering and other fields have been widely used in sewage treatment industry, greatly improving the treatment efficiency and service quality. For example, the application of membrane separation technology makes the refractory organic matter effectively decomposed; The intelligent control system realizes the accurate monitoring and regulation of the whole process. These innovative measures not only meet the needs of current economic and social development, but also show China's determination and wisdom to take the road of ecological civilization.

To sum up, sewage treatment has remarkable environmental protection properties and is an indispensable part of realizing green and low-carbon transformation. Facing the historical mission entrusted by the new era, we must adhere to the innovation-driven development strategy, strengthen international cooperation and exchanges, constantly improve the technical level of sewage treatment, and jointly protect every drop of clear water on this blue planet.