Water is the source of life, and the development of human civilization cannot be separated from the support of boiled water resources. However, with the rapid development of social economy and the surge of population, the discharge of industrial, agricultural and domestic sewage is increasing year by year, which brings unprecedented pressure to the water supply environment. According to statistics, about 80% of untreated or substandard wastewater in the world is directly discharged into natural water bodies, which seriously threatens human health and ecosystem balance. Therefore, it is particularly important to discuss sewage treatment from the perspective of environmental protection.

First, the significance of sewage treatment

　　From the perspective of environmental protection, scientific and reasonable sewage treatment can effectively reduce the pollution of rivers and lakes and other water bodies and protect the safety of drinking water; At the same time, some valuable resources, such as organic matter, nitrogen and phosphorus, can be recycled to achieve the goal of circular economy. In addition, by reducing greenhouse gas emissions, it will contribute to climate change.

Second, the main challenges currently facing

1. Technical problem: The composition of sewage from different sources is complex and changeable, and how to effectively remove harmful substances from it has become one of the technical bottlenecks.

2. Shortage of funds: The construction and operation of sewage treatment facilities need a lot of capital investment, especially in developing countries and regions, and financial support is limited.

3. Lagging laws and regulations: Some areas lack perfect laws and regulations to regulate sewage discharge behavior, and the supervision is not strong enough.

4. Weak public awareness: Some people have insufficient understanding of the importance of water saving and emission reduction, and their participation is not high.

Third, solutions and suggestions

1. Popularize advanced and applicable technologies: encourage scientific research institutions to cooperate with enterprises to develop new high-efficiency and low-consumption treatment technologies, and gradually popularize and apply them.

2. Strengthen policy support: The government should introduce more preferential policies to attract social capital into this field and increase the proportion of public investment.

3. Improve relevant legal systems: establish and improve comprehensive sewage management laws and regulations, clarify the responsibilities and obligations of all parties, and strengthen law enforcement inspection.

4. Improve the environmental literacy of the whole people: carry out diversified publicity and education activities to enhance the environmental protection awareness of all sectors of society, especially the younger generation.

To sum up, in the face of the increasingly severe water crisis, we must establish a correct concept, take practical measures to strengthen sewage treatment, and jointly protect our beautiful home. This is not only a manifestation of being responsible for the present generation, but also a manifestation of being responsible for future generations.