With the development of social economy and the acceleration of urbanization, the influence of human beings on the environment is becoming more and more obvious, especially the pollution of water resources is becoming more and more serious. As an important part of environmental protection, sewage treatment technology plays an irreplaceable role in maintaining water health and promoting sustainable development.

I. Status quo and challenges

At present, China's urban domestic sewage discharge is huge, industrial wastewater treatment facilities are not perfect, and it is difficult to control agricultural non-point source pollution. According to relevant data, about 70% of urban rivers in China are polluted to varying degrees, and nearly 90% of urban groundwater is threatened by pollution. These pollutants include not only conventional indicators such as organic matter and ammonia nitrogen, but also new pollutants such as heavy metals and persistent organic pollutants (POPs), which enter the water environment through various channels, causing serious environmental pollution and ecological damage.

Second, the significance of sewage treatment

1. Protect human health: Pathogenic microorganisms and harmful substances contained in untreated or improperly treated sewage will directly endanger human health; The clean water discharged after effective purification can reduce the risk of disease transmission.

2. Maintain ecosystem balance: Rational use of reclaimed water for agriculture and forestry irrigation, landscape water replenishment and other activities can reduce the pressure on natural water sources and protect biodiversity.

3. Promote economic development: Clean and safe water quality is one of the prerequisites for attracting investment and improving the quality of life of residents, and it can also create favorable conditions for fisheries, tourism and other industries.

Third, the future direction

Facing the grim situation, the state has introduced a series of policies and measures to strengthen the prevention and control of water pollution, promote industrial upgrading and transformation, and improve resource utilization. Specifically:

-Strengthening the construction of laws and regulations and strictly implementing emission standards;

-Encourage technological innovation and promote efficient and low-consumption sewage treatment processes;

-Establish and improve the market mechanism and guide social capital to participate in environmental protection;

-Strengthen public education and publicity to enhance the awareness of water conservation in the whole society;

In a word, sewage treatment is a systematic project, which requires the joint efforts of the government, enterprises and the public to achieve practical results. We should look at this problem with a scientific attitude, actively seek solutions and jointly protect our blue homeland.