In recent years, Guangzhou has made great efforts to build new environmental protection infrastructure of buried ecological sewage treatment plant, effectively complemented the short board of urban sewage treatment capacity, achieved significant improvement in economic, environmental and social benefits in sewage treatment and recycling, and promoted Guangzhou to become an advanced city in water environmental protection industry with the largest scale of buried sewage treatment, the most advanced technology integration and the most beautiful model in China. Taking into account both function and beauty, the sewage treatment plant turns into a citizen's back garden The process of "ecological sewage treatment" will not be transferred to the depth of 17 meters underground, and all the odor will not be discharged through the "ecological sewage treatment" process. The artificial wetland and greening landscape on the ground can not only collect and purify rainwater, improve the surrounding air humidity and alleviate the urban heat island effect, but also integrate with the surrounding environment to form an aesthetic garden landscape. This design of "building factories underground and parks on the ground" has "upgraded" the traditional sewage treatment plant, changed people's traditional understanding of the image of "poor environment and heavy smell" of the water purification plant in the past, and realized "four zeros" in the construction process, including zero complaints, zero petitions, Zero construction obstruction and zero negative public opinion of surrounding residents, which has set a model for the efficient promotion of environmental protection and ecological projects such as follow-up similar sewage treatment. Reporters in Shijing water purification plant, Lijiao water purification plant and other park water purification plants saw that the greening and wetland area in the plant exceeded 50% of the ground area. A good ecological environment helps to alleviate the regional heat island effect and enrich the biodiversity of the plant and surrounding areas. Shijing water purification plant is built with the whole ecological design concept, the overall greening rate is greater than 50%, and a large garden landscape park is built on the ground. Lijiao water purification plant is located in the south of Guangzhou and is connected with Guangzhou Haizhu wetland, a national wetland. The advanced process is adopted in the phase III treatment process of the water purification plant to improve the effluent quality, greatly strengthen the sewage treatment effect, and the environmental index is better than the national standard. Intensive and economical land use can effectively revitalize the value of land The construction of ecological water purification plant in Guangzhou adopts buried design and intensive layout. Dozens of processes with different functions are grouped and integrated into six rectangular modules, such as pretreatment area, sludge area, biochemical area and membrane area. The staggered high-rise buildings are stacked in two underground spaces. Different structures share walls and equipment. Driving passages, maintenance passages and comprehensive pipe corridors are arranged in the middle, and a small number of auxiliary buildings are built on the ground, It has greatly improved land use efficiency, saved underground space, released ground resources, and left open space for cities and people. Since the first buried water purification plant in South China was built in Guangzhou in 2010, 14 buried (semi buried) sewage treatment plants have been built in Guangzhou, with a total treatment scale of 2.04 million tons / day. The buried sewage treatment scale has reached the first in China, saving land by 30% - 50% compared with similar processes and conventional surface sewage treatment plants of the same scale, effectively solving the shortage of land resources in environmental protection industry. Sanhua water purification plant of Daling River located in Huadu District makes rational use of the land in the river embankment on the east side of Tianma River, the underground treatment facility box is located under the forest, and the business building is located in the construction land on the north side. The site selection of Sanhua water purification plant combined with river embankment solves the problem of difficult site selection of sewage treatment plant, and provides a case demonstration for the implementation of site selection of sewage treatment plants at home and abroad. High standard completion of sewage treatment helps Guangzhou "long-term system and long-term cleaning" The buried water purification plant is equipped with a relatively complete reclaimed water recycling system. After sewage treatment and purification, ecological water replenishment can realize the recycling of water resources. "The high standard effluent meets the reclaimed water standard, and the rainwater collected and purified by ecological vegetation can be recycled for ecological water replenishment, greening and cleaning in river waters." Yao Hanzhong, Secretary of the Party group and director of Guangzhou Water Affairs Bureau, introduced that at present, the main rivers in Guangzhou urban area can get sufficient make-up water from the water purification plants along the line every day. In 2021, the annual reclaimed water reuse amount of each water purification plant in the central urban area of Guangzhou is about 590 million tons, and the reclaimed water reuse rate is 39%. The total construction scale of Huashan water purification plant in Huadu District has reached 170000 m/ d. The sludge treatment system is designed as 70000 m/ D. the sludge produced by the sewage treatment capacity shall be treated, and the effluent index shall be in accordance with the stricter of class IV water in the environmental quality standard for surface water and class I a standard in the pollutant discharge standard for urban sewage treatment plant. After lifting, the tail water is discharged to tonggukeng River on the east side of the plot, and part of the tail water can be used as landscape make-up water for the upper landscape park. In addition, Shijing River is outside Shijing water purification plant in Baiyun District. Due to the large population density, insufficient sewage treatment capacity, imperfect sewage interception and other reasons, Shijing River is black and smelly all the year round, which is criticized by the surrounding people. It is also a "hard nail" that must be pulled out in Guangzhou's water control work. With the successive operation of Shijing water purification plant phase II and other water purification plants, Shijing River has long been separated from the ranks of black and smelly rivers. "People's cities are built by the people, and people's cities are for the people. Building a new ecology, urban renewal and development presents a new pattern of harmony between man and water. The underground sewage treatment plant reflects the harmony between man and nature, and it is also a concrete embodiment of taking the people as the center," said Yao Hanzhong, party secretary and director of Guangzhou Water Affairs Bureau. (Xinhua News Agency)