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A journey to purify a drop of sewage

-observation from the front line of Yangtze river protection

Xinhua News Agency Beijing reporter recorded a trip to purify a drop of sewage and observed it from the front line of Yangtze River protection.

In the early summer in Yangguang, Chongqing, fish swim in the gurgling stream, and dragonflies fly against the background of flowers.

The largest ecological island in the upper reaches of the Yangtze River was seriously degraded due to over-exploitation before the Yangtze River was protected. Today, a Bayu pastoral landscape painting is slowly unfolding in Yangguang Island.

* * * attaches great importance to protection and does not engage in large-scale development. In recent years, around the theme of ecological priority and green development, many cities along the Yangtze River have explored urban smart water stewards, launched a tough battle of pipe network, turned sewage treatment plants into resource factories, and innovated urban sewage treatment. According to the latest data from the Ministry of Ecology and Environment, the national control section of the main stream of the Yangtze River has reached Grade II water quality for three consecutive years. The mother river of the Yangtze River is full of vitality.

In the past few days, reporters have traveled down the Yangtze River, went deep into relevant provinces and cities, and felt the scientific and technological content of protecting the Yangtze River through a trip to purify a drop of sewage.

In Lu 'an, Anhui Province, the centralized control center of Lu 'an Water Butler Company, a Yangtze River Environmental Protection Group under the Three Gorges Group, marked the "journey" of a drop of sewage in the city with the constantly beating data on the big screen of the intelligent control system.

Whenever the water consumption increases on holidays, the "water housekeeper" will issue a water transfer instruction and call the nearby waterworks to "reinforce" to ease the pressure on water supply; At the same time, the "water housekeeper" will estimate the displacement according to the water consumption. If it exceeds the sewage treatment capacity of this area, it will lead the sewage to other sewage treatment plants to ensure the healthy "metabolism" of the city. When it rains, the "Water Butler" will quickly generate a precipitation model, predict the area that is most prone to water accumulation according to the direction of surface water flow, make a plan in advance, turn on the corresponding drainage pump, and "unscrew" the river drainage valve in the city to vacate the storage capacity and avoid waterlogging.

"We learn from the way of managing the power system to manage urban sewage, and promote the city to realize the integration of water supply and drainage, the linkage between factories and networks, and rebuild the urban water system through' one network', and change the fragmented governance into integrated and precise water control." Huang Rongmin, executive general manager of Anhui Regional Company of Changjiang Environmental Protection Group, said.

As of April, Lu 'an has built a rain and sewage pipe network 100 kilometers, and completed the transformation of rain and sewage diversion in1/residential quarters. The water environment is turning-in three years, the centralized collection rate of urban domestic sewage has increased from 44.8% to 67.72%; The sewage treatment capacity is increased from 6.5438+0.85 million tons/day to 4.65438+0.5 million tons/day; 14 All the black and odorous water bodies have been rectified and re-checked by the Ministry of Housing and Urban-Rural Development, and 22 waterlogging points have been rectified.

In view of the problems existing in cities along the Yangtze River, such as low sewage collection rate, backward infrastructure such as pipe network, inefficient operation of sewage treatment plants, separation of factories and networks, and fragmentation of industrial chain, "we signed cooperation agreements with 23 cities and counties along the Yangtze River, and registered" water housekeeper "companies in Lu 'an, Yueyang, Yichang, Xiantao, Jiujiang and Wuhu, with the goal of" one city ",secretary of the Party Committee and secretary of the Yangtze River Environmental Protection Group.

Pollution is in the water, rooted on the shore, and the key lies in the pipe network. Only when the pipe network is healthy can the rivers and lakes be healthy. Qu Jiuhui, an academician of China Academy of Engineering, said that the pipe network is the artery of the city, an important infrastructure and "lifeline" for the operation of the city, and also a key link and outstanding problem for improving the quality and efficiency of urban sewage treatment. Systematic pollution control thinking is the focus of * * * to grasp the great protection of the Yangtze River.

"We aim at the pipe network, the short board of urban sewage treatment, and implement the comprehensive management of urban water environment with the focus on the pipe network, and use 70% of the investment related to the protection of the Yangtze River for the construction of the factory network." Wang Dianchang said.

The sewage drops flow into the sewage treatment plant, where they change from turbid to clear.

On the outskirts of Yixing in the lower reaches of the Yangtze River, there is an avant-garde building complex with small ponds and cafes hidden by green plants and flowers. The air is fresh, birds are singing and flowers are fragrant. Citizens come here for a walk from time to time. This is not a city park, but the first concept factory of urban sewage resources in China.

We try to reinterpret the relationship between sewage treatment plants and cities, expand the basic functions of traditional sewage treatment plants from pollutant emission reduction to urban energy, water sources, fertilizer plants and other application scenarios, convey the concept that "sewage is a resource and sewage treatment plants are resource factories", integrate ecology, life and production, eliminate the "neighborhood effect" and create an open and barrier-free new urban space. Zhang Yifei, chairman of China Holding Water Co., Ltd., introduced and opened a bottle of "sustainable water" produced by the water plant to quench thirst.

"Sustainable water quality, energy self-sufficiency, resource recycling and environmental friendliness". Yixing Conceptual Water Plant interprets this operation target with a set of data-producing 20,000 cubic meters of reclaimed water, 8,000 cubic meters of biogas, 23 tons of organic fertilizer and10.8 million kWh per day. At the same time, the dried biogas residue is used for landscaping and brick-making soil, which shows the "water magic" of turning sewage into resources and sludge into flowers.

"The sewage treatment plant is also a laboratory. It has a 20,000-ton/day water purification center, a 100-ton/day organic cooperative treatment center and a production research and development center. Here, the cutting-edge technology of the laboratory can also be directly applied to real scenes to promote the transformation of scientific and technological achievements. " Li Ji, a member of the Expert Committee of Yixing Conceptual Waterworks and a professor at the School of Environment and Civil Engineering of Jiangnan University, said.

At present, the Three Gorges Group has invested about 95 billion yuan in Yangtze River protection, and 325 sewage treatment plants have been put into operation. The sewage treatment scale is 4.26 million cubic meters per day, and the length of the transportation network is 6.5438+0.8 million kilometers. Black and odorous water bodies were completely eliminated within the cooperation scope of pilot cities, and outstanding ecological problems in the cooperation zone were basically eliminated.