The journey of purifying a drop of sewage in the environment

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A trip to purify a drop of sewage

—— Observation from the front line of Yangtze River Protection

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

In early summer, fish are swimming in the gurgling stream in Guangyang Island, Chongqing, and dragonflies are flying in the background of flowers.

This ecological island in the middle of the Yangtze River, the largest area in the upper reaches of the Yangtze River, was seriously degraded by over-exploitation before the Yangtze River was protected. Today, a Bayu pastoral landscape painting is slowly unfolding in Guangyang Island.

*** pay attention to big protection, not big 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 for pipe networks, and turned sewage treatment plants into resource factories to innovate 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.

Over 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 the great protection of 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 affiliated to 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.

When the water consumption increases during holidays, the "Water Butler" issues a water transfer instruction and calls the nearby waterworks for "reinforcement" to relieve the water supply pressure; At the same time, the "water housekeeper" will estimate the displacement according to the water consumption. If it exceeds the sewage treatment capacity of the area, it will direct the sewage to other sewage treatment plants to ensure the healthy "metabolism" of the city. In case of rain, the "water steward" will quickly generate a precipitation model, predict the most prone water accumulation area according to the surface water flow direction, make a plan in advance, turn on the corresponding drainage pump, and "unscrew" the river drainage valve in the city to free up the storage capacity and avoid waterlogging.

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

As of April, more than 1 kilometers of rain and sewage pipe network has been built in Lu 'an, and 111 residential areas have completed the transformation of rain and sewage diversion, and the water environment is undergoing a turning point-in three years, the centralized collection rate of urban domestic sewage has increased from 44.8% to 67.72%; The sewage treatment capacity has increased from 185, tons/day to 415, tons/day; All 14 black and odorous water bodies have been rectified and passed the re-verification number of 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 between plants and networks, and "fragmentation and fragmentation" of industrial chain, "we have signed cooperation agreements with 23 cities and counties along the Yangtze River, and registered" Water Butler "companies in Lu 'an, Yueyang, Yichang, Xiantao, Jiujiang and Wuhu, with the following objectives: Wang Dianchang, Party Secretary and Chairman of Changjiang Environmental Protection Group, said.

pollution is in the water, the root is 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 it is 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 treatment of urban water environment with emphasis on the pipe network, and invest 7% of the investment related to the protection of the Yangtze River in the construction of the factory network." Wang Dianchang said.

a drop of sewage flows into the sewage treatment plant, where the turbidity is transformed into clear water.

In the suburb of Yixing in the lower reaches of the Yangtze River, there is an avant-garde architectural complex, with small ponds and cafes hidden by green plants and flowers. The air is fresh, birds and flowers are fragrant, and people 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 plants and cities, expand the traditional sewage treatment plants from the basic function of pollutant reduction to various application scenarios such as urban energy, water source and fertilizer plants, convey the concept that "sewage is a resource, and sewage plants are resource factories", integrate ecology, life and production, eliminate the "neighborhood effect" and create a new urban space that is open and accessible. Zhang Yifei, chairman of China Holding Water Co., Ltd., introduced and opened a bottle of "sustainable water" produced by the water plant to quench his thirst.

"water quality is sustainable, energy is self-sufficient, resources are recycled, and environment is friendly". Yixing Conceptual Water Plant interprets this operation target with a set of data-producing 2, cubic meters of reclaimed water, 8, cubic meters of biogas, 23 tons of organic fertilizer and 18, kWh of electricity every day. At the same time, the dried biogas residue is used for landscaping and brick-making soil, which demonstrates the "water magic" of turning sewage into resources and sludge into flowers.

"The sewage treatment plant is also a laboratory, where there is a water purification center with a capacity of 2, tons/day, a collaborative organic matter treatment center with a capacity of 1 tons/day and a production-oriented R&D 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 professor at the School of Environment and Civil Engineering of Jiangnan University, who is a member of the Yixing Concept Waterworks Expert Committee, said.

At present, the Three Gorges Group has invested about 95 billion yuan in the Yangtze River Protection, and 325 sewage plants have been put into operation. The sewage treatment scale is 4.26 million cubic meters per day, and the length of the construction and transportation network is 18, kilometers. The black and odorous water bodies within the cooperation scope of the pilot cities have been completely eliminated, and the outstanding ecological problems in the cooperation area have been basically eliminated.