Point "pollution" into "scenery" wisdom pollution control let water clear bank green back to the Yangtze River Delta

"The small cesspool in front of the house, the large cesspool in back of the house, when it comes to summer, flies and mosquitoes fly everywhere, and the stench is so bad that the children at home are reluctant to go out to play, and distant relatives are embarrassed to take them out." Recalling his former living environment, Mr. Liu, a villager from Xiaoliu Village, Pukou District, Nanjing, could not help but "laugh".

This has been a constant worry for local residents. The reporter learned that a large rural area of Pukou District before the existence of rural residential sewage drainage problems. Especially Jiangnan a Meiyu season, almost rain in a few months, the sewage in the home, the rain in the sky all have no place to row, the front of the house after the waste water flow, out of the door clothes and shoes to get dirty and smelly.

Today, the scattered open cesspool is gone. After unified treatment, every household in the village has built a new septic tank, set up a kitchen sediment grille well, and installed a water trap to centrally treat sewage through an integrated treatment station. More pleasing is: similar point "dirt" into "scenery" example, has been in the Yangtze River Delta area of Pukou, Jiangyin, Rudong, Liyang and other places to blossom.

Turn "dirt" into "scenery"

"I feel like I live in a park!" After the Pukou pollution control project in Nanjing was officially put into operation, operation and maintenance staff Li Gong met Mr. Liu again when he was doing daily inspection work. Talking about the changes in the living environment, Mr. Liu was beaming from ear to ear.

The Yangtze River Delta, as one of the regions with the most dynamic economy, the highest degree of openness and the strongest innovation ability, is not only the leader of the Yangtze River Economic Belt, but also one of the regions with the most complete agricultural industrial system, the strongest agricultural innovation ability and the most abundant rural business forms in China. In the past, due to the extensive mode of agricultural production, agricultural pollution was discharged at will, which caused a serious burden on the environment.

And now, after scientific treatment, the horizontal flow of sewage disappeared, the smell of the odor is also gone... As the water in the village became colder and fresher, the air became fresher and more garden-like resting places were added.

This visible change is the result of the systematic management of local agricultural pollution, as well as the cross-integration of a number of innovative technologies. The reporter learned from China Construction Water Environmental Protection Co., LTD., the "brilliant hand" behind these changes, that in recent years, the Yangtze River Delta region has gradually built a multilateral linkage system for continuous improvement of rural domestic sewage by using modern management wisdom operation means, and finally formed a systematic solution for local agricultural pollution control, which has become an important attempt to protect "clear water and green mountains" with scientific and technological means.

Nanjing Pukou Pollution Control Project, for example, focuses on the research and development of key technologies and equipment in sewage treatment, facility control and other aspects in order to solve the problem of agricultural pollution in the Yangtze River Delta, and develops a series of key technologies for rural sewage treatment, such as negative pressure suction sewage collection system and MagBR magnetic medium biological reactor. It has formed a technical system of the whole industrial chain and supporting equipment oriented by efficient operation and maintenance.

It is reported that this project, as the first and largest project implemented in the mode of "general contracting + operation" led by the operation unit in China, has created a precedent that the operation and maintenance unit as the leader of the consortium controls the overall design and construction quality.

While committed to scientific and technological innovation, the project also has its own characteristics in operation and maintenance management. Li Gong, the person in charge of operation and maintenance of Nanjing Pukou Project, told reporters that the intelligent agricultural pollution control platform independently developed by the team is based on the monitoring data collection of facilities such as integrated treatment station, purification tank and pumping station, and supported by big data, cloud computing, Internet of Things and distributed control technology, providing strong guarantee and technical support for the all-round, whole-process and whole-cycle operation and maintenance management of agricultural pollution projects.

Now, after the Pukounong project went into operation, it has encountered its first rainy season. Compared to previous years, the village environment has a new change, many villagers encountered operation and maintenance personnel can not help but praise a pass. Li Gong has also become an old acquaintance of everyone, meal time can also harvest a heartfelt thanks to the steamed bread or corn.

Multiple "pipes" together

In terms of precise pollution control, the project team has achieved the "adaptation to local conditions" of sewage treatment through independent innovation of technology and process.

Taking Pukou Project as an example, in the process of implementation, considering the overall situation of rural areas is relatively complex, population size and concentration degree, landform, economic affordability and other aspects are quite different, taking into account the cost performance, construction difficulty and other factors, a variety of treatment modes are adopted to carry out the treatment of rural sewage.

For example, domestic sewage in rural areas close to towns and where conditions permit is connected to urban domestic sewage network; Construction of relatively centralized treatment facilities in densely populated rural areas far from cities and towns; The decentralized treatment mode is adopted in the rural areas where the residents are scattered, the landforms are complex and the population is small.

In the end, the team realized efficient treatment of rural sewage by adapting the treatment mode to local conditions, saving the local government over 200 million yuan in construction costs.

In addition, in the process of sewage treatment, there are also a lot of technological innovation. According to reports, in view of the large ups and downs of sewage outfalls in some villages, the layout along rivers, and the difficulty of collecting conventional gravity pipes, the negative pressure suction sewage collection technology has been developed to realize accurate collection of sewage. Compared with the traditional sewage collection process, the collection pipe of the new process is shallow buried, simple construction, less impact on the current road and damage, no pump lifting in the whole process, saving investment and convenient daily operation and maintenance. At the same time, the whole system is highly airtight, odorless and will not block and leak, which reduces the impact on the surrounding environment and residents' life to the greatest extent during operation.

One of the most eye-catching innovations is the MagBR bioreactor technology developed by the technical team. Based on the mud film mixing process of "A2O activated sludge process + moving bed Biofilm reactor (MBBR)", the technology is an efficient integrated biochemical treatment equipment with simultaneous nitrogen and phosphorus removal functions, with magnetic loading technology to improve the magnetization of MBBR suspended fillers as the core.

"After the sewage is treated, the water quality of the effluent reaches the pollutant discharge standard of the urban sewage treatment plant, Grade A, which can be used as green watering, road flushing and other daily miscellaneous water." Project leader said.

Both "inside" and "outside"

Now, driving slowly on the famous Internet celebrity "Highway No. 1" in Liyang, Jiangsu Province, you can feel the beautiful scenery on both sides of the road. The river is crystal clear, and the flowers are singing beside your ears. No one ever thought, the former rural "sewage pool" after the transformation of scientific and technological means, unexpectedly gorgeous into the public to enjoy the scenery, leisure play "agricultural pollution park", become a beautiful scenery line in the countryside of south China.

In addition to technical challenges, the team has its own "philosophy" of pollution control. They believe that the agricultural pollution treatment project should not only pay attention to the internal elements such as regional layout, treatment methods, technology improvement, energy reduction and energy reduction, but also pay attention to strengthen the green landscape construction of the agricultural pollution terminal, help improve the rural living environment and promote the development of rural tourism. The concept of "internal and external repair" makes sewage treatment more humanized.

It is understood that up to now, in Liyang, Jiangyin, Pukou, Rudong and other places in the Yangtze River Delta region, there have been 37 towns, 3095 villages of more than 250,000 farmers benefit from domestic sewage treatment projects.

Since the implementation of the project, the length of rural pipe network has reached 9,007 kilometers, which is equivalent to three round trips between Beijing and Shanghai. Project investment of more than 6 billion yuan, sewage treatment design total scale of 76,000 tons/day. The practice of the project has promoted the scientific and technological progress in sewage treatment. At present, 18 national patents have been declared, including 2 patents for invention, 3 papers have been published, and 3 local and industry standards have been compiled.

Innovation-driven development. The progress of science and technology has provided an inexhaustible driving force in the process of promoting high-quality development of the national economy and realizing a better life for the people. The beautiful scenery of water towns in the South of the Yangtze River Delta, where "clean water surrounds people's homes", will return to the vast rural land in the Yangtze River Delta and create a beautiful homeland with blue sky, clean land and clear water for more people.

Article source: People.com.cn