Ganquanbao Tianyin Textile Park supporting sewage treatment plant project
In the vast Gobi Desert of Xinjiang, poplar trees stand tall in the desert with their tenacious vitality. Equally unyielding is a group of builders who are striving to turn the Ganquanbao Tianyin Textile Park from blueprint to reality.
The supporting sewage treatment plant project of Ganquanbao Tianyin Textile Park is not only the expansion of the company's water business, but also the profound practice of the concept of industrial sustainable development. Since breaking ground in March 2022, the project leader team has risen to the challenge of facing the double test of extreme climate and harsh construction conditions in Xinjiang, overcoming one difficulty after another with innovation and determination.
Hydropower diversion in the Gobi Desert
Ganquanbao Tianyin Textile Park Supporting Sewage Treatment Plant Project is located in Ganquanbao Industrial Park, Urumqi City, 80 kilometers away from Urumqi City. As far as the eye can see, the project can only see the vast Gobi, and the loess reaches the foot of Bogda Peak. The project started in March 2022, and although the contract period is more than 600 days, the actual construction period is only about 400 days considering the climatic conditions in Xinjiang. At the beginning of construction, looking at the wasteland under his feet, Luo Jian, the project manager, was very anxious.
"The temporary construction cannot be delayed, the hydropower problem needs to be solved urgently, we must reverse the construction period and accelerate the progress!" Luo Jian immediately convened a coordination meeting with the management personnel to discuss the construction plan. After the meeting, he immediately set off and led the team to go back and forth to the surrounding areas of the park to conduct field research, and strive to coordinate the problem of water and electricity diversion.
At the same time, Wang Fangshi, the project production manager, and Gao Yunlong, Wang Xuchen, and Hui Pengbo, the foremen, did not stop. When the project was out of water and electricity, they went against the wind and led the team to rush forward the temporary construction to ensure that the temporary construction of the project was completed before the workers officially entered the site.
Wang Fangshi led the team and actively coordinated with the local government and surrounding enterprises. They first transferred temporary water to a rural cooperative 2 kilometers away, and then coordinated with the local government and relevant departments to open a water diversion channel within three days. On the day of opening the water diversion channel, all the staff went into battle to dig the ditch and successfully connected the underground pipe network. In the end, the project successfully solved the water problem through the method of west-to-east water diversion in less than 5 days, and ensured the supply of domestic water for the project.
At the same time, 1 km away from the project, the project team coordinated the connection of high-voltage power lines. Immediately afterwards, the temporary construction facilities were completed within 7 days. Water, electricity, and temporary construction are all in place, and the project construction is on the right track.
Overcome difficulties to ensure performance
As a supporting sewage treatment plant in the industrial park, the construction content of the project should meet the needs of high-end technology. In order to prevent the leakage of chemical wastewater, its quality requirements also exceed those of ordinary sewage treatment facilities. "If you don't take quality and safety as the first standard from the foundation pit, the consequences will be unimaginable. Li Weilong, the technical leader of the project, said.
During the construction of the coarse grid and the inlet pump room, the project design team found that there was a serious discrepancy between the groundwater level line given in the original geological exploration report and the geological exploration report. Under such conditions, it is difficult to drain the groundwater with the well-point precipitation technology designed in the original scheme. If the groundwater problem cannot be solved, it will seriously affect the construction progress of the monomer. Looking at the serious water seepage at the scene, production manager Wang Fangshi frowned.
"We must ensure the safety and quality of construction!" In order to promote the solution of the problem of foundation replacement, Li Weilong led a team to re-investigate the groundwater situation of the project. In addition, he also organized the project technical research team, and successively formulated a number of replacement plans by visiting brother projects and consulting Chinese and foreign academic materials. Under the comprehensive consideration of feasibility and economic benefits, the project finally adopted the method of "open-cut foundation pit + laying large-diameter precipitation pipe". After the method was implemented on site, the foundation pit problem was solved within 8 days, providing an effective boost for the construction of the main project project.
After solving the problem of water seepage in the foundation pit, new problems followed. In order to meet the daily sewage needs of the park, the project adopts a combination model of structural pool + supporting frame building functional room. 23 new units, including pretreatment system, biochemical treatment system, advanced treatment system, sludge treatment system, etc., and a new drainage pipe network of about 40,000 meters in the plant area. "Hydrolysis acidification tank, biological pool, conditioning tank...... A wide variety of pools are available. The functions of these pools are very different, and the structures are diverse, especially the leakage prevention requirements of some important sewage pools are particularly high. Once the chemical sewage in the park leaks, it will cause serious pollution and must be paid attention to. Li Weilong said.
In order to solve the problem of leakage in the pool, the project revisited the construction process. By optimizing the admixture, post-pouring belt, and increasing the expansion joint, settlement joint and other processes, the closure of the pool can be effectively improved. In the end, the pool successfully passed the closed water test before the construction of the waterproof coating, and completed the construction task with high quality.
"Drawings and on-site operations must be reviewed many times to ensure that every problem is solved during the construction process!" Li Weilong will repeatedly emphasize before each technical disclosure. In the process of process pipeline embedded construction, he found that the embedded elevation of the pipeline in a process drawing was inconsistent with the structural drawing: the elevation of the center of the embedded casing in the 102 single effluent was 455.4 meters, and the elevation of the 103 single inlet pipe was 454.15 meters, with a difference of 1.25 meters. After confirming with the design institute in time, the project was informed that the process drawings should prevail. "If it is not corrected in time, it will not only lead to the re-opening of the pipeline pre-embedded, but also affect the installation of the process pipe network between the 102 monomer and the 103 monomer. Li Weilong said. After the problem was found, the technical team immediately provided technical guidance to the site to ensure the overall construction progress of the project.
Optimize the process of pure sweet springs
As the largest sewage treatment plant in the Ganquanbao area. At the beginning of the project, the design and construction goal of "zero emission and high technology" was established. After the completion of the Ganquanbao Sewage Treatment Plant, the main task is to treat the industrial production wastewater in the park, especially the enterprise users with silicon products as the main product in the park. As a result, the wastewater here has a high ion content, and if it is not properly treated, it will have a great impact on the water safety of the entire Ganquanbao.
The water purification process commonly used in Xinjiang is grid pretreatment + regulating tank + A2O biochemical treatment + sedimentation tank + disinfection process. "This process ensures that municipal domestic wastewater types and low-pollution wastewater are treated effectively, but it is not limited for industrial wastewater with high ion content. Li Weilong introduced.
In the end, after considering the maintenance cost, feasibility and water purification efficiency from multiple perspectives, and after repeated demonstrations by the expert team, the project decided to lengthen the process treatment chain. Compared with the conventional sewage treatment process, the project adopts a composite treatment process composed of "grid + regulating tank + front-end mixed reaction sedimentation tank + hydrolysis acidification tank + AO biological tank + secondary sedimentation tank + back-end mixed reaction sedimentation tank + ultrafiltration membrane + reverse osmosis membrane (RO) + disinfection", and the treatment process is increased by more than 50%.
To put it simply, this set of processes can be summarized as a tertiary treatment process with pre-physicochemical treatment, hydrolysis acidification, and biological treatment as the core. The difficult-to-treat substances in the wastewater are absorbed and deposited through physical and chemical methods, and then various complex organic substances in the wastewater are decomposed and converted into methane and carbon dioxide through the action of anaerobic microorganisms, and finally the final water purification is completed through biological methods. Luo Jian introduced at the scene.
Especially in terms of biological treatment, after repeated literature comparison and study and related project research, the project expanded the traditional biological sludge method to hydrolysis acidification + AO biological method. After three stages of sedimentation, the discharged treated water can meet the highest standards of wastewater treatment Class A. In addition, to further implement the sustainability goals, the project also added ultrafiltration and reverse osmosis dual membrane processes to the design. This process can concentrate the produced water and further reduce the salt ion content after the effluent, making its water quality far better than the conventional Class A water quality. The separated concentrated brine can be treated with tail water and salt, and recycled in the preparation of industrial salt raw materials, contributing to the sustainable development of the park.
With the efforts of the project team, all nodes of the project construction were completed efficiently. In May 2023, all frame bodies were successfully capped. In September 2023, the construction of all external pipe drainage pipe networks in the site will be completed. In April 2024, the project will accelerate the completion of the installation of process equipment and will soon be connected to water.
This large-scale sewage treatment plant with the most advanced water purification technology in the northwest region is located in the vast northwest land, like a green fortress, guarding the water environment around Ganquanbao. "We must work hard to create high-quality projects and give back to the society with high-quality performance. Luo Jian's tone was firm. In the future, the project team will continue to move forward to build the "green heart" of the Ganquanbao area.
Source: Northwest Company of China Construction Third Bureau