Recently, the wastewater treatment plant in the relocation project of Tianjin eastern suburb sewage treatment plant and reclaimed water plant, which was jointly constructed by CSCEC, has officially put into commercial operation. The reclaimed water plant has entered the commissioning stage and is expected to be put into operation in September. By then, the "super project" covering an area of 420000 square meters will have a daily sewage treatment scale of 600000 tons and a daily treatment scale of reclaimed water of 100000 tons, benefiting more than 1.95 million residents in four administrative regions. It will undertake the task of 1 / 5 sewage purification in Tianjin and help improve the overall water environment quality in Beijing, Tianjin and Hebei. CSCEC No.1 company participated in the construction of biological tank, secondary sedimentation tank, ozone contact tank, sludge treatment workshop, ultraviolet disinfection channel and all monomer process equipment and electrical engineering in the reclaimed water area of sewage treatment plant.
On the ground is a garden, and underground is the universe
If you look around, you can see green grass, green corridors, chic pavilions and colorful flowers. Who would have thought that there was a huge sewage treatment plant under your feet? For the relocation project of Tianjin eastern suburb sewage treatment plant and reclaimed water plant, only the underground foundation pit has the size of 24 standard football fields. In order not to affect the park landscape, the project construction adopts semi underground design. The aboveground part includes the space required for production and management activities and an ecological garden, and all sewage treatment equipment is underground.
"It's like desktop computers, displays and other accessories on the ground, and the host is buried underground. By sinking the main equipment into the ground, the problems of pollution, turbidity and noise generated in the sewage treatment process are solved, and the impact on residents and the environment is minimal. " Project manager Ren Zhanju said. The aboveground park is also integrated into the construction concept of "sponge city". Grass planting ditch, permeable pavement and rainwater garden are adopted to integrate the plant into the whole ecological park through the design of gentle slope and vertical greening.
How can the sewage from the sewage pipe network complete the transformation journey from "Turbid" to "clean"? The project team adopts the sewage treatment process of "improved multi-stage Ao + high efficiency sedimentation tank + deep bed filter + ozone oxidation + ultraviolet disinfection". The wastewater is treated by pretreatment for slag discharge and initial sedimentation. After microbial decomposition in the biological tank, the wastewater enters the high-efficiency sedimentation tank and deep bed filter to remove suspended particulates. After deodorization by ozone system and ultraviolet disinfection, the effluent quality can reach Tianjin local discharge standard a, and part of the effluent can be directly discharged to the park as landscape and wetland water. The treatment process of "ultrafiltration + reverse osmosis" is adopted in the treatment of reclaimed water. The effluent can be reused in power plants, chemical plants and toilets, so as to truly realize the water resources circulation.
Laying "expressway" according to local conditions
In the 14 meters deep underground of the ecological park, the sewage pipeline network undertakes the heavy responsibility of "one-stop sewage transportation". Traditional waterworks are connected by buried pipelines, which can be transported and constructed by crane. The project department enters the construction site after the civil structure is sealed. Large pipelines need to enter the box through the reserved two lifting holes. Due to the narrow construction space and the pipe gallery is mostly distributed at the bottom of the closed box, the maximum weight of a single pipe can reach more than 10 tons, so the crane and large trailer cannot be used during transportation and construction. How to quickly transport the pipeline to underground installation has become a "roadblock" in the project construction.
The project team innovated and developed plane transportation technology in confined space, which built a "subway" for pipeline transportation. The construction personnel lay the transportation track in the box body, transport the pipeline to the hoisting hole position in sequence according to the welding junction layout diagram by using the track trolley, and then use the self-made gantry crane to lower the pipeline into the pipe gallery, and then transport the pipeline to the construction site for installation through the rail. The successful application of this technology ensures the installation of 10000 meters of pipeline, avoids the damage of anticorrosive coating caused by pipeline transportation, and finally achieves the node target as scheduled.
Scientific policy making and efficient customs clearance
At the beginning of the project, there are only 6 management personnel, who are responsible for the installation and commissioning of equipment, pipeline and electrical equipment of nearly 100000 square meters. The construction area is wide, and most of them are underground space operations. The project department implements the regional responsibility system. Each manager claims an area, and the "district head" is responsible for the material procurement, material acceptance and later system commissioning within the scope.
During the Spring Festival, in order to achieve the goal of formal live and water commissioning, the project team led more than 120 workers to carry out power transmission detection and pipeline installation inspection on sludge treatment workshop and seven 10kv High-voltage Distribution rooms. The "two shift" mode was implemented, and the inspection and commissioning work of high-voltage distribution room that needed to be completed in 15 days was compressed to 3 days.
From the Yangtze River basin to the Yellow River Basin, from the northeast plain to the Huang Huai Hai Plain, the state-owned enterprise CSCEC has always practiced the concept of green development. The "Iron Army of water control" has been running along the major rivers, contributing professional strength to the prevention and control of water pollution and water environment, and helping to build a beautiful China! (Hong Yan)
Disclaimer: This article is translated by cpolymer. The translation is for reference only. All contents are subject to the original text.