Technical Innovation of Second Phase of Sewage Treatment Project

Abstract: The second phase of Shanghai Sewage Treatment Project is a World Bank loan project. The project mainly solves part of the sewage in Wujing, Minhang, Xuhui, Luwan and Pudong New Area in the upper reaches of Huangpu River. After the interception of Xuhui and Luwan, the confluent sewage passes through the Huangpu River and is lifted by the pumping station and then transported to the vicinity of Bailonggang in the Changjiang Estuary along with the sewage from Wujing, Minhang and Pudong New Areas. After the merger with the sewage taken in by the former South Main Line, Treatment plant deepwater discharge after treatment.

Key words: sewage treatment halfway pumping station project

The second phase of Shanghai Sewage Treatment Project is a World Bank loan project. The project mainly solves part of the sewage in Wujing, Minhang, Xuhui, Luwan and Pudong New Area in the upper reaches of Huangpu River. After the interception of Xuhui and Luwan, the confluent sewage passes through the Huangpu River and is lifted by the pumping station and then transported to the vicinity of Bailonggang in the Changjiang Estuary along with the sewage from Wujing, Minhang and Pudong New Areas. After the merger with the sewage taken in by the former South Main Line, Treatment plant deepwater discharge after treatment.

The total service area of ​​the project is 271.7km2, with a service population of 3.3576 million. The sunny dry-stream sewage volume is about 172m3 / d, and the total amount of rainy day interceptions is 29.67m3 / s. The total investment of the project is about 4.8 billion yuan, of which the World Bank loans 250 million U.S. dollars.

Shanghai Municipal Engineering Design Institute is mainly responsible Puxi closure system (not package including Wujing, Minhang area), inverted siphon Huangpu River, Pudong Explorer (South Line), connecting tube, midway pump station (pump station south lines SA, SB Pump Station ), Export pumping station. The project started its initial design in 1994 and all the construction drawings were completed by the beginning of 1999 and completed in early 2000.

Midway Pumping Station includes South Line SA Pumping Station and SB Pumping Station: SA Pumping Station is the first mid-route pumping station on South Line, which is mainly used for upgrading of 6 routes from Luban Road, Zhaojiabang, Xiaomuqiao, Wanping, Longhua Town and Puhuiatang in Puxi Condensate drainage system. Pump station is located in the west of Pudong Yaohua branch, the Huangpu River, and Longhua Airport across the river. Huangpu River inverted Pudong tube wells located in the pumping station. Pumping station by peak rainfall of 120% with the pump, with a pump flow of 22.2m3 / s, with six pumps (five with a prepared). The total forward lift of the pump is 18.80m, the recent lift is 12.10m ~ 7.00m. Pump station covers an area of ​​about 1.04 hectares. Pump station total investment of about yuan.

SB pumping station is located in the west of Pudong Cambridge Industrial Zone in Shanghai, Yanggao South Outer Ring Road Interchange 750m east, south of the outer ring pumping station, west of the same Fenjing. The pump station mainly accepts SA pumping station and sewage from Wujing, Minhang and Yangsi areas in Pudong. After upgrading, it will connect the outer ring road and Luoshan Road to the midline, transfer to M2 pumping station and forward to south C pumping station . Pump station covers an area of ​​about 1.5 hectares. The main pump room set a total of six spiral mixed flow pump, five with a prepared, two of which for the frequency control pump. Pump flow 6.26 ~ 7.80m3 / s, head 19.1 ~ 12.60m, pump motor power 1600kw, calculated load of 8500kw. Is the second phase of sewage treatment installed capacity of pumping station, is also the largest municipal projects of similar diameter garden sinkhole. Pumping a total investment of about 130 million yuan.

The main features of the project (1) SA, SB pump station is a mid-way pumping station with rain and sewage confluence, and there is a big difference between the amount of sewer water in the rainy season and the dry stream in the rainy season. Near and far the amount of water is also a big difference. Considered from the system, due to changes in flow will cause changes in the loss of water head, causing changes in the pump head. Therefore, SA, SB pump station design, and out of the water tank Han adopt two holes, use a hole near future, long-term use two holes, culvert near future to ensure the flow rate does not reach the silt flow rate. The number of pumps used six, five with a prepared, of which two sets of frequency control pump, to adapt to the normal operation of the system in different conditions, reducing the number of pumps to open the pump. Pump type According to the pump flow, lift, the final number of turns than the vertical spiral mixed flow pump, pump, motor split installation. The performance of the main pump according to the design point A (the best efficiency point that is open two pumps, a box culvert running), the maximum flow point B (single pump operation) and the minimum flow point C (five pumps in parallel operation )determine.

(2) In the second phase of Shanghai Sewage Treatment Project, SA Pumping Station is the deepest pumping station of a pumping station. SB pumping station is the largest installed capacity pumping station with the largest caisson diameter. Poor pumping station conditions, caisson design requirements, types of mechanical and electrical equipment, the system is complex, large amount of equipment with the workload. Pump pumping station main pump room layout of the internal complex, difficult to design. The main round pumping station is a large circular caisson used in municipal projects for the first time, the high shaft volume, high water level, bearing capacity, impermeability requirements, the first concrete tank design using prestressed technology.

Project Innovation and Advanced Technology Designing of Mid-stage Pumping Station of Shanghai Sewage Treatment Phase II Project On the basis of earnestly drawing on the experience of Phase I project, we boldly used new technologies, new processes and new equipment to save investment and save operating costs. The main innovations are as follows: (1) In the design of large-scale pumping station inflow pool, due to the limitation of round caisson, the inflow conditions of the front pool are poor, and the integrated rectification measures of diversion pier and pressurized water plate are provided to improve the inflow of water into the front pool Conditions, so that the former pool uniform water, improve pump efficiency. According to the hydraulic model test results, the efficiency of the three-run pump can be increased by about 4.0% -4.4% after the rectification measures are adopted in the forebay. The content of sand in the confluent sewage is high, and the larger bottom slope I = 0.3 ~ 0.37 is adopted in the forecourt design. Combined with the effect of the pressurized water board, the underflow velocity is increased to avoid sediment deposition at the bottom of the pool.

(2) For the first time, the inlet water of the pump is in the form of elbow pipe water, absorbing water directly from the front pool, improving the inlet flow state of the water pump and reducing the depth of the pumping station. More general pipeline water can reduce pump room depth of 1.0 ~ 1.5m. In order to facilitate the overhaul of the pump, the electric stainless steel gate 4.5 × 3.25m is used for the first time before the water inlet of the water pump.

(3) Two steel couplings or universal joints are set at the connection between the motor and the pump. The flexible connection facilitates the installation and maintenance of the pump and the motor, and at the same time compensates for the displacement of the pump shaft. This technology was first applied to Municipal water pump. The outlet of the pump set up a thrust pier, to solve the main pipe of the problem of force. In order to facilitate the daily maintenance and repair of equipment, an additional maintenance layer is added between the pump layer and the motor layer, which reduces the height and the number of the inspection platforms and makes the internal layout of the pump room more reasonable.

(4) Vertical and vertical pipelines, fire-fighting stairs and elevator shafts are set up by utilizing the free corners on the two sides of the cavern's north and south sides of the pumping station. All kinds of pipelines are moved into the pipelines so that the layout of pumping stations is more rational and beautiful. Two-way elevator door open, so that the lower part of the pump room and the upper complex interlinked, so that the operation and management convenience.

(5) a main pump to reduce the water consumption of the auxiliary water, auxiliary water pump house in the design, using a pump, the motor of the cooling water circulating recycling programs, cooling towers and water tanks set up production, reduce water consumption. Pump seal water pipe for the first time using a constant pressure valve.

(6) The comprehensive building and the garage are arranged in the upper part of the front pool of the main pump house, which not only solves the anti-floating of the front pool of the pump house, but also reduces the land use of the pumping station and increases the greening area so that the layout of pumping stations is more reasonable.

(7) In order to prevent volatile odor from entering the sewage, a closed front pond and a high well are used, and a special ventilation riser is installed in the front pool of the pumping station to discharge the odor at high altitudes and reduce the influence of the sewage odor on the surrounding environment .

(8) The caisson structure is used in the lower part of the main pumping station, which is a large circular caisson. The outer diameter of SB pumping station structure is 52.4m, which is the largest caisson in municipal engineering. SA pump station structure diameter 47.4m, depth 24.5m, is the deepest pump house caisson in the second phase project. The subsidence beam is installed on the caisson floor, which increases the rigidity of the lower part of the caisson, solves the problem of large subsidence factor and shrinkage of the concrete floor, effectively controls the subsidence rate and resolves the difficulty of large caisson sinking. The circular structure takes full advantage of the reasonable force and the compressive strength of concrete, which obviously reduces the amount of steel.

(9) For the first time, non-bonded prestressed reinforced concrete technology was adopted in high-level wells, the deformation joint was canceled, the problem of shrinkage and temperature cracking of concrete was solved, and the seepage- proof and leakage prevention performance of high-level wells was raised.

(10) 6KV frequency control device with perfect harmonic mode. With the output from the fluctuations of the power grid, does not produce the harmonics that cause the motor heat, without the need for special speed motor, low noise, is the current international advanced products.

(11) 35KV high voltage switchgear SF6 gas insulated, metal shell structure, built-in vacuum circuit breakers, three-position switch, microprocessor-based integrated protection device. With full-featured, small size, high degree of protection , safe and reliable, and other characteristics, is the current international advanced products.
Abstract: The second phase of Shanghai Sewage Treatment Project is a World Bank loan project. The project mainly solves part of the sewage in Wujing, Minhang, Xuhui, Luwan and Pudong New Area in the upper reaches of Huangpu River. After the interception of Xuhui and Luwan, the confluent sewage passes through the Huangpu River and is lifted by the pumping station and then transported to the vicinity of Bailonggang in the Changjiang Estuary along with the sewage from Wujing, Minhang and Pudong New Areas. After the merger with the sewage taken in by the former South Main Line, Treatment plant deepwater discharge after treatment.

Key words: sewage treatment halfway pumping station project

The second phase of Shanghai Sewage Treatment Project is a World Bank loan project. The project mainly solves part of the sewage in Wujing, Minhang, Xuhui, Luwan and Pudong New Area in the upper reaches of Huangpu River. After the interception of Xuhui and Luwan, the confluent sewage passes through the Huangpu River and is lifted by the pumping station and then transported to the vicinity of Bailonggang in the Changjiang Estuary along with the sewage from Wujing, Minhang and Pudong New Areas. After the merger with the sewage taken in by the former South Main Line, Treatment plant deepwater discharge after treatment.

The total service area of ​​the project is 271.7km2, with a service population of 3.3576 million. The sunny dry-stream sewage volume is about 172m3 / d, and the total amount of rainy day interceptions is 29.67m3 / s. The total investment of the project is about 4.8 billion yuan, of which the World Bank loans 250 million U.S. dollars.

Shanghai Municipal Engineering Design Institute is mainly responsible Puxi closure system (not package including Wujing, Minhang area), inverted siphon Huangpu River, Pudong Explorer (South Line), connecting tube, midway pump station (pump station south lines SA, SB Pump Station ), Export pumping station. The project started its initial design in 1994 and all the construction drawings were completed by the beginning of 1999 and completed in early 2000.

Midway Pumping Station includes South Line SA Pumping Station and SB Pumping Station: SA Pumping Station is the first mid-route pumping station on South Line, which is mainly used for upgrading of six routes from Luban Road, Zhaojiabang, Xiaomuqiao, Wanping, Longhua Town and Puhuiatang in Puxi Condensate drainage system. Pump station is located in the west of Pudong Yaohua branch, the Huangpu River, and Longhua Airport across the river. Huangpu River inverted Pudong tube wells located in the pumping station. Pumping station by peak rainfall of 120% with the pump, with a pump flow of 22.2m3 / s, with six pumps (five with a prepared). The total forward lift of the pump is 18.80m, the recent lift is 12.10m ~ 7.00m. Pump station covers an area of ​​about 1.04 hectares. Pump station total investment of about yuan.

SB pumping station is located in the west of Pudong Cambridge Industrial Zone in Shanghai, Yanggao South Outer Ring Road Interchange 750m east, south of the outer ring pumping station, west of the same Fenjing. The pump station mainly accepts SA pumping station and sewage from Wujing, Minhang and Yangsi areas in Pudong. After upgrading, it will connect the outer ring road and Luoshan Road to the midline, transfer to M2 pumping station and forward to south C pumping station . Pump station covers an area of ​​about 1.5 hectares. The main pump room set a total of six volute mixed flow pump, five with a preparation, of which two for the frequency control pump. Pump flow 6.26 ~ 7.80m3 / s, head 19.1 ~ 12.60m, pump motor power 1600kw, calculated load of 8500kw. Is the second phase of sewage treatment installed capacity of pumping station, is also the largest municipal projects of similar diameter garden sinkhole. Pumping a total investment of about 130 million yuan.

The main features of the project (1) SA, SB pump station is a mid-way pumping station with rain and sewage confluence, and there is a big difference between the amount of sewer water in the rainy season and the dry stream in the rainy season. Near and far the amount of water is also a big difference. Considered from the system, due to changes in flow will cause changes in the loss of water head, causing changes in the pump head. Therefore, SA, SB pump station design, and out of the water tank Han adopt two holes, use a hole near future, long-term use two holes, culvert near future to ensure the flow rate does not reach the silt flow rate. The number of pumps used six, five with a preparation, of which two sets of variable frequency speed control pump to adapt to the normal use of the system in different conditions, reducing the number of pumps to open the pump. Pump type According to the pump flow, lift, the final number of turns than the vertical spiral mixed flow pump, pump, motor split installation. The performance of the main pump according to the design point A (the best efficiency point that is open two pumps, a box culvert running), the maximum flow point B (single pump operation) and the minimum flow point C (five pumps in parallel operation )determine.

(2) In the second phase of Shanghai Sewage Treatment Project, SA Pumping Station is the deepest pumping station of a pumping station. SB pumping station is the largest installed capacity pumping station with the largest caisson diameter. Poor pumping station conditions, caisson design requirements, types of mechanical and electrical equipment, the system is complex, large amount of equipment with the workload. Pump pumping station main pump room layout of the internal complex, difficult to design. The main round pumping station is a large circular caisson used in municipal projects for the first time, the high shaft volume, high water level, bearing capacity, impermeability requirements, the first concrete tank design using prestressed technology.

Project Innovation and Advanced Technology Designing of Mid-stage Pumping Station of Shanghai Sewage Treatment Phase II Project On the basis of earnestly drawing on the experience of Phase I project, we boldly used new technologies, new processes and new equipment to save investment and save operating costs. The main innovations are as follows: (1) In the design of large-scale pumping station inflow pool, due to the limitation of round caisson, the inflow conditions of the front pool are poor, and the integrated rectification measures of diversion pier and pressurized water plate are provided to improve the inflow of water into the front pool Conditions, so that the former pool uniform water, improve pump efficiency. According to the hydraulic model test results, the efficiency of the three-run pump can be increased by about 4.0% -4.4% after the rectification measures are adopted in the forebay. The content of sand in the confluent sewage is high, and the larger bottom slope I = 0.3 ~ 0.37 is adopted in the forecourt design. Combined with the effect of the pressurized water board, the underflow velocity is increased to avoid sediment deposition at the bottom of the pool.

(2) For the first time, the inlet water of the pump is in the form of elbow pipe water, absorbing water directly from the front pool, improving the inlet flow state of the water pump and reducing the depth of pumping station. More general pipeline water can reduce pump room depth of 1.0 ~ 1.5m. In order to facilitate the overhaul of the pump, the electric stainless steel gate of 4.5 × 3.25m is used for the first time before the water inlet of the water pump.

(3) Two steel couplings or universal joints are set at the connection between the motor and the pump. The flexible connection facilitates the installation and maintenance of the pump and the motor, and at the same time compensates for the displacement of the pump shaft. This technology was first applied to Municipal water pump. The outlet of the pump set up a thrust pier, to solve the main pipe of the problem of force. In order to facilitate the daily maintenance and repair of equipment, an additional maintenance layer is added between the pump layer and the motor layer, which reduces the height and the number of the inspection platforms and makes the internal layout of the pump room more reasonable.

(4) Vertical and vertical pipelines, fire-fighting stairs and elevator shafts are set up by utilizing the free corners on the two sides of the cavern's north and south sides of the pumping station. All kinds of pipelines are moved into the pipelines so that the layout of pumping stations is more rational and beautiful. Two-way elevator door open, so that the lower part of the pump room and the upper complex interlinked, so that the operation and management convenience.

(5) a main pump to reduce the water consumption of the auxiliary water, auxiliary water pump house in the design, using a pump, the motor of the cooling water circulating recycling programs, cooling towers and water tanks set up production, reduce water consumption. Pump seal water pipe for the first time using a constant pressure valve.

(6) The comprehensive building and the garage are arranged in the upper part of the front pool of the main pump house, which not only solves the anti-floating of the front pool of the pump house, but also reduces the land use of the pumping station and increases the greening area so that the layout of pumping stations is more reasonable.

(7) In order to prevent volatile odor from entering the sewage, a closed front pond and a high well are used, and a special ventilation riser is installed in the front pool of the pumping station to discharge the odor at high altitude and reduce the influence of the sewage odor on the surrounding environment .

(8) The caisson structure is used in the lower part of the main pumping station, which is a large circular caisson. The outer diameter of SB pumping station structure is 52.4m, which is the largest caisson in municipal engineering. SA pump station structure diameter 47.4m, depth 24.5m, is the deepest pump house caisson in the second phase project. The subsidence beam is installed on the caisson floor, which increases the rigidity of the lower part of the caisson, solves the problem of large subsidence factor and shrinkage of the concrete floor, controls the subsidence rate effectively and resolves the difficulty of large caisson sinking. The circular structure takes full advantage of the reasonable force and the compressive strength of concrete, which obviously reduces the amount of steel.

(9) For the first time, non-bonded prestressed reinforced concrete technology was adopted in high-level wells, the deformation joint was canceled, the problem of shrinkage and temperature cracking of concrete was solved, and the seepage- proof and leakage prevention performance of high-level wells was raised.

(10) 6KV frequency control device with perfect harmonic mode. With the output from the fluctuations of the power grid, does not produce the harmonics that cause the motor heat, without the need for special speed motor, low noise, is the current international advanced products.

(11) 35KV high voltage switchgear SF6 gas insulated, metal shell structure, built-in vacuum circuit breakers, three-position switch, microprocessor-based integrated protection device. With full-featured, small size, high degree of protection , safe and reliable, and other characteristics, is the current international advanced products.

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