WASTEWATER TREATMENT
NEXT-LEVEL WATER TREATMENT
The HS2 site at West Ruislip in West London is huge. The view from the top of the decanter tower which is part of the project’s Wastewater Treatment Plant (WWTP) gives a hint of some of the activities underway. The new Northolt Tunnel portal is just visible, ahead are the huge conveyors that carry spoil away and, further away, there are piles of precast tunnel segments that are delivered in the night by rail.
JOBSITE OVERVIEW EXAMPLE
Herrenknecht Separation Plants optimally adapted to the project’s requirements enable an ideal interaction between advance and separation and thus maximize the performance and ensure smooth operations.
Modular tanks in various sizes provide the ability to store fresh water, fresh suspension, used suspension and centrate or filtrate water.
Modular tanks in various sizes provide the ability to store fresh water, fresh suspension, used suspension and centrate or filtrate water.
Water treatment plants enable compliance with the specified limit values of all types of wastewater occurring on the jobsite and needing to be discharged.
Water treatment plants enable compliance with the specified limit values of all types of wastewater occurring on the jobsite and needing to be discharged.
Filter presses, which use high pressure with membrane technology to filter fine solid particles such as silt and clay from liquids, ensure the lowest possible disposal costs.
Filter presses, which use high pressure with membrane technology to filter fine solid particles such as silt and clay from liquids, ensure the lowest possible disposal costs.
Centrifuges are used to separate remaining fine particles such as clay and silt from the used suspension by high rotation G-forces.
Centrifuges are used to separate remaining fine particles such as clay and silt from the used suspension by high rotation G-forces.
An additional hydrocyclone stage with a finer cut point extends the service life of the suspension in the active circuit and at the same time increases the efficiency and capacity of the following fine treatment.
An additional hydrocyclone stage with a finer cut point extends the service life of the suspension in the active circuit and at the same time increases the efficiency and capacity of the following fine treatment.
Belt conveyor systems handle and allow storage of the separated solids. Collecting, elevating or movable belt conveyors offer an optimal solution for every requirement and can be used flexibly depending on the jobsite layout and surroundings.
Belt conveyor systems handle and allow storage of the separated solids. Collecting, elevating or movable belt conveyors offer an optimal solution for every requirement and can be used flexibly depending on the jobsite layout and surroundings.
The separation plant as a multi-stage separating facility separates coarse and fine-grained solid particles from the suspension in the slurry circuit, recycles the suspension for reuse and optimally treats the solid material for further handling.
The separation plant as a multi-stage separating facility separates coarse and fine-grained solid particles from the suspension in the slurry circuit, recycles the suspension for reuse and optimally treats the solid material for further handling.
All relevant process parameters are monitored and controlled from a central control room. An integrated laboratory with equipment is available for quality control of the slurry rheology.
All relevant process parameters are monitored and controlled from a central control room. An integrated laboratory with equipment is available for quality control of the slurry rheology.
The TBM excavates soil and conveys the excavated material out of the tunnel. In slurry-supported tunnelling, the bentonite suspension supports the tunnel face in the excavation chamber, enabling a safe operation. The bentonite suspension also serves as a transport medium for the excavated soil.
The TBM excavates soil and conveys the excavated material out of the tunnel. In slurry-supported tunnelling, the bentonite suspension supports the tunnel face in the excavation chamber, enabling a safe operation. The bentonite suspension also serves as a transport medium for the excavated soil.
Bentonite mixing plants produce fresh suspension, which is fed into the slurry circuit to the TBM in the appropriate quality and quantity.
Bentonite mixing plants produce fresh suspension, which is fed into the slurry circuit to the TBM in the appropriate quality and quantity.
Centrifugal pumps convey the mixture of suspension and dissolved solids from the TBM to the surface, where it can be processed via the separation plant.
Centrifugal pumps convey the mixture of suspension and dissolved solids from the TBM to the surface, where it can be processed via the separation plant.
Modular tanks in various sizes provide the ability to store fresh water, fresh suspension, used suspension and centrate or filtrate water.
Water treatment plants enable compliance with the specified limit values of all types of wastewater occurring on the jobsite and needing to be discharged.
Filter presses, which use high pressure with membrane technology to filter fine solid particles such as silt and clay from liquids, ensure the lowest possible disposal costs.
Centrifuges are used to separate remaining fine particles such as clay and silt from the used suspension by high rotation G-forces.
An additional hydrocyclone stage with a finer cut point extends the service life of the suspension in the active circuit and at the same time increases the efficiency and capacity of the following fine treatment.
Belt conveyor systems handle and allow storage of the separated solids. Collecting, elevating or movable belt conveyors offer an optimal solution for every requirement and can be used flexibly depending on the jobsite layout and surroundings.
The separation plant as a multi-stage separating facility separates coarse and fine-grained solid particles from the suspension in the slurry circuit, recycles the suspension for reuse and optimally treats the solid material for further handling.
All relevant process parameters are monitored and controlled from a central control room. An integrated laboratory with equipment is available for quality control of the slurry rheology.
The TBM excavates soil and conveys the excavated material out of the tunnel. In slurry-supported tunnelling, the bentonite suspension supports the tunnel face in the excavation chamber, enabling a safe operation. The bentonite suspension also serves as a transport medium for the excavated soil.
Bentonite mixing plants produce fresh suspension, which is fed into the slurry circuit to the TBM in the appropriate quality and quantity.
Centrifugal pumps convey the mixture of suspension and dissolved solids from the TBM to the surface, where it can be processed via the separation plant.
PRODUCT PORTFOLIO
As part of the Herrenknecht Group, Herrenknecht Separations develops and produces integrated solutions for the separation and recycling of solid-liquid compounds issued from the jobsite operations. Separation Plants continuously separate the loaded suspension (also called slurry) from the solid particles in the slurry circuit.
State-of-the-art screening technology and hydrocyclones, in a powerful interplay of high G-forces and low cut points, deliver landfill or reusable solids with low water content. Our additional equipment takes over the separation of the remaining fine particles in the suspension to enable a continuous efficient jobsite process.
Separation Plant
> 1.000 m³/h
For the separation of solid particles from suspensions, Separation Plants use high-performance screening technologies and efficient hydrocyclones.
Separation Plant
< 1.000 m³/h
The compact 20-foot design is particularly suitable for construction sites with small slurry circuits and footprint limitations.
Fine Stage
The fine stage works as an add-on to the Separation Plant. It is equipped with several ultra-fine hydrocyclones and a high G-force fine mesh shaker. The cleaned overflow of the hydrocyclones is returned to the active tank, while the thickened underflow is discharged for dewatering. Thus, it extends the service life of the slurry. Especially in geologies with a lot of fines, the system shows great efficiency.
Centrifuge
Centrifuges are used for the fine treatment of suspensions. In a high G-force rotating drum, the solid particles, which have a higher density than the liquid, move outward due to centrifugal force. A screw conveyor continuously transports the solids to the discharging side. The liquid flows off in the opposite direction. In particular, fine particles such as silt and clay can be separated. The dewatering result can be additionally improved by the use of flocculants. This ensures lower disposal costs and a better centrate water quality.
Density Regulation System
The Density Regulation System works as an add-on to the Separation Plant. It is equipped with several ultra-fine hydrocyclones and is fed from the active circuit. The cleaned overflow of the hydrocyclones is returned to the Separation Plant active tank, while the thickened underflow is discharged into the waste suspension tank for further treatment by the filter press or centrifuge. Thus, the Density Regulation System not only extends the lifetime of the slurry but also increases the capacity of the fine separation at the same time. Especially in geologies with a lot of fines, the system shows great efficiency.
Filter Press
Filter presses are also used to remove fine particles from the waste suspension. They consist of several filter plates and chambers covered with a filter cloth. Closing the plates creates a cavity into which the suspension is fed. The liquid passes through the cloth and is drained off, while solids remain behind and gradually form a filter cake. After reaching the desired feed pressure or after a preset time has elapsed, the plates open and the filter cakes drop down to the muck pit.
Water Treatment Plant
Under the water legislation of a city or country, all wastewaters from construction sites must meet certain requirements before being discharged into the sewer system or returned to the natural environment like rivers. Water Treatment Plants enable compliance with applicable regulations which vary globally. In the best case, the water can be directly reused for subsequent jobsite processes.
For more information about our products, equipments and services visit www.herrenknecht-separations.com
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