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The double-layer rectangular horizontal flow sedimentation tank is a vertically stacked double-layer rectangular tank structure.
Application
• Municipal wastewater treatment plants
• Reconstruction and expansion projects
The double-layer rectangular horizontal flow sedimentation tank is a vertically stacked double-layer rectangular tank structure.
Application
• Municipal wastewater treatment plants
• Reconstruction and expansion projects
Description
• The upper and lower layers operate independently while sharing side walls to save space.
• Through this vertical stacking design, it retains the advantages of stable water flow and simple maintenance of single-layer tanks, while significantly improving space efficiency and treatment capacity.
• It is a cost-effective choice for small and medium-sized water treatment projects, particularly suitable for sustainable development needs in land-constrained areas.
Principle
• Sewage undergoes horizontal push flow in each layer (flow velocity: approximately 5–10 mm/s), with suspended solids settling under gravity.
• Water flows uniformly from the inlet to the outlet, with a hydraulic retention time (HRT) of 1–2 hours per layer.
• Suspended solids settle to the tank bottom, where a sludge scraper pushes the sludge into a shared sludge hopper for discharge.
• Clarified water is collected through overflow weirs and discharged.
• The double-layer design allows parallel or series operation (e.g., the upper layer handles high-load influent, while the lower layer is used for fine sedimentation).
Advantage
• 40%–50% reduction in land occupation compared to single-layer sedimentation tanks.
• Optimized flow paths: water distribution via perforated baffles in the upper layer and bottom diffuser pipes in the lower layer effectively avoids short-circuiting and improves sedimentation efficiency.
• Layered sedimentation with synergistic functions: the upper layer efficiently intercepts light
• suspended solids (grease, fibers), while the lower layer uses gravity to concentrate and settle heavy particles (metals, sand), enhancing solid-liquid separation.
• Energy-saving design: sludge discharge is achieved using high water level differences, reducing energy consumption and operational costs.
• Environmental design: independent water inlets and a shared sludge hopper, with only one layer of water surface exposed, effectively controlling odor and volatile organic compound (VOC) emissions.
Description
• The upper and lower layers operate independently while sharing side walls to save space.
• Through this vertical stacking design, it retains the advantages of stable water flow and simple maintenance of single-layer tanks, while significantly improving space efficiency and treatment capacity.
• It is a cost-effective choice for small and medium-sized water treatment projects, particularly suitable for sustainable development needs in land-constrained areas.
Principle
• Sewage undergoes horizontal push flow in each layer (flow velocity: approximately 5–10 mm/s), with suspended solids settling under gravity.
• Water flows uniformly from the inlet to the outlet, with a hydraulic retention time (HRT) of 1–2 hours per layer.
• Suspended solids settle to the tank bottom, where a sludge scraper pushes the sludge into a shared sludge hopper for discharge.
• Clarified water is collected through overflow weirs and discharged.
• The double-layer design allows parallel or series operation (e.g., the upper layer handles high-load influent, while the lower layer is used for fine sedimentation).
Advantage
• 40%–50% reduction in land occupation compared to single-layer sedimentation tanks.
• Optimized flow paths: water distribution via perforated baffles in the upper layer and bottom diffuser pipes in the lower layer effectively avoids short-circuiting and improves sedimentation efficiency.
• Layered sedimentation with synergistic functions: the upper layer efficiently intercepts light
• suspended solids (grease, fibers), while the lower layer uses gravity to concentrate and settle heavy particles (metals, sand), enhancing solid-liquid separation.
• Energy-saving design: sludge discharge is achieved using high water level differences, reducing energy consumption and operational costs.
• Environmental design: independent water inlets and a shared sludge hopper, with only one layer of water surface exposed, effectively controlling odor and volatile organic compound (VOC) emissions.