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Tube Settler (ST)
Flocculation/upflow clarification/filtration
The Tube Settler (ST) water treatment plants use proven technologies to produce clear, safe drinking water from low quality sources. Capable of purifying the most difficult types of raw water, they are particularly suitable for surface waters with high and variable contaminant loadings. They excel in treating cold water with high levels of turbidity, iron and manganese.
- custom designed
- corrosion free aluminum alloy
- mechanical or hydraulic flocculation
How it works
A coagulant is added to the raw water to precipitate dissolved contaminants and encourage suspended particles to group together in the form of "floccs". Gentle agitation in the flocculation zone encourages the floccs to grow and they are then removed by settling within a clarification zone. The accumulated solids are removed hydraulically from the clarifier floor and the clarified water passes to the filter for final polishing. Solids accumulating within the filter are periodically removed by automatically controlled water or air/water backwashing.
Advantages and key features
- capacities to 700 gpm (3,800 m3/d) per module
- excellent water quality to less than 0.1 NTU
- 2.5 log, multi-barrier protection against Giardia and Cryptosporidium
- all processes custom-sized to best meet water quality goals and regulations
- pre-assembled and pre-tested packaged plants offer savings 50% over in-situ construction
- only water, waste and electrical connections needed prior to start up
- automatic controls and monitoring systems customized to meet local needs
- inlet flow set at constant rate for simple operation, filter rate modulated to match inlet flow
- supplied complete with chemical dosing and water quality monitoring systems
Flash mixing
- multi-chemical injection ports for coagulant, polymer, pH adjustment, etc.
- static or powered mixers
Flocculation
- multi-stage hydraulic or mechanical flocculation
- carefully designed to minimize short circuiting
Clarification
- inlet/outlet manifolds for even flow distribution
- 60º, rigid plastic, settling tube modules, UV and chemical resistant
- "V" hopper bottom for sludge thickening and hydraulic sludge removal
- sludge blanket sample and location ports
- flat bottom, mechanical sludge removal option available
Filtration
- mono, dual and multi media options
- water backwash with surface wash
- air scour option available for reduced wastage and improved cleaning
- gravel support base with pipe lateral underdrain
- "non-gravel" underdrain systems available
Chemical systems
- full range of chemical mixing and dosing systems
- solution tanks, mixers, dosing pumps and safety equipment
Control systems
- PLC based for fully automatic operation and backwash initiation and sequencing
- SCADA system with data logging, report generation and remote monitoring/operation features available
Water quality monitoring
- analytical packages ranging from bench top testers to full on-line instrumentation are available
Tank construction
- aluminum 5086-H116 and 6061, built to American Aluminum Association/CSA W47.2-M1987
- smooth, attractive, maintenance free surface (steel and stainless steel are available)
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