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Direct Filtration
The DF water treatment plants use a combination of hydraulic or mechanical flocculation and rapid rate filtration to provide a potable water of superior quality. They are suitable for stable well or surface waters where turbidity levels seldom exceed about 10 - 20 NTU.
- 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 growth of the floccs which are then removed by the filter. Solids that accumulate within the filter are periodically removed by automatically controlled water or air/water backwashing.
Advantages and key features
- capacities to 1,500 gpm, (8,000 m3/d) per module
- excellent final water quality to less than 0.1 NTU
- 2.0 log protection against Giardia and Cryptosporidium
- all processes custom sized to best meet water quality goals and regulations
- quiet, simple and easy to operate with minimal operator intervention
- hydraulic flocculation reduces costs and maintenance and increases reliability
- pre-assembled and pre-tested packaged plant often saving 50% or more 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
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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