Application and Benefits of Contact Flocculation
Contact Flocculation is a direct filtration process used to treat bore and surface water to potable water quality.
Contact Flocculation is a different water treatment process than conventional rapid sand filtration.
For a typical rapid sand filtration water treatment system, the water treatment coagulant is dosed a sufficient distance in front of the filter for flocculation to occur before the filter. This floc is filtered out of the water flow by the filter, with most of the filtration occurring in the top layer of the filter.
With contact flocculation, the water treatment coagulant is dosed close to the inlet of the first filter and flocculation occurs within the filter media of the first filter.
The floc sludge formed is stored in the volume of voids in the filter media. Because flocculation is occurring within the media, the full volume of voids within the filter media can be used for the storage of the floc sludge formed.
Any floc leakage from the first filter is captured by the second filter.
This feature allows for longer filtration runs, than those provided by a traditional rapid sand filter. Also, because of the close contact between the suspended solid and the organic particle in the water, with the coagulant, contact flocculation uses less coagulant, than conventional water treatment technology.
The contact flocculation process produces very clean treated water, at a very economical price.
Contact flocculation water treatment systems are used to treat surface catchment and bore waters with high turbidity and/or organic dissolved matter.
For New Zealand surface water applications, (low turbidity and high dissolved organic matter), the CMWEL Contact Flocculation Water Treatment systems can cope with raw waters up to 150NTU.
For waters of high turbidities, the mixed tank diameter systems are recommended.
For these mixed tank systems, the filtration rate, (filter face velocity), is lower on the first filter. The larger first filter provides a larger volume of voids in the filter media, allowing a larger volume of sludge to be stored between back washes. This allows for longer filtration runs.
- Fully automatic, backwashing on delta pressure and time inputs.
- Multi-media configuration to allow long filter runs and low micron filtration.
- Air scour used in the backwash process to ensure removal of floc particles from the filter media.
- Vessels: FRP.
- Fully Automatic. Regenerates on delta pressure, turbidity break through and/or time. PLC Controller.
- Electrically Safe: 240V; 50 Hz supply to Controller. 24VDC supply to pressure transducer and actuated valves.
- Pressure: 210 – 825 kPa
- Vacuum: Nil. (Use vacuum breaker if there is any potential for vacuum).
Contact flocculation water treatment plant models available
|CF530x450||See above tanks||3.3||40|
|CF600x530||See above tanks||4.2||40|
|CF750x600||See above tanks||6.6||50|
|CF900X750||See above tanks||9.5||80|
|CF1400x1200||See above tanks||23.1||100|
|CF1600x1400||See above tanks||26.5||100|
|CF1800x1575||See above tanks||38.2||150|
|CF2000x1800||See above tanks||47.1||150|
|CF2200x2000||See above tanks||57||150|
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