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Flocculant Blocks consist of fine granules of powder grade flocculant dispersed in a solid, but readily water-soluble polymer. The carrier polymer is non-toxic. As water flows over the block, flocculant is released which reacts with sediment. The solids settle rapidly leaving a clear treated water.
Flocculant Blocks are ideal for dosing flocculant in remote locations such as storm water drains and detention dams and in situations where regular supervision of dosing is not practical.
- Clarification of storm water from construction sites.
- Clarification of storm water run off from extraction operations and stock piles at rock, sand and gravel quarries.
- Clarification of storm water from coal mining operations.
- Clarification of trade waste water.
- Clarification of lime treated clays from coal washery run off water.
Each 3kg block will treat approximately 300,000 litres of water.
The most common method for applying the blocks is to place 3-4 blocks in a 20 mm aperture wire mesh cage.
The cage is positioned at a point of turbulence that will ensure contact with most of the water flow.
A point of turbulence may have to be created if one does not exist.
The wire cage should be firmly secured by rope or other means. The turbulent flow across the blocks scours away the water soluble polymer releasing flocculant into the water stream.
Flocculation of sediment and suspended solids occurs immediately. A portion of the flocculant carries forward in the water to reflocculate the solids. This is of benefit when natural turbulence is excessive as these conditions may degrade the flocs.
For small flow rates the block can be broken into small chips and placed in a pipe or overflow weir.
Flocculation is affected by temperature and waster solids content. Cold water usually requires more mixing than warm water with high solids content.
- Low capital cost.
- Stable product and long shelf life.
- Suitable for use in locations where electrical power and make up water are not available.
- No dosing equipment to maintain and monitor.
- Simple visual method for monitoring usage rate and stock levels.
- Addition rate approximates flow proportional dosing. As water flow rate varies, the rate of block dissolution changes.
DamClear Flocculant Block AN1
Formulated for applications where water pH is relatively neutral (pH 6 - 9).
DamClear Flocculant Block AN2
Formulated for applications where water may be acidic, alkaline or where the water has been pre-treated with lime.
In many situations both types of Flocculant Blocks work equally well.
The cage is positioned at a point of turbulence that will ensure contact with most of the water flow.
Jar tests can be used to establish the best flocculant grade for a particular application. Jar tests compare the rate of solids settlement, floc size and floc strength when equal quantities of flocculant are added to equal volumes of water. Tests are typically done on one litre samples of water in a beaker or glass jar. A jar test procedure is available on request.
DamClear Flocculant Blocks do not contain aluminium or iron and will not affect water pH.
For additional information regarding product application consult your local agent or Environmental Warehouse.
Unopened product should be stored in a cool dry place away from direct sunlight and water.
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