Killearn Lakes Plantation Restoration: Clean Lakes Project Tallahassee, Florida

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At the heart of the process is the ability to contact the coagulation of fine particles of pollution of water adhere to the surface of larger particles of sand, which is made by filtering water.
By its very nature the process of trapping small particles to large closely associated with coagulation, i.e., loss of aggregate stability of a colloidal system of delayed particle filter.
For trapping small particles suspended in large grains of filter media you need to create conditions under which may appear to gravity. You need to provide such conditions the fluid in which fine particles of pollution could be closer to large grains of the filter is loaded, breaking the force of repulsion due to electrostatic charges of particles.
Contact coagulation process is different from the normal coagulation occurring in the liquid bulk, more speed and completeness of the detention of small particulate matter filter loading. This is due to very intense adhesion of fine particles to large. The speed of this process is much more than the rate of clumping together of small particles due to the fact that the probability of attraction of small particles of large grain filter media is much more likely collision between a small particle. In addition, small particles with electrostatic charges can be much easier to stick to large, devoid of charges, than to each other. It may be that the concentration of coagulating agents, yet insufficient to cause coagulation of small particles in the liquid bulk, provides adhesion of fine particles to large.
The most effective contact coagulation is manifested when added to water, coagulant, and immediately filter the water through a granular medium, such as sand.
First, by increasing the dose of coagulant turbidity does not change, remaining constant, but slightly lower than in the source water. Then, after reaching a certain dose comes the "threshold of coagulation," and the turbidity of the filtrate is sharply reduced. The subsequent increase in coagulant dose has little effect on the further clarification of the filtrate.
Typically, the coagulant dose, corresponding to the threshold of the contact coagulation, is smaller than for the coagulation of the same suspension in the liquid bulk, but nevertheless, when the intensity of small particles sticking to the grains of filter media gets a lot more than that of the agglomeration of small particles together, and this affects the overall effect in increasing water clarification. During filtration through the sand full of water by lightening the trapping of fine particles of sand grains to be achieved for 5-10 seconds, while for the mutual adhesion of the particles during the coagulation in the amount required 20-40 min. When the contact coagulation completeness purification of water from the suspension obtained more than a conventional coagulation and sedimentation.