Coagulation

Suspended Solids Enharsement Technology

Very small solid particles:

For certain applications, the required quantity of solids cannot be removed as their particle size is too small to be mechanically sieved out and would be left in the separated liquid element. 

This can either be that the chosen separator or filter is unable to perform to the required separation level or its simply beyond any mechanical means at the throughputs required. To overcome this, coagulation technology can be used.

When to use:

Due to the nature of this technology, operating/input cost and the time requirement, liquids/slurries that contain high levels of large particle-size solids would benefit from being separated first to remove the bulk of the solids (large-sized matter), leaving the small solid particles in the liquid element that in most cases is ready for the coagulation process.

Two Methods:

Chemically:

Adding a chemical into the liquid/slurry before the final separation/filtration process works by manipulating the electrostatic charge of the suspended solid particles that bind numerous small particles, forming clusters of fewer larger-sized particles.
The chemically enhanced liquid/slurry is then passed through the final separation/Filtration process, and as these clusters are now sufficiently large enough, will not pass through a sieve screen that enables the sieve to capture them and leave them in the dry element.

Electrocoagulation:

This is a highly effective method for removing extremely small solid particles that chemical coagulation would find difficult to work with, for example, emulsified oils, heavy metals, dyes, tanning, specific water & sewage requirements etc. and even arsenic.
Using an electrolysis process, the solid particles are charged which attracts them to a sacrificial electrode plate, and as a result of the redox reaction, micro-bubbles of gas are formed, floating the solids to the surface that are degassed and collected.
Electrocoagulation is said to have no minimum suspended solid particle size limit that can be removed and also requires no chemical inclusion, therefore the ongoing operating cost is simply the overhead on the plant.