Pre-filtration involves the use of a filter designed to remove particulate matter (dirt, sediment, etc.) from water prior to further treatment. Pre-filtration is important for two reasons. First, larger particulate matter has the potential to clog or prematurely exhaust the filter(s) which follow it in the system.
Below are some pre-treatment solutions:
- Particle filtration
Particle filtration is a process that removes small amounts of suspended particles, ranging in size from sand to clay, from water. Particle Filtration is defined generally as the filtration of particles larger than 1 micron.Typical particle filtration process used includes:
- Bag filters
- Screen filters
- Disc filters
- Cartridge filters
- Sand filters
- Glass media filters
- Specialised media filters
- Micro filtration (MF)
Microfiltration (MF) uses physical separation to remove suspended solids and bacteria from water streams through a membrane porosity of between 0.1 to 10 micron. Microfiltration usually serves as a pre-treatment for other separation processes.
For complete removal of viruses, ultra-filtration is required. The pores of ultra-filtration membranes can remove particles of 0.001 – 0.1 micron from fluids.
- Nano filtration
Nano filtration is mainly applied in drinking water purification process steps, such as water softening, decolouring and micro pollutant removal. Nano filtration removes most organic molecules, nearly all viruses, most of the natural organic matter and a range of salts.
Depending on the application, such as for potable water, the treated effluent may require pH correction or disinfection prior to the distribution.
We custom design the post-filtration and water treatment to meet each project’s final water use requirements. Disinfection of the water is often necessary, these methods available include UV, Chlorination and Ozonation.