TYPES OF FILTERS USED IN WASTEWATER TREATMENT

Wastewater treatment system is a system consisting of several layers of individual technologies that address wastewater treatment requirements. A constructive and efficiently-created wastewater treatment will be able to process variations in contamination and flow, discrepancy in the chemistry of water and adjustments to chemical volumes required, and plausible changes in water discharge specifications. A wastewater treatment is typically engaged in eliminating biochemical oxygen demand, nitrates and phosphates, pathogens, metals, suspended solids, dissolved solids and synthetic chemicals.

A generic wastewater treatment system must typically make use of –

  • Clarifier to settle suspended solids that are generated during the process.
  • Chemical feed to promote precipitation, flocculation or coagulation of metals and other suspended solids.
  • Filtration that helps to remove leftover portions of suspended solids.
  • Final pH adjustment and any other treatment for later requirement.
  • Control panel.

The working of a wastewater treatment system begins with the coagulation. Coagulation is the activity in which various chemicals are added to a reaction tank to eliminate the remainder of the suspended solids and other infectants. After completion of the process of coagulation comes flocculation. This is the second stage of the treatment process where water is made to enter a flocculation chamber where the coagulated elements are blended together with the help of long-chain polymers to create particles that settle down easily. From this stage, the flocculated water is passed through a gravity settler, or a clarifier, which a large apparatus wherein the water circulates from the center out. The accumulated solids settle at the bottom of the clarifier to form a sludge blanket. The next step involves passing the water through gravity sand filters. In this process, particles present in the feed water get trapped and is ready for the penultimate step, disinfection. Disinfection involves chlorination to terminate bacteria present in the water. After disinfection, the filtered or processed water is ready for the last step, distribution around the city.

Filters are classified according to the nature of the driving force that causes filtration (such as, gravity filters, pressure filters and vacuum filters) and according to mechanical characteristics (such as, leaf filters, rotary-drum fabric filters, rotary disk type filters, sand bed filters, and precoat filters.) Gravity filters are the oldest and the most traditional kind of filters. Pressure and vacuum filters act as a better substitute to gravity filters. Leaf filters are implemented in pressure filtration on a batch basis. The rotary drum filter is used in large-scale for the purpose of recurring filtration of heavy amounts of slurries laden with high masses of suspended solids. We at Puritytex are an expert at rotary drum filter fabric manufacture. This fabric is a wire screen or cloth used to cover the cylindrical drum and is partially immersed in slurry. Puritytex is also a leader at manufacture of rotary disk filter bags for rotary disk filters.

With the time and evolution, and the increasing need for liquid filtration, considering the polluted world we live in, technology is also on its path of simultaneous evolution. Puritytex is committed the growth to produce the best.

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