September 13, 2018

Traditional Water Treatment Plants

Traditional water treatment still has an application in this modern world of water treatment.

Traditional water treatment is defined here as a water treatment system comprising the following treatment steps:

  • Chemical dosing, using a coagulant and, (for most New Zealand waters), pH adjustment.
  • Gentle mixing of the chemicals dosed with the water being treated, to form a floc.
  • Capture of the floc formed in a clarifier, (which is a gravity trap, designed a separate water from anything in the water with a specific gravity > 1).
  • Filtering out any floc fragments that escape the clarifier in a rapid sand filter.
  • Post treatment disinfection, (usually using chlorine, but sometime, UV), and pH adjustment, (to remove any corrosion potential).

Traditional water treatment plants are simple to understand and to operate.

Traditional water treatment plants are typically used for treating surface catchment waters containing turbidity and color contaminants.  They can handle waters highly contaminated with these contaminants.

Application and Benefits:

Used to produce potable water from medium to highly contaminated, (in terms of turbidity and/or color), waters.

Semi-automatic, with clarifier automatic sludge blowdown and filter backwashing on delta pressure and time inputs.

pH adjustment and chlorination, ((FAC), Free available chlorine), automation and the option offered for coagulant dosing automation.

Filter with multi-media configuration to allow long filter runs.

Air scour used in the backwash process to ensure full removal of floc particles from the filter media.

Package design, with water treatment plants designed for easy transportation, using flat racks.

Process Schematic:

Download PDF file, above