Flagship India

Design One of Combined Biological & Chemical Treatment Process

  • This schematic design is of ​Combined Chemical & Biological process for Effluent Treatment Plant with conical bottom chemical batch reaction tank.​
  • ​In the first step microbial treatment is done by either activated sludge model or granular activated sludge model (depending on effluent character) with the help of Micro Bubble Generator (MBG) & Aspirating Aerator in aeration.
  • Oil & Grease removal happens by oil skimmer for the floating components as well as by microbial digestion during this phase.
  • Chemical reaction in the conical bottom treatment tank is helped by a Variable Frequency Drive (VFD) driven mixer, which operates at 150 RPM during coagulation and at 20 RPM during flocculation.
  • For the batch treatment process calculated chemicals doses are dosed through Venturi.
  • Cyclonic flash mixer improves chemical process efficiency, whereas Hydrocyclone constantly removes heavy solids during the recirculation flow.
  • Hydrocyclone separated solids and settled solids during chemical treatment are collected and taken to sludge bed or Filter Press or Decanter Centrifuge as per need and demand of the client.
  • ​Supernatant is taken for further biological treatment and treated for at least 24 hours.
  • During this phase aeration is provided by the Aspirating Aerator.
  • Floated sludge is separated by Micro Bubble Floatation (MBF) unit and the under-drawn clarified effluent is held in an intermediate holding tank before filtration.
  • Pre-filtration is done before the Hollow Fiber Ultra Filtration (UF) Membrane Assembly Unit by crossflow arrangement to reduce fouling.
  • UF modules are selected according to the task of the particular project and are made from PVDF, PP, PVC materials.
  • For specific need, ceramic membranes are also used.
  • ​Submerged Membrane Bio Reactor (MBR) can be used in biological treatment chambers replacing those two phases mentioned earlier with much better efficiency, if the budget of the client so permits.
  • Although generally crossflow and outside to in formation for the UF membranes is selected, in specific cases tubular membranes are also used.
  • Treated effluent is then polished by Activated Carbon Filter.
  • Additional Specialty Resin Filters are used before or after the Activated Carbon Filter to remove some specific soluble pollutant when that is the demand of the project.

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