Paint Industry

A wide range of raw materials are used in paint industry such as- resins, solvents, pigments, drying oil and extenders. Closely examine the process of making paint; water as constituent is only used in making water based paints and cooling of sand mill engaged in producing oil paints. The paint sludge contains solvents and residues which are toxic metals like mercury, lead and Chromium. Here the application of DAF technology

The waste water obtained from the paint industry is alkaline in nature and contains some oil, grease, BOD, COD and suspended solids. BOD and COD levels are only parameters that give us a rough idea of organic waste. However the paint industry’s waste water contains high level of inorganic toxic amalgams such as- lead, zinc, copper, chromium, di-phthalate, ethyl benzene, toluence and tetra chloro ethylene. DAF systems are efficiently functional in this industry because they uphold condensed flocculation stages with stocking times that can be as low as 5 to 10 minutes instead of extended time often seen in gravity clarification processes.

Characteristics of the waste water accumulated from paint industry:-

The pH value of the waste water ranges from 8.5 to 13.5. Suspended solids content range from 200 to 600 mg per liter. BOD varies from 475 to 2400 mg per liter and COD ranges from 1100 to 3800 mg per liter. Oil and grease ranges within 32 to 150 mg per liter. The phenolic immersion of this waste water from paint industry is 12.5 mg per liter.

Waste water systems applied in paint industry are a combination of the following stages:-

  • A flash Mixing / Coagulation- measure of coagulant chemicals blended with waste water is added to make chemical reactions happen. High energy, fast mixing stimulates particle collisions and good coagulation is the end result.
  • Flocculation- gentle, low energy blending takes place in this stage which converts particle size from sub-microscopic to detectable flocculated deferred particles.
  • Dissolved Air Flotation- a flotation tank filled with pressurized dissolved air bubbles which aids in releasing suspended flocculated particles, thereby forming floc-foam bed. The particles that do not float eventually sink at the bottom of the tank and get drained afterwards.
  • Filtration-treated water flows out of DAF tank into clarification membrane filtration tank where the water is treated especially to eradicate BOD using microscopic filtration cells.

Advantages of the solution we provide:-

Lower maintenance, Adaptable for varying industrial waste water treatment, Reduced energy consumption, High performance Generates 10-70 micron bubbles for maximum solids flotation efficiency, Less water consumption, Reduced air consumption, Lower retention time