Dye Removal: (TEXTILE INDUSTRY)
Ozone, the powerful oxidizer and disinfectant, gives the best and safest treatment
to get the purest water !
Wastewaters from dye manufacturing and textile dyeing plants usually are highly colored and contain organic dyestuffs as well as ancillary chemicals, such as sizing agents (organic and inorganic) surface active agents, organic acids and inorganic acid salts. Depending upto the season, textile plants use different organic dyes. Therefore, the specific sources of color, BOD and COD change seasonally in this industry.
SENOZONE proposes a versatile three steps treatment for all seasons:
Preozonation using off gas of the third step, that’s to eliminate the competition for the aerobic microbes of step 3 and oxygenate the water.
Aerobic biological treatment.
The preozonation increases the DO level required for the biological treatment. Biological treatment is efficient, cheaper and eco friendly. The BOD/COD are reduced even up to 90% and the colour is reduced upto 50%.
Ozonation by high concentration ozone gas, the BOD/COD are reduced further by 50% and colour is removed upto 98%
"Ozone being the strongest oxidizing agent available for wastewater treatment will oxidize all color-causing dyestuffs to destruction."
Some dyes are more readily oxidized by ozone than others. In some cases, the ozone demand of some of the ancillaries is higher than the demand of colored dyestuffs. Consequently, bench-scale and pilot plant testing should be conducted on each sample of wastewater.
Note: Ozone appears to break down both bodies OR BOD? and color precursors that can cause further colour formation in the pans. These breakdown products are better removed than the original compounds in the carbonation/sulphitation processes.
A typical dosing to discolor a difficult and concentrated dye would be 500 ppm. (500 grams of ozone per cubic meter of effluent). When applied after biological treatment the dosing is reduced down to less than 100 ppm.
Your Attention Please! Ozone will not form sludge. So your predicament to handle those mountains of sludge will vanish … and the costs associated thereof! Chlorine must be banished in the Bleaching and colour removal processes. Ozone or Hydrogen peroxide (H2O2) can be used and do not create further pollution.