| Fenton's reagent (oxidation) |
Simple implementation |
Production of slush |
| Ozonation (introducing gaseous ozone) |
Water volume does not elevate |
Brief half-life (nearly 20 min) |
| Photochemical degradation |
Unpleasant smell reduced |
Number of by-products generated |
| No slush accumulation |
| Biological treatments (using living organisms i.e. fungi) |
Discoloration of dyes by enzyme production |
Release of enzymes uncertain |
| Membrane separation |
Complete dye eradication |
Large amount of sludge production |
| Ion exchange |
Complete regeneration of adsorbent |
Ineffective for all dye types |
| Coagulation |
Low in cost |
Large sludge production |
| Adsorption (activated carbon) |
High efficacy |
Economically not feasible |
| Photodegradation |
Non-hazardous, high kinetics of photochemical reaction |
Low efficacy, less solar sensitivity |
| Photo-Fenton/Advance oxidation |
Less slush production, effective for high volume |
Large Ferrous sludge production |
| Water splitting |
Clear process, economical, use solar energy |
Backward reaction, side reaction |
