Profile: Sigma Enterprises Private Limited (SEPL) deals with water, environment & technology engineering. Our chemo autotrophic activated carbon oxidation is an integrated system of biological and chemical oxidation carried out in a single hybrid reactor packed with activated carbon based redox resin. The process involves anaerobic treatment of the waste water followed by wet air oxidation using activated carbon, which contains chemo autotrophic bacteria in immobilized state. We have a well planned & specialised program for designing, execution, commissioning & operations of water treatment, effluent treatment, sewage treatment & air treatment plants.