19-08-2014, 10:48 AM
Besides different in-plant facilities like spent caustic regenerator, oil separators, the effluent contains the large amount of organic and inorganic compounds. Though the primary and secondary treatment facilities remove the substantial quantity of suspended particulates and organics from the effluent, the advanced treatment is needed for the recycling of water. The efficacy of different advanced processes for recycling the refinery waste water from secondary treatment was evaluated.
Besides different in-plant facilities like spent caustic regenerator, oil separators, the effluent contains the large amount of organic and inorganic compounds. Though the primary and secondary treatment facilities remove the substantial quantity of suspended particulates and organics from the effluent, the advanced treatment is needed for the recycling of water. The efficacy of different advanced processes for recycling the refinery waste water from secondary treatment was evaluated.
The purification of effluent with different operations showed that coagulation-flocculation was efficient in removing the suspended solids up to 80%. The further removal of particles was done by dual media filtration column operating at low superficial velocity. Photochemical operation could not remove the organics completely and requires large amount of energy per mol for the complete demineralization.
The complete removal of inorganic salts like sodium chloride was tried with reverse osmosis (RO). The batch RO data was modeled using Sorption-Diffusion model. The solute transport parameter was found to increase with the pressure indicating the damage of membrane pore structure.