Volume No. 8 Issue No.: 3A Page No.: 697-704 Jan-Mar 2014

 

INDUSTRIAL WASTEWATER TREATMENT - REMOVAL OF ACID FROM WASTEWATER

 

Sorokhaibam Laxmi Gayatri, Bhandari Vinay M. * and Ranade Vivek V.

Chemical Engineering and Process Development Division, National Chemical Laboratory, Pune, Maharashtra (INDIA)

 

Received on : October 05, 2013

 

ABSTRACT

 

Environmental pollution due to hazardous organic acid pollutants such phenolics and carboxylic acids in industrial wastewater streams is a serious concern from environmental pollution point of view. The nature of pollutants and their concentrations vary substantially for different effluents and devising a suitable treatment methodology for these dilute streams is a challenge, many a times, unique to specific industry due to the difficulties in bringing down the concentrations to meet very low statutory limits for the protection of the environment. In the present work, we report the studies on removal of acidic pollutants mainly carboxylic acids and phenolics. A review of different methodologies for the removal of acids indicates that adsorptive processes are best suited for removal as well as recovery of valuable acids. However, when the concentrations are very low and removal of the hazardous organics is essential, destructive methods for mineralization of acids such as hydrodynamic cavitation can be possibly and favourably considered as against conventional methods such adsorption/ ion exchange. Experimental studies have been carried out for removal of organic acids using hydrodynamic cavitation employing vortex diode as cavitating device. Newer device such as vortex diode has been found to be substantially useful in reducing organic pollutants from wastewater streams and the extent of removal depends strongly on pollutant species. A new methodology of process integration combining hydrodynamic cavitation and adsorption is expected to have wider applications in mitigating environmental pollution in chemical industries.

 

Keywords : Acid removal, Hydrodynamic cavitation, Environmental pollution, Vortex diode, Wastewater treatment

 

 

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