Volume No. 7 Issue No.: 2 Page No.: 724-728 Oct. - Dec. 2012

 

Review paper (NS) ENZYME BASED PROCESSES FOR REMOVAL OF PHENOL FROM WASTE WATER : CURRENT STATUS AND FUTURE CHALLENGES

 

Narayan A.V. * and Agrawal Pushpa

Department of Biotechnology, R V College of Engineering, R.V. Vidyaniketan, Bangalore (INDIA)

 

Received on : July 05, 2012

 

ABSTRACT

 

Phenols are present in effluents of a number of industries such as coal conversion, resins, plastic, petroleum refining, textiles, dyes and organic chemicals. It is toxic to aquatic creatures, has a high Biological Oxygen Demand (BOD) and at high concentrations depletes the oxygen in water. Conventional processes for removal of phenols from waste water include extraction, adsorption on suitable adsorbents, steam distillation, bacterial and chemical oxidation, electrochemical techniques, etc. All these process have drawbacks of incomplete removal of phenols, low efficiency and problems of disposal of spent solution. Hence an alternative based on enzymes has been investigated. Enzymes are highly selective, can effectively treat even dilute waste, remove phenol almost completely and require low retention time compared to conventional processes. This review summarizes the current research based on removal of phenol from waste streams by enzyme of class oxidoreductases such as peroxidase, polyphenoloxidase (tyrosinase) and laccase. The future challenges such as disposal of reaction products and byproducts, maintaining enzyme activity in the waste water for a longer duration and cost reduction of enzyme needed by effective downstream processes are presented.

 

Keywords : Phenol removal, Peroxidase, Tyrosinase, Laccase, Waste water treatment, Downstream process

 

 

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