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Optimization of the parameters for decolourization by Aspergillus niger of anaerobically digested distillery spentwash pretreated with polyaluminium chloride

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Title Optimization of the parameters for decolourization by Aspergillus niger of anaerobically digested distillery spentwash pretreated with polyaluminium chloride
 
Creator SINGH, SS
DIKSHIT, AK
 
Subject waste-water
decolorization
effluent
fungi
fermentation
melanoidin
removal
molasses spentwash
decolourization
aspergillus niger
polyaluminium chloride
statistical experimental design
 
Description Molasses spentwash from distilleries is characterized by high COD and colour. The fungal decolourization of anaerobically digested molasses spentwash requires significant dilution. In this study, decolourization by Aspergillus niger isolate IITB-V8 was performed on polyaluminium chloride (PAC) treated anaerobically digested spentwash without dilution of wastewater. Optimization of parameters was studied using statistical experimental designs. In the first step, Plackett-Burman design was used for screening the important parameters. Glucose was taken as the carbon source for the growth of A. niger. KH(2)PO(4) and pH were found to be the important factors affecting decolourization. In the second step, Box-Behnken design was used to determine the optimum level of each of the significant parameters. A second-order polynomial was determined by the multiple regression analysis of the experimental data. The optimum values for the important factors to achieve maximum decolourization of 68.4% were 5.5 g/L Glucose, 1.2 g/L KH(2)PO(4) and 5 pH. The determination coefficient (R(2)) was 0.9973, which ensures adequate credibility of the model. The total decolourization obtained after fungal treatment was 86.8% which indicates fungal decolourization after pretreatment with PAC is a viable option for the treatment of digested molasses spentwash. (C) 2009
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-26T00:58:45Z
2011-12-26T12:51:14Z
2011-12-27T05:37:46Z
2011-07-26T00:58:45Z
2011-12-26T12:51:14Z
2011-12-27T05:37:46Z
2010
 
Type Article
 
Identifier JOURNAL OF HAZARDOUS MATERIALS, 176(1-3), 864-869
0304-3894
http://dx.doi.org/10.1016/j.jhazmat.2009.11.116
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6840
http://hdl.handle.net/10054/6840
 
Language en