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Title: Optimization of microbial degradation of an azo dye (methyl red) in fixed film bioreactors
Authors: Kumar, Suresh
Sharma, K P
Sharma, Shweta
Grover, Ruby
Kumar, Pawan
Soni, Pratima
Sharma, Subhasini
Keywords: bioreactor
solid matrix-texture
aerated and non-aerated conditions
inorganic and organic nutrients
methyl red
Bacillus sp.
fungi
Issue Date: Jan-2006
Publisher: CSIR
IPC CodeInt. Cl.7 C02F3/34; C02F103:30; C12R1: 645, 1:07, 1:67, 1:68, 1:685, 1:885
Abstract: The effects of inorganic (5 ppm PO4-P and 50 ppm NO3-N) and organic (30 mL/day milk whey) nutrients were examined on the microbial degradation of 100 ppm methyl red (MR) at one day retention period under aerobic and anaerobic conditions in two types of fixed film bioreactors; one prepared by using only gravel while the other, by using a mixture (3:1) of gravel and coarse river sand. The performance of the bioreactor outflows was judged (with reference to the four types of inflows used) on the basis of their per cent decolourisation, reduction in COD load and toxicity to Lemna, which was found to be more sensitive than Hydrilla. The order of their performance was as follows: MR (100 ppm) +PO4-P (5 ppm) >/ MR (100 ppm) + PO4-P+NO3-N+ Milk whey > MR (100 ppm) + PO4-P+NO3-N (50 ppm) >/MR (100 ppm). In MR +PO4-P treatment, the outflows from aerated bioreactors were found non-toxic to Lemna and percentage reduction in COD load (63-70%) and decolourisation (90-94%) were also maximum. They, however, were found toxic in other treatments. Among the bioreactors, gravel bed exhibited excellent performance.
Page(s): 68-75
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Source:IJBT Vol.05(1) [January 2006]

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