Wet air oxidation pretreatment of biomethanated distillery effluent: Mapping pretreatment efficiency in terms color, toxicity reduction and biogas generation

被引:35
作者
Chandra, T. Sarat [1 ]
Malik, S. N. [1 ]
Suvidha, G. [1 ]
Padmere, M. L. [3 ]
Shanmugam, P. [2 ]
Mudliar, S. N. [1 ,3 ]
机构
[1] CSIR, Natl Environm Engn Res Inst, Nagpur 440020, Maharashtra, India
[2] CSIR, Cent Leather Res Inst, Madras, Tamil Nadu, India
[3] CSIR, Cent Food Technol Res Inst, Mysore, Karnataka, India
关键词
Wet air oxidation; Distillery effluent; Melanoidin; Seed germination; Anaerobic degradation; MOLASSES WASTE-WATER; MICROBIAL DECOLORIZATION; SPENT WASH; MELANOIDIN; BIODEGRADATION; MICROORGANISMS; FERMENTATION; MYCELIA;
D O I
10.1016/j.biortech.2014.01.106
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
The effluents from molasses-based distilleries after biomethanation are beset with problems of intensified dark brown color, high residual COD, low biodegradability index (BOD/COD ratio <0.2) and toxicity issues for possible land application as a potential fertilizer. Wet air oxidation (WAO) pretreatment of biomethanated distillery effluent resulted in substantial enhancement in the biodegradability index (BI) (up to 0.8). WAO pretreated effluent on anaerobic digestion indicated favorable biogas generation with methane content up to 64% along with concomitant COD reduction up to 54.75%. The HPLC analysis indicated that the pretreatment facilitated degradation of major color containing compounds-namely melanoidins, up to 97.8%. The pretreated effluent with enhanced biodegradability along with substantially reduced color also indicated positive effect on seed germination (up to 100%), implying toxicity reduction of the effluent post WAO pretreatment. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:135 / 140
页数:6
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