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http://dx.doi.org/10.4014/mbl.1901.01014

Cultivable Bacterial Community Analysis of Dairy Activated Sludge for Value Addition to Dairy Wastewater  

Biswas, Tethi (Department of Microbiology, Tripura University)
Chatterjee, Debasmita (Department of Biotechnology, Maulana Abul Kalam Azad University of Technology)
Barman, Sinchini (Department of Biotechnology, Maulana Abul Kalam Azad University of Technology)
Chakraborty, Amrita (Department of Microbiology, Tripura University)
Halder, Nabanita (Department of Microbiology, Tripura University)
Banerjee, Srimoyee (Department of Microbiology, Tripura University)
Chaudhuri, Shaon Ray (Department of Microbiology, Tripura University)
Publication Information
Microbiology and Biotechnology Letters / v.47, no.4, 2019 , pp. 585-595 More about this Journal
Abstract
Analysis of bacterial communities based on their 16S rDNA sequences revealed the predominance of Proteobacteria (Aeromonas sp., Acinetobacter sp. and Thaueraamino aromatica sp.) and uncultured bacterium in activated sludge from the effluent treatment plant (ETP) of Mother Dairy, Calcutta (India). Each isolate was used for bioremediation of dairy wastewater with simultaneous conversion of nitrogenous pollutants into ammonia. A consortium developed using seven of these isolates and three Bacillus strains from different environmental origins could reduce 93% nitrate with simultaneous production of ammonia (626 ㎍/100 ml) within 20 h in non-aerated, immobilized conditions as compared to 82% nitrate reduction producing 2.4 ㎍/100 ml ammonia in 96 h with extensive aeration in a conventional ETP. The treated ammonia-rich effluent could be used instead of freshwater and fertilizer during cultivation of mung bean with 1.6-fold increase in grain yield. The ETP with the surrounding agricultural land makes this process a zero liquid discharge technology for using the biofertilizer generated. In addition, the process requires minimal energy supporting sustained environmental health. This method is thus proposed as an alternative approach for small-scale dairy ETPs.
Keywords
Dairy wastewater; activated sludge; bioremediation; bacteria; biofertilizer;
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