Application of a Dye-Decolorizing Pseudomonas aeruginosa Strain ZM130 for Remediation of Textile Wastewaters in Aerobic/
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Application of a Dye-Decolorizing Pseudomonas aeruginosa Strain ZM130 for Remediation of Textile Wastewaters in Aerobic/Anaerobic Sequential Batch Bioreactor and Soil Columns Zahid Maqbool & Muhammad Shahid & Farrukh Azeem & Tanvir Shahzad & Faisal Mahmood & Muzammal Rehman & Tanvir Ahmed & Muhammad Imran & Sabir Hussain Received: 23 May 2020 / Accepted: 13 July 2020 # Springer Nature Switzerland AG 2020
Abstract In this study, a pre-isolated dye-decolorizing bacterium, Pseudomonas aeruginosa ZM130, was tested to explore its potential for the treatment of synthetic and real textile wastewaters in aerobic and anaerobic benchscale sequencing batch bioreactors (SBRs) as well as in constructed soil columns. The decolorizing ability of strain ZM130 against reactive black-5 (RB5) was optimized following a response surface methodology (RSM)-based approach, and this strain was observed to effectively decolorize RB5 even in presence of a substantial quantity of NaCl salt along multi-metal mixture including Cr6+, Pb2+, Cd2+, and Zn2+. In the SBR containing the immobilized cells of the strain ZM130, more than 80% of the RB5, hexavalent chromium [Cr(VI)], and chemical oxygen demand (COD) were removed from the textile wastewater under partially anaerobic condition using yeast extract as an additional carbon co-substrate. Furthermore, while studying the bioremediating ability of strain ZM130 in
constructed soil columns, the maximum color removal (> 90%), Cr(VI) removal (> 95%), and COD removal (> 90%) were achieved in the soil columns bioaugmented with ZM130 together with either sludge or yeast extract. Interestingly, it was further noticed that soil columns augmented with P. aeruginosa ZM130 also showed maximum color removal from real textile wastewater in vertical columns filled with sterilized (> 87%) and non-sterilized soil (> 91%). Based on the results of the present research work, it can be concluded that P. aeruginosa ZM130 can serve as an excellent potential candidate for treatment of textile wastewaters in bioreactors as well as in soils.
Keywords Azo dyes . Reactive black-5 . Hexavalent chromium . Soil bioaugmentation . Bioreactors . Wastewater treatment
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11270-020-04777-7) contains supplementary material, which is available to authorized users. Z. Maqbool : T. Shahzad : F. Mahmood : S. Hussain (*) Department of Environmental Sciences & Engineering, Government College University, Allama Iqbal Road, Faisalabad, Pakistan e-mail: [email protected] M. Shahid : F. Azeem Department of Bioinformatics & Biotechnology, Government College University, Faisalabad, Pakistan
M. Rehman School of Agriculture, Yunnan University, Kunming, China T. Ahmed Department of Statistics, Government College University, Faisalabad, Pakistan M. Imran Soil Science Division, Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan
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1 Introduction Textile industry supports national economy of Pakistan with a significant
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