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Sequential treatment of paper mill effluent with modified Fenton oxidation and bioflocculation

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Abstract

Pollutants emerging from the effluents of paper mills eventually destroy the environment of our ecosystem. To find a proper solution of it, a cost-effective and environmentally benign technique is proposed here to remediate contaminants present in the effluent of paper mill in a sequential steps using advanced oxidation processes including Fenton reaction (FO) (Fe(II)/H2O2), modified Fenton oxidation (MFO) (Fe(II)/Zn(II)/H2O2) and biological flocculation process. A comparison and compilation among these techniques were carried out on the basis of the percentage removal of chemical oxygen demand (COD) as well as the observed degradation pattern in gas chromatography–mass spectrometry. Results revealed that MFO could remove ≥ 90% of COD at ~ 90 min, whereas FO could eliminate ≥ 80% COD at ~ 120 min. Further, the bioflocculation technique was found to reduce the heavy metal contents such as Fe, Mn, Zn, Co, Cd and Pb by ≥ 60%. In the sequential treatment process, lignin, phenolic and colour contents were also found to be reduced by ~ 84% ~ 97% and ~ 96%, respectively. Again, the bioassay tests were performed to verify the toxicity reduction in the industrial effluent after the application of the sequential treatment process. This study demonstrates that the sequential treatment technique could be an effective alternative for the treatment of paper mill effluent.

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Abbreviations

BF:

Bioflocculation test

FBF:

Combination of Fenton oxidation and bioflocculant

FO:

Fenton oxidation

MFBF:

Combination of modified Fenton oxidation and bioflocculant test

MFO:

Modified Fenton oxidation

PL:

Permissible limits

PN:

Peak number

RT:

Retention time

UT:

Untreated sample

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Acknowledgements

The authors are grateful to the Department of Science and Technology, Govt. of India and the Director of the Institute of Advanced Study in Science and Technology (IASST), Guwahati for financial support to execute this work. The authors wish to thank the Central Instrumentation Facility of IASST for availing its provisions. Authors also like to express their gratitude towards Microbial Biotechnology Laboratory, Life Sciences Division, IASST, for their tremendous help and support in carrying out in bacterial bioassay test.

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  1. Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology (IASST), Guwahati, Assam, 781035, India

    Khanindra Sharma, Mihirjyoti Pathak, Suravi Kalita & Arundhuti Devi

  2. Advanced Materials Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, 781035, India

    Neelotpal Sen Sarma

  3. Department of Chemistry, Gauhati University, Guwahati, Assam, India

    K. G. Bhattacharyya

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  1. Khanindra Sharma
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  2. Mihirjyoti Pathak
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Sharma, K., Pathak, M., Kalita, S. et al. Sequential treatment of paper mill effluent with modified Fenton oxidation and bioflocculation. Environ Dev Sustain 22, 5425–5442 (2020). https://doi.org/10.1007/s10668-019-00431-3

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