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9 results on '"Sachan, Preeti"'

5. A review on bioremediation of pulp and paper mill effluent – An alternative to conventional remedial technologies

Author

Madan, Sangeeta, Sachan, Preeti, Singh, Utkarsh, Madan, Sangeeta, Sachan, Preeti, and Singh, Utkarsh

Abstract

At present, a large amount of water required for paper production and various chemicals has been identified in effluents, which is produced at different steps of paper making in paper mills. The pulp and paper industry is typically related to pollution difficulties related to high biological oxygen demand (BOD), chemical oxygen demand (COD), colour, suspended solids, lignin and chlorinated compounds. Several studies have been made on eliminate these difficulties of pulp and paper effluents, the problem still continues. Although the physical and chemical methods are on the track of treatment, they are not on par with biological treatment because of cost ineffectiveness and residual effects. The biological treatment is known to be effective in reducing the organic load and toxic effects of paper mill effluents. Some microorganisms including bacteria and fungi have been involved in degrading the chemicals present in pulp and paper mill effluent. This article is an overview of the attempts made by several researchers worldwide to use biotechnological methods for degradation of the toxic compounds present in pulp and paper mill effluents by using fungi, bacteria, algae and enzymes. The current study clearly shows that application of native dominant bacterial and fungal isolates may be used forthe treatment of large pulp and paper mills effluents.

Published
2018

8. LAB SCALE STUDY ON CHARACTERIZATION AND IDENTIFICATION OF PHENOL DEGRADING BACTERIA ISOLATED FROM PULP AND PAPER MILL EFFLUENT.

Author

Sachan, Preeti, Madan, Sangeeta, Hussain, Athar, and Singh, Utkarsh

Subjects
PAPER mill waste, BACTERIAL typing, WATER quality, WASTEWATER treatment, RIBOSOMAL RNA
Abstract

The untreated effluents from paper mills discharged into water bodies, damages the water quality and living organisms. Due to several limitations in the physicochemical treatment methods for treating industrial wastewaters the biological methods are more favourable alternative for the removal of pollutants. In the present study, phenol degrading activity by bacterial isolates collected from industrial effluent has been investigated. The isolated strains were further characterized by morphological, physiological, biochemical and 16S rRNA gene analysis. Isolates as Staphylococcus sp. (MH935803) and Staphylococcus sciuri (MH938044), has been identified in the present study. These two isolates have been identified as novel and potential aerobic bacterial strains that showed maximum survival in the phenol concentration up to 1600 mg/L and 1800 mg/L respectively. Further these strains may be used for biodegradation of phenol containing pulp and paper mill effluent. The study focuses on the characterization of efficient phenol degrading bacteria found in pulp and paper mill effluent which can be considered for use in large scale biorefining. [ABSTRACT FROM AUTHOR]

Published
2019
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9. Simultaneous biodegradation of phenol and cyanide present in coke-oven effluent using immobilized Pseudomonas putidaand Pseudomonas stutzeri

Author

Singh, Utkarsh, Arora, Naveen Kumar, and Sachan, Preeti

Abstract

Discharge of coke-oven wastewater to the environment may cause severe contamination to it and also threaten the flora and fauna, including human beings. Hence before dumping it is necessary to treat this dangerous effluent in order to minimize the damage to the environment. Conventional technologies have inherent drawbacks however, biological treatment is an advantageous alternative method. In the present study, bacteria were isolated from the soil collected from the sites contaminated by coke-oven effluent rich in phenol and cyanide. Nucleotides sequence alignment and phylogenetic analysis showed the identity of the selected phenol and cyanide degrading isolates NAUN-16 and NAUN-1B as Pseudomonas putidaand Pseudomonas stutzeri, respectively. These two isolates tolerated phenol up to 1800mgL−1and cyanide up to 340mgL−1concentrations. The isolates were immobilized on activated charcoal, saw dust and fly ash. The effluent was passed through the column packed with immobilized cells with a flow rate of 5mLmin−1. The isolates showed degradation of phenol up to 80.5% and cyanide up to 80.6% and also had the ability to reduce biological oxygen demand, chemical oxygen demand and lower the pH of effluent from alkaline to near neutral. The study suggests the utilization of such potential bacterial strains in treating industrial effluent containing phenol and cyanide, before being thrown in any ecosystem.

Published
2018
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