International Journal of Pharma and Bio Sciences
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editorijpbs@rediffmail.com (or) editorofijpbs@yahoo.com (or) prasmol@rediffmail.com
10.22376/ijpbs.2019.10.1.p1-12
Volume 3 Issue 2
2012 (April - June)
Color And Phenols Removal From Paper Mill Effluent By Sequential Treatment Using Ferric Chloride And Pseudomonas Putida
A two-step sequential treatment method to remove color and phenols from paper mill effluent was investigated in the present study. First step in the treatment involved chemical precipitation of effluent using ferric chloride as a precipitating agent. The chemical precipitation using 2.0 gL lessThan sup greaterThan -1 lessThan /sup greaterThan of ferric chloride at pH 4.0 removed 99% of color, 42% of phenols, 97% of total suspended solids (TSS) and 53% of chemical oxygen demand (COD) from the effluent. However, the treatment imparted a residual concentration of 30 mgL lessThan sup greaterThan -1 lessThan /sup greaterThan of Fe(III) ions in treated water. In second step, the effluent treated with ferric chloride was subjected to further treatment using the bacteria lessThan i greaterThan Pseudomonas putida lessThan /i greaterThan . lessThan i greaterThan P. putida lessThan /i greaterThan adsorbed the residual Fe(III) ions to a below dischargeable level of 1.0 mgL lessThan sup greaterThan -1 lessThan /sup greaterThan in two days of incubation. At the end of two-step sequential treatment 99.8% of color, 98.8% of phenols, 98% of TSS and 94% of COD were reduced from the effluent. The two-step sequential treatment effectively reduced the pollutants from paper mill effluent to the disposable levels. Further, the impact of sequentially treated effluents on germination of bengal gram seeds was also studied to understand the utility value of the treated effluents in agriculture. The bengal gram seeds grown on sequentially treated effluent showed better growth with high seed vigor index and low percentage of inhibition indicating the complete removal of toxicity from effluent during the treatment. The study concludes that the proposed sequential method may be effectively used as an alternative tertiary treatment method for remediation of paper mill effluent.
N. Kumara Swamy , Pratibha Singh And Indira P.Sarethy
Paper mill effluent, Chemical precipitation, Sequential treatment, Bioaccumulation
380-392