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Publications (3)10.08 Total impact

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    ABSTRACT: There is a great volume of polluted soil by 2,4,6-trinitrotoluene (TNT) manufacturing wastewater containing dozen of nitrocompounds in China. In this study, biostimulation was used for remediating the explosive-polluted soil in aerobic bioslurry by monitoring the removal of total organic carbon (TOC). The results showed that the pulp density had almost no effect on TOC removal; whereas the acetone addition evidently improved remediation efficiency of the polluted soil by intrinsic microorganism, and the TOC removal increased from 25% to 38.4% when dose of acetone increased from 0% to 4% (v/v). The maximum TOC removal of 49.1% was achieved through further adjusting pH at 9.0 and temperature at 30 °C. The second order reaction fits well removal dynamics of TOC under the optimum conditions. With the average conditions, liquid phase TOC decreased from 3404 to 3144 mg/L and solid phase TOC dropped from 1022 to 104 mg/L, leading to toxicity decline by 35%; the optimum condition witnessed 48.9% of TOC removal from 4500 to 2300 mg/L in liquid phase, causing toxicity drop by 62%.
    Journal of Physics Conference Series 06/2013; 439(1):2047-.
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    ABSTRACT: In this work, bioleaching was used to extract valuable Zn and Mn from spent Zn-Mn batteries. The results showed that 96% of Zn extraction was achieved within 24h regardless of energy source types and bioleaching bacteria species. However, initial pH had a remarkable influence on Zn release, extraction dose sharply decreased from 2200 to 500mg/l when the initial pH value increased from 1.5 to 3.0 or higher. In contrast to Zn, all the tested factors evidently affected Mn extraction; the maximum released dose of 3020mg/l was obtained under the optimum conditions. The acidic dissolution by biogenic H(2)SO(4) by the non-contact mechanism was responsible for Zn extraction, while Mn extraction was owed to both contact/biological and non-contact mechanisms. The combined action of acidic dissolution of soluble Mn(2+) by biogenic H(2)SO(4) and reductive dissolution of insoluble Mn(4+) by Fe(2+) resulted in 60% of Mn extraction, while contact of microbial cells with the spent battery material and incubation for more than 7days was required to achieve the maximum extraction of Mn.
    Bioresource Technology 12/2011; 106:147-53. · 5.04 Impact Factor
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    ABSTRACT: In the present paper, a feasible method was developed to grow fungal pellets in an air lift column reactor inoculated with mycelium fragments for improving separation effect of biomass from solution and reducing clogging effect of biomass; bioaccumulation of dye by the growing fungal pellets in the case of mycelium fragments inoculation was investigated. The results showed that inoculation with the mycelium fragments without any pre-treatment did not witness the formation of pellets; only pre-treated fragments using maize as both nucleus and carbon source for 72 h incubation guaranteed the formation of pellets in the air lift column reactor. Nearly 100% of dye removal was obtained by bioaccumulation of the growing pellets in successive three batches of dye wastewater treatment. The formation of pellets not only resulted in low clogging effect to promote mass transfer and dye bioaccumulation but also caused quick separation of dye-loaded biomass from treated wastewater.
    Bioresource Technology 11/2011; 105:100-5. · 5.04 Impact Factor