Browsing by Author "Rahman, M. A"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    INTEGRATION OF TECHNOLOGIES TO IMPROVE THE PHARMACEUTICALS WASTE MANAGEMENT IN BANGLADESH
    (Daffodil International University, 2010-07-01) Hossain, K. M. Z.; Rahman, M. A; Sharif, N.; Haque, S.M.E.
    An investigation was carried out to minimize the pollution load of pharmaceuticals industries by using integrated waste management technologies. Effluents were physically, chemically and biologically treated using three-stages advanced effluent treatment system. The dust particles were discharged to the atmosphere after filtration and the solid wastes were burnt in a pyrolytic incinerator at about 1100oC temperature. The physico-chemical characteristics of treated effluent were measured using Ultra Violet-Visible spectrophotometer and the emitted dust particles were analyzed using High Performance Liquid Chromatography (HPLC) to determine the discharge amount. The biological oxygen demand, chemical oxygen demand, total dissolved solid, chloride and sulphide contents of the treated effluent were found within allowable limit. The dust particles were also emitted to the environment below 0.5 mg/L. The solid wastes were reduced to 25% by volume after combustion. It was found that integrated waste management system of pharmaceutical industries can minimize the pollution load to ensure a safe ecological environment.
  • Thumbnail Image
    Item
    OPTIMUM FLYASH TO INCREASE THE STRENGTH OF SUBGRADE
    (Dept. of CE, CUET, 19-Dec-2018) Sarker, A.; Iqbal, M. B.; Rahman, M. M.; A-Noor, M. C.; Rahman, M. A; Islam, M. R.
    Stabilization of problematic soils with fly ash not only improves engineering properties of soil but also provides a solution to challenges of fly ash disposal. Approximately 52,000 tons of fly ash produced annually at Boropukuria coal-based power plant in Bangladesh require a huge disposal area and create environmental problems. This paper reports the results of laboratory investigation carried out on expansive soil collected from Rajendrapur area stabilized with fly ash in varying percentages. Here, 4% cement is used as an activator. The effect of cement with varying fly ash contents are correlated with soaked California bearing ratio (CBR) value, swelling index and Atterberg limits of stabilized soil. The study finds that soaked CBR value of the soil improves from 1.73% to 26.07% after adding 6% of fly ash for 14 days of curing. With increasing of more fly ash content, strength decreases. So optimum value of fly ash content is 6% for which highest strength is obtained. Moreover, swelling index of the collected soil with 4-days soaking condition is found to be decreased by 47% when 6% fly ash is added. The outcome of this study will guide road engineers of Bangladesh to use fly ash as a stabilizing agent to improve the properties of subgrade