1. Impact of Operating Parameters on the Nitrate Removal by Nanofiltration

    Ali Rıza Dinçer, Tarık Uçar

    Department of Environmental Engineering, Namık Kemal University, Çorlu, Tekirdağ, Turkey.

    Abstract:

    The removal of NO3– from synthetic water has been studied using two different nanofiltration (NF) membranes(GE Osmonics DK and, GE Osmonic DL). Nitrate removal efficiencies of two different nanofiltration membranes investigated by means of a lab-scale membrane module in synthetic nitrate solutions that have different concentration. The impact of principle working parameters, for example, NO3– concentration, pH, and pressure and permeate flux of both membranes, was examined.

    The outcomes demonstrated that the dismissal of NO3– and the flux rate for all membranes (DK and DL) expanded directly with the trans-membrane pressure and diminished with the NO3– concentration. Nitrate rejection rate for the DL membrane was between approximately 23% and 30% . Under the same pressure (6 bar), the DK membrane generated a higher nitrate rejection rate (42%-55%) than the DL membrane. And also, rejection levels for 12 bar pressure achieved by DK have been in range of 63-69%, while DL gives the lowest rejection in the range of 29-30%.

    The wide range change of the pH from 4 to 11 of the feed did not alter nitrate rejection very much for DK and DL membranes. Nitrate rejection for DL and DK membranes decreases by increasing feed concentrations and filtration time.

    Keywords: Nanofiltration, Synthetic water, Nitrate removal, DK and DL membranes

    Pages: 41 – 57 | Full PDF Paper

  2. A Environmental Friendly Insect is Tenebrio molitor (Tenebrionidae: Coleoptera)

    Engin KILIÇ

    Erzincan University, Faculty of Pharmacy, Department of Basic Pharmacy Sciences.

    Abstract: Tenebrio molitor is a species of darkling beetle (Tenebrionidae: Coleoptera), which produces larvae that are commonly called mealworms. Acting as decomposers in the natural environment, they feed on decaying plant materials and dead insects. As a result of its easy handling and non-fastidious culture conditions, T. molitor is used as a pet food, an educational material, and as a biological research model. As a result, we reported that, 20 larvae of  T. molitor eat 1g, at first box, others respectively 2g, 2g, and 1g. They eat 0.014g at first box and others respectively 0.028g, 0.028g and 0.014g a day. Acording to our result of our studay, we can use this insect as a styrofoam degredation.

    Keywords: Tenebrio molitor, styrofoam degredation, environment, alternative

    Pages: 58 – 62 | Full PDF Paper