Search

The current study aimed to investigate the elimination of dyes from sewerage, using microfiltration membrane mechanism. Three dyes were applied, acid yellow-23, disperse blue -79 and acid orange -7. Experiments were performed with feed concentration (40 -120) ppm, feed flow rate (25 -65) l/h and time (0.25 -1.5) h. The membrane used ceramic membrane, constructed as a candle. It was discovered that water flow diminishes with an elevation in running time, feeding oil concentration and enhancing with elevation in the feed flow rate. In addition, it was determined that the elimination (rejection) rate of dyes enhances with elevation in the flow rate, and the elimination (rejection) rate diminishes as time passes. In cross flow microfiltration, the rejection concentration (concentrate) goes up as time passes, with high feed concentration and flow rate. It was also discovered that the modal infusion concentration declines with high feed concentration and working time. In addition, it was found that product rate goes down as time passes and with high feed concentration. Increasing feed concentration of dyes was associated with an increase in the concentration of rejecting solution. The highest elimination of disperse blue -79, Acid Yellow- 23 and acid orange -7, are 97%, 96.4% and 95.8%, respectively. The maximum recovery percentage of disperse blue - 79, acid yellow- 23 and acid orange -7are 57.7%, 58.5% and 59% respectively.

The aim of this study is to use the dry fibers of date palm as low-cost biosorbent for the removal of Cd(II), and Ni(II) ions from aqueous solution by fluidized bed column. The effects of many operating conditions such as superficial velocity, static bed height, and initial concentration on the removal efficiency of metal ions were investigated. FTIR analyses clarified that hydroxyl, amine and carboxyl groups could be very effective for bio-sorption of these heavy metal ions. SEM images showed that dry fibers of date palm have a high porosity and that metal ions can be trapped and sorbed into pores. The results show that a bed height of 6 cm, velocity of 1.1Umf and initial concentration for each heavy metal ions of 50 mg/L are most feasible and give high removal efficiency. The fluidized bed reactor was modeled using ideal plug flow and this model was solved numerically by utilizing the MATLAB software for fitting the measured breakthrough results. The breakthrough curves for metal ions gave the order of bio-sorption capacity as follow: Cd(II)]Ni(II).

Control of galvanic corrosion of steel–brass couples in petroleum waste water solution by Curcuma longa was studied at different temperatures, inhibitor concentrations, and velocities using the electrochemical polarization technique. Inhibition efficiency was increased with the increase in inhibitor concentration and decreased with both rises in temperature and solution velocity. Maximum inhibitor efficiency was 94.9% in static solution, higher level of inhibitor concentration and lower level of temperature. The adsorption of Curcuma longa obeyed a Langmuir adsorption isotherm by formation of spontaneous physical layer on the metal surface. Scanning electron microscopy of the metal surface revealed that damage was lower in the presence of Curcuma longa. Activation studied via Arrhenius equation showed that the adsorb layer on the surface increases the energy barrier for corrosive dissolution which is also supported by the higher values of activation energy. Mathematical and statistical analyses were also used as a successful tool to correlate the corrosion rate data with operating conditions.

Corrosion control of mild steel in seawater solution using Tobacco Leaf Extract (TLE) is investigated at different inhibitor concentration and temperature by weight loss method. Inhibitor performance increases with a decrease in temperature and increases with the rise of inhibitor concentration. Adsorption acts in accordance with Freundlich adsorption isotherm, having negative values of adsorption in high temperature, signifying a spontaneous and stable course of inhibition. In order to construct a relationship between the corrosion percentage data and independent variables, mathematical models were proposed with high correlation coefficients. Following the AM1-SCF method, quantum chemistry specifications of inhibitor were computed, for activation of the adsorption of the TLE molecules on the steel exterior.

Galvanic corrosion of steel–copper couple in saline petroleum wastewater in the absence and presence of curcuma extract as corrosion inhibitor was studied as a function of temperature, velocity, and inhibitor concentration. The electrochemical polarization technique was used to evaluate the corrosion parameters. Corrosion currents densities increase with temperature and velocity, while it decreases with inhibitor concentrations. In this investigation, a theoretical model equation was used to analyze the shape of polarization curves. Microsoft Excel program was used to find the galvanic current and galvanic potential. Theoretical results agreed with experimental one.

The inhibition of steel–copper couple galvanic corrosion in petroleum waste water solution by Curcuma longa was studied at different temperature and different cathode to anode ratios using weight loss technique. Inhibition efficiency was increased with increase in inhibitor concentration but decrease with rise in temperature. Adsorption followed the Temkin isotherm with negative values of Δ G ads ∘ , suggesting a stable, and spontaneous inhibition process. Mathematical equations were suggested to represent the corrosion rate data with high correlation coefficients. Quantum chemical parameters were calculated for inhibitors using the AM1-SCF method to simulate the adsorption of the C. longa molecules on couple surface.