Journal of Engineering

The Algae is considered as one of the major causes of some serious problems that occur in
water plants, rivers, lakes and irrigation channels. Those problems are the unpleasant taste and odor, the clogging of waterways, and others. Hence, the algae existing extensively in any water body is considered as an obvious indication of surface water pollution. Chemical control methods were used in this research for reducing the turbidity and Algae in the laboratory using the (Jar Test). This was done by using chemical materials like Alum with concentration (10 - 50 mg/l). The percentage of the reduction in the algae was (95%) and in turbidity (94%). It is shown also that when using KMnO4, CuSO4 and Cl, each separately after adding the ideal dose of alum found before, will reduce the turbidity with ( 95% ,79.3% .95%) and algae removal of (99.2%, 100%, 99%) respectively

De-waxing of lubricating oil distillate (400-500 ºC) by using urea was investigated in the
present study. Lubricating oil distillate produced by vacuum distillation and refined by furfural
extraction was taken from Al-Daura refinery. This oil distillate has a pour point of 34 ºC. Two solvents
were used to dilute the oil distillate, these are methyl isobutyl ketone and methylene chloride. The
operating conditions of the urea adduct formation with n-paraffins in the presence of methyl isobutyl
ketone were studied in details, these are solvent to oil volume ratio within the range of 0 to 2, mixer
speed 0 to 2000 rpm, urea to wax weight ratio 0 to 6.3, time of adduction 0 to 71 min and temperature
30-70 ºC). Pour point of de-waxed oil and yield of wax produced were determined to show the effect of
these operating conditions. The most favorable operating conditions were solvent to oil volume ratio of
1, mixer speed of 1500 rpm, urea to wax weight ratio of 5, time of adduction of 13 min and
temperature of 30-52 ºC

Experiments were carried out to study the local and average heat transfer by natural convection in
a vertical concentric cylindrical annulus. The experimental setup consists of an annulus has a radius ratio of 0.555 and inner cylinder with a heated length 1.2m subjected to the constant heat flux while the outer cylinder is subjected to the ambient temperature. The investigation covers heat flux range from 58.2 W/m2 to 274.31 W/m2. Results show an increase in the natural convection as heat flux increases leads to an improve in the heat transfer process. An empirical equation of average Nusselt number as a function of Raylieh number was deduced

Cathodic protection is a corrosion-prevention technique which uses the electrochemical properties of metals to insure that the structure to be protected becomes the cathode of an electrolytic cell.
Laboratory evaluation was conducted on zinc electrode as anode material that used for sacrificial anode cathodic protection (SACP)of carbon steel.
Rate of zinc consumption during cathodic protection of carbon steel pipeline carrying seawater (4 % w/v NaCl solution) were measured by the loss in weight technique. Variables studied were seawater temperature (0-45o C), flow rate (5-900 lit/h), pH (2-12) and duration time (1-4 h). It was found that the rate of zinc consumption increases with increasing seawater temperature, flow rate and duration time and decreases with pH increase. Under the mentioned operating conditions, the rate of zinc consumption during cathodic protection of steel ranged from 5.65×10-3 to 98.9×10-3 g/cm2.day.
For the system under investigation, the cell responsible for cathodic protection is Zn/NaCl/Fe.