Authors
Abstract
The industrial wastewater discharge from the North Oil Company causes a
high industrial water pollution to the agricultural lands. The present study
aims to find the possibility method for treating such industrial oily
wastewater, by coagulation-flocculation and sedimentation.
The experimental test will deal with the characteristics and analysis of
wastewater such as turbidity, pH, TDS, T.H, and oil concentration. Also it
deals with the effect of coagulation, flocculation, and sedimentation on the
removal efficiency of oil in wastewater and other parameters. Four types of
coagulation were used. The experimental was carried out by using Jar-test
(flocculator laboratory scale).The behavior of flocculent settling was studied
in sedimentation column.
It is found from the experimental results of Jar test, the optimum alum
dosages are. (25,40,70 ppm), FeCl3 dosages are (4,8,20 ppm), CaO dosage are
(7,15,30 ppm) and clay dosage are (2.5,5,9 g/L) for initial oil concentration
(30,58,136 ppm) respectively.
The experimental results are represented by mathematical empirical
correlation for used coagulants alone and in combination as follows
R%= 66.23+ 0.326 DA + 1.17 DF + 0.85 Dc + 6.342 DL + 0.383 C0 - 0.0026 DA
2
+0.302DF
2 – 0.013DC
2- 0.496 DL
2 + 00.017 C0
2
From the polynomial equations and graphical figures it was found the oil
removal efficiency is a function of alum, FeCl3, CaO and clay dosage and
initial oil concentration. The result of sedimentation column was indicated
that the combination of doses improves the removal efficiency and settling
time. The above equation shows the removal efficiency of oil decreases with
increases of initial concentration.
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