Electrocoagulation process to Chemical and Biological Oxygen Demand treatment from carwash grey water in Ahvaz megacity, Iran

In this work, we present the result of an electric coagulation process with iron and aluminum electrodes for removal of chemical and biological oxygen demand (COD and BOD) from grey water in different car washes of Ahvaz, Iran. Nowadays, one of the important dangerous that can contaminate water resources for drinking, agriculture and industrial is Car wash effluent [1,2]. In this study, initial COD and BOD concentration, pH of the solution, voltage power and reaction time was investigated. The concentration level of remaining COD and BOD in samples was measured, using DR/5000 UV–vis HACH spectrophotometer [3,4]. The effects of contact time, initial pH, electrical potential and voltage data on removal of COD and BOD were presented. Statistical analysis of the data was carried out using Special Package for Social Sciences (SPSS 16).


a b s t r a c t
In this work, we present the result of an electric coagulation process with iron and aluminum electrodes for removal of chemical and biological oxygen demand (COD and BOD) from grey water in different car washes of Ahvaz, Iran. Nowadays, one of the important dangerous that can contaminate water resources for drinking, agriculture and industrial is Car wash effluent [1,2]. In this study, initial COD and BOD concentration, pH of the solution, voltage power and reaction time was investigated. The concentration level of remaining COD and BOD in samples was measured, using DR/ 5000 UV-vis HACH spectrophotometer [3,4]. The effects of contact time, initial pH, electrical potential and voltage data on removal of COD and BOD were presented. Statistical analysis of the data was carried out using Special Package for Social Sciences (SPSS 16 KO 4 ) and 3-methyl-2-benzothiazoline, then it was stored in a dark place at 4°C temperature until the metals analysis -The effects of contact times, initial pH, electrical potential and voltage were examined.

Experimental features
Electrocoagulation between many treatment processes having to be cost-effective for wastewater treatment with pollutant wide range. Data source location Ahvaz, Iran Data accessibility Data is with this article.

Value of the data
These data describe changes in COD and BOD removal from grey water by electrocoagulation process.
Data show that electrocoagulation can be used as cost-effective for removal of other pollutant from wastewater.
Data of this study can be used to design the electrocoagulation experiments for removal of wide range of pollutant in wastewater.
Data are important for discharge environment especially resource water, aqueous and agriculture.

Data
In this article the data in Table 1 present the measured parameters and characteristics of the raw grey water that used for description of experiments. Calculated values of K (1/min) and kWh/m 3 in the grey water effluent are reported in Table 2. Figs. 1 and 2 show data of different arrangements under optimal conditions applied in this study. The maximum removal efficiency (90.18%) of COD and BOD was obtained at optimum pH ¼7, level of 30 voltage, and contact time of 90 min. The effects of optimum parameters on removal efficiency of COD and BOD are shown in Fig. 3.

Sample collection and analytical procedures
Our data set was obtained from All Car washes. The raw grey water was obtained along the Ahvaz in Iran. The initial concentration of samples has been tested for determination of COD and BOD. To    adjust the primary pH of the solution, the sulfuric acid and one-tenth normal sodium hydroxide were used. A lab-scale reactor with diameters of 15 cm Â 15 cm Â 15cm was used for performing experiments. Sulfuric acid (H 2 SO 4 ), potassium dichromate (K 2 Cr 2 O 7 ), mercury sulfate (HgSO 4 ), silver sulfate (Ag 2 SO 4 ), potassium hydrogen phthalate (C 8 H 5 KO 4 ), 3-methyl-2-benzothiazoline hydrazine were used for preparing COD and BOD solutions in grey water. Steering time of 30, 60 and 90 min, voltage values of 10, 20 and 30 v were used in this study. At each experiment, removal efficiency of COD and BOD in grey water with special Al-Al, Al-Fe, Fe-Fe electrode was investigated. Spectrophotometer (DR/5000 UV-vis HACH) was used to investigate the remaining concentration level of COD and BOD in the grey water effluent [5]. Following equation was applied to calculate the electrocoagulation electrical energy consumption during experiments [4,5].
where: U is voltage used in the process (V), I is intensity of the applied current (A), t is reaction time (min) and V r is reactor volume (Lit).