The aim of this study is to investigate the performance of batch electro coagulation (EC) using iron electrodes with bipolar configuration for simultaneous removal of chromium (Cr3+) from synthetic wastewater. The influences of current density (from
2 to 25 mA/cm2), initial metal concentration (from 100 to 250 mg/L) and supporting electrolyte (0-12 mmol/L Na2SO4) on removal efficiency are explored in a batch stirred cell to determine the best experimental conditions.
The results indicate that EC was very efficient to remove Cr3+ from the synthetic wastewater having an initial concentration of 250 mg/L of Cr3+ under the best experimental conditions. At the current density of 15 mA/cm2 with a total energy consumption of ∼18.5 kWh/m3, more
than 98.7% removal value was achieved for Cr3+ after 20 min EC treatment. Time of 20 minutes EC treatment was chosen as optimum time to gain less than 4 mg Fe/L in the treated water.
Fresh water shortage problem is the most important difficulty that counters agricultural and industrial
improvement strategies on both Arabic and international levels, where Arabian region extends along vast
arid and semi- arid areas, and mostly la
cks for fresh water resources. Therefore, desalination choice has
become an inevitable option to compesate deficiency of water, especially with the long Arabian costal line,
where desalinated seawater is considered renewable fresh water resource.
However, desalination mechanism requires water pretreatment procedures in order to reduce total
hardness and pH values, to prevent salts precipitations which hinder thermal and membrane techniques.
In this work, the performance of batch electrocoagulation (EC) treatment using iron electrodes with
monopolar configuration for trivalent chromium (Cr3+) removal from a synthetic wastewater was
investigated. The influences of current density (from
2 to 25 mA/cm2) and initial metal concentration
(from 50 to 250 mg/L) on the removal efficiency were explored in a batch stirred cell to determine the
best experimental conditions.
The purpose of this study was to evaluate the success of Formocresol
pulpotomy compared with Ferric sulfate and Electro coagulation and Laser
pulpotomy in primary teeth. Fourty seven primary second molars of
children aged 5-8 years, were divided r
andomly into four groups: 10
Formocresol , 13 Ferric sulfate , 13 Electro coagulation, 10 Laser.
All teeth were filled with ZOE and sealed with Compomer, and S.S.Crown
as final restoration.
The success rate was 90 % - 84.6 % - 84.6 % - 83.3 % respectively.
These differences were not statistically significant p=0.05), but there were a
relation between the pretreatment physiologic resorption of roots and the
type of hemorrhage during the amputation procedure.
This study revealed that Ferric sulfate, and Electro coagulation, and Laser
pulpotomy are good alternative to Formocresol pulpotomy.
In this work, the performance of batch electrocoagulation (EC) treatment using iron
electrodes with monopolar and bipolar electrode configurations for trivalent chromium (Cr
(III)) removal from a synthetic wastewater was investigated. The influence
s of current
density (from 2 to 25 mA/cm2) and initial metal concentration (from 100 to 250 mg/L) on
the removal efficiency were explored in a batch stirred cell for monopolar and bipolar
configurations.
Removal of Cr (III) by EC process from aqueous solution with both monopolar and
bipolar electrode configurations was a feasible process. For the initial Cr (III)
concentration of 250 mg/L, almost complete removal (99.88%) of Cr (III) was noted after
20 min of EC in case of bipolar electrode arrangement at 25 mA/cm2 with 4.5 mmol/L of
supporting electrolyte (Na2SO4) against 89.58% of Cr (III) removal for monopole electrode
configuration.
At the same electrolysis time, the power consumption was 47 and 15.3 kWh/m3 in
case of monopolar and bipolar configuration respectively for the previous removal
conditions.
