Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Electrocoagulation

Ultrasonic Technique in Treating Wastewater by Electrocoagulation

Najem A. Al-rubaiey; Mohammed G. Al-Barazanjy

Engineering and Technology Journal, 2018, Volume 36, Issue 1C, Pages 54-62
DOI: 10.30684/etj.36.1C.9

Electrocoagulation Treatment can be considered as a favorable tool for the removal of many pollutants of various forms of wastewater. These pollutants may include the removal of colloidal, the breaking-up of emulsions and heavy metals. This process consists of the disintegration of the anodes (usually iron or aluminum), exciting the creation of coagulant mixtures in wastewater. That will aid to coagulate contaminants and generate bubbles in favor of mixing and elimination of solids suspension by flotation. Recently, the arrangement of using this technique with other treatment tools has turned out to be an interesting subject leading to an improvement in the removal efficiency of the treatment. In this study, a combined treatment of electrocoagulation and ultrasound has been applied to treat three most common wastewaters in oil industry. The ultrasound-electrocoagulation removal efficiencies for the removal of oil, suspended bentonite and zinc have been evaluated here. In this work, a synthetic wastewater would be treated using electrocoagulation technique to reduce turbidity caused by pollutants. This process has been done in a batch reactor equipped with aluminum/iron electrodes with and without agitation. The effects of one of the most important parameter, i.e. applied voltage on turbidity have been studied. In addition, the effect of using ultrasonic has been also evaluated. It was found when ultrasonic used with electrocoagulation, the turbidity increased for suspended bentonite and oily wastewaters and an improvement in removal efficiency for the heavy metals pollutants. The results were compared and discussed.

Performance Evaluation of Electrocoagulation Technique for Removing Groundwater Hardness of Tikrit University

Maha I Alali

Engineering and Technology Journal, 2012, Volume 30, Issue 18, Pages 3268-3279
DOI: 10.30684/etj.30.18.12

The performance of Electrocoagulation (EC) process for removal of hardness in
groundwater(GW) of Tikrit University in Salahaddin province, north of Baghdad in
Iraq has been studied using aluminum (Al)electrodes with both bipolar and
monopolar configurations. The effect of initial pH, applied voltage(U), electrolysis
time(t), and electrodes configurations on the performance of EC has been
investigated. It was found that the best initial pHvalue to remove hardness(HD)was
9.5. The results indicated that increasing U and t had a positive effect on the
hardness removal efficiency(%Ehardness ) to reach 90.4%andit was influenced by the
electrodes configuration in which %Ehardness was 83.5% in bipolar connection
compared with 66.2%in monopolar connection.Also The electrical energy
consumption%Ehardness and the experimentally and theoreticallyelectrodes
consumption (Wexp ) and (Wtheo )were calculated.It was absorbed,as determined, that
there is no significant difference between pseudo-first and second-order kinetic
model except at 40 volt that the pseudo second-order kinetic model fits better than
the first-order kinetic model with the data of the electrocoagulation process. Finally
the cost at themost favorable conditions for EC process was calculatedresulting that
the electrocoagulation process is successfully applied to remove the hardness rate
from groundwater with high performance.

Boron Removal from Shat Al-Arab River Water Using Electrocoagulation

Saadi K. Al-Naseri

Engineering and Technology Journal, 2012, Volume 30, Issue 13, Pages 2175-2185
DOI: 10.30684/etj.30.13.2

Shat Al-Arab is a river located at the south of Iraq. Boron concentration has
increased significantly recently due to the drought season which makes water from
the Arabian Gulf pour into Shat Al-Arab. Boron concentration, as high as 5 mg/l,
was detected in this river. This is 10 times the allowable drinking water concentration
for boron according toWHO and the Iraqi drinking water guidelines, i.e. 0.5 mg/l.
Experiments were conducted to determine the ability of electrocoagulation
technique to reduce boron concentrations in synthetic water of 5 mg Boron/l and
conductivity of 2000 μS/cm to the required level in drinking water. Experimental
setup was prepared to determine the effects of several operating parameters on the
optimum operation for the electrocoagulation. In addition, the technique was
compared with chemical coagulation, using Poly-Aluminum-Chloride, Aluminum
Sulphate, and Ferric Chloride.
The experiments revealed that chemical coagulation has a very low efficiency
(about 12%) that renders it unsuitable as a pretreatment for existing (or for the future)
desalination units. On the other hand, electrocoagulation experiments showed a
maximum boron removal efficiency of 40% at a current density of 5 mA/cm2,
operating time of 30 minutes, and pH of 8.