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Register a new userElectrocoagulation of chromium containing synthetic wastewater using monopolar iron electrodes
دراسة عملية التخثير الكهربائي لمياه الصرف التركيبية الحاوية على الكروم باستخدام أقطاب الحديد الكهربائية ذات الوصل الفردي
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بسام العجي( باحث )
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اختُبرتْ في هذا البحث فعالية عملية التخثير الكهربائي الدفقي، باستخدام أقطاب الحديد الكهربائية ذات الوصل الفردي، بهدف إزالة الكروم ثلاثي التكافؤ +3 Cr من مياه الصرف التركيبية. جرت دراسة تأثير كل من كثافة التيار الكهربائي (ضمن المجال من 2 و حتى 25 ميلي أمبير/سم 2) و تركيز الكروم الابتدائي (ضمن المجال من 50 و حتى 250 مغ/ل) في كفاءة إزالة الكروم في خلية دفقية مضطربة؛ و ذلك بهدف تحديد أفضل البارامترات التجريبية لهذه العملية.
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.
References used
F. Gode, E. Pehlivan, Removal of chromium(III) from aqueous solutions using Lewatit S 100: The effect of pH, time, metal concentration and temperature. J. Hazard. Mater. 136(2006) 330 337
D. Bagchi, S.J. Stohs, B.W. Downs, M. Bagchi, H.G. Preuss, Cytotoxicity and oxidative mechanism of different form of chromium, Toxicology 180(2002) 5 22
A.R. Iftikhar, H.N. Bhatti, M.A. Hanif, R. Nadeem, Kinetic and thermodynamic aspects of Cu(II) and Cr(III) removal from aqueous solutions using rose waste biomass, J. Hazard. Mater, 161 (2009) 941 947
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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.
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.
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 the present work, batch electrocoagulation experiments were carried out
to evaluate the removal of polycyclic aromatic hydrocarbon (PAHs) from water
using aluminum electrodes. The effects of initial pH, current density,
electrolysis time, initi
al concentration of PAHs, electrolyte type, and electrolyte
concentration were investigated to achieve the optimal removal efficiency. The
results indicated that the electrocoagulation utilizing the aluminum, as anode
and cathode, was an efficient tool in the reduction of these contaminants. The
treatment process was found to be largely affected by the current density and
the initial composition of water. The removal rate was significantly increased
using NaCl as an electrolyte where indirect oxidation by hypochlorite forming
later during the treatment was occurred. The results demonstrated that the
technical feasibility of the electrocoagulation as a possible and reliable
technique for the treatment of PAHs contaminants in water.
This research aims to:
Determination of optimal pH values to reach the highest
efficiency of chromium removal in industrial wastewater from
tanneries by chemical deposition.
Access to close concentration of the permitted
concentration of chromium in treated tannery wastewater
according to Syrian Standard No. 2580/2002 (Table 1).
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