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Register a new userElectrocoagulation with bipolar iron electrodes for trivalent chromium removal from synthetic wastewater
دراسة عملية التخثير الكهربائي باستخدام أقطاب الحديد الكهربائية ذات الوصل الثنائي لإزالة الكروم الثلاثي من مياه الصرف التركيبية
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بسام العجي( باحث )
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هدف هذه الدراسة هو اختبار فعالية عملية التخثير الكهربائي الدفقي باستخدام أقطاب الحديد الكهربائية ذات الوصل الثنائي في إزالة الكروم ثلاثي التكافؤ Cr+ 3 من مياه الصرف التركيبية. اخُْتِبر تأثير كل من كثافة التيارالكهربائي (ضمن المجال من 2 و حتى 25 ميلي أمبير/سم 2)، و تركيز الكروم الأولي (ضمن المجال من 100 و حتى 250 مغ/ل)، و تركيز الالكتروليت الداعم (ضمن المجال من 0 و حتى 12 ميلي مول /ل Na2SO4)في كفاءة إزالة الكروم في خلية دفقية تحت التحريك؛ و ذلك بهدف تحديد أفضل الشروط التجريبية لهذه العملية. تشير النتائج إلى أن عملية التخثير الكهربائي هي عملية فعالة جدًا في إزالة الكروم Cr+ 3 من مياه الصرف التركيبية الحاوية على تركيز أولي من الكروم يصل حتى 250 مغ/ل؛ و ذلك عند اختيار أفضل الشروط التجريبية لهذه العملية. جرى الحصول على إزالة للكروم تفوق % 98.7 لدى استخدام كثافة تيار كهربائي قدرها 15 ميلي أمبير/ سم 2 حيث كان استهلاك الطاقة الكلي نحو 18.5 كيلو واط ساعي/م 3؛ و ذلك بعد 20 دقيقة من المعالجة. واخُْتِبر زمن 20 دقيقة من المعالجة بهدف جعل تركيز الحديد في المياه بعد المعالجة أقل من 4 مغ/ل. أجريت التجارب خلال مهمة البحث العلمي إلى تركيا في قسم الهندسة البيئية بجامعة الأناضول في المدة من نيسان إلى آب 2010.
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.
References used
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
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
Y.X. Liu, D.X. Yuan, J.M. Yan, Q.L. Li, T.Ouyang, Electrochemical removal of chromium from aqueous solutions using electrodes of stainless steel nets coated with single wall carbon nanotubes, J. Hazard. Mater. 186 (2011) 473–480
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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.
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.
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).
Fixed bed adsorption columns packed with natural zeolite were used to study the
kinetics of heavy metals removal from the single component solutions of Vanadium, Nikle,
Zinc, and Lead. The system parameters studied include solution flow rate and be
d height.
The effect of competing cations was also studied to establish the effectiveness of natural
zeolite in treating Industrial wastewater under continuous conditions using fixed bed
columns. The metal loaded natural zeolite was regenerated using NaCl . The results from
column studies showed that the Slower flow rates gave better removal efficiencies
compared to faster ones, Longer bed heights also resulted in greater adsorption
efficiencies. The bed depth service time (BDST) model was successfully used to simulate
experimental results at 30 % breakthrough. This model provides the necessary parameters
needed for fixed bed column design, the factor R2 ranged between 0.91 – 0.95. Natural
zeolite was exposed to 3 cycles of adsorption and desorption. The efficiency of the column
in removing heavy metals was high, The results indicate that natural zeolite can be
regenerated and re-used in removing heavy metals from solution.
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