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Register a new userA Comparison Between monopolar and bipolar Electrode configurations on Removal of chromium from synthetic wastewater by Electrocoagulation Process
مقارنة فعالية إزالة الكروم من مياه الصرف التركيبية باستخدام الوصل الفردي و الوصل المزدوج لأقطاب المخثر الكهربائي
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Tishreen University ورقة بحثية
Publication date
2016
fields
Environmental Engineering
and research's language is
العربية
Authors
بسام العجي( باحث )
Created by
Shamra Editor
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تم في هذا البحث اختبار أداء عملية التخثير الكهربائي الدفقي باستخدام أقطاب الحديد الكهربائية ذات الوصل الفردي و المزدوج، بهدف إزالة الكروم ثلاثي التكافؤ Cr (III) من مياه الصرف التركيبية. كان استخدام كل من الوصل الفردي و المزدوج لعملية التخثير الكهربائي من أجل إزالة الكروم الثلاثي عمليةً ملائمةً. جرت دراسة تأثير كل من كثافة التيار الكهربائي (ضمن المجال من 2 و حتى 25 ميلي أمبير/سم2) و تركيز الكروم الابتدائي (ضمن المجال من 100 و حتى 250 مغ/ل) على كفاءة إزالة الكروم في خلية دفقية مضطربة من أجل كل من الوصلين الفردي و المزدوج. لوحظت إزالة شبه كاملة للكروم الثلاثي % 99.88 من مياه الصرف الحاوية على تركيز أولي للمعدن قدره 250 مغ/ل بعد 20 دقيقة من عمل المخثر الكهربائي في حالة الوصل المزدوج لدى استخدام كثافة تيار كهربائي قدرها 25 ميلي أمبير/ سم2 عند إضافة 4.5 ميلي مول /ل من داعم الالكتروليت مقابل إزالة قدرها % 89.58 لدى استخدام الوصل المفرد. و كان مصروف الطاقة خلال هذه العملية لنفس الشروط السابقة حوالي 47 كيلو واط ساعي/م3 للوصل المزدوج و حوالي 15.3 كيلو واط ساعي/م3 للوصل المفرد من أجل الحصول على نفس الفعالية السابقة.
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 influences 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.
References used
Mohan D., Pittman C., Activated carbons and low cost adsorbents for remediation of tri-and hexavalent chromium from water, J. Hazard. Mater. B137, 2006, 762–811
Sarin V., Sarvinder Singh T., Pant K.K., Thermodynamic and breakthrough column studies for the selective sorption of chromium from industrial effluent on activated eucalyptus bark, Bioresour. Techonol. 97, 2006, 1986–1993
Gode F., Pehlivan E., 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
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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 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 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).
The study was carried out on the sorption of heavy metals (Pb+2, Zn+2) under static
conditions from single- and multicomponent aqueous solutions by Syrian Zeolite mineral
extracted from south Syria. The removal has an ion-exchange nature and consis
ts of three
stages: the adsorption on the surface of microcrystals, the inversion stage, and the
moderate adsorption in the interior of the microcrystal, The study showed that equilibrium
time is 6 hours, and The slight difference between adsorption capacity of the Zeolite
toward lead, zinc from single- and multicomponent solutions may testify to individual
sorption centers of the zeolite for each metal. The maximum sorption capacity toward pb2+
is determined as 33.89 mg/g at an equilibrium concentration of 261.07 mg/L and toward
Zn+2 as 29.18 mg/g at 309.818 mg/L. Langmuir and Freundlich Adsorption Isotherms
were used to evaluate natural zeolite adsorption performance for Lead, Zinc. These
Isotherms were able to provide suitable fit with experimental data, the factor R2 ranged
between 0.95 – 0.99, with better fit to Langmuir Isotherm.
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