Cyanide Removal and Recovery by Electrochemical Crystallization Process
| العنوان: | Cyanide Removal and Recovery by Electrochemical Crystallization Process |
|---|---|
| المؤلفون: | Chi-Wang Li, Vinh Ya, Natacha Martin, Kwang-Ho Choo, Vincenzo Naddeo |
| المصدر: | Water, Vol 13, Iss 2704, p 2704 (2021) Water Volume 13 Issue 19 |
| بيانات النشر: | MDPI AG, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | crystallization, Cyanide, Geography, Planning and Development, Aquatic Science, Electrochemistry, Biochemistry, law.invention, chemistry.chemical_compound, law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Vaporization, cyanide removal, Crystallization, TD201-500, Water Science and Technology, Prussian blue, prussian blue, Water supply for domestic and industrial purposes, Precipitation (chemistry), Chemistry, iron hexacyanoferrate, Hydraulic engineering, Wastewater, Aeration, TC1-978, Nuclear chemistry |
| الوصف: | Alkaline chlorination, an efficient but high chemical cost process, is commonly employed for cyanide (CN−) removal from CN-rich wastewater streams. CN− removal and recovery through the precipitation of Prussian Blue (Fe4III[FeII(CN)6]3, PB) or Turnbull’s Blue (Fe3II[FeIII(CN)6]2, TB) were realized using iron salts, leading to a cost-effective and sustainable process producing a valuable recovery product. However, the precipitation of PB and TB is highly affected by pH and dissolved oxygen (DO). CN− removal and recovery from CN-containing water by crystallization of PB and/or TB were investigated using dissolved iron that was electrochemically generated from a sacrificial iron anode under various pH values, initial CN− levels (10 to100 mg/L) and DO levels (aeration, mechanical mixing, and N2 purging). It was shown that the complexation of CN− with Fe ions prevented the vaporization of HCN under acidic pH. At pH of 7 and initial CN− concentration of 10 mg/L, CN− removal efficiency increases linearly with increasing Fe:CN− molar ratios, reaching 80% at the Fe:CN− molar ratio of 5. A clear blue precipitate was observed between the pH range of 5–7. CN− removal increases with increasing initial CN− concentration, resulting in residual CN− concentrations of 8, 7.5 and 12 mg/L in the effluent with the Fe:CN− molar ratio of 0.8 for initial concentrations of 10, 50 and 100 mg CN−/L, respectively. A polishing treatment with H2O2 oxidation was employed to lower the residual CN− concentration to meet the discharge limit of < 1 mg CN−/L. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2073-4441 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3a34c3cfbe7f5e750c1e86580df3606 https://www.mdpi.com/2073-4441/13/19/2704 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....a3a34c3cfbe7f5e750c1e86580df3606 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20734441 |
|---|