On-line batch production of ferrate with an chemical method and its potential application for greywater recycling with Al(III) salt
| Autor: | Yarui Song, Dongsheng Wang, Jianwei Ma, Bin Men |
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| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Iron 0208 environmental biotechnology Salt (chemistry) Portable water purification 02 engineering and technology 010501 environmental sciences Greywater 01 natural sciences Ferric Compounds Waste Disposal Fluid Water Purification Environmental Chemistry Recycling 0105 earth and related environmental sciences General Environmental Science chemistry.chemical_classification Total organic carbon Alternative methods Environmental engineering General Medicine 020801 environmental engineering Wastewater chemistry Sewage treatment Water treatment Salts Water Pollutants Chemical Nuclear chemistry Aluminum |
| Zdroj: | Journal of environmental sciences (China). 52 |
| ISSN: | 1001-0742 |
| Popis: | Ferrate(VI) salt is an oxidant and coagulant for water and wastewater treatment. It is considered as a possible alternative method in greywater treatment. However, challenges have existed in putting ferrate(VI) technology into full-scale practice in water and wastewater treatment due to the instability of ferrate solution and high production cost of solid ferrate products. This study demonstrated a new approach of greywater treatment with on-line batch production of Fe(VI) to which Fe(III) salt was oxidized at a weak acidity solution. A series of experiments were conducted to investigate the effect of Fe(VI) on light greywater (total organic carbon (TOC)=19.5mg/L) and dark greywater (TOC=55mg/L) treatment under different conditions with varying pH and Fe(VI) doses. In addition, the combination use of Fe(VI) and Al(III) salts was proved to be more efficient than using the Fe(VI) salts alone at greywater recycling. The optimum dosage of Fe(VI)/Al(III) salts was 25/25mg/L for light greywater, 90/60mg/L for dark greywater, respectively. The TOC values of both light greywater and dark greywater were reduced to less than 3mg/L with the dosages. The cost for treating greywater was 0.06-0.2$/ton at ferrate(VI) dosage of 25-90mg/L and 0.008-0.024$/ton at AlCl3 dosage of 25-60mg/L. The full operating cost needs further assessment before the Fe(VI)/Al(III) technology could be implemented in greywater treatment. |
| Databáze: | OpenAIRE |
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