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- Title
Treatment potential of EC towards bio-digester effluent: effects of process parameters, aeration, and adsorbent.
- Authors
Sahu, Rahul Kumar; Shankar, Ravi; Mondal, Prasenjit; Chand, Shri
- Abstract
Present work deals with the decolorization and COD removal from the bio-digester effluent of a small-scale distillery unit through electrocoagulation (EC) in a batch reactor using aluminum (Al) as a sacrificial electrode. The effect of five independent factors namely, initial pH (pH0: 2–11), contact time (t: 30–180 min), current density (j: 22.73–172.73 A m−2), inter-electrode distance (d: 0.5–3 cm), and NaCl concentration (g: 0.5–3 g l−1) has been studied to assess their effect on decolorization and COD removal. Most suitable conditions for the decolorization and COD removal was found to be pH 3, after a run time of 120 min, current density 113.63 A m−2, inter-electrode distance 1 cm, and NaCl concentration 1.5 g l−1at the initial value of color and COD as 10,000 Hazen and 5 g l−1, respectively. Under optimum conditions, maximum decolorization and COD removal were 97.4 and 91.8%, respectively. It was found that application of aeration (air flow rate: 0.22 l min−1) and activated carbon powder as adsorbent (dose: 0.5 g at every 30 min) in EC reactor containing 1.52 l waste water can further enhance the removal efficiency.
- Subjects
SEWAGE purification; ELECTROCOAGULATION (Chemistry); ALUMINUM electrodes; CHEMICAL oxygen demand; DISTILLERIES
- Publication
Desalination & Water Treatment, 2015, Vol 54, Issue 7, p1912
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.895776