Removal of nitrate and sulphate from biologically treated municipal wastewater by electrocoagulation
2017
Kumar, Arun (Kumar Sharma) | Chopra, A. K.
The present investigation observed the effect of current density (j), electrocoagulation (EC) time, inter electrode distance, electrode area, initial pH and settling time on the removal of nitrate (NO₃ ⁻) and sulphate (SO₄ ²⁻) from biologically treated municipal wastewater (BTMW), and optimization of the operating conditions of the EC process. A glass chamber of two-liter volume was used for the experiments with DC power supply using two electrode plates of aluminum (Al–Al). The maximum removal of NO₃ ⁻ (63.21 %) and SO₄ ²⁻ (79.98 %) of BTMW was found with the optimum operating conditions: current density: 2.65 A/m², EC time: 40 min, inter electrode distance: 0.5 cm, electrode area: 160 cm², initial pH: 7.5 and settling time: 60 min. The EC brought down the concentration of NO₃ ⁻ within desirable limit of the Bureau of Indian Standard (BIS)/WHO for drinking water. Under optimal operating conditions, the operating cost was found to be 1.01$/m³ of water in terms of the electrode consumption (23.71 × 10⁻⁵ kg Al/m³) and energy consumption (101.76 kWh/m³).
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