Abstract
Domestic sewage is treated by grapheme-based electrocatalytic oxidation process when adding salt or not. The results show that the removal rate of ammonia nitrogen and COD are 97.86% and 64.29% separately under the conditions of 1g/L salt, 4min residence time and 500A/m2 current density. The COD and ammonia nitrogen of produced water are 72.5mg/L and 1.35mg/L respectively which meet the comprehensive wastewater discharge standard of GB8978–1996, while the removal rate of ammonia nitrogen and COD are 97.22% and 74.55% separately under the conditions of 20 min residence time and 190A/m2 highest current density without adding any salt. The COD and ammonia nitrogen of production water are 57mg/L and 1.7mg/L respectively which meet the comprehensive wastewater discharge standard of GB8978–1996 too. In the experiment, about 95.11 % ~ 97.27 % of ammonia nitrogen is converted into nitrogen. The cleaning effects of the deposition by using hydrochloric acid and citric acid are investigated. The results show that the deposition can be cleaned by both of the 2% hydrochloric acid and 2% citric acid, but the immersion cleaning rate of citric acid which has residual left is slower than hydrochloric acid. The deposition can be thoroughly cleaned by cycle operation.
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