Removal of ammonia nitrogen from cultured seawater by intermittent electrochemical oxidation with modified carbon materials
Ammonia nitrogen is a major pollutant in aquaculture seawater,and electrochemical oxidation shows promise for its removal.A hydrothermal method was employed to load a nickel-copper hydroxide catalyst onto a carbon rod and optimize its composition ratio.The effects of various factors on the removal rate of ammonia nitrogen and the changes in intermediate products during electrochemical oxidation of simulated cultured seawater were investigated.The results indicated that:(1)the optimal catalyst was prepared with a total ion molar concentration of 1.0 mmol/L and a Ni2+∶Cu2+molar ratio of 8∶2.(2)The optimal experimental conditions included a plate spacing of 1.0 cm,electrode length of 2.0 cm,voltage of 1.7 V,and temperature of 40℃,resulting in a removal rate of ammonia nitrogen of 99.9％.(3)The simulated cultured seawater,with an ammonia nitrogen concentration of 12 mg/L,was treated using intermittent electrification.During the electrification and de-electrification stages,the removal amounts of ammonia nitrogen were 3.97 and 0.44 mg/(cm2·h)respectively.During de-electrification stage,monochloramine dominated the removal of ammonia nitrogen.
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万方数据
维普
