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Nitrogen removal study of scrap iron in permeable reactive barriers |
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Abstract This paper discussed effects of various factors on the reduction of total nitrogen and nitrate with scrap iron(materials of PRB)respectively through single-factor experiment. These factors include pH, nitrate concentration of influent, reaction time and addition of bamboo charcoals, or manganese dioxide. Results indicated that reduction of nitrate and total nitrogen remain similar with change of pH, nitrate concentration of influent, reaction time or addition of bamboo charcoals. Interestingly, the nitrate and total nitrogen reduction by per g scrap iron improved dramatically with the addition of manganese dioxide. When adding manganese dioxide to the reaction, total nitrogen reduction by scrap iron increases 3 fold from 0.05mg/g to 0.17mg/g and the production of ammonia decreases simultaneously.
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Received: 30 June 2013
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