Abstract In order to effectively reduce the concentration of NO3--N in the effluent of the municipal wastewater treatment plant, the basic experiments and proving tests were conducted in order. The KNO3 solution prepared was sampled for evaluating NO3-- N removal efficiency by adding H+、Fe2+、Cu2+ and Pd/Al2O3, respectively. Results showed that certain removal performances could get (92%、41%、61%), when the pH was 2.1, or with the dosage of 1000mg/L for Fe2+ and Cu2+, respectively; one thing we could not neglect was that NH4+-N dominated in the products. However, 48% removal efficiency could be reached and N2was predominant in the products with dosage of 10g/L of the catalysts (Pd/Al2O3) and pH of 3.02. The effluent of the wastewater treatment plant was used for the proving tests. It can be concluded that under certain condition, ideal efficiency could be obtained through the above mentioned ways. Taking nitrate removal efficiency, byproducts, water properties into consideration, the chemical catalytic reduction of nitrate in wastewater could be more practicable.
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Received: 10 April 2015
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