A new process of NO removal from flue gas, using an integrated system of oxidation-absorption-biological reduction (OABR), is introduced. The experimental results show that increasing the NO oxidation ratio in flue gas can effectively improve the NO removal efficiency of the OABR system. The NO removal efficiency could reach 98.8% with 0.02 M NaHCO as the chemical absorbent and under the condition of the optimal NO oxidation ratio of 50%. During stable operation, the OABR system could maintain a high NO removal efficiency (above 94%) under the following conditions: 1-8 vol% (10-8 × 10 ppmv) O, 200-800 ppmv NO, 0.5-1.5 L/min gas flow rate and 100-800 ppmv SO. The nitrogen equilibrium results showed that about 59% of the nitrogen in the inlet NO were transformed to N through microbial denitrification, 37% of the nitrogen were converted to biological nitrogen for microbial growth, and only 1.1% of the nitrogen remained in the liquid phase. This new approach has an excellent NO removal performance and great potential for industrial application.
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