A Critical Review of the Biological Processes in the Chemical Absorption- Biological Reduction Integrated System for NO Removal

Exploring low-cost, green, and safe technologies to provide an alternative to the conventionally selective catalytic reduction process is key to control the NOx emission from small-scale boilers and other industrial processes. For meeting this demand, the chemical absorption-biological reduction integrated system has been developed recently. This system applies Fe(II)EDTA for NO absorption and for the absorbent regeneration by iron-reducing and denitrifying bacteria . Many studies have focused on the enhancements of mass transfer and biological reaction, among which the biological processes were the rate-limiting steps. This review summarizes the current researches on the biological processes in the CABR system, which focuses on the mechanism and enhancement of biochemical reactions, and it also provides the possible directions for future research.