Abiotic and Biological Mechanisms of Nitric Oxide Removal from Waste Air in Biotrickling Filters

Abstract

Nitric oxide (NO) may participate in the ozone layer depletion and forming of nitric acid. Abiotic and biological mechanisms of NO removal from waste gases were studied in a biotrickling filter. The abiotic NO removal rate in the biotrickling filter was estimated by a review of the literature. The abiotic and biological removals were also verified in the biotrickling filter. The result has shown that chemical oxidation and bionitrification were both involved in the NO removal. It was found that the NO removal in high concentration (ϳ1000 ppm or higher) was in large measure the result of abiotic removal in both gas-phase and liquid-phase reactions. When NO concentration is low (less than ϳ100 ppm), bionitrification was the main process in the NO removal process in the biotrickling filter.

NOxRemoval from Simulated Flue Gas by Chemical Absorption−Biological Reduction Integrated Approach in a Biofilter

“…The chemical absorption of NO and biological regeneration of Fe(II)EDTA taking place in the same reactor may have the advantages of easy operation and economical cost. Thus, a biofilter was chosen for NO removal in this study due to high porosity, high nutrient availability, high moisture retention capacity, and high buffering capacity to sustain microbial growth on a suitable support matrix − .…”

Removal of nitric oxide in a biotrickling filter under thermophilic condition using Chelatococcus daeguensis

“…The abiotic and biological removals were also verified in the BTF and it was found that chemical oxidation and bionitrification were both involved in the NO removal (Chen and Ma, 2006;Chou and Lin, 2000). In the case of the flue gas containing NO, O 2 concentration was often around 3-8%, thus only chemical and biological reactions under 8% were conducted and compared at different temperature (25 and 50 C).…”

“…BTFs contain inert packing materials (such as ceramics, compost) that provide sufficient surface area for gas/liquid mass transfer and biofilm growth. Several studies have proven the possibility of NO x removal in biofilters and BTFs at mesophilic temperatures (Chen and Ma, 2006;Jiang et al, 2009;Jun et al, 2008;Yang et al, 2007). However, in coal-fired power plants, influent flue gas stream for a NO x removal reactor is the emissions from a sulfur dioxide scrubber, which employs water/limestone slurry to absorb sulfur dioxide.…”

“…The biotrickling filter (BTF) is an emerging postcombustion control technology that can be used for biological NO x treatment (Chen and Ma, 2006;Jiang et al, 2009). BTFs contain inert packing materials (such as ceramics, compost) that provide sufficient surface area for gas/liquid mass transfer and biofilm growth.…”

Enhanced Reduction of Fe(II)EDTA-NO/Fe(III)EDTA in NOx Scrubber Solution Using a Three-Dimensional Biofilm-Electrode Reactor

“…Researchers have demonstrated that bioreactors can be successfully employed for the removal of NO x from combustion gases in a laboratory, but the high Henry’s constant of NO restricts a higher efficiency of NO removal . It was confirmed through abiotic and biological removals in the biotrickling filter that NO removals in high concentration (1000 ppm or higher) were in large measure the result of abiotic removal in both gas-phase and liquid-phase reactions while bionitrification was the main process of NO removal in low concentration (less than 100 ppm) . Hence a promising technique called chemical absorption-biological reduction (CABR) integrated approach has been developed recently for the NO x removal from flue gases. − In this approach, Fe(II)EDTA is used to overcome the limitation of biological treatment processes by promoting the NO absorption into scrubber liquor.…”