Simultaneous removal of ammonia and hydrogen sulfide gases using biofilter media from the biodehydration stage and curing stage of composting

Abstract

Biofiltration of NH and HS with different packing media, biodehydration stage compost (BSC), and curing stage compost (CSC) was studied. Meanwhile, fluorescence excitation-emission matrix (EEM) spectroscopy was used to characterize the conversion mechanisms of organic matter during these biofiltration processes. Both biofilters were effective for the simultaneous removal of NH and HS when inlet concentrations of NH and HS were 0-50 and 50-250 mg/m, respectively. An abrupt increase in the inlet gas concentrations of NH and HS to 100-150 and 200-250 mg/m, respectively, caused the decrease in the removal efficiencies (REs) of NH and HS in the BSC biofilter, followed by a slow upturn. By contrast, relatively steady REs of both NH and HS were observed in the CSC biofilter. After 60 days of operation, the average REs of NH and HS were more than 95 % in the CSC biofilter. During the operation of CSC, nitrate and nitrite peaked around the 30th day, whereas sulfate showed a steady increase. The excitation-emission matrix fluorescence and parallel factor analysis (EEM-PARAFAC) indicated that the simultaneous inlet of NH and HS facilitated the degradation of protein-like substances, whereas humic-like substances played an important role in the packing filters for the treatment of the two odorous pollutants.

Effect of Different Proportions of Three Microbial Agents on Ammonia Mitigation during the Composting of Layer Manure

“…The release of ammonia is greatly affected by temperature and pH [29]. At 25 °C and under standard atmospheric pressure, ammonia is dissolved in water at a ratio of 700:1, but as the temperature increases, the solubility of ammonia decreases rapidly and it is released as a gas [30]. Both lactic acid bacteria and B. stearothermophilus produce acid during composting, thereby reducing the pH of the heap.…”

Variations in microbial community structure and functional gene expression in bio-treatment processes with odorous pollutants

“…NH 3 and H 2 S are two important indicators for the removal of odorous gases 41,42 . In the past decade, biofilters with different packing media have been widely used to simultaneously remove NH 3 and H 2 S gases 43 . In our study, most of the genes involved in ammonia and sulfite metabolism were identified in the BT group, and not the AT group.…”

Ionic liquids and deep eutectic solvents for NH3 absorption and separation: a review

“…In addition, the biodegradation method is an excellent NH 3 removal method since it is a clean and pollution-free operating procedure due to the metabolic activity of bacteria and other microorganisms to decompose NH 3 . At present, bio-trickling filter, 32,33 bio-scrubbing, and bio-filtration 34–36 are the most frequently investigated and mature microbial degradation procedures. The biodegradation methods have the advantages of high treatment efficiency, strong selectivity, low operating cost, and negligible secondary pollution.…”