Biofiltration control of pulping odors - hydrogen sulfide: performance, macrokinetics and coexistence effects of organo-sulfur species

Abstract

: The work reported here describes the aerobic biodegradation of reduced sulfur compound mixtures in air streams by bioülters. Rates of removal of hydrogen sulüde as a sole substrate and in the presence of organo-sulfur compounds were determined to see if there were any inhibitory eþ ects of the organo-sulfur compounds on the rate of hydrogen sulüde removal. Experiments were conducted in three bench-scale bioülters packed with the mixtures of compost/perlite (4 : 1), hog fuel/ perlite (4 : 1), and compost/hog fuel/perlite (2 : 2 : 1), respectively. Hydrogen sulüde, the predominant odorous gas produced from kraft pulping processes, was used as the main pollutant (substrate). Other organo-sulfur species (dimethyl sulüde and dimethyl disulüde), also emitted from kraft pulp mills, were used as competing (secondary) substrates in the waste gas stream. To describe rates of removal a Michaelis-Menten type kinetic equation was modiüed to incorporate the plug ýow behavior of bioülters, and used in evaluating the pseudo-kinetic parameters, (the maximum removal rate) and V max (the half saturation concentration), for hydrogen sulüde biodegradation, and the type of macro-K m kinetic competition between hydrogen sulüde and the organo-sulfur compounds. No signiücant diþ erences in for the three bioülters were observed. The ranged between 136 and 147 g m-3 h-1, V max V max while the varied from 44 to 59 ppmv for the three bioülters. Hydrogen sulüde elimination capacity K m was not aþ ected by the presence of any of the organo-sulfur species in all of the three bioülters, conürming earlier results that hydrogen sulüde removal in bioülters is independent of the presence of organo-sulfur compounds mainly because of its easy biodegradability.

Biofiltration of reduced sulphur compounds and community analysis of sulphur-oxidizing bacteria

“…Therefore, the presence of H 2 S inhibited the capacity of T. thioparus to degrade MM, DMS and DMDS. Wani et al (1999) studied the elimination of H 2 S in the presence of DMDS and DMS. They did not find any significant changes in the maximum removal rate of H 2 S for three different biofilters packed with mixtures of compost/perlite (4:1), hog fuel/perlite (4:1) and compost/hog fuel/perlite (2:2:1), respectively.…”

“…The main advantage of these technologies is that different microorganisms, carriers and operational conditions can be used in each stage. The two-stage biofiltration has been investigated for the removal of H 2 S in the presence of DMS (Sercu et al, 2005), MM (Pinjing et al, 2001), DMS/MM (Ruokojärvi et al, 2001) and DMS/DMDS (Wani et al, 1999), but little is known about the simultaneous removal of MM/DMS/DMDS in the presence of H 2 S in two-stage biotrickling filters.…”

Co-treatment of single, binary and ternary mixture gas of ethanethiol, dimethyl disulfide and thioanisole in a biotrickling filter seeded with Lysinibacillus sphaericus RG-1

“…Macrokinetics of a biotrickling filter can be expressed by a Michaelis-Menten type relationship by assuming that oxygen limitation is not present in the system since the system is aerobic [5]. At steady state, the growth rate of microorganisms was balanced by their own decay rate, resulting in the biological equilibrium of the system.…”

“…They can enter the atmosphere as contaminants during their manufacture, use, and disposal of the organic or inorganic matters from agriculture and food industry [4], paper making industry [5], and waste and sewage treatment process [6,7]. It is worth noting that some of the VOSCs, such as ethanethiol, dimethyl disulfide (DMDS) and thioanisole, usually can be found in these processes.…”

Livestock Air Treatment Using PVA-Coated Powdered Activated Carbon Biofilter

“…2004; Classen et al, 2000;Elmrini et all., 2004;Green et al, 2005;Janni and Nicolai, 2000;Morgan-Sagastume and Noyola, 2006;Nicolai and Janni, 1999;Nicolai et al, 2002;Sheridan et al, 2002;Sun et al, 2000;Wani et al, 1999). Although their costs are low, the natural filter media will decompose, settle, and compact with time (Sun et al, 2000).…”