Use of mature compost as filter media and the effect of packing depth on hydrogen sulfide removal from composting exhaust gases by biofiltration

Removal of hydrogen sulfide from biogas using activated carbon synthesized from different locally available biomass wastes - a case study from Palestine

“…At concentrations of 100 to 200 ppm, H 2 S may cause a blurred vision and death following exposure for 1–8 h [ 7 ]. Moreover, dissolved H 2 S with concentration up to 50 ppm causes fermentation inhibition since it is toxic to the bacteria in the slurry of bioreactors [ 8 ]. Technically, H 2 S is corrosive and can significantly damage the metallic parts of the biogas facilities and electrical generator [ 9 ].…”

“…In the literatures, various biological, chemical and physical techniques have been successfully applied for the purification of biogas from H 2 S such as biological desulfurization, chemical absorption, water scrubbing, membranes and adsorption [8][9][10][11][12][13][14]. Adsorption is one of the most effective technologies applied in removing H 2 S from biogas streams.…”

“…During the adsorption process, the biogas is contacted with an adsorbent in which the H 2 S is collected on the surface and interior microstructure of the adsorbent. Several types of adsorbents have been proposed in the literature, including metal oxides, silica gel, zeolites, synthetic resins, and activated carbon [8,[15][16][17][18][19][20][21]. Activated carbon has been widely used for the treatment of wastewater and waste gases.…”

Simultaneous hydrogen sulfide removal and wastewater purification in a novel alum sludge-based odor-gas aerated biofilter

“…In fact, biofilm is a mixture of bacteria, fungi, yeasts, ciliated protozoa, amoebae, nematodes, algae and water [25]. In the present study, various bacteria have been contributed in bioprocesses to decompose H 2 S to elemental sulfur based on their functions as biocatalysts, such as phototrophic bacteria (also known as green sulfur bacteria), chemotrophs and Xanthomonas [37]. In the literature [31,38], bioconversion of H 2 S in presence of oxygen as a main electron acceptor can be described by Eqs.…”

“…Previous studies have shown that acclimatization could shorten or even eliminate the biofilter start-up phase [37]. Thus, before the H 2 S was introduced to column 1 (Al-OAF), air was supplied at a flow rate of 20 L/h and 4 h per day for two weeks to acclimatize and develop the biofilm (The same manner was applied for column 2).…”