laboratory scale experiments were performed to evaluate the feasibility of biofilters for the removal of h2 s from wastewater treatment plant waste air. the effects of changes in air flow rate and contaminant concentration on biofilter performance treating h 2 s odours were also assessed. compost was used as media in biofilter. the study was carried out in six different phases, by increasing h2...

Background The aims of this study was to assess exposure to hydrogen sulphide (H2S) among waste water treatment workers (WWWs), and achieve a better measure of the risks of H2S exposure than only using the eight-hour average value and the ceiling value because the exposure pattern of H2S for WWWs is dominated by short-term peaks. Methods Ninety-three measurements of H2S from 56 WWWs in three ...

The main objective of the paper was the analysis of the properties of SnO2|WO3 heterocontact as well as the determination of its response to 50 ppm of hydrogen sulphide. It was noticed that the sensitivity of the sensor being tested to hydrogen sulphide depended significantly on the polarization direction. When its parameters were compared with those of sensors the gas-sensitive layer of which ...

In this work, a laboratory scale biofilter was design for removal of hydrogen sulphide packed with Thiobacillus thioparus immobilized in polyurethane foam particles (the initial immobilized biomass was 1.6×10 cel g of solid support). Three empty bed residence times (EBRT) were studied (100, 70 and 30 second) and the initial H2S concentration, ranging from 25 to 750 ppmv, in the inlet gas stream...

Septic tanks [1] are enclosed areas made for accumulation of decomposed domestic wastes, sewerage and its resultant gases. Sewer gases can be both toxic and non-toxic. Its major component is Methane [2], which can be extremely toxic in high concentrations. Sewer gas is a mixture of Hydrogen Sulphide, Ammonia, Carbon-dioxide, Nitrogen dioxide, Sulphur dioxide and sometimes, even carbon monoxide....

cysK mutants, deficient in O-acetylserine sulphydrylase A [O-acetyl-L-serine acetate-lyase (adding hydrogen-sulphide); EC 4.2.99.8], were isolated as strains resistant to selenite or giving a black colour reaction on bismuth citrate indicator medium. All were resistant to the inhibitor I,2,4-triazole. Four independent mutants were found which possessed lowered levels of O-acetylserine sulphydry...

Solec Spa is health resort in south-eastern Poland. Its unique balneorehabilitation significance worldwide is determined by chloride-iodine-sodium water with a high content of hydrogen sulphide. This water, classified as highly mineralized sodium-chloride (seltzer) sulphide, bromide, iodide, boron water, contains naturally approximately 0.9 g/l divalent sulphur compounds, which is the highest c...