Penicillin production by free and agar immobilized Penicillium chrysogenum cells was investigated in a stirred tank reactor. increased two times with cells. In order to verify the oxygen transfer efficiency STR, mass coefficient determined using dynamic gassing out method at end of steady state operation reactor after achieving penicillin production. The (KLa) obtained STR 20% (V/V) beads, 1 VV...

Bank filtration (BF) and soil aquifer treatment (SAT) are efficient natural technologies in potable water reuse systems. The removal of many organic micro-pollutants (OMPs) depends on redox-conditions in the subsoil, especially on the availability of molecular oxygen. Due to microbial transformation of particulate and dissolved organic constituents, oxygen can be consumed within short flow dist...

[1] Systematic variations in pore water chemical and thermal profiles from sediment gravity cores indicate the presence of a ‘‘cool’’ (10–20 C) ridge-flank hydrothermal system within basement surrounding Dorado outcrop, a small basaltic edifice on 23 Ma seafloor of the Cocos Plate. Dorado outcrop is located within a 14,500-km region of cool seafloor, where 60–90% of the lithospheric heat is rem...

The Southern timber market is the major source of both softwood and hardwood pulpwood in the US. In 1997, three-fourths of total US pulpwood production was produced in the region. The locations of pulpmills and fiber sources determine the patterns of pulpwood trade between the states. Prediction of trade is important for understanding subregional pulpwood markets in the US South and for timber ...

Biological nitrogen and phosphorus removal was investigated in an intermittently aerated sequencing batch reactor (IASBR) and a sequencing batch reactor (SBR). The removal efficiencies of ammonium-nitrogen (NH4(+)-N) were 100% in both reactors in steady operation state. The total nitrogen (TN) removal efficiencies were 90.4% in the IASBR and 79.3% in the SBR, while the total phosphorus (TP) rem...

introduction: for a velocity profile in turbulent flows, the flow conditions in the vicinity of the wall are described by logarithmic law of the wall. however, it has been extensively verified that the log-law does not apply in the outer region of the boundary layer. for example, in free surface flows, the law of the wall holds only for 20 percent of the flow depth from the wall. coles (1956) c...

Rock filters are an established technology for polishing waste stabilization pond effluents. However, they rapidly become anoxic and consequently do not remove ammonium-nitrogen. Horizontal-flow aerated rock filters (HFARF), developed to permit nitrification and hence ammonium-N removal, were compared with a novel vertical-flow aerated rock filter (VFARF). There were no differences in the remov...

Abstract This paper evaluates the performance of a subsurface flow constructed wetland at Worms Germany used for treatment black and grey water from non-residential facility. Snap samples four wells made up clarifying unit, an activated carbon unit aeration were analysed insitu using HACH HQ40d multimeter exsitu Sensafe metals check strips preliminary metal detection onsite. bar code reagents, ...