Under normal temperature, UASB is adopted to treat yeast sewage according to yeast solution, specielty T=26.8-28℃, COD=7129-9823mg·l-1, removal rate of COD=66.0-71.0% , recycled marsh gas rate is 2.4-3.0 L·l-1·d-1, the loading of CHi in the marsh gas = 61.5-69.1 % .
Thereafter, under the condition of pH 5.8~6.0, influent COD3000mg/L and loading rate 5.2kg COD/(m3d), the reactor operated stably for 29 days with the average COD removal rateof 89.2%, effluent total alkalinity of 264.4mg CaCO3/L and the methane content of about 56.9% in biogas.
The results showed that the factors of discharge voltage, discharge area, ratio of O_2/CH_4 and total gas flux have a remarkable influence upon the methane conversion, C_2 hydrocarbons yield and selectivity. Then the better conditions of methane conversion have been obtained: 1150V of discharge voltage, 7.065cm2 of discharge area, 0.17 ratio of O_2/CH_4, 220ml/min of total gas flux.
It is found that the catalytic activity of 8.2 % Ni content was the best for partial oxidation of methane under the conditions of 800~900 ℃ reaction temperature and the methane conversion and the selectivity of CO and H2 were increased with the increase of temperature and decreased with the increase of pressure(0.1~1.0 MPa) under high space velocity .
Effects of MgO promoter on properties of Ni/Al2O3 catalysts for partial oxidation of methane to syngas
The effects of MgO promoter on the physicochemical properties and catalytic performance of Ni/Al2O3 catalysts for the partial oxidation of methane to syngas were studied by means of BET, XRD, H2-TPR, TEM and performance evaluation.
Moreover, for the catalysts with a proper amount of MgO promoter, the nickel dispersiveness was enhanced, therefore making their catalytic performance in methane partial oxidation improved.
The plasma catalyst treatment could totally change the distribution of aromatic products with higher methane conversion compared to the untreated catalyst.
Besides precursors, methane as the carbon source and hydrogen as the ablation, oxygen or H2O was alternatively inlet into the reactive chamber at the pressure of 0.05 MPa.
Results from scanning electron microscope (SEM) and transmission electron microscope (TEM) showed that CNTs grown in CH4/H2 (38.6%/61.4%, volume) mixture have many defects and contained disordered graphitic materials.
In this paper, the premixed combustion of CH4/air mixture in a porous medium is numerically simulated with a laminar combustion model.
The experimental results show that H2, CO2 and CH4 are the main gas products, and the molar fraction of hydrogen reaches in excess of 60%.
The results of calculating the thermal conductivities of nine low-density molecular gases N2, O2, NO, CO, CO2, N2O, CH4, CF4, and SF6 obtained using the modified Eucken correction are compared with the standard results.
The reactions of molecular elimination of CH4, C2H4, and C3H6do not play a substantial part in the mechanism of chemical transformations of TES.
An occurrence of marsh gas in deccan traps (Basalt) in central India
During the course of groundwater exploration in the upper catchment of Betwa River basin in Madhya Pradesh, Central India, marsh gas at a depth of 171.33 m below ground level (bgl) has been observed bubbling out of the flowing water.
It is believed that an occurrence of marsh gas in Deccan Traps has not been reported earlier.
Marsh gas bubbling up in swampy areas is easily observed, and is a natural feature of this environment.
One of the demonstrations involved the decomposition of marsh gas.
The methane reservoirs in this basin are the Carboniferous and Permian coals.
C1, the methane-utilizing yeast Candida boidinii, and plants Arabidopsis thaliana and Glycine max (soybean) was performed.
The results of measuring the adsorption deformation of an ACC microporous carbonic adsorbent during the methane adsorption in 177.65-to 393.00-K temperature and 0-to 6-MPa pressure ranges are given.
There is a close correlation between the activity of benzene formation in the methane aromatization and the Br?nsted acidity of HZSM-5 due to the bifunctional catalysis.
A decrease in the reaction temperature and in the methane conversion is accompanied by coking of the catalysts and, in the case of Fe/HZSM-5, by the appearance of trace amounts of methanol and formic acid in the gas phase.