Volumetric loading rate was raised from 6. 0kgCOD/ (m￣3 ·d) to 10. 0kg COD/ (m￣3 ·d) , biogas production rate was raised from 1. 8Nm3/ (m3·d) to 3. 2Nm3/m3·d , the amount of alkali and dilution water for adjusting PH were also reduced.
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.
At pH 6.0, influent COD 4 000mg/L, COD OLR 7.5kg/(m3·d), the average COD removal efficiency was 90.9%, and the effluent alkalinity(CaCO 3) was 404.8mg/L, the biogas production per gram removal COD was 446.3mL with 55.9% methane content.
At pH 6.0, influent COD 3 000mg/L, COD OLR 5kg/(m3·d), the average COD removal efficiency of the EGSB reactor was 95.0%, while the effluent alkalinity (CaCO 3) was only 328.5mg/L, the biogas production per gram removal COD was 372.2mL with 57.6% methane content;
average volumetric COD loading rate and volumetric biogas production rate 4.67 kg/(m 3 d) and 0.99m 3/(m 3·d) respectively; methane content of biogas 72%.
The removal rates of COD, BOD5 and lignin were up to 95%~97%, 96%-99% and 75%~86% respectively. Especially, 0.349m3 of marsh gas will be generated by removing 1kg COD, and the treated wastewater could be reused to retting-flax,which will increase the production of flax with better economic and environmental benefit.
By this method,the marsh gas engineering adopted the technology of EGSB,which compared with UASB,the investment was saved by 50%,the processing expense was reduced by 50%,the level of COD was dropped by 33% in the exit.
It is showm that SW type desulfurizer is very effective,can decrease eontent of H_2S in marsh gas from 3000～5000 mg/m￣3 to below 20 mg/m￣2, national standard is achieved,thesaturated desulfurizer is used as raw material in producing of sulfuric acid.
For the system of industrial test for treatling 200m 3/d wastewater, the removal rate of COD reached to over 90%, and the H 2S in firedamp was finally recovered as the by-product of sulfur.
Methane production rates were 0.039, 0.047, 0.064, and 0.069 ml/g OM per 1 h, with the mean relative amounts of methane in the biogas being equal to 25, 41, 55, and 62%, respectively.
Results of theoretical and experimental studies are presented on liquid waste processing in a biogas unit by differentiated renewal of brewed mass in the reactor relative levels.
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.
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.
沼气
biogas
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