Abstract
Industrial organic sludge is the concern of society and government levels since this kind of sludge will lead to the pollution of groundwater, surface water, air and the invasion of the food chain, increasing the disease and causing the bad effects on health without collecting and treating thoroughly. For high organic pollutants in sludge, appropriate treatment technology to recover biogas, supply energy for demand of production and living, is one of the current and priority solutions. Research contents in this study were application of pretreatment by hydrolysis process and anaerobic sequencing batch reactor (ASBR) to enhance biogas recovery. The obtained experimental results by hydrolysis through the alkalization process demonstrated that COD removal efficiency reached 62%, collected methane gas increased 4.9 times (360ml/L) compared to confronting sample (directly digestion, without hydrolyzed phase), at pH of 12, for 12 hours of hydrolysis time and after 20 digestion days at room temperature (30 -350C). Research results on anaerobic digestion reactor at organic loading rate of 1,6 kg VS/m3.day showed that COD and VS removal effiencies can reach 61.59 – 62.24, 52.33 – 54.26%, respectively for 20 days. The methane yield obtained 0.343 – 0.402 m3CH4/kgVS (corresponding to 0.523 – 0.628 m3CH4/kg sludge).
Highlights
The sludge is one of the waste sources may cause environmental pollution and getting increasingly
The research result determined thermochemical hydrolysis was better than biological hydrolysis in a bench-scale operation with the COD removal efficiency, volatile solid (VS) removal efficiency, methane yield and methane biogas content were 88.9%, 77.5%, 0.52m3/kg VS and 79.5%, respectively
Research results showed that COD and VS removal efficiencies at loading of 1.6 kgVS/m3/day were the highest values, indicating long sludge retention time had the effect of increasing treatment efficiency
Summary
The sludge is one of the waste sources may cause environmental pollution and getting increasingly. In order to increase the efficiency of anaerobic digestion of industrial sludge and enhance the biogas production, it is necessary to carry out more researches to select appropriate conditions for industrial sludge treatment. Optimal condition for sludge digestion process was pH of 12, sCOD of 3600 mg/L after 12 hour operation at room temperature.
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