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Operating Characteristics Of UASB Reactor In Treating Starch Wastewater At Ambient Temperature

Posted on:2007-10-21Degree:MasterType:Thesis
Country:ChinaCandidate:R WangFull Text:PDF
GTID:2121360182491032Subject:Municipal engineering
Abstract/Summary:PDF Full Text Request
This paper described the mechanism of anaerobic microbe purifying wastewater, and at the same time, pilot plant research was made to investigate the operating characters of UASB (up-flow anaerobic sludge blanket) dealing with starch wastewater at ambient temperature. Result showed that the UASB reactor is in order when UASB start-up and steady running when the temperature is above 20℃.Set-up mode of UASB was bred sludge by self. The seed sludge was made up of digestion sludge from a municipal wastewater treatment plant and anaerobic sludge from the UASB reactor of brewhouse, and the proportion was 5:1. The seed sludge concentra- tion was 15kgVSS/m3. After seeding, the UASB reactor was operating. The sludge had spent 128 days from foremost relax flocculate to granular sludge. The diameters of granular sludge generally range from 1 to 2.5mm. Most of the granular sludge was sphericity. The wet specific gravity of the granular sludge was found to be 1.04g/cm3. The VSS/SS of granular sludge was above 0.7.The maximum specific methanogenic activity was 128 mL CH4/(gVSS· d). The granular sludge had high methanogenic activity and good settleability.After granulation, the effectiveness of UASB reactor had been improvement. The volumetric COD loading rate reached to 6.5kgCOD/m3d. COD removal efficiency was above 90%. In four day's impact load experiment, the volumetric COD loading rate had been increased from 6.5 kgCOD/ (m3·d) to 11.9 kgCOD/ (m3·d) with a lowering of COD removal efficiency to 82.3%. Under this condition the UASB reactor could still be normal operation.
Keywords/Search Tags:UASB reactor, granular sludge, anaerobic digestion
PDF Full Text Request
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