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Treatment of Urban Wastewater with Biofilm Hydrolyric-acidification Process

Author: ChengLeiLuo
Tutor: JiMin
School: Tianjin University
Course: Environmental Engineering
Keywords: Urban sewage Biofilm Hydrolysis acidification Filler
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 2
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Abstract


A high proportion of Tianjin the North Wharf sewage treatment plant influent industrial wastewater , poor biodegradability . The plant used in the design of technology upgrading the hydrolysis acidification biofilm technology as a pretreatment process to improve wastewater biodegradability . In order to verify whether the the hydrolysis acidification biofilm technology better sewage treatment plant , we use small-scale test device , two fillers ( combination of filler and foam sponge filler ) biofilm hydrolysis acidification actual sewage wastewater treatment plant Beicang . Analysis and comparison of the two filler hydrolysis acidification reactor wastewater biodegradability improved performance , operating conditions and impact factors . Test fast mud hanging membrane combination of fillers and foam sponge fillers are basically complete the hanging film in 2 weeks . The mature hanging film , the combination of filler biofilm reached 3420mg / L, the foam packing up to 2400 mg / L . Treatment of raw sewage through a combination of filler and foam sponge filler biofilm hydrolysis acidification reactor effluent biodegradability have greatly improved . When the hydraulic retention time of 10h and water BOD5/COD ratio is 0.38 , a combination of fillers reactor and foam sponge reactor , the effluent the BOD5/COD respectively 0.54 and 0.50 , the ratio of BOD5/COD improve the ratio reached 34% and 22% . After the two fillers biofilm hydrolysis acidification reactor , the water solubility of COD, the proportion of biodegradable COD has improved . Two packed reactor in the HRT for 10h under water acidification rate (biodegradable COD in VFA conversion rate ) Max , respectively 21% , 15%, preferably acidification rate . The hydrolysis rate constant of the reactor of the two fillers Kh (h-1) were 0.20 and 0.16 , respectively . Analysis of the impact of factors, including the impact of volume load , HRT, pH and temperature of the hydrolysis acidification reactor . Best two filler reactor hydraulic residence time of 10h, lengthening and shortening HRT have a certain impact on the hydrolysis acidification effects , impact on the the hydrolysis acidification of the effect of volume load performance under low load conditions , two reactor with the increased volume load , the effect of hydrolysis acidification stable . (2.0 kgCOD/m3.d ) running under high load conditions , the hydrolysis acidification effect is reduced as the load increases .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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