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Experimental Study on Municipal Wastewater Treatment by Two-stage BAF

Author: PeiYuJiao
Tutor: ZhuLei
School: Wuhan University of Science and Technology
Course: Municipal Engineering
Keywords: pre-denitrification Two-Stage bamboo charcoal media BAF process optimum operating conditions sewage treatment
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 0
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Abstract


The development of advaneed stewatertreatment Proeesses with high effeetive,low consumption and investment saving will have the vital Practieal significance to the districts of sewage disposal. Biological Aerated Filter（BAF）is a newly developed process which is used for the wastewater treatment in recent years, and it integrated solids separation as well as secondary or tertiary biological treatment in one unit .BAF has advantages of less land occupied,high treatment efficiency,on requirement for secondary settling tanks highter capacity for absorbing shockload and cost savings.In order to study its performance and handling characteristics of urban sewage,Two-Stage bamboo charcoal media biological aerated filter is used in the treatment of domestic wastewater in this experiment. The main contect of the study is: to determine the time of membrane forming;discussion the removal rules of BOD5、COD、SS、NH4+-N、TN and TP,the influence of loading rate,temperature ,pH value on removal efficiency,optimizing the running parameters, determine the ultrafiltration membrane;then studied the performance and characteristics of the pre-denitrification Two-Stage bamboo charcoal media BAF process by orthogonal experiment,and optimizing the running parameters.The results show as folloow:（1）Bamboo charcoal could be used as alternative materials.The treatment efficiency of Two-Stage bamboo charcoal media BAF process and the pre-denitrification-Two-Stage bamboo charcoal media BAF process is high.But the latter is more better on the treatment efficiency of TN.（2）The optimum operating conditions of Two-Stage bamboo charcoal media BAF process is:the first stage air /water ratio is 4:1,the second stage air /water ratio is 1:1,the hydraulicloading is 0.5m3/（m2·h）（3）The optimum operating conditions of pre-denitrification-Two-Stage bamboo charcoal media BAF process is: the first stage air /water ratio is 4:1,the second stage air /water ratio is 2:1,the hydraulicloading is 0.5m3/（m2·h）, the hight of anaerobic zone is 0.5m, the reflux ratio is 1.5:1.

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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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