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Studies on the Craft of Nitrogen-removal and the Process Control with Biological Aerated Filter (BAF)

Author: LiuJian
Tutor: DaiYouZhi
School: Xiangtan University
Course: Environmental Engineering
Keywords: BAF Biological Nitrogen Simultaneous nitrification and denitrification Biofilm characteristics Biota Kinetics
CLC: X703
Type: Master's thesis
Year: 2005
Downloads: 1124
Quote: 8
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Abstract


This paper studies the BAF denitrification process and process controls related content to study the reactor startup and influencing factors, spatial characteristics of the reactor , backwashing characteristics and biofilm reactor and biological phase change. The results show that : 1. BAF using the new modular hanging membrane in a relatively short period of time ( about ten days ) biofilm success ; experimental operation optimization parameters : hydraulic loading is 0.4 m 3 / (m 2 · h) to 0.9 m 3 / (m 2 · h), air-water ratio 5: 1, pH value of 7.5 to 8.2 , ammonia nitrogen load is less than 1.16 kg NH 4 -N / m 3 · d, organic volumetric loading of less than 2.6 kgCOD / m 3 · d. 2 BAF removal of organic matter and ammonia have different optimal bed height , along the flow direction ( from top to bottom of filler layer ) lags CODcr removal of ammonia removal . Indicates that BAF upper aerobic heterotrophic bacteria carbide active layer , the lower layer is active nitrifying bacteria . 3 Best BAF backwash time 7min, backwash cycle should not exceed 5 days. After backwash COD cr removal of ammonia returned to normal faster than that BAF backwash effect on nitrifying bacteria than on the impact of heterotrophic bacteria carbonation . 4 BAF during the run the reactor has rich biota , along the flow direction of the advantages of the biofilm were flagellated protozoan class , swim class type cilia , sessile ciliated class , show a clear plug flow characteristics , after backwashing phase gradually enriched biological changes periodically . 5 BAF and other biofilm difference is that both biological floc retention , adsorption of suspended solids and the role of oxidative degradation of the substrate . The major route denitrification reactor for simultaneous nitrification and denitrification and anaerobic stage in addition to the normal denitrification pathway outside there is a certain anaerobic ammonium oxidation. 6 BAF NH 4 -N removal rate equation for the kinetic experience : C NH 3 -N = C NH 3 -N, 0 e -kh , where k is 0.6186 .

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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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