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Nitrogen Removal by Multi-stage Biological Filter Process

Author: ZhangXianBing
Tutor: DongWenYi
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Multi-stage biological aerated filter In addition to carbon Efficient denitrification
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 44
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Abstract


For the realization of the urban sewage Biological Aerated Filter (Biological Aerated Filter BAF) efficient process in addition to carbon and nitrogen removal, the research group is based on the partition strengthen the different functions of microorganisms in the biological treatment process proposed upward flow ceramic filter level the BAF in addition to carbon nitrogen removal process. Through small, denitrification performance and operating parameters of the process in addition to carbon optimization, and were compared with the single-stage and two BAF process. First reference object as a single-stage BAF pilot study using actual sewage. By controlling the influent load of COD and NH 4 -N removal efficiency were examined. The results show that, when high influent load (≈ 2.81kgCOD / m 3 · d), the effluent COD reached an A standard, but NH to the 4 -N exceeded; When the the lower influent load (≈ 1.33kgCOD / m 3 · d), can achieve COD and NH 4 -N standards. The COD removal mainly occurred in the bottom of the filter column, while the NH 4 -N removal occurs mainly in the middle and upper parts. In a single-stage BAF filtration column, heterotrophic bacteria and nitrifying bacteria required environmental conditions are difficult to meet, and the backwash process both quite different, it is difficult to simultaneously achieve COD and NH 4 -N the efficient removal and effluent quality fluctuations. In order to achieve high efficiency in addition to carbon and the nitrification, using two BAF in the same conditions of total HRT and the total amount of aeration and a BAF, by controlling the influent load, the air-water ratio and the backwash mode, in the first and the two BAF respectively create environmental conditions suitable for heterotrophic bacteria and nitrifying bacteria, COD and NH 4 -N removal efficiency. The results show that, even with higher influent load (gt; 3kgCOD / m 3 · d), a BAF can still efficient removal of COD (an effluent COD ≈ 50mg / L) the two BAF efficient removal NH 4 -N. Final effluent COD lt; 50mg / L, NH 4 -N lt; 5mg / L. At this point, the first stage BAF backwash cycle 1d, second backwash cycle extension for 5 7 d. Nitrifying bacteria activity of the second stage BAF BAF nitrification zone than the first level of microbial activity in detail to improve. TN compliance after two BAF increased denitrification BAF. Three BAF process of processing performance the influent load nitrification liquid reflux, water temperature, and other working conditions under the. The results show that the impact of water temperature on the denitrification process without internal reflux and supplemental alkalinity, water temperature higher than 23 ° C, to achieve the effluent COD NH 4 / sub> . - N and TN the stable reached an A standard; When the water temperature 8 2 3 ° C by reducing influent load and internal reflux can achieve effluent COD the NH 4 -N and TN the stable reached an A standard.

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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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