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Coupling Cultivation of Aerobic and Anaerobic Ammonium Oxidation Bacteria and Influence by NO2

Author: CongLiYing
Tutor: ZhangDaiJun
School: Chongqing University
Course: Environmental Engineering
Keywords: Aerobic ammonia oxidation Anammox Completely autotrophic denitrification The NO2 to strengthen autotrophic denitrification Granular sludge
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 226
Quote: 1
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Abstract


Aerobic ammonia oxidation and anaerobic ammonia oxidation coupled granular sludge completely self nitrogen removal with conventional nitrification and denitrification process can be reduced compared to 60% O 2 consumption and non-consumption of COD can significantly reduce biological nitrogen removal process energy consumption and CO 2 emissions. By EGSB continuous running test the SBR reactor batch experiments and microscopic observation, limited study of aerobic and anaerobic ammonia oxidation coupled granular sludge DO under completely from nitrogen removal mechanism and influencing factors; the study adding trace NO 2 strengthen the bioreactor completely autotrophic denitrification characteristics; study dosing of activated carbon powder reactor denitrification performance and particle effects. Aerobic ammonia oxidation sludge and anammox sludge in EGSB reactor inoculated simultaneously completely autotrophic denitrification granular sludge culture controlled at pH 7.6 ~ 8.0, DO controlled at 0.6 to 0.8 mg / L, The increased flow rate of 4.2m / h. Reactor after more than 120 days to run, NH 4 -N removal efficiency of 75% of the total nitrogen removal efficiency of 52%, and total nitrogen removal rates up to 0.101 kg / (m 3 · d). ② batch experiment NH 4 -N concentration, DO concentration and pH characteristics of granular sludge completely autotrophic denitrification. Aerobic ammonia oxidation and anaerobic ammonia oxidation rate within a certain range with NH the 4 -N concentration increases. Excessive DO nitrite oxidation rate increased anaerobic ammonia oxidation is inhibited, the reactor total nitrogen removal efficiency reduce NO 2 - and the NO 3 < sup> - cumulative; aerobic ammonia oxidation rate decreases lower the DO, NO 2 - generation rate is low, limiting the anammox improve, resulting in a total nitrogen removal rate low, but the total nitrogen removal efficiency NO 2 - and NO 3 - accumulated less. When the ammonia nitrogen concentration of 60 mg / L, DO 0.4 0 .6 mg / L total nitrogen removal rate of 27.96 mg / (gMLSS · d), total nitrogen removal efficiency of 68%. The suitable pH will help improve the performance of granular sludge from a pH of 7.8, total nitrogen removal rate maximum. (3) SBR reactor the batch experimental methods to study trace NO 2 completely from the nitrogen removal characteristics of granular sludge. The O 2 the ammonia oxidizer NO 2 type ammonia oxidation can be used Andrews equation description of the the largest ammonia degradation rate of 5.36 mg / (g · h). The existence O 2 , NO / NO 2 formation of NOx cycle can strengthen aerobic ammonia oxidation process, the conventional aerobic ammonia oxidation process and NO 2 strengthening aerobic ammonia oxidation process simultaneously. When the DO concentration of 1.5 ~ 2.0mg / L, NO 2 4.475 mmol / m 3 , the maximum degradation rate of ammonia nitrogen to 161.21 mg / (gh). (4) the EGSB reactor dosing activated carbon powder, to study its impact on the denitrification performance of the reactor and particle effects. Dosing of activated carbon NH 4 -N and TN removal efficiency reached 85%, 59%, compared with and without activated carbon to improve; total nitrogen removal rate of 0.10 kg / (m 3 · d), compared with un-activated carbon is basically the same. Not speculative activated carbon powder, the average particle size of the sludge particles are mainly distributed in the 0.5 to 1.0mm; dosing of activated carbon powder completely autotrophic denitrification granular sludge granulation effect, the average particle size of the sludge particles are mainly distributed in 0.8 ~ 1.2, a 33% increase in the average particle size of the sludge particles.

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