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The Study on the Realization and Performance of Denitrifying Phosphorus Removal in A~2/O Process

Author: CaoXueMei
Tutor: PengYongZhen
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Denitrifying phosphorus removal Denitrifying phosphorus removing bacteria (DPAOs) A2 / O process COD / TN Nitrification
CLC: X703
Type: Master's thesis
Year: 2007
Downloads: 813
Quote: 12
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Abstract


To promote A 2 / O technology research and development, in particular to promote their low C / N ratio of wastewater treatment application, the subject to artificial sewage was treated, combined with the continuous flow model test the first comprehensive and systematic study of the A 2 / O process to achieve the feasibility of denitrifying phosphorus and nitrogen removal, the operating conditions and water conditions on the effect of process operation and the role of pH, ORP In the variation of the reactor, and the ORP as denitrification and phosphorus removal process can control parameters are discussed. On this basis, examined through the low dissolved oxygen control method to achieve the possibility of nitrification and denitrification and phosphorus removal feasibility of short-range, and nitrite on denitrifying phosphorus removal was studied. In the stable operation of the A 2 / O denitrifying phosphorus removal system, first discussed the influent COD / TN on A 2 / O process of denitrifying phosphorus and nitrogen removal effect. The results show that A 2 / O denitrifying phosphorus removal system is more suitable for handling COD / TN 4 to 7 sewage, while the ratio is more in line with our sewage C / N ratio, which will make A 2 / O technology popularization and application in our broader prospects. A 2 / O system, the long run results showed that the influent COD / TN, SRT and MLSS, mixed reflux ratio and sludge reflux ratio will affect the A 2 / O nitrogen and phosphorus removal system. When the COD / TN controlled to about 6.45, SRT controlled 15d, mixed reflux ratio and sludge reflux ratio of 300% and 60%, anaerobic tank, anoxic and aerobic pool MLSS maintained at 3000mg / L ~ 3800mg / L, between the reactor and the three MLSS value closer (ratio close to 1:1:1), nitrogen and phosphorus removal system can simultaneously achieve the best condition. In the above test, based on the derivation set up A 2 / O system dynamics model denitrifying phosphorus removal. In addition to the anoxic zone and aerobic zone volume ratio for A 2 / O denitrifying phosphorus removal of nitrogen and phosphorus removal system were studied. Found that when the anoxic zone and aerobic zone volume ratio increases, the system's water effects better. While increasing the anoxic zone and aerobic zone volume ratio should be adjusted appropriately internal recycle ratio, the anoxic zone has sufficient electron acceptor, or occurrence of secondary phosphorus release phenomenon. Anaerobic and anoxic absolute size of the pool ORP anaerobic phosphorus release and anoxic phosphorus uptake effect there is a certain correlation between the ORP can be a good indication of line detection system of anaerobic phosphorus release and anoxic phosphorus extent. Hypoxia and finally cell room nitrate concentration and ORP value of the cell room there is a certain correlation between the resistance, the higher the concentration of nitrate, ORP value is higher, the size can be determined dynamically by the ORP recirculation flow within the system adequacy, which is made whether to increase or reduce the recirculation flow within the judgment. Therefore, ORP and DO proposed joint monitoring and control can be effectively achieved A 2 / O system is running stable. In addition, pH value can be used as an indication of the state of the reaction parameters, but does not consider it as A 2 / O process control parameters. Aerobic zone controlled by dissolved oxygen in 0.5 ~ 0.7mg / L, between the A 2 / O process started successfully nitrification and denitrification, NO 2 - / (NO 2 - NO 3 - ) up to 89.8%, effluent quality national emission standards. Nitrification in the aerobic zone under the conditions, the system maintains denitrifying phosphorus removal phenomenon, but denitrifying phosphorus removal in the percentage of total P uptake when compared with full nitrification declined, the average anoxic phosphorus removal rate was 44%. For nitrification arising from the impact of nitrite on phosphorus findings show that in this trial involved anoxic zones nitrite concentration (lt; 5mg / L) on denitrifying phosphorus removal does not inhibit; simultaneously nitrite can be used as proof of denitrifying phosphorus removal electron acceptor; This test involves nitrite concentration on the inhibition of aerobic phosphorus uptake rate, analysts believe that is due to nitrite poisoning effect on the PAO has caused.

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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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