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Operation Characteristics and Affecting Factors of Denitrifying Phosphatation Process Fed with Propionic

Author: LiGuanYuan
Tutor: DuMaoAn
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Propionate Denitrifying phosphorus removal Denitrifying phosphorus removal bacteria PCR-DGGE
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 0
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Abstract


Acetic acid and propionic acid the wastewater main short-chain fatty acid, propionic acid is quality carbon source for biological phosphorus removal process has been confirmed. However, there are studies on the the propionate degradation mechanism and phosphorus removal process to explore less controversial, and propionic acid could enhance the anoxic and stability. This experiment propionate as carbon source, highly efficient and stable operating conditions of the system to explore through the analysis of different operating conditions and the influencing factors. Transformation kinetics and microbial properties of the system and matrix analysis. Propionate as carbon source to achieve the success of the A / A-SBR denitrification and phosphorus removal reactor Quick Start denitrifying phosphorus removal bacteria enrichment of the good, the reaction system quickly achieve the desired treatment effect. Acetic acid and propionic acid, respectively, compared denitrifying phosphorus removal performance of the process as the carbon source. Propionic acid as a carbon source is more conducive to the efficient and stable operation of the denitrification and phosphorus removal system. The stable operation denitrifying biological phosphorus removal system has good performance of denitrifying phosphorus and nitrogen removal, phosphorus and nitrogen removal efficiency of 98% and 96%, respectively while the COD removal rate of more than 86%. Compared with acetate as the carbon source phosphorus removal rate 5 percent higher to each absorption 1mgPO43 - P about consumption 1mgNO3 - N. The comparative analysis of the operation carried out under anaerobic / aerobic, anaerobic / anoxic end of aeration, anaerobic / anoxic conditions. It was found that: a simple A / A-SBR system is long-running, COD and phosphorus removal rate decreased sludge yield decline, the system phosphorus removal function gradually lose. Increase the 0.5h secondary aerobic stage, the system can achieve long-term stable operation of the phosphorus removal rate can reach 98%. Phosphorus removal process of influencing factors. Found that the carbon source, pH, nitrate, SRT, after aerobic time efficient denitrifying phosphorus removal system of long-term stable operation to have a greater impact. Of this test is to determine the optimal reaction conditions: COD (propionic acid) 300mg / L NO3 - N concentration of 70 mg / L, PO43 - P concentration 18mg / L, PH = 7, SRT = 20d, auxiliary aerobic time of 0.5h. Using PCR-DGGE SPSS software, scanning electron microscopy and clone sequencing technology process in microbial community characteristics, species classification, function flora similar and community succession process. Microbial community structure and operation of the process more consistent performance change course; denitrifying phosphorus removal system the flora will decline and denitrifying bacteria blooms caused by the changes in the structure of biological communities is caused by denitrification the main cause of the loss of phosphorus function. Each characteristic pollutant degradation fitting equation solved by degradation of COD and phosphorus and various operational phase typical cycle dynamics analysis, and degradation coefficient. The fitted values ??in good agreement with the measured values ??are consistent with the experimental phenomena; flora changes in the structure fitting results with the actual process of running effects and reaction system mutual authentication to prove the accuracy of the experimental results.

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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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