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Research on Nitrogen Removal and Phosphorus Recovery by the Processes of Activated Sludge Recycle-Hybrid Submerged Membrane Bioreactor

Author: WangLiPing
Tutor: ZhangLiQiu
School: Beijing Forestry University
Course: Environmental Science
Keywords: Composite membrane bioreactor Sludge outside the circle Denitrification Phosphorus recovery
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 0
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Abstract


Urban sewage nitrogen, phosphorus emissions without effective treatment that cause eutrophication, which brought huge economic losses. Its a good addition to pollution performance and excellent water quality, membrane bioreactor used in sewage treatment, the low efficiency of phosphorus removal, however, it does exist. This paper presents a new composite MBR PROCESS strengthened by adding fillers MBR denitrification sludge outside cycle anaerobic phosphorus release, phosphorus removal performance and phosphorus recovery. System for TN small pilot scale study, evaluation indicators, to determine the best value of HRT and DO: HRT in about 4.0h, DO 0.8 ~ 1.5mg / L. Static test to determine anaerobic phosphorus release: appropriate anaerobic phosphorus release time 2.0h, the optimum dosage of sodium acetate to the solution of COD concentration of 356mg / L. Sludge outside the loop the composite membrane bioreactors (ASR-HSMBR) process due to the increase of sludge outside the circle of anaerobic phosphorus release system removal efficiency of TP significantly than HSMBR process. Effluent phosphorus concentration stabilized at around 1mg / L, the basic phosphorus removal in more than 80% solve the bad MBR Phosphorus Removal disadvantages. Manual configuration of the phosphorus-rich sewage, respectively, the effects of pH, initial phosphorus concentration, ratio of materials, calcium concentration of phosphorus recovery process. Concluded: pH between 8.5 to 9.0; of Mg: N: P molar ratio of 2:2:1 is conducive to generate a MgNH4PO4 precipitate; simultaneously trial found that the higher the initial concentration of phosphorus in the more conducive to recovery; the higher the calcium ion concentration more is not conducive to the formation of struvite. In a pilot study, HSMBR average removal rate of COD and NH4-N as high as 95.3% and 90.1%, respectively. The test start early, the average removal rate of TN only about 20%. The system can be enhanced by increasing the dosage of filler denitrification performance late effluent TN concentration of 10mg / L, TN removal rate of 80% or more. System running early in the HSMBR, a basic water TP concentration between 1.0 ~ 2.0mg / L of TP removal rate of about 80%. As the test proceeds, the system TP removal declining to about 65%. Anaerobic phosphorus release process selected anaerobic stirring for about 3h 3d anaerobic phosphorus release cycle. Increased phosphorus release of the outer loop, the TP average removal rates of up to 90.2%. The TP removal effect of contrast that the ASR-HSMBR process by sludge outside the circle, to solve the the Phosphorus Removal HSMBR process does not ideal alone HSMBR process. Sludge outside the circle of anaerobic phosphorus release process does not affect the HSMBR removal of organic matter and nitrogen. By chemical precipitation in anaerobic phosphorus release full recovery of phosphorus and phosphorus-rich effluent from anaerobic phosphorus release link, so the effect of phosphorus recovery is directly influenced by the process of anaerobic phosphorus release.

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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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