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Research of Nitrogen and Phosphorous Strengthen Removal Technology of Town Sewage by MBBR

Author: ShenYanQun
Tutor: YangYuePing
School: Zhejiang University
Course: Environmental Engineering
Keywords: MBBR Nitrogen and phosphorus removal Urban sewage Pilot Study
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 275
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Abstract


Urban sewage and to strengthen the study of the nitrogen and phosphorus removal treatment technology, this paper MBBR filler election than hanging film, screened with suitable hydraulic characteristics and high nitrogen and phosphorus removal fillers, in-depth study of all kinds of factors that affect the MBBR run performance aims in reference and theoretical basis for the development of new MBBR enhanced nutrient removal process and wastewater treatment plant upgrade. Filler (YR-1 and BC250) trial found hanging membrane aeration filler YR-1 fluidized better performance, while packing BC250 fluidized poor performance fillers appear suspended accumulation, poor contact with wastewater exist perched water zone and backwater zone. From the hanging film speed, pollutant removal effect and investment economics point of view, the filler YR-1 suitable biofilm domesticated and process conditions to optimize experimental. Control influent water quality and regulate the amount of aeration, nitrifying bacteria enrichment (doubling time for 3.16d). COD and ammonia removal rate increased significantly to 50 d, 88.1% and 66.3%, respectively. The scanning electron microscopy results show the number of bacteria in the biofilm and the variety that biofilm domesticated mature biofilm. Fill rate (PR), hydraulic retention time (HRT), dissolved oxygen (DO) and carbon source nitrogen and phosphorus removal efficiency impact of the MBBR process. Conditions of test results: PR = 30% ammonia and TN removal rate of up to 87.8% and 31.5%; HRT = 6h when BST = BSs (1164.3 mg / L) BSM (2885.3 mg / L) realization of COD, ammonia nitrogen and TN 96.7%, 95.8% and 45.7% place rate; DO = 3.0 ± 0.25 mg / L, the highest biomass attached to the reactor system, suspended sludge concentration minimum, the highest total nitrogen removal efficiency reached 70.4%; With forward to C / N and C / P ratio increases, TN and TP removal rate on the rise, and will certainly help with the improvement of the carbon source nitrogen and phosphorus removal. 30% fill rate, control HRT = 6h, DO = 3.0 ± 0.25mg / L conditions, are domesticated and MBBR processing urban analog sewage can achieve simultaneous nitrification and denitrification cut carbon effect, COD removal of 92.4% on average. average, ammonia removal of 85.8%, TN removal 70.4% on average. MBBR treatment of urban sewage coupling process in a pilot plant, the total hydraulic retention time of 16.3h, MBBR pool of dissolved oxygen 1.5-2.5 mg / L, run four months under the water purification efficiency of COD average below 81.5 mg / L; of BOD5 output level was 15 mg / L; ammonia effluent average of less than 2 mg / L; the TN average effluent to less than 25 mg / L,; the TP out level was 1.78 mg / L. Reach the discharge standard (GB18918-2002).

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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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