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Research on Characteristics of Half-Nitrosofication Using Moving Bed Biofilm Reactor and Start-Up of ANAMMOX Reactor

Author: YuGuangLu
Tutor: SunDeZhi
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: SHARON Anammox Landfill leachate Semi - nitrosated Dynamics
CLC: X703.1
Type: Master's thesis
Year: 2007
Downloads: 218
Quote: 1
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Abstract


Urban landfill leachate contains a high concentration of ammonia nitrogen, and with the growth of the landfill field age and continuously improve the environmental pollution is very serious, therefore, resulting in a the landfill leachate difficult process to meet emission standards. In this thesis denitrification treatment of landfill leachate using of SHARON and anaerobic ammonia oxidation combined effects of the two-stage process. In this paper, the aerobic moving bed biofilm reactor start SHARON process, wastewater effluent treatment of landfill leachate using anaerobic methanogenic reactor seed sludge was taken from the municipal nitrifying sludge. Intermittent operation of the reactor week, filler hang a thin layer on the surface of the biofilm, and then continuous operation successfully started three weeks reactor, ammonia removal rate reached 93.92%, nitrite accumulation rate of 94.97%. SHARON reactor half nitrosated in order to match the water requirements of the anammox system, through visits influent ammonia concentration, DO and pH value of the semi-nitrosated The results show that: pH value and DO is the important parameter to obtain the reactor half nitrosated effect, especially the pH value, the cooperative control of the appropriate concentration of DO control pH = 7.0, and then, the reactor can be stably achieved half nitrosated. Influent concentration were 500mg / L and 300mg / L, a suitable DO of 1.5mg / L and 1.0mg / L respectively. And through the biofilm indirect activity test and MPN counting reveals two aspects from the indirect and direct the SHARON reactor higher nitrite accumulation essence because of the moving bed biofilm process can selectively fixed and accumulation of ammonia oxidizing bacteria . This paper also examines the impact of different DO and pH on the kinetic parameters SHARON reactor experiments show that ammonia nitrogen removal of the reactor dynamics meet the Haldane model test calculated saturation constant Km, the maximum degradation rate Vmax and the inhibition constant Ki. This paper also uses a high load method and aerobic precoating low load compared to the start of the anammox reactor. The results show that the high-load method failed to start may be due to high nitrite and free ammonia concentration is due to the strong inhibition of anammox microorganisms. The low load Law reactor startup success, ammonia and nitrite removal rate reached 100% after three months, three nitrogen conversion ratio of 1:1:0.42. The test proved that the pH can be used as the anammox reactor startup process indicates parameters anammox microorganisms dominant performance in the reactor effluent pH values ??higher than the influent. Seen by scanning electron microscopy of the two reactor biofilm complicated high load reactor biofilm species, dominant population is not obvious; low load reactor biofilm spherical bacteria bacillus anammox microorganisms become dominant populations. Finally, anaerobic ammonia oxidation reactor influent load test control influent ammonia and nitrite concentration of less than 800mg / L, the removal rate can be approximated to 100%.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Technology and methods
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