| In this paper, the pilot test of landfill leachate of HeiMiFeng landfill was based on ASBR - two levels of SBR process, though the test of the actual landfill leachate ,the best reactor operating parameters of ASBR and SBR tanks were studied ,and the treatment effect and influencing factors of ASBR reactor and SBR reactors also studied separately.The results of the pliot scale experimept are as follows: the removal efficiency of COD(HRT=4d) was 25% to 50%, the average removal rate was 32.04%; the SS removal rate was 28% to 40% , the average removal rate was 32.63%; the TN removal rate was 8.6% to 12%, the average removal rate was 10.5%. The results showed that the increase of influent COD has little effect on the ASBR reactor treatment,but with the increase of influent concentration of ammonia nitrogen, COD removal rate decreased; hydraulic residence time(HRT) had significant effects on the ASBR treatment, the longer the HRT, the better the COD removal, but the total nitrogen removal did not increase;ASBR reactor had obvious effect on the biodegradability of leachate, and the lower the biodegradability of leachate water ,the more significant improvement of the biodegradability.Two Stage SBR system can remove organic pollutants up to 70%,even 93.6%,the average removal rate of organic was 84.2%;the removal rate of ammonia was more than 90%,the average removal rate was 97.06%; the average removal of TN was 30.92%; the average effluent SS was about 41mg/L;the best HRT of two SBR systems was 4d, a further period of HRT on the removal of organic matter to improve was limited.To determine the effects of different oxygen supplements on the nitrogen and phosphorus removal, tests show that the oxygen supply means was "stir 2h, 8h aeration stops every 2h, precipitation drainage and idle a total of 2h", the two-stage SBR system had a better removal of phosphorus, and TN removal was 28% to 40%, the average TP removal was 50%. By controlling the dissolved oxygen concentration of the SBR tank for sludge acclimation in this test to Control the nitrification stage in the trial of nitrite , and Nitrite accumulation rate was up to 80%; the test also explores the SBR SND nitrogen phenomenon,and the results showed that the simultaneous nitrification and denitrification on the contribution rate ( Nitrous SND rate) is about 55.06%。 Through the analysis of the operation datas of the ASBR reactor, we used the Monod equation and the Michaelis-Menten equation to establish a dynamic model of ASBR reactor treating landfill leachate when the temperature was 35±1 degrees,and through using linear regression we get the kinetic parameters, that was: specific degradation rate wasυmax = 0. 0085t?1, and the half rate constant is Ks =283.49. The simulation results indicate that: the dynamic model of the ASBR reactor simulated organic substrate was better, and the average error between the analog values and the measured values was 4.67%. Through the same way we establish a dynamic model of SBR reactor degenerate organic substrate and ammonia nitrate substrate are:... |
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