Study On Anammox-Sharon System In Treatment Of Swine Wastewater

Livestock and Poultry Industry is gradually developing to the direction of large-scale and Intensification. At the same time, the environmental pollution problems are worsening. Today there are many treatment processes for swine wastewater treatment. But most of them are difficult to be satisfied. As a new process of swine wastewater treatment, Anammox and Sharon system has many advantages. For example, the ammonia removal is well, processing cost is low. In this paper, first of all, according to summary and study before, this paper have studied the effect of anammox in UASBB reactor. Then according to the problems of Anammox and Sharon system, observed and analysised of the change of removal rate in system under different conditions of aeration, The experimental results are as follows:(1) For the anammox reactor, UASBB and UASB reactor have been existing in laboratory. The result shows the removal of COD is high, and the removal of NH4+-N and NO2--N is kept above50%. On the other hand, the removal of pollutants in UASBB is slightly better than that in UASB.When the temperature is controlled in35±1℃, the removal of NH4+-N which it's in UASBB is kept at the range of52.61%-60.88%, and the removal of NO2--N is kept at the range of53.88%-58.98%.When the temperature is controlled at25±1℃,30±1℃and40±1℃, the maximum removal of NH4+-N in UASBB respectively is31.63%,46.27%and47.48%, and the maximum removal of NO'-N in UASBB respectively is41.35%,44.33%and47.94%. All in all, the best temperature for anammox is35±1℃.When the pH was controlled in7.5-8.5, the anammox reaction is most appropriate. When the pH is controlled at about8.0, the removal of NH4+-N and NO2--N respectively is57.99%and58.98%. When the pH is lower than7.5or high than8.5, the removal of anammox is worse. In addition, the result found UASBB reactor which has outside circle and filler is stronger to adapt the change of pH than the UASB reactor.When the temperature was kept at35℃and pH was kept at about8.0, the removal of NH4+-N and NO2--N in UASB was nearly60%when HRT is36h.But the removal of NH4+-N and NO2--N of UASBB is nearly60%when HRT is24h. Th result indicated UASBB had the stronger volumetric loading,and the HRT of it is shorter than UASB.On the other hand,HRT in the anammox reactor could not be too low.When NO2--N/NH4+-N controlled in1.1～1.3,the removal of anammox is best.the maximum removal of NH4+-N in UASBB is67.17%,and the maximum removal of NO2--N in UASBB is62.2%.(2)For the Anammox-Sharon system,when the temperature is kept at35℃and pH is kept at about8.0,and circulation rate is kept at300%.If the aeration rate is200mL/min, efficiency of NH4+-N in UASBB is starting to decrease,the removal of NH4+-N in UASBB is controlled in5%-21%.The total removal of NH4+-N in the system is controlled in85%-94%.When the aeration rate is150mL/min or250mL/min,the removal of NH4+-N in UASBB and system ammonia are all seriously decline.