有机碳源对厌氧氨氧化污泥颗粒化的影响

Effect of organic carbon source on granulation of anaerobic ammonia oxidation sludge

摘要:

为探究有机碳源对厌氧氨氧化(Anammox)污泥颗粒形成的影响，采用两组平行的SBR，通过改变进水中有机碳源的质量浓度进行研究.结果表明：适量的有机碳源(< 130 mg/L)可通过提高反应器中的胞外聚合物(EPS)含量从而加速颗粒污泥的形成，提高污泥的沉降性能.添加与不添加有机碳源的两组反应器分别于28和35 d颗粒化成功，平均颗粒粒径分别达450和409 μm.过量有机碳源(>230 mg/L)会使污泥出现解体，粒径减小，污泥的沉降性能明显变差.当有机碳源小于110 mg/L时，可通过反硝化作用促进厌氧氨氧化反应从而提高脱氮效率；但是当有机碳源质量浓度大于110 mg/L时，会抑制厌氧氨氧化反应，并降低脱氮效率.在厌氧氨氧化工艺实际运行中，应避免有机物质量浓度超过110 mg/L.

Abstract:

The effect of organic carbon source on the granulation of anaerobic ammonium oxidation (Anammox) sludge was tested in two parallel SBRs by gradually increasing the concentration of organic carbon source (R1) and by adding no organic carbon (R2). Results showed that appropriate concentration of organic carbon source (< 130 mg/L) increased the amount of extracellular polymer (EPS) in the reactor and consequently accelerated the formation of granular sludge and enhanced sludge settling performance. Sludge in the two groups was granulated at 28 and 35 days and the particle sizes were 450 μm and 409 μm, respectively. However, excessive organic carbon sources (> 230 mg/L) disintegrated sludge, reduced particle size, and worsened sludge settling performance significantly. Organic carbon source with a concentration lower than 110 mg/L promoted the anaerobic ammonia oxidation by denitrification, thereby improving N-removal efficiency. In contrast, when the concentration of organic carbon source was higher than 110 mg/L, anaerobic ammonia oxidation was inhibited and N-removal efficiency was decreased. Therefore, the concentration of organic carbon source should be equal to or lower than 110 mg/L during the operation of Anammox reactor.