NaCl盐度波动对处于污泥膨胀的耐盐脱氮污泥沉降性能的影响

以处于污泥膨胀的耐盐脱氮污泥为研究对象，分别采用有效容积为2和240L的SBR装置（编号1#和2#），在进水NH3-N浓度为40—100mg／L，pH为7．45～8．0，溶解氧为3～5mg／L，温度为28～30℃的条件下，分别研究不同NaCl盐度（0、10、20和30g／L）对污泥沉降性的影响。实验结果表明，在NaCl盐度条件下，可以明显改善耐盐脱氮污泥的沉降性。NaCl盐度越高，污泥絮凝体体积减小、丝状菌及原生动物减少趋势越明显，污泥沉降性效果越好。在30g／L盐度时，1#和2#SBR的SV30分别从95％和80％降至53％和30％，SVI分别从185．5和170．8mL／g降至127．3和78．4mL／g。

Effects of salinity on salt-tolerant denitrifying sludge settling performance

The sedimentation performances of salt-tolerant denitrifying sludge at the stage of bulking were studied in a 2 L SBR reactor and 240 L reactor（labeled as 1#and 2#） ,respectively. Both the reactors were opera- ted under the following conditions： the influent NH3-N concentration of 40 -100 mg/L,pH of 7.45 -8.0,DO of 3 -5 mg/L and the temperature of 28 -30℃. The effect of the different salinities（0 g/L,10 g/L,20 g/L,30 g/ L） on the precipitation performance of the sludge was investigated. The results showed that the salinity signifi- cantly improved the sedimentation ability of sludge. With the increase of the salinity,the volume of the zoogloea reduced and the quantity of filamentous bacteria and protozoa in the sludge obviously decreased. As a result the sedimentation ability of the sludge was improved. When the salinity reached 30 g/L, the SV30decreased from 95 % and 80% to 53% and 30% , respectively for the 1#and 2#SBR reactor,and the SVI value decreased from 185.5 and 170.8 mL/g to 127.3 and 78.4 mL/g,respectively.