基质质量浓度对不同载体UAF B-Anammox反应器脱氮性能的影响

为了研究厌氧氨氧化膜生物反应器运行的稳定性,利用3个分别以组合填料、聚氨酯泡绵和立体弹性纤维作为填料的上流式固定床(up-flow anaerobic fixed bed,UAFB)生物膜反应器,以人工配水为研究对象,考察了进水基质(NH_4~+-N、NO_2~--N)质量浓度对不同生物载体反应器脱氮效能及挂膜效果的影响.结果表明:与聚氨酯泡绵和立体弹性纤维相比,添加组合填料的反应器耐基质质量浓度冲击能力最强.随着基质质量浓度的增加,其对NH_4~+-N及NO_2~--N的去除率呈先降低后上升的趋势.当基质质量浓度均达226 mg/L时,两者的去除率分别为76.37%和77.53%,氮去除负荷为1.32kg·N/(m~3·d).含聚氨酯泡绵填料的反应器在最大基质质量浓度下NH_4~+-N和NO_2~--N去除率仅为44.90%和41.41%.添加立体弹性纤维填料的反应器的脱氮稳定性介于前两者之间.组合填料具有较高的比表面积和较好的亲水性,易于微生物附着生长且不易脱落;而聚氨酯泡绵填料比表面积及表面粗糙度均低于组合填料,且微生物截留能力较低,导致其受到冲击后生物膜易脱落,故其耐基质质量浓度冲击能力最差;立体弹性纤维表面粗糙度高利于微生物附着,但亲水性差且对微生物亲和性低,易发生膜损失.

Effect of Substrate Concentration on UAFB-Anammox Reactors With Different Carriers

To study the stability of anaerobic ammonium oxidation ( Anammox) bioreactor, three up-flow anaerobic fixed bed ( UAFB ) bioreactors with different carriers ( combined carrier, polyurethane foam carrier and elastic fiber carrier) were set-up with artificial water. The effects of substrate concentration on nitrogen removal and biofilm formation were investigated. Results show that with the polyurethane foam and elastic fiber, the reactor with combined carrier has more stable performance and stronger ability in resistance of high substrate concentration. With the increase of the substrate concentration, the removal rate of NH4+-N and NO2--N of the reactor with combined carrier shows an upward trend after the first drop. When the substrate concentration reaches 226 mg/L, the NH4+-N and NO2--N removal rates are 76. 37% and 77. 53%, respectively, and nitrogen removal loading rate is 1. 32 kg·N/(m3·d). The nitrogen removal rate of the reactor with polyurethane foam carrier is impacted by the substrate concentration significantly. The NH4+-N and NO2--N removal rates are only 44. 90% and 41. 41% at the maximum substrate concentration. The performance of the reactor with elastic fiber carrier is between the former two. Combined carrier had large surface area and high hydrophilic, which makes it easy for the microbe to grow and connect biofilm closely. The ability in resistance of high substrate concentration is the worst, which attributes to lower surface area, roughness and the low microbial interception capacity. Elastic fiber carrier has a high surface roughness which is beneficial for microbe to grow, however the hydrophilcity is low and the biofilm is easy to wash off.