基于MBBR的CANON工艺处理消化液中试启动

基于移动床生物膜反应器（MBBR）成功启动了自养脱氮工艺（CANON）处理污泥消化上清液.采用8.55m³中试系统，反应器内部填充SPR-Ⅲ填料，填充率44%，通过动态流接CANON污泥（接种比例<1%），经过70d成功启动CANON工艺.运行至200d，TN去除负荷稳定在0.9kgN/（m³·d），出水氨氮浓度均值63.9mg/L，氨氮和总氮去除率均值分别为91%和85%.进水中存在的少量有机物使系统同时存在反硝化和厌氧氨氧化两种脱氮途径，促进了总氮的去除，对总氮去除的贡献分别占5%~7%和93%~95%.通过对pH值和曝气强度的控制，防止了悬浮载体结垢，平衡了DO、曝气强度以及生物膜厚度三者之间的关系，使生物膜始终处于适宜的厚度，稳定了系统的处理效果.高通量测序表明悬浮载体上的优势菌种为氨氧化菌（AOB）和厌氧氨氧化菌（AnAOB），其丰度整体呈增长趋势，至稳定运行期可达到17%和14%.系统无NOB存在，短程硝化效果良好，反硝化菌群丰度在2%~3%并相对稳定，进水中存在的少量有机物不会影响厌氧氨氧化菌的增殖.

Pilot scale start-up of CANON disposal sludge-digestion wastewater treatment based on MBBR

This article reported the start-up process of sludge digestion supernatants treatments by CANON process based on MBBR reactor. The pilot system with a volume of 8.55m³ was used and filled with SPR-Ⅲ filler, which had a filling rate of 44%. The CANON process was successfully started after 70d with dynamic inflow of CANON sludge, and the inoculation ratio was below 1%. After 200d, the TN removal volumetric loading was stable at 0.9kgN/(m³·d), the mean value of the concentration of effluent ammonia nitrogen was 63.9mg/L, and the removal rate of ammonia nitrogen and total nitrogen were 91% and 85% respectively. The N-removal pathway ofdenitrificationand anaerobic ammonium oxidation occurred simultaneously due to small amount of organic matter presence in the influent, which accounted for 5% to 7%and 93% to 95% of total nitrogen removal, respectively. By controlling of pH and aeration intensity, the scaling of suspended carriers was prevented and the relationship among DO, aeration intensity and biofilm thickness was balanced. As a result, the biofilm always maintained suitable thickness, which stabilized the treatment effect of the system. The high flux sequencing indicated that AOB and AnAOB were dominant species on the suspended carriers, and their abundance reached 17% and 14% during steady operation. There was no NOB in the system, indicating that the short-nitrification effect was good. The denitrifying bacteria abundance was 2%~3% and relatively stable, indicating that the small amount of organic matter in the influent did not affect the increase of anammox bacteria.