Bi Chun-Xue, Yu De-Shuang, Du Shi-Ming, Wang Xiao-Xia, Chen Guang-Hui, Wang Jun, Gong Xiu-Zhen, Du Ye-Qi
School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
Huan Jing Ke Xue. 2019 Feb 8;40(2):783-790. doi: 10.13227/j.hjkx.201806166.
In order to explore the characteristics of nitrite accumulation during the operational period of partial denitrification in different sludge sources using sodium acetate as a carbon source, No.1 SBR and No.2 SBR were used to inoculate with surplus sludge taken separately from a secondary sedimentation tank of a sewage treatment plant and simultaneous nitrification and denitrifying phosphorus removal system. By reasonably controlling the initial nitrate concentration and anoxic time, partial denitrification was realized. The carbon and nitrogen removal characteristics under different initial COD and NO-N concentrations were investigated. The results showed that, using sodium acetate as the carbon source, the partial denitrification process in No.1 SBR and No.2 SBR sludge successfully began in 21 d and 20 d, respectively. The accumulation of NO-N and nitrite accumulation rate (NAR) in reactors were maintained at high levels (12.61 mg·L, 79.76% and 13.85 mg·L, 87.60%, respectively). When the initial NO-N concentration of No.2 SBR was 20 mg·L and the initial COD concentration increased from 60 mg·L to 140 mg·L, the operation time for achieving the highest NO-N accumulation in the system was shortened from 160 min to 6 min. The NO-N ratio of the denitrification rate (in VSS) increased from 3.84 mg·(g·h) to 7.35 mg·(g·h). Increased initial COD concentration was beneficial to the accumulation of NO-N during partial denitrification. When the initial COD concentration of No.2 SBR was 100 mg·L and the initial NO-N concentration increased from 20 mg·L to 30 mg·L, NAR was maintained above 90% and up to 100% (the initial NO-N concentration was 25 mg·L). When the initial NO-N concentration was ≥ 35 mg·L, insufficient COD caused NO-N to be completely reduced to NO-N. Under different initial COD concentrations (80, 100, or 120 mg·L) and different initial NO-N concentrations (20, 25, 30, or 40 mg·L), the nitrogen and carbon removal and partial denitrification performance of the No.2 SBR was better than that of No.1 SBR.
为探究以乙酸钠为碳源时不同污泥来源的部分反硝化运行期间亚硝酸盐积累特性，采用1号SBR和2号SBR分别接种取自某污水处理厂二次沉淀池的剩余污泥以及同时硝化反硝化除磷系统的污泥。通过合理控制初始硝酸盐浓度和缺氧时间，实现了部分反硝化。研究了不同初始COD和NO-N浓度下的碳氮去除特性。结果表明，以乙酸钠为碳源时，1号SBR和2号SBR污泥中的部分反硝化过程分别在第21天和第20天成功启动。反应器中NO-N的积累量和亚硝酸盐积累率（NAR）维持在较高水平（分别为12.61mg·L、79.76%和13.85mg·L、87.60%）。当2号SBR的初始NO-N浓度为20mg·L且初始COD浓度从60mg·L增加到140mg·L时，系统达到最高NO-N积累量的运行时间从160min缩短至6min。反硝化速率（以VSS计）的NO-N比从3.84mg·(g·h)增加到7.35mg·(g·h)。提高初始COD浓度有利于部分反硝化期间NO-N的积累。当2号SBR的初始COD浓度为100mg·L且初始NO-N浓度从20mg·L增加到30mg·L时，NAR维持在90%以上，最高可达100%（初始NO-N浓度为25mg·L时）。当初始NO-N浓度≥35mg·L时，COD不足导致NO-N被完全还原为NO-N。在不同初始COD浓度（80、100或120mg·L）和不同初始NO-N浓度（20、25、30或40mg·L）下，2号SBR的脱氮除碳及部分反硝化性能均优于1号SBR。
