Wang Xiao-Ling, Yuan Dong-Dan, Bai Li, Li Zi-Qi, Yu Yong, Qin Xu-Dong, Zhang Xiao-Xu, Zhao Ke
Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China.
School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China.
Huan Jing Ke Xue. 2016 Oct 8;37(10):3906-3913. doi: 10.13227/j.hjkx.2016.10.032.
Based on test results and mass balance, PHA, TP metabolic regularity was revealed under different nitrate nitrogen concentrations in main anoxic stage [(NO)] for nitrogen and phosphorus removal in single sludge system with continuous flow, then the effectiveness of using (NO) as control parameter was proved from the perspective of the reaction mechanism. During experiment period, the influent COD, total nitrogen (TN), and total phosphorus (TP) concentrations were stabilized at (285.78±18.19), (58.13±3.79), and(7.14±0.51) mg·L, respectively. The experiment was carried out under the condition that the (NO) values were 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5 and 4.0 mg·L based on the feedback control structure using PLC automatic control system to control the nitrifying liquid flow with the water quality. The sludge load of COD was (0.253±0.071)kg·(kg·d), the sludge load of TP in anaerobic stage was (0.006±0.001) kg·(kg·d), the sludge load of TN in aerobic stage was (0.049±0.006) kg·(kg·d), the hydraulic retention time (HRT) in bioreactor was 9h, the sludge recycle flow was 0.5, and the mixed liquor recycle was 1.0. The results showed that effect of (NO) value on PHA synthesis and storage rate in the ANS was conspicuous, and the percentage of PHA storage occupied 74% of COD removal when (NO) value was 2.5 mg·L.The impact of (NO) value on PHA degraded in the main anoxic stage was great, and the percentage of PHA degradation in the main anoxic stage occupied 55% of total PHA degradation when (NO) value was 2.5 mg·L. The phosphorus released in anaerobic stage changed along with increasing (NO), and the amount of phosphorus released obtained the maximum value 6.16 g·d when (NO) value was 2.5 mg·L. In addition, under (NO) value of 2.5 mg·L, the amount of total phosphorus uptake and anoxic phosphorus uptake obtained the maximum values of 8.04 g·d and 3.67 g·d, respectively. Then it was confirmed that(NO) could serve as a run controlling parameter with the best value of 2.5 mg·L from the perspective of PHA and TP metabolic mechanism.
基于试验结果和质量平衡，揭示了连续流单污泥系统中主要缺氧阶段不同硝酸盐氮浓度[(NO)]下PHA、TP的代谢规律，用于氮磷去除，进而从反应机理角度证明了以(NO)作为控制参数的有效性。试验期间，进水COD、总氮(TN)和总磷(TP)浓度分别稳定在(285.78±18.19)、(58.13±3.79)和(7.14±0.51)mg·L。基于采用PLC自动控制系统根据水质控制硝化液流量的反馈控制结构，在(NO)值分别为0.5、1.0、1.5、2.0、2.5、3.0、3.5和4.0mg·L的条件下进行试验。COD的污泥负荷为(0.253±0.071)kg·(kg·d)，厌氧阶段TP的污泥负荷为(0.006±0.001)kg·(kg·d)，好氧阶段TN的污泥负荷为(0.049±0.006)kg·(kg·d)，生物反应器的水力停留时间(HRT)为9h，污泥回流比为0.5，混合液回流比为1.0。结果表明，(NO)值对ANS中PHA合成与储存速率的影响显著，当(NO)值为2.5mg·L时，PHA储存占COD去除的比例为74%。(NO)值对主要缺氧阶段PHA降解的影响较大，当(NO)值为2.5mg·L时，主要缺氧阶段PHA降解占总PHA降解的比例为55%。厌氧阶段释放的磷随(NO)增加而变化，当(NO)值为2.5mg·L时，磷释放量达到最大值6.16g·d。此外，在(NO)值为2.5mg·L时，总磷吸收量和缺氧磷吸收量分别达到最大值8.04g·d和3.67g·d。进而从PHA和TP代谢机理角度证实(NO)可作为运行控制参数，最佳值为2.5mg·L。
