Zhao Lanmei, Zhang Congcong, Lu Zhiyang, Bao Mutai, Lu Jinren
Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Bioresour Technol. 2020 Jun;306:123089. doi: 10.1016/j.biortech.2020.123089. Epub 2020 Feb 28.
Dissolved oxygen (DO) played a short board effect on nitrogen biotransformation and pollutant metabolism. This study for the first time explored the key role of different levels of DO (covering anaerobic, anoxic and aerobic) on hydrolyzed polyacrylamide (HPAM) bioconversion. HPAM was metabolized to intermediates with different chain length. Volatile fatty acid (VFA) production rose first and then descended with DO concentration (0-2 mg·L), and the maximum reached 92.5 mg·L when DO was 0.5 mg·L. Total nitrogen (TN) removal increased first and then dropped with DO concentration, and the maximum (61.4%) occurred at 0.5 mg·L DO. NH-N dipped from 42.8 to 0 mg·L and NO-N rose from 0 to 32.8 mg·L with DO concentration. The changes of enzyme activities were consistent with those of VFA production and TN removal, which were related to HPAM metabolism and N bioconversion. Microbial function was correlated to HPAM metabolism, N bioconversion and key enzyme.
溶解氧（DO）对氮的生物转化和污染物代谢具有短板效应。本研究首次探讨了不同溶解氧水平（涵盖厌氧、缺氧和好氧）对水解聚丙烯酰胺（HPAM）生物转化的关键作用。HPAM被代谢为不同链长的中间体。挥发性脂肪酸（VFA）产量随溶解氧浓度（0 - 2 mg·L）先升高后下降，当溶解氧为0.5 mg·L时达到最大值92.5 mg·L。总氮（TN）去除率随溶解氧浓度先升高后下降，最大值（61.4%）出现在溶解氧为0.5 mg·L时。随着溶解氧浓度升高，NH-N从42.8 mg·L降至0 mg·L，NO-N从0 mg·L升至32.8 mg·L。酶活性的变化与VFA产量和TN去除率的变化一致，这与HPAM代谢和氮生物转化有关。微生物功能与HPAM代谢、氮生物转化和关键酶相关。
