College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Department of Biotechnology, Amicable Knowledge Solution University, Satna, India.
Bioresour Technol. 2018 Feb;250:838-845. doi: 10.1016/j.biortech.2017.12.009. Epub 2017 Dec 8.
In this current study, sawdust and zero-valent iron (Fe) were used as co-electron donors to evaluate the effects of coexistent ions on the combined heterotrophic and autotrophic denitrification (HAD) processes. The results showed that HCO and SO drastically enhanced nitrate removal. The promotion effect derived from both biological and chemical process by HCO and chemical process by SO. However, Ca ions would remarkably increase nitrate removal due to promoting the electron transfer and the metabolic activities of bacteria, whereas the Cu ions inhibited the biological process due to the deleterious effect on bacteria. Meanwhile, Fe and Fe ions exhibited inhibition effect firstly because of their toxicity to bacteria and promotion subsequently due to their enhancement on Fe chemical denitrification. Moreover, byproducts such as nitrite, ammonium, dissolved organic carbon (DOC), etc. were also influenced by common ions.
在本研究中，木屑和零价铁（Fe）被用作共电子供体，以评估共存离子对协同异养自养反硝化（HAD）过程的影响。结果表明，HCO 和 SO 极大地促进了硝酸盐的去除。HCO 促进了生物和化学过程，SO 促进了化学过程。然而，Ca 离子由于促进电子转移和细菌的代谢活性，显著增加了硝酸盐的去除，而 Cu 离子由于对细菌的有害影响，抑制了生物过程。同时，Fe 和 Fe 离子首先表现出抑制作用，因为它们对细菌具有毒性，随后由于它们增强了 Fe 的化学反硝化作用而促进了其生长。此外，亚硝酸盐、铵、溶解有机碳（DOC）等副产物也受到常见离子的影响。
