Department of Civil and Environmental Engineering, Pusan National University, 609-735 Busan, South Korea. [corrected]
Water Sci Technol. 2010;62(6):1440-7. doi: 10.2166/wst.2010.375.
Since spent sulfidic caustic (SSC) produced from petrochemical industry contains a high concentration of alkalinity and sulfide, it was expected that SSC could be used as an electron donor for autotrophic denitrification. To investigate the nitrogen removal performance, a pilot scale Bardenpho process was operated. The total nitrogen removal efficiency increased as SSC dosage increased, and the highest efficiency was observed as 77.5% when SSC was injected into both anoxic tank (1) and (2). FISH analysis was also performed to shed light on the effect of SSC dosage on the distribution ratio of nitrifying bacteria and Thiobacillus denitrificans. FISH results indicated that the relative distribution ratio of ammonia-oxidizing bacteria, Nitrobacter spp., Nitrospira genus and Thiobacillus denitrificans to eubacteria varied little with the pH of the tanks, and SSC injection did not give harmful effect on nitrification efficiency. These results show that SSC can be applied as an electron donor of autotrophic denitrification to biological nitrogen removal process effectively, without any inhibitory effects to nitrifying bacteria and sulfur-utilizing denitrifying bacteria.
由于石化行业产生的废硫代苛性碱（SSC）含有高浓度的碱度和硫化物，因此预计 SSC 可以用作自养反硝化的电子供体。为了研究氮去除性能，进行了中试规模的 Bardenpho 工艺试验。随着 SSC 投加量的增加，总氮去除效率提高，当 SSC 注入缺氧池（1）和（2）时，观察到最高效率为 77.5%。还进行了 FISH 分析，以阐明 SSC 投加量对硝化菌和 Thiobacillus denitrificans 分布比的影响。FISH 结果表明，氨氧化菌、Nitrobacter spp.、Nitrospira 属和 Thiobacillus denitrificans 相对于真细菌的相对分布比随池的 pH 值变化不大，SSC 注入对硝化效率没有有害影响。这些结果表明，SSC 可以有效地作为自养反硝化的电子供体应用于生物脱氮工艺，对硝化菌和硫利用反硝化菌没有任何抑制作用。
