DOI: 10.15986j.1006-7930.2019.02.019
为了探究信号分子对厌氧同步脱氮除硫的影响,本文采用信号分子OHHL(N-3-oxo-hexanoyl-homoserine-lactone),在两种进水硫化物浓度(100 mg/L和200 mg/L)条件下,研究OHHL浓度对脱氮除硫的影响.结果表明,在进水硫化物浓度为100 mg/L条件下,信号分子OHHL投加浓度为1.5 μM时硫化物和硝酸盐在反应进行36 h时的去除率高达99.0%、96.1%,单质硫产量高达60 mg/L,远高于未投加信号分子及投加浓度为1.0 μM、2.0 μM的体系.可见投加信号分子可以促进硫化物和硝酸盐的去除,提高单质硫产量.这是由于投加信号分子时(1.5 μM)体系中的总菌数量大幅度提高至1.1 * 105 CFU/mL,远高于其他条件下的相应值(2.6 * 104 ～7.0 * 104 CFU/mL),增强了异养反硝化作用.此外,进水硫化物浓度为200 mg/L时,需要延长反应时间至72h才可达到较高(91.7%)的硝酸盐去除效果.
The subject of this study is to investigate the effect of signal molecules on anaerobic simultaneous denitrification and desulfurization. Four concentrations(0 μM, 1.0 μM, 1.5 μM and 2.0 μM)of N-3-oxo-hexanoyl-homoserine-lactone(OHHL)were applied to explore the effect of OHHL concentration on simultaneous removal of nitrate and sulfide with 100 mg/L or 200 mg/L of sulfide influent. The results suggested that when the influent sulfide concentration was 100 mg/L, sulfide and nitrate removal efficiencies reached 99.0% and 96.1% with the application of 1.5 μM OHHL after 36 h reaction. Meanwhile, the yield of elemental sulfur was as high as 60 mg/L, much higher than that with 0 μM, 1.0 μM and 2.0 μM OHHL amended. The above results indicated that the removal of sulfide and nitrate and the yield of elemental sulfur were enhanced with the application of OHHL. The possible explanation was that with the addition of 1.5 μM OHHL, the total population of bacteria substantially increased to 1.1 * 105 CFU/mL, which was significantly higher than the corresponding values(2.6 *104 ～7.0 * 104 CFU/mL)under the other conditions, thus leading to an enhancement of the heterotrophic denitrification. Moreover, as the influent sulfide concentration was increased to 200 mg/L, the extent of reaction time(72 h)was necessary to obtain a relatively high nitrate removal efficiency(91.7%).
