在硫自脱过程中,pH对NO2-和S0方向积累的动态反应
Pengze Dang1, Yayi Wang2, Chen Lyu3
1School of Environmental Science and Technology, Suzhou University of Science and Technology, Suzhou, 215009, China.
Journal of environmental management
|June 25, 2025
概括
在双快切硫自脱 (DSSADN) 中优化pH值是和硫去除的关键. 该研究发现,pH值8.5最大限度地减少了酸盐和硫副产品的去除,提高了工艺效率.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 部分化-安纳莫克斯 (PN/Anammox) 产生酸盐 (NO3--N) 和硫酸盐 (SO42-) 的副产品.
- 双捷径硫自脱 (DSSADN) 可以将NO3--N转化为酸盐 (NO2--N) 并减少SO42-污染.
研究的目的:
- 在不同的pH下,研究DSSADN中和硫的转化过程.
- 确定元素硫 (S0) 和NO2-N.同步积累的最佳pH值.
主要方法:
- 在硫自脱 (SADN) 系统中调整方向的pH值.
- 监控的酸盐-N去除率 (NaRR),硫化物-S去除率 (S2-RR),NO2-N和S0积累.
- 分析了功能性基因拷贝数 (nirK, soxB) 和微生物社区结构.
主要成果:
- NaRR和S2-RR在pH值8.5 (1.76 kg/m3·d) 和4.47 kg/m3·d) 达到峰值,在pH值更高时显著下降.
- 在pH值升高的情况下,NO2-N和S0的积累效率分别达到96%和91%.
- 微生物群落从硫胺 (pH 7.5-8.5) 转移到菌 (pH 9-10) 随着pH的增加.
结论:
- 对DSSADN的最佳pH值约为8.5以有效地去除酸盐和硫化物.
- 较高的pH值促进NO2-N和S0的积累,但降低了整体去除率.
- 在DSSADN.中,pH显著影响微生物群落结构和功能基因表达.
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