Beijing International Scientific and Technological Cooperation Base of Water Pollution Control Techniques for Antibiotics and Resistance Genes, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China.
Beijing International Scientific and Technological Cooperation Base of Water Pollution Control Techniques for Antibiotics and Resistance Genes, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China.
Sci Total Environ. 2021 Oct 20;792:148263. doi: 10.1016/j.scitotenv.2021.148263. Epub 2021 Jun 4.
A step-feed anoxic/oxic/anoxic/oxic (SF-A/O/A/O) was developed and successfully applied to full-scale coking wastewater treatment. The performance and microbial community were evaluated and systematically compared with the anoxic/oxic/oxic (A/O/O) process. SF-A/OA/O process exhibited efficient removal of COD, NH-N, TN, phenols, and cyanide with corresponding average effluent concentrations of 317.9, 1.8, 46.2, 1.1, and 0.2 mg·L, respectively. In particular, the TN removal efficiency of A/O/O process was only 7.8%, with an effluent concentration of 300.6 mg·L. Furthermore, polycyclic aromatic hydrocarbons with high molecular weight were the dominant compounds in raw coking wastewater, which were degraded to a greater extent in SF-A/OA/O. The abundance in Thiobacillus, SM1A02, and Thauera could be the main reason why SF-A/O/A/O was superior to A/O/O in treating TN. The microbial community structure of SF-A/O/A/O was similar among stages in system (P ≥ 0.05, Welch's t-test) and was less affected by environmental factors, which may have been one of the important factors in the system's strong stability.
序批式缺氧/好氧/缺氧/好氧（SF-A/O/A/O）工艺被开发并成功应用于焦化废水的实际处理中。对其性能和微生物群落进行了评估，并与缺氧/好氧/缺氧/好氧（A/O/A/O）工艺进行了系统比较。SF-A/OA/O 工艺对 COD、NH4-N、TN、酚和氰化物的去除效果显著，相应的平均出水浓度分别为 317.9、1.8、46.2、1.1 和 0.2mg·L-1。特别是 A/O/A/O 工艺的 TN 去除率仅为 7.8%，出水中 TN 的浓度为 300.6mg·L-1。此外，高相对分子质量的多环芳烃是焦化废水原水中的主要化合物，在 SF-A/OA/O 中得到了更大程度的降解。在处理 TN 方面，SF-A/OA/O 优于 A/O/A/O 的主要原因可能是 Thiobacillus、SM1A02 和 Thauera 的丰度较高。SF-A/OA/O 系统各阶段的微生物群落结构在系统内相似（P≥0.05，Welch 检验），受环境因素的影响较小，这可能是系统稳定性强的重要因素之一。
