Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India.
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India.
Bioresour Technol. 2022 Nov;363:127892. doi: 10.1016/j.biortech.2022.127892. Epub 2022 Sep 5.
An anoxic-aerobic-anoxic process was established to achieve simultaneous removal of organic carbon and nitrogen from wastewater in a sequencing batch reactor. The optimum conditions were attained at a DO of 1.5 mg/L with 1 h pre-anoxic and post-anoxic periods. TOC, NH-N, and TN removal efficiencies were 98.76 ± 0.95 %, 98.52 ± 0.48 %, and 88.23 ± 0.62 %, respectively, at optimum conditions. Breakpoints in the pH, DO, and ORP curves provided a clear understanding of biochemical reactions happening in the reactor. Inhibition studies showed that 27.69 % of NH-N was removed through nitrogen removal pathways such as heterotrophic nitrification or direct conversion, and 20.55 % of TN was removed through aerobic denitrification. Microbial community analysis confirmed the presence of heterotrophic nitrifiers and aerobic denitrifiers. This study highlighted that the varied redox conditions offered by limited aeration would be beneficial for nitrogen removal, thereby reducing the energy usage and operating costs.
采用序批式反应器（SBR）建立了一种缺氧-好氧-缺氧工艺，以实现废水中有机碳和氮的同时去除。在 DO 为 1.5mg/L，预缺氧和后缺氧时间分别为 1h 的最佳条件下，TOC、NH-N 和 TN 的去除效率分别达到 98.76±0.95%、98.52±0.48%和 88.23±0.62%。pH、DO 和 ORP 曲线的转折点提供了对反应器中生化反应的清晰理解。抑制研究表明，27.69%的 NH-N 通过异养硝化或直接转化等脱氮途径去除，20.55%的 TN 通过好氧反硝化去除。微生物群落分析证实了异养硝化菌和好氧反硝化菌的存在。本研究强调，有限曝气提供的不同氧化还原条件有利于脱氮，从而降低能源消耗和运行成本。
