期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 56, 期 2, 页码 1310-1320出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c06049
关键词
simultaneous treatment; mature landfill leachate; waste activated sludge; free nitrous acid; fermentation; Anammox
资金
- R&D Program of Beijing Municipal Education commission
- 111 Project [D16003]
- China Postdoctoral Science Foundation [2020TQ0301, 2021M690146]
- National Natural Science Foundation of China [52122005, 51978007]
The PNFA system achieved efficient nitrogen removal in treating landfill leachate and waste activated sludge, reducing the need for external carbon sources and energy consumption while also decreasing CO2 emissions.
An innovative partial nitrification, in situ fermentation, and Anammox (PNFA) system was developed to achieve mature landfill leachate and waste activated sludge simultaneous treatment. Three separate sequencing batch reactors (SBRs) were used for partial nitrification (PN-SBR), integrated fermentation-denitrification (IFD-SBR), and partial nitrification-Anammox (PNA-SBR). After 200 days of continuous operation, a satisfactory nitrogen removal efficiency (NRE) of 99.2 +/- 0.1% was obtained, with an effluent total nitrogen (TN) of 15.2 +/- 3.2 mg/L. In IFD-SBR, the volatile fatty acids generated from fermentation drove efficient denitrification, obtaining sludge and nitrogen reduction rates of 4.2 +/- 0.7 and 0.61 +/- 0.04 kg/m(3).day, respectively. Furthermore, unwanted fermentation metabolites (134.1 mg/L NH4+-N) were further treated by PNA-SBR using a combination of step-feed and intermittent aeration strategies. In PNA-SBR, Anammox significantly contributed to 82.1% nitrogen removal, and Anammox bacteria (Candidatus Brocadia, 2.3%) mutually benefited with partially denitrifying microorganisms (Thauera, 4.2%), with 66.3% of generated nitrate reduced to nitrite and then reutilized in situ by Anammox. Compared with the conventional nitrification-denitrification process, PNFA reduced oxygen energy consumption, external carbon source dosage, and CO2 emission by 21.3, 100, and 38.9%, respectively, and obtained 50.1% external WAS reduction efficiency.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据