Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization: A pilot-scale study

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-04-24 DOI:10.1016/j.jes.2024.04.020
Xin Hu , Hong Yang , Xiaoyue Fang , Xuyan Liu , Jiawei Wang , Xiaotong Wang , Yongsheng Bai , Bojun Su
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Abstract

As an energy and carbon saving process for nitrogen removal from wastewater, the partial nitrification and denitrification process (PN/D) has been extensively researched. However, achieving stable PN in municipal wastewater has always been challenging. In this study, a gel immobilized PN/D nitrogen removal process (GI-PN/D) was established. A 94d pilot-scale experiment was conducted using real municipal wastewater with an ammonia concentration of 43.5 ± 5.3 mg N/L at a temperature range of 11.3–28.7℃. The nitrogen removal performance and associated pathways, shifts in the microbial community as well as sludge yield were investigated. The results were as follows: the effluent TN and COD were 0.6 ± 0.4 mg/L and 31.1 ± 3.8 mg/L respectively, and the NAR exceeding 95 %. GI-PN/D achieved deep nitrogen removal of municipal wastewater through stable PN without taking any other measures. The primary pathways for nitrogen removal were identified as denitrification, simultaneous nitrification-denitrification, and aerobic denitrification. High-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor, effectively promoting the dominance and stability of the microbial communities. In addition, GI-PN/D had the characteristic of low sludge yield, with an average sludge yield of 0.029 kg SS/kg COD. This study provides an effective technical for nitrogen removal from municipal wastewater through PN.

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通过凝胶固定化技术实现了稳定的部分硝化,从而去除城市污水中的氮:中试规模研究
作为一种节能节碳的废水脱氮工艺,部分硝化和反硝化工艺(PN/D)已得到广泛研究。然而,在城市污水中实现稳定的硝化脱氮一直是个挑战。本研究建立了一种凝胶固定化 PN/D 脱氮工艺(GI-PN/D)。在 11.3-28.7℃ 的温度范围内,使用氨氮浓度为 43.5 ± 5.3 mg N/L 的实际城市污水进行了 94d 的中试规模实验。研究了脱氮性能和相关途径、微生物群落的变化以及污泥产量。结果如下:出水 TN 和 COD 分别为 0.6 ± 0.4 mg/L 和 31.1 ± 3.8 mg/L,NAR 超过 95%。GI-PN/D 在不采取任何其他措施的情况下,通过稳定的 PN 实现了城市污水的深度脱氮。脱氮的主要途径被确定为反硝化、同时硝化-反硝化和好氧反硝化。高通量测序分析表明,固定化填料促进了每个反应器中功能细菌的自主富集,有效提高了微生物群落的优势和稳定性。此外,GI-PN/D 还具有污泥产量低的特点,平均污泥产量为 0.029 kg SS/kg COD。这项研究为通过 PN 从城市污水中脱氮提供了一种有效的技术。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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