Long-term stability of two-stage aerobic granular sludge system for combined organic matter and nitrogen removal from aerobically digested centrate wastewater

IF 7.8 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-08-19 DOI:10.1016/j.psep.2025.107743

Lu Kong , Xin Zou , Yang Liu

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Abstract

This study evaluates a two-stage moving bed biofilm reactor (MBBR)-aerobic granular sludge (AGS) system developed to treat high COD and high ammonia biosolid autothermal thermophilic aerobic digestion (ATAD) centrate. The MBBR efficiently handled high organic loading rates (OLRs) exceeding 20 kg COD/m³ /d and reduced the carbon to nitrogen (C/N) ratios from 6 to 3. Treated effluent was then processed in the AGS, where nitrogen removal was primarily accomplished via the nitritation/denitritation pathway, with removal efficiencies reaching 98.9 % for NH⁺₄-N and 91.7 % for total inorganic nitrogen (TIN). After 200 days of operation, the AGS system had an optimized hydraulic retention time (HRT) of 10 h and maintained a sludge volume index (SVI) between 40 and 80 mL/g, achieving a nitrogen treatment capacity of 1.8 kg N/m³ /d. Ammonia oxidizing bacteria (AOB) demonstrated a substantial nitrogen conversion efficiency, evidenced by nitrogen conversion rates of 0.57 ± 0.02 g N/g VSS/d and denitrification rates of 1.27 ± 0.01 g N/g VSS/d. Microbial analysis revealed the enrichment of Nitrosomonas (from 0.74 % to 6.34 %) and key denitrifying genera including Thauera, Pseudomonas, and Paracoccus, supporting the system’s high and sustained nitrogen removal performance. These findings underscore the potential of the two-stage MBBR-AGS process in treating high COD high ammonia wastewater, suggesting its viability for large-scale industrial applications.

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两级好氧颗粒污泥系统对好氧消化浓缩废水中有机物和氮的联合去除的长期稳定性

本研究评估了两级移动床生物膜反应器(MBBR)-好氧颗粒污泥（AGS）系统处理高COD和高氨生物固体自热嗜热好氧消化（ATAD）浓缩物。MBBR有效地处理了超过20 kg COD/m³ /d的高有机负载率（olr），并将碳氮比（C/N）从6降至3。处理后的出水在AGS中进行处理，其中氮的去除主要通过硝化/反硝化途径完成，NH+4-N的去除率达到98.9 %，总无机氮（TIN）的去除率达到91.7 %。运行200天后，AGS系统的水力停留时间（HRT）优化为10 h，污泥体积指数（SVI）保持在40 ~ 80 mL/g之间，氮处理能力达到1.8 kg N/m³ /d。氨氧化菌（AOB）的氮转化率为0.57 ± 0.02 g N/g VSS/d，反硝化率为1.27 ± 0.01 g N/g VSS/d。微生物分析显示，亚硝化单胞菌的富集（从0.74 %增加到6.34 %）和主要反硝化属，包括Thauera，假单胞菌和副球菌，支持该系统具有高且持续的脱氮性能。研究结果表明，两段式MBBR-AGS工艺处理高COD高氨废水具有一定的潜力，具有大规模工业应用的可行性。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.