Lin Tzu-Chuan, Yang You-Ren, Nguyen Quoc Khanh, Chiu Ming-Chi, Yen Hui-Min, Chen Kao-Hsiao, Chuang Shun-Hsing
Graduate Institute of Environmental Engineering, National Central University, Taoyuan, 32001, Taiwan.
National Land Management Agency, Ministry of the Interior, Taipei City, 105404, Taiwan.
J Environ Manage. 2025 Apr;378:124805. doi: 10.1016/j.jenvman.2025.124805. Epub 2025 Mar 4.
The capacity of particulate organic matter to act as a carbon source for denitrification is a significant concern in wastewater treatment facilities. The biodegradability of particulate matter is essential to its applicability. This research aims to ascertain the role of particulate organic matter in denitrification by classifying COD, conducting pre and post denitrification tests, and analyzing the oxygen utilization rate (OUR) profile of respiration. A pilot plant was established and operated utilizing an Oxic-Anoxic-Oxic (OAO) system throughout four different loading stages, with unsettled raw wastewater as the influent. Following prolonged operation, the best removal efficiencies of OAO process for TCOD, BOD, TN, and NH-N were 87.7 ± 5.3%, 90.1 ± 7.2%, 61.5 ± 7.3%, and 99.5 ± 0.2%, respectively. The COD classification of raw wastewater showed that readily biodegradable COD (RBCOD) makes up about 12.6% ± 3.8% of total COD (TCOD), while slowly biodegradable COD (SBCOD) makes up 45.6 ± 11.2% of TCOD. This could contribute to the explanation of the system's denitrification effectiveness. The post-specific denitrification rate was in the range of 0.32-0.70 mg NO-N/gMLVSS.hr, which was higher than the endogenous denitrification. Furthermore, the observed re-increase in OUR tests explained the hydrolysis phenomena of SBCOD and demonstrated the viability of using adsorbed SBCOD as a carbon source for denitrification in the OAO process.
颗粒有机物作为反硝化碳源的能力是污水处理设施中一个重要的关注点。颗粒物质的生物降解性对其适用性至关重要。本研究旨在通过对化学需氧量（COD）进行分类、开展反硝化前后测试以及分析呼吸作用的氧利用率（OUR）曲线，来确定颗粒有机物在反硝化中的作用。建立了一个中试装置，并在四个不同负荷阶段利用好氧-缺氧-好氧（OAO）系统运行，以未沉降的原废水作为进水。经过长时间运行，OAO工艺对总化学需氧量（TCOD）、生化需氧量（BOD）、总氮（TN）和氨氮（NH-N）的最佳去除效率分别为87.7±5.3%、90.1±7.2%、61.5±7.3%和99.5±0.2%。原废水的COD分类表明，易生物降解的COD（RBCOD）约占总COD（TCOD）的12.6%±3.8%，而难生物降解的COD（SBCOD）占TCOD的45.6±11.2%。这有助于解释该系统的反硝化效果。特定反硝化速率在0.32 - 0.70毫克NO-N/克MLVSS·小时范围内，高于内源性反硝化。此外，在OUR测试中观察到的值再次升高解释了SBCOD的水解现象，并证明了在OAO工艺中使用吸附的SBCOD作为反硝化碳源的可行性。
