Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210095, China.
Bioresour Technol. 2024 May;399:130602. doi: 10.1016/j.biortech.2024.130602. Epub 2024 Mar 16.
Lactic acid-rich fermentation liquid (LAFL) of food waste is found to act as a promising alternative carbon source for nitrogen removal in wastewater treatment. Here, LAFL was employed to investigate its impacts on nitrogen removal during raw municipal wastewater treatment with a comparison to sodium acetate (NaAc). Results indicated that nitrogen removals were comparable when incorporated with LAFL and NaAc (92.89 % v.s. 91.23 %). Unlike the utilization of NaAc, using LAFL could avoid suppressing the relative abundance of the nitrification genes and thus pose a negative risk to nitrogen removal during prolonged operation. The introduction of LAFL increased the stability and robustness of the functional microbial community and effectively reduced excess activated sludge (AS) generation by 109 % compared to NaAc addition, consequently enhancing nitrogen removal but diminishing the treatment cost. In general, LAFL exhibits prospective engineering application potentials and economic advantages in improving nitrogen removal by AS process.
富含乳酸的食物废物发酵液（LAFL）被发现可以作为废水处理中去除氮的有前途的替代碳源。在这里，与使用乙酸钠（NaAc）进行比较，采用 LAFL 来研究其对原城市污水中氮去除的影响。结果表明，当与 LAFL 和 NaAc 一起使用时，氮的去除率相当（92.89%比 91.23%）。与使用 NaAc 不同，使用 LAFL 可以避免抑制硝化基因的相对丰度，从而在长时间运行过程中不会对氮去除产生负面影响。LAFL 的引入增加了功能微生物群落的稳定性和鲁棒性，与添加 NaAc 相比，有效减少了 109%的过量活性污泥（AS）生成，从而提高了氮去除率，但降低了处理成本。总的来说，LAFL 在通过 AS 工艺提高氮去除方面具有潜在的工程应用潜力和经济优势。
