GENOCOV, Departament d'Enginyeria Química, Biològica i Ambiental, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Catalan Institute for Water Research (ICRA), Emili Grahit 101, 17003 Girona, Spain; University of Girona, Girona, Spain.
Sci Total Environ. 2022 Nov 25;849:157626. doi: 10.1016/j.scitotenv.2022.157626. Epub 2022 Jul 25.
The wastewater sector paradigm is shifting from wastewater treatment to resource recovery. In addition, concerns regarding sustainability during the operation have increased. In this sense, many water utilities have become aware of the potential GHG emissions during the operation of wastewater treatment. This study assesses the nitrous oxide and methane emissions during the long-term operation of a novel wastewater resource recovery facility (WRRF) configuration: the mainstream SCEPPHAR. The long-term NO and CH emission factors calculated were in the low range of the literature, 1 % and 0.1 %, respectively, even with high nitrite accumulation in the case of NO. The dynamics and possible sources of production of these emissions are discussed. Finally, different aeration strategies were implemented to study the impact on the NO emissions in the nitrifying reactor. Results showed that operating the pilot-plant under different dissolved oxygen concentrations (between 1 and 3 g O m) did not have an effect on the NO emission factor. Intermittent aeration was the aeration strategy that most mitigated the NO emissions in the nitrifying reactor, obtaining a reduction of 40 % compared to the normal operation of the pilot plant.
废水处理领域的范式正从废水处理向资源回收转变。此外，人们对运营过程中的可持续性问题的关注也日益增加。从这个意义上说，许多水务公司已经意识到在污水处理的运营过程中存在温室气体排放的潜在问题。本研究评估了新型废水资源回收设施（WRRF）配置：主流 SCEPPHAR 的长期运行过程中的氧化亚氮和甲烷排放。计算出的长期 NO 和 CH 排放因子分别为 1%和 0.1%，处于文献低值范围，即使在 NO 情况下亚硝酸盐积累较高时也是如此。讨论了这些排放物的产生动力学和可能来源。最后，实施了不同的曝气策略来研究对硝化反应器中 NO 排放的影响。结果表明，在不同溶解氧浓度（1 至 3 g O m 之间）下操作中试工厂对 NO 排放因子没有影响。间歇曝气是最能减轻硝化反应器中 NO 排放的曝气策略，与中试工厂的正常运行相比，NO 排放量减少了 40%。
