Department of Environmental Engineering and Water Technology, IHE-Delft Institute for Water Education, P.O. Box 3015, 2601 DA Delft, the Netherlands; Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, the Netherlands; Ingeniería Ambiental, Instituto Tecnológico de Costa Rica, Cartago 159-7050, Costa Rica.
Department of Environmental Engineering and Water Technology, IHE-Delft Institute for Water Education, P.O. Box 3015, 2601 DA Delft, the Netherlands.
Sci Total Environ. 2020 Nov 1;741:140480. doi: 10.1016/j.scitotenv.2020.140480. Epub 2020 Jun 23.
The co-treatment of two synthetic faecal sludges (FS-1 and FS-2) with municipal synthetic wastewater (WW) was evaluated in an aerobic granular sludge (AGS) reactor. After characterisation, FS-1 showed the following concentrations, representative for medium-strength FS: 12,180 mg TSS L, 24,300 mg total COD L, 93.8 mg PO-P L, and 325 mg NH-N L. The NO-N concentration was relatively high (300 mg L). For FS-2, the main difference with FS-1 was a lower nitrate concentration (18 mg L). The recipes were added consecutively, together with the WW, to an AGS reactor. In the case of FS-1, the system was fed with 7.2 kg total COD md and 0.5 kg Nitrogen md. Undesired denitrification occurred during feeding and settling resulting in floating sludge and wash-out. In the case of FS-2, the system was fed with 8.0 kg total COD md and 0.3 kg Nitrogen md. The lower NO-N concentration in FS-2 resulted in less floating sludge, a more stabilised granular bed and better effluent concentrations. To enhance the hydrolysis of the slowly biodegradable particulates from the synthetic FS, an anaerobic stand-by period was added and the aeration period was increased. Overall, when compared to a control AGS reactor, a lower COD consumption (from 87 to 35 mg g VSS h), P-uptake rates (from 6.0 to 2.0 mg P g VSS h) and NH-N removal (from 2.5 to 1.4 mg NH-N g VSS h) were registered after introducing the synthetic FS. Approximately 40% of the granular bed became flocculent at the end of the study, and a reduction of the granular size accompanied by higher solids accumulation in the reactor was observed. A considerable protozoa Vorticella spp. bloom attached to the granules and the accumulated particles occurred; potentially contributing to the removal of the suspended solids which were part of the FS recipe.
将两种合成粪便污泥（FS-1 和 FS-2）与城市合成废水（WW）共同处理在好氧颗粒污泥（AGS）反应器中进行了评估。经过特征描述，FS-1 表现出以下浓度，代表中等强度 FS：12180mgTSS/L、24300mg 总 COD/L、93.8mgPO-P/L 和 325mgNH-N/L。NO-N 浓度相对较高（300mg/L）。对于 FS-2，与 FS-1 的主要区别是硝酸盐浓度较低（18mg/L）。配方连续添加到 AGS 反应器中，与 WW 一起添加。对于 FS-1，系统以 7.2kg 总 COD md 和 0.5kg 氮 md 的量进料。进料和沉降过程中发生了不希望的反硝化作用，导致浮泥和冲洗。对于 FS-2，系统以 8.0kg 总 COD md 和 0.3kg 氮 md 的量进料。FS-2 中较低的 NO-N 浓度导致浮泥较少、更稳定的颗粒床和更好的出水浓度。为了增强合成 FS 中缓慢生物降解颗粒的水解，添加了厌氧备用期并增加了曝气期。总体而言，与对照 AGS 反应器相比，COD 消耗（从 87 降至 35mg/gVSSh）、P 吸收速率（从 6.0 降至 2.0mgPgVSSh）和 NH-N 去除（从 2.5 降至 1.4mgNH-N/gVSSh）较低。研究结束时，大约 40%的颗粒床变得絮状，并且观察到颗粒尺寸减小并伴有反应器中固体积累增加。大量的纤毛类原生动物钟虫属（Vorticella spp.）在颗粒上大量繁殖，附着在颗粒上，并积累了颗粒；可能有助于去除 FS 配方中的悬浮固体。
