Institute of Hydraulic Research of the Federal University of Rio Grande do Sul., Porto Alegre, RS, Zip Code: 91501-970, Brazil.
Sci Rep. 2024 Nov 9;14(1):27393. doi: 10.1038/s41598-024-76140-3.
This study aimed to evaluate the combined treatment system of domestic sewage and leachate by serial stabilization ponds in a Wastewater Treatment Plant (WWTP). The WWTP had two parallel pond modules, one receiving (module II-pond M10) and the other not receiving leachate (module I-pond M5). Physical, chemical, and biological monitoring parameters collected from January 2017 to December 2021 were evaluated. High reducing efficiency for ammonium nitrogen was found, with an average of 95.7 ± 2.5%. BOD5 and COD can be considered statistically different for a 95% confidence level in the two pond modules. The phytoplankton community was composed of 46 taxa distributed in four taxonomic classes: 6 belonging to the Cyanobacteria group (13%), 22 to the Green Algae group (48%), 4 to the Diatoms group (9%), and 14 to the Phytoflagellate group (30%). No ecotoxicity was detected for the evaluated pond effluent samples. Thus, although the insertion of leachate impacted the quality of the final effluent of the ponds and the organic matter, it may not have affected the effluents' ecotoxicity. This research helps to understand the impacts of long-term leachate insertion in a real treatment system using stabilization ponds for combined treatment. In addition to the usual efficiency evaluation parameters, ecotoxicological tests and phytoplankton are also evaluated.
本研究旨在评估污水处理厂（WWTP）中串联稳定塘对生活污水和渗滤液的联合处理系统。该 WWTP 有两个平行的池塘模块，一个接收（模块 II-池塘 M10），另一个不接收渗滤液（模块 I-池塘 M5）。从 2017 年 1 月至 2021 年 12 月收集的物理、化学和生物监测参数进行了评估。发现铵态氮的还原效率很高，平均为 95.7±2.5%。在两个池塘模块中，BOD5 和 COD 可以在 95%置信水平下被认为具有统计学差异。浮游植物群落由 46 个分类群组成，分布在四个分类类群中：6 个属于蓝藻组（13%），22 个属于绿藻组（48%），4 个属于硅藻组（9%），14 个属于原生动物组（30%）。评估的池塘出水样本未检测到生态毒性。因此，尽管渗滤液的插入会影响池塘最终出水的质量和有机物，但它可能不会影响出水的生态毒性。这项研究有助于了解在使用稳定塘进行联合处理的实际处理系统中，长期渗滤液插入的影响。除了通常的效率评估参数外，还评估了生态毒性测试和浮游植物。
