Water and Wastewater Company, El-Fayoum Governorate, Fayuom, Egypt.
Environmental Microbiology Lab., Water Pollution Research Department, National Research Centre, Dokki, Giza, 12622, Egypt.
Environ Monit Assess. 2020 Feb 4;192(3):161. doi: 10.1007/s10661-020-8105-9.
This study was aimed to biologically treat domestic wastewater using identified bacterial consortium for chemical pollutants removal by treating/passing it through sand biofilters. The identification, toxicity test, and the optimum dose of the investigated bacterial consortium were carried out using Microtox analyzer and Batch biological treatment, respectively. Furthermore, application of sedimentation followed by gravel and sand biofilters for wastewater treatment was evaluated. The results showed that the bacterial consortium is composed of Pediococcus acidilactici, Pediococcus pentosaceus, Lactobacillus plantarum, and Bacillus subtilis. The optimum dose for wastewater treatment within 6 h of contact time is 2.5 mg/L, this dose (2.5 mg/L) has no toxic effect. The removal percentage of chemical oxygen demand (COD), biological oxygen demand (BOD), total solids (TS), total dissolved solids (TDS), total suspended solids (TSS), ammonia, nitrate, total Kjeldahl nitrogen (TKN), and oil and grease reached 93.4, 83.5, 37.5, 49.2, 93.4, 100, 55.7, 76.6, and 76% in the effluent of the treated wastewater, respectively after the third sand biofilter filtration. It can be concluded that using bacterial consortium for domestic wastewater treatment could be a good tool for chemical pollutants removal. Moreover, this study provides low cost and eco-friendly tool for domestic wastewater treatment using simple multistage biofilters based on an identified bacterial consortium. This system can be upscaled for the treatment of larger volumes of wastewater.
本研究旨在利用已鉴定的细菌混合菌来处理生活污水，通过砂生物滤池来去除化学污染物。使用 Microtox 分析仪进行鉴定、毒性测试，使用批量生物处理法进行最佳剂量的测试。此外，还评估了沉淀后砾石和砂生物滤池在废水处理中的应用。结果表明，该细菌混合菌由乳酸片球菌、戊糖片球菌、植物乳杆菌和枯草芽孢杆菌组成。接触时间为 6 小时时，处理废水的最佳剂量为 2.5mg/L，该剂量（2.5mg/L）无毒性作用。经过第三级砂生物滤池过滤后，废水中的化学需氧量（COD）、生物需氧量（BOD）、总固体（TS）、总溶解固体（TDS）、总悬浮固体（TSS）、氨、硝酸盐、总凯氏氮（TKN）和油和油脂的去除率分别达到 93.4%、83.5%、37.5%、49.2%、93.4%、100%、55.7%、76.6%和 76%。因此，使用细菌混合菌处理生活污水可以成为去除化学污染物的有效工具。此外，本研究提供了一种基于已鉴定细菌混合菌的低成本、环保型工具，用于使用简单的多级生物滤池处理生活污水。该系统可以扩大规模，用于处理更大体积的废水。
