Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Int J Environ Res Public Health. 2023 Feb 8;20(4):2990. doi: 10.3390/ijerph20042990.
The unsatisfactory performance of the conventional swine wastewater treatment is drawing increasing attention due to the large amount of refractory chemical oxygen demand (COD), nitrogen, and phosphorus attached to the suspended solids (SS). In this study, for the first time, a novel process based on bio-coagulation dewatering followed by a bio-oxidation (BDBO) system was developed to treat swine wastewater containing high-strength SS, COD, TN, and TP. Firstly, after the bio-coagulation process, the removal efficiencies of SS, COD, NH-N, and TP reached as high as 99.94%, 98.09%, 61.19%, and 99.92%, respectively. Secondly, the filtrate of the bio-coagulation dewatering process was introduced into the subsequent bio-oxidation process, in which the residual COD and NH-N were further biodegraded in a sequence batch reactor. In addition, the dewatering performance of the concentrated swine slurry was substantially improved, with the specific resistance to filtration decreasing from 17.0 × 10 to 0.3 × 10 m/kg. Moreover, the concentrated swine slurry was pressed and filtered into a semi-dry cake after pilot-scale bio-coagulation dewatering treatment. Finally, the concentrations of COD and NH-N in the effluent after the BDBO process, ranging between 150-170 mg/L and 75-90 mg/L, met the relevant discharge standard. Compared to traditional treatments, the BDBO system has excellent large-scale potential for improving the treatment efficiency, shortening the operation period, and reducing the processing costs, and is emerging as a cost-effective alternative for the treatment of wastewater containing high concentrations of SS, COD, TN, and TP.
由于悬浮固体（SS）中附着大量难处理的化学需氧量（COD）、氮和磷，传统的猪场废水处理效果不佳，引起了越来越多的关注。在本研究中，首次开发了一种基于生物混凝脱水和生物氧化（BDBO）系统的新工艺，用于处理含有高强度 SS、COD、TN 和 TP 的猪场废水。首先，在生物混凝过程之后，SS、COD、NH-N 和 TP 的去除效率分别高达 99.94%、98.09%、61.19%和 99.92%。其次，将生物混凝脱水过程的滤液引入后续的生物氧化过程中，在序批式反应器中进一步生物降解剩余的 COD 和 NH-N。此外，浓缩猪粪浆的脱水性能得到了显著改善，比阻力从 17.0×10 降低到 0.3×10 m/kg。此外，经过中试规模的生物混凝脱水处理后，浓缩猪粪浆被压滤成半干饼。最后，BDBO 工艺处理后的出水 COD 和 NH-N 浓度分别为 150-170 mg/L 和 75-90 mg/L，达到相关排放标准。与传统处理方法相比，BDBO 系统在提高处理效率、缩短运行周期和降低处理成本方面具有出色的大规模应用潜力，是处理高浓度 SS、COD、TN 和 TP 废水的一种具有成本效益的替代方法。
