Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes, Dr. Mergelina, s/n, 47011 Valladolid, Spain.
Institute of Sustainable Processes, Dr. Mergelina, s/n, 47011 Valladolid, Spain; School of Forestry, Agronomic and Bioenergy Industry Engineering (EIFAB), University of Valladolid, Campus Duques de Soria, 42004, Soria, Spain.
Chemosphere. 2020 Aug;253:126621. doi: 10.1016/j.chemosphere.2020.126621. Epub 2020 Mar 29.
The increase in natural water bodies pollution caused by intensive animal farming requires the development of innovative sustainable treatment processes. This study assessed the influence of piggery wastewater (PWW) load, air dosing, CO/NaHCO supplementation and pH control on PWW treatment by mixed cultures of purple phototrophic bacteria (PPB) under infrared radiation in batch photobioreactors. PPB was not able to grow in raw PWW but PWW dilution prevented inhibition and supported an effective light penetration. Despite the fact that PPB were tolerant to O, carbon recovery decreased in the presence of air (induced by stripping). CO supplementation was identified as an effective strategy to maximize the removal of carbon during PPB-based PWW treatment with removal efficiencies of 72% and 74% for TOC and VFAs. However, the benefits derived from CO addition were induced by the indirect pH control exerted in the cultivation medium. Thus, PPB supported an optimal pollutant removal performance at pH 7, with removal efficiencies of 75%, 39% and 98% for TOC, TN and VFAs.
集约化动物养殖导致的天然水体污染增加，需要开发创新的可持续处理工艺。本研究评估了在批式光生物反应器中，红外辐射下混合培养的紫色光合细菌（PPB）对猪场废水（PWW）处理的影响，考察了 PWW 负荷、空气曝气、CO/NaHCO3补充和 pH 控制的影响。PPB 无法在原 PWW 中生长，但 PWW 稀释可防止抑制作用，并支持有效的光穿透。尽管 PPB 对 O2具有耐受性，但曝气（通过吹脱引起）会降低碳的回收。CO 补充被确定为一种有效的策略，可以在基于 PPB 的 PWW 处理中最大限度地去除碳，TOC 和 VFAs 的去除效率分别达到 72%和 74%。然而，CO 添加带来的好处是通过在培养介质中施加间接的 pH 控制来实现的。因此，PPB 在 pH 7 时支持最佳的污染物去除性能，TOC、TN 和 VFAs 的去除效率分别为 75%、39%和 98%。
