Advanced Water Management Centre, The University of Queensland, Gehrmann Building, Brisbane, Queensland, 4072, Australia.
Advanced Water Management Centre, The University of Queensland, Gehrmann Building, Brisbane, Queensland, 4072, Australia.
Water Res. 2020 Aug 15;181:115909. doi: 10.1016/j.watres.2020.115909. Epub 2020 May 18.
Single cell protein (SCP), has been proposed as alternative to effectively upgrade and recycle organics and nutrients from wastewater. Biomass recovery is a critical issue, and recovery as a biofilm is effective in comparison with sedimentation of suspended biomass. This study aims to determine the applicability of purple phototrophic bacteria (PPB) biofilm on infra-red irradiated, submerged surfaces for the treatment of pre-settled red meat processing wastewater, and SCP generation. PPB removed up to 66% of COD and 42% of TN and TP during batch operation with total areal productivities between 15 and 20 gVS m d achieved. More than 60% of the total biomass grew attached (as biofilm) with the remainder being suspended. The biofilm can be harvested at around 160 gTS L with high protein (>96 g L) and low ash contents (>4.0% compared to >30% in the wastewater). The compositions of attached and suspended biomass differed significantly, where the suspended fraction resembled the wastewater composition (e.g. in terms of inert components). The PPB community was similar in the suspended and biofilm fractions while the biofilm had higher relative abundance of PPB representatives (57% vs 43%). A consistent product composition is highly relevant for the manufacturer and ultimately determines the value as feed, feed additive, or supplement.
单细胞蛋白（SCP）被提议作为有效升级和回收废水中有机物和营养物的替代物。生物质回收是一个关键问题，与悬浮生物质的沉淀相比，生物膜回收更有效。本研究旨在确定紫光合细菌（PPB）生物膜在红外辐照下的水下表面对预处理的红肉加工废水和 SCP 生成的适用性。PPB 在分批运行中去除了高达 66%的 COD 和 42%的 TN 和 TP，总表面积生产率在 15 到 20 gVS m d 之间。超过 60%的总生物质附着生长（作为生物膜），其余部分为悬浮状态。生物膜可以以约 160 gTS L 的产量收获，具有高蛋白（>96 g L）和低灰分含量（与废水中的>30%相比，>4.0%）。附着和悬浮生物质的组成有显著差异，悬浮部分类似于废水的组成（例如，在惰性成分方面）。悬浮和生物膜部分的 PPB 群落相似，而生物膜中 PPB 代表的相对丰度更高（57%比 43%）。一致的产品组成对制造商非常重要，最终决定了作为饲料、饲料添加剂或补充剂的价值。
