Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
Water Res. 2022 Sep 1;223:119041. doi: 10.1016/j.watres.2022.119041. Epub 2022 Aug 30.
Treatment technologies based on microalgal biofilms have an enormous potential for dealing with water pollution because they can efficiently redirect nutrients from wastewater to renewable biomass feedstock. However, poor light transmittance is caused by the high turbidity of wastewater, which hinders the commercial application of microalgal biofilm-based wastewater treatment. Here, a bifunctional substrate with lighting and biofilm support functions was constructed using a light guide plate. In a biofilm photobioreactor (bPBR) with a bifunctional lighting/supporting substrate (BL/S substrate), light can directly irradiate the biofilm to avoid attenuation by the turbid wastewater. Direct irradiation of light onto the biofilm led to a 93.0% enhancement of microalgal photoconversion efficiency when compared to that of a supporting substrate without lighting (SO substrate). Meanwhile, the maximum growth rate of the microalgal biofilm on the BL/S substrate was 8.7 g m d, which was increased by 60.3%. The removal rate of ammonia nitrogen (NH-N) from the digested wastewater contributed by the microalgal biofilm reached 22.6 mg L d, which was higher than the previously reported that of NH-N from turbid digested wastewater by the biofilms. Furthermore, the BL/S substrate can facilitate the secretion of abundant extracellular polymeric substrates, which results in the stable adhesion of the biofilm onto the BL/S substrate. The optical density of the microalgae cells at the outlet of the bPBR with BL/S substrate was below 0.1, which was 94% lower than that of the bPBR with the SO substrate. The results indicated the BL/S substrate may avoid the loss of microalgal biomass, and almost all biomass could be easily harvested from the biofilm for algae-based biomass resources. Consequently, this study can offer a promising alternative with efficient treatment technologies for wastewater with high turbidity.
基于微藻生物膜的处理技术在处理水污染方面具有巨大的潜力，因为它们可以有效地将废水中的营养物质重新定向到可再生生物质原料中。然而，废水的高浊度导致透光率差，这阻碍了基于微藻生物膜的废水处理的商业应用。在这里，使用导光板构建了一种具有照明和生物膜支撑功能的双功能基质。在具有双功能照明/支撑基质 (BL/S 基质) 的生物膜光生物反应器 (bPBR) 中，光可以直接照射到生物膜上，避免被混浊废水衰减。与没有照明的支撑基质 (SO 基质) 相比，直接照射到生物膜上的光使微藻的光转化率提高了 93.0%。BL/S 基质上微藻生物膜的最大增长率为 8.7 g m d，增加了 60.3%。微藻生物膜对消化废水的氨氮 (NH-N) 的去除率达到 22.6 mg L d，高于先前报道的混浊消化废水中生物膜对 NH-N 的去除率。此外，BL/S 基质可以促进丰富的胞外聚合物基质的分泌，从而使生物膜稳定地附着在 BL/S 基质上。带有 BL/S 基质的 bPBR 出口处的微藻细胞的光密度低于 0.1，比带有 SO 基质的 bPBR 低 94%。结果表明，BL/S 基质可以避免微藻生物量的损失，并且几乎可以从生物膜中轻松收获所有的生物质，用于藻类生物质资源。因此，这项研究为高浊度废水提供了一种有前途的替代高效处理技术。
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