University Space Research Association, Columbia, MD 21044, United States.
Bioresour Technol. 2013 Sep;144:420-8. doi: 10.1016/j.biortech.2013.06.125. Epub 2013 Jul 4.
The influence of PBR composition [clear polyurethane (PolyU) vs. clear linear low-density polyethylene (LLDPE) (top) and black opaque high-density polyethylene (bottom)] and shape (rectangular vs. tubular) on biofouling and the influence of biofouling on algae productivity were investigated. In 9-week experiments, PBR biofouling was dominated by pennate diatoms and clear plastics developed macroalgae. LLDPE exhibited lower photosynthetic-active-radiation (PAR) light transmittance than PolyU before biofouling, but higher transmittance afterwards. Both rectangular and tubular LLDPE PBRs accumulated biofouling predominantly along their wetted edges. For a tubular LLDPE PBR after 12 weeks of biofouling, the correlation between biomass, percent surface coverage, and PAR transmittance was complex, but in general biomass inversely correlated with transmittance. Wrapping segments of this biofouled LLDPE around an algae culture reduced CO2 and NH3-N utilization, indicating that external biofouling must be controlled.
研究了 PBR 组成（透明聚氨酯（PolyU）与透明线性低密度聚乙烯（LLDPE）（上）和黑色不透明高密度聚乙烯（下））和形状（矩形与管状）对生物污垢的影响，以及生物污垢对藻类生产力的影响。在 9 周的实验中，PBR 生物污垢主要由羽纹硅藻和透明塑料组成的大型藻类。在生物污垢之前，LLDPE 的光合有效辐射（PAR）光透过率低于 PolyU，但之后透过率更高。矩形和管状 LLDPE PBR 都主要沿着其湿边积累生物污垢。对于生物污垢 12 周后的管状 LLDPE PBR，生物量、表面覆盖率和 PAR 透过率之间的相关性很复杂，但总体上生物量与透过率呈反比。用这段生物污垢 LLDPE 包裹藻类培养物的部分，降低了 CO2 和 NH3-N 的利用率，表明必须控制外部生物污垢。
