School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Engineering Research Center of Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing 100083, China.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Bioresour Technol. 2018 Oct;266:498-506. doi: 10.1016/j.biortech.2018.06.082. Epub 2018 Jun 25.
The organic matter and surfactants in wastewater may cause variations in the surface tension of wastewater (STW) ranging between ∼40 and ∼70 mJ·m. This study focused on the influence of STW on microalgae biofilm formation. A theoretical analysis was first conducted, and then microalgae biofilm formation on hydrophilic and hydrophobic substrata in liquid and real wastewater with different surface tensions was studied. The results demonstrated that STW affected microalgae biofilm formation remarkably. When the surface tension of liquid medium (γ) was approximately equal to the average value of surface free energy of microalgae and substrata, biofilm formation reached the minimum. Microalgae biofilm formation on a hydrophilic surface first decreased (from ∼2200 to ∼1500 cells/mm) and then increased (from ∼1500 to 3100 cells/mm) with the decrease in γ (from ∼70 to ∼40 mJ·m), whereas biofilm on a hydrophobic surface continued to decrease (from ∼2500 to 1000 cells/mm).
废水中的有机物和表面活性剂可能会导致废水的表面张力（STW）发生变化，范围在 40 到 70mJ·m 之间。本研究关注 STW 对微藻生物膜形成的影响。首先进行了理论分析，然后研究了在具有不同表面张力的液体和实际废水中亲水性和疏水性基底上微藻生物膜的形成。结果表明，STW 对微藻生物膜的形成有显著影响。当液体介质的表面张力（γ）接近微藻和基底的表面自由能平均值时，生物膜的形成达到最小值。亲水性表面上的微藻生物膜形成先减少（从约 2200 到约 1500 个细胞/mm），然后增加（从约 1500 到 3100 个细胞/mm），而疏水性表面上的生物膜则继续减少（从约 2500 到 1000 个细胞/mm）。
