Devasya Roopa, Bassi Amarjeet
a Department of Chemical and Biochemical Engineering , Western University , London , Ontario , Canada.
Environ Technol. 2019 Feb;40(5):553-563. doi: 10.1080/09593330.2017.1397768. Epub 2017 Nov 15.
Phyco-remediation is an environmental-friendly method, which involves the application of beneficial microalgae to treat wastewater-containing pollutants for a diverse range of conditions. Several industrial processes generate hyper saline wastewater, which is a significant challenge for conventional wastewater treatment, and the disposal of saline waters also has a negative impact on the environment. Road salt run-off is one such saline wastewater stream not currently treated and one that contributes significantly to negatively impacting receiving bodies of water. In this study, Nannochloropsis microalgae were able to assimilate >95% of the nitrates within 8 days in road salt concentrations ranging from 2.6% to 4.4% under phototrophic cultivation mode. Biomass yields of 1-2 g/l of culture were obtained with the maximum lipid of 22% (g/g) biomass in the road salt media. The crude road salt media provided all the essential micronutrients needed for algal cultivation. The fatty acid composition analysis of the obtained lipid composed of C16 and C18 over 45% of FAME are suitable for biofuel. This study has established that the use of road salt containing nitrate and phosphate nutrients will support the growth of marine micro algae for remediation of a waste water system that are the concern at winter-prevalent regions.
藻类修复是一种环境友好型方法，它涉及应用有益微藻在多种条件下处理含有污染物的废水。一些工业过程会产生高盐废水，这对传统废水处理来说是一项重大挑战，而且盐水的排放也会对环境产生负面影响。道路融雪剂径流就是一种目前未得到处理的含盐废水流，它对受纳水体有显著的负面影响。在本研究中，在光养培养模式下，盐生微拟球藻能够在8天内同化道路融雪剂浓度为2.6%至4.4%的废水中超过95%的硝酸盐。在道路融雪剂培养基中，培养物的生物量产量达到1 - 2 g/l，生物量中脂质含量最高可达22%（g/g）。粗制的道路融雪剂培养基提供了藻类培养所需的所有必需微量营养素。所获得脂质的脂肪酸组成分析表明，超过45%的脂肪酸甲酯由C16和C18组成，适合用作生物燃料。本研究证实，利用含有硝酸盐和磷酸盐养分的道路融雪剂将有助于海洋微藻的生长，从而对冬季盛行地区令人担忧的废水系统进行修复。
