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Evaluation of Galdieria sulphuraria for nitrogen removal and biomass production from raw landfill leachate
Algal Research ( IF 4.6 ) Pub Date : 2021-01-16 , DOI: 10.1016/j.algal.2021.102183
Shanglei Pan , Kyleigh L. Dixon , Tabish Nawaz , Ashiqur Rahman , Thinesh Selvaratnam

This study evaluates the potential of thermophilic mixotrophic alga, Galdieria sulphuraria, to efficiently perform on-site treatment of landfill leachate (LL). Nutrient removal and algae growth experiments using various dilutions (20%, 40%, 60%, 80%, 100%) of actual municipal LL were carried out in a 14-day lab scale set-up. The effect of N/P mass ratio (255:1; 100:1; 50:1; 25:1; 10:1; 4.55:1) was also tested. Based on the results, it was evident that the growth reactors with 20% LL outperformed the other growth reactors. The final algal biomass density in 20% LL was 2.16 ± 0.22 g L−1 (twice more than compare to standard media) and the observed growth rate was 159 mg L−1d−1. Fourteen-day removal efficiencies were 99.9% for ammoniacal-nitrogen and 34% for phosphate, with removal rate of 22.78 mg L−1d−1 and 2.91 mg L−1d−1, respectively. Addition of P increased NH4-N removal rate from 16.3 to 23.6 mg L−1 day−1 when N/P mass ratio was changed from 255:1 to 4.55:1. Furthermore, range of N/P mass ratio from 100:1 to 25: 1 has been found to achieve almost 100% removal of both NH4-N and PO4-P from 20% LL in 14 days. Overall, this study showed a promising algal-based treatment system for LL nutrient removal and producing algal-biomass for subsequent value-added product generation.



中文翻译:

评价Galdieria sulfuraria去除垃圾填埋场渗滤液中的氮和生产生物质

这项研究评估了嗜热混合营养藻类(Galdieria sulphuraria)在垃圾渗滤液(LL)的有效处理方面的潜力。在14天的实验室规模设置中,使用各种稀释液(20%,40%,60%,80%,100%)的实际市政LL进行了营养去除和藻类生长实验。还测试了N / P质量比(255:1; 100:1; 50:1; 25:1; 10:1; 4.55:1)的影响。根据结果​​,很明显LL为20%的生长反应器的性能优于其他生长反应器。20%LL中的最终藻类生物量密度为2.16±0.22 g L -1(比标准培养基高两倍),观察到的生长速率为159 mg L -1 d -1。氨氮的十四天去除效率为99.9%,磷酸盐为34%,去除率分别为22.78 mg L -1 d -1和2.91 mg L -1 d -1。当N / P质量比从255:1变为4.55:1时,P的添加将NH 4 -N的去除率从16.3增加到23.6 mg L -1  day -1。此外,已经发现N / P质量比在100∶1至25∶1的范围内,在14天内从20%的LL中几乎100%地除去了NH 4 -N和PO 4 -P。总体而言,这项研究显示了一种有前途的基于藻类的处理系统,可去除LL营养素并产生藻类生物质,用于后续增值产品的生产。

更新日期:2021-01-18
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