Algal Technology Program, Center for Sustainable Development, College of Arts and Sciences, Qatar University, Doha 2713, Qatar.
Algal Technology Program, Center for Sustainable Development, College of Arts and Sciences, Qatar University, Doha 2713, Qatar.
Sci Total Environ. 2021 Feb 10;755(Pt 1):142532. doi: 10.1016/j.scitotenv.2020.142532. Epub 2020 Sep 28.
This study investigated the feasibility of microalgal biomass production using waste nitrogen fertilizers (WNFs) generated by the Qatar Fertiliser Company (QAFCO). From the plant, three types of WNFs (WNF1, WNF2, and WNF3) were collected; WNF1 and WNF2 had high solubility (e.g., 1000 g/L) whereas WNF3 had low solubility (65 g/L). For a lower dosage (i.e., 100 mg N/L) of these WNFs, >98% of nitrogen was soluble in water for WNF1 and WNF2; however, 52 mg N/L was soluble for WNF3. Nitrogen content in these wastes was 44, 43, and 39% for WNF1, WNF2, and WNF3, respectively. As these WNFs were used as the sole nitrogen source to grow Tetraselmis sp., Picochlorum sp., and Synechococcus sp., Tetraselmis sp. could utilize all the three WNFs more efficiently than other two strains. The biomass yield of Tetraselmis sp. in a 100,000 L raceway pond was 0.58 g/L and 0.67 g/L for mixed WNFs (all WNF in equal ratio) and urea, respectively. The metabolite profiles of Tetraselmis sp. biomass grown using mixed WNFs were very similar to the biomass obtained from urea-added culture - suggesting that WNFs produced Tetraselmis sp. biomass could be used as animal feed ingredients. Life cycle impact assessment (LCIA) was conducted for six potential scenarios, using the data from the outdoor cultivation. The production of Tetraselmis sp. biomass in QAFCO premises using its WNFs, flue gas, and waste heat could not only eliminate the consequences of landfilling WNFs but also would improve the energy, cost, and environmental burdens of microalgal biomass production.
本研究考察了利用卡塔尔化肥公司（QAFCO）产生的废氮肥料（WNFs）生产微藻生物质的可行性。从工厂中收集了三种类型的 WNF（WNF1、WNF2 和 WNF3）；WNF1 和 WNF2 的溶解度高（例如，1000 g/L），而 WNF3 的溶解度低（65 g/L）。对于这些 WNF 的较低剂量（即 100 mg N/L），WNF1 和 WNF2 中的>98%的氮在水中可溶；然而，WNF3 中只有 52 mg N/L 可溶。这些废水中的氮含量分别为 WNF1、WNF2 和 WNF3 的 44%、43%和 39%。由于这些 WNF 被用作生长 Tetraselmis sp.、Picochlorum sp. 和 Synechococcus sp. 的唯一氮源，与其他两种菌株相比，Tetraselmis sp. 能够更有效地利用这三种 WNF。在一个 10 万升的跑道式池塘中，Tetraselmis sp. 的生物量产量分别为 0.58 g/L 和 0.67 g/L，用于混合 WNF（所有 WNF 按相等比例）和尿素。使用混合 WNF 培养的 Tetraselmis sp. 生物质的代谢物谱与添加尿素培养获得的生物质非常相似-表明 WNF 生产的 Tetraselmis sp. 生物质可作为动物饲料成分。使用室外培养的数据，对六个潜在方案进行了生命周期影响评估（LCIA）。在 QAFCO 场地使用其 WNF、烟道气和废热生产 Tetraselmis sp. 生物质，不仅可以消除 WNF 填埋的后果，还可以降低微藻生物质生产的能源、成本和环境负担。
