基于藻类的污水处理系统中磷回收的技术经济优化。
Techno-economic optimization of phosphorous recovery in an algal-based sewage treatment system.
机构信息
Civil Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA.
Civil Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA.
出版信息
Bioresour Technol. 2021 Jul;332:125128. doi: 10.1016/j.biortech.2021.125128. Epub 2021 Apr 7.
Previous reports have documented the technical viability of an algal pathway for treating primary effluent and recovering its phosphorus-content (P) via hydrothermal liquefaction (HTL) of the resulting biomass. In this pathway, leaching P from HTL-derived biochar was found as the critical step impacting the economics of P-recovery. As such, a process model was developed in the current study to optimize P leaching from biochar as a function of five parameters. Model predictions under various conditions agreed well with measured data (r = 0.93; n = 184). The validated process model was then integrated with a cost model to establish the following conditions as optimal for leaching P from biochar: batch leaching time of 72 h; eluent NaOH concentration of 0.5 M; eluent-to-biochar ratio of 20; temperature of 60 °C; and provision of mixing. Under these conditions, 73.5% of P from biochar could be recovered at $5.98/kg P.
先前的报告已经证明了通过水热液化（HTL）处理原废水并回收其磷含量（P）的藻类途径在技术上是可行的。在这种途径中，从 HTL 衍生的生物炭中浸出 P 被发现是影响磷回收经济性的关键步骤。因此，本研究中开发了一个过程模型，以优化生物炭中 P 的浸出作为五个参数的函数。在各种条件下，模型预测与实测数据吻合良好（r = 0.93；n = 184）。经过验证的过程模型随后与成本模型集成，以确定从生物炭中浸出 P 的最佳条件为：间歇浸出时间为 72 小时；洗脱液 NaOH 浓度为 0.5 M；洗脱液与生物炭的比例为 20；温度为 60°C；并提供搅拌。在这些条件下，生物炭中 73.5%的 P 可以以 5.98 美元/千克 P 的价格回收。
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