Pressure-driven membrane nutrient preconcentration for down-stream electrochemical struvite recovery
Pressure-driven membrane nutrient preconcentration for down-stream electrochemical struvite recovery
复制标题
用于下游电化学鸟粪石回收的压力驱动膜营养物预浓缩
DOI：
10.1016/j.seppur.2022.122907
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发表时间：
2023
影响因子：
8.6
通讯作者：
Greenlee, Lauren
中科院分区：
文献类型：
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作者：
Anari, Zahra;Morrissey, Karla;Kékedy-Nagy, László;Daneshpour, Raheleh;Abolhassani, Mojtaba;Moore, John;Thoma, Greg;Greenlee, Lauren
从废水中回收营养物质是一种可持续的解决方案，可以防止有害的营养物质释放到环境中。在这里，我们研究了废水中的养分回收，在下游电化学养分沉淀之前，使用压力驱动膜对废水养分进行预浓缩。电化学鸟粪石沉淀时，营养物浓度越高，沉淀效率越高。因此，我们研究了不同聚合物化学和分子量截断（MWCO）的商用纳滤（NF）和反渗透（RO）膜的性能，并根据设计目标和废水成分讨论了膜的选择，以实现最大的营养回收效率。结果表明，300 Da MWCO的聚酰胺薄膜复合（PA-TFC）纳滤膜（Alfa）具有较高的通量和去除效率，在所有膜中具有最高的磷(P)预富集浓度因子。BW30LE （PA-TFC, 100 Da）、Synder （PA-TFC, 100 - 250 Da）和NF90 （PA-TFC, 200-400 Da）具有较高的氮回收率。NF90和Synder滤膜能够在更低的能耗下实现与BW30LE反渗透膜相似的氮浓度因子。建议采用所选膜进行多级膜系统设计，使营养物有效回收。采用生命周期评价（LCA）对多级膜营养物回收系统的环境影响进行了表征。在所选膜的不同工艺配置中，主要趋势包括：1)随着膜数量的增加，大多数类别的环境影响增加；2)随着在给定配置中可以生产的肥料替代品数量的增加，总环境影响减少，但有一些例外。
Nutrient recovery from wastewater is a sustainable solution to combat the harmful release of nutrients to the environment. Here, we investigate nutrient recovery from wastewater by pre-concentration of wastewater nutrients using pressure-driven membranes prior to downstream electrochemical nutrient precipitation. When using electrochemical struvite precipitation, a higher nutrient concentration leads to a higher precipitation efficiency. Therefore, we investigate the performance of commercial nanofiltration (NF) and reverse osmosis (RO) membranes with different polymer chemistry and molecular weight cut-offs (MWCO) and discuss the membrane selection based on design goals and wastewater compositions for maximum nutrient recovery efficiency. Our results indicated that the Alfa membrane, a polyamide thin film composite (PA-TFC) NF membrane with 300 Da MWCO has the highest concentration factor in phosphorus (P) preconcentration among all the membranes studied due to the high flux and removal efficiency. BW30LE (PA-TFC, 100 Da), Synder (PA-TFC, 100–250 Da) and NF90 (PA-TFC, 200–400 Da) achieved a high concentration factor for nitrogen (N) recovery. NF90 and Synder NF membranes are able to achieve a nitrogen concentration factor similar to BW30LE RO membrane at much lower energy consumption. A multistage membrane system design is suggested using the selected membranes for effective nutrient recovery. Life cycle assessment (LCA) was conducted to characterize the environmental impact of the multistage membrane nutrient recovery system. Among the different process configurations of the selected membranes, key trends included: 1) environmental impacts across most categories increased as the number of membranes increased, and 2) as the amount of fertilizer substitute that could be produced in a given configuration increased, total environmental impacts decreased with some exceptions.