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首页> 外文期刊>Frontiers of environmental science & eng >Sea salt bittern-driven forward osmosis for nutrient recovery from black water: A dual waste-to-resource innovation via the osmotic membrane process
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Sea salt bittern-driven forward osmosis for nutrient recovery from black water: A dual waste-to-resource innovation via the osmotic membrane process

机译：海盐卤水驱动的正向渗透用于从黑水中回收营养物：通过渗透膜工艺实现废物到资源的双重创新

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摘要

A dual "waste-to-resource" innovation in nutrient enrichment and recovery from domestic black water using a sea salt bittern (SSB)-driven forward osmosis (FO) process is proposed and demonstrated.The performance of SSB as a "waste-to-resource" draw solution for FO was first evaluated.A synthetic SSB-driven FO provided a water flux of 25.67±3.36 L/m h,which was 1.5-1.7 times compared with synthetic seawater,1 M NaCl,and 1 M MgCl_2.Slightly compromised performance regarding reverse solute selectivity was observed.In compensation,the enhanced reverse diffusion of Mg~(2+) suggested superior potential in terms of recovering nutrients in the form of struvite precipitation.The nutrient enrichment was performed using both the pre-filtered influent and effluent of a domestic septic tank.Over 80% of phosphate-P recovery was achieved from both low- and high-strength black water at a feed volume reduction up to 80%-90%.With an elevated feed pH (~9),approximately 60%-85% enriched phosphate-P was able to be recovered in the form of precipitated stuvite.Whereas the enrichment performance of total Kjeldahl nitrogen (TKN) largely differed depending on the strength of black water.Improved concentration factor (i.e.,3-folds) and retention (＞60%) of TKN was obtained in the high-nutrient-strength black water at a feed volume reduction of 80%,in comparison with a weak TKN enrichment observed in low-strength black water.The results suggested a good potential for nutrient recovery based on this dual "waste-to-resource" FO system with proper management of membrane cleaning.
机译：提出并论证了利用海盐卤水（SSB）驱动的正向渗透（FO）工艺从生活用水中富集和回收黑水的双重“废物至资源”创新技术。SSB的性能表现为“废物至垃圾”。首先评估了用于FO的“资源”抽取溶液。合成的SSB驱动的FO的水通量为25.67±3.36 L / mh，是合成海水，1 M NaCl和1 M MgCl_2的1.5-1.7倍。作为补偿，Mg〜（2+）的反向扩散增强表明，在鸟粪石沉淀形式的营养物回收方面具有更高的潜力。营养物的富集使用两种预过滤的进水进行。低强度和高强度黑水中的磷磷酸盐回收率超过80％，进料量减少了80％-90％，进料pH值升高（〜9） ，大约60％-85％的富含磷酸盐的P le以沉淀的鸟粪石形式回收。总凯氏氮（TKN）的富集性能因黑水的强度而有很大差异。提高的浓缩倍数（即3倍）和保留率（＞ 60％）与低强度黑水中的TKN富集程度较弱相比，在高营养强度黑水中的TKN的添加量减少了80％，结果表明，基于这种双重“适当管理膜清洁的“废物到资源” FO系统。

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