Currently, about 20% of all the nitrogen (N) and phosphorous (P) in manufactured fertilizers end up in urban sewage and are wastefully dissipated in the sewage treatment plants. To conserve the limited natural reserves of P and the energy used in the fertilizer manufacturing process, dedicated technologies for recovering N- and P-contents of sewage are being tendered. A review of the recent developments in this area revealed a common trend of appending downstream and side-stream recovery processes to the traditional treatment train composed of aerobic oxidation and anaerobic digestion. Most of these processes aim to recover N and P from the end-products of anaerobic digestion. In a counter perspective, we hypothesize that algal processes could be stoichiometrically more efficient in removing and accumulating N and P than the traditional bacterial processes which suffer from carbon-deficiency and imbalance in the carbon:N:P ratio. Long term performance of an algal-based sewage treatment system developed on this premise has been previously demonstrated at pilot scale. Results from this pilot-scale system are reviewed to evaluate the potential for nutrient recovery by integrating algal systems with downstream biomass processing technologies. Recoveries recorded in this integrated system are presented and compared with literature data on emerging nutrient recovery processes. This algal sewage treatment and resource recovery (STaRR) system has the potential to yield ~1.7 kg of ammonium sulfate and ~2.5 kg of struvite from 100 m³ of settled sewage, both, high-value crop fertilizers. This algal pathway offers unique opportunities for greening the sewage treatment practice, capable of recovering ~31% of N and ~74% of P from settled sewage for beneficial reuse with low energy demands.

目前，人造肥料中约20％的氮（N）和磷（P）最终进入城市污水，并在污水处理厂中被浪费掉。为了保护有限的自然磷和化肥生产过程中使用的能源，正在招标回收污水中N和P含量的专用技术。对这一领域最新发展的回顾表明，将下游和侧流回收工艺附加到由好氧氧化和厌氧消化组成的传统处理工艺中的普遍趋势。这些工艺中的大多数旨在从厌氧消化的最终产物中回收N和P。从相反的角度来看，我们假设藻类过程在化学计量上比传统的细菌过程在去除和积累氮和磷方面更为有效，而传统的细菌过程缺乏碳且碳∶N∶P比值不平衡。在此前提下开发的基于藻类的污水处理系统的长期性能先前已在试验规模上得到证明。对该中试规模系统的结果进行了评估，以通过将藻类系统与下游生物质加工技术相集成来评估营养回收的潜力。介绍了该综合系统中记录的回收率，并将其与有关新兴养分回收过程的文献数据进行了比较。这种藻类污水处理和资源回收（STaRR）系统有潜力在100 m的距离内产生〜1.7 kg硫酸铵和〜2.5 kg鸟粪石。在此前提下开发的基于藻类的污水处理系统的长期性能先前已在试验规模上得到证明。对该中试规模系统的结果进行了评估，以通过将藻类系统与下游生物质加工技术相集成来评估营养回收的潜力。介绍了该综合系统中记录的回收率，并将其与有关新兴养分回收过程的文献数据进行了比较。这种藻类污水处理和资源回收（STaRR）系统有可能在100 m的距离内产生〜1.7 kg硫酸铵和〜2.5 kg鸟粪石。在此前提下开发的基于藻类的污水处理系统的长期性能先前已在试验规模上得到证明。对该中试规模系统的结果进行了评估，以通过将藻类系统与下游生物质加工技术相集成来评估营养回收的潜力。介绍了该综合系统中记录的回收率，并将其与有关新兴养分回收过程的文献数据进行了比较。这种藻类污水处理和资源回收（STaRR）系统有潜力在100 m的距离内产生〜1.7 kg硫酸铵和〜2.5 kg鸟粪石。介绍了该综合系统中记录的回收率，并将其与有关新兴养分回收过程的文献数据进行了比较。这种藻类污水处理和资源回收（STaRR）系统有潜力在100 m的距离内产生〜1.7 kg硫酸铵和〜2.5 kg鸟粪石。介绍了该综合系统中记录的回收率，并将其与有关新兴养分回收过程的文献数据进行了比较。这种藻类污水处理和资源回收（STaRR）系统有潜力在100 m的距离内产生〜1.7 kg硫酸铵和〜2.5 kg鸟粪石。³种沉降污水，既是高价值农作物肥料。这种藻类途径为绿化污水处理实践提供了独特的机会，能够从沉降的污水中回收〜31％的N和〜74％的P，从而实现低能耗的有益再利用。