Soil degradation, overuse of chemical fertilizer, and biodiversity loss are serious problems challenging the sustainable development of modern agriculture. In recent years, owing to the advantages of algae biotechnology in nutrients recovery and soil improvement, the integration of algae‐based wastewater remediation and algal bio‐fertilizer production is emerging into the limelight. In this work, we emphasize on the progresses achieved in the fields of biomass production by algae cultivation in wastewater and application of algal bio‐fertilizers. Particularly, three types of algal bio‐fertilizers, including slow‐release bio‐fertilizer, nitrogen‐fixing cyanobacteria, and liquid bio‐fertilizer, widely evaluated and utilized in agriculture are introduced. To prevent the overly optimistic prediction of algal bio‐fertilizer in a real‐world application, we point out the challenges and technical defects, such as presence of new pollution factors in wastewater, high cost of algal biomass, contamination of algal biomass in wastewater, low productivity of algae and valuable components, high water consumption, and potential threats of cyanobacteria to the environment, that prevent the concept of integrating algae‐based wastewater remediation and algal bio‐fertilizer production from becoming a reality. Based on our knowledge and experience, potential solutions to the aforementioned problems are discussed in depth. It is expected that the emerging technologies of algae‐based wastewater remediation for bio‐fertilizer production will bring human beings into a new era of environmentally‐friendly, high‐yield, and resource‐recycling agriculture. © 2020 Society of Chemical Industry (SCI)

中文翻译：

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用于生物肥料生产的基于藻类废水修复的新兴技术：通往可持续农业的有希望的途径

土壤退化，化学肥料的过度使用以及生物多样性的丧失是严重挑战现代农业可持续发展的问题。近年来，由于藻类生物技术在养分回收和土壤改良方面的优势，基于藻类的废水修复和藻类生物肥料生产的整合正成为人们关注的焦点。在这项工作中，我们强调在废水中进行藻类培养和藻类生物肥料的应用在生物质生产领域所取得的进展。特别地，介绍了在农业中广泛评估和使用的三种类型的藻类生物肥料，包括缓释生物肥料，固氮蓝细菌和液体生物肥料。为了防止在实际应用中过分乐观地预测藻类生物肥料，我们指出了挑战和技术缺陷，例如废水中存在新的污染因素，藻类生物质的高成本，废水中藻类生物质的污染，藻类和有价值成分的生产力低下，高耗水量以及蓝藻对水体的潜在威胁这种环境阻碍了将基于藻类的废水修复和藻类生物肥料生产相结合的概念成为现实。根据我们的知识和经验，对上述问题的潜在解决方案进行了深入讨论。可以预期，用于生物肥料生产的基于藻类废水修复的新兴技术将使人类进入环境友好，高产和资源循环农业的新时代。©2020年化学工业协会（SCI）