Due to high biomass retention and outstanding setting property, granular sludge has been widely applied in wastewater treatment plants to reduce the footprint, lower energy consumption and increase capacity. Granular sludge consists of microorganisms embedded in extracellular matrix which contains a variety of extracellular biomaterials. Those biomaterials are renewable, biodegradable, nontoxic and without secondary pollution, and have similar properties with industrial products. Therefore, granular sludge offers promising opportunities for recovering high value-added biomaterials, which could contribute to sustainable wastewater treatment and resource recycle. This work presents a comprehensive and up to date review on resources recovery of various extracellular biomaterials from granular sludge. And we mainly focus on the characteristics, extraction and recovery technologies as well as potential applications of these biomaterials. In addition, impacts of biomaterials extraction on subsequent sludge treatment, such as anaerobic digestion, energy recovery and sludge dewaterability are discussed. The technologies options and potential applications analysis presented in this study could contribute to the development of the recycling of extracellular biomaterials from granular sludge-based wastewater treatment process.

由于高的生物质截留率和出色的凝结性能，颗粒污泥已被广泛应用于废水处理厂，以减少占地面积，降低能耗并提高产能。颗粒污泥由嵌入细胞外基质的微生物组成，其中包含多种细胞外生物材料。这些生物材料是可再生的，可生物降解的，无毒的且没有二次污染，并且具有与工业产品相似的特性。因此，颗粒污泥为回收高附加值的生物材料提供了有希望的机会，这可能有助于可持续的废水处理和资源回收。这项工作对从颗粒污泥中回收各种细胞外生物材料的资源进行了全面而最新的综述。我们主要关注特征 提取和回收技术以及这些生物材料的潜在应用。此外，还讨论了生物材料提取对后续污泥处理的影响，如厌氧消化，能量回收和污泥脱水性。这项研究中提出的技术选择和潜在应用分析可能有助于发展基于颗粒污泥的废水处理过程中细胞外生物材料的回收利用。