胞外聚合物产量、组分及除磷模型构建  

Constructing the EPS model:Involving production,composition,and phosphate removal

作　　者：郝晓地[1] 杨万邦 李季[1] 郝丽婷 HAO Xiaodi;YANG Wanbang;LI Ji;HAO Liting(Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies,Key Laboratory of Urban Stormwater System and Water Environment(Ministry of Education),Beijing University of Civil Engineering and Architecture,Beijing 10004)

机构地区：[1]北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室,中-荷污水处理技术研发中心,北京100044

出　　处：《环境科学学报》2025年第2期1-13,共13页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.52170018)。

摘　　要：针对污水生物处理过程中胞外聚合物(EPS)产量、组分及除磷性能,在TUD联合代谢模型基础上构建EPS模型(TUD-EPS).TUD模型被拓展,嵌入EPS产量、组分及除磷3个子模块,旨在全面解析EPS在污水生物中的多重角色,并使之最终产量最大化而实现潜在的高值资源化.构建模型用实验室中试规模生物营养物去除(BNR)工艺进行校正并验证,可以准确地模拟EPS产量、组分及除磷,揭示一些通过实验手段难以完成的作用机制.预测结果显示,缩短污泥龄(SRT)可以明显增加EPS产量,但对其中含磷量影响不明显;EPS对生物除磷贡献率约为11%,主要是通过吸附与转运机制促进磷去除;EPS在脱氮过程中起到吸附NH+4及临时储存作用,有助于提高处理系统的稳定性;在满足BNR系统脱氮除磷需求的前提下,获得最大EPS产量的适宜SRT应≥7d.这些模拟预测为深入理解EPS在污水生物处理中的作用及工艺优化运行提供了理论依据.Based on the TUD combined metabolic model,the EPS(extracellular polymeric substances)model(TUD-EPS)involving production,composition,and P-removal was constructed.The TUD model was expanded by embedding the three modules,aiming to elucidate the roles of EPS in biological wastewater treatment processes and to maximize EPS production to realize a highly-valued resource.The TUD-EPS model was verified and calibrated using a pilot-scale BNR(biological nutrient removal)process,which could accurately simulate EPS production,composition,and Premoval.Based on the reliable TUD-EPS model,a series of simulation predictions were conducted,revealing some interactions to be difficult achieved by experiments.The predicted results reveal that shortened SRT(sludge retention time)can enhance EPS production but has a minor impact on the Pcontent of EPS;that the EPS contribution to bio P-removal is approximately 11%,primarily through adsorption and transportation mechanisms;that EPS plays a role in adsorbing NH+4 as a temporary N-storage reservoir,enhancing the stability of the treatment system;that maximal EPS production must be associated with SRT≥7 d(the minimal SRT required for basic nutrient removal).The study provides a theoretical basis for deeply understanding the roles of EPS in biological wastewater treatment and its process optimization.

关 键 词：胞外聚合物(EPS) 产量/组分/除磷 数学模型 模型验证/校正 污泥龄(SRT) 脱氮除磷 

分 类 号：X703[环境科学与工程—环境工程]