Enhancing volatile fatty acids production from waste activated sludge: The role of pretreatment by N,N-bis(carboxymethyl)-L-glutamate (GLDA)

作     者：Chang Liu Lin Li Linji Xu Tanglong Zhang Qiang He Xiaodong Xin 

作者机构：Key Laboratory of the Three Gorges Reservoir Region's Eco-environmentMinistry of EducationCollege of Environment and EcologyChongqing UniversityChongqing400045PR China Research Center for Eco-Environmental EngineeringDongguan University of TechnologyDongguan523808PR China 

出 版 物：《Environmental Science and Ecotechnology》 (环境科学与生态技术（英文）)

年 卷 期：2024年第21卷第5期

页      面：149-157页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(52200144,U20A20326) Key Project of Technological Innovation Application Development Plan of Chongqing City(CSTB2022TIAD-KPX0201) China Postdoctoral Science Foundation(2021M693722) Chongqing Postdoctoral Program for Innovative Talents(CQBX2021007) Technological Innovation Project of Chongqing Water&Environment Holdings Group Ltd.(KC2023-09) 

主　　题：Anaerobic fermentation Pretreatment Resource recovery Multivalent metals Solubilization 

摘      要：N,N-bis(carboxymethyl)-L-glutamate(GLDA)is an eco-friendly chelating agent that effectively extracts multivalent metal ions from waste activated sludge(WAS)flocs,which could potentially alter their ***,the effect of GLDA on the production of volatile fatty acids(VFAs)from WAS is not well ***,we demonstrate that pretreatment with GLDA at a concentration of 200 mmol per kg VSS results in a significant increase of 142%in extractable extracellular polymeric substances and enhances the total VFAs yield by 64%compared to untreated *** reveal GLDA s capability to mobilize organic-binding multivalent metal ions within sludge ***,post-pretreatment analyses showed the release of 69.1 mg L^(-1) of Ca and 109.8 mg L^(-1) of Fe ions from the flocs,leading to a more relaxed floc structure and a reduced apparent activation energy(10.6 versus 20 kJ mol
1)for WAS *** dynamic simulations further demonstrate GLDA s preferential binding to Fe3þand Ca2þover Mg2þ.Our study suggests that GLDA pretreatment causes minimal disruption to reactor stability,thereby indicating the stability of microbial community *** has emerged as a viable pretreatment agent for enhancing volatile fatty acids production from waste activated sludge.