Evaluation of flue gas desulfurization gypsum as a low-cost precipitant for phosphorus removal from anaerobic digestion effluent filtrate  

作　　者：Yaping Guo Adam Khalaf Wenzhuo Kong Hongzhen Ma Jiawei Liang Dongxu Zhao Zhiguo Wang Yebo Li Fuqing Xu 

机构地区：[1]Technology Innovation Center for Land Engineering and Human Settlements,Shaanxi Land Engineering Construction Group Co.,Ltd and Xi’an Jiaotong University,School of Human Settlements and Civil Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]Department of Food,Agricultural,and Biological Engineering,the Ohio State University,Columbus,OH 44691,USA [3]Shaanxi Environmental Survey and Assessment Center,Xi’an 710054,China

出　　处：《International Journal of Agricultural and Biological Engineering》2024年第4期198-206,共9页国际农业与生物工程学报（英文）

基　　金：supported by the Shaanxi Province Science Foundation for Youths(Grant No.2023-JC-QN-0202);the Technology Innovation Center for Land Engineering and Human Settlements(Grant No.201912131-D2);the Shaanxi Province Key Research and Development Projects(Grant No.2022ZDLNY02-07);the“Young Talent Starting Fund”,and“Human Environment Improvements and Resources Utilization in Rural Areas”Research Projects of Xi’an Jiaotong University(Grant No.202012435).

摘　　要：Land application of anaerobic digestion(AD)effluent as a fertilizer is desirable for nutrient recycling,but often supplies excess phosphorus(P),which contributes to surface water eutrophication.Reducing the P content in AD effluent filtrate using calcium(Ca)treatment prior to land application is a potential strategy for improving effluent disposal and meeting the discharge standard.This study took flue gas desulphurization(FGD)gypsum,a by-product of coal-fired power plants,as a low-cost Ca source,and combined with traditional phosphorus removal agents to achieve high phosphorus removal efficiency with less chemical cost.As the results showed,FGD gypsum dosages of 20 mmol/L Ca(3.44 g/L)and 40 mmol/L Ca(6.89 g/L)removed up to 97.1%of soluble P(initially 102.8 mg/L)within 60-90 minutes.Combining FGD gypsum treatment with traditional chemical treatments using calcium hydroxide[Ca(OH)2]or ferric chloride(FeCl3)could achieve>99%P removal with reduced chemical costs.This study demonstrated that FGD gypsum is an efficient calcium-based precipitant for phosphorus removal,offering a cost-effective and sustainable approach to enhance wastewater treatment practices and meet discharge standards in wastewater management.

关 键 词：flue gas desulfurization gypsum anaerobic digestion effluent precipitation phosphorus removal EUTROPHICATION 

分 类 号：X703[环境科学与工程—环境工程]