Model and experiment-based evaluation of seawater-based urine phosphorus recovery(SUPR)process  

作　　者：Wen-Tao Tang Yihang Xiao Yang-Fan Deng Yunkai TAN Guang-Hao Chen Tianwei HAO 

机构地区：[1]Zhuhai UM Science&Technology Research Institute,Zhuhai 519031,China [2]Department of Civil and Environmental Engineering,The Hong Kong University of Science&Technology,Hong Kong 999077,China [3]Department of Civil and Environmental Engineering,Faculty of Science and Technology,University of Macao,Macao 999078,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第11期133-144,共12页环境科学与工程前沿（英文）

基　　金：supported by the Excellent Young Scientists Fund of National Natural Science Foundation of China(No.52222008);the Science and Technology Development Fund,Macao SAR,China(No.0026/2022/A1);the Shenzhen Science and Technology Innovation Committee(No.EF2023-00072-FST);the Research Grants Council of Hong Kong Special Administrative Region,China(No.T21-604/19-R);the Hong Kong Innovation and Technology Commission,China(No.ITC-CNERC14EG03).

摘　　要：Leveraging seawater toilet flushing system in Hong Kong,China,a Seawater-based Urine Phosphorus Recovery(SUPR)process that integrates ureolysis and phosphorus(P)recovery was proposed in our earlier work.In this study,a thermodynamic model was applied to evaluate the effects of ureolysis and the seawater-to-urine mixing ratio(S/U ratio)on P precipitation in the SUPR system.The results suggested that effective P recovery was thermodynamically feasible across a wide range of S/U ratios,with elevated pH levels resulting from ureolysis being critical for P precipitation.Furthermore,a SUPR reactor was developed to validate this process.When the hydraulic retention time(HRT)exceeded 3 h and the S/U ratio was lower than 3:1,more than 98%of P could be recovered without urine storage,chemical dosage,or external mixing.Further decrease in the HRT and increase in S/U ratio caused flushing out of fine precipitates,resulting in a relatively low P recovery efficiency.However,this could be advantageous when downstream urine nitrification is implemented,as dilution of urine can alleviate the inhibitory effects of free ammonia and free nitrous acid,as well as overcome the P limitation problem,thus facilitating urine nitrification.Consequently,there is a trade-off between optimizing P recovery and nitrification efficiencies.

关 键 词：Phosphorus recovery STRUVITE Urine nitrification Source separation Seawater toilet flushing 

分 类 号：X703[环境科学与工程—环境工程]