文献类型： 外文期刊

作者： Li, Yingxue ¹ ; Xu, Defu ² ; Lin, Haizhi ² ; Wang, Wenhua ⁵ ; Yang, Hong ⁶ ;

作者机构： 1.Nanjing Univ Informat Sci &Technol, Sch Appl Meteorol, Nanjing 210044, Peoples R China

2.Collaborat Innovat Ctr Atmospher Environm & Equipm, Nanjing 210044, Peoples R China

3.Jiangsu Key Lab Atmospher Environm Monitoring & Po, Nanjing 210044, Peoples R China

4.Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Nanjing 210044, Peoples R China

5.Guizhou Acad Agr Sci, Rapeseed Res Inst, Guiyang 550008, Peoples R China

6.Univ Reading, Dept Geog & Environm Sci, Reading RG6 6AB, England

关键词： Biochar; Nitrogen and phosphorus; Recovery efficiency; Fluidized bed reactor; Struvite; Slow-release fertilizer

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.91； 五年影响因子：8.549 ）

ISSN： 0301-4797

年卷期： 2023 年 325 卷

页码：

收录情况： SCI

摘要： With the exacerbating water eutrophication globally, it is important to recover nitrogen (N) and phosphorus (P) from sewage for recycle. In this study, coconut shell biochar and ethylene diamine tetraacetic acid (EDTA) were added into the designed fluidized bed reactor (FBR) to create struvite-biochar. N and P released from struvite-biochar and the recovery efficiency of N and P from concentrated sludge supernatant were analyzed. Results showed that the optimal operation condition for hydraulic retention time (HRT), pH, Mg/P molar ration, and addition amount EDTA were 90 min, 9.5, 1.2, and 0.2 g/L, respectively. The recovery efficiency of NH4+-N and PO43--P, and purity struvite for FBR were 34.41%-38.05%, 64.95-68.40%, and 84.15%, respectively. The recovery efficiency of NH4+-N and PO43--P were respectively increased by 7.23% and 5.36% when FBR with addition of 0.33 g/L coconut shell biochar, but purity struvite from struvite-biochar decreased by 45.70%. Contents of As, Cd, Pb, and Cr in struvite and struvite-biochar were all lower than Chinese Standard Limits of Fertilizer. Compared to commercial chemical fertilizer, such as superphosphate and urea, struvite-biochar and struvite have slowly released N and P. The amounts of released P, NO3--N and NH4+-N from struvite-biochar were higher than struvite during the five leaching times. Compared with struvite, the total amounts of released P, NO3--N and NH4+-N from struvite-biochar increased by 4.9%, 3.5% and 8.3%, respectively. Therefore, it is valuable to add biochar into FBR to recovery N and P from concentrated sludge supernatant and make struvite-biochar as a slow-release fertilizer.