期刊论文详细信息
WATER RESEARCH 卷:143
CO2-assisted phosphorus extraction from poultry litter and selective recovery of struvite and potassium struvite
Article
Shashvatt, Utsav1  Benoit, Josh1  Aris, Hannah1  Blaney, Lee1 
[1] Univ Maryland Baltimore Cty, Dept Chem Biochem & Environm Engn, Engn 314, 1000 Hilltop Circle, Baltimore, MD 21250 USA
关键词: Phosphorus;    Nutrient recovery;    Struvite;    Poultry litter;    Animal manure;    Fertilizer;   
DOI  :  10.1016/j.watres.2018.06.035
来源: Elsevier
PDF
【 摘 要 】

Phosphorus recovery from industrialized poultry operations is necessary to ensure sustainable waste management and resource consumption. To realize these goals, an innovative, two-stage process chemistry has been developed to extract nutrients from poultry litter and recover value-added products. Over 75% phosphorus extraction was achieved by bubbling carbon dioxide into poultry litter slurries and adding strong acid to reach pH 4.5-5.5. After separating the nutrient-deficient poultry litter solids and the nutrient-rich liquid, the extract pH was increased through aeration and strong base addition. Over 95% of the extracted phosphorus was recovered as solid precipitate at pH 8.5-9.0. High-purity struvite and potassium struvite products were selectively recovered through pH control, introduction of a calcium-complexing agent, and addition of magnesium chloride. The nitrogen-to-phosphorus-to potassium (NPK) ratio of the recovered solids was controlled through aeration and pH adjustment. Precipitation at pH 8.5-9.0 and 10.5-11.0 resulted in NPK ratios of 2.0:1.0:0.1 and 0.9:1.0:0.2, respectively. The process effluent was effectively recycled as makeup water for the subsequent batch of poultry litter, thereby decreasing water consumption and increasing overall nutrient recovery. Sequencing batch operation yielded greater than 70% phosphorus recovery within a 45-min process, demonstrating the potential for this technology to alleviate nutrient pollution in agricultural settings and generate an alternative supply of phosphorus fertilizers. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free   

【 预 览 】
附件列表
Files Size Format View
10_1016_j_watres_2018_06_035.pdf 3716KB PDF download
  文献评价指标  
  下载次数:5次 浏览次数:0次