https://scholars.lib.ntu.edu.tw/handle/123456789/598702
標題: | Recovery of phosphate and ammonia from wastewater via struvite precipitation using spent refractory brick gravel from steel industry | 作者: | Li D.-Y Cho Y.-C Hsu M.H Lin Y.-P. YI-PIN LIN |
關鍵字: | Calcium;Circular economy;Magnesium;Nutrients;Resource recycle;aluminum;ammonia;calcium;calcium ion;calcium phosphate;iron;magnesium ion;manganese;nitric acid;phosphate;sodium ion;struvite;sulfate;sulfite;steel;iron and steel industry;precipitation (chemistry);wastewater;wastewater treatment;Article;chemical composition;compressive strength;cost benefit analysis;effluent standard;energy dispersive X ray spectroscopy;environmental parameters;furnace;leaching;pH;precipitation;scanning electron microscopy;solution and solubility;spent refractory brick gravel;waste component removal;waste water management;water supply;X ray diffraction;sewage;Ammonia;Chemical Precipitation;Phosphates;Steel;Struvite;Waste Disposal, Fluid;Waste Water | 公開日期: | 2022 | 卷: | 302 | 來源出版物: | Journal of Environmental Management | 摘要: | Spent refractory brick (SRB) generated from the steel industry has a high magnesium content. In this study, a procedure was developed to utilize SRB gravels for efficient recovery of phosphate and ammonia from high strength wastewater via struvite (MgNH4PO4?6H2O(s)) precipitation. Mg2+ and Ca2+ were first leached from SRB gravels using nitric acid solution. Ca2+ in the solution could inhibit struvite precipitation and was sequestered by dosing SO32? to form calcium sulfite (CaSO3(s)). The resulting Mg2+-rich solution was then employed to initiate struvite precipitation for phosphate and ammonia recovery. The optimal precipitation was achieved with a molar ratio of [Mg2+]:[NH3–N]:[PO43–P] = 2:1:2 at pH 9.5. The residual phosphate in the solution can be further removed via the precipitation of calcium phosphate minerals. Overall, 99.6% phosphate and 98.2% ammonia could be recovered and the treated wastewater could meet the discharging standards of ammonia and phosphate. The resulting solids, including calcium sulfite, struvite and calcium phosphate can be potentially used in the cement industry and agriculture sector to achieve sustainable recycle of spent materials. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119048705&doi=10.1016%2fj.jenvman.2021.114110&partnerID=40&md5=76ed3e0f18dbfac567030d3ff4ef4e52 https://scholars.lib.ntu.edu.tw/handle/123456789/598702 |
ISSN: | 03014797 | DOI: | 10.1016/j.jenvman.2021.114110 |
顯示於: | 環境工程學研究所 |
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