Capture and recycling of ammonium by dolomite-aided struvite precipitation and thermolysis
- PMID: 28858711
- DOI: 10.1016/j.chemosphere.2017.08.065
Capture and recycling of ammonium by dolomite-aided struvite precipitation and thermolysis
Abstract
The capture and reuse of NH4+ is an ideal solution to treat NH4+-containing wastewater. The capture and reuse process needs to be clean and cost-effective. Currently, however, there are many obstacles, particularly in the availability, cost, and recovery of the chemical sources required. Here, we demonstrate a clean and efficient method to capture and recycle NH4+ by a dolomite-aided struvite precipitation process. Dolomite calcined carefully in CO2 atmosphere was used as a Mg source to react with PO43- (KH2PO4) and NH4+ in model wastewater (2000 mg L-1 NH4+). The precipitation was performed at nMg2+:nNH4+:nPO43- = 1:1:1.2 and pH = 8.0 for 2 h; 89.7% of NH4+ was recovered in the form of struvite precipitate. The competition between K+ and NH4+ in the model wastewater led to the formation of K-struvite (MgKPO4·6H2O) and struvite (MgNH4PO4·6H2O). The formation of K-struvite resulted in a decrease in the NH4+ removal rate. When struvite was heated at 110 °C for 4 h, the NH4+ release rate from the thermolysis reached 75.7%. Thermolysis readily occurred as an unstable Ca2+-CO32--NH4+ system formed in the mixture of MgNH4PO4·6H2O and CaCO3. The elements Mg and P that were obtained during the struvite precipitation-thermolysis-reprecipitation process can be repeatedly used. After 6 cycles, under the conditions pH = 9.0, nMg2+:nNH4+:nPO43- = 1:1:1 and reaction time of 2 h, up to 78.3% of NH4+ was removed from the model wastewater.
Keywords: Ammonium; Dolomite; Phosphate; Struvite; Thermolysis; Wastewater treatment.
Copyright © 2017 Elsevier Ltd. All rights reserved.
Similar articles
-
Chlorination decomposition of struvite and recycling of its product for the removal of ammonium-nitrogen from landfill leachate.Chemosphere. 2015 Oct;136:289-96. doi: 10.1016/j.chemosphere.2014.10.078. Epub 2014 Nov 20. Chemosphere. 2015. PMID: 25465950
-
Phosphate recovery from anaerobic digester effluents using CaMg(OH)4.J Environ Sci (China). 2016 Jun;44:260-268. doi: 10.1016/j.jes.2016.02.006. Epub 2016 Mar 17. J Environ Sci (China). 2016. PMID: 27266323
-
Nutrient removal from digested swine wastewater by combining ammonia stripping with struvite precipitation.Environ Sci Pollut Res Int. 2019 Mar;26(7):6725-6734. doi: 10.1007/s11356-019-04153-x. Epub 2019 Jan 10. Environ Sci Pollut Res Int. 2019. PMID: 30632036
-
Phosphorus recovery as K-struvite from a waste stream: A review of influencing factors, advantages, disadvantages and challenges.Environ Res. 2022 Nov;214(Pt 3):114086. doi: 10.1016/j.envres.2022.114086. Epub 2022 Aug 12. Environ Res. 2022. PMID: 35970377 Review.
-
Assessing the feasibility of N and P recovery by struvite precipitation from nutrient-rich wastewater: a review.Environ Sci Pollut Res Int. 2015 Nov;22(22):17453-64. doi: 10.1007/s11356-015-5450-2. Epub 2015 Sep 26. Environ Sci Pollut Res Int. 2015. PMID: 26408116 Review.
Cited by
-
Precipitation of struvite using MgSO4 solution prepared from sidestream dolomite or fly ash.Heliyon. 2022 Dec 25;8(12):e12580. doi: 10.1016/j.heliyon.2022.e12580. eCollection 2022 Dec. Heliyon. 2022. PMID: 36619443 Free PMC article.
MeSH terms
Substances
LinkOut - more resources
Full Text Sources
Other Literature Sources
Miscellaneous