Fly ash as reactive sorbent for phosphate removal from treated waste water as a potential slow release fertilizer

Hermassi, Mehrez; Valderrama, César; Moreno, Natàlia; Font, Oriol; Querol, Xavier; Batis, Narjès Harrouch; Cortina, José Luis

doi:10.1016/j.jece.2016.11.027

Cited by 73 publications

(24 citation statements)

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“…as phosphate concentration exhibited slower evolution in comparison with ammonium. Similar results have been reported by Hermassi et al ., when studying the extraction of phosphate by fly‐ash and synthetic zeolites in the calcium form …”

Section: Resultsmentioning

confidence: 99%

Simultaneous recovery of ammonium and phosphate from simulated treated wastewater effluents by activated calcium and magnesium zeolites

You

Valderrama

Cortina

2017

J of Chemical Tech & Biotech

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BACKGROUND\ud \ud In this study a sodium zeolite synthesized from coal fly ash (NaP1-NA) was modified to calcium and magnesium forms (Ze-Ca, Ze-Mg) as sorbent materials for simultaneous recovery of ammonium and phosphate from simulated treated wastewater effluents.\ud RESULTS\ud \ud Increasing the temperature during the modification step to magnesium form improved the zeolite conversion. The maximum sorption capacities obtained were 123.1±9.1 mg NH4 g-1 and 119.5±7.5 mg PO4 g-1 in an ammonium/phosphate binary system for Ze-Ca, while 55.2±2.4/ 60.5 ±14.1 and 32.3±4.4/ 23.9±3.4 were obtained for Ze-Mg1 and Ze-Mg2, respectively. The sorption process is faster for Ze-Mg zeolites and the sorption mechanism that controls the overall process, for both zeolites, is diffusion into the particle according to the HPDM and SPM models.\ud CONCLUSIONS\ud \ud Salt modification improved the performance of zeolites towards phosphate sorption. The sorption mechanism involves both ammonium exchange to the Mg and Ca ions, and precipitation of Ca and Mg phosphates or mixed ammonium-magnesium phosphate minerals such as brushite (CaHPO4.H2O) and struvite (MgNH4PO4). © 2017 Society of Chemical IndustryPeer ReviewedPostprint (author's final draft

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Section: Resultsmentioning

confidence: 99%

Simultaneous recovery of ammonium and phosphate from simulated treated wastewater effluents by activated calcium and magnesium zeolites

You

Valderrama

Cortina

2017

J of Chemical Tech & Biotech

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“…erefore, except controlling the environmental pollution greatly, consequently, the preparation cost of ceramic membranes would reduce significantly by reusing coal ash as the main raw materials to fabricate the new type of tubular ceramic membrane. e application of fly ash is mostly focused on cement concrete production, soil improvement, sewage treatment, construction engineering, and other fields [30][31][32][33][34][35][36][37][38]. ere are relatively few studies on the elaboration of porous ceramic membranes by fly ash.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Coal Ash Ceramic Membranes for Water and Heat Recovery from Flue Gas

Chen

Wei

et al. 2019

Journal of Chemistry

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In this paper, the manufacturing process of microceramic membrane is summarized. The main material of this membrane is fly ash which can reduce the sintering temperature and save the costs. The coal ash ceramic membrane (CACM) was characterized by XRD, SEM, and mercury intrusion method. The results show that the mullite phase formed by CACM at the sintering temperature of 1250°C has morphology and structural characteristics similar to the commercial microceramic membrane. The membrane surface is uniform and dense, without cracks; the pore diameter is 1–4 μm, and the porosity is 26.6%. Furthermore, the CACM and CMCM were compared at the aspects of water and heat recovery performance using flue gas. The experiment indicated that when the flue gas temperature was 50–85°C, the water recovery performance of these two kinds of membrane was similar. Also, the heat transfer capability of the coal ash ceramic membrane was close to that of the commercial microceramic membrane when the temperature range of flue gas was controlled between 50°C and 70°C. When the temperature of flue gas reaches 80°C, the heat transfer performance of the commercial ceramic membrane is better, and the difference of heat recovery between these two kinds of membranes is 19.3%. In general, the CACM and CMCM have similar mass transfer performance, and the heat transfer efficiency of CACM is lower than that of CMCM, but the costs of CACM is much lower than that of CMCM which has a good research prospect in the future.

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“…Potential fertilizer, even in calcareous soils. Brushite (Hermassi et al, 2017b) In general, wastes generated from industrial processes (e.g., coal and biomass combustion fly ash, industrial sludge or mineral tailings) or low-cost natural sorbents have been used. The main rationale for the selection of the materials is the high content of Mg or Ca minerals (oxides), carbonates or silicates to promote the recovery of Mg-and Ca-phosphates minerals.…”

Section: Treated Waste Watermentioning

confidence: 99%

Simultaneous ammonium and phosphate recovery and stabilization from urban sewage sludge anaerobic digestates using reactive sorbents

Hermassi

Dosta

Valderrama

et al. 2018

Science of The Total Environment

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The use of low-cost inorganic sorbents as a new sustainable strategy to enhance the valorization of nutrients (N-P-K), from the urban water cycle (e.g., side streams from sewage sludge anaerobic digestion), in agriculture applications is presented. The simultaneous recovery and stabilization of ammonium and phosphate by using a mixture of two reactive sorbents (Na and K zeolites and magnesium oxide) was evaluated. The nutrients stabilization process, favoured at alkaline pH values, is carried out by a) the precipitation of phosphate ions with magnesium and/or ammonium ions and b) the sorption of ammonium by Na- and K-zeolites. MgO(s) promoted the stabilization of phosphate as bobierrite (Mg(PO)(s)) or struvite (MgNHPO(s)) depending on the applied dose. Doses with the stoichiometric molar ratio of Mg/P promote the formation of bobierrite, while molar ratios higher than 3 favour the formation of struvite. Na zeolites (NaP1-NA, NaP1-IQE) demonstrated efficiency on ammonium stabilization between 60±2 (for 15gZ/L) to 90±3% (for 50gZ/L). The ammonium recovery efficiency is limited by the zeolite sorption capacity. If the target of the fertilizing criteria should include K, then the use of a K-zeolite (e.g., 5AH-IQE) provides a good solution. The optimum pH for the precipitation of struvite and bobierrite is 9.5 and the optimum pH for ammonium removal is between 4 and 8.5. N is present in higher concentrations (up 0.7-1gNH/L) when pH is ranged between 8.2 and 8.6. The ammonium recovery ratios were better than those previously reported using only magnesium oxide or even a more expensive reagent as newberrite (MgHPO(s)). The recovery mechanisms described generate low-solubility stabilized nutrients forms that potentially can be applied as slow-release fertilizers in agriculture. Thus, the use in agriculture of blends of digested sludge with low-solubility stabilized nutrients forms will improve soils quality properties in terms of organic matter and nutrients availability.

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Fly ash as reactive sorbent for phosphate removal from treated waste water as a potential slow release fertilizer

Cited by 73 publications

References 50 publications

Simultaneous recovery of ammonium and phosphate from simulated treated wastewater effluents by activated calcium and magnesium zeolites

Simultaneous recovery of ammonium and phosphate from simulated treated wastewater effluents by activated calcium and magnesium zeolites

Preparation and Properties of Coal Ash Ceramic Membranes for Water and Heat Recovery from Flue Gas

Simultaneous ammonium and phosphate recovery and stabilization from urban sewage sludge anaerobic digestates using reactive sorbents

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