Controlling struvite particles’ size using the up-flow velocity

Tarragó, Elena; Puig, Sebastià; Ruscalleda, Maël; Balaguer, M. Dolors; Colprim, Jesús

doi:10.1016/j.cej.2016.06.036

Cited by 67 publications

(36 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…K + and PO 4 3‐ were adjusted (using KCl and Na 3 PO 4 ·H 2 O, respectively) to the concentrations of the real ADox manure (500 mg K + L ‐1 , 250 mg PO 4 3‐ L ‐1 and <10 mg NH 4 + L ‐1 ), phosphate being the limiting compound. Magnesium was dosed in excess to ensure the formation of K‐struvite, in a Mg/P molar ratio around 2 …”

Section: Methodsmentioning

confidence: 99%

“…K‐struvite is an inorganic phosphate mineral that contains equimolar concentrations of magnesium (Mg 2+ ), potassium (K + ) and phosphate (PO 4 3‐ ). Its composition is similar to struvite (MgNH 4 PO 4 ·6H 2 O), but it contains the most limited macronutrient in soils (potassium) instead of nitrogen, and is also considered an efficient fertilizer . In spite of this, K‐struvite has been hardly investigated, and mainly from synthetic urine or real urine .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Towards a methodology for recovering K‐struvite from manure

Tarragó

Ruscalleda

Colprim

et al. 2018

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND This study provides a methodology for recovering two essential macronutrients (potassium and phosphorus) from the liquid fraction of manure. This methodology paves the way for K‐struvite recovery from manure by determining the suitable operational conditions (pH and temperature). RESULTS The theoretical operational conditions were established by modelling and experimentally adjusted with manure, achieving the highest recoveries (80% of P‐recovery) at pH 10 and 38 °C when using a 10% manure solution. Then, the suitable operational conditions were evaluated using 0–10–50–100% manure solutions. The lowest percentages of manure (0–10%) favoured the co‐precipitation of other products besides K‐struvite (magnesium phosphate and magnesium hydroxide); and at the highest percentages of manure (50–100%), all the phosphate was recovered as K‐struvite, but also the co‐precipitation of magnesium hydroxide due to the Mg/P molar ratio applied (Mg/P = 2). Suspended particles acted as nuclei for heterogeneous nucleation and favoured the aggregation of crystals resulting in a star‐asterisk form. CONCLUSION The viability of the process was demonstrated, this study being the first proof‐of‐concept of K‐struvite recovery from complex waste streams. © 2017 Society of Chemical Industry

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards a methodology for recovering K‐struvite from manure

Tarragó

Ruscalleda

Colprim

et al. 2018

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…Elevated NH 4 + and PO 4 3− concentrations make anaerobic digestion supernatant a viable stream for P recovery in the form of struvite or calcium phosphates (Cusick et al, 2014; Kazadi Mbamba et al, 2015, 2016; Musvoto et al, 2000). Recovery of P occurs using either anaerobic digestion or centrifuge effluent (Tarragó et al, 2016; Kazadi Mbamba et al, 2016; Jia et al, 2017). Influent wastewater contains concentrations of ions such as Ca 2+ , Na + , K + , and Cl − that can potentially play a role in the precipitation recovery processes (Burton et al, 2013) (Supplemental Table S2).…”

Section: Recovered Phosphorusmentioning

confidence: 99%

Toward a Regional Phosphorus (Re)cycle in the US Midwest

et al. 2019

View full text Add to dashboard Cite

Redirecting anthropogenic waste phosphorus (P) flows from receiving water bodies to high P demand agricultural fields requires a resource management approach that integrates biogeochemistry, agronomy, engineering, and economics. In the US Midwest, agricultural reuse of P recovered from spatially colocated waste streams stands to reduce point‐source P discharges, meet agricultural P needs, and—depending on the speciation of recovered P—mitigate P losses from agriculture. However, the speciation of P recovered from waste streams via its chemical transformation—referred to here as recovered P (rP) differs markedly based on waste stream composition and recovery method, which can further interact with soil and crop characteristics of agricultural sinks. The solubility of rP presents key tensions between engineered P recovery and agronomic reuse because it defines both the ability to remove organic and inorganic P from aqueous streams and the crop availability of rP. The potential of rP generation and composition differs greatly among animal, municipal, and grain milling waste streams due to the aqueous speciation of P and presence of coprecipitants. Two example rP forms, phytin and struvite, engage in distinct biogeochemical processes on addition to soils that ultimately influence crop uptake and potential losses of rP. These processes also influence the fate of nitrogen (N) embodied in rP. The economics of rP generation and reuse will determine if and which rP are produced. Matching rP species to appropriate agricultural systems is critical to develop sustainable and financially viable regional exchanges of rP from wastewater treatment to agricultural end users. Core Ideas There is high potential for recovering P (rP) from point sources for agricultural reuse. rP speciation depends on recovery source and method, interacts with soils and crops. Engineering, agronomic, and economic considerations of rP are context‐specific.

show abstract

“…The liquid phase was discharged by overflow, and the product formed was settled in the collector and recovered daily. As magnesium was the limiting compound in the influent, a concentrated solution of Mg 2+ was fed to achieve the desired Mg 2+ /PO 4 3− molar ratio of 2–2.5 …”

Section: Methodsmentioning

confidence: 99%

“…Aeration was applied in the riser zone and controlled by a mass flow meter (Rotameter, 2100/INOX) to maintain the up‐flow rate desired. This velocity in the riser was related to the particle size . Finally, a control panel (Memograph; Endress + Hauser, RSG40) was used to control the pH in the riser, fixed at 8.5, dosing NaOH 1 mol L −1 .…”

Section: Methodsmentioning

confidence: 99%

Effect of suspended solids and its role on struvite formation from digested manure

Tarragó

Sciarria

Ruscalleda

et al. 2018

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND Phosphorus (P) resources are limited, and to assure its supply, efforts must be focused on P‐recovery rather than its removal. In this sense, manure is a mining opportunity for nutrient recovery, for example, when recovered as struvite. However, manure treatment is challenging due to its characteristics, such as the solids content, one of the main hindrances to struvite formation. Many researchers have setablished a limit value of 1 g of total suspended solids (TSS)·L−1 to avoid interferences with struvite precipitation. Despite this, few studies have focused on the effect of solids on struvite formation. RESULTS This study identified the role of solids in struvite nucleation and growth, and its interaction. The viability of struvite recovery from digested manure is ensured, even at high concentrations of solids (from 1 to 3 g TSS L−1), recovering more than 95% of the phosphorus as struvite. The results showed that solids not only did not interfere on struvite formation, but also played an important role during struvite crystallization, acting as nuclei favoring heterogeneous nucleation. CONCLUSIONS Suspended particles favored the aggregation and/or agglomeration of struvite crystals, forming crystal nets and recovering bigger crystalline structures. The presence of solids on the recovered product might be beneficial for meeting crop demands and maintaining or restoring soil fertility, while applying an excellent slow‐release fertilizer. © 2018 Society of Chemical Industry

show abstract

Controlling struvite particles’ size using the up-flow velocity

Cited by 67 publications

References 29 publications

Towards a methodology for recovering K‐struvite from manure

Towards a methodology for recovering K‐struvite from manure

Toward a Regional Phosphorus (Re)cycle in the US Midwest

Effect of suspended solids and its role on struvite formation from digested manure

Contact Info

Product

Resources

About