Albert Magrí

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Kâmil VARINCA

Adıyaman University

Muhammad Sonny Abfertiawan

Institut Teknologi Bandung

Nawa Raj Khatiwada

Kathmandu University

Denny Helard

Universitas Andalas

Davide Scaglione

Politecnico di Milano

Naima Abbadi

University of Ottawa | Université d'Ottawa

Sharad C. Phatak

The University of Georgia

Yuval Baruch

Israel Antiquities Authority

Jingwei Ma

Washington State University

Richard Matasic

University of medicine Zagreb

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Papers by Albert Magrí

Recovery of potassium-rich struvite in a pig farm downstream a nitrogen removal treatment plant: technological, agricultural and economic assessment

by Albert Magrí, Elena González, and Francesc Domingo

Waste and Biomass Valorization, 2024

Simultaneous recovery of phosphorus (P), potassium (K), and magnesium (Mg) as precipitated phosph... more Simultaneous recovery of phosphorus (P), potassium (K), and magnesium (Mg) as precipitated phosphate salt (PPS) was assessed (K-struvite and hazenite included) in a pig farm downstream a nitrification-denitrification unit. The precipitation process was addressed using denitrified effluent (DE) and waste sludge (WS) purged from the bioreactor. For DE, the inherent unbalanced Mg:K:P molar ratio (1.4:9.5:1.0; 1.6 g K/L) led to poor K recovery (≤ 15%) if considering P as the limiting element. By considering K as limiting, the supply of external sources of Mg and P (final Mg:K:P as 1.0:0.5:1.0) allowed the recovery of most of the K available. For WS, a selective pretreatment with oxalic acid resulted in an available Mg:K:P ratio of 0.8:1.2:1.0. Risk of interference by free calcium will exist if the operational parameters are not optimized, thus constraining the recovery of K (≤ 51%). A fertilization field trial demonstrated the fertilizing value of the recovered PPS with respect to a mineral fertilizer, and the increased risk of soil salinization under a reiterative application of processed DE. Scenarios without extra addition of nutrients will introduce an enhanced handling in the current nutrient management planning of the pig farm. On the contrary, the trade of the PPS formed becomes essential when external sources of Mg and P were added.

Reagent-free phosphorus precipitation from a denitrified swine effluent in a batch electrochemical system

Heliyon, 2024

There is high interest in the recovery of phosphorus (P) from wastewater through crystallization ... more There is high interest in the recovery of phosphorus (P) from wastewater through crystallization processes. However, the addition of chemical reagents (e.g., sodium hydroxide) to raise the pH may result in high treatment costs and increased concentrations of undesired metal ions (e.g., sodium). As an alternative, in this research we considered electrochemical mediated precipitation at low current densities (0.4–1.2 A m−2) without using chemical reagents. For that purpose, a two-chamber electrochemical system was operated in batch for treating denitrified swine effluent (48 mg P L−1). By applying current at 1.2 A m−2, and targeting pH 11.5, a maximum P removal rate of 33.4 mmol P (L·d−1) was obtained while the P removal efficiency was above 90 %. New solids that formed mostly remained suspended in the catholyte. Before discharge, the catholyte effluent was recirculated to the anodic compartment to neutralize the pH, achieving a final pH of 6.4 ± 0.1. Chlorine (Cl2) production in the anodic compartment was favored by a small anode surface and a high initial pH of the catholyte. Although the production of chlorine achieved was limited (the highest concentration was 8.6 ± 0.1 mg Cl2 L−1) these findings represent a new opportunity for the recovery and onsite use of this side-product. Electrochemical impedance spectroscopy tests confirmed that the deposition of solids inside the cathodic compartment during the experimental period was limited. Membrane analysis revealed significant scaling of carbonate compounds. The electrochemical treatment described above was shown as a promising alternative to sodium hydroxide and sulfuric acid dosage for pH adjustment when crystallizing phosphate salts.

Achieving mainstream partial nitritation with aerobic granular sludge treating high-rate activated sludge effluent

Journal of Water Process Engineering, 2024

New configurations for wastewater treatment plants (WWTPs) are under development to increase thei... more New configurations for wastewater treatment plants (WWTPs) are under development to increase their self-sufficiency and sustainability. One is the A-B process, in which the A-stage is designed to maximize the redirection of influent chemical oxygen demand (COD) to the production of biogas. A promising A-stage alternative is the high-rate activated sludge (HRAS). B-stage, on the other hand, can consist of the combined partial nitritation (PN)-anaerobic ammonium oxidation (anammox). In this study, PN with aerobic granular sludge (AGS) was attempted under mainstream conditions at pilot scale. The effluent of a HRAS system – ideally operating at 2 g/L of total suspended solids, 0.5 mg/L of dissolved oxygen and 1 h of hydraulic retention time (52 ± 13 % COD removal) – was fed to the PN-AGS reactor initially inoculated with floccular sludge. Granulation and PN were studied with daily/seasonal fluctuations and without adding external reagents. Selective wasting from the top of the settled sludge bed was found a successful strategy to trigger granular sludge formation. The maintenance of a low sludge volume index (SVI < 100 mL/g) was helpful enough for improved operation of the system (i.e., COD removal and PN). Stable PN was achieved due to the suppression of the nitrite oxidizing bacteria activity by inhibitory levels of free nitrous acid. Finally, working with fast settling biomass at long settling times reduced the influent-biomass-nitrite contact and, thus, denitritation.

Phosphorus recovery from domestic wastewater: A review of the institutional framework

Journal of Environmental Management, 2024

Phosphorus (P) is an essential element for life that must be managed sustainably. The institution... more Phosphorus (P) is an essential element for life that must be managed sustainably. The institutional framework for P recovery from wastewater includes policies, regulations, plans, and actions that promote the ecovery, recycling, and safe use of this element, aimed at moving toward more sustainable nutrient management and environmental protection. This review analyzes the status of the institutional framework for P recovery from wastewater in different countries around the world. Europe is the continent where the most progress has been made in terms of legislation. Countries such as Germany, the Netherlands, Austria, and Denmark have already implemented policies and regulations that promote environmental protection, as well as P recovery and reuse. In other parts of the world, such as the United States, China, and Japan, there have also been significant advances in promoting the closure of the P cycle, with the implementation of advanced recovery technologies in wastewater treatment plants and regional/national action plans. By contrast, in Latin America there has been little progress in P treatment and recovery, with a weak regulatory framework, unclear goals, and insufficient allocation of techno-economic resources. In this context, it is necessary to reinforce the comprehensive institutional framework, which covers technological aspects, economic incentives, political agreements, and regulations, to promote the sustainable management of this valuable resource.

Recuperación de estruvita potásica en el tratamiento de purines de cerdo

Retema, 2023

E l fósforo (P) y el potasio (K) son elementos esenciales para los cultivos. Actualmente, la indu... more E l fósforo (P) y el potasio (K) son elementos esenciales para los cultivos. Actualmente, la industria de los fertilizantes obtiene ambos macronutrientes mayoritariamente del sector minero, a modo de recursos no renovables. Las reservas de roca fosfórica, como fuente típica de P (Cordell et al., 2009), y de potasa, como fuente típica de K (Ciceri et al., 2015), están distribuidas de manera desigual en el planeta, y esta realidad conlleva ines-tabilidades geopolíticas y grandes impactos ambientales. De acuerdo con el paradigma de la economía circular, mediante la aplicación de nuevos métodos productivos de estos nutrientes basados en estrategias de recuperación a partir de subproductos orgánicos como las deyecciones ganaderas (Chojnacka et al., 2020), es posible contribuir a unos procesos productivos más sostenibles mientras se protege la salud humana y el medio ambiente. Actualmente en la UE, la roca fosfórica y el P están catalogados como materias primas críticas de gran importancia para la economía de la Unión, con un riesgo elevado asociado a su suministro (EC, 2020), mientras que las sales fosfóricas precipitadas recuperadas de fuentes secundarias están tipificadas en el marco del Reglamento de productos fertilizantes (UE) 2019/1009 (EPC, 2019; Huygens et al., 2019). La precipitación de la sal K-estruvita (MgKPO4•6H2O), con una relación Recuperación de estruvita potásica en el tratamiento de purines de cerdo

Albert Magrí

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