Novel adsorbents based on eggshell functionalized with iron oxyhydroxide for phosphorus removal from liquid effluents

Almeida, Patrícia V.; Santos, Andreia F.; Lopes, Daniela; Gando-Ferreira, Licínio M.; Quina, Margarida J.

doi:10.1016/j.jwpe.2020.101248

Cited by 17 publications

(4 citation statements)

References 33 publications

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“…For the preliminary treated effluent, the removal efficiency grew with increasing adsorbent concentration, reaching up to 85% removal. Almeida et al (2020) observed P removal decreased from 99% in stock solutions to 51,5% in wastewater effluent. They attributed the reduction to the complex nature of the effluent in comparison to the stock solutions.…”

Section: Phosphorus Removalmentioning

confidence: 84%

Phosphorus removal in domestic wastewater treatment plant by calcined eggshell

Fritzen

Benetti

2021

Water Science and Technology

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Recovery of phosphorus (P) from wastewater is a topic of great interest. Besides being a non-renewable resource, P discharge in receiving waters can trigger algae blooms. The present study aimed to quantify the removal of P from two sites at a wastewater treatment plant using calcined eggshell (CES) as adsorbent. CES was prepared from raw shells calcined at 600 °C (CES600) and 800 °C (CES800). Calcined eggshells at 800 °C proved to be an efficient material for P removal. Efficiencies greater than 70% were achieved using CES800 concentrations of 0.1 g L−1 for synthetic sample, 0.3 g L−1 for preliminary treated wastewater and 20 g L−1 for supernatant from sludge anaerobic digester. The adsorption process was fast, occurring mostly in the first 30 minutes. Both Langmuir and Freundlich isotherms fitted the experimental data on adsorption. In kinetic experiments, a pseudo-second order model fitted P adsorption from synthetic, preliminary effluent and digester supernatant. Thermogravimetric analysis showed a 54% eggshell mass loss at 800 °C. Calcination increased calcium and reduced carbon fractions in the eggshells, while increasing the surface area.

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Section: Phosphorus Removalmentioning

confidence: 84%

Phosphorus removal in domestic wastewater treatment plant by calcined eggshell

Fritzen

Benetti

2021

Water Science and Technology

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“…CES700 achieved an adsorption capacity of about 39 mg PO 4 equivalents / g at pH 8 ( Santos et al, 2019 ). In the acidic range (pH < 6), an adsorbent material produced with iron oxyhydroxide and calcined eggshell (700°C) at a ratio of 1:0.5 (OFeCES.0.5) showed the best phosphate adsorption properties with a maximum adsorption capacity of 70 mg PO 4 equivalents/g ( Almeida et al, 2020 ).…”

Section: Patented Biotechnological Applications For Eggshellmentioning

confidence: 99%

Biotechnological Applications of Eggshell: Recent Advances

Ahmed

Younes

et al. 2021

Front. Bioeng. Biotechnol.

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The eggshell (ES) provides protection against pathogenic and physical insults while supplying essential metabolic and nutritional needs for the growing avian embryo. It is constituted mainly of calcium carbonate arranged as calcite crystals. The global chicken egg production in 2018 was over 76.7 million metric tons. In industrialized countries, about 30% of eggs are processed at breaker plants that produce liquid egg products and large quantities of solid ES waste. ES waste is utilized for a variety of low-value applications, or alternatively is disposed in landfill with associated economic and environmental burdens. The number of patents pertaining to ES applications has increased dramatically in recent years; of 673 patents granted in the last century, 536 (80%) were published in the last two decades. This review provides a snapshot of the most recent patents published between 2015 and 2020, with emphasis on different biotechnological applications of ES waste, and summarizes applications for biomedical, chemical, engineering, and environmental technologies. Biomedical technologies include the production of calcium lactate, calcium phosphate, and health-promoting products, while chemical technologies include plant growth promoters, food processing and production, and biodiesel oil catalysis along with active calcium, carbon, soluble proteins, organic calcium, and ultrafine calcium carbonate sources. Engineering technologies address material engineering and nanoparticle production, while environmental technologies pertain to production of biomass, solubilization of sludge as well as production of magnetic ES adsorbents and adsorption of heavy metals, organics, total nitrogen and fluoride, soil pollutants, and radioactive compounds. Although the number of ES-based patents has exponentially increased in the last decade, exploration of innovative top-down approaches and ES development as a physical platform are new endeavors that are expected to further increase the upscaling of ES waste exploitation.

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“…Large quantities are disposed into landfills. Various low-cost eggshell adsorbents have been used for the removal of phosphate, including iron oxyhydroxide eggshell [29], calcined eggshell [30], aluminum-modified eggshell [27], etc. The major component of eggshells is CaCO 3 [27], and it has been established by various researchers that CaCO 3 possesses an excellent capacity for phosphate adsorption [31], making any material containing it a good adsorbent for phosphate removal in wastewater.…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis of ZnO‐Activated Eggshell@kaolinite: Sorbents for Phosphate Capture in Water

Bayode,

Badamasi,

Olusola

et al. 2023

Chem Eng & Technol

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The availability of colossal amounts of phosphate in water bodies has led to serious environmental challenges all over the world. In this study, a new adsorbent was synthesized using treated kaolinite clay, pulverized eggshells, and ZnCl2. Surface characterizationof these adsorbents showed the availability of functional moieties, morphological variations, pore sizes, particle sizes, etc. Adsorption of phosphate occurs via multiple mechanisms, comprising ligand exchange, complexation, hydrogen bonding, and electrostatic interaction, among others. The effect of pH, showed that maximum adsorption of 93.3 % was achieved at pH 3.0. It was also shown that these cost‐effective adsorbents could be regenerated in six cycles, hence increasing their applicability.

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Novel adsorbents based on eggshell functionalized with iron oxyhydroxide for phosphorus removal from liquid effluents

Cited by 17 publications

References 33 publications

Phosphorus removal in domestic wastewater treatment plant by calcined eggshell

Phosphorus removal in domestic wastewater treatment plant by calcined eggshell

Biotechnological Applications of Eggshell: Recent Advances

One‐Pot Synthesis of ZnO‐Activated Eggshell@kaolinite: Sorbents for Phosphate Capture in Water

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