Recovery of phosphorus as struvite from the dewatered liquor through crystallization using seawater as magnesium source

Devatha, C.P.; Rashmi, H.R.

doi:10.1016/b978-0-323-99348-7.00015-1

Resource Recovery in Municipal Waste Waters 2023

DOI: 10.1016/b978-0-323-99348-7.00015-1

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Recovery of phosphorus as struvite from the dewatered liquor through crystallization using seawater as magnesium source

C.P. Devatha

H.R. Rashmi²

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2024

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Cited by 2 publications

References 33 publications

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Nutrient Recovery via Struvite Precipitation from Wastewater Treatment Plants: Influence of Operating Parameters, Coexisting Ions, and Seeding

Santos,

Mendes,

Alvarenga

et al. 2024

Water

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Phosphorus (P) is a critical element for life, and wastewater treatment systems can be strategic points for its recovery, thereby avoiding eutrophication pollution in nature. The aim of this research was to investigate P recovery via struvite, namely in terms of the influence of operating parameters, coexisting interfering ions, and seeding. This paper focuses on synthetic solutions, although an assessment was performed on wastewater. The results of the assessment indicated that, in the synthetic solution, the minimum concentration for struvite precipitation is about 30 mg P/L, and that the Mg/P molar ratio of 1 promotes P removal efficiency with less contribution from other minerals. In order to assess the results in terms of real-world scenarios, the influence of coexisting ions (calcium and sodium) was investigated. Calcium was shown to have the greatest impact on the process, as 80% was removed for an initial concentration of 200 mg Ca/L. Indeed, these experiments generated an amorphous precipitate that did not contain struvite. The utilization of biomass ash (size < 63 µm) as seeding in crystallization increased the P removal efficiency compared to the sample without seed and helped to control the pH. The precipitation experiments with wastewater demonstrated good P removal efficiencies (over 90%) but indicated a reduction in the purity of the final product (struvite was a minor crystalline phase identified in XRD—15%wt).

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Nutrient Recovery via Struvite Precipitation from Wastewater Treatment Plants: Influence of Operating Parameters, Coexisting Ions, and Seeding

Santos,

Mendes,

Alvarenga

et al. 2024

Water

View full text Add to dashboard Cite

show abstract

Review on Phosphorus Recovery as Struvite from Wastewater

Hafiz,

Rahman,

Othman

et al. 2024

KEM

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Wastewater treatment plants, particularly anaerobic digesters, face significant challenges related to the deposition of struvite, a mineral scale composed of magnesium ammonium phosphate hexahydrate. The formation and accumulation of struvite can lead to blockages in the treatment system, reducing flow rates and overall plant efficiency. This article explores the necessity of struvite removal for proper plant function and the potential for struvite recovery due to its rich nutrient content, specifically phosphorus and nitrogen, which can be repurposed in agriculture. Struvite recovery not only mitigates mineral deposition problems but also addresses the ecological risks associated with nutrient-rich effluents. The excess nutrients in wastewater effluent can contribute to water pollution, leading to eutrophication, algal blooms, and oxygen depletion, negatively impacting aquatic ecosystems and aquatic life. Furthermore, as the world's phosphorus reserves are finite and depleting, recovering phosphorus from wastewater aids in conserving this non-renewable resource. To facilitate efficient struvite recovery, it is crucial to control the formation of struvite crystals. Key factors affecting this process include pH, temperature, supersaturation, and mixing energy. Understanding the optimal conditions for these parameters is vital for maximizing phosphorus recovery. Various technologies such as chemical precipitation, biomineralization, seeding, ultrasound, and electrochemical are being studied to enhance struvite recovery, offering sustainable and innovative approaches to address this challenge. Overall, this review explores the various techniques and technologies utilized to recover phosphorus in struvite form which contributes to the efficient and sustainable management of wastewater treatment systems.

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Recovery of phosphorus as struvite from the dewatered liquor through crystallization using seawater as magnesium source

Cited by 2 publications

References 33 publications

Nutrient Recovery via Struvite Precipitation from Wastewater Treatment Plants: Influence of Operating Parameters, Coexisting Ions, and Seeding

Nutrient Recovery via Struvite Precipitation from Wastewater Treatment Plants: Influence of Operating Parameters, Coexisting Ions, and Seeding

Review on Phosphorus Recovery as Struvite from Wastewater

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