Use of Desalinated Reject Water as a Source of Magnesium for Phosphorus Recovery

Fattah, Kazi Parvez; Shabani, Sina; Ahmed, Aqeel

doi:10.7763/ijcea.2013.v4.286

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…Dolomite (CaMg(CO 3 ) 2 ), as well as dolomite lime (CaMg(OH) 4 ), are cheap abundant minerals that are naturally available [28]. Desalination processes to produce potable water produce reject brine, which is also considered a viable source of magnesium [29,30]. Sacrificial magnesium anodes [31,32], magnesium oxides [33], as well as cryptocrystalline magnesite [34], are also considered viable sources for magnesium.…”

Section: Literature Reviewmentioning

confidence: 99%

Impact of Magnesium Sources for Phosphate Recovery and/or Removal from Waste

et al. 2022

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As the population continues to rise, the demand for resources and environmentally friendly management of produced wastes has shown a significant increase in concern. To decrease the impact of these wastes on the environment, it is important to utilize the wastes in producing and/or recovering usable products to provide for the sustainable management of resources. One non-renewable and rapidly diminishing resource is phosphorus, which is used in several products, the most important being its use in manufacturing chemical fertilizer. With the increase in demand but reduction in availability of naturally occurring mineral phosphorus, it is important to investigate other sources of phosphorus. Phosphorus is most commonly recovered through struvite (magnesium ammonium phosphate) precipitation. The recovery of phosphorus from various wastewater has been well established and documented with recovery rates mostly above 90%. However, one of the major drawbacks of the recovery is the high cost of chemicals needed to precipitate the phosphorus. Since the external magnesium needed to achieve struvite precipitation accounts for around 75% of the total chemical cost, applicability of low-cost magnesium sources, such as bittern or seawater, can help reduce the operational cost significantly. This paper investigates the different magnesium sources that have been used for the recovery of phosphorus, highlighting the different approaches and operating conditions investigated, and their corresponding phosphorus recovery rates. An investigation of the economic aspects of the magnesium sources used for removal/recovery show that costs are dependent on the raw waste treated, the source of magnesium and the location of treatment. A review of published articles on the economics of phosphorus removal/recovery also indicates that there is a lack of studies on the economics of the treatment processes, and there is a need for a comprehensive study on life cycle assessment of such processes that go beyond the technical and economical aspects of treatment processes.

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Section: Literature Reviewmentioning

confidence: 99%

Impact of Magnesium Sources for Phosphate Recovery and/or Removal from Waste

et al. 2022

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“…Consequently, the nanofiltration brine is rich in ions, including the magnesium ion. The reject water from the desalination plant is a considerably richer and more sustainable source of magnesium than seawater, as the reject water could be a free source of magnesium that would otherwise be discharged into the ocean [20,21]. The magnesium-rich concentrate, the reject from seawater desalination, has been used to promote struvite precipitation from wastewater [22].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Use of concentrate water from seawater desalination plant as magnesium sources for struvite formation by using anaerobically digested effluent of swine wastewater

Kim

Min

et al. 2016

Desalination and Water Treatment

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Young Park (2016): Use of concentrate water from seawater desalination plant as magnesium sources for struvite formation by using anaerobically digested effluent of swine wastewater, Desalination and Water Treatment, A B S T R A C TAlthough struvite crystallization has been proven an effective process to recover nutrients from wastewater, this method has not been used widely because of the cost of the raw chemicals, such as magnesium chloride, required as supplements. In this study, in view of the high cost of supplementing magnesium, reject water from a seawater reverse osmosis process was investigated as a potential source of magnesium. The magnesium was used in the nutrient recovery process, by which struvite crystallization was performed from the anaerobically digested effluent of swine wastewater. The results of all the experiments were positive, indicating that struvite formation was successfully performed from the effluent, using the concentrate water as a magnesium source. Removal efficiencies of up to 94.5% for phosphate and 12.7% for ammonium were achieved under normal operating conditions. Seed materials were successfully used as nucleation sites to enhance the purity of the struvite and the crystal size. The removal efficiencies of phosphate and ammonia could be improved up to 97 and 84%, respectively, by adding phosphate and seed materials.

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