Aquifer Treatment of Sea Water to Remove Natural Organic Matter Before Desalination

Dehwah, Abdullah H.A.; Al-Mashharawi, Samir; Ng, Kim Choon; Missimer, Thomas M.

doi:10.1111/gwat.12476

Cited by 10 publications

(1 citation statement)

References 35 publications

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“…While it is unlikely that membrane biofouling can ever be eliminated, the rate of biofouling can be controlled by using extensive pretreatment processes [4,5] designed to remove inorganic and organic particulates including algae, fineorganic solids, and bacteria; and semi-dissolved or dissolved organic matter, such as particulate and colloidal transparent exopolymer particles (TEP) and other sticky polysaccharides that occur mostly within the biopolymer fraction of natural organic matter (NOM) [6]. Many of the precursors to biofouling are also known to be effectively removed by using subsurface intakes, such as conventional vertical wells [7][8][9][10][11] and seabed galleries [12,13].…”

Section: Introductionmentioning

confidence: 99%

Impacts of natural pore-water and offshore aquifer chemistry on the operation and economics of some subsurface intakes types for SWRO plants

Missimer¹,

Watson²,

Maliva³

et al. 2018

Desalination and Water Treatment

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CitationMissimer TM, Watson I, Maliva RG, Ghaffour N, Dehwah AAH, et al. (2018) Impacts of natural pore-water and offshore aquifer chemistry on the operation and economics of some subsurface intakes types for SWRO plants. DESALINATION AND WATER TREATMENT 132: 1-9. Available: http://dx. AbstractHorizontal and slant wells are being investigated as a means of obtaining feed water for seawater reverse osmosis (SWRO) desalination plants. These well types have been touted to produce higher quality seawater that will reduce the rate of membrane biofouling by removing algae, bacteria, transparent exopolymer particles, and other fractions of natural organic matter similar to onshore wells located on the beach. As these new well types are being considered for large-scale use, a careful evaluation of the biogeochemistry of seawater that occurs within the nearshore subsurface sediments is necessary to assess potential impacts to the SWRO process train. A high percentage of the coastlines of the world contain offshore sediments with seawater that is anoxic in nature with significant concentrations of hydrogen sulfide and dissolved organic matter, iron, manganese, and heavy metals. Where dissolved iron and/or manganese occur at concentrations greater than 1 mg/L in raw seawater, there can be problematical for direct treatment using the SWRO process. Membrane scaling and biofouling could become issues, which may necessitate pretreatment to reduce dissolved iron and manganese to acceptable concentrations prior to entry into the membrane process. The anoxic nature of the water could complicate the pretreatment process to remove the dissolved metals. Pretreatment requirements could significantly raise the capital and operational costs of SWRO negating the economic advantages of subsurface intakes. Six SWRO cost scenarios were evaluated to assess the impacts of slant wells on capital and operating costs based on the necessary to remove or not remove dissolved iron and manganese. The capital cost comparison of two open-ocean intake pretreatment systems to those in slant wells shows an increase of 6 to 20%. The difference in operating costs can range from 19% lower to 15% higher depending on the pretreatment required.

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Section: Introductionmentioning

confidence: 99%

Impacts of natural pore-water and offshore aquifer chemistry on the operation and economics of some subsurface intakes types for SWRO plants

Missimer¹,

Watson²,

Maliva³

et al. 2018

Desalination and Water Treatment

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Green method of stemming the tide of invasive marine and freshwater organisms by natural filtration of shipping ballast water

Kumar

Ragumaran

Nandagopal

et al. 2020

Environ Sci Pollut Res

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Marine and freshwater pollution caused by transport of invasive species in shipping ballast water is a major global problem and will increase in magnitude as shipping of commodities increases in the future. An economical method to preclude biological organisms in the seawater used for ballast is to exclude them at the source port. Integrated natural filtration using onshore wells or seabed gallery systems has been thoroughly investigated for use as pretreatment for seawater desalination systems and has proven to be environmentally acceptable and economic. Thus, the use of this proven filtration technology to another issue, ballast water treatment, is an innovative method of providing marine organism free seawater by non-destructive means in port-based facilities. This method is ecosystem-friendly in that no chemicals or destructive processes are used. Design and construction of well or seabed gallery intake systems for production of ballast seawater are feasible in virtually all global port facilities.

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Controlling harmful algal blooms (HABs) by coagulation-flocculation-sedimentation using liquid ferrate and clay

et al. 2021

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Aquifer Treatment of Sea Water to Remove Natural Organic Matter Before Desalination

Cited by 10 publications

References 35 publications

Impacts of natural pore-water and offshore aquifer chemistry on the operation and economics of some subsurface intakes types for SWRO plants

Impacts of natural pore-water and offshore aquifer chemistry on the operation and economics of some subsurface intakes types for SWRO plants

Green method of stemming the tide of invasive marine and freshwater organisms by natural filtration of shipping ballast water

Controlling harmful algal blooms (HABs) by coagulation-flocculation-sedimentation using liquid ferrate and clay

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