Brine utilisation for cooling and salt production in wind-driven seawater greenhouses: Design and modelling

T. Akinaga, S.C. Generalis, C. Paton, O.N. Igobo, P.A. Davies

Research output: Contribution to journalArticle

Abstract

Brine disposal is a major challenge facing the desalination industry. Discharged brines pollute the oceans and aquifers. Here is it proposed to reduce the volume of brines by means of evaporative coolers in seawater greenhouses, thus enabling the cultivation of high-value crops and production of sea salt. Unlike in typical greenhouses, only natural wind is used for ventilation, without electric fans. We present a model to predict the water evaporation, salt production, internal temperature and humidity according to ambient conditions. Predictions are presented for three case studies: (a) the Horn of Africa (Berbera) where a seawater desalination plant will be coupled to salt production; (b) Iran (Ahwaz) for management of hypersaline water from the Gotvand dam; (c) Gujarat (Ahmedabad) where natural seawater is fed to the cooling process, enhancing salt production in solar salt works. Water evaporation per face area of evaporator pad is predicted in the range 33 to 83 m3/m2·yr, and salt production up to 5.8 tonnes/m2·yr. Temperature is lowest close to the evaporator pad, increasing downwind, such that the cooling effect mostly dissipates within 15 m of the cooling pad. Depending on location, peak temperatures reduce by 8–16 °C at the hottest time of year.
Original languageEnglish
Pages (from-to)135-154
JournalDesalination
Volume426
Early online date2 Nov 2017
DOIs
Publication statusPublished - 15 Jan 2018

Fingerprint

Greenhouses
Seawater
brine
Salts
salt
Cooling
seawater
cooling
modeling
Brines
Evaporators
Desalination
evaporation
Water
Evaporation
sea salt
desalination
water
ventilation
Aquifers

Bibliographical note

© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).

Funding: Innovate UK and the Department for International Development, under the Agri-Tech Catalyst programme, project number: 102275.

Keywords

  • Brine management; Salt works; Zero liquid discharge; Greenhouse cooling; Seawater greenhouse

Cite this

Akinaga, T. ; Generalis, S.C. ; Paton, C. ; Igobo, O.N. ; Davies, P.A. / Brine utilisation for cooling and salt production in wind-driven seawater greenhouses : Design and modelling. In: Desalination. 2018 ; Vol. 426. pp. 135-154.
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Brine utilisation for cooling and salt production in wind-driven seawater greenhouses : Design and modelling. / Akinaga, T.; Generalis, S.C.; Paton, C.; Igobo, O.N.; Davies, P.A.

In: Desalination, Vol. 426, 15.01.2018, p. 135-154.

Research output: Contribution to journalArticle

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T1 - Brine utilisation for cooling and salt production in wind-driven seawater greenhouses

T2 - Design and modelling

AU - Akinaga, T.

AU - Generalis, S.C.

AU - Paton, C.

AU - Igobo, O.N.

AU - Davies, P.A.

N1 - © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). Funding: Innovate UK and the Department for International Development, under the Agri-Tech Catalyst programme, project number: 102275.

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Y1 - 2018/1/15

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