seawater desalination driven by renewable energies: a review

DESALINATION

ELSEVIER Desalination 143 (2002) 103-l 13 www.elsevier.com/locate/desal

Seawater desalination driven by renewable energies: a review

Lourdes Garcia-Rodriguez Departamento Fisica Fundamental y Experimental, Universidad de La Laguna,

38205 La Laguna (Tenerifs), CanaT Islands, Spain Tel. +34-922-318303. Fax: +34-922- 318228; email: [email protected]

Received 21 June 2001; accepted 17 December 200 1

Abstract

This paper deals with seawater desalination systems driven by renewable energies. A review of pilot plants and perspectives of development is presented. There are many reasons why the use of renewable energies in seawater desalination is suitable, especially for remote areas where conventional energy supply and skilled workers are not usually available. Nevertheless, desalination systems driven by renewable energies are scarce and they tend to have a limited capacity.

Keyword: Seawater desalination; Renewable energies; Wind power; Solar energy

1. Introduction

The increasing use of desalination due to demographic and industrial growth makes necessary a parallel increasing of energy sources. Desalination systems driven by renewable energies are scarce, and they usually have a limited capacity. They only represent about 0.02% of total desalination capacity [l]. How- ever, many reasons make the use of renewable energies suitable for seawater desalination: l Plant location. Many arid regions are coastal

areas and renewable energy sources are available.

l Seasonal changes. Often freshwater demand

increases due to tourism, which is normally concentrated at times when the renewable energy availability is high, especially in the case of solar energy. Energy availability. Conventional energy supply is not always possible in remote areas or little islands: on the one hand because of difficulties in fossil fuel supply, and on the other because the grid does not exist or the available power is not enough to drive a desalination plant. In such cases, the use of renewable energies permits sustainable socio- economic development by using local resources.

001 l-9164/02/$- See front matter 8 2002 Elsevier Science B.V. All rights reserved PII:SOOll-9164(02)00232-l

104 L. Garcia-Rodriguez/Desalination 143 (2002) 103-I I3

Self-sufficiency. Renewable energies allow energetic diversification and avoid external dependence on energy supply. These aspects are important, especially in the least developed countries, which moreover have unstable governments. Technology. The development and commer- cialisation of desalination systems driven by renewable energies make possible technology exportation and cooperation among countries with low development. Environmental impact. Seawater desalination processes are strongly energy consuming. Therefore, the environmental effects of the fossil fuels consumed are important. Note that total world-wide capacity of desalted water is about 23 x 1 O6 m3/d [2]. Economics. On several Mediterranean islands, fresh water requirements make necessary the transport of fresh water by ship, with high costs and improper hygienic conditions. Operation and maintenance. The operation and maintenance of renewable energy systems are normally easier than conventional energy ones. Therefore, they are suitable for remote areas.

the high land requirements and investment costs of renewable energy facilities, in spite of their low operation costs. To avoid the fluctuations inherent in renewable energies, different energy storage systems may be used (see [3]).

Nowadays, several renewable energy technologies are mature enough and may be competitive with conventional energies. Some others are still under development or research.

With regard to coupling seawater desalination technologies to renewable energy systems, it is important to take into account different aspects: thermodynamic considerations (see [4,5]), speci- fic characteristics of the system location and economic evaluations. If the desalination system is going to be installed in a remote area, the technology selection may be done according to the criteria given by Abdul-Fattah [6]: simplicity, easy handling, availability, maturity of the technology, guarantee of fresh water production, suit- ability of the system to the characteristics of the location, possibility of future increase of the system capacity, efftciency, among others.

Promising commercial perspectives. The cost reduction of renewable energy systems has been significant during the last decades. Therefore, future reductions as well as the rise of fossil fuel prices could make possible the competitiveness of seawater desalination driven by renewable energies.

2. Thermal solar energy

Renewable energies are found in nature: solar

Solar energy is one of the most promising applications of renewable energies to seawater desalination, Several reviews of solar desalination have been published [ 1,7-l 01; an interesting comparison of such systems is given in [ 1 l-141, and finally references [ 15-201 deal with the present status and economics of solar desalination.

radiation, wind, energy of life beings, of the sea, A solar distillation system may consist of two or the thermal energy of the earth. Since ancient separate devices, the solar collector and the times humans have used some of these energy distiller - indirect solar desalination - or of sources, but the main development of renewable one integrated system - direct solar desalina- energy systems was due to the petroleum crisis of tion. Small production systems such as solar stills 1973. Besides that, the increasing preoccupation may be used wherever fresh water demand is low about the environment has increased the use of and land is inexpensive. High fresh water renewable energies. Nevertheless, their main demands require industrial-capacity systems. limitations are their space and temporal changes, These systems consist in a conventional seawater

L. Garcia-Rodriguez /Desalination 143 (2002) 103-I 13 105

distillation plant coupled to a thermal solar authors discussed the costs of solar MED [28-3 l] system. and MSF [ 18,321 desalination.

Many small systems of direct solar desalination and several pilot plants of indirect solar desalination have been designed and implemented [8,21-231. Table 1 shows indirect solar desalination pilots. A multi-stage flash (MSF) or a multi-effect distillation (MED) plant may be selected for solar thermal desalination. MSF is the most mature technology. Nevertheless, Massarani and Fusetti [24] proposed techno- logical improvements and Sommariva et al. [25] analysed an innovative configuration for MSF desalination. Nevertheless, MED has greater potential than MSF for designs with high performance ratio [26] and, moreover, MED processes appear to be less sensitive to corrosion and scaling than the MSF process [27]. Several

A few parabolic trough collector desalination plants have been implemented and tested [8]. At the Plataforma Solar de Almeria (PSA), Spain [22], a parabolic trough solar field was connected to a MED plant. At the second phase of the project, a double-effect absorption heat pump was coupled to the solar desalination plant. Several authors have studied the coupling of heat pumps and the design of new solar heat pumps: Slesarenko [33], Gunzbourg et al. [34] and Hulin et al. [35].

Solar flat-plate collectors had been used in a few solar desalination pilot plants [8, 211. With regard to evacuated tube collectors, El-Nashar [44] and Madam [36] reported solar desalination experiences using the MED process.

Table 1 Solar distillation plants

Plant location Desalination process m3/d Solar collectors

La Desired Island, French Caribbean [36] ME, 14 effects 40

Abu Dhabi, UAE [21] Kuwait [S]

Kuwait [8,23] La Paz, Mexico [8,23] Arabian Gulf [S] Al-Ain, UAE [37] Takami Island, Japan [S] Margarita de Savoya, Italy [S] El Paso, Texas [23] Berken, Germany [38] Lampedusa Island, Italy [39] Islands of Cape Verde [40] University of Ancona, Italy [41] PSA, Almeria, Spain [23,42] Gran Canaria, Spain [43] Area of Hzag, Tunisia [23] Safat, Kuwait [23] Near Dead Sea [23]

ME, 18 effects MSF RO MSF auto-regulated MSF, 10 stages ME ME, 55 stages; MSF, 75 stages ME, 16 effects MSF MSF MSF MSF Atlantis “Autoflash” ME, TC ME, heat pump MSF Distillation MSF MED

120 25 20

100 10

6000 500

16 50-60 19 20

0.3 300

30 72 10

0.1-0.35 10

Evacuated tube Evacuated tube Solar electricity generation

system Parabolic trough Flat plate + parabolic trough Parabolic trough Parabolic trough Flat plate Solar pond Solar pond -

Low concentration Solar pond Solar pond Parabolic trough Low concentration Solar collector Solar collector Solar pond

106 L. Garcia-Rodriguez /Desalination 143 (2002) 103-I I3

On the other hand, different plants have been implemented coupling a solar pond to a MSF [40] or a MED plant [41]. In solar distillation plants, the seawater or brine preheated by the distillation plant absorbs the thermal energy delivered by the heat storage zone of the solar pond. In addition, the thermal energy delivered by a salinity-gradient solar pond has been used, not only in seawater distillation plants, but also in seawater and brackish water reverse osmosis (RO) desalination [45]. Lu et al. [46] described a solar-pond- powered desalination plant at El Paso (USA). The solar pond drives both a thermal desalination and RO plants. Since the standard MSF process is not able to operate coupled to any variable heat source, the Atlantis Company developed an adapted MSF system called “Autoflash”. It can be connected to a solar pond [40]. Tleimat and Howe [47] analysed a MED plant driven by thermal energy delivered by a solar pond. Safi and Korchani [48] analysed the cost of dual plants connected to a solar pond. In addition, several authors [49,50] have selected solar-pond-powered desalination as one of the most cost-effective systems.

Finally, Rajvanshi [5 l] has designed a special solar collector to be connected to a MSF distillation plant. Hermann et al. [52] reported the design and test of a corrosion-free solar collector for driving ME humidification. The pilot plant was installed at Pozo Izquierdo (Gran Canaria, Spain) [53].

With regard to direct solar desalination Fath [54] gives a valuable review. In most cases, such systems consist of a solar still or a compact desalination collector (CDC). Le Goff et al. [55] give different designs for a CDC, and Boeher [56] presented a “high-efficiency water distillation of humid air with heat recovery” with a capacity range of 2-20 m3/d. On the other hand, the distillation temperature in a solar still may be increased by the connection of a flat-plate collector field [57-591. Other interesting designs

of direct solar desalination systems are given in references [60-65].

Solar electricity generation may be also used for seawater desalination. A solar-assisted freez- ing plant was installed at Yanbu, Saudi Arabia, as part of the SOLERAS project [66]. The solar collector field consists in 380 point-focusing collectors with two axes for sun tracking [66].

Furthermore, the shaft power from thermal solar energy may drive a RO process or mechanic vapour compression. A prototype of a RO plant was implemented with flat-plate collectors with freon as the working fluid [5]. Childs et al. [67] presented a system designed for the connection of a thermal solar collector to a RO plant.

3. Solar photovoltaic energy

Solar energy may be directly converted into electricity by photovoltaic conversion. Photo- voltaic cells usually consist of silicon though other semiconductors may be used. There are technologies for thin and thick film. In industrial production, efficiencies of 13-15% may be reached on monocrystalline silicon cells and 1 O- 11% on polycrystalline silicon cells. The latter are less expensive than the former. There are also amorphous silicon cells, which are thin-film cells. Efficiencies between 18% and 24% have been reached with monocrystalline and polycrystalline silicon technologies. In cells of GaAs and its alloys, as GaInP,, efficiencies higher than 30% (ultrahigh-efficiency) have been reached [W.

The main points in research of photovoltaic cells are the increase in efficiency, the reduction of manufacturing costs and the search for other materials as GaAs, CdS, CdTe and CuInSe, (CIS). CIS is sensible to the part of the red and infrared spectrum that the amorphous silicon does not absorb. On the other hand, CIS offers other interesting possibilities [69].

L. Garcia-Rodriguez /Desalination 143 (2002) 103-l I3 107

Solar photovoltaic energy is a mature technology, whose main problem is its high cost. This technology has been developed largely using stand-alone systems. The connection of photovoltaic cells to membrane processes in desalination could be an interesting alternative in remote areas. Nevertheless, RO presents significant requirements for chemicals, spare parts and skilled workers. In remote areas, the eletrodialysis process is most suitable for brackish water desalination because it is more robust and its operation and maintenance are simpler than in the case of RO.

Photovoltaic technology connected to a RO system is currently commercial. The distance at which the photovoltaic energy is competitive with conventional energy depends on the plant capacity, the distance to the electric grid and the

Table 2 Reverse osmosis plants driven by photovoltaic cells

salt concentration of the feed. With regard to solar desalination facilities, Table 2 shows the values for RO-photovoltaic plants.

Several pilot plants using electrodialysis systems connected to photovoltaic cells by means of batteries have been implemented. One of them was installed at the Spencer Valley, near Gallup (New Mexico). It was developed by the US Bureau of Reclamation [23,70]. Some others were installed at [23]: l Thar desert, India (1 m3/d, brackish water); l Ohsima Island, Nagasaki (10 m3/d, sea water);

Fukue city, Nagasaki (8.33 m3/h, brackish water); l Spencer Valley, New Mexico, USA (2.8 m3/d,

brackish water) The use of a hybrid wind-solar system to drive

a desalination unit is a promising alternative

Plant location Salt concentration Plant capacity Photovoltaic system

Jeddah, Saudi Arabia [8,23] Conception de1 Oro, Mexico [8] North of Jawa [8] Red Sea, Egypt [23,70]

Has&Khebi, Argelie [23,72]

Cituis West, Jawa, Indonesia [23] Perth, Australia [23] Wan00 Roadhouse, Australia [23] Vancouver, Canada [23] Doha, Qatar [23] Thar desert, India [23] North west of Sicily, Italy [23]

St. Lucie Inlet State Park, FL, USA [23] Lipari Island, Italy [23] Lampedusa Island, Italy [23] University of Almerla, Spain [23,71]

42800 ppm Brackish water Brackish water Brackish water

(4.4 g/l) Brackish water

(3.2 g/l) Brackish water Brackish water Brackish water Seawater Seawater Brackish water Seawater

Seawater Seawater Seawater Brackish water

3.2 m’ld 1.5 m’/d 12 m3/d 50 m’/d

0.95 m’/h

1.5 m’/h OS-O.1 m’/h -

0.5-l m’/d 5.7 m’ld 1 m’/d -

2x0.3 m’/d 2 m’/h 3+2 m’ih 2.5 m3/h

8 kW peak 2.5 kW peak 25.5 kW peak 19.84 kW peak (pump), 0.64 kW

peak (control equipment) 2.59 kWp

25 kWp 1.2 kWp 6 kWp 4.8 kWp 11.2 kWp 0.45 kWp 9.8 kWp + 30 kW diesel generator 2.7 kWp + diesel generator 63 kWp 100 kWp 23.5 kWp

108 L. Garcia-Rodriguez /Desalination 143 (2002) 103-I 13

because of the complementary characteristics of both energy sources and because many coastal areas have suitable wind and solar resources. One of such systems was designed in the frame of the SOLERAS project. Moreover, the Cadarache Centre (France) designed another unit that was installed in 1980 at Borj-Cedria, Tunisia [70]. The system consists of a 0.1 m3/d compact solar distiller, with a 0.25 m3/h RO plant and an electrodialysis plant for 4 g/l brackish water. The energetic system consists of a photovoltaic field of 4 kW peak and a wind turbine of 4 kW. Other systems have been designed and implemented [23,74] (see also [75]).

4. Wind power

Wind turbines may be classified depending on their nominal power (Pn) as very low power (Pn < 10 kW), low power (Pn < 100 kW), medium power (100 kW < Pn < 0.5 MW) and high power (Pn> 0.5 MW) [76] turbines. All are mature technologies and they are commercially available except for the high power systems, which still require several adjustments. In spite of such maturity, new control strategies may increase the output of the wind turbine [77].

Coastal areas have a high availability of wind power resources, and wind power is the most competitive renewable energy technology in power generation. Therefore, wind powered- desalination is a promising alternative.

RO is the desalination process with the lowest energy requirements. Conventional systems are designed for their connection to the grid. Other- wise, shaft power may be directly used for driving a desalination plant. The fluctuations of wind power would ruin the RO system. There- fore, an intermediate energy storage system would be necessary, but it would reduce the available energy and would increase the cost of the plant. The main drawback of RO in remote areas is the complex pre-treatment, the require-

ment of skilled workers, chemicals and membrane replacement. A preliminary cost evaluation of wind-powered RO is presented in [78].

Desalination systems driven by wind power are the most frequent renewable energy desalination plants. Some are described below.

In 1984 a wind turbine was installed at Los Moriscos (Gran Canaria, Spain) for driving a brackish water desalination plant. It is a 200 m3/d RO system. The plant is connected to the grid as auxiliary energy when the wind power is not enough for plant operation. Energy consumption is 5 kWh/m3 [79].

In 1993 a wind driven seawater desalination system began operation at Pajara (Fuerteventura Island, Spain). It is a RO plant with a capacity of 56 m3/d driven by a hybrid diesel-wind system. It consists of two diesel engines and a wind turbine of 225 kW [80]. This hybrid system provides the energy requirements for a village of 300 people. The design and implementation of the systems were possible due to the Valoren program, the Council of Pajara, the Consorcio de Abasteci- miento de Agua of Fuerteventura and the Instituto de Energias Renovables belonging to CIEMAT (Madrid).

The Gobierno Autonomo de Canarias, as an initiative of the Consejeria de Industria y Energia, created the Centro de Investigaciones de Energia y Agua in Pozo Izquierdo (Gran Canaria). Its main purpose is the study of renewable energy-driven desalination. The first project developed consists of a RO system with a variable load [81]. They planned to study other desalination systems such as vapour compression and electrodialysis [23, 821.

In 1986 the installation of a RO osmosis plant in the Middle East began. It is a 25 m3/d plant connected to a hybrid wind-diesel system [83]. In Drepanon, Achaia, near Patras (Greece), in 1995 the operation of another wind-powered RO system began [84]. Finally, [23] presents other facilities at: l Island of Suderoog (North Sea) with 6-9 m3/d;

L. Garcia-Rodriguez / Desalination 143 (2002) 103-l I3 109

l Ile du Planier, France Pacific Islands, with tricity generation. The use of biomass on desali- 0.5 m3/h; nation is not, in general, a promising alternative

l Island of Helgoland, Germany (2x480 m3/h); since organic residues are not normally available l Island of St. Nicolas, West France (hybrid in arid regions. On the other hand, the growth of

wind-diesel); biomass for use in desalination is not an alter- l Island of Drenec, France (10 kW wind energy native since it needs more fresh water than

converter). expected in a desalination plant.

Although mechanic vapour compression (MVC) consumes more energy than RO, it presents fewer problems due to the fluctuations of the energy resource than RO. MVC systems are more suitable for remote areas since they are more robust, they need fewer skilled workers and fewer chemicals than RO systems. In addition, they need no membrane replacement and offer a better quality product than RO. On the other hand, in case of contaminated waters, the distillation ensures the absence of micro- organisms in the product. In Borkum Island in the North Sea, one such plant was implemented with fresh water production of about 0.3-2 m3/h [23, 851. In Ruegen Island (Germany) another one with a 300 kW wind energy converter and 120-300 m3/d of fresh water production was installed [23]. In addition, there is a commercial 300 m3/d plant [5].

6. Geothermal energy

There are different geothermal energy sources. They may be classified in terms of the measured temperature as low, medium and high. The corresponding thresholds are lower than 1 OO”C, between 100°C and 15O”C, and up to 1 50°C, respectively. The thermal gradient in the earth varies between 15°C and 75°C per km depth. Nevertheless, heat flux is anomalous in different continental areas. Moreover, there are local centres of heat between 6 and 10 km deep due to disintegration of radioactive elements.

Finally, the electrodialysis process is interesting for brackish water desalination; such desalination systems driven by wind power are more suitable for remote areas than RO plants.

The use of magma and of geo-pressurised energy is under research. In addition, the geothermal energy of hot rocks requires several adjustments. Nevertheless, the binary hydro- geothermal cycles are more developed than the ones mentioned above. It has to be said that electricity generation by geothermal energy is a mature and competitive technology.

5. Biomass

Biomass is any type of organic matter whose origin is a biologic process. It may be used by direct combustion or by transformation on bio- fuels (e.g., methanol, ethanol, hydrogen, oils).

Nowadays, the direct combustion of biomass is commercial. Where many biomass residues are available, it is possible to drive a distillation process or to drive other desalination processes by using thermo-mechanic conversion or elec-

The main advantage of geothermal energy is that the thermal storage is unnecessary in such systems. In 1996,7 173.5 MW, were generated by geothermal energy, and in 1994,8664 MW, were consumed on other applications [86]. Between these applications the space heating is important, especially in Iceland where the 99% of the buildings in its capital are heated in this way [87]. For instance, in Italy, direct uses of geothermal heat consist of space- and district- heating, greenhouse heating, fish farming and some industrial applications. Excluding bathing and swimming, the total installed capacity is about 340 MW, [88].

110 L. Garcia-Rodriguez /Desalination 143 (2002) 103-I 13

Geothermal waters in the upper 100 m may be a reasonable alternative to desalination [5] (see also [89]). Karytsas [90] developed a technical and economic analysis for the use of geothermal sources between 75OC and 90°C on MED. One such plant will be installed in Cyclades Islands (Greece). Besides that, El Amali et al. [91] proposed an application to membrane distillation. On the other hand, a high-pressure source allows the direct use of shaft power on desalination. Moreover, thermal energy conversions on shaft power or electricity would permit the connection with other desalination systems.

7. Ocean energy

Ocean energy is expressed in many ways, e.g., waves energy, tides and thermal gradient of the sea. The nominal power is 0.5,240 and 40 MW,, respectively [75]. Nowadays, there are very few facilities of wave and tide energy conversion to electricity (see [ 11).

The use of ocean energy for seawater desalination in not currently practical because wave energy is not yet commercial, tide energy is expensive, and the energy of the oceanic thermal gradient is still under research. Rabas and Panchal [92] described an MSF desalination system coupled to thermal ocean energy. The studies of Crear and Pritchard [93] showed that desalination using wave energy would be eco- nomically viable for capacities of lo6 m3/d. In addition, Heath [94] proposed a wind-wave hybrid system connected to a distiller. The advantages of such a system would be the availability of a more regular energy source than wind power.

8. Conclusions

The brief review of desalination powered by renewable energies presented in this paper shows

the status of development reached by such technology. A variety of systems was described and their very different maturities were pointed out.

Acknowledgements

This study was supported financially by the Canary Autonomous Government (project PI2000/13 6) and La Laguna University.

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