This paper will show the most relevant aspects in the 7 year operation period in the management of the O&M (operation and maintenance) at a BWRO (brackish water reverse osmosis) plant at Cuevas de Almanzora, Almeria, Spain. This plant has a current capacity of water production of 25,000 m3/d and it was built to supplying agricultural consumers in the proximity of the plant. Cuevas de Almanzora BWRO plant is an exceptional plant in many aspects: 1) It is a plant working with brackish water but it was designed to be able to working with seawater with regards to materials, qualities and pressures (except the high pressure pump), and it could even be converted easily into a seawater plant; 2) Extensive hydrogeological studies have been completed allowing the control of aquifer exploitation and water extraction in the seawater-brackish water interface; 3) Water is distributed to different agricultural users with different water quality requirements (it produces "a la carte" water); 4) RO trains include inter stage energy recovery device to improve the hydraulic equilibrium between stages and reducing the energy consumption. This paper will present the following aspects: BWRO plant description; Results of the aquifer hydrogeological studies for the determination of saline intrusion. Conclusions and operation guidelines; Operation of the plant, results, operational problems arising from increasing salinity and specifically from sulphates; Description of the planned changes at the plant to allowing a possible future conversion into an SWRO plant; O&M costs.
Food security is one of the main challenges for the future.Expectations from UN indicate that it is necessary to double food production in the next years.This means that water needs will grow more than expected and the use of the non-conventional water resources will be absolutely crucial.Desalination for agriculture is almost irrelevant globally, although countries such as Spain have demonstrated that desalination can be used for supplying an agriculture based on high added value crops.In this paper we will analyze this application with the experiences and knowledge acquired in the last years, including the history of desalination for agriculture, technical and economic aspects, success stories and innovation.It is also remarkable that farmers from the Southeast of Spain (Mediterranean Coast) have established a very efficient irrigation system which is fed by a blending of water from different origins obtaining in this way a good quality water with affordable prices.In the field of innovation, 2 main projects related with agriculture will be shown; LIFE DESEACROP, which was developed to demonstrated the feasibility of the use of desalinated water for agriculture and SOS-AGUA-XXI, a 6
Desalination in Spain has a long story. From the early 60s many installations for drinking water supply were built, mainly in the Canary Islands. Soon it was assumed that other users would need water supply at competitive prices. Agriculture was one of them. The leap from the islands to mainland was in the 90s, when there was a substantial water shortage. In this decade, more than 200 installations were built for this application, mainly treating brackish water. More recently, the installation of large capacity plants from Spanish government programme "AGUA" would mean the end of small plants for agriculture although a discussion about the price for desalinated water arose between the government and the agricultural users. In this paper, we will describe the Spanish experience in desalination for agriculture from an historic point of view. We will also discuss the economic aspects such as the price of water obtained from desalination plants compared with other sources such as superficial or reused water as well as the percentage of water costs in agriculture production and other beneficial aspects such as increased production. With the experience gained for more than 17 years and 60 different size installations built, this paper will be illustrated with some examples where farmers have built their own desalination plants. Another interesting aspect will be to show how to do the planning for an irrigation system for agriculture based on desalination.
Water availability is the most critical component for sustaining agriculture in the Sultanate of Oman.Farmers along the coastal strip of AlBatinah region started using small desalination units to supply of good-quality irrigation water from brackish groundwater aquifers.We conducted a research project aiming to explore different aspects of the use of desalination technology for agriculture in the country.Economic and institutional constraints of desalination for agriculture in Oman were explored and compared with the leading experience of Spain.The study revealed that desalinated water in Oman is exclusively used to irrigate low-income field crops.Despite the energy subsidy in Oman, current agricultural practices and economic returns make the desalination technology an expensive option for providing irrigation water.Moreover, none of the farmers are following the regulations that outline the nature of use of small desalination units set by the Omani governmental agencies.On the contrary, there is no exclusive use of desalinated water for irrigation in Spain.Spanish farmers mix it with low-quality surface and ground water in efforts to reduce the cost of desalination.Farmers own the desalination plants and their agriculture is practiced within their organized societies to compete with local and international markets.The Spanish government has clear institutional framework that defines the use of desalination for agriculture.Given the current situation of agricultural desalination in Oman, we are suggesting considering alternative sources of water for irrigation.However, such sources will not be feasible unless agricultural practices are managed through more efficient practices of irrigation schemes.