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Cairo University (2012)

Assessing Alternatives for Disposal of Reject Brine from Inland Desalination Plants

Mohamed Ezzat Abdel Mohsen

Titre : Assessing Alternatives for Disposal of Reject Brine from Inland Desalination Plants

تقييم بدائل التخلص من المياه المالحة الناتجة من محطات التحلية بالمناطق غير الساحلية

Auteur : Mohamed Ezzat Abdel Mohsen

Etablissement de soutenance : Cairo University

Grade : Master of Science (MS) 2012

Résumé
Awareness of the rapid growth in population and the fixed share Egypt gets from the Nile water has driven efforts to seek supplements to the Nile water. Atop of them is the desalination of brackish groundwater. However, it has to go in parallel with designing a disposal system for the desalination by-product (reject brine). A need thus exists for assessing the possible disposal options from the perspectives of the technical viability, effect on the environment as well as the economic feasibility. Using a case study in Central Sinai, two disposal options are evaluated. These are the use of evaporation ponds and the injection of reject brine in deep geologic units. Modeling utilizes the MODFLOW and MT3DMS codes, which are then coupled with the SEAWAT code for the simulation of the variable density groundwater flow. The simulation of the evaporation pond shows that the effect of salinity on evaporation rates can result in an increase of the pond area by about 140%. Whereas injecting the brine around the desalination plant for a period of 25 years results in an increased salinity plume that extends 250 m around the injection well and the average salinity of an estimated groundwater volume of 2.6x106 m3 increases by 164% for one of the disposal scenarios leading to an increased cost of desalination of 60% for a plant capacity of 1000 m3/day

Mots Clés : Reject brine disposal, Deep well injection, Evaporation ponds, Inland desalination plants, Brackish water, Cretaceous aquifer, Al-Monbateh

Présentation

Page publiée le 12 avril 2020