Desalination method of supersaturated hot water

Abstract

The present invention relates to a method for the desalination of supersaturated hot water at a temperature between 40°C and 80°C, comprising contacting said hot water with a reverse osmosis membrane resistant to temperatures between 40°C and 80°C, without a prior cooling step.

Description

technical field [0001] The object of the present invention is the desalination method of supersaturated hot water using reverse osmosis. Background technique [0002] Reverse osmosis is one of the most common methods of preparing drinking water from surface or ground water, especially from saline seawater. [0003] There are therefore various installations for treating these supersaturated hot waters using reverse osmosis, especially in Saudi Arabia. These devices have hitherto been designed according to the following sequence of steps: [0004] 1. Pumping in the submerged layer, [0005] 2. Cooling through the ventilation cooling device to reduce the water temperature to an acceptable level for the reverse osmosis membrane, [0006] 3. Optionally incorporating supplementary steps of decarbonation and / or softening and / or desiliconization and / or iron removal to increase reverse osmosis efficiency, [0007] 4. Then, a filtration step in one or two stages to trap the finer ...

AI Technical Summary

Problems solved by technology

[0022] 1. The weight of the structure increases, which is the most serious consequence; the structure can even break if it is not cleaned in time

This periodic cleaning reduces system availability

[0023] 2. Loss of cooling efficiency, which may necessitate reducing the flow rate of the equipment

[0025] 1. Blockage of movable devices (such as valves, pumps),

[0026] 2. Agglomeration of the filter material, which impairs its filtering capacity and its daily self-cleaning, and

[0027] 3. Accumulation of clogging substances, which reduces the cycle duration and degrades the water quality of the water directed to the reverse osmosis unit

[0031] 1. Risk of large precipitation of iron and calcium carbonate in cooling towers and subsequent filtration steps,

[0032] 2. Loss of tower cooling efficiency due to accumulated sediment,

[0033] 3. The maintenance frequency of cooling towers is greatly increased, which leads to accelerated wear and loss of availability.

[0034] 4. If maintenance is not carried out in time, there is a risk of mechanical damage to the cooling tower,

[0035] 5. The performance loss of the filtration step due to the accumulation of sediment during the circulation process,

[0036] 6. The risk of filter medium caking, filter valve clogging and filter sensor clogging and deactivation,

[0037] 7. Increased sludge risk from reverse osmosis membranes, and

[0038] 8. High cost of reagents used to limit or eliminate precipitation

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