Pre-treatment of supersaturated warm water

Abstract

A method for desalinating water by reverse osmosis comprising, as the first step, a desaturation step.

Description

technical field [0001] The present invention is directed to a process for desalination of hot water using reverse osmosis, including chemical pretreatment of said water prior to reverse osmosis treatment. Background technique [0002] Reverse osmosis is one of the most common methods for preparing drinking water from surface or ground water, especially from saline seawater. [0003] There are therefore various plants for treating these supersaturated hot waters with reverse osmosis, especially in Saudi Arabia. These devices have so far been designed according to the following series of steps: [0004] 1. Pump in the submersible layer, [0005] 2. Cooling by a ventilation cooling device to reduce the water temperature to an acceptable level for the reverse osmosis membrane, [0006] 3. Optionally, incorporating additional steps of decarbonation and / or softening and / or desilication and / or iron removal to increase reverse osmosis efficiency, [0007] 4. Then, a filtration s...

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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