Advantages obtained through the elimination of chemical products in the pre-treatment process of large desalination plants for the control of fouling, biofouling and scaling in reverse osmosis membranes

2013 ◽  
Vol 51 (7-9) ◽  
pp. 1817-1830 ◽  
Author(s):  
A. Muñoz Elguera ◽  
S.O. Pérez-Báez ◽  
A. Gómez-Gotor
Keyword(s):  
Reverse Osmosis ◽  
Treatment Process ◽  
Chemical Products ◽  
Pre Treatment ◽  
Desalination Plants ◽  
Reverse Osmosis Membranes

scholarly journals Optimization of Energy Efficiency, Operation Costs, Carbon Footprint and Ecological Footprint with Reverse Osmosis Membranes in Seawater Desalination Plants

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 781
Author(s):  
Federico Leon ◽  
Alejandro Ramos ◽  
S. Ovidio Perez-Baez
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Reverse Osmosis ◽  
Ecological Footprint ◽  
Energy Savings ◽  
Seawater Desalination ◽  
Operation Costs ◽  
Private And Public ◽  
Desalination Plants ◽  
Reverse Osmosis Membranes

This article shows the optimization of the reverse osmosis process in seawater desalination plants, taking the example of the Canary Islands, where there are more than 320 units of different sizes, both private and public. The objective is to improve the energy efficiency of the system in order to save on operation costs as well as reduce the carbon and ecological footprints. Reverse osmosis membranes with higher surface area have lower energy consumption, as well as energy recovery systems to recover the brine pressure and introduce it in the system. Accounting for the operation, maintenance and handling of the membranes is also important in energy savings, in order to improve the energy efficiency. The energy consumption depends on the permeate water quality required and the model of the reverse osmosis membrane installed in the seawater desalination plant, as it is shown in this study.

Effects of the pre-treatment alternatives on the treatment of oil-gas field produced water by nanofiltration and reverse osmosis membranes

2013 ◽  
Vol 88 (8) ◽  
pp. 1576-1583 ◽  
Author(s):  
Hale Ozgun ◽  
Mustafa Evren Ersahin ◽  
Selime Erdem ◽  
Burcu Atay ◽  
Borte Kose ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Produced Water ◽  
Gas Field ◽  
Pre Treatment ◽  
Treatment Alternatives ◽  
Oil Gas ◽  
Reverse Osmosis Membranes

Study of fouling in two-stage reverse osmosis desalination unit operating without an inlet pH adjustment: diagnosis and implications

2017 ◽  
Vol 17 (6) ◽  
pp. 1682-1693 ◽  
Author(s):  
Khaled Touati ◽  
Mehdi Hila ◽  
Kalthoum Makhlouf ◽  
Hamza Elfil
Keyword(s):  
Reverse Osmosis ◽  
Treatment Process ◽  
Membrane Surface ◽  
Periodic Acid ◽  
Feed Water ◽  
Kaolinite Clay ◽  
Ph Adjustment ◽  
Second Stage ◽  
Pre Treatment ◽  
Reverse Osmosis Desalination

Abstract In the current work, the diagnosis of a reverse osmosis desalination unit is reported. Over the two last decades, the studied desalination unit was supplying a 1,200 bed hotel. The feed water was driven from a well near the sea. The desalination unit has two stages giving an average recovery equal to 81%. The behaviour of all water streams with respect to aggressiveness and scaling tendency was assessed. The second stage reject water was shown to exhibit a very high scaling behaviour with an instantaneous precipitation in the absence of feed water pH adjustment. The analyses have shown that the produced water was very aggressive. The second stage module autopsy has revealed a sharp decrease in the membrane performances because of mineral as well as organic fouling. The inorganic scale was essentially made of coesite, calcite and kaolinite clay. The presence of silica and clay was attributed to an inadequate pre-treatment process, whereas the presence of calcite crystals at the membrane surface reveals that the chemical inhibition performed at the pre-treatment process without adjusting the pH was not able to prevent calcium carbonate precipitation. A periodic acid wash of the second stage membranes is then necessary to guarantee the desired objectives of this stage.

Assessment of ultrafiltration as a pretreatment of reverse osmosis membranes for surface seawater desalination

2003 ◽  
Vol 3 (5-6) ◽  
pp. 437-445 ◽  
Author(s):  
A. Brehant ◽  
V. Bonnelye ◽  
M. Perez
Keyword(s):  
Reverse Osmosis ◽  
Low Dose ◽  
Operating Conditions ◽  
Surface Seawater ◽  
Seawater Desalination ◽  
Dead End ◽  
Pre Treatment ◽  
Desalination Plants ◽  
The Impact ◽  
Variable Quality

Pre-treatment of seawater feeding reverse osmosis (RO) membranes is a key step in designing desalination plants, especially when treating surface seawater with highly variable quality. The objective of the study was to assess the potential of ultrafiltration (UF) pre-treatment prior to RO for desalting seawater with high-fouling tendency. A UF pilot plant equipped with an Aquasource membrane was directly operated on Gibraltar surface seawater in dead-end mode. The competitiveness of UF pre-treatment towards conventional pre-treatment was assessed by looking at the impact on RO hydraulic performances. The study showed that UF provided permeate water with higher quality than with a conventional pre-treatment. The main seawater compounds responsible for UF fouling were organic matter released by phytoplanktonic organisms. The combination of UF with a pre-coagulation at low dose helped in controlling this fouling and providing water in steady state conditions. The performance of RO membranes downstream of UF exceeded the usual operating conditions encountered in seawater desalination. The combined effect of higher recovery and higher flux rate promises to significantly reduce the RO plant costs.

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