This part of the work was done inorder to examine and outline
the technical issues of the suspected membrane fouling (biofouling
or inorganic-fouling) and the interrelated effects of using different
antiscalants. Membrane autopsies were taken only from the first
desalination stage(Fig.2) during the plants’ operation and the
effect of the different antiscalants on fouling behavior of the RO
modules was tested. The feed water for Granot desalination plants
(both commercial and pilot) is a blend from five local ground
brackish water wells. Pre-treatment before the RO process includes
pH correction (to6.8) by H Claddition, rough filtration(80mesh),
cartridge filtration(5 mm) and antiscalant injection. The commercial
desalination plant has been working continuously since2004, while
the pilot plant has been working since2009. Chemical cleaningis
conducted once or twice a year in both the commercial and pilot
plants. The water chemistry Antiscalantsusedinthecommercialandthepilotdesalination
plantswerepolyphosphonateandpolyacrylatebased,respectively.
Thenominalfeed flowratetoGranotcommercialandpilotplants
was475m3 h1 and20m3 h1, respectively,andtheworking
pressurewassetatbetween12and15bar.Itshouldbementioned
thattherelevancyofthedelineatedbiofoulingmechanismsfound
so far,underlaboratorycontrolledconditions,arehighlightedwith
respecttotheseverebiofoulingobservedwhenpolyacrylate-based
antiscalantisbeingusedinthepilotplantfacility.Theeffectsof
antiscalanttypeaswellasthelocationofmembranesamplingon
theanalysisofmembraneautopsyarethoroughlydiscussedinthe
followingsections.Antiscalantsusedinthecommercialandthepilotdesalination
plantswerepolyphosphonateandpolyacrylatebased,respectively.
Thenominalfeed flowratetoGranotcommercialandpilotplants
was475m3 h1 and20m3 h1, respectively,andtheworking
pressurewassetatbetween12and15bar.Itshouldbementioned
thattherelevancyofthedelineatedbiofoulingmechanismsfound
so far,underlaboratorycontrolledconditions,arehighlightedwith
respecttotheseverebiofoulingobservedwhenpolyacrylate-based
antiscalantisbeingusedinthepilotplantfacility.Theeffectsof
antiscalanttypeaswellasthelocationofmembranesamplingon
theanalysisofmembraneautopsyarethoroughlydiscussedinthe
followingsections.of the feed water is shown
Antiscalant sused in the commercial and the pilot desalination
plants were polyphosphonate and polyacrylate based, respectively.
The nominal feed flowrate to Granot commercial and pilot plants
was 475m3 h1 and 20m3 h1, respectively, and the working
pressure was set at between12 and 15bar. Its hould be mentioned
that the relevancy of the delineated biofouling mechanisms found
so far, under laboratory controlled conditions, are highlighted with
respect to the severe biofouling observed when polyacrylate-based
antiscalant is being used in the pilot plant facility. The effects of
antiscalant type as well as the location of membrane sampling on
the analysis of membrane autopsy are thoroughly discussed in the
following sections.
This part of the work was done inorder to examine and outlinethe technical issues of the suspected membrane fouling (biofoulingor inorganic-fouling) and the interrelated effects of using differentantiscalants. Membrane autopsies were taken only from the firstdesalination stage(Fig.2) during the plants’ operation and theeffect of the different antiscalants on fouling behavior of the ROmodules was tested. The feed water for Granot desalination plants(both commercial and pilot) is a blend from five local groundbrackish water wells. Pre-treatment before the RO process includespH correction (to6.8) by H Claddition, rough filtration(80mesh),cartridge filtration(5 mm) and antiscalant injection. The commercialdesalination plant has been working continuously since2004, whilethe pilot plant has been working since2009. Chemical cleaningisconducted once or twice a year in both the commercial and pilotplants. The water chemistry Antiscalantsusedinthecommercialandthepilotdesalinationplantswerepolyphosphonateandpolyacrylatebased,respectively.Thenominalfeed flowratetoGranotcommercialandpilotplantswas475m3 h1 and20m3 h1, respectively,andtheworkingpressurewassetatbetween12and15bar.Itshouldbementionedthattherelevancyofthedelineatedbiofoulingmechanismsfoundso far,underlaboratorycontrolledconditions,arehighlightedwithrespecttotheseverebiofoulingobservedwhenpolyacrylate-basedantiscalantisbeingusedinthepilotplantfacility.Theeffectsofantiscalanttypeaswellasthelocationofmembranesamplingon
theanalysisofmembraneautopsyarethoroughlydiscussedinthe
followingsections.Antiscalantsusedinthecommercialandthepilotdesalination
plantswerepolyphosphonateandpolyacrylatebased,respectively.
Thenominalfeed flowratetoGranotcommercialandpilotplants
was475m3 h1 and20m3 h1, respectively,andtheworking
pressurewassetatbetween12and15bar.Itshouldbementioned
thattherelevancyofthedelineatedbiofoulingmechanismsfound
so far,underlaboratorycontrolledconditions,arehighlightedwith
respecttotheseverebiofoulingobservedwhenpolyacrylate-based
antiscalantisbeingusedinthepilotplantfacility.Theeffectsof
antiscalanttypeaswellasthelocationofmembranesamplingon
theanalysisofmembraneautopsyarethoroughlydiscussedinthe
followingsections.of the feed water is shown
Antiscalant sused in the commercial and the pilot desalination
plants were polyphosphonate and polyacrylate based, respectively.
The nominal feed flowrate to Granot commercial and pilot plants
was 475m3 h1 and 20m3 h1, respectively, and the working
pressure was set at between12 and 15bar. Its hould be mentioned
that the relevancy of the delineated biofouling mechanisms found
so far, under laboratory controlled conditions, are highlighted with
respect to the severe biofouling observed when polyacrylate-based
antiscalant is being used in the pilot plant facility. The effects of
antiscalant type as well as the location of membrane sampling on
the analysis of membrane autopsy are thoroughly discussed in the
following sections.
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