Recirculating Aquaculture System
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Zhongshan eWater Aquaculture Equipment Technology Limited has many years rich experience in manufacturing Energy Saving RAS Fishing Farming Equipment, Ras Fish, Ras Recirculating Aquaculture Systems for Kio / climbing perch. Technology is usually adopted for the design and manufacturing of the product.With regard to its serviceability and practicality,Energy Saving RAS Fishing Farming Equipment, Ras Fish, Ras Recirculating Aquaculture Systems for Kio / climbing perch can be commonly seen in the field(s) of Other Aquaculture Equipment. Having collected customers' needs and analyzed trends, we have spent a lot in developing new and versatile features of Other Aquaculture Equipment in innovative ways.And the recirculating aquaculture system and aquaculture equipment is designed to be unique and attractive enough to catch people's attention.

Place of Origin:Guangdong, ChinaBrand Name:eWater, eWater
Model Number:EW-RASProduct name:Ras Recirculating Aquaculture Systems
Water Volume:60m3/100m3/200m3/300m3 and moreFish Species:Tilapia/Catfish/Sturgeon/Shrimp/Seabass and more
Water:Fresh water or salt waterApplication:Indoor Fish Farming water treatment
Main Equipment:Drum Filter/Protein Skimmer/Biofilter/Degassing and moreCustomize Available:Solution for all kinds of fish species and capacity
Factory Visit:AvailableUse:Indoor Aquaculture Fish Farming


RASDescription
RecirculatingaquaculturesystemRASareusedinhomeaquariaandforfishproductionwherewaterexchangeislimitedandtheuseofbiofiltrationisrequiredtoreduceammoniatoxicity.Othertypesoffiltrationandenvironmentalcontrolareoftenalsonecessarytomaintaincleanwaterandprovideasuitablehabitatforfish.ThemainbenefitofRASistheabilitytoreducetheneedforfresh,cleanwaterwhilestillmaintainingahealthyenvironmentforfish.RAShavehighfishstockingdensitiesandcanbeoperatedeconomicallycommercial.AlloureWaterresearchersarecurrentlyconductingstudiesinRASandwehavemanysuccessfulindoorfishfarmingprojectsallovertheworld.

MaineWaterRASprocessesandtheequipmentnecessaryAseriesoftreatmentprocessesisutilizedtomaintainwaterqualityinintensivefishfarmingoperations.Thesestepsareoftendoneinorderorsometimesintandem.Afterleavingthevesselholdingfishthewaterisfirsttreatedforsolidsbeforeenteringabiofiltertoconvertammonia,nextdegassingandoxygenationoccur,oftenfollowedbyheating/coolingandsterilization.Eachoftheseprocessescanbecompletedbyusingavarietyofdifferentmethodsandequipment,butregardlessallmusttakeplacetoensureahealthyenvironmentthatmaximizesfishgrowthandhealth. 

ProcessEquipmentnecessaryBiolfiltrationdenitrifyingbiofilter,MBBRprocessSolidsremovaldrumfilter,sandfilter,proteinskimmerReoxgenatingoxygenconeorlowpressureoxygenatingdevicePHcontroldegassingdeviceTemperaturecontrolsubmergedheaters,heatpumps,chillers,andheatexchangersBiosecurityUVsterilizer,ozonegenerator
Biofiltration
AllRASreliesonbiofiltrationtoconvertammonia(NH4+andNH3)excretedbythefishintonitrate.Nitrifyingbacteriaarechemoautotrophsthatconvertammoniaintonitritethennitrate.Abiofilterprovidesasubstrateforthebacterialcommunity,whichresultsinthickbiofilmgrowingwithinthefilter.Waterispumpedthroughthefilter,andammoniaisutilizedbythebacteriaforenergy.Nitrateislesstoxicthanammonia(>100mg/L),andcanberemovedbyadenitrifyingbiofilterorbywaterreplacement.
SolidsRemovalInadditiontotreatingtheliquidwasteexcretedbyfishthesolidwastemustalsobetreated,thisisdonebyconcentratingandflushingthesolidsoutofthesystem.Removingsolidsreducesbacteriagrowth,oxygendemand,andtheproliferationofdisease.TypicalRASsolidsremovalinvolvesasandfilterorparticlefilter.AnothercommonmethodistheuseofamechanicaldrumfilterInordertoremoveextremelyfineparticlesorcolloidalsolidsaproteinfractionatormaybeusedwithorwithouttheadditionofozone(O3).
PHControl
InallRASpHmustbecarefullymonitoredandcontrolled.ThefirststepofnitrificationinthebiofilterconsumesalkalinityandlowersthepHofthesystem.KeepingthepHinasuitablerangeiscrucialtomaintainthehealthofboththefishandbiofilter.pHistypicallycontrolledbytheadditionofalkalinityintheformoflime(CaCO3)orsodiumhydroxide(NaOH).pHcanalsobecontrolledbydegassingCO2inapackedcolumnorwithanaerator,thisisnecessaryinintensivesystemsespeciallywhereoxygenationinsteadofaerationisusedintankstomaintainO2levels.
TemperatureControlAllfishspecieshaveapreferredtemperatureaboveandbelowwhichthatfishwillexperiencenegativehealtheffectsandeventuallydeath.Temperaturealsoplaysanimportantroleindissolvedoxygen(DO)concentrations,withhigherwatertemperatureshavinglowervaluesforDOsaturation.Temperatureiscontrolledthroughtheuseofsubmergedheaters,heatpumps,chillers,andheatexchangers.[13]Allfourmaybeusedtokeepasystemoperatingattheoptimaltemperatureformaximizingfishproduction.
Biosecurity
DiseaseoutbreaksoccurmorereadilywhendealingwiththehighfishstockingdensitiestypicallyemployedinintensiveRAS.Outbreakscanbereducedbyoperatingmultipleindependentsystemswiththesamebuildingandisolatingwatertowatercontactbetweensystemsbycleaningequipmentandpersonnelthatmovebetweensystems.AlsotheuseofaUltraViolet(UV)orozonewatertreatmentsystemreducesthenumberoffreefloatingvirusandbacteriainthesystemwater.Thesetreatmentsystemsreducethediseaseloadingthatoccursonstressedfishandthusreducethechanceofanoutbreak.

DetailsImages
RASApplicationApplicationsTheRASisahighdensityindooraquaculturesystemandthefishspeciesofeWaterRASsuccessfulapplicationsincludingtheMandarinfish,Spottedbass,TurbotFish,Lobster,Vannamei,Kinggrouper,Tilapiaandsoon.


SuccessfulCases

Bagda(TigerShrimp)

●CulturingCycleTime:90Dto55-65gramssizeforharvesting

●Biomass:10kilograms/m3atharvesting 
●Temp:20–30℃,26–30℃preferred

Shing(StingingCatfish)HeteropneustesFossilis●CulturingCycleTime:140-160Dto65-80gramssizeforharvesting
●Biomass:80kilograms/m3atharvesting
●Temp:20–30℃,23–28℃preferred

Kio(ClimbingPerch)●CulturingCycleTime:150Dto250gramssizefor 

harvesting
●Biomass:100kilograms/m3atharvesting
●Temp:25-30℃

AnguillaAnguilla●CulturingCycleTime:150Dto150gramssizefrom

50-gramfingerlings

●Biomass:60kilograms/m3atharvesting
●Temp:26-30℃

RASusedtogrowPabdainBangladeshFarmingcycletime:120days(fingerlingsto80gramsfor
harvesting)
Biomass(stockdensity):80kg/m³
RASwatervolume:285m³
RASwaterflow:240m³/hour

RASusedtogrowTilapiainJordanThreetanksforgrow-outandonetankforharvesting
Watervolume:1182m³
12smalltanksforfingerlingsnursery,eachtank36m³
Biomass(stockdensity)atharvesting:100kg/m³
RASwaterflow:1000m³/hour

AbouteWater
Companyprofile
ZhongshaneWaterAquacultureEquipmentTechnologyLimitedisaprofessionalcompanyengagedindesign,productionandsalesofRecirculatingAquacultureSystemaswellasaquacultureequipment.Ewaterisfocusedonthedevelopmentandmanufacturingofindustrialrecirculatingaquaculturesystemsolutions,anditsproductdesignandproduction,includingdrumfilters,proteinskimmers,biologicalfilters,aerationequipment,disinfectionequipment,heatpumpsandwaterqualitymonitorequipment.


Weworkwithtop-levelaquacultureresearchinstitutesandexpertstodevelopbestsolutionsforourcustomers inaquacultrureindustry.OurengineeringteamiscommittedtodevelopbestpracticesforeachequipmentandRASbasedoncustomers'needs.Wecontinuetobereliableandhonestinwhatwedoandhowweact.

Our missionistoimprovesustainabilityandprofitabilityforcustomers,andbeavaluablepartnerforcustomers'long-termbusiness.

Certifications
ExhibitionExhibitioninNanningCityGuangxiProvince,ChinaExhibitioninZhanjiangCityGuangdongProvince,ChinaInstallationServices
Wealsoprovideon-siteinstallationservicesforourcustomers.

GreatServiceisOurMisson!

1. Warranty:12monthssincetheshippingdate,freemaintenanceprovided.Costofthesparepartsshouldbepaidbeyondthewarranty.Thefollowingconditionsarenotcoveredbythewarranty.
a)Damagedduetoaccidentormisuse.
b)Damagedbyunauthorizeddismantlingorrepairingwithoutpermission.
c)Appearancedamage
d)Replacethesparepartswiththeunauthorizedones
2. Formorespareparts(ozonetube,solenoidvalve,aircompressor,PCB)oranyotherneedsforafter-salesservicepleasecontactusviaemailorphone.


UzbekistanCarpHatcheryRASsystemproject

BangladeshShingGrow-outRASsystemproject


CustomerPhotosYouarewelcometovisitourfactory.
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Our mission is to improve sustainability and profitability for customers, and be a valuable partner for customers’ long-term business.

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They are now widely exporting to 200 countries.

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