total hardness
total hardness
(OP)
Dear Sirs
Please your recommendation We need our final product water total hardness between 70 and 120 mg/ltr. To be use for Dairy applications( water type RO permeate)
Thank you
Please your recommendation We need our final product water total hardness between 70 and 120 mg/ltr. To be use for Dairy applications( water type RO permeate)
Thank you





RE: total hardness
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RE: total hardness
RE: total hardness
in the past we remineralization by blending with raw water but we stop that because our raw water high with chlorides and this cause corrosion to network pipe of the factory
RE: total hardness
RE: total hardness
RE: total hardness
PH: 7 - 7.5
TH: 8 - 12 degree F
TAC : 8 - 10 degree F
LSI : -0.5 to 0.5
I Hope someone advise me to achieve our goals. please note we use now NaOH and calcium hypochlorite for post treatment
Thank you
RE: total hardness
What are the other cations and anions in the water? Is this a wastewater recycle or a potable water application.
RE: total hardness
It's potable water application.
please find below our well water analysis:
ASPECT Limpide
Turbidité NTU 10.00
Température °C 43.60
Conductivité µs/cm 6,270.00
TDS mg/l 4,702.50
pH 7.01
TH °F 120.00
Ca++ °F 95.00
Mg++ °F 25.00
TA °F 0.00
TAC °F 38.00
Fer dissous mg/l 0.06
Chlorures °F 235.00
Sulfates mg/l 400.00
Silice mg/l 27.80
Nitrates mg/l 12.50
Indice de RYZNAR 5.30
Indice de LARSON 7.28
RE: total hardness
Based on that, you should be able to blend 10-15% of raw water with 85-90% RO permeate and meet your target of final product water total hardness between 70 and 120 mg/L.
The chloride will be approximately 50 mg/L. At this concentration chloride is not typically corrosive. Perhaps you have MIC, in which case you should be feeding a disinfectant (chlorine).
The RO permeate will have a pH in the 6 range. The low pH is caused by the rejection of the alkalinity while carbon dioxide passes through the RO membrane. Post treatment is necessary with an alkali to raise the pH (remove the carbon dioxide) and make the water less corrosive.
RE: total hardness
we had blending raw water with permeate before but we stopped that because we face alot of corrosion on network pipe
RE: total hardness
RE: total hardness
H2S should be removed prior to RO.
RE: total hardness
RE: total hardness
http://msdssearch.dow.com/PublishedLiteratureDOWCO...
RE: total hardness
Thank you
RE: total hardness
Without knowing more, stabilization by addition of caustic hydroxide alkalinity is the most widely used approach for desalinated permeate.
Then, you mentioned reblending. Later you mentioned hydrogen sulfide.
Without the details, it is a game of 20 questions.