What is the best water treatment method for water with the following given specifications to use water for Drinking and Cooling purposes? We get our water from two brackish water surface wells. Water from well 1 will be used for drinking and Water from well 2 for plant cooling purposes (closed cooling loop). Which method will give better results - Electrodialysis Reversal or Reverse Osmosis and why? Water Specification Well 1 - For Drinking water Well 2 - Plant cooling pH 7.35 7.42 conductivity [µS/c] 5290 5057 Salinity (as NaCl) [mg/L] 2138 1981 Chlorides (Cl -) [mg/L] 1453 1200 Sodium (Na+) [mg/L] 685 781 Total Hardness [F.D.] 19 15 Calcium (Ca2+) [mg/L] 40 30 Magnesium (Mg2+) [mg/L] 21 18 B.O.D [mg/L] 60 60 Carbonates (CO3-2) [mg/L] Traces Traces Bicarbonates (HCO3) [mg/L] 159 146 Suphates (SO4-2) [mg/L] 940 840 Nitrites (NO3-) [mg/L] 1.6 2.2 Nitrites (NO2-) [mg/L] 0.021 0.035 Silicate (SiO2) [mg/L] 17 15 Ammonia (NH3) [mg/L] 0.64 1 T.SUSP Solids [mg/L] 6 2 T. Dissolved Solids (T.D.S) [mg/L] 3386 3236 Turbidity [FTU] 0.004 0.01 Dissolved (Fe2+) [mg/L] 0.08 0.45 Chemicals [ppm] 0.5 0.35

TSS and Turbidity does not match, TSS probably will be much lower. Measurement of TSS for low levels is very difficult. SDI15 should give a better understanding of the quality, but probably should be lower than 1. As other people mentioned, EDR will give you a higher recovery (85-90 %) but every stage will reduce the TDS 50% average. It's very easy to calculate the number of stages you need knowing the quality you want to achieve. Two stages is ideal, three stages is the higher economical number. Advantages: No biofouling, even during standby time,Chlorine gas production (You save a lot of money in hypo to sterilize the product water) No membrane replacement in many years. Membranes are chlorine resistant. No sand filters for this water, only cartridge filters as pre treatment. RO is also a good option. Perhaps you do not need sand filters as well. It will depend on the amount of colloids. A measurement of SDI15 will give you the answer. CAPEX and OPEX data is needed to take a decision

EDR Vs RO for Water Treatment

Published on December 1, 2016 13:33 by Mahmud Zeitouni, Process Engineer في Mellitah oil&gas offshore Lybia in Technology

What is the best water treatment method for water with the following given specifications to use water for Drinking and Cooling purposes?

We get our water from two brackish water surface wells.

Water from well 1 will be used for drinking and
Water from well 2 for plant cooling purposes (closed cooling loop).

Which method will give better results - Electrodialysis Reversal or Reverse Osmosis and why?

Water Specification	Well 1 - For Drinking water	Well 2 - Plant cooling
pH	7.35	7.42
conductivity [µS/c]	5290	5057
Salinity (as NaCl) [mg/L]	2138	1981
Chlorides (Cl -) [mg/L]	1453	1200
Sodium (Na+) [mg/L]	685	781
Total Hardness [F.D.]	19	15
Calcium (Ca2+) [mg/L]	40	30
Magnesium (Mg2+) [mg/L]	21	18
B.O.D [mg/L]	60	60
Carbonates (CO3-2) [mg/L]	Traces	Traces
Bicarbonates (HCO3) [mg/L]	159	146
Suphates (SO4-2) [mg/L]	940	840
Nitrites (NO3-) [mg/L]	1.6	2.2
Nitrites (NO2-) [mg/L]	0.021	0.035
Silicate (SiO2) [mg/L]	17	15
Ammonia (NH3) [mg/L]	0.64	1
T.SUSP Solids [mg/L]	6	2
T. Dissolved Solids (T.D.S) [mg/L]	3386	3236
Turbidity [FTU]	0.004	0.01
Dissolved (Fe2+) [mg/L]	0.08	0.45
Chemicals [ppm]	0.5	0.35

Taxonomy

Treatment
Produced Water Treatment
Industrial Wastewater Treatment
RO Systems
Drinking Water Treatment
Water Treatment & Control
Industrial Water Treatment
Purification
Reverse Osmosis
Industrial Water Treatment
Water Quality
Brackish Water
Electrodialysis
Reverse Osmosis
RO & MSF Fouling
Water Supply
Drinking Water
Water Quality Monitoring
Water Treatment & Control
Cooling Systems
Water Purification
Total Dissolved Solids (TDS)