Good morning everybody,

I have the following wastewater that I'm trying to convert to drinking water. What treatment would you recommend?
Here is the data I have so far:

Wastewater characteristics                     Desired
pH: 7.51                                               pH: 6.5-8.5
Total Dissolved solids: 5718 mg/L           TDS: 500mg/L
Total Hardness (CaCO3): 2863 mg/L       TH: 300 mg/L
Calcium (Ca): 553 mg/L                         Ca: 75 mg/L
Magnesium (Mg): 361 mg/L                    Mg: 30 mg/L
Chloride (Cl): 3416 mg/L                       Cl: 250 mg/L
Sulphate (SO4): 790 mg/L                      SO4: 200 mg/L
Iron (Fe): 3.75 mg/L                               Fe: 0.3 mg/L
Alkalinity (CaCO3): 495 mg/L                 Alk: 200 mg/L

What process and manufacturer would you recommend to get this done?

You might want to consider:

http://www.vsep.com/

grrun

Going to continue -absorpt matieral -like resins will require regeneration and take greater chemical control/additives. You'd have to have additives post the RO to get the pH back to neutral - but that is relatively cheap and again, can be done automatically. Your discharge from the RO will have to be disposed off. What volume that is, is unknown - since your not mentioning daily volumes etc. If volume is small enough - could discharge to sewerage or even septic field. The oxidation precipitates could go to ground. Why no mention of arsenic? would think this would be present in wastewater.

vacuum evaporation

Prefiltration if required: turbo discs made by Miller-Leman. This removes down to 50 micron and can be automated for self-cleaning, etc.

Posts Electrolytic Oxidation: regen DE - made by Filter Technologies out of Michigan. Can make it's own slurry, self cleans - DE laden with oxidies can go to landfill or simply sent to ground. removes solids down to 0.5 micron. OR; - go with bag filtration at 3-5 micron followed by UF. Safe Water Technologies makes a good, simple UF filter and that get's you down to 0.2 micron.

6340gpd at say 12hrs to treat = 8gpm flow rate. If can get by with 4-7gpm (23hrs) and want to keep costs down...

a. Water feeds to electrolytic oxidation system (pressurized); then through bag filter at 3-5 micron (figure to change out weekly, but bags can be rinsed and re-used); then to UF Filter (1) with auto backflush (using post R/O water - figure 3 gallons per day); then to RO. You need a low pressure RO or you'll have to feed to holding tank that feeds higher pressure to the RO then the 35-50psi needed for the first stage of the system.
b. Batch treatment: holding tank of say 250-300 gallons under going batch treatment . Electrolytic; bag filtration occurs all the time and you feed in new effluent water at 5-10gpm; Higher pressure pump pulls water from batch tank thru UF and RO into holding/reservior tank where pH adjusted back to neutral. If tank is sealed/covered. You can store the water virtually indefinately. Can also go from UF/RO to pressure tank with pH adjustment made in line.

All of the above get's rid of the sulfates, bicarbonates/carbonates, most of the heavy meteals, bacteria/viruses, fungi etc that will damage the RO membrane. RO is last filtration and either GE, Pentair, or Koch - those are the primary suppliers and most readily found in the US.