Mobile RO Station

Sir,

Please post it in the section of Civil Engineering.You will get immediate reply on your mail.

RO:

• Restriction Orifice?
• Reverse Osmosis?

Cooling tower blowdown point will depend on local water conditions, temperatures, air humidities and treatment regimes. Typically they will be in the region of 2500TDS, though this figure will vary with local operating experience.

5-10 micron filter and proper chemical balance to prevent scaling is all you should need for a typical cooling tower.

The other questions are, what is your water quality needs, what is your makeup water (feed water) quality, what makeup or treatment capacity do you need, there are a few more but these will cover the major points.

An RO system is designed to meet a specific output flow requirement, not vice versa. What is the design output flow for your portable RO unit, and what is its permeate output and TDS removal efficiency? Find out these three specifications from your supplier, and you'll be able to answer your own question.

As an example, if your permeate output efficiency is 70% and your output flow is 7 cu.m/hr, then your influent flow should be 7/0.7 = 10 cu.m/hr. Likewise, if your removal efficiency is 99.8%, then your permeate TDS concentration will be 100 - 99.8 = 0.2% of the original concentration. Please note that these figures are just approximations. Removal efficiency for nitrates, for example, will never be higher than 75%.

Finally, cooling tower blowdowns have a very high TDS concentration. You'll need to clean your membranes very frequently to prevent them clogging up. Your permeate output will also very likely be lower than its design value due to the much higher osmotic pressure the pump needs to overcome due to the TDS level.

Dear

But You know what?There is a general TDS we might work on as 3000 ppm for Blow down.I mean I need something generatic for my Case.Thanx for Advice but I really know all u sent.

You know Am thinking to solve this problem.It is a studying method.

Your advice is appreciated.

Thanx

Eng Dania

Assuming an influent TDS level of 3000ppm and a process removal efficiency of 99%, then your effluent TDS level with be 1% of that i.e. 30ppm. For your influent rate, as I mentioned earlier, you'll need to work backward from the permeate output i.e. if your permeate efficiency is 70% and your output is 7cu.m/hr, then your influent should be 7/0.7 = 10cu.m/hr, so if you are supplying water at 5cu.m/hr, then your output will be at 5 x 0.7 = 3.5cu.m/hr. That's about as generalized as I can put it to you. One more thing, portable RO systems are designed to operate within certain flow ranges as well, so you'll need to work out which is the optimum flow range for your needs, then purchase one that comes closest to your requirements. Best of luck to you.