42805,
My colleague at work finished his Mechanical Engg. in the Phils. and has 10 years experience in Water Treatment Industry when he took the California P.E exam and passed. He waived the FE exam because of his 10+ years as Engineer.
Ver101
RHOEng,
The Dept. of the Army, US Corps of Engineers Design Guidelines for WasteWater Treatment should have these standards.
As a rule of thumb, I used the following figures in the design and has not received any complains so far:
1. For Middle East Location:
250 Liters (66 US Gallons)...
Brazilianjj,
I used the following formula for a long time without any problem. I can't remember whether it was from Grundfos Denmark or from an Italian Bladder Tank Manufacturer. Anyway here it is:
Vt=16.5 X Q/Zmax X (PUXPI)/(DPXPc)
Where:
Vt = The volume of the Bladder tank, in liters
Q =...
quark is correct, you can always stop the R.O.No need to flush and/or sanitize if shutdown is only for short duration (e.g.< 1 day). You may consider automating your shutdown and start up of R.O. by installing level switches in your storage tank. R.O. to shutdown when high level switch is...
Renhell, I don't know how small is the pump that you are looking for but try Danfoss Axial Piston Pumps type at the following link http://nessie.danfoss.com/. They make APP pump in small capacities in duplexx SS.I use them as HP pumps for small seawater desalination systems.
Pump designer, If water contains low dissolved oxygen < 1ppm, you may use nickel aluminum bronze material which is cheaper. However, if dissolved oxygen content is high, AISI 904L or Duplex SS must be used. These materials are widely used in Seawater Desalination plants with success. Goulds...
mutay,
It depends on the geographical location of the plant. In Asia and the Middle East, 60 USGPD per person per day is sufficient. While in the US and Europe, design of WTP based on 100-150 USGPD per person per day are very common.
Hope this helps.
Ver
Appreciate, if anybody can guide me to a good book reference to calculate/determine the approximate turbidity of product water after dosing with lime slurry.
We are using @ 45 ppm of lime slurry (95% as Ca(OH)2) to adjust the pH of water coming out of membrane plant from 4.8 pH to 8.5 pH. The...
Does anybody know of any Manufacturer/Supplier of Hollow fine fiber membrane for R.O. We used to buy from Dupont/Permasep, however, they had closed down. We need 30 pieces cross flow type hollow fibre membrane of 10,000 MWCO with filter area of 7-8 m2 per membrane. I know Toyobo of Japan used to...
Francis, I'm new to Engineering tips and read your post only today.
Anyway, you didn't mention the analysis of your feed water. Usually, with high Calcium and Magnesium hardness and with high HCO3, you do not adjust pH upward since Calcium Carbonate solubility decreases with increasing pH does...
I had used VFD in my projects for three years now and never had a problem. They are very handy to control either the discharge flow rates or the discharge pressures of centrifugal pumps. I like Danfoss and Toshiba, they are reasonably priced. Installations above 150 Hp. may need harmonic...
In the treatment of wastewater from vegetable oil manufacturing, we de-emulsify the emulsified oil in the wastewater by lowering the pH to 3 then separate oil through a flotation type clarifier(DAF). The pH of clarified water is then neutralized before sending to the biological treatment. Hope...
