Bienvenue sur le blog de Philippe Kouadio

Category Archives: Eau potable

Discussions, notes, commentaires sur la gestion et le traitement de l’eau potable

Small reverse osmosis parts and devices

January 7, 2021

Pre-Treatment Lockout Sends a signal to the RO system when a pre-treatment lockout condition occurs Tank Level Input Sends a signal to the RO system when a tank full or tank low condition occurs S150 Expander Board I/O expander board allows for 2 additional relay outputs and 1 additional switch input S150 Dual TDS Board ... Read More »

Membrane system feed flush

June 16, 2020

FLUSHING RO SYSTEM During flush, pump is off. Feed water is around 60 psi, permeate divert solenoid valve is closed, but diverted permeate pressure that is around 30 psi (less than inlet pressure) cannot enter in feed flush because inlet water pressure is too high. So permeate in note recycled. During production, when diverted permeate ... Read More »

Membrane system -simulation 3-4040

June 16, 2020

Case-specific: Membranes LE-4040 5000 GPD With recycle and 75% recovery   Feed Flow to Stage 1 7.63 gpm Raw Water Flow to System 4.63 gpm Feed Pressure 105.55 psig Flow Factor 0.85 Chem. Dose (100% H2SO4) 0.00 Total Active Area 282.00 ft² Water Classification: Well Water SDI < 3 Pass 1 Permeate Flow 3.47 gpm ... Read More »

Low Energy Membranes

July 29, 2016

Very good article of Bill Loyd in Watertechonline Taking advantage of low pressure membranes in commercial systems Note that AXEON Water Technologies has developped an extra low Energy RO membranes that are supposed to operate at pressure of 80 psi. I haven’t tried them yet, but this is an interesting innovation. Info here. These types ... Read More »

Performances of some Filmtec membranes

May 14, 2016

NOTES FROM DIFFERENT SOURCES AND PERSONAL  Performance of some FILMTEC membranes SW30HR BW30 XLE NF270 Feed pressure (psi) 370 150 70 50 Feed pressure (bar) 25 10 5 3.5 Rejection (%) Sodium chloride NaCl 99.7 99.4 98.6 80 Calcium chloride CaCl2 99.8 99.4 98.8 50 Magnesium sulfate MgSO4 99.9 99.7 99.2 99.3   At 18 ... Read More »

Scroll To Top