Nanofiltration and reverse osmosis
Reverse osmosis removes contaminants from unfiltered water, or feed water, when pressure forces it through a semipermeable membrane. Water flows from the more concentrated side (more contaminants) of the RO membrane to the less concentrated side (fewer contaminants) to provide clean drinking water. The fresh water produced is called the permeate. The concentrated water left over is called the waste or brine.
In osmosis, water becomes more concentrated as it passes through the membrane to obtain equilibrium on both sides. Reverse osmosis, however, blocks contaminants from entering the less concentrated side of the membrane. For example, when pressure is applied to a volume of saltwater during reverse osmosis, the salt is left behind and only clean water flows through.
Why use reverse osmosis filtration?
For many of our clients, the salt concentrates are the value-added compounds that they wish to extract from the wastewater produced in their production processes. By recovering salt concentrates, the cleaned water can then be discharged into the local water system further reducing disposal cost and the use of large evaporation tanks or ponds.
The Membranology MRO unit.
Membranology MRO rig shown below is a small volume, versatile and configurable for a wide range of applications tailored to customer requirements. The filtration rig shown is fitted with a 4040 – membrane housing with a typical membrane area of around 8m2.
Clean water flux will depend on the membrane chosen and operating pressure (45 bar), with the system capable of working with a wide range of membrane filters. This unit also has automated control of the individual pumps to control both the flow and pressure at set values independently.
Installed instrumentation measure pressure, temperature, flow, pH, and conductivity
The system has a control screen where the system is operated from which can be accessed remotely the system features independent automated control of the operating pressure and re circulation flow rate, along with data logging of all measured variables.
A concentric tube heat exchanger is included for thermal control located within the high pressure re circulation loop.
Uses for reverse osmosis filtration systems
Reverse osmosis filtration is currently being used in the automotive, food and drink and agriculture sectors to great effect. Reducing harmful contaminants reaching watercourses and recovering valuable components from process waste water.
Recycling of process chemicals from wastewater
A reverse osmosis system removes dissolved solids like arsenic and fluoride through the RO membrane. An RO system may also include sediment and carbon filtration for a broad spectrum of reduction. Carbon filters can be added to our MRO system to remove chlorine, a micro filter removes dirt and debris as wastewater enters the unit. The pressurised system then forces the remaining solution through the Reverse osmosis (RO) filters ensuring high volume recovery of dissolved salts and compounds.
Membranology technical filtration engineers and consultants are available to assist in developing a rig to suit your process needs. Reducing waste and recycling valuable components for reuse or sale.
Speak to our filtration consultants on +44(0)1792 799918 to arrange a meeting.