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Reverse Osmosis / Nano, Ultra and Micro Filtration

Reverse Osmosis / Nano, Ultra and Micro Filtration

Reverse Osmosis / Nano, Ultra and Micro Filtration

Membrane Plants

Membranes are used to separate, concentrate, or fractionate a wide variety of liquids. Membranes serve as a thin barrier between miscible fluids that allow for preferential transport of one or more feed components when a driving force is applied, such as a pressure differential.

Spiral wound membrane elements are fed tangentially. When sufficient pressure or concentration differentials exist on the surface of the membrane, molecules smaller than the surface pores will be driven through it. This solution that passes through the membrane is called the permeate, while the solution rejected by the membrane is called the concentrate.

During the last years the technology of membranes has positively developed, it has become so convenient with low energetic consumption and excellent results, that most of the traditional technologies have been neglected.

MDC Water designs and builds membrane plants for the treatment of primary, process and discharge waters.

Reverse Osmosis Systems

Reverse osmosis is a water treatment process, that forces water through an extremely fine semi-permeable membrane, (pore size around 0.1 nm), to remove dissolved solids, but Strictly speaking, RO is not a size exclusion process based on pore size; it depends on ionic diffusion to affect separation.


Nanofiltration Systems

With a pore size between 0.2-10 nm, Nanofiltration membranes allow water and some salts to pass through the membrane while retaining multivalent ions, low molecular weight molecules, sugars, proteins, and other organic compounds. NF reduce levels of hardness, nitrates, sulfates, tannins, turbidity, colour, and moderate levels of salt from feed water streams.

Ultrafiltration Systems

UF membranes typically have pore sizes in the range of 0.01 – 0.1 µm which contributes to a high removal capability of bacteria, viruses, colloids and silt, thereby producing high-quality water. Ultrafiltration elements are used to treat surface water, ground water, seawater and waste water as either primary treatment or as pretreament to RO and NF.

Microfiltration Systems

With a pore size range of 0.1 to 10 μm, microfiltration membranes are capable of separating large suspended solids such as colloids, particulates, fat, and bacteria. Microfiltration may also be used in combination with other membrane technologies such as RO, NF and UF.
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