Ultra filtration (UF) is a low pressure-driven mechanical process, which will remove particles from 0.005 to 0.05 microns in size. The process preferentially separates and concentrates suspended solids, bacteria, some proteins, pigments, colloids and constituents that have a larger molecular weight of greater than 10,000 daltons. Eco Technology Limited typically apply UF technology for treatment of oil emulsions, `coolants' or `soluble oil' and paint wastes.

The UF membranes are tubular filters, which deflect metals, oils and grease while allowing water and some cleaning chemicals to pass through. UF membranes are partially permeable to perform the separation, but the pores are typically much larger than those that are used in nano filtration, and the process does not require the same energy to perform the separation. Ultra filtration is only somewhat dependent upon the charge of the particle and is much more concerned with the size of the particle.

Typical UF systems use the wash water to flow over the membrane surface at a precise flow rate and pressure, which keeps the surface clean from debris build up. (Unlike conventional filters which can clog up with contaminants). This process is referred to as "cross flow".

Series 1000 UF System

Ecomem have recently released the Series 1000 UF system which has a treatment capacity of up to 1000 litres per day. Retailing at under £7500 the system is ideal for small to medium sized organisations. The system can be used to treat liquid waste from 205 litre drums, 1000 litre IBCs and bulk storage tanks. Suitable effluents include semi synthetic coolants, soluble oils, wash water wastes, and water based paint wastes.