More robust and stable

MANN+HUMMEL expands it product portfolio for water filtration with hollow fibres made from PES (polyether sulfon). The filtration specialist plans to use these membranes to open up new application areas with higher requirements regarding temperature and chemical stability. In combination with a new modular layout and improved flow geometry the company has improved filtration performance and simultaneously reduced energy consumption.

Ludwigsburg, November 1, 2011 - MANN+HUMMEL has added a further polymer hollow fibre to its product portfolio for water treatment systems. At the company's plant in Singapore, where the group's water division has its headquarters, four new production lines for hollow fibre membranes made from polyether sulfon (PES) are being set up. An extension of the production lines is already planned.

PES is characterised by a higher chemical stability, improved stability with regard to mechanical loads and permits higher operating temperatures than PAN (polyacrylonitrile) such as are necessary for steam sterilisation. MANN+HUMMEL plans to use the PES hollow fibres for new application areas within its water business, e.g. with the food and beverage industry and in the field of biotechnology.

The walls of the PES hollow fibres are partially permeable and function as a membrane with microfiltration and ultrafiltration. This enables a mechanical separation process. Microscopic contaminants flow through the water into the pores of the PES fibres. Important parameters are therefore the pore sizes of the fibres and size of the molecules to be separated. PES membranes for microfiltration offer pore sizes of 100 to 200 nm. Membranes for ultrafiltration are characterised by pores with 10 to 20 nm. As we know, a nanometre is a millionth of a millimetre. Using ultrafiltration MANN+HUMMEL therefore separates molecules which are significantly smaller than the diameter of a human hair.

In the field of beverages and biotechnology, fouling (deposition) due to the filtered substances is common. The cross-flow flow guidance of the PES hollow fibre acts against this. It generates a cross-flow along the membrane with high speed and automatically carries the fouling products with it.

A bundle of hollow fibre membranes are integrated in a filter module which in turn is a component part of a newly developed modular skid design. The system consists of up to 50 filter modules and depending on the membrane type runs in cross-flow mode or dead-end mode. With dead-end filtration the fluid is pumped at low pressure against the membrane and the depositions removed at regular intervals by rinsing.

MANN+HUMMEL is able to exploit its extensive experience over many years in the simulation of flow characteristics of fluids in the automotive field. The filtration specialist has now transferred its expertise and experience over to the field of water and developed improved membrane modules to enable higher performance. In combination with an improved flow geometry and new module design, the PES membrane offers a longer life under standard and extreme operating conditions. Depending on the specific requirements with regard to lifetime and operating conditions, membranes made from PES and PAN find application.

MANN+HUMMEL uses PES membranes and the new skid design in ultrafiltration systems its Klar-series. The Klar-series is suitable for the treatment of process and service water for small rural communities, towns and villages, hotels and resorts and also for the treatment and recycling of industrial process and waste water. It removes foreign particles, and bacteria with a turbidity of less than 0.1 NTU. To give an example: Trained people manage to see a turbidity of more than 10 NTU. Maintaining the turbidity under 0.1 NTU means that the system delivers a consistent supply of fresh, clean water on time and every time. It filters a variety of suspended solids and has a bacterial removal rate of 99.999 %. In addition, the Klar-series does not employ any water purification chemicals for the filtration process, thus ensuring a high quality supply of process and service water.

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The MANN+HUMMEL Group is a development partner and original equipment supplier to the international automotive and mechanical engineering industries. Employing approx. 13,200 people at 41 locations worldwide, the company achieved turnover of 2.18 billion euros in 2010. The group´s product portfolio includes air filter systems, intake manifold systems, liquid filter systems, cabin filters and cylinder head covers made of plastic with many integrated functions for the automotive industry, as well as filter elements for vehicle servicing and repair. For general engineering, process engineering and industrial manufacturing sectors the company´s product range includes industrial filters, a series of products to reduce carbon emission levels in diesel engines, membrane filters for water filtration, filter systems and complete lines as well as units for conveying, dosing and drying of free flowing plastics. Further information about MANN+HUMMEL can be found under www.mann-hummel.com.

The group´s water division has its headquarters in Singapore. Further information is available at www.mannhummel-water.com.