Friday, 15 August 2014 07:45

Mapal GE adapts FFBA technology for pulp and paper manufacturers

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Are bubbles the answer to treating wastewater in the pulp and paper industry?

2014-08-15 074728 maplePulp and paper making is renowned as one of the most water intensive industrial production processes anywhere. Processing pulp requires huge quantities of water to deliver a consistent structure. The constituents of paper are processed into a sludge form and with water used at almost every stage of production, the result is the generation of a high quantity of highly contaminated level of wastewater which has to be treated to meet regulatory and environmental consents.

Some estimates suggest up to 17.4 cubic metres of water are required to produce one metric tonne of paper, with the raw wastewaters from pulp and paper and board mills often requiring complex biological treatment processes. It’s a challenge the industry has embraced however, with around 92% of the water used returned to the environment, after it has been treated. The filtering and removal of contaminants from the wastewater can be very energy demanding, with mechanical surface aeration and sub-surface jet aeration systems for biological treatment, known to consume high volumes of electricity. Energy reduction, operational cost reduction and water recycling initiatives are therefore important objectives for many paper manufacturers.

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In pulp and paper mills, waste water treatment can take on several forms, from filtering through to biological treatment process.  For biological treatment to be effective, the waste water needs to be effectively aerated,

Many UK mills will use mechanical surface aeration techniques in order to supply the required oxygen for bacteria to achieve an aerobic biological treatment, especially where an activated sludge process is involved. However, mechanical surface aerators are typically expensive to operate and maintain, old, prone to breakdown, due to the number of moving parts andhave considerable energy consumption, all of which adds up to relatively high operating costs.

Enter Mapal Green Energy with its innovative Floating  Fine Bubble Aeration technology (FFBA), currently used by Anglian Water with further deals signed with  Thames Water and United Utilities for systems to go live before the end of the year, where Mapal GE’s equipment will be used to treat domestic and industrial wastewater in a range of lagoons and reactors. The same technology has also been deployed successfully in South Africa in the pulp and paper sector and again in factory farming installations in Israel, where the challenges of treating aggressive and hazardous liquids echo many of the issues faced in the pulp and paper industry.

A revolutionary solution, floating fine bubble aeration approaches the challenge of wastewater oxygenation by marrying the strengths of mechanical surface aeration technology – easy to install and accessible for maintenance - with the efficiency which is derived from sub surface fine bubble aeration systems. With no moving parts generating friction and driving high energy consumption, a key benefit for users of Mapal Green Energy’s floating fine bubble aeration system is its dramatically reduced energy bill. Tests around the world have shown that in some cases, compared to mechanical surface aeration, a plant’s energy consumption can be reduced by up to 70% using the Mapal system, with savings of 50% regularly achieved.

Commenting on the ease of installation of the system, Mapal’s UK sales manager Andy Carling said, “By substituting a surface mounted propeller for a system of blowers and fine bubble diffusers, not only is energy consumption reduced, but installation and maintenance is dramatically simplified. The system does not require a tank to be drained, nor does it need to be attached to a concrete floor. Aerators are automatically adjustable to water depth and because they float, are always level, thus delivering an even flow of oxygen within the reactor.”

Mapal’s units are made from robust stainless steel, so have a long life and as a modular system, the installation can be added to or taken away from quickly and easily.

A technology which is creating waves amongst the UK’s water utilities looks set to revolutionise wastewater treatment in selected sectors of the pulp and paper industry too.

For details of Mapal Green Energy’s floating fine bubble aeration technology, please visit http://www.mapal-ge.com

Additional Info

Mapal Green Energy pioneered the concept of floating fine bubble aeration (FFBA)as a more efficient means of treating waste water for both utility companies and industry applications.

Floating fine bubble aeration approaches the challenge of waste water biological aeration by marrying the strengths of surface aeration technology – easy to install and accessible for maintenance - with the efficiency which is derived from sub surface fine bubble aeration systems. With no moving parts generating friction and driving high energy consumption, a key benefit for users of Mapal Green Energy’s floating fine bubble aeration system is its dramatically reduced energy bill.

Tests around the world have shown that in some cases, compared to surface aeration, a plant’s energy consumption can be reduced by up to 70% using the Mapal system,

With over 35 installations worldwide, Mapal's floating fine bubble aeration technology has been proved to meet and exceed stringent effluent quality parameters including the reduction of : BOD5, TSS, COD, Tkn and Ammonia.

In the UK, the system is being used by Anglian Water, Thames Water and United Utilities.

Mapal’s innovative equipment floats on the surface, so wet and live installation is the norm, which makes for a very fast changeover of plant and a minimal downtime. The units are made from robust stainless steel, so have a long life and as a modular system, the installation can be added to or reduced quickly and easily. Thus far, their largest UK installation is designed to handle a flow rate of up to 10,450m3/day in wet weather.

The Mapal technology can be adapted for aggressive and hazardous liquids and is therefore suitable for application across a wide range of industry sectors where a solution based on aeration is required. Liquid waste from the paper, food and beverages, petro chemicals and other industries can all be treated.

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