Industrial effluents
The paper-making process is one of the most water-intensive industrial production processes. This is because, without the physical properties of water, it would not be possible for a consistent structure to be achieved when the constituents of paper are processed in sludge. A high level of water consumption is inevitable in the processing of natural raw materials (wood, cellulose, vegetable fibers) and also in the process of recycling waste paper. This creates a high level of waste water for processing. The residues in the waste water are a problem particularly in the case of de-inking: the process of recycling printed waste paper.
This demonstrates the tremendous advantages of a GEA decanter, both in terms of competitive advantages by way of reducing costs in the paper industry and also for environmental protection by minimizing pollutants.
In addition to the above-mentioned constituents, further chemical substances are also added depending on the desired paper quality – for instance whiteners, inks or dust-inhibiting agents – which have to be removed from the waste water at the end of the production process.
During pre-clarification and post-clarification, primary, secondary and flotation sludges are produced which are dewatered individually or together by the decanter. Because of the high dry substance, the storage and disposal costs are reduced, the volume of fresh water is minimized, and expensive chemical substances can be reused on several occasions – a factor which likewise has a positive impact on the economic balance. The dewatered sludge can either be dumped, dried or incinerated.
GEA further supplies equipment like jet and vacuum pumps for conveying liquids such as water or sludge and solids like fibers in the paper industry.
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The decanter’s hour has come as soon as the solids content in the suspension to be processed is particularly high. These machines provide the benefits of high clarifying efficiency and maximum dewatering as well as the separation of liquids with the simultaneous removal of solids. The main requirements in this respect include a high bowl speed, a...
Jet pumps, also referred to as ejectors, are devices for the conveyance, compression or mixing of gases, vapors, liquids or solids and for the production of vacuum in which a gaseous or liquid medium serves as the motive force.
Waste reduction is important to us at GEA, and by harnessing the power of freeze drying technology, we can transform surplus food into valuable, long-lasting products – helping to reduce waste, extend shelf life and build a more resilient food supply for generations to come.
When plant-forward South Korean food producer Pulmuone brought GEA the challenge of developing a modern spin on the traditional chewy cold (naengmyeon) noodle, GEA’s R&D experts were up to the challenge. They helped develop what is now a commercial hit produced with less water and electricity than previously existing methods. The result is also true to the traditional origins of the dish as well as Pulmuone’s health, well-being and sustainability roots.