Industrial effluents
製紙産業
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.
Reducing costs and minimizing pollutants with decanters from GEA
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.
Chemical substances can be reused
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.
製品および技術
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Jet pumps
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.
デカンタ遠心分離機
懸濁液の固体成分を高効率で処理するにあたり、デカンタの時代が到来しました。この機器は、高い浄化効率性と最大限の脱水だけでなく、固体の除去と同時に液体を分離できるようにします。ここでの主な要件は高いボウル速度、巻軸の強力な駆動装置および実現される固体脱水に自動的に順応する巻軸速度です。
