Paper and pulp

Paper and pulp

Large amounts of process water

The paper industry uses large amounts of process water, particularly in the processing of pulp, wood or waste paper. The industry has been able to significantly reduce water requirements for the production of paper, cardboard and pulp. Germany is among the top leaders with approx. 10m3 of water per tonne of paper (2010) - 50 years ago, this figure was still almost 20 times higher.

Paper industry consumes large amounts of process water Likusta
Paper industry consumes large amounts of process water
Quality requirements for factory waste water are enormous Likusta
Quality requirements for factory waste-water are enormous

Organic and inorganic waste-water components

Due to the extensive closure of the water cycle, the use of water is further reduced, but problems such as salting, lime precipitation, and the formation of foam and odour occur. The quality requirements for water treatment are enormous. 

The waste water from paper factories contains, in addition to residues of the fibres, substances such as de-inking chemicals, bleaches such as hydrogen peroxide or chlorine compounds, process chemicals and additives. They are characterised by a high chemical oxygen demand (COD), and are first cleaned mechanically and subsequently biologically in either factory-based or municipal waste-water treatment plants. 

PR disaster in the event of environmental pollution caused by obsolete or badly planned systems

Compliance with the waste-water limit values ​​is absolutely crucial for the paper and pulp industries, since system errors in waste-water treatment can easily lead to considerable environmental pollution.

However, the paper and pulp industry has largely done its homework. Nevertheless, the prejudice against heavily fibre-laden paper waste water still exists. If such events actually happened, they could become a PR disaster for the polluter.

Waste-water limit values must be respected Likusta
Waste-water limit values must be respected
Likusta waste-water treatment systems are customer-specific
Likusta waste-water treatment systems are customer-specific

State-of-the-art water purification and low operating costs are no contradiction

Likusta fresh-water and waste-water treatment systems are planned and implemented according to the individual requirements of our customers in the pulp and paper industry. Our solutions include:

  • Fresh-water treatment:
    - Dosing systems for the addition of coagulation and flocculants

- Filtration and ultrafiltration systems

  • Waste and white-water treatment

- Dosing systems, e.g. for the addition of softeners or biocides
- Filtration systems for white water

- Membrane processes for the recovery/concentration of substances

  • Waste-water treatment
    - Dosing systems for the addition of precipitation agents and flocculants or for neutralisation

  • Waste-gas treatment
    - Activated carbon filter for VOC degradation

  • Control system design
    - Control cabinet construction
    - PLC programming
    - Sensor technology and remote maintenance

For small plants, it is worth considering batch-based treatment instead of continuous waste-water treatment as this can be done in a single tank.

Through the targeted expansion or renewal of the waste-water treatment systems, a costly enlargement of the entire plant can usually be avoided.


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