[Paper mill] OHR’s unique aeration in white water storage tanks reduces problems in the papermaking process.

OHR’s unique aeration in white water* storage tanks reduces problems in the papermaking process

We have learned that using OHR’s unique aeration in white water tanks at paper mills produces many benefits as follows:
We have proven results from six factories.

*White water means recycled water circulating in a paper mill. This water appears white in many cases due to the presence of fine fibers. It contains a lot of organic substances (fibers and various chemicals) and the water temperature is high, so the water tends to be anaerobic and decomposes in time. When this occurs, various problems in the paper making process are caused.

Advantage 1: The ORP value (oxidation-reduction potential value) rises considerably and hydrogen sulfide gas is not generated.

Advantage 2: The additive amount of biocides to control growth of microorganisms can be reduced by 30 – 50%.

When white water decays, the oxidizing power of the biocides is reduced. But if the white water is oxidized by aeration, the effectiveness of the biocides improves.

Advantage 3: The production of organic acid drastically decreases, so pitch problems in the paper making process are reduced.

Advantage 4: Strengthening additive agents and the load of wastewater treatment can be reduced.

When white water becomes anaerobic, the starch in the paper strengthening agents is decomposed and the concentration decreases. Hence the bursting strength of paper decreases greatly. However the white water is kept in the aerobic environment by OHR unique aeration method and the following three benefits are obtained.

  1. Most of the added paper strengthening agents remain in the paper without decomposing. The agents are effectively used without loss.
    So it is possible to reduce the additive agents.
  2. The paper strengthening additive agents can be reduced, therefore the agents flowing out into the wastewater also decrease.
    As a result the load of the wastewater treatment is reduced..
  3. The amount of decomposed paper strengthening agents can be reduced so the decomposed agents flowing out into the wastewater also decreases and the load of the wastewater treatment is reduced.

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