| 摘要 |
<p>Active substances and/or preparations are added in controlled quantities, at intervals. These agents contain one or more active components. They treat harmful organisms, using chemical and/or biological mechanisms. The organisms are killed, destroyed, damaged, inhibited, rendered harmless or otherwise combated. Simultaneously, or with a delay, air is dosed to the suspension. Air is dosed at or near the base of the tank. Preferably about 0.5 m3> of air is added per 5 m3> of the contents. Ambient air is used, blown in by compressor. The agents are biocides, such as protectives or preservatives, typically used for fluids in cooling- and process systems, and especially suspensions used in the papermaking industry. The suspension is aqueous; it is organic or inorganic. The material comprises proteins, carbohydrates and/or other hydrocarbons in organic systems, or a mixture. It is an aqueous suspension of cellulose and starch from paper manufacture. It is a cellulose suspension with solids content 0.1-80 g/l, preferably 30-60 g/l. Additions are made with pH and/or redox value control, or in terms of germ numbers present. The additives are dosed should the pH fall below 7, and/or when the redox potential falls below about -200 mV. Additions are preferably at the 25-50 ppm level. The additive is selected for the particular bacterial culture involved, and for its multiplication cycle. Vessel contents are recirculated and the agent is added at the base, with air being blown into a recirculation line. The medium is reject cellulosic material for intermediate storage in a papermaking plant. An independent claim is included for suitable equipment.</p> |
