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| Activated sludge plants | |
| Mixing and equalization | |
| Single-basin plants (simple SBR plants) | |
| High-performance reactors | |
| Sludge stabilization | |
| Waste water lagoons | |
| Flotation | |
| Neutralization | |
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| High-performance reactors |
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High-performance reactors are used for the preliminary treatment of waste waters with very high BOD5 or COD loads (e.g. yeast plants, distilleries and pharmaceutical plants). Like activated sludge plants, the reactors can be equipped with secondary clarification basins and sludge return lines. High-performance reactors are always followed by a high-load waste water treatment plant and frequently by a second, low-load plant. High-performance reactors are closed systems working with a constant water level. They usually have diameter A (cfr. our information brochure) and heights of at least 10 meters. High-performance reactors may have BOD5 loads of up to 100 kg BOD5 per m3 x d! Biodegradation produces a relatively high process heat. This heat can be dissipated via especially installed dissipation lines and used for heating purposes or power generation. This kind of power generation is an alternative to anaerobic reactors producing biogas. The high oxygen transfer required by this system is provided by FRINGS immersible TRG aerators. Aeration with high oxygen transfer produces foam. The use of our mechanical defoamers may therefore be necessary. An Austrian producer of pharmaceuticals (world market leader in the production of Penicillin) is using eight FRINGS immersible TRG 7200 aerators installed in eight high-performance reactors with diameters of 6 m and heights of 11 m. In these high-performance reactors, waste waters with a COD load of up to 45,000 mg/L are treated! The COD load in these reactors is up to 60 kg COD per m3xd. The COD decomposition rate is about 40 %. Therefore, operating results of high-performance reactors equipped with immersible aerators are available. |
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