New acts on wastewater disposal demand for higher process stability and effluent quality.

The A-B process, a novel two step treatment system, meets these requirements in a cost effective way.

Five full-scale plants have been put in operation over the last two years.

The objective of this paper is to give an outline of the features of the A-B system in the context of the results of these full-scale plants.

In spite of the extreme high load, the A-stage can be operated at a high reduction rate and is stable. Variations in the organic load and pH- and toxic shocks are leveled out and a constant, mainly soluble effluent is supplied. This implicates a low sludge production in the B-stage. As a consequence higher overall reduction rates are obtained as compared to conventional processes at the same sludge load. Very low and stable final effluent concentrations are observed in all full-scale plants.

Of special interest are the possibilities of upgrading existing conventional treatment facilities, at minor costs, by incorporating the A-B technology.

The A-B process therefore can be considered as a very promising, cost effective alternative for both existing and new wastewater treatment plants in responding to the increasing effluent demands.

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