Aerobic granular sludge technology can be regarded as the future standard for industrial and municipal wastewater treatment. As a consequence, a growing number of institutes and universities focus their scientific research on this new technology. Recently, after extensive Dutch research and development effort, an aerobic granular biomass technology has become available to the market. Full scale installations for both industrial and municipal applications are already on stream, under construction or in design. The technology is distinguished by the name ‘Nereda®’ and based on the specific characteristics of aerobic granular sludge. It can be considered as the first mature aerobic granular sludge technology applied at full scale. It improves on traditional activated sludge systems by a significantly lower use of energy and chemicals, its compactness and its favorable capital and operational costs.
Aerobic granulation is seen as the future standard for industrial and municipal wastewater treatment and subsequently research efforts are quickly developing in this field. As an outcome of a concerted Dutch program, an aerobic granular biomass technology has been scaled-up and implemented for the treatment of urban and industrial wastewater. This Nereda ® technology is considered being the first aerobic granular sludge technology applied at full-scale. Operating data from the first municipal full-scale plant confirm the projected advantages with regard to treatment performance, energy-efficiency and cost-effectiveness. Currently approx. 40 international aerobic granular sludge plants are at various stages of development. For example, recently Brazil planned to build at least 10 plants in the coming years. The technology, now applied at tank sizes similar to the world's largest SBR-tanks, is considered proven and applicable for even the largest applications. During the presentation the latest results and lessons learned will be presented.
In densely populated areas new WWTPs will need to be designed on a relatively small area. This paper describes a deep Carrousel (oxidation ditch) concept resulting in a "small footprint" for the aeration basin combined with an efficient and flexible oxygen input. To enable surface aeration in a deep Carrousel system, the basin was provided with so-called draft tubes, vertical cylinders located underneath aerators, almost extending down to the bottom. A draft tube enables the aerator to draw sludge/water mixture from the bottom of the tank, thereby ensuring proper oxygenation of the tank contents over the entire tank depth. The results of pilot-scale tests for verification of the performance of an aerator equipped with a draft tube are presented. The full scale WWTP Leidsche Rijn, a compact "wrapped-around" Carrousel-3000 system where the draft tube technology is applied in a 7.5 metre deep basin, is described. Before the plant was put into operation a verification test for the aeration efficiency with clean water was carried out. The test showed that the draft tubes have no negative impact on the aeration efficiency of the surface aerators and justified the chosen design concept.
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