Wastewater sludge is becoming increasingly difficult to dispose of. Due to new environmental regulations more restrictions apply for using municipal wastewater sludge as fertilizer in agriculture. For incineration purposes or use as biomass the sludge needs to be dewatered. If the sludge is to be disposed of, each percentage in volume reduction leads to savings.
The low energy microflotation wastewater treatment technology developed by a German engineering company has proven most effective in sludge thickening. The thickening of activated sludge can be realised energetically from 20Wh/m³ with microflotation. In most cases, activated sludge can be thickened from 3-5g/l to 50-70g/l without the addition of flocculants.
Microflotation is a further technological development of classical dissolved air flotation. Microflotation produces monodisperse distributed micro air bubbles of the size class 30-50µm to float the activated sludge in a stable way. More than 90% of the microbubbles are within this size range.
Besides air, all industrial gases can be used as microflotation gas.
The microbubble density enables high total solids (TS) concentrations in the separated sludge. At the same time, the system enables low total suspended solids (TSS) concentrations in the clear running of the plants.
The patented technology is furthermore equipped with a self-cleaning mechanism allowing maintenance-free operation.
Applications are not only in municipal waste water treatment but also in food industry, slaughterhouses, aquaculture, chemical industry, steel works and textile industry. Plants can be supplied with capacities ranging from 1m³/h up to 4.000m³/h.
In principle, each wastewater problem and sludge thickening task must be considered individually. Pilot tests can determine guaranteed operating costs and limit values. The company has containerised mobile technical plants that can be used for this purpose.
Partners are sought for license agreements. Potential partners are engineering or plant construction companies, who would like to integrate the technology in their wastewater treatment solutions. The license can be restricted to a region or market application, according to the partners interests.