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Mechanical Equipment Designed for Settling Basins of ALVEST System
Currently we are engaged in designing new concept of technological equipment for circular settling basins. Patent application will be submitted prior to its first implementation followed by making public its design as well. The merits of such design will be as follows:
  • It fits basin size ranging from 7 m to round 50 m.
  • Very low material consumption  about 3 times lower compared to classic structures complete with traversing bridge. This enables to accomplish lower production costs by at least 50%.
  • High efficiency  SM (solid material - insolubles) content up to 10 mg/l.
  • Skimming the surface & bottom as well.
  • This design in linkage with AX axial flow pump manufactured by us makes it possible to increase sludge recirculation at the existing settling basins concerning Municipal WWTPs (Waste Water Treatment Plants), and hence raise sludge concentration within activated sludge process (aeration) along with enhancing treatment efficiecy substantially. Refer to the example hereinafter.
  • The entire equipment is feasible to be taken out from a full basin under operation within 1-2 hours, and able to be installed back into the basin fully filled with water following any if its maintenance.

Example:

The existing Municipal WWTP: its average flowrate is Q24 - 5000 m3/day = 208 m3/hour. Circular secondary settling basin is of 25 m diameter & 3,5 m water depth. Return sludge recirculation is R * 60 % Q24 = 104 m3/hour. Return sludge concentration equals to 8 kg/ m3. Sludge concentration within aeration tank (activation) is 3 kg/ m3.
The settling basin revamp using ALVEST System will enable sludge circulation to increase from current R = 60 % to R = 150 %. When reaching return sludge concentration of 8 kg/ m9 the sludge concentration in aeration tank (activation) will grow to 4,8 kg/ m3. In this way the amount of sludge within aeration (activation) system will rise  i.e. in secondary settling basin by 60 % against its original state, and consequently the biological efficiency of treating will increase significantly as well.