Dissolved-air flotation optimised for exhaust air treatment cycles


Source: EnviroChemie GmbH

EnviroChemie has received German utility model protection for a specific dissolved-air flotation system from the Flomar® series. This particular version is particularly well suited to depleting the solids from highly polluted exhaust air treatment wash cycles, for example from washing towers or electrostatic precipitators. The task here is to reduce the pollutants from the cycles without substantial usage of salt and to thereby keep costs down. Complete clarification of the wastewater is not necessary.

Traditional dissolved-air flotation systems produce the flotation motive water through air saturation of a partial flow in the plant outflow. The saturation usually takes place using multi-stage pumps, which only run smoothly if they are fed with pH-neutral wastewater that is mostly free from solids. The injector system developed by EnviroChemie achieves micro-bubble formation comparable to saturation by pumps. The air saturation of the partial flow is carried out by an injector pressure container, which is fed by a wastewater pump resistant to solids and which can handle both alkaline and acidic wastewater without any problems. This enables cycles to be driven through flotation systems without chemical conditioning or neutralisation. The flocculant dosage is required only to produce separable flocs. If floating solids are present without flocculation, a chemical-free procedure is possible. 

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