Microflotation assembly with • a reactor vessel which has a water inlet and is designed to enrich water supplied via the water inlet with a gas under increased pressure and to make the dispersion water thus formed available at a dispersion water outlet, • a flotation basin comprising a dispersion water intake, • an expansion valve assembly via which the dispersion water outlet is connected to the dispersion water intake, • a measuring device which is designed to measure at least one parameter of the water to be supplied via the water intake, on which the solubility of the gas in the water depends, • an adjusting device with which a flow rate of the expansion valve assembly can be adjusted, and • an electronic controller connected to the measuring device and the adjusting device and adapted to adjust the flow rate in dependence on the at least one parameter measured by the measuring device, characterized in that • data on the dependence of the solubility of the gas in water on the at least one measured parameter are stored in the electronic controller, and • the electronic controller is adapted to adjust the flow rate so that the amount of gas supplied to the flotation basin with the dispersion water via the dispersion water intake remains unaffected by the measured parameter, wherein • a further measuring device is provided which is configured to measure a particulate content of the wastewater, the electronic controller being connected to the further measuring device and to a pressure controller of the reactor vessel and being configured to control the increased pressure in the reactor vessel as a function of the particulate content measured with the further measuring device. • a reactor vessel which has a water inlet and is designed to enrich water supplied via the water inlet with a gas under increased pressure and to make the dispersion water thus formed available at a dispersion water outlet, • a flotation basin comprising a dispersion water intake, • an expansion valve assembly via which the dispersion water outlet is connected to the dispersion water intake, • a measuring device which is designed to measure at least one parameter of the water to be supplied via the water intake, on which the solubility of the gas in the water depends, • an adjusting device with which a flow rate of the expansion valve assembly can be adjusted, and • an electronic controller connected to the measuring device and the adjusting device and adapted to adjust the flow rate in dependence on the at least one parameter measured by the measuring device, characterized in that • data on the dependence of the solubility of the gas in water on the at least one measured parameter are stored in the electronic controller, and • the electronic controller is adapted to adjust the flow rate so that the amount of gas supplied to the flotation basin with the dispersion water via the dispersion water intake remains unaffected by the measured parameter, wherein • a further measuring device is provided which is configured to measure a particulate content of the wastewater, the electronic controller being connected to the further measuring device and to a pressure controller of the reactor vessel and being configured to control the increased pressure in the reactor vessel as a function of the particulate content measured with the further measuring device.