The invention provides a nano-
catalysis,
electrolysis,
flocculation and air-floatation device. A coagulative
precipitation tank, a primary air-floatation tank, an electrolytic air-floatation tank and a
slag-discharging tank are arranged in a housing of the device, wherein the top of the coagulative
precipitation tank is provided with a water inlet and a mixer; the bottom of the coagulative
precipitation tank is communicated with the primary air-floatation tank; a side
sewage-draining outlet is connected with a
sewage-draining
pipe; a dissolved
gas release pipe is arranged at the edge of the primary air-floatation tank; the
sewage-draining outlet is connected with the sewage-draining
pipe; the upper portion of the inner side of the primary air-floatation tank is communicated with the electrolytic air-floatation tank; the electrolytic air-floatation tank is divided into an upper layer and a lower layer by an upper-lower separator plate; a
slag-scraping device is arranged in an upper gas-liquid separation chamber; an
electrolytic cell is mounted between the upper layer and the lower layer of the electrolytic air-floatation tank; the bottom of the
electrolytic cell is fixed on the inner bottom of the casing; the top of the
electrolytic cell is open and horizontal with the top of the upper-lower separator plate; an
electrode is installed in the electrolytic
cell; and an interval between an
anode and a
cathode of the
electrode serves as a water passage. The device integrates multiple functions of
electrolysis,
flocculation precipitation, air-floatation and the like together, has high
automation degree, sewage-discharging efficiency and low running cost, and is convenient for operation and maintenance.