Sewage and wastewater treatment device and method

The invention discloses a sewage and wastewater treatment device comprising an acid ferrous sulfate adding system, a water feeding pump, an oxydol adding system, a tubular mixing reactor, a stay water tank, an aeration tank and an aeration system. The invention further discloses a sewage and sewage treatment method comprising the steps of mixing inflow water and acid ferrous sulfate solution together under the action of an impeller of the water feed pump, and mixing a mixture from the former step with oxydol through the tubular mixing reactor to generate Fenton catalytic oxidation reaction; and entering mixed reaction effluent into the aeration tank for aeration after passing through the stay water tank to finish the Fenton catalytic oxidation reaction. The device and the method disclosed by the invention are suitable for upgrading emission reduction of sewage and wastewater, and have the advantages of short reaction time, high treatment efficiency, civil engineering conservation and simple and convenient operation.