The invention belongs to the field of
environmental protection and particularly relates to an advanced
sewage treatment technology which comprises the following steps: after being subjected to biochemical treatment,
sewage sequentially passes through a preoxidation unit, an
electrolysis catalytic oxidation unit, a regeneration unit, a catalyst ultrasonic cleaning unit and a catalyst separating unit to meet the
discharge standard. The static
bed catalytic oxidation technology is adopted to reduce the COD load to a certain level, so that the follow-up COD load of a subsequent
electrolysis catalytic oxidation unit is also reduced, the improvement on the
sewage treatment depth is facilitated, and the
effluent quality is better and more stable. With a static
bed catalytic oxidation unit arranged in front,
heavy metals and other materials in water toxic to a catalyst can be intercepted, so that a suspended particle catalyst with higher production cost can be protected, and the service life of the catalyst is prolonged. By timely adjusting the dosage of an
oxidizing agent, the problem about load fluctuation can be instantly solved, the problem that the suspended particle catalyst is attached by
dirt is also solved, the recycling of the suspended particle catalyst is realized, and the cost is lower.