Livestock wastewater treatment system

The present invention discloses a livestock wastewater treatment system, comprising a catchment area, a solid- liquid separator, a scraper type pre-settling area, a hydrolysis acidification area, a micro-electrolysis anaerobic area, a buffer area, an air-flotation flocculation area, an anaerobic area, an aerobic area, a secondary settling area, a water distribution and disinfection area, a sand-bed filter, an ultrafiltration membrane and a sludge thickening area which are connected through water passages in a treatment sequence. The secondary settling area is connected to the aerobic area through a first sludge return passage and to the sludge thickening area through a first sludge thickening passage. The present invention has the advantages of high volumetric loading rate, high treatment efficiency, and easy operation and management without sludge bulking. It is reasonably designed and can well reduce the treatment cost by the combination of air flotation flocculation, micro-electrolysis anaerobic treatment, aerobic treatment, sand- bed filtration and disinfection by sodium hypochlorite, and the treated wastewater meets the standard with much less sludge to be discharged, which can reduce the harm of livestock wastewater to the environment.