Animal husbandry and aquaculture has become one of the three main sources of pollution to the water environment., scale farms discharge a large amount of high concentration wastewater everyday, and the wastewater contains a large amount of pollutants such as organics, residual veterinary medicines and many pathogens. If it is directly discharged into the environment or used in the farm without any treatment, it will cause severe pollution to the biological environment and the farmland.

Water Quality Characteristics
Wastewater from the livestock and poultry farms mainly contains urine, certain excrement and the water after washing the livestock houses. This kind of wastewater contains organics in high concentration, a lot of suspended solids and a high content of nitrogen and phosphorus, and it also has a big stench. The wastewater from the pig farm is high-ammonia nitrogen and high-organic wastewater, which contains a large amount of energy source.

Thought for Treatment
The aquaculture wastewater enters the wastewater treatment area through the sewage outfall; firstly, suspended solids of big size will be removed from the water by the grille ditch, and then it will be pumped into the solid-liquid separation machine for solid-liquid separation to prevent blockage to the equipment caused by the subsequent biochemical treatment; the separated solids will be delivered out and the wastewater enters the regulation tank; after balance of the water quality and water volume in the regulation tank, the wastewater is lifted to the B-UASB anaerobic reactor by the pump, and a large amount of organics are degraded under anaerobic condition, and the generated methane is collected and purified to be used as boiler fuel; after the anaerobic treatment, the wastewater flows into the contact aeration basin, the basin bottom has adopted fine bubble aerator to oxygenate the wastewater, and under the effect of the filler bio-membrane, organics in the wastewater will be further oxidized, decomposed and absorbed, and in the meantime, nitrogen and phosphorus will be removed; the effluent enters the secondary sedimentation tank, where the suspended sludge in water is precipitated and the aged bio-membrane shreds quickly, so that the effluent will have a water quality that satisfies the "Discharge Standard of Pollutants for Animal Husbandry and Aquaculture Industries" (GB18596-2001); the sludge separated in the wastewater treatment system will enter the sludge drying bed to be dried and delivered out.