Livestock wastewater treatment system

Aquaculture wastewater has typical "three highs" characteristics, namely high organic matter concentration, COD up to 3000-12000mg/l, ammonia nitrogen up to 800-2200mg/l, and suspended solids SS exceeding the standard by tens of times; The biodegradability is average; Strong odor; The flushing discharge time is concentrated and the impact load is high. Based on the characteristics of this sewage, a combination of biochemical and physicochemical treatment methods can achieve good treatment results.

Treatment process: aquaculture wastewater - grid - fecal separator - regulating tank - UASB - SBR - sedimentation tank - disinfection tank - effluent.

After coming out of the pig farm, the breeding wastewater flows through the grid and mesh, where most of the larger impurities are removed before entering the biogas digester. In the biogas digester, organic matter undergoes hydrolysis under anaerobic conditions, transforming from recalcitrant high molecular weight organic matter into easily biodegradable small molecular weight organic matter for subsequent processing.

After passing through the regulating tank, the aquaculture wastewater is pumped into the hydrolysis and acidification tank by a lift pump. The acidification and hydrolysis tank adopts a rising flow anaerobic sludge reaction bed form (UASB reaction tank). At the same time, the mixed solution returned from the contact oxidation tank is denitrified under the action of denitrifying bacteria, achieving the purpose of biological denitrification! The aquaculture wastewater enters the contact oxidation tank to further degrade organic matter and remove a large amount of phosphorus!

Removal efficiency: Solid liquid separation can remove 30% -40% of SS and 25% -30% of BOD5 from aquaculture wastewater. UASB can remove up to 75% -85% of COD, and SBR can remove 85% -90% of COD, 82% -92% of BOD, and 95% -98% of ammonia nitrogen. After treatment, aquaculture wastewater can be discharged in compliance with standards!