Methods for treating livestock and poultry breeding wastewater
The treatment of livestock and poultry breeding wastewater is an important environmental task, mainly targeting the feces and urine generated during the breeding process. The following are common methods of handling:
Main processing techniques
Solid-liquid separation
Mechanical separation: Separating solid substances from liquids through equipment such as sieves and centrifuges to reduce the burden of subsequent processing.
Biochemical treatment
Efficient nitrogen phosphorus biochemical cycle treatment: Removing ammonia nitrogen and phosphorus from water through microbial metabolism. This process usually includes steps such as denitrification and nitrification to achieve the removal of nitrogen and phosphorus.
Improved oxidation ditch: Utilizing microorganisms in the oxidation ditch to degrade organic matter and remove nitrogen under aerobic and anaerobic conditions.
Sludge reflux treatment
Reflux the sludge generated during the treatment process to improve the treatment efficiency and stability of the system.
Filter and disinfect
Through filtration and disinfection steps, pathogens and suspended solids are removed from the water to ensure that the effluent meets discharge standards.
Example of Processing Flow
Preprocessing: Solid liquid separation to remove large particulate matter.
Biochemical treatment:
Wastewater enters the denitrification unit for ammonia nitrogen removal.
Then enter the aerobic tank for organic matter degradation.
Sludge reflux: Reflux a portion of the sludge to the denitrification unit to improve reaction efficiency.
Precipitation and filtration: After precipitation, clean water is filtered and disinfected.
Key parameter control
Dissolved oxygen should be controlled between 0.5 mg/L and 2 mg/L to ensure the normal metabolism of microorganisms.
The pH value is usually maintained between 6 and 9 to meet the growth needs of most microorganisms.
By combining these processes, the concentration of pollutants in livestock and poultry wastewater can be effectively reduced, ensuring that the effluent meets environmental standards and thus reducing the impact on the environment.