Pig manure organic fertilizer production lines generate wastewater, which can pollute the environment if not handled properly. Effective wastewater treatment is key to achieving green production.

1. Solid-Liquid Separation

Start by separating solids from the wastewater. Use equipment like mechanical screens, filters, or centrifugal separators to remove large solid particles. These solids can be fed back into the organic fertilizer production line for reuse. This step reduces the load on later treatment stages and recovers valuable materials.

2. Anaerobic Treatment

The separated wastewater still contains high levels of organic matter. Treat it using anaerobic processes like fermentation tanks. In oxygen-free conditions, anaerobic bacteria break down organic matter, producing methane gas (biogas). This biogas can be reused as energy for heating or generating electricity, maximizing resource efficiency.

3. Aerobic Treatment

After anaerobic treatment, move to aerobic processing. Use methods like the activated sludge process or biofilm methods to further break down remaining organic matter with oxygen. Aerobic microbes convert pollutants into harmless substances like carbon dioxide and water. Aeration systems maintain oxygen levels for optimal results.

4. Advanced Treatment and Reuse

Post-aerobic treatment, apply advanced methods like filtration and disinfection to remove leftover particles and bacteria. Once the water meets standards, reuse it for tasks like equipment cleaning to cut freshwater use.

5. Chemical Treatment

Chemical Precipitation: Add chemicals to wastewater to trigger reactions that turn pollutants into insoluble solids for removal.

Chemical Oxidation: Use oxidizing agents (such as ozone, hydrogen peroxide) to break down organic pollutants into harmless compounds.

By implementing these steps, pig manure organic fertilizer production lines can treat wastewater effectively, balancing environmental protection with resource recovery.