What is by-product of wastewater?

The by-products of wastewater treatment can include biOSolids, which are nutrient-rich organic materials that can be used as fertilizer, and treated water that can be reused for irrigation or industrial processes. Additionally, gases such as methane may be generated during anaerobic digestion of organic matter in wastewater. Other potential by-products include various chemicals and pollutants that may require further treatment before disposal or reuse.