There are several factors that can contribute to high BOD levels: nitrates and phosphates present in the wastewater, water temperature, and others. Each factor affects the plant life in the water, such as algae, and in turn also has an effect on the organisms that help decompose water contaminants in the wastewater treatment process. The best quality wastewater treatment will occur in an environment that supports the life of these bacteria while maintaining a controlled population of them so as to not encourage rapid bacterial decomposition, which would create  higher BOD levels.

Similar to BOD is chemical oxygen demand (COD). COD measures the amount of oxygen that is consumed by the water in the decomposition and oxidation processes, specifically the decomposition of organic matter and oxidation of inorganic matter, or chemicals. COD is an application that is usually used in industrial settings; however, municipalities treating wastewater with chemical pollutants may use it.

BOD & COD Reduction Technologies for Your Wastewater Applications:
Odor/Corrosion Control Chemical Products
Activated Carbon Adsorption
Anaerobic Wastewater Treatment Systems
Sequencing Batch Reactors (SBR)
Field Erected Biological Wastewater Treatment Plants

BOD & COD Reduction Video