What is Biochemical Oxygen Demand (BOD)?

Biochemical Oxygen Demand (BOD) is the amount of dissolved oxygen that aerobic biological organisms need to break down organic material present in water. BOD is stored in the cell as a polysaccharide. If this type of growth is excessive, it can lead to slime bulking and settling problems at wastewater treatment plants. It can also lead to foaming problems.

Treatment systems often require supplemental carbon as a food source plus nitrogen and phosphorus to maintain a healthy microbial community during production stoppages or as a readily available substrate during start-ups. An established microbial community prefers a steady stream of food, but some production facilities may not run continuously. During downtimes, the microbial community can starve if insufficient BOD is available. Nutrient products, like BioAid®, can help supplement nutritionally poor wastewater and balance the BOD at wastewater treatment plants.


BioAid® nutrient products are ideal for wastewater treatment plant applications. They provide readily-available nutrients in forms that bacteria can utilize and are blended in ratios that help to achieve optimal growth rates. BioAid® nutrients help improve treatment efficiency and improve effluent quality in nutrient-deficient wastewater systems.

Novozymes’ BioAid® products are designed to enhance the microbial community by ensuring that sufficient nutrient levels are present. This enhances the activity and characteristics of the microbial community. When applied together with Novozymes biological products, BioAid® also accelerates system performance and recovery.

Better and safer cleaning

Learn more about BioAid®

BioAid® provides supplemental nutrients for enhanced biological growth in nutrient-deficient or BOD-limited waste streams at wastewater treatment plants.

BioAid® benefits

  • Source of nitrogen and phosphorus in a form readily available to bacteria
  • Source of highly-concentrated and readily degradable carbon
  • Can be used as a food source during turnarounds and process disruptions


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