How Enzymes Can Improve Wastewater Treatment
Enzymes help break down organic matter in wastewater, supporting more efficient treatment. In this presentation, Dr. Clifford Fedler explores how enzymes can reduce odors and sludge, improve treatment performance, and help municipalities and operators evaluate potential operational and cost benefits.
Enzymes in Wastewater | Frequently Asked Questions
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Microorganisms play a central role in wastewater treatment, but complex organic materials can be difficult for them to break down. Enzymes help by converting these materials into smaller molecules that microorganisms can more readily consume. They support the biological treatment process, helping it break down organic matter more efficiently and completely.
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Dr. Fedler identifies reduced odors and better flow properties among the potential benefits of enzymes. Certain enzymes also target fats and grease. Lipase, for example, breaks fats into fatty acids and glycerol that microorganisms can consume. Understanding these functions can help operators evaluate how enzymes might address common treatment and collection system challenges.
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Sludge disposal is a common operational challenge. The presentation highlights reduced sludge volume and better settling as potential benefits of enzymes. By helping microorganisms break down organic matter more completely, enzymes may help reduce the material left to manage and support more effective solids handling.
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The type matters because enzymes target specific materials. Lipase breaks down fats, protease targets proteins, amylase acts on starch, and cellulase breaks down cellulose found in plant material. Understanding what is in your wastewater helps inform which enzymes may be relevant. Their performance and lifespan also depend on operating conditions, including temperature and pH.
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Dr. Fedler presents an economic example with a benefit-to-cost ratio of 1.9, representing $1.90 in benefits for every $1 in costs under the stated assumptions. The example uses a plant capacity of one million gallons per day, a 20-year analysis period, a 7% interest rate, and an enzyme product cost of $40 per gallon. It provides a starting point for evaluating potential value, with a facility-specific assessment needed to determine how the economics apply to your system.
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A copy of the presentation can be found here.
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