Which analysis among the following is used to reduce vector attraction in Class B sludge?

• A. Metals
• B. Vector attraction reduction
• C. Pathogen densities
• D. Nutrients (N&P)

Answer: (B)

Vector attraction reduction is the process that makes Class B biosolids less attractive to vectors such as flies and rodents by stabilizing the sludge and cutting down on odors, moisture, and available nutrients. Achieving this reduction involves stabilization steps like digestion, lime stabilization, composting, or other treatment that lowers what attracts pests. Metals content, pathogen densities, and nutrients are important quality attributes for other regulatory purposes, but they do not, by themselves, reduce vector attraction. So the analysis focused on demonstrating that the sludge has been stabilized enough to deter vectors is what controls Class B status.