Which term refers to a solid product produced by wastewater treatment that can be recycled?

• A. Biosolids
• B. Biomass
• C. CBOD
• D. Chlorination

Answer: (A)

Biosolids are the solid material left after wastewater treatment that can be recycled. After the wastewater goes through treatment, the solids are thickened and stabilized (often with digestion) to reduce pathogens and odors, then dewatered to become a manageable solid product. These stabilized solids can be reused as fertilizer or a soil conditioner under regulatory standards. This distinguishes biosolids from other terms: biomass refers to general living matter, CBOD is a measure of the wastewater’s oxygen demand, and chlorination is a disinfection step, not a recycled solid product.