Which statement best describes the impact of the food industry on a wastewater treatment plant?

• A. Low BOD and low nutrient load
• B. No effect on treatment processes
• C. High BOD, total nitrogen, TSS, phosphorus and varying pH; pretreatment or equalization may be needed
• D. Only phosphorus needs to be removed

Answer: (C)

Food industry discharges can be very strong and variable, bringing large amounts of organic matter, nutrients, suspended solids, and fluctuating pH to a plant. This kind of wastewater can create shock loads that disrupt biological treatment, cause odor and settling problems, or lead to effluent violations if treated all at once. Pretreatment helps remove troublesome substances before they reach the main plant, and equalization basins smooth out flow and strength so the downstream treatment processes can operate consistently. So a statement that emphasizes high BOD, total nitrogen, TSS, phosphorus, and varying pH, with a note that pretreatment or equalization may be needed, accurately reflects how the food industry impacts a wastewater treatment plant. The other options don’t fit because they either underestimate the strength and variability of food wastewater, deny any effect on treatment, or prematurely limit removal to phosphorus only.