Ontario Operator-in-Training (OIT) Practice Exam

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Study for the Ontario Operator-in-Training (OIT) Test. Use flashcards and multiple-choice questions for preparation, with hints and explanations for each. Get ready for your exam!

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What is the main objective of sludge treatment before final disposal?

To incinerate the sludge
To stabilize the sludge for low oxygen demand
To chemically destroy all pathogens
To transport it for recycling

The correct answer is: To stabilize the sludge for low oxygen demand

The main objective of sludge treatment before final disposal is to stabilize the sludge for low oxygen demand. Stabilization is a critical process that reduces the organic content of the sludge, making it safer for handling and disposal. This process involves the breakdown of organic matter and reduction of pathogens, which can lead to a significant decrease in the sludge volume and its potential impact on the environment. Stabilizing sludge also minimizes the risk of odor production and helps ensure that the remaining material can be managed more effectively, whether it's through land application, landfilling, or incineration. By achieving low oxygen demand, the treated sludge poses less risk to aquatic environments when eventually disposed of or recycled. While there are methods within sludge treatment that involve incineration, pathogen destruction, or transporting for recycling, the primary focus remains on achieving stabilization to ensure safety and environmental compliance.