Which statement is true of a standard intermittent sand filter?

Prepare for the OSSF Designated Representative Exam. Study with multiple choice questions and explanations to help you succeed. Get ready for the exam and ensure you're well-prepared to become a designated representative!

The statement regarding the maximum surface loading rate of 1.2 gallons per day per square foot as applicable to a standard intermittent sand filter is accurate. This loading rate is critical as it defines the efficiency and effectiveness of the filter in treating wastewater. A properly designed intermittent sand filter balances the flow of effluent through the sand media to promote effective filtration and biological treatment while preventing over-saturation and allowing for the aerobic treatment process to take place effectively.

In intermittent sand filters, the design relies on both physical and biological processes to treat the wastewater. The specified loading rate ensures that there is adequate time for the microbial communities present in the filter medium to effectively break down organic contaminants in the wastewater. This rate is crucial for maintaining the filter's performance and longevity.

Ensuring proper loading rates is essential because exceeding these rates can lead to poor treatment efficiency, potential clogging, and failure of the system. Therefore, option B accurately describes an important operational parameter of standard intermittent sand filters, contributing to their overall function in decentralized wastewater treatment systems.

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