When dosing chemicals in a storage tank to achieve proper mixing, which practice should be followed?

• A. Pour into the tank when the water is at the correct depth and ensure mixing
• B. Pour into the tank arbitrarily
• C. Never add chemicals to tanks
• D. Only add chemicals during maintenance shutdown

Answer: (A)

When adding chemicals to a storage tank, you want the chemical to be dispersed quickly and evenly throughout the water. Introducing it at a depth that allows the existing flow and any mixers or agitation to mix it thoroughly helps achieve a uniform concentration and the intended treatment效果. If the water is not at the proper depth, mixing can be incomplete, leading to pockets of high or low chemical levels and reduced effectiveness.

Dosing arbitrarily, never adding chemicals to tanks, or waiting only for maintenance shutdowns all fail to ensure proper distribution and continuous, effective treatment. The correct practice is to dose when the water is at the appropriate depth and take advantage of mixing to achieve even distribution.