Packed bed is the most common form of wet scrubber odor control. How is this accomplished?

The answer to this question is C, the common packed bed wet scrubber system uses chemical absorption for odor control. It differs from the chemical mist scrubber by using packing material in the contact chamber and the recirculation of the scrubbing chemicals. It is advantageous due to very efficient mass transfer and easily handles changes in odorous concentrations. The biggest disadvantage is the high maintenance requirements. There are many different methods of odor control and the main goal is to maintain a good relationship with the population near-by the treatment plant. Understanding the options is a good tool for the wastewater operator in plant operations and troubleshooting.

How does ion exchange treatment help reduce the development of disinfectant by products?

The correct answer is B, magnetically charged beads, fed as a slurry, allow dissolved organics to adhere and settle out. The ion exchange treatment process is mostly used to reduce hardness, arsenate and/or nitrate. However, ion exchange treatment process can also be used to reduce the development of disinfectant by products by feeding small-sized beads as a slurry into a mixing stage. The suspended beads provide large surface areas for organics to adhere, which results in rapid settling downstream. This particular ion exchange process is called magnetic ion exchange resin (MIEX)