A Type A dispersal bed receives effluent from what class of treatment unit?

A Type A dispersal bed receives effluent from what class of treatment unit?

• A. Class I treatment unit
• B. Class II treatment unit
• C. Class III treatment unit
• D. Class IV treatment unit

Answer: (D)

Type A dispersal beds are designed for effluent that has undergone a higher level of treatment. In on-site systems, the class of treatment unit indicates how much cleanup the wastewater has received before it enters the soil absorption area. A Type A bed relies on the higher-quality effluent produced by the most advanced treatment unit (Class IV). This higher treatment level means lower levels of solids, BOD, and pathogens, which helps prevent clogging of the bed and ensures reliable absorption in soils that may be sensitive or have limited percolation. If the effluent came from less advanced treatment units, the bed could clog more quickly and performance would decline, so those combinations are used with other bed types designed for lower-efficiency effluent.

Type A dispersal beds are designed for effluent that has undergone a higher level of treatment. In on-site systems, the class of treatment unit indicates how much cleanup the wastewater has received before it enters the soil absorption area. A Type A bed relies on the higher-quality effluent produced by the most advanced treatment unit (Class IV). This higher treatment level means lower levels of solids, BOD, and pathogens, which helps prevent clogging of the bed and ensures reliable absorption in soils that may be sensitive or have limited percolation.

If the effluent came from less advanced treatment units, the bed could clog more quickly and performance would decline, so those combinations are used with other bed types designed for lower-efficiency effluent.