What are the wooden planks used to scrape sludge from the bottom of a tank called?

The wooden planks used to scrape sludge from the bottom of a tank are referred to as "flights." In sewage treatment processes, flights are instrumental in moving sludge effectively within a tank, typically in a clarifier or sedimentation tank. They are designed to aid in the removal of settled solids, ensuring that the tank operates efficiently and meets treatment goals.

Understanding their function is vital. Flights typically lay flat against the tank bottom, and as they either rotate or move in a linear fashion, they effectively scoop and transport the sludge to specific areas for further processing, such as removal for anaerobic digestion or disposal. This action is crucial in maintaining water quality and facilitating the overall sewage treatment process.

In contrast, terms like "cleats," "rails," and "levers" refer to various components and tools used in different contexts but are not specifically associated with the scraping action of sludge within a tank. Cleats might refer to ridges or projections that assist in traction, rails usually refer to guiding structures, and levers are mechanical devices for lifting or moving objects but do not perform the specific function of scraping sludge.