What is the common construction type for filter tanks?

• A. Concrete and rectangular
• B. Steel and cylindrical
• C. Wood and square
• D. Plastic and oval

Answer: (A)

The most common construction type for filter tanks is concrete and rectangular. This design choice is primarily due to the structural properties of concrete, which provide the necessary durability and strength to withstand the pressure of the water as well as the associated hydraulic forces. Additionally, rectangular shapes allow for more efficient use of space, making them easier to fit into the layout of water treatment facilities where space management is critical.

Concrete is not only robust but also resistant to corrosion and degradation from the chemicals often present in water treatment processes. This makes it a practical choice for filter tanks that are subjected to ongoing exposure to various substances. Furthermore, rectangular tanks can be designed with more straightforward inflow and outflow systems, enhancing their functionality and ease of maintenance.

Other materials and shapes, such as steel and cylindrical or plastic and oval, might be used in specific applications but are less common for general filter tanks. Steel, although strong, can be subject to corrosion unless properly treated, while plastic may not offer the same structural integrity required for larger-scale operations. Therefore, the rectangular concrete design remains the standard in the industry for filter tank construction.