Screening and comminution are preliminary treatment processes. a) True b) False?

Answer:

Introduction:
Screening and comminution are two important processes in the field of wastewater treatment. These processes are performed as part of the preliminary treatment stage, which aims to remove large solid particles and break down larger solids into smaller, more manageable pieces. In this response, we will discuss the true nature of screening and comminution as preliminary treatment processes.

Screening as a preliminary treatment process:
Screening is the process of removing large solids from wastewater by passing it through a screen or mesh. It is typically the first step in the preliminary treatment process. The purpose of screening is to remove objects such as rags, sticks, trash, and other debris that can clog or damage downstream equipment and processes. The screens used in this process have varying mesh sizes, allowing the wastewater to pass through while retaining the larger solids. Screens can be manually or mechanically cleaned, depending on the design of the treatment facility.

Comminution as a preliminary treatment process:
Comminution is the process of reducing the size of solid particles in wastewater. It involves the use of mechanical forces such as grinding, crushing, or shearing to break down larger solids into smaller, more manageable pieces. The purpose of comminution is to increase the surface area of the solids, making it easier for further treatment processes such as sedimentation, flotation, or biological treatment to occur. Comminution can be achieved through various methods, including the use of grinders, shredders, or macerators.

Conclusion:
In conclusion, screening and comminution are indeed preliminary treatment processes in wastewater treatment. Screening helps to remove large solids and debris, while comminution breaks down larger solids into smaller particles. These processes are essential in the preliminary treatment stage to ensure the smooth operation of downstream treatment processes and protect equipment from damage or clogging.