Which equipment is responsible for shredding material that is sometimes returned to wastewater?

The equipment that is responsible for shredding material that is sometimes returned to wastewater is indeed the comminutor. Comminutors are specifically designed to break down solid waste materials into smaller particles, making them easier to manage during the wastewater treatment process.

By reducing the size of organic and inorganic materials present in wastewater, comminuters help prevent clogging and damage in downstream treatment processes. This equipment greatly enhances the efficiency of the wastewater treatment facility by ensuring that larger solids do not interfere with pumps and other components essential for effective treatment.

Other equipment mentioned, such as grating screens, are used primarily for the purpose of filtering out larger objects from the wastewater stream. Disk screens are effective for separating materials based on size but do not shred or reduce the size of solids. Vortex grit chambers are designed to settle out heavier materials like sand and grit from wastewater but do not address the shredding or breakdown of solids. Thus, the comminutor uniquely fulfills the shredding function required in wastewater treatment.