Abstract: A blower casing having an inlet in a side wall thereof and having an outlet in an upper portion of a peripheral wall thereof, and an impeller to rotate within the blower casing take in a composite including solid resin through the inlet and throw the solid resin radially outward and toward the outlet, are included. Multiple crushing blades each of which is in the form of a saw blade are arranged at intervals on an inner peripheral surface of the peripheral wall of the blower casing, the multiple crushing blades being configured such that the solid resin is crushed by collision with the multiple crushing blades.

Abstract: An object of the invention is to provide a wastewater treatment system using a superconducting magnetic separator that can wash the magnetic filter efficiently. The system comprises in a bore of a superconducting magnet a removably built-up multiunit magnetic filter consisting of a plurality of single-unit magnetic filters. The multiunit magnetic filter has a total longitudinal length at least equal or greater than that of the superconducting magnet. During excitation of the superconducting magnet, a single-unit magnetic filter is removed from the upstream side (sewage side) of the multiunit magnetic filter by pushing in another single-unit magnetic filter from the downstream side (clean water side), and washed and returned to the downstream side again.