Abstract: Various aspects of the subject technology relate to systems, methods, and machine-readable media for authenticating user accounts. The method includes authenticating at least one user account of a plurality of user accounts for lobbying into a session. The method includes generating at least one authenticated socket in a server for each authenticated user account. The method includes adding the at least one user account to the at least one authenticated socket. The method includes adding non-authenticated user accounts to non-authenticated sockets of a plurality of non-authenticated sockets. The method includes detecting network traffic flowing into the plurality of authenticated sockets and the plurality of non-authenticated sockets. The method includes disconnecting non-authenticated user accounts from the server when a threshold amount of suspicious and/or malicious network traffic is detected in a non-authenticated socket.

Abstract: In a sludge thickener, supernatant fluid is drawn off via peripheral ducts and oxygenated at a suitable location. The supernatant fluid is thereafter reintroduced into the thickener via diffusers distributed transversely of the thickener and intermediate the peripheral ducts. The generation of nauseating smells is thereby prevented, and an advantageous increase of the concentration of the sludges is attained.