Abstract: The present disclosure provides a concentric sloping plate enhanced vertical compact flotation unit, relates to the technical field of oily waste water treatment, and is mainly used for efficient treatment of oily waste water such as oilfield produced water, refining and chemical waste water and tanker ballast water. The compact flotation unit includes a tank, an oil receiving structure, a swirling inner cylinder, a swirl breaking structure, a flow equalizing structure, sloping plate sedimentation components and a center cylinder. An exhaust port is formed in the top of the tank, a slag discharge port is formed in the bottom of the tank, and the side surface of the tank is provided with an oil spill port, a water outlet pipe and a water inlet pipe.

Abstract: The present disclosure provides a vertical compact flotation unit with air stripping enhanced shallow sedimentation effect of spiral fins, and relates to the technical field of complicated treatment of oily waste water such as oil field polymer flooding produced water so as to give consideration to bubble utilization rate, operation energy consumption, structure compactness and installation and maintenance cost. The equipment includes a tank, an oil receiving structure, a swirling inner cylinder, a swirl breaking structure, sedimentation separation components and a center cylinder. An exhaust port is formed in the top of the tank, a slag discharge port is formed in the bottom of the tank, the side surface of the tank is provided with an oil spill port, a water outlet pipe and a water inlet pipe, and the water inlet pipe is tangentially connected with the swirling inner cylinder.

Abstract: A method and system for single-PDP dual-stack serial dialing is provided. A mobile terminal sets a single-PDP dual-stack serial dialing parameter according to a parameter setting command transmitted by a host; then the mobile terminal initiates a PDP activation request to a mobile communication network according to a first dialing instruction transmitted by the host and the configured single-PDP dual-stack serial dialing parameter, acquires activation response information fed back by the mobile communication network, generates dialing response information according to the activation response information, and feeds back the dialing response information to the host, wherein the dialing response information includes cause reference information. And after receiving the dialing response information, the host can acquire a specific condition of the current mobile network according to the cause reference information included in the dialing response information to determine a dialing mode.

Abstract: a method and system for single-PDP dual-stack serial is provided. A mobile terminal sets a single-PDP dual-stack serial dialing parameter according to a parameter setting command transmitted by a host; then the mobile terminal initiates a PDP activation request to a mobile communication network according to a first dialing instruction transmitted by the host and the configured single-PDP dual-stack serial dialing parameter, acquires activation response information fed back by the mobile communication network, generates dialing response information according to the activation response information, and feeds back the dialing response information to the host, wherein the dialing response information includes cause reference information; and after receiving the dialing response information, the host can acquire a specific condition of the current mobile network according to the cause reference information included in the dialing response information to determine a dialing mode.