Abstract: Disclosed in the present invention is a generative event extraction method based on ontology guidance, including: (1) constructing an event ontology knowledge base; (2) designing an event trigger word extraction template and an event argument extraction template; mapping an input event text to a first input sequence, and mapping an input event text integrating an event ontology to a second input sequence; (3) designing a class label mapping function that maps multi-word labels to event types and/or role types; (4) extracting the event ontology corresponding to the input event from the event ontology knowledge base, and constructing the first input sequence and the second input sequence according to the event trigger word extraction template and the event argument extraction template; and (5) predicting, by the event extraction model, the event type and the role type according to the class label mapping function and a processing mechanism thereof, and outputting an event trigger word span and an event argument

Abstract: A method for phosphorus removal and recovery using an organic carbon source of urban sewage, including: first filling a biofilm reactor with sewage; stirring under anaerobic conditions, phosphorus being released from a polyphosphate biofilm using an organic carbon source in the sewage; discharging a portion of the sewage after the aforementioned treatment into a recovery tank and storing same as a recovery liquid; performing aerobic aeration on the remaining part of the sewage after anaerobic treatment, such that phosphorus is absorbed by the polyphosphate biofilm until the concentration of phosphorus reaches a requirement for discharge; turning off the aeration device and discharging the sewage; returning the recovery liquid to the biofilm reactor, simultaneously adding sewage to fill the reactor, and repeating the aforementioned steps multiple times; and obtaining a phosphorus recovery liquid when the concentration of phosphorus in the recovery liquid reaches the requirements for a phosphorus recovery proce