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The present application relates to the field of edible oil quality monitoring, and particularly relates to an online edible oil quality monitoring system and method based on a multi-modal sensor, which extracts the pressing state characteristics of the outflowing oil liquid corresponding to the pressing process; calculates the pressing quality representation value of the outflowing oil liquid to mark the outflowing oil liquid; further evaluates and analyzes the quality of the outflowing oil liquid; extracts the flow disorder characteristics of the outflowing oil liquid in the entire pressing process to determine whether it meets the flow deviation fault tolerance requirement; according to the splashing height of the outflowing oil liquid entering the oil receiving container, in combination with the retention time and accumulation area of the foam in the oil receiving container, the quality deviation representation coefficient of the corresponding crude oil product is evaluated, the quality deviation level is determined, the corresponding color is marked, and a warning prompt information is sent. The present application realizes multi-dimensional and comprehensive edible oil quality monitoring by real-time online monitoring, timely discovery of edible oil production abnormalities, and improvement of monitoring accuracy.

The invention discloses an oil-containing wastewater demulsifier and a preparation process thereof.The oil-containing wastewater demulsifier comprises a component A, a component B and a component C. The component A is sodium dodecyl benzene sulfonate, the component B is ethylenediaminetetraacetic acid, the component C is sodium hydroxide, polyvinyl alcohol and a cross-linking agent, the sodium dodecyl benzene sulfonate is used for conducting reverse-phase treatment on foam of oil-containing wastewater, and the cross-linking agent is used for conducting cross-linking treatment on the foam of the oil-containing wastewater. The ethylenediamine tetraacetic acid can increase the viscosity of a solution, can promote separation between oily substances and water molecules in foams, enables the foams in the oil-containing wastewater to be broken, can promote bonding among the water molecules, and can promote foam degradation and layering of the oily substances and water, so that the blocking effect of the foams in the oil-containing wastewater on the wastewater treatment agent is solved; after the sodium hydroxide is added, charges on the surfaces of the oil drops change, and the polyvinyl alcohol interacts with the surfaces of the oil drops through hydroxyl groups on molecular chains of the polyvinyl alcohol, so that electrostatic repulsion among the oil drops can be reduced, the oil drops are gathered, and the oil-water separation efficiency is improved.