Now in many news reports, some wastewater produced by food factories is directly discharged into the river, which is only a part, and the direct discharge is very small. What are the processes of wastewater produced in the actual production process, and where does the wastewater finally flow?

Direct exclusion is probably only done by those enterprises that are not very responsible. As for how to deal with it, Green Day Environmental Protection Bian Xiao explained to you:

Different factories have different wastewater sources and treatment methods. For example, automobile manufacturing can be divided into four processes: painting process, welding process, stamping process and assembly process, in which painting process is the main process to produce industrial wastewater, and various processes will produce industrial waste to varying degrees.