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I have some advice from my daughter and son in law, the chemical engineer, to add a vacuum relief valve to the top of my capped off riser. It allows air to fill the riser to allow air to break the siphon activity. What do you think?

I have a picture posted in my first comments. The riser is 8 inches above the trap but capped off at the top. I could install a taller riser , that extends to the nearly the top of the sink with a small opening for air (a psuedo air gap). There is a non-return valve ( a steel ball) in my Miele...

After a new sink install (sink has one drain) , my plumber told me he couldn't connect my dishwasher drain hose to my disposal because of a change in code. So he added a second trap and connected the dishwasher drain to it. But now I have dirty water filling my dishwasher. Over a couple days...