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There are anti-odor floor drain cores on the market that can solve this problem.
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If it is the smell of the floor drain, only replace it with a little anti-odor floor drain, and if it is a basin drain, you can make the drain hose S-shaped, and then seal the hose connection with glass glue.
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You can put some activated charcoal that absorbs odors.
Installing a check valve will not solve the problem, because there will be hair, vegetable leaves and other substances in the water in your house, and the check valve cannot be completely closed, and can only turn the big leak into a small leak, which cannot completely solve the problem. It is also necessary to solve it from the sewage dredging, and it is recommended to find a solution to dredge the sewer.
Please refer to your question.
There was something unclean in it, and it was not washed down; It could also be that the sewers are running through and the people who live in the upper floors of your house get unclean and perishable things in.
It may be a rat woman, also called a tide bug, who prefers dark and damp places.
The drain and water outlet are all sealed and treated on the ground, and the plumber knows the method.