Here are the answers to your questions:
1) what action can husband take ?
Ans: The husband can immediately file a divorce petition praying for divorce.
2) can the wife ask for alimony from husband after quashing?
Ans: Yes, the wife can claim maintenance from husband by filing petition u/s 125 Cr.P.C./24 of HMA.
3)what consequences wife can face after quashing is done.
Ans: It depends on the mood of the husband.
4) can the husband ask for compensation from wife, if 498 a is quashed ?
Ans: No. However, the husband can file defamation suit against the wife and claim for damages for loss of reputation which might /might not work.