Although you state awk is not a possibility - for the sake of completeness:

awk -F',' '$9>1' input.csv 

This will instruct awk to consider , as field separator and print only lines where field 9 has a value larger than 1.

Although you state awk is not a possibility - for the sake of completeness:

awk -F',' '$9>=1' input.csv 

This will instruct awk to consider , as field separator and print only lines where field 9 has a value equal or larger than 1.