CI pass array to model where clause

$this->db->where_in( 'row_id', array('1','2','3') );

Hello dear,

I am stuck in a condition.

I have array of keywords like array('business','permanent')

now can you please tell me how to pass this array into where clause
because where_in is only valid for ids(integers)

and when i am using the below statement it through error

$this->db->where('Keyword',array('business','permanent')) ;
or
$this->db->or_where('Keyword',array('business','permanent')) ;
or
$this->db->or_where(array('business','permanent')) ;


Please help
Thank you.