You asked what I would do, so take this with a grain of salt, of course. I'm assuming that there may be some reuse of keywords, so what I would do is normalize the data (note that I am far from an expert in database design, but I found this article to be a pretty good introduction to the ideas of normalization) like so:

---------------------------------------------
|           meta_table_page_info            |
---------------------------------------------
| page_id | page | keyword_separator | desc |
---------------------------------------------

--------------------------
|        keywords        |
--------------------------
| keyword_id |  keyword  |
--------------------------

---------------------------
| page_to_keyword_mapping |
---------------------------
| page_id |  keyword_id   |
---------------------------
[download]

With this scheme, you'll put all the keywords you'll use for all the pages in the keywords table, the separator you want for each page in the keyword_separator column of the main table, and the mapping of keywords to pages in the third table. An example... say you have:

--------------------------------------------------------------
|                   meta_table_page_info                     |
--------------------------------------------------------------
| page_id |    page   | keyword_separator |        desc      |
--------------------------------------------------------------
|    1    | some_page |          ,        | some_description |
--------------------------------------------------------------

--------------------------
|        keywords        |
--------------------------
| keyword_id |  keyword  |
--------------------------
|     1      | keyword_1 |
|     2      | keyword_2 |
|     3      | keyword_3 |
--------------------------
[download]

and you want page 1 to have keywords "keyword_1,keyword_3". Then the mapping table would look like:

---------------------------
| page_to_keyword_mapping |
---------------------------
| page_id |  keyword_id   |
---------------------------
|    1    |       1       |
|    1    |       3       |
---------------------------
[download]

To build the actual string, you'd use a SQL statement in the vein of

SELECT m.keyword_separator, k.keyword 
  FROM keywords k, page_to_keyword_mapping p, meta_table_page_info m 
  WHERE p.page_id = ? AND m.page_id = p.page_id AND k.keyword_id = p.k
+eyword_id
[download]

Then you execute(page_number), and go from here. This may be far more complicated than you were wanting, but designing it like this leaves lots of room for expansion.