You can use aquaponics; the ...

You can use aquaponics; the plants in an aquaponics system will see your nitrates as "fertilizer", and clean them out of the water. You'll then have to put the water through a secondary process to get any bacterial contamination out, but this will solve your first problem.

For more, see http://www.friendlyaquaponics.com/ for tons of free information about what aquaponics is, what it does, and what it costs.

Aloha, Tim............