I would definatly consider ozone as an alternative. In the degassing of odors at wet wells/ collection stations it is a natural. The use on scrubbers has also been done. For more information go to our web site at www.trio3.com
How are you injecting the ozone? We recently constructed a machine to inject ozone into the ground, but as you are aware the organics are troublesome. Have you tried ozone/UV?