How do I separate workers into pools of jobs with delayed job + heroku?

My environment is rails 3.1, heroku bamboo stack, delayed_job_active_record, (https://github.com/collectiveidea/delayed_job ) and experimenting with hirefire. (https://github.com/meskyanichi/hirefire) - I can see the delayed_job queue documentation, but how do I apply this on heroku?My environment is rails 3.1, heroku bamboo stac