Wcf hosted in winodws service for long running tasks

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WCF

self-host

I created WCF service and implemented my business functionality (i.e. assume image processing). To process it is taking around 10 minutes. My WCF services are hosted on IIS.

to avoid burden on IIS, i want to move my image processing logic to windows service with WCF (lets call ImageProcessingWCFService).

So from main WCF service i will do service call to ImageProcessingWCFService.

Now my question is how can i handle paraller processing for ImageProcessingWCFService service and ImageProcessingWCFService should be Async or should i use Queues.

Please suggest

Thanks

What I have tried:

I created WCF service and hosted on windows service but not able to achieve paraller processing.