Batch and continuous are the two Platonic ends of the process design spectrum. “Batch” means all processing and treatment is done to a given mass of waste together. No new waste introduced until the process is complete. The batch process may take place at one physical location or the waste mass may be moved between process steps. "Continuous" means new waste is entering the process as treated waste exits; each bit of waste in the process has received a different amount of treatment from the other bits. Very large industrial processes are often continuous - oil refineries, sewage treatment, paper plants. These can be very efficient processes. Batch processes are more often employed for smaller quantities of materials and for which continuous operations are not feasible. Of course, no process is purely continuous and often a system is "fired up" to create, modify, or treat a given mass of material; this is sometimes called "batchwise continuous" processing.
Medical waste treatment is usually batch.
Is medical waste treatment inefficient?
Yes, probably, but mostly because too much waste is classified as infectious. This is caused largely because the people who manage medical waste err on the side of safety The process of treatment – usually heat treatment/incineration is not necessarily inefficient.