Waste digestion system, advanced

Figure 6. Advanced biomass-waste digestion system...

Segmented worms have much more advanced digestive systems than flatworms do. A flatworm has one opening, a mouth, for food and wastes. A segmented worm has two openings, a mouth at one end and an anus at the other. The mouth opens to an esophagus that leads to a muscular pharynx. 

In the early 1980s, there was a large increase in the number of commercial anaerobic digestion plants constructed in the United States, particularly advanced technology systems for industrial wastes (c/. Klass, 1983). Several of the new digesters were of the fixed-film or upflow sludge blanket types. Full-... 

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