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| trickling filter; bacterial bed | |||
| percolating filter; biological filter; bacterial bed A device that removes some suspended solids from sewage. Air and bacteria decompose additional wastes filtering through the sand so that cleaner water drains from the bed | |||
| percolation filter; sprinkling filter | |||
| biofilter | |||
| dripper; trickle filter; trickling biofilter | |||
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| biological purification body | |||
| lit bactérien: 28 phrases in 6 subjects |
| Chemistry | 1 |
| Construction | 2 |
| Engineering | 1 |
| Environment | 11 |
| Medical | 1 |
| Natural resourses and wildlife conservation | 12 |