Concrete Canoe. The Greek polymath Archimedes is said to have solved the mystery of buoyancy in a bathtub. Even if the story is apocryphal, his principle isn't: If an object weighs less than the water it displaces, it won't sink. Even concrete can float. Materials scientist Joseph-Louis Lambot built a concrete dinghy featured in the 1855 World's Fair.
Definition of BIOFILTER. : a filter bed in which sewage is subjected to the action of microorganisms that assist in decomposing it. ADVERTISEMENT. 2bi- + filter.rigin of BIOFILTER. 2bi- + filter. This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis.
Thus, there must be a balance between a high SSA and an operationally reliable biofilter media. Nitrifying bacteria cells grow on all surfaces of the biological filter media and, in fact, on all wet surfaces of the system, such as the insides of pipes, tank walls, etc. Water quality parameters should be monitored regularly during the start-up of a biofilter. 2  Ammonia, nitrite, pH, temperature and alkalinity are the primary water quality parameters to test. 3  Reliable, accurate and repeatable methods for measuring ammonia and nitrite concentrations in the system should be established.