Like our teeth, placoid scales have an inner core of pulp (made up of connective tissues, blood vessels, and nerves), which is covered by a layer of dentine (hard calcareous material). This dentine is covered by enamel-like vitrodentine.Scales in bony fish grow as the fish gets larger, but placoid scales stop growing after they reach a certain size, and then more scales are added as the fish grows.his dentine is covered by enamel-like vitrodentine. Scales in bony fish grow as the fish gets larger, but placoid scales stop growing after they reach a certain size, and then more scales are added as the fish grows.
Wet air oxidation is a promising technology for the treatment of refractory organic pollutants in the effluent from various industries in view of high pollutant removal efficiency at mild conditions and environmental friendliness not involving any harmful chemical reagent.
Plan involves water reclamation and reuse at one of the largest scales put into use. Reclaimed water, irrigation, pathogens, oxidation ponds, activated sludge, circular system treatment. Water reclamation and reuse is a growing technology. â âReclaimed waterâ is defined as effluent derived in any part from sewage that has been adequately and reliably treated to a high quality so that it is suitable for beneficial usesâ (Access Washington, 2005). There are different methods of water reclamation and reuse currently being used by different facilities. âMunicipal wastewater treatment systems are typically