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Abrasive liquids
An abrasive liquid contains substances, often minerals or inorganic substances, that are harder than the material they rub against. This abrasion will wear out and damage softer materials.
Aerobic
In wastewater transport and treatment aerobic means that oxygen is available and that it can be used as an oxidation agent in the degradation of organic matter.
Anaerobic
Anaerobic conditions under wastewater transport and treatment imply that neither nitrate, sulphate nor oxygen are present for the decomposition of organic matter.
Anoxic
Anoxic conditions, as for anaerobic conditions, indicate the absence of pure oxygen. However, compounds such as nitrate or sulphate can be present under anoxic conditions.
Backflow
The flow of piped medium in the direction opposite to normal flow is called backflow. It is caused by a difference in water pressures.
Baffle
The term baffle covers a flat board or plate, deflector vanes, guides, grids, gratings or similar devices constructed or placed in flowing water, wastewater or slurry systems.
Biofilm
Biofilm refers to a population of various micro-organisms trapped in a layer of slime and organic matter that attaches itself to the surfaces of pumps, pipes, walls etc.
BOD (Biochemical Oxygen Demand)
The quantity of oxygen consumed by aerobic microorganisms during the decomposition of organic matter in a water sample is defined as the Biochemical Oxygen Demand (BOD).
Brackish water
Brackish water is water that has more salinity than fresh water, but not as much as seawater.
Channel impeller
A channel impeller works directly on the pumped liquid with the liquid passing through the impeller itself. A channel impeller can be described as a closed, semi-open or open impeller.