Common professional names of water treatment (145-163)

(145) Aeration. It refers to a means of bringing air into strong contact with water. Its purpose is to dissolve oxygen in the air into water, or to expel unwanted gases and volatile substances from water into the air.

(146) Oxygenation rate. It refers to the ability of aerators to supply oxygen to liquids in wastewater treatment, which is called oxygenation capacity, measured in kg/(m3·h) [10 ℃ or 20 ℃, 101.3kPa). The oxygenation capacity of liquids per kilowatt hour is called oxygenation efficiency.

(147) Push flow activated sludge process. The sewage flows evenly, and the wastewater enters from the head of the pool and flows out from the tail of the pool, without mixing the front and rear streams.

(148) Sequential batch activated sludge process. It refers to an activated sludge wastewater treatment technology that operates in an intermittent aeration mode. Its main feature is orderly and intermittent operation during operation.

(149) Microscopic examination. It refers to the process of sampling and preparing specimens for examination, observing, analyzing, and judging them under a microscope.

(150) Native organisms. It refers to the lowest class of eukaryotic unicellular animals in the animal kingdom, consisting of individual cells.

(151) Postnatal organisms. The general term for all animals other than protozoa (subphylum of metazoa).

(152) Non filamentous bacteria swell. It refers to the swelling caused by the accumulation of highly viscous substances (such as glucose, mannose, arabinose, xylose, and deoxyribose) in bacterial colonies.

(153) Filamentous bacteria expand. It refers to the expansion of filamentous bacteria in activated sludge caused by the proliferation of a large number of filamentous bacteria.

(154) Peroxidation. It refers to the continued oxidation reaction of microorganisms when there is sufficient oxygen but insufficient nutrients, such as carbon sources in wastewater.

(155) External respiration. Under normal circumstances, microorganisms utilize externally supplied energy for respiratory metabolism, which is called exogenous respiration.

(156) Endogenous respiration. If there is no external energy supply, but instead uses the stored energy substances within oneself for respiratory metabolism, it is called endogenous respiration.

(157) Ageing. It refers to the phenomenon of sludge disintegration caused by long sludge age, prolonged low load, or peroxidation.

(158) Excess sludge. It refers to the activated sludge discharged from the secondary sedimentation tank (or sedimentation zone) outside the system in the activated sludge system.

(159) Ammonification. It refers to the process in which nitrogen-containing organic compounds such as proteins and urea are decomposed by microorganisms and converted into ammonia.

(160) Nitrification. It refers to the process of ammonia being oxidized to nitric acid by microorganisms.

(161) Denitrification. It refers to the biochemical process in which bacteria reduce nitrogen (N) in nitrate (NO3-) to nitrogen (N2) through a series of intermediate products (NO2-, NO, N2O).

(162) Short range nitrification and denitrification. Short range nitrification refers to the production of nitrite from NH3 and the cessation of nitrate production. The direct generation of N2 from nitrite is called short-range denitrification.

(163) Simultaneous nitrification and denitrification. Nitrification and denitrification reactions often occur under the same treatment conditions and in the same treatment space, therefore, these phenomena are called synchronous nitrification/denitrification (SND).