Common professional names of water treatment (164-180)

(164) Anaerobic ammonia oxidation. It refers to the biological reaction process in which anaerobic ammonia oxidizing bacteria use nitrite as an electron acceptor to oxidize ammonia nitrogen to nitrogen under anaerobic conditions.

(165) Add chlorine at the break point. NH₃-N in wastewater can be removed by using chlorine based oxidants (such as Cl₂, NaOCl) at an appropriate pH to oxidize it into chloramines (NH₂Cl, NHCl₂, NCl₃), which are then oxidized and decomposed into N₂ gas.

(166) Struvite method. It refers to the method of using magnesium ions, ammonium ions, and phosphate in water to form ammonium magnesium phosphate precipitation to remove ammonia nitrogen and total phosphorus.

(167) Biological phosphorus removal. It refers to the process of utilizing the excessive phosphorus uptake characteristics of polyphosphate accumulating bacteria to achieve phosphorus removal.

(168) Chemical phosphorus removal. It refers to the process of using phosphate ions to form precipitates with certain metal ions to remove phosphorus.

(169) Gasification phosphorus removal. It refers to the process of phosphate forming phosphine under the action of microorganisms.

(170) Drying of sludge. It refers to the process of removing most of the water content from sludge through filtration or evaporation.

(171) Anaerobic reactor. It refers to a specialized reactor designed for anaerobic treatment technology.

(172) Anaerobic granular sludge. It refers to the granular sludge produced by upflow anaerobic sludge beds and similar reactors, which is hollow and nearly circular, mainly composed of inorganic precipitates and extracellular polysaccharides. Multiple microorganisms living together can effectively remove pollutants from wastewater.

(173) Aerobic granular sludge. It refers to granular activated sludge formed by the self coagulation of microorganisms in an aerobic environment.

(174) MBR. Also known as membrane bioreactor, it is a new water treatment technology that combines membrane separation units with biological treatment units. Replace the secondary sedimentation tank with a membrane.

(175) Advanced oxidation. It refers to the process of oxidizing and degrading pollutants in wastewater that cannot be oxidized by ordinary oxidants by generating hydroxyl radicals.

(176) Hydroxyl radicals. It is an important reactive oxygen species, which is formed by the loss of an electron from hydroxide (OH-) in terms of molecular formula. Hydroxyl radicals have extremely strong electron donating ability, also known as oxidation ability, with an oxidation potential of 2.8v. It is the second largest oxidant in nature after fluorine.

(177) Evaporative crystallization. It refers to heating and evaporating a solvent, causing the solution to change from unsaturated to saturated, and continuing to evaporate. Excess solute will precipitate as crystals, which is called evaporative crystallization.

(178) Salt eating bacteria. It refers to a type of bacteria and microorganisms with specific physiological structures that can only survive in saline environments.

(179) Reclaimed water. It refers to the deep technical treatment of domestic sewage (or urban sewage) or industrial wastewater to remove various impurities, toxic and harmful substances and certain heavy metal ions that pollute water bodies, and then disinfect and sterilize them. The water body is colorless, odorless, clear and transparent, and meets or exceeds the national standard for miscellaneous water use (or relevant regulations). It is widely used in enterprise production or residential life.

(180) Zero emissions. It refers to the process of reusing industrial water and concentrating it into wastewater with high salt content and pollutants (over 99%) for recycling and reuse, or using a filter press to filter out insoluble substances and recycle them without any waste liquid being discharged from the factory.