Treatment system and method for pickling wastewater
A technology of pickling wastewater and treatment system, applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of difficult separation, pollution of water environment, waste of precious resources, etc.
Active Publication Date: 2021-07-30
航天环保(北京)有限公司
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Problems solved by technology
Pickling wastewater contains iron, chromium, nickel, chlorine, fluorine and other inorganic pollutants. If it is discharged directly without treatment, it will seriously pollute the water environment and waste a lot of precious resources.
The treatment of pickling wastewater mainly includes: neutralization oxidation method neutralization oxidation method is to use sodium carbonate, sodium hydroxide, limestone and lime to neutralize hydrochloric acid and sulfuric acid pickling wastewater. The ferrous ions in the washing wastewater react with alkali and oxidize to trivalent to form a precipitate (sludge) mainly composed of ferric hydroxide. However, the sludge mainly composed of ferric hydroxide is large and difficult to separate by physical methods.
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[0023] figure 1 It is a schematic diagram of the composition of the treatment system for pickling wastewater provided by the first embodiment of the present invention, as figure 1 As shown, according to one embodiment of the present invention, the treatment system of pickling wastewater includes a pickling wastewater storage tank 1, a closed reaction tank 2, a separator 3, and an alkali addition tank 4, wherein, in the closed reaction tank 2, the pickling wastewater is The pickling wastewater containing ferrous ions introduced by the storage tank 1 reacts with the alkaline slurry introduced from the alkali addition tank 4 to generate oxide slurry containing iron, and the pickling wastewater containing ferrous ions includes But not limited to ferrous sulfate (FeSO 4 ), ferrous chloride (FeCl 2 ), Fe 2+ The ion concentration is preferably 400-1000mg / L, and the alkali includes one of the following substances: slaked lime, quicklime and sodium hydroxide; the oxide slurry contai...
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A system and method for treating pickling wastewater, the system includes a pickling wastewater storage tank (1), a closed reaction tank (2), a separation tank (3), and an alkali addition tank (4), wherein, in the closed reaction tank (2 ), the pickling wastewater containing ferrous ions introduced from the pickling wastewater storage tank (1) reacts with the alkaline slurry introduced from the alkali addition tank (4) to generate oxide slurry containing iron, which contains The iron oxide slurry is introduced into the separator (3) for solid-liquid separation, so as to separate the oxides containing iron, which is characterized in that it also includes a vacuum pump, the separator is a magnetic separator, and the vacuum pump is connected to The closed reaction tank (2) is used to extract the air in the closed reaction tank (2) so that the pickling wastewater of ferrous ions and the alkaline slurry react under anaerobic conditions, thereby at least producing ferric oxide, The mixture containing ferric oxide is separated by a magnetic separator. The invention provides a treatment system and method capable of converting ferric ions in pickling wastewater containing ferrous ions into ferric oxide, which is convenient for subsequent physical separation.
Description
technical field [0001] The invention relates to a treatment system and method for pickling wastewater, in particular to a treatment system and method for recycling heavy metals in wastewater and effectively reusing resources. Background technique [0002] As we all know, pickling wastewater from the iron and steel industry has always been designated as a dangerous pollutant and it is strictly forbidden to discharge it into natural water bodies without treatment. Pickling wastewater contains iron, chromium, nickel, chlorine, fluorine and other inorganic pollutants. If it is discharged directly without treatment, it will seriously pollute the water environment and waste a lot of precious resources. The treatment of pickling wastewater mainly includes: neutralization oxidation method neutralization oxidation method is to use sodium carbonate, sodium hydroxide, limestone and lime to neutralize hydrochloric acid and sulfuric acid pickling wastewater. The ferrous ions in the wash...
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IPC IPC(8): C02F1/48C02F1/52C02F101/20
CPCC02F1/484C02F1/488C02F1/5236C02F2101/203
Inventor 荚长军荚欣雨刘丽萍
Owner 航天环保(北京)有限公司