Acidic iron-containing wastewater recycling system and method for carrying out in situ modification by system

Abstract

The invention discloses an acidic iron-containing wastewater recycling system comprising a pickling wastewater storage pool, wherein the pickling wastewater storage pool is connected with a neutral oxidation reaction tank through a raw water acid proof pump, and a stirrer, a 1# online pH meter and a 1# online ORP (oxidation reduction potential) meter are fixed in the neutral oxidation reaction tank; an alkali liquor storage tank is connected with the neutral oxidation reaction tank through a 1# metering pump; a flocculant storage tank is connected with the neutral oxidation reaction tank through a 2# metering pump; the neutral oxidation reaction tank is connected with a settling tank through a slurry pump, the settling tank is connected with a sludge concentration tank, and a supernatant drain pipe is further connected to the settling tank; the sludge concentration tank is connected with a high pressure plate frame filter press through a high pressure slurry pump; and the neutral oxidation reaction tank is further connected with a blower. The invention further discloses an in situ modification method for treating wastewater by the acidic iron-containing wastewater recycling system. By adopting the acidic iron-containing wastewater recycling system disclosed by the invention, more than 55% of Fe3O4 can be stably prepared and recycled through in-situ reaction in an acidic wastewater neutralization tank under normal temperature and normal pressure conditions.

Description

technical field

[0001] The invention belongs to the technical field of waste water treatment, and in particular relates to an in-situ reformation method of a waste water treatment process, which uses iron and steel acid waste water treatment to efficiently recover black iron-containing sludge. Background technique

[0002] At present, iron and steel processing enterprises produce a large amount of rinsing wastewater during the pickling process, and the main component of the wastewater is FeCl with an acidic pH value ≦ 2 2 or FeSO 4 When the wastewater is in contact with the air in nature, it is oxidized by the air to form trivalent iron salt precipitation, causing the effluent to be turbid. Generally, the method of acid wastewater treatment in steel mills in my country is usually to first remove Fe 2+ Oxidation to Fe 3+ Afterwards, the neutralization reaction is used to form Fe(OH) 3 Precipitation, coexist with the rest of the heavy metal ions and then enter the water fo...

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