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

A waste water recovery and treatment system technology, applied in metallurgical waste water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as unreliable process, difficult control, cumbersome process, etc., and achieve energy saving Low energy consumption, simple process and high degree of automation

Active Publication Date: 2015-01-14
WUXI XINDU ENVIRONMENTAL PROTECTION EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Purpose of the invention: the present invention aims at the following problems in the known technology: the process of neutralizing and recovering black ferric oxide particles from acidic iron-containing wastewater in steel mills is relatively cumbersome, difficult to control, unreliable in process, and high in energy consumption, etc., and provides an acidic iron-containing wastewater Wastewater recycling system

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Step 1: Use an acid-resistant pump to drive the acidic wastewater into the oxidation neutralization reaction tank, add lime to neutralize the acid and alkali to a pH of 9.5, and the solution turns dark green.

[0073] Detect the ORP value of the iron and steel acid wastewater to be treated, and its ORP is -730mv, then it can be judged that the Fe content in the iron-containing acid wastewater is 2+ The molar ratio to Fe>0.65 means acid wastewater mainly composed of Fe2+, which is light green acid wastewater.

[0074] Step 2: a. Air is passed into the acidic wastewater of iron and steel to carry out oxidation reaction to it, and Fe 2+ The consumption rate is 80g / L.h, and the air intake intensity is 0.03m 3 / h, the aeration time is 20min, and the pH value is maintained at about 9.5 during the oxidation reaction;

[0075] b. When the ORP is detected to reach -670mv, the oxidation reaction is considered to be over, the air intake is stopped, and the color of the solution ...

Embodiment 2

[0079] Step 1: Detect the iron and steel acid wastewater to be treated. Add lime to neutralize the acid and alkali, and adjust the pH of the iron and steel acid wastewater to 10; 2+ The molar ratio to Fe>0.65 means the acidic wastewater mainly composed of Fe2+, which is light green acidic wastewater. The acidic wastewater is pumped into the oxidation neutralization reaction pool by an acid-resistant pump.

[0080] Step 2:

[0081] a. Oxygen is introduced into the acidic wastewater of iron and steel to carry out the oxidation reaction, and Fe is controlled during the oxidation reaction. 2+ The consumption rate is 100g / L.h, and the air intake intensity is 0.03m 3 / h, the aeration time is 20min, and the pH value is maintained at 10 during the oxidation reaction;

[0082] b. When the ORP is detected to reach -680mv, the oxidation reaction is considered to be over, the air intake is stopped, and the color of the solution turns completely black;

[0083] c. Add Fe-containing wast...

Embodiment 3

[0086] Step (1): First adjust the pH of acidic iron and steel wastewater to about 9.7, then detect the ORP value of the acidic iron and steel wastewater after adjustment, and its ORP is -560mv, then it is known that Fe 2+ Molar ratio to Fe <0.45;

[0087] Step (2):

[0088] a. will contain Fe 2+ Add the mud into the iron and steel acid wastewater, stir at a speed of 100rpm / min for 50s, and maintain the pH at about 9.7 during the reaction process;

[0089] b. When the ORP reaches -650mv, stop adding Fe 2+ mud, and then continue to stir at a speed of 70rpm / min for 5min;

[0090] c. Continue to add Fe-containing iron and steel acid wastewater 2+ For acidic raw wastewater, stir at a speed of 70rpm / min for 50S, carry out neutralization reaction, and adjust the pH to about 7; if ORP2+ The consumption rate is about 200g / L.h, and stop aeration when the ORP reaches -680mv±10mv;

[0091] Step (3): Add 5 / million polymer flocculants of the total weight to the acid wastewater of iron ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G49/08C02F103/16
Inventor 金大一刘志东
Owner WUXI XINDU ENVIRONMENTAL PROTECTION EQUIP
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