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Method for treating acidic wastewater containing iron

A treatment method and technology for wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Deal with land occupation and other issues to achieve the effect of eliminating secondary pollution

Active Publication Date: 2013-05-08
ZHEJIANG STATE INSPECTION & TESTING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The biggest disadvantage of the above two methods is that a large amount of iron hydroxide sludge is produced, which is difficult to reprocess, occupies land for landfill treatment, and causes secondary solid waste pollution and waste of resources.

Method used

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  • Method for treating acidic wastewater containing iron
  • Method for treating acidic wastewater containing iron
  • Method for treating acidic wastewater containing iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Acidic iron-containing wastewater 1 (PH value 1.1-1.8, Fe 2+ content of 2 ~ 6g / L) into the waste water storage tank A, then into the acidity adjustment tank B, slowly add lime milk 2 under mechanical stirring, adjust the pH value of the acidic iron-containing waste water 1 to about 4.5, filter through the filter C, The clear liquid enters the sealed reaction tank D, and a very small amount of filter residue is processed according to the traditional method. Add catalyst and additive 3 to reaction tank D (catalyst and additive come from catalyst and additive storage tank E), catalyst is sodium nitrite, additive is tartaric acid and sodium dodecylbenzenesulfonate, control sodium nitrite in the reaction tank The concentration of the additive is 0.0005mol / L, and the addition amount of the additive is 0.3% of the mass of the ferrous salt in the clear liquid in the reaction tank. After standing for 0.5 hours, the 3 Oxygen is continuously fed into the reaction tank from the bo...

Embodiment 2

[0046] Acidic iron-containing wastewater (PH value 1.1-1.8, Fe 2+ content of 2-6g / L) into the wastewater storage tank A, and then into the acidity adjustment tank B, slowly add calcium carbide slurry under mechanical stirring, adjust the pH value of the acidic iron-containing wastewater to about 4.0, filter through the filter C, clear The liquid enters the sealed reaction tank D, and a very small amount of filter residue is processed according to the traditional method. Add catalyzer and additive in reaction tank D, catalyzer is sodium nitrite, additive is tartaric acid and sodium dodecylbenzenesulfonate, controls the concentration of sodium nitrite in reaction tank at 0.0015mol / L, and the add-on of additive is 0.5% of the mass of ferrous salt in the clear liquid in the reaction tank, after standing for 1 hour, with 0.2m 3 Oxygen is continuously fed into the reaction tank from the bottom of the reaction tank at a speed of / h, and the oxygen is dispersed into the clear liquid ...

Embodiment 3

[0048] Acidic iron-containing wastewater (PH value 1.1-1.8, Fe 2+ content of 2 ~ 6g / L) into the waste water storage tank A, then into the acidity adjustment tank B, slowly add calcium carbide slurry under mechanical stirring, adjust the pH value of the acidic iron-containing wastewater to about 4.2, filter through the filter C, clear The liquid enters the sealed reaction tank D, and a very small amount of filter residue is processed according to the traditional method. Add catalyzer and additive in reaction tank D, catalyzer is potassium nitrite, additive is tartaric acid and sodium dodecylbenzenesulfonate, controls the concentration of sodium nitrite in reaction tank at 0.001mol / L, and the add-on of additive is 0.4% of the mass of ferrous salt in the clear liquid in the reaction tank, after standing for 0.8 hours, with 0.15m 3 Oxygen is continuously introduced into the reaction tank from the bottom of the reaction tank at a speed of / h, and the oxygen is dispersed into the c...

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Abstract

The invention provides a method for treating acidic wastewater containing iron, wherein the acidic wastewater containing the iron is produced in the rinsing process after rust removal during production and processing of fastening pieces. The method comprises the main steps of (1) regulating the pH value of the acidic wastewater containing the iron to be 4.0-4.5; (2) adding nitrite catalysts and annexing agents into a reaction tank, controlling the concentration of the nitrite catalysts in the reaction tank to be 0.0005 mol / L-0.0015 mol / L, continuously inflating oxygen into the reaction tank after standing, stopping inflating the oxygen after 7-10 hours' stirring reaction, controlling the pH value of reaction liquid in the reaction process to be 3.0-4.5, and keeping gas circulation in the reaction tank; and (3) standing, and then drying sediment to obtain iron yellow pigment. The treatment effect of the method is that the pH value of discharged water is 6-8, iron concentration is lowerthan 2mg / L, and the total nitrogen is lower than 20mg / L, thereby meeting state emission standards. After the by-product iron yellow pigment is sold, profits can be earned when treatment cost of the acidic wastewater containing iron is removed.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a treatment method for acidic iron-containing waste water produced in the rinsing process after derusting in the production and processing of fasteners. Background technique [0002] During the production and processing of fasteners, it is necessary to pickle and derust the raw materials and the products to be coated. A large amount of acidic iron-containing wastewater (hereinafter referred to as "acidic iron-containing wastewater") is generated in the rinsing process after derusting, about every 1 ton of production Fasteners produce 2.5 tons of acidic iron-containing wastewater, with a pH value of 1.1 to 1.8, Fe 2+ The content of 2~6g / L. [0003] The treatment method of the acidic iron-containing wastewater recorded in the prior art has: [0004] 1. The traditional treatment method of acidic iron-containing wastewater is to use lime milk and calcium carbide slurr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 张青春谢灵扬孙国峰罗明愉陈琦峰吴彩芬
Owner ZHEJIANG STATE INSPECTION & TESTING TECH CO LTD