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A control method for the enhanced pretreatment of vanadium precipitation wastewater by resin adsorption separation

A technology for resin adsorption and vanadium precipitation wastewater, which is applied in water treatment parameter control, adsorption water/sewage treatment, water/sewage treatment, etc. It can solve the problems of inability to carry out precise control and difficulty in effectively separating vanadium and chromium elements, so as to improve resin Separation efficiency, avoiding the reduction of processing efficiency, and the effect of high-efficiency separation

Active Publication Date: 2022-04-22
JIANGSU NJU ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the defect that the vanadium-chromium element in the prior art is difficult to effectively separate and cannot be accurately controlled, the patent of the present invention provides a pretreatment method that can realize the separation of vanadium-chromium element, and can precisely control the material input during the pretreatment process. increase

Method used

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  • A control method for the enhanced pretreatment of vanadium precipitation wastewater by resin adsorption separation
  • A control method for the enhanced pretreatment of vanadium precipitation wastewater by resin adsorption separation
  • A control method for the enhanced pretreatment of vanadium precipitation wastewater by resin adsorption separation

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Embodiment 1

[0044] The operation steps of the vanadium precipitation wastewater that the present embodiment is aimed at are as follows:

[0045] (1) Take 1L of vanadium precipitation wastewater, the initial pH of the wastewater is 1.78, and the initial oxidation-reduction potential ORP 1 is 684.2mv;

[0046] (2) Carry out reduction treatment, add reducing agent sodium thiosulfate in the raw water, the reduction potential ORP after the reduction reaction is complete 2 Set to 600mv, the dosage M1 of the reducing agent can be calculated from the reducing agent calculation formula, namely:

[0047] M1=A*ln(ORP 1 -ORP 2 )-B Formula 1;

[0048] A=3±0.3; B=5.5±0.5;

[0049] In this example, A is 2.7, and B is 6. From this, it can be calculated that the dosage of the reducing agent is 6.0 g / L, and the reaction time after adding the reducing agent is 60 minutes;

[0050] (3) Adjust the base of the water sample after reduction, adjust the pH to 3 with sodium hydroxide, and stabilize the oxida...

Embodiment 2

[0059] The operation steps of the vanadium precipitation wastewater that the present embodiment is aimed at are as follows:

[0060] (1) Take 1L of vanadium precipitation wastewater, the initial pH of the wastewater is 1.78, and the initial oxidation-reduction potential ORP 1 is 684.2mv;

[0061] (2) Carry out reduction treatment, add the reducing agent sodium thiosulfate to the raw water, and the target oxidation-reduction potential ORP after the reduction reaction is complete 2 The value is 620mv, and the dosage M1 of reducing agent can be calculated from the formula of reducing agent, namely:

[0062] M1=A*ln(ORP 1 -ORP 2 )-B Formula 1;

[0063] A=3±0.3; B=5.5±0.5;

[0064] In this embodiment, A takes 3.3, and B takes 5. From this, it can be calculated that the dosage of the reducing agent is 8.7g / L. Adding the reducing agent sodium thiosulfate can be added in stages, and the first stage is 5g, and the reaction The time is 30 minutes; the second level is added with 3....

Embodiment 3

[0074] The operation steps of the vanadium precipitation wastewater that the present embodiment is aimed at are as follows:

[0075] (1) Take 1L of vanadium precipitation wastewater, the initial pH of the wastewater is 1.81, and the initial oxidation-reduction potential ORP 1 is 691.2mv;

[0076] (2) Carry out reduction treatment, add the reducing agent sodium metabisulfite to the raw water, and the target oxidation-reduction potential ORP after the reduction reaction is complete 2 The value is 550mv, and the dosage M1 of the reducing agent can be calculated from the reducing agent calculation formula, namely:

[0077] M1=A*ln(ORP 1 -ORP 2 )-B Formula 1;

[0078] A=3±0.3; B=5.5±0.5;

[0079] In this example, A is taken as 3, and B is taken as 5.5. From this, it can be calculated that the dosage of the reducing agent is 9.35g / L. Adding the reducing agent sodium thiosulfate can be added in stages, and the first stage is 6g. The reaction time is 30min; the second stage is 3...

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Abstract

The invention discloses a method for controlling vanadium precipitation waste water resin adsorption separation strengthening pretreatment, which belongs to the field of waste water treatment. The method comprises the following steps: 1) Adding a reducing agent, the amount of which is added according to M1=A*ln(ORP 1 -ORP 2 )‑B formula calculation, ORP 1 is the initial oxidation-reduction potential, ORP 2 2) adjust the pH of the wastewater to 3-4 with lye, and measure the oxidation-reduction potential ORP 3 ; 3) Add oxidant, set the target value ORP of oxidation-reduction potential 4 , ORP 4 Set between 450 ~ 550mv, the oxidant according to M2 = C * (ORP 4 -ORP 3 )-D calculation; 4) Resin adsorption. The pretreatment of the present invention can greatly improve the subsequent resin separation efficiency, and at the same time establish the relationship between the oxidation-reduction potential and the material, so as to achieve more precise control.

Description

technical field [0001] The invention belongs to the field of waste water resource utilization, and relates to a control method for resin adsorption, separation and enhanced pretreatment of vanadium precipitation waste water. Background technique [0002] Vanadium precipitation wastewater is a kind of strongly acidic, high-salt wastewater. The pH of the wastewater is about 2. The salinity is mainly sodium sulfate and ammonium sulfate, of which the ammonium sulfate content is about 2.8%, and the sodium sulfate content is about 14%. Organic matter in the wastewater The content is less, less than 100mg / L, and the heavy metal elements are mainly vanadium chromium, of which the content of vanadium is between 660-680mg / L, and the content of chromium is about 1900-2500mg / L, both of which are relatively high. [0003] For the treatment of vanadium-chromium wastewater, relevant applications have been disclosed in the prior art, such as Chinese patent application number CN201510004197....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F9/04C02F101/20C02F101/22
CPCC02F1/285C02F9/00C02F2209/06C02F2209/04C02F2101/22C02F2101/20C02F1/72C02F1/66
Inventor 高亚娟汪林邵燕唐凯朱兆坚张炜铭吕振华
Owner JIANGSU NJU ENVIRONMENTAL TECH
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