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Method for treating selenium-containing sewage

A treatment method and technology for sewage are applied in the field of treatment of selenium-containing sewage, which can solve the problems of insignificant treatment effect and unsuitable for industrial production.

Inactive Publication Date: 2013-07-03
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment effect on a small amount of selenium exceeding a trace amount of selenium and a large amount of selenium is not obvious, and it is not suitable for industrialized production

Method used

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  • Method for treating selenium-containing sewage
  • Method for treating selenium-containing sewage
  • Method for treating selenium-containing sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using C100 resin and S108 resin in series to treat sewage with high content of selenium

[0033] Sodium hydroxide is used to adjust the pH of raw sewage 3 (selenium concentration is 788.155ppm) to 7, then it is passed through the first adsorption column 1 equipped with C100 resin and the second adsorption column equipped with S108 resin, the first adsorption column It is connected in series with the second adsorption column, and each adsorption column is equipped with about 4L of resin. The flow rate of the raw sewage 3 in the resin is 1.3L / h, and the sample is taken after running for 1 hour. Among them, the sampling time interval is: CS072508, CS072516, CS072609, CS072610 are all at intervals of 1h, and others are at intervals of 0.5h. The selenium content of the treated sewage samples was determined by ICP test, and the samples were injected twice. The results of the selenium content determination are shown in Table 1. According to Table 1, the concentration of selen...

Embodiment 2

[0037] The recovery of embodiment 2 selenium

[0038] The raw sewage with a selenium concentration of about 788.155ppm was treated according to the method of Example 1, and then the C100 resin and the S108 resin were analyzed.

[0039] A. Analysis of C100 resin

[0040] Soak the resin with 10% industrial hydrochloric acid, wherein the volume of the resin is about 4L, the flow rate of 10% industrial hydrochloric acid is 500-550mL / h, sample the effluent after 8h, and then sample once every 0.5h, wherein, the sampling time interval is : JC072907, JC072908 and JC072909 all have an interval of 1h, and others have an interval of 0.5h. The concentration of selenium in the effluent was measured by atomic absorption spectrometer. The measurement results are shown in Table 2. Drawn from the data in Table 2 figure 2 .

[0041] From figure 2 It can be seen from the figure that the analytical value of C100 resin presents a normal distribution, most of the effluent concentrations ar...

Embodiment 3

[0054] Embodiment 3 adopts C100 resin and S108 resin series treatment to contain a small amount of selenium sewage

[0055] The pH of raw sewage 3 (selenium concentration is 2.3ppm) is adjusted to 7 with sodium hydroxide, then it is passed through the first adsorption column 1 that C100 resin is housed and the second adsorption column that S108 resin is housed, the first adsorption column It is connected in series with the second adsorption column, and each adsorption column is equipped with about 4L of resin. The flow rate of the raw sewage 3 in the resin is 0.65L / h, and the sample is taken after running for 1 hour. Among them, CS081201 to CS081615 are sampled every 0.5h, CS081617 to CS081727 are sampled every 1h, and others are sampled every 1.5h. Test samples: if the last two digits of the number are continuous, the samples are measured; otherwise, every other The sample is tested once, and the sewage discharged up to the standard takes 48.5 hours. The selenium content was...

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Abstract

The invention provides a method for treating selenium-containing sewage, which comprises the following steps: regulating the pH value of the selenium-containing sewage to 7-8 to serve as the raw sewage, wherein selenium in the raw sewage exists in the form of seleninic acid ion or selenate radical icon; supplying the raw sewage to a first adsorption column, wherein the first adsorption column contains C100 resin, performs a first adsorption treatment on the raw sewage and discharges the first treated sewage; supplying the first treated sewage discharged from the first adsorption column to a second adsorption column, wherein the second adsorption column contains C108 resin or A420 resin, performs a second adsorption treatment on the first treated sewage and discharges the second treated sewage. The method for treating selenium-containing sewage can effectively treat selenium-containing sewage, including micro-content selenium sewage, low-content selenium sewage and high-content selenium sewage, and can remove quadrivalent selenium or hexavalent selenium in the sewage, so as to separate two valency states of selenium.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a treatment method for selenium-containing sewage. Background technique [0002] Selenium is a non-metallic element. Selenium in water exists in the form of inorganic hexavalent, tetravalent, negative divalent and some organic selenium. There may also be a very small amount of element selenium attached to solid particles. Generally, natural water mainly contains hexavalent or tetravalent selenium, most of which are below 1 μg / L. Selenium-containing sewage mainly comes from industries such as oil refining, refining oil, manufacturing sulfuric acid and special glass. The selenium in the sewage can increase the chemical oxygen demand (Chemical Oxygen Demand, abbreviated as COD) of the sewage, pollute the environment, and selenium is an essential trace element for the human body, and its price is expensive, so it is very important to recycle and utilize the selenium in the sewage. High ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/28
Inventor 朱刘苟丽宁
Owner FIRST RARE MATERIALS CO LTD
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