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Treatment process of lignite upgrading wastewater

A treatment process and technology for sewage, applied in water/sewage multi-stage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc. Achieving the effect of avoiding secondary pollution problems, improving precipitation effect and reducing treatment costs

Inactive Publication Date: 2012-02-22
李柏荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of activated carbon is relatively high. If it is used to treat lignite wastewater in practice, the cost is too large to be realized.
[0014] From the above, it can be seen that since lignite-upgraded sewage is extremely difficult to treat phenol-containing sewage, if its treatment method refers to the coking wastewater treatment method, either the treatment cost is high, or the treatment effect is not good, and the treatment still cannot meet the discharge standard.

Method used

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  • Treatment process of lignite upgrading wastewater
  • Treatment process of lignite upgrading wastewater
  • Treatment process of lignite upgrading wastewater

Examples

Experimental program
Comparison scheme
Effect test

test approach 1

[0153] A. take by weighing anionic polyacrylamide (molecular weight 10,000,000) and be mixed with 0.1% solution, quicklime is made into 10% lime solution;

[0154] B. Take 3L Ximeng lignite upgrading sewage, stir and add lime solution, adjust the pH value to 9.5;

[0155] C. Stir and slowly add flocculant aqueous solution, the dosage is 10mg / L;

[0156] D. After stirring for 2 minutes, let it stand for 10 minutes, filter out the sewage with a sieve, and add 98% sulfuric acid to adjust the pH value to 6.5;

[0157] E. Take Ximeng upgraded lignite and add it to the first four water treatment pipes, and add activated carbon HS380 to the last four water treatment pipes. The filling height is 90% (the water treatment pipe is 1m high, the outer diameter of the pipe is 75mm, and the inner diameter 68mm);

[0158] F. Pass the sewage with adjusted pH value through four upgraded lignite water treatment pipes in turn, and then pass through four activated carbon water treatment pipes, a...

test approach 2

[0164] In this test plan, the upgraded lignite was used to adsorb the sewage several times until the color and smell of the effluent did not change significantly, and then activated carbon was used for final treatment to reduce the load of activated carbon as much as possible.

[0165] A. take by weighing anionic polyacrylamide (molecular weight 10,000,000) and be mixed with 0.1% solution, quicklime is made into 10% lime solution;

[0166] B. Take 3L of the sewage produced by upgrading the lignite produced in Ximeng, stir and add lime solution, and adjust the pH value to about 9;

[0167] C. Stir and slowly add flocculant aqueous solution, the dosage is 10mg / L;

[0168] D. After stirring for 2 minutes, let it stand for 10 minutes, filter the sewage with a sieve, and add 98% sulfuric acid to adjust the pH value to 6;

[0169] E. Take the upgraded lignite produced after upgrading the lignite produced in Ximeng, add it to the water treatment pipe, and the filling height is 90% (...

test approach 3

[0177] A. take anionic polyacrylamide (molecular weight 10 million) and be mixed with 0.1% solution, polyaluminum chloride is mixed with 1% solution, quicklime is mixed with 10% solution;

[0178] B. Take 1L lignite upgrading mixed sewage, add different compounds to stir and adjust its pH value;

[0179] C. Stir and slowly add the flocculant aqueous solution, stir for 2 minutes and then observe the test phenomenon.

[0180] Table 13 Records of test phenomena

[0181]

[0182] It can be seen from the test phenomenon in Table 13 that the mixed sewage will not agglomerate and precipitate under alkaline conditions. When the pH value is adjusted to 4, the sewage agglomerates and precipitates, and the effect of using polyaluminum chloride (PAC) and polyacrylamide (PAM) as a flocculant is better than using polyacrylamide alone. Wherein the amount of 98% sulfuric acid is 3.2g / L, the amount of PAC is 90mg / L, and the amount of PAM is 6mg / L.

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Abstract

The invention discloses a treatment process of lignite upgrading wastewater. The treatment process comprises the following steps: 1) adjusting the pH value of the wastewater to be treated to 3-11; 2) adding a flocculant to precipitate; 3) then adjusting the pH value to 4-8; 4) using the upgraded lignite as an adsorbent to adsorb; and 5) then using activated carbon as an adsorbent to adsorb. In the treatment process, the pH value is adjusted firstly and flocculation and precipitation are performed secondly to precipitate suspended pollutants, thus the precipitation effect can be increased; then the product of the lignite upgrading process, namely upgraded lignite is used as the adsorbent to adsorb, the porous structure of the upgraded lignite is used for replacing a lot of activated carbon to perform the adsorption of pollutants and adsorbing most of harmful substances; and finally a little activated carbon is used for performing final adsorption. Therefore, the dosage of the activated carbon can be greatly reduced, the cost can be reduced, the treatment process can realize low cost and high self-sustainability, and the real standard discharge of the lignite upgrading wastewater can be realized on the premise of successfully reducing the treatment cost of the lignite wastewater.

Description

technical field [0001] The invention relates to the technical field of recovery and treatment of lignite-treated waste materials, in particular to a treatment process for lignite-upgraded sewage with low cost and good treatment effect. Background technique [0002] Since the lignite upgrading and molding process is a new process both at home and abroad, the treatment or recycling method of the sewage discharged by this process is still blank so far. Lignite upgrading wastewater is extremely difficult to treat and contains phenolic wastewater. Direct discharge will cause serious water and soil pollution. Therefore, it has become a major problem in environmental protection for lignite upgrading, and it has also become a factor that makes lignite development difficult. [0003] The lignite upgrading process is similar to the coking process. According to the data, the water quality of the lignite upgrading wastewater is similar to that of the coking wastewater after ammonia dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/28C02F1/56
Inventor 李柏荣
Owner 李柏荣
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