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Treatment method of spray washing water in activated carbon production process

A technology for the production and treatment of activated carbon, which is used in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Treatment and other problems, to achieve the effect of being beneficial to biochemical treatment, high oxidative degradation efficiency, and small impact on water quality chromaticity

Inactive Publication Date: 2019-01-15
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method recycles the production wastewater after treatment and improves the treatment efficiency. However, it uses lime milk precipitation to remove phosphorus, which generates a large amount of solid waste, and cannot be recycled and processed for reuse. Poor, affecting subsequent wastewater treatment

Method used

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  • Treatment method of spray washing water in activated carbon production process
  • Treatment method of spray washing water in activated carbon production process
  • Treatment method of spray washing water in activated carbon production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 comprises the following steps:

[0044] ①Chemical precipitation: Take a certain amount of wastewater in a water bath to control the temperature at 30°C, add a fixed amount of magnesium chloride, and the dosage is based on n (Mg 2+ ):n(N):n(P)=1.5:1:1 molar ratio, slowly add liquid alkali to the wastewater during stirring at constant temperature to adjust the pH to about 9~10, and continue to stir and react for 20min under this condition, After the reaction, let it stand for 30 minutes, filter and separate, recover and purify the solid phase as a compound fertilizer for reuse, and carry out the next step in the liquid phase. After treatment, the effluent COD is 7000mg / L, ammonia nitrogen is 80mg / L, and total phosphorus is 50mg / L. The corresponding removal rates of the three are 6.7%, 91.1%, and 88.9%, respectively.

[0045] ②Magnetic flocculation and precipitation: For the tar, some macromolecular organic components and a small amount of residual total phos...

Embodiment 2

[0052] Compared with Example 1, step 1. in the dosage of magnesium chloride medicament according to n (Mg 2+ ):n(N):n(P) molar ratio is modified to 0.5:0.5:1.5, and the others are the same as in Example 1;

Embodiment 3

[0054] Compared with Example 1, step 1. in the dosage of magnesium chloride medicament according to n (Mg 2+ ):n(N):n(P) molar ratio was modified to 2:1.5:0.5, and the others were the same as in Example 1;

[0055] Example 2 and Example 3 see Table 2 for the effluent index after step 1. treatment:

[0056] Table 2 The effluent indicators of Examples 2~3 after step (1) treatment

[0057]

[0058] Insufficient addition of magnesium salt will lead to incomplete removal of ammonia nitrogen and total phosphorus in wastewater.

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Abstract

The invention discloses a treatment method of spray washing water in an activated carbon production process, and belongs to the technical field of wastewater treatment, and the method includes: 1, chemical precipitation, to be more specific, adding magnesium ions to form a precipitate, and performing solid-liquid separation to obtain a liquid phase entering the next step for treatment; 2, magneticflocculation and sedimentation, to be more specific, adding a flocculant and magnetic powder for flocculation and sedimentation, and performing magnetic separation to obtain a liquid phase entering the next step for treatment; and 3, persulfate oxidative degradation, to be more specific, adding a persulfate for reaction, wherein after the reaction is sufficient, macromolecular organic matters arebasically removed, and ammonia nitrogen and total phosphorus contents are low, and residual organic matters are small molecular components. The treatment method is used for treating the spray washingwater containing a large amount of tar and phosphoric acid and a relatively high concentration of the ammonia nitrogen in the activated carbon production process, can effectively remove the higher concentration of the ammonia nitrogen and total phosphorus in wastewater, and has high efficiency, simple process and reaction, mild and easy-to-control conditions and other characteristics.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for spraying washing water in the production process of activated carbon. Background technique [0002] The process of producing activated carbon by phosphoric acid activation is one of the most commonly used processes at present. The process includes soaking and activating the dried wood chips in phosphoric acid, then entering the carbonization furnace for calcination, and finally rinsing, separating, and drying to obtain activated carbon. Among them, the tar produced in the calcination process and a part of the phosphoric acid in the material are taken out by the spray washing water, and the water vapor needs to be absorbed by the alkaline ammonia solution in the scrubber to remove the tar and phosphoric acid. Wastewater contains a large amount of tar, phosphoric acid and high concentration of ammonia nitrogen. [0003] Nowadays, among the corre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12
CPCC02F1/488C02F1/5245C02F1/722C02F9/00
Inventor 郑搏英吴晓瑶江海云吴小亮胡章君
Owner ZHEJIANG QICAI ECO TECH CO LTD
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