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Method for recovering surfactant from soil washed liquid

A technology of surfactant and washing liquid, which is applied in the field of treating soil washing liquid and recovering surfactant, which can solve the problems of insufficient separation, troublesome liquid storage and disposal, etc., and achieve reduced treatment cost, good effect, and reduced sewage The effect of emissions

Active Publication Date: 2011-10-12
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the remaining waste liquid also contains polycyclic aromatic hydrocarbons and other substances, which cannot be fully separated, and the storage and disposal of the liquid will also bring unnecessary troubles

Method used

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  • Method for recovering surfactant from soil washed liquid
  • Method for recovering surfactant from soil washed liquid
  • Method for recovering surfactant from soil washed liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: the method for reclaiming surfactant from soil washing liquid

[0041] 1. Method (process such as figure 1 shown):

[0042] 1) After washing the soil with water containing surfactant TX100, precipitate, remove solid particles, recover the washed liquid, and obtain a soil washing liquid. Preliminary detection shows that the soil washing liquid contains 581.6 mg / L of surfactant and polycyclic aromatic hydrocarbons 0.507mg / L;

[0043] 2) The soil washing liquid is left to stand in the regulating tank until the water quality and quantity are stable, and the water surface is stable without ripples;

[0044] 3) Add cationic polyacrylamide (CPAM) accounting for 1% of the volume of the soil washing solution to the soil washing solution after standing, so that the flocculant and the soil washing solution are fully contacted and mixed to form a flocculent precipitate, and together with the sewage From flowing into the settling tank, leave standstill for 8 hours, ...

Embodiment 2

[0072] Embodiment 2: the method for reclaiming surfactant from soil washing liquid

[0073] 1, method, basically with embodiment 1, filtration rate is 18m / h.

[0074] 2, detection method is the same as embodiment 1;

[0075] 3. Results (see Table 3 and Table 4):

[0076] Table 3: Data before and after adsorption of polycyclic aromatic hydrocarbons (filtration rate is 18m / h)

[0077]

[0078] Table 4: Concentration values ​​before and after adsorption of TX100 (filtration rate is 18m / h)

[0079]

[0080] After testing, it was found that:

[0081] 1) Removal rate of polycyclic aromatic hydrocarbons: when the filtration speed is 18m / h, the removal rate of polycyclic aromatic hydrocarbons is 72.8% when filtered with less than 12 mesh activated carbon; the removal rate of polycyclic aromatic hydrocarbons is 84% ​​when filtered with 12-20 mesh activated carbon ;Filtered with activated carbon larger than 20 mesh, the removal rate of polycyclic aromatic hydrocarbons is 86%; ...

Embodiment 3

[0083] Embodiment 3: the method for reclaiming surfactant from soil washing liquid

[0084] 1, method, basically with embodiment 1, filtration rate is 24m / h.

[0085] 2, detection method is the same as embodiment 1;

[0086] 3. Results (see Table 5 and Table 6):

[0087] Table 5: Data before and after adsorption of polycyclic aromatic hydrocarbons (filtration rate is 24m / h)

[0088]

[0089] Table 6: Concentration values ​​before and after adsorption of TX100 (filtration rate is 24m / h)

[0090]

[0091] After testing, it was found that:

[0092] 1) Removal rate of polycyclic aromatic hydrocarbons: when the filtration speed is 24m / h, the removal rate of polycyclic aromatic hydrocarbons is 71.4% when filtered with less than 12 mesh activated carbon; the removal rate of polycyclic aromatic hydrocarbons is 79% when filtered with 12-20 mesh activated carbon ;Filtered with activated carbon larger than 20 mesh, the removal rate of polycyclic aromatic hydrocarbons is 82%;

...

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Abstract

The invention relates to a method for recovering a surfactant from soil washed liquid. The method comprises the steps of: 1) standing the soil washed liquid, wherein the soil washing liquid is the liquid waste recovered from the surfactant-containing cleaning liquid subjected to soil washing, 2) uniformly mixing the stood soil washed liquid with a flocculant to form sediments, standing, removing sludge after standing to obtain a solution A, 3) filtering the solution A with active carbon, wherein the obtained filtrate is a solution containing the surfactant. The method has the advantages of small occupied area, simplicity for operation, short system operation time, goodeffect of separating surfactant and polyaromatic hydrocarbon, and high recovering efficiency, and the recovered cleaning liquid can be reused for soil washing.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a method for treating soil washing liquid and recovering a surfactant. Background technique [0002] In the process of large-scale urbanization, tens of thousands of sites left behind by the relocation of enterprises in the chemical, metallurgical, and steel industries have appeared. On the other hand, the soil area directly polluted by oil fields in my country is about 4.8 million hm 2 , the oil content exceeds 1000 times the environmental background value. The soil in the above-mentioned places generally contains high levels of polycyclic aromatic hydrocarbons. Due to the extremely poor water solubility of polycyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons in the soil matrix have become a long-term pollution source of groundwater. These serious soil and groundwater contaminations pose great risks to the environment and public health, so before reusing these site...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01F17/42C09K23/42
Inventor 陈家军刘剑飞史震天王浩
Owner BEIJING NORMAL UNIVERSITY
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