CN103639194A - Method for repairing mercury polluted soil by sodium bentonite - Google Patents

Abstract

The invention discloses a method for repairing mercury polluted soil by sodium bentonite. The method comprises the following steps: mixing the sodium bentonite with a foaming agent to prepare gel/foamed slurry; sufficiently mixing the gel/foamed slurry with soil on the surface of the mercury polluted soil; and treating and culturing for a period of time, thereby fixing more than or equal to 65% of mercury in the soil. With the adoption of the technical scheme disclosed by the invention, the method is simple and feasible, is high in treatment efficiency and low in management cost, and has very important practical significances on researching measures of preventing industrial polluted mercury from running off to be naturally circulated.

Description

A kind of method of utilizing sodium bentonite to repair mercury contaminated soil

Technical field

The present invention relates to soil remediation technical field, relate to particularly a kind of method of utilizing sodium bentonite to repair mercury contaminated soil.

Background technology

Heavy metal is because it cannot be eliminated, and inextirpable reason, has caused many irreversible pollution condition to environment.Once enter in a large number in soil and underground water, will cause the environmental hazard that is difficult to reparation.

Conventional method is all to utilize the construction materials such as cement, lime fill and stablize, but because its stablizing effect is general, dissolution rate is higher, and has certain pollution, does not also receive extensive use.In recent years, find the important research direction that effective heavy metal stabilizer becomes environment remediation industry.

Summary of the invention

The object of this invention is to provide a kind of method of utilizing sodium bentonite to repair mercury contaminated soil.

For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:

Utilize sodium bentonite to repair a method for mercury contaminated soil, comprise the following steps:

Step 1), by bentonite, is sieved with 100 mesh sieves;

Step 2), by step 1 gained bentonite, mixed foaming agent is made gel/foaming mud;

Step 3) is turned over the mercury contaminated soil plough of mercury contaminated soil ground surface 0-20 centimetre, air-dry, grind, sieve, standby;

The gel that step 4) is made step 2 mixed foaming, is spread on the soil that step 3 was processed, and bentonite consumption is that per kilogram soil is used the gel of calcic 10-15 mM, fully mixes with soil;

Step 5) maintains 60% of Tu earth Han Shui Liang≤field moisture, through three months, completes once and repairs.

The invention has the beneficial effects as follows:

Adopt technical solution of the present invention, simplicity of design, easy to operate; Without complicated treatment facility, cost is low; Process thoroughly non-secondary pollution.

The specific embodiment

Below in conjunction with embodiment, describe the present invention in detail.

Utilize sodium bentonite to repair a method for mercury contaminated soil, comprise the following steps:

Step 1), by bentonite, is sieved with 100 mesh sieves;

Step 2), by step 1 gained bentonite, mixed foaming agent is made gel/foaming mud;

Step 3) is turned over the mercury contaminated soil plough of mercury contaminated soil ground surface 0-20 centimetre, air-dry, grind, sieve, standby;

The gel that step 4) is made step 2 mixed foaming, is spread on the soil that step 3 was processed, and bentonite consumption is that per kilogram soil is used the gel of calcic 10-15 mM, fully mixes with soil;

Step 5) maintains 60% of Tu earth Han Shui Liang≤field moisture, through three months, completes once and repairs.

Claims (1)

1. utilize sodium bentonite to repair a method for mercury contaminated soil, it is characterized in that, comprise the following steps:

Step 1), by bentonite, is sieved with 100 mesh sieves;

Step 2), by step 1 gained bentonite, mixed foaming agent is made gel/foaming mud;

Step 3) is turned over the mercury contaminated soil plough of mercury contaminated soil ground surface 0-20 centimetre, air-dry, grind, sieve, standby;

The gel that step 4) is made step 2 mixed foaming, is spread on the soil that step 3 was processed, and bentonite consumption is that per kilogram soil is used the gel of calcic 10-15 mM, fully mixes with soil;

Step 5) maintains 60% of Tu earth Han Shui Liang≤field moisture, through three months, completes once and repairs.