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Effect of dissolved organic Effect of dissolved organic matter(DOM) derived from sewage matter(DOM) derived from sewage sludge on cadmium (Cd) adsorption sludge on cadmium (Cd) adsorption

in different soils in different soils

Zho u Jing

Yang Zho u U n ive rs ity

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Main content

1.What is DOM?2.Material and Method3.Result and Discuss (1)the different effect of DOM on

cadmium (Cd) adsorption in different soils. (2)the different effect of DOM in the

different levels of soils.

4.Conclusion

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1.What is DOM?

• Dissolved organic matter mainly refers to that some organic matter can dissolve in water and acid or alkali solution.

• DOM is one of the active components in the surface environment , It has very big effect on the soil of heavy metals in environmental behavior.

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2.Material and Method

• Material : sewage sludge (collected from Tang Wang wastewater treatment plant) .acidic soil and alkaline soil

• Method : 1.put 3 kinds of things in the conical flask. (1)1 gram sample of soil (2)10 milliliter DOM (3)different concentration of chromium

nitrate [Cd(NO3)2].

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2.Material and Method

2.Shake the conical flask 6 hours.

3.Put the mixed liquor in the centrifugal.

4.measure the content of cadmium (Cd) in the filteredfluid.

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3.Result and Discuss

(1)the different effect of DOM on cadmium (Cd) adsorption in different soils.

1 Look at the curve ， if the soil

had been mixed DOM,it would change the adsorption characteristics of cadmium (Cd).

2From the two pictures,we can see that there are two effects:acceleration and restrain .The two effects are connected with pH of the soil.

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3.Result and Discuss

(2)the different effect of DOM in the different levels of soils.The effects of DOM on cadmium (Cd) adsorption have large differents

between the different levels of soils .In the yellow soil of mountainous region,Look at the two pictures,The effects of DOM on cadmium (Cd) adsorption in the level B is more than level A.

pH of level A is same as level B,but TOC(Total Organic Carbon) of level A is larger than level B.therefore,The effect is connected with TOC of the soil.

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4.Conclusion

• More experiments have not been done,so conclusion is blank.

• TO BE CONTINUE...

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THANK YOU!

谢 谢