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Modified bentonite used for treating garbage percolate and its manufacturing method

A technology of landfill leachate and manufacturing method, which is applied in chemical instruments and methods, adsorbed water/sewage treatment, inorganic chemistry, etc., can solve the problems of high treatment cost, large investment and high cost, and achieves simple production process and improved removal rate. rate, good effect

Active Publication Date: 2007-07-04
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the above-mentioned method to treat landfill leachate generally requires a large amount of capital investment and the use of complex and large-scale equipment, so the treatment cost is very high, the investment is large, and the treatment process is also very complicated, and even after treatment, the landfill leachate The COD concentration is still around 1000mg / L, still unable to meet my country's comprehensive sewage discharge standards
At present, there is also research on the use of modified bentonite in the treatment of municipal landfill leachate, but the existing bentonite modification methods cannot directly use bentonite raw ore to modify, and the bentonite must be purified before the bentonite is modified. But because the purification process of bentonite is very complicated, a large amount of water is needed during operation, and solid-liquid separation is also very difficult, and complex and large-scale equipment is required to operate, so the existing method is used to modify bentonite. Very high, and the process is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) Bentonite is crushed to 20 meshes, and water is added to make a slurry; in the obtained bentonite slurry, the solid-to-liquid mass ratio of bentonite to water is 1:4;

[0014] 2) dissolving aluminum chloride in water and stirring evenly to obtain an aluminum chloride solution with a mass concentration of 5%;

[0015] 3) Add the aluminum chloride solution into the bentonite slurry, and stir while adding until the two are fully mixed, then adjust the pH value of the resulting mixed solution to 5, and then age it for 5 hours; the selected bentonite and aluminum ions The ratio of 1g: 15mmol;

[0016] 4) Put the above mixed solution at 80°C for 10 hours;

[0017] 5) Then the obtained mixed solution is dried at 100°C for 12 hours to obtain modified bentonite which can be used for treating landfill leachate.

Embodiment 2

[0019] 1) Pulverize bentonite to 100 mesh, and add water to make slurry; in the obtained bentonite slurry, the solid-to-liquid mass ratio of bentonite to water is 1:15;

[0020] 2) dissolving ferrous sulfate in water and stirring evenly to obtain a ferrous sulfate solution with a mass concentration of 60%;

[0021] 3) Add the ferrous sulfate solution into the bentonite slurry, and stir while adding until the two are fully mixed, then adjust the pH value of the resulting mixed solution to 9, and then age it for 1 hour; wherein the selected bentonite and iron The ratio of ions is 1g: 1mmol;

[0022] 4) Put the above mixed solution at 60°C for 8 hours;

[0023] 5) Then the obtained mixed solution was dried at 120° C. for 6 hours to obtain modified bentonite which can be used for treating landfill leachate.

Embodiment 3

[0025] 1) crushing bentonite to 200 mesh, and adding water to make slurry; in the obtained bentonite slurry, the solid-to-liquid mass ratio of bentonite to water is 1:9;

[0026] 2) dissolving polyaluminum chloride in water, stirring evenly to obtain a polyaluminum chloride solution with a mass concentration of 50%;

[0027] 3) Add the polyaluminum chloride solution into the bentonite slurry, and stir while adding until the two are fully mixed, then adjust the pH value of the resulting mixed solution to 7, and then age it for 3 hours; wherein the selected bentonite and The ratio of aluminum ion is 1g: 20mmol;

[0028] 4) Put the above mixed solution at 100°C for 24 hours;

[0029] 5) Then the obtained mixed solution was dried at 110° C. for 20 hours to obtain modified bentonite which can be used for treating landfill leachate.

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Abstract

A modified bentone used for treating the percolate of garbage is prepared through pulverizing raw bentone, mixing with water to become slurry, dissolving soluble salt in water while stirring, mixing it with said slurry, regulating pH=5-9, ageing, heating to 60-100 deg.C, reaction for 8-24 hr and drying.

Description

(1) Technical field: [0001] The invention relates to a mineral material, in particular to a modified bentonite which can be used to treat landfill leachate, and also relates to a manufacturing method of the modified bentonite. (two) background technology: [0002] Municipal landfill leachate is a secondary pollutant produced in the landfill process. It is a kind of organic wastewater with a high concentration and complex composition, which is gray-black in color and has a foul smell. The main sources of its generation are: (1) the infiltration of precipitation and snowfall, which is the main source of leachate production; (2) the inflow of external surface water, including surface runoff and surface irrigation; (3) when landfill seepage If the water level of the filtrate is lower than that of the groundwater outside the site and no anti-seepage system is installed, the groundwater may infiltrate into the landfill; (4) the moisture contained in the garbage itself; (5) the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40C02F1/28
Inventor 徐文炘张静肖筱瑜李蘅李毅
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD