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Bioleaching-Fenton-like oxidation combined bottom mud heavy metal removal and dehydration method

A biological leaching and heavy metal technology, applied in the field of environmental engineering, can solve the problems of long cycle and limited practical application, and achieve the effect of improving dehydration efficiency, saving treatment cycle and energy consumption, and high removal rate

Inactive Publication Date: 2015-08-05
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with chemical extraction technology, bioleaching has a longer cycle, which directly limits its practical application.
[0004] Recently, people have been studying the combination of some other methods with the bioleaching method in order to reduce the reaction cycle and improve the practical application feasibility of the method, but there are no relevant reports so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Aspergillus niger (commercially available) was cultivated on a solid slant medium in a plate, cultivated at 30° C. for 7 days, grown mature spores, and the surface of the colony was dark brown.

[0023] 2. Elute the spores on the plate with sterile deionized water to make a concentration of 1×10 7 Individual / mL spore suspension; then the spore suspension was inoculated into the liquid fermentation medium at an inoculum size of 1% (V / V), and 20% ( w / v) of the river channel sediment was leached at 25°C and 150 rpm for 5 days with constant temperature oscillation, and the pH was reduced to 3.5.

[0024] 3. After shaking and leaching, add hydrogen peroxide into the system until the final concentration of hydrogen peroxide in the system is 1g / L, oxidize for 45 minutes, and then carry out solid-liquid separation. The obtained solid can be used for composting or direct land use, and then make the river sediment Heavy metals can be leached out and dehydrated.

[0025] Soli...

Embodiment 2

[0028] 1. Sediment collection and property analysis

[0029] The bottom mud of the river channel was collected from a sewage channel in Liaoning Province. The bottom mud layer of 0-20cm below the silted river channel was collected by a tubular mud core sampler for many years. The collected bottom mud samples were removed from stones and animal and plant residues, freeze-dried, ground and passed 100-mesh nylon sieve, bagged for later use. Cd, Cu and Zn using HNO 3 -HClO 4 -HF digestion, atomic absorption graphite furnace method determination. Potassium dichromate volumetric method was used for the determination of organic matter content; ammonium molybdate spectrophotometric method was used for the determination of total phosphorus; acidity meter should be used for the determination of pH value. The physical and chemical properties of the sediment are listed in Table 1.

[0030] Table 1. Content and properties of heavy metals in sediment

[0031] project

[0032...

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Abstract

The invention belongs to the technical field of environment engineering and particularly relates to a bioleaching-Fenton-like oxidation combined bottom mud heavy metal removal and dehydration method. heavy metal in bottom mud is complexed and leached by enabling naturalized Aspergillus niger to use organic weak acids of organic waste production creatures, and accordingly, the reaction system pH is reduced to 2 to 4, and Fenton-like oxidation is used for improving the bottom mud dehydration efficiency and further leach heavy metal. The method is simple to operate, economic and practical and safe and reliable; a new way is provided for heavy metal pollution bottom mud disposition and reclamation.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for removing heavy metals in sediment and dehydrating by combining biological leaching and Fenton-like oxidation. Background technique [0002] At present, dredging technology is widely used in the treatment of polluted sediment at home and abroad. The sediment produced by dredging contains high concentrations of heavy metals and other toxic pollutants, so it is often piled up in the mud storage yard as solid waste. This method not only occupies a large amount of land, but also causes secondary pollution to the environment. The scouring and leaching of the heap can lead to soil and groundwater pollution; meanwhile, the moisture content of the dredged sediment is usually as high as 80-90%. These properties directly limit the subsequent safe disposal and resource utilization of dredged sediment, such as landfill, compost, land use, etc. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/06C02F11/14C02F101/20
Inventor 曾祥峰于晓曼魏树和孙丽娜
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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