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Sludge dewatering and decontaminating combined treatment method

A technology of joint treatment and sludge dewatering, applied in the field of contaminated soil treatment, can solve the problems of poor effect of low-permeability fine-grained contaminated soil, unguaranteed pollutant stability, occupying a large area of ​​land, etc. The effect of reducing the storage area and improving the drainage and bearing capacity

Inactive Publication Date: 2018-11-23
BEIJING ZHONGYAN DADI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the dehydration of sludge basically adopts the rapid dehydration methods of industrial production lines, such as mechanical extrusion, centrifugal dehydration, drying and other methods. Due to the low permeability of sludge, these methods are relatively expensive for large-scale sludge dewatering. high
There are at least two defects in the existing pollutant treatment technologies for various sludges: one, for the permeability coefficient lower than 10 - 4 cm / s low permeability fine particle polluted soil is very poor
Second, it is only effective for a specific pollutant. For example, technologies suitable for the treatment of organic pollutants are generally not suitable for the treatment of inorganic pollutants; Possibly ineffective; in addition, some treatment techniques, such as solidification and stabilization, do not remove pollutants, so there is no guarantee of long-term stockpiling stability after pollutant treatment
Moreover, during and after the treatment of such a large amount of solid pollutants, it usually takes a large area and takes a long time. These conditions are often difficult to meet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Sludge from an electroplating factory: particle size distribution is 50%-8 cm / s, moisture content 220%. Pollutant content: Cr 1464mg / kg, Cu 1088 mg / kg, Ni 1342mg / kg, Zn 344mg / kg; background value Cr 75mg / kg; Cu 31mg / kg; Ni 115mg / kg, Zn 221mg / kg.

[0068] The construction can be stacked with an area of ​​100m×50m. Each layer of sludge is 1.2m thick, and there are 40 layers in total. A conductive polymer tube is used as the electrode, with a diameter of 2 cm. The tube wall is mesh-shaped. The cathode and anode electrodes are covered with commercially available anion exchange membranes and cation exchange membranes respectively, and the outermost layer is covered with a layer of geotextile. The electrode length is 50m. Lead out a wire at an interval of 25m on the electrode. The electrode interval is 100cm; the voltage gradient between the positive and negative electrodes is 2.3V / cm.

[0069] Removal rate: Cr 60%, Cu 27%, Ni 66%, Zn 22%;

[0070] Construction method: ...

Embodiment 2

[0084] Sludge produced by river dredging polluted by sewage from chemical plants, moisture content 122%, pH=5.0, particle size 20μm14.04%; permeability coefficient 1.15 10 -7 cm / s. Pollutant content: Cd 4.65mg / kg (effective state 0.86 mg / kg), Pb 384.15 mg / kg (effective state 64.17 mg / kg), Cu 66.24 mg / kg (effective state 6.73 mg / kg), Zn 245.28 mg / kg kg (effective state 98.24 mg / kg).

[0085] The area of ​​the storage site for construction is 50×30m. Each layer of sludge is 1.0m thick, and there are 40 layers in total. A commercially available conductive polymer drainage board was used as an electrode, and a wire was drawn out on the electrode at an interval of 15m. The electrode interval of each layer of electrodes is 1.0m. The voltage gradient between positive and negative electrodes is 1.5V / cm, and the power supply mode is intermittent power supply, 15 minutes of power supply, 15 minutes of rest. Inject tap water into the anode and inject 0.3M citric acid into the cath...

Embodiment 3

[0097] The sludge discharged from the production process of a certain project is fine-grained mud mainly composed of clay mineral kaolinite, with a water content of 260% and a permeability coefficient of 1.1×10 -8 cm / s; Pb 2+ Content 2000mg / kg, Zn 2+ Content 1100mg / kg.

[0098] The construction can be stacked with an area of ​​200m×150m. Each layer of sludge is 1m thick, and there are 40 layers in total.

[0099] The electrode interval of each layer of electrodes is 1.0m. The cathode is a stainless steel tube, and the anode is a titanium alloy tube with a ruthenium oxide coating; the diameter of the electrode tube is 1.6 cm, and the tube wall is distributed along the cross section at 30° and every 2 cm along the long direction ϕ 2mm hole; the length of each electrode is 50m, and a wire is drawn out at an interval of 25m on the electrode. The voltage gradient between the positive and negative electrodes was 2.5 V / cm.

[0100] Removal rate: Zn 2+ =94%; while Pb 2+ 43%.

...

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Abstract

The invention discloses a sludge dewatering and decontaminating combined treatment method, and belongs to the field of contaminated soil management. The sludge dewatering and decontaminating combinedtreatment method comprises the following steps: stacking an electrode group formed by electrodes which are horizontally distributed and are capable of electrifying and introducing water with a sludgelayer; applying direct current to sludge through the electrodes, generating an electric field, injecting an appropriate amount of liquid through electrified water filling pipelines of the electrodes,thus regulating a chemical reaction environment in the sludge; meanwhile, under the action of the electric field, enabling pollutants in the sludge to migrate towards the electrodes and be brought outby the liquid through the water filling pipelines of the electrodes, thus realizing removing of the pollutants in the sludge; meanwhile, enabling water in the sludge to migrate towards the electrodesand be discharged through the water filling pipelines of the electrodes, and in addition, further extruding the water in the sludge to the electrodes and discharging the water through the water filling pipelines under the action of overlying gravity. According to the sludge dewatering and decontaminating combined treatment method disclosed by the invention, dewatering and decontaminating of a large amount of sludge can be implemented, various pollutants in the sludge can be removed at the same time, the treatment time is short, and the construction land occupation is less.

Description

technical field [0001] The invention relates to a sludge dehydration and decontamination combined treatment technology, which belongs to the field of polluted soil treatment. Background technique [0002] Cleaning up river courses and lake bottoms produces a large amount of silt. These sludges have a high water content and are usually fluid or plastic; the sludge is composed of fine particles and has very low permeability, usually with a permeability coefficient of less than 10 -4 cm / s. At the same time, there are high levels of pollutants in the sludge, and the types of pollutants include organic pollutants and inorganic pollutants; various pollutants are divided into different types, for example: heavy metal pollution among inorganic pollutants The heavy metal pollutants are different according to the different heavy metals contained. In addition, some industrial production processes also produce a large amount of sludge. Dehydration and removal of pollutants must be c...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12
CPCC02F11/006C02F11/12
Inventor 刘兴华王京刘金龙
Owner BEIJING ZHONGYAN DADI TECH CO LTD
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