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Multistage gradient adsorption channel adsorption technology

An adsorption tank and gradient technology, which is used in adsorption water/sewage treatment, solid adsorbent liquid separation, energy and wastewater treatment, etc. problems, to achieve the effect of convenient maintenance and update, good water output and wide adaptability

Inactive Publication Date: 2007-07-18
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of alkali precipitation method is the most common process. The traditional process has the following disadvantages: sludge dewatering equipment is required; large area is occupied and the operation is complicated
[0009] 2. At present, in the research of heavy metal wastewater treatment, the main research content focuses on the screening of cheap adsorbents, but there are few studies on the adsorption process matching with cheap adsorbents
The incompatibility between the existing adsorption process and the large-scale application of cheap adsorbents is also an important reason restricting the development of cheap adsorbents

Method used

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  • Multistage gradient adsorption channel adsorption technology
  • Multistage gradient adsorption channel adsorption technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Adsorption material pretreatment

[0033] The adsorbent is: peat. Dry the adsorbent in the sun, then crush the particles to 50 meshes, and then moisten it with water when using, and wait for it to be used after completely absorbing water.

[0034] 2. Pre-treatment of industrial wastewater

[0035] Preparation of simulated wastewater: Dissolve CaCl2 solid in 1000mL of distilled water, add distilled water to constant volume, and make Cd concentration of 56.0mg L -1 The heavy metal solution, at this time the pH is 6. The preparation of the simulated wastewater used in the comparative example is the same.

[0036] 3. Column adsorption

[0037] The adsorption column is: a self-flowing multi-stage gradient adsorption column in series (see Figure 2). This embodiment adopts a series asymmetric U-shaped adsorption column. The adsorption column is 3 cm high and arranged from top to bottom. The two adjacent column outlets and inlets Connected, and the height difference betwe...

Embodiment 2

[0042] Embodiment 2: process the industrial waste water containing heavy metal

[0043] 1. Adsorption material pretreatment

[0044] The adsorbent is: the natural adsorbent after embedding modification is: chitin. Dry the adsorbent in the sun, then crush the particles to 100 meshes, then moisten it with water when using it, and wait for it to be used after completely absorbing water.

[0045] 2. Pre-treatment of industrial wastewater

[0046] Industrial wastewater containing high concentration of heavy metals--acid wastewater, in which the highest content of heavy metals is Cd and Zn, most of which are free Cd and Zn. Use 10% and 0.5% NaOH, a total of 100mL to adjust to PH = 9.0. Then the adjusted sewage is used to remove the suspended matter with larger particles in the wastewater by sedimentation.

[0047] pH of industrial waste water

water type

heavy metal

shape

Cd (mg / L)

Pb(mg / L)

Cu(mg / L)

Zn(mg / L)

Acid wa...

Embodiment 3

[0056] 1. Adsorption material pretreatment:

[0057] The adsorbent is: the natural adsorbent after sulfonation modification is: diatomaceous earth. Dry the adsorbent in the sun, then crush it into 200-mesh granules, then soak it in water when it is used, and wait for it to be used after completely absorbing water.

[0058] 2. Pretreatment of sewage to be treated

[0059] The preparation of the simulated wastewater was the same as in Example 1, and the pH was adjusted to 4.0 with 5% and 1.0% HCl.

[0060] 3. Column adsorption

[0061] The adsorption column is: a network type self-flowing multi-stage gradient adsorption column. The parallel adsorption columns arranged in parallel are connected by pipelines to form a one-to-three connection mode, that is, a network. The water level of the water inlet of a single adsorption unit is higher than that of the outlet. The water level difference of the water outlet is 1cm. The water sample treated by the adsorption column of the uppe...

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Abstract

This invention relates to adsorbing technology that uses adsorptive process for processing various kinds of waste water. Concretely it is many-stage grade adsorption tank adsorbing technology. Use many-stage dissymmetry U type pillar as adsorbing substance packing pillar, use adsorbing substance as packing material. After achieving adsorptive capacity, reclaim heavy metals and regenerative adsorbing substance. This invention uses cheap adsorbing substance as packing material. Procedure is simple. Operation is stable and reliable. It is suitable for different heavy metal waste water disposal. Compared with existing vertical adsorbing column technology, its motive power is low. Cost is low. Passed waste water is more. Effect is good. Economic performance is good.

Description

technical field [0001] The invention relates to the treatment of heavy metal wastewater, in particular to a multi-stage gradient adsorption tank adsorption process based on natural and cheap adsorbents. Background technique [0002] Heavy metal wastewater mainly comes from mining smelting industry, mechanical processing industry wastewater and other industrial industries containing heavy metal wastewater. Heavy metal pollution exists in the wastewater of many factories, such as mining factories, smelting factories, metal equipment processing factories, electroplating factories, tanneries, etc. The soil around some military bases is also polluted, and even the leachate from certain landfills The concentration of heavy metal ions exceeds the standard. With the rapid development of the economy, a large amount of wastewater containing heavy metals is discharged, and these metals such as cadmium, lead, copper, zinc, chromium (trivalent and hexavalent), nickel, mercury, arsenic, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01D15/10
CPCY02W10/37
Inventor 张凯松周启星
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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