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Preparation method of modified turf adsorbent

A technology of modified peat and adsorbent, which is applied in chemical instruments and methods, adsorption water/sewage treatment, energy wastewater treatment, etc. Problems such as large land area, to achieve the effect of process production and economic benefit improvement, mechanical strength and stability enhancement, and low requirements

Inactive Publication Date: 2007-08-01
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 disadvantages of the traditional process are: sludge dehydration equipment is required; large area is occupied and the operation is complicated
So far, there has been no report on an adsorbent based on alkali-treated modified peat.

Method used

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  • Preparation method of modified turf adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of modified peat adsorbent:

[0032] Pre-treatment of peat soil: The raw materials used are: natural peat. The natural peat is dried, sun-dried or air-dried, and the sundries are detected separately, and crushed into 40-mesh granules for later use.

[0033] Preparation method: Use 1mol / L NaOH to neutralize the peat (PS) sample to pH = 10.0, then use 0.1mol / L NaOH to adjust the liquid-solid ratio to 1:1, stir at room temperature for 24 hours, and centrifuge, the sediment is peat for the first time The remaining substance after extraction is the alkali-treated modified peat adsorbent (APS1). After drying the APS1, it is ground through a 60-mesh sieve for later use. It is tested with 60-mesh peat to treat heavy metal wastewater under constant stirring. The microstructure of PS and APS1 after adsorbing heavy metals was observed by scanning electron microscope.

[0034] Simulated initial concentration of heavy metal wastewater: Cd: 5.6mg / L, Pb: 41.4mg / L, Cu: 12...

Embodiment 2

[0051] The difference from Example 1 is:

[0052] Preparation of modified peat adsorbent:

[0053] Pre-treatment of peat soil: Peat is crushed into 60-mesh particles for later use.

[0054] Preparation method: Use 1mol / L KOH to neutralize the peat sample to pH = 11, then use 0.1mol / L NaOH to adjust the liquid-solid ratio to 10:1.

[0055] Preparation of another modified peat adsorbent: use 1mol / L KOH to neutralize the peat sample to pH = 11, then use 0.1mol / L NaOH to adjust the liquid-solid ratio to 10:1, static separation, and the separated supernatant , with 6mol / LH 2 SO 4 Adjust its pH value to make it pH=3.

Embodiment 3

[0057] The difference from Example 1 is:

[0058] Preparation of modified peat adsorbent:

[0059] Pre-treatment of peat soil: Peat is crushed into 80-mesh particles for later use.

[0060] Preparation method: Use 1mol / L soda lime to neutralize the peat sample to pH = 11, then use 0.1mol / L NaOH to adjust the liquid-solid ratio to 50:1.

[0061] Preparation of another modified peat adsorbent: use 1mol / L soda lime to neutralize the peat sample to pH = 11, then adjust the liquid-solid ratio to 50:1 with 0.1mol / L NaOH, separate statically, and separate the supernatant liquid, with 6mol / LHNO 3 Its pH was adjusted to make it pH=3.

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Abstract

The invention involves heavy metal wastewater treatment, specifically a preparation method based on a modified adsorbent of peat. It uses natural peat as the main raw material and alkaline solution to neutralize peat,regulates the pH of mixed solution to 10-12, then adjust the solid-liquid ratio to 1:1-1:100 with alkali solution, stirs, stews, separates the sediments from the supernatant, dries and disintegrates said sediments then prepares the modified peat adsorbent. The adsorption capacity of original peat is improve d, while the stability and the anti-hostile environment environmental capacity are strengthened. And the preparation method using the invention can prepare humic acid as absorbent which further enhance the industrial added value of peat. The raw materials using by the invention is cheap, the source is extensive, the modification process is simple, the technology is stable and reliable; the adsorptive capacity of the prepared modified adsorbent is high and it has features of high efficiency, wide applicability, pollution-free and environmentally friendly,etc.

Description

technical field [0001] The invention relates to the treatment of industrial waste water, in particular to a preparation method of a modified peat adsorbent. 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 (such as cadmium, lead, copper, zinc, chromium (trivalent and hexavalent), nickel, mercury, arsenic, gold and silver, etc.) is discharged, and these heavy metal ions enter in lar...

Claims

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Application Information

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IPC IPC(8): B01J20/20C02F1/28
CPCY02W10/37
Inventor 张凯松周启星
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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