Preparation method and use method of urban sewage plant sludge heavy metal stabilizing agent

A technology for heavy metal stabilizer and urban sewage, which is applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of insufficient stability of the existing state, and achieves a simple preparation method without secondary production. The effect of pollution

Inactive Publication Date: 2017-02-22
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its state of existence is not stable enough, and it is vulnerable to environmental changes during the stabilization process so that heavy metals re-enter surface water or groundwater

Method used

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  • Preparation method and use method of urban sewage plant sludge heavy metal stabilizing agent

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specific Embodiment approach

[0074] The using method of the above-mentioned prepared urban sewage plant sludge heavy metal stabilizer of the present invention, its preferred embodiment is:

[0075] The stabilization process of heavy metals in municipal sludge includes the following steps:

[0076] The dewatered sludge with a water content of about 80% retrieved from the sewage treatment plant is naturally air-dried, and then passed through a 20-mesh sieve;

[0077] Evenly add claim 1 to prepare stabilizer in the sieved sludge, the dosage of stabilizer is 0.25%, 0.5%, 1%, 2% of the sieved sludge amount, and according to water: sludge=1.5: Add deionized water at a ratio of 1, and stir evenly;

[0078] Put the sludge added with the stabilizer for a certain period of time, and stir the sludge regularly during this period;

[0079] Dry and grind the sludge that has been stabilized for a certain period of time.

[0080] After the above stabilizers have been stabilized for a certain period of time, the stabil...

Embodiment 1

[0098] Embodiment 1: preparation of carboxymethyl chitosan grafted thiourea (TCMC)

[0099] Carboxymethylation:

[0100] Suspend 10g chitosan in 100mL isopropanol, add 1mol / L NaOH 252mL under stirring (divided into 6 parts, add 1 part every 20min), continue to stir the lye mixture for 10h, then add 12g of solid chloroacetic acid (divided into 5 parts, Add 1 part every 5min). Then the above mixture was heated to 60°C and reacted for 3h. It was then cooled, and 200 mL of deionized water was added thereto, and the pH value of the system was adjusted to 7 with glacial acetic acid. The obtained solution was subjected to suction filtration, and the suction filtered product was first rinsed with 70% ethanol, and then rinsed with absolute ethanol. After suction filtration, the product was put into an oven at a temperature of 55°C for drying to obtain a carboxymethyl shell polysaccharides.

[0101] Preparation of carboxymethyl chitosan grafted with thiourea

[0102] Dissolve 3g of...

Embodiment 2

[0103] Embodiment 2: grafted thiourea chitosan composite activated carbon (TCTS-AC)

[0104] Weigh 0.5g of chitosan, put it into a beaker, then add 25mL of 5% glacial acetic acid, put the beaker on a magnetic stirrer, and add 0.5g of activated carbon powder to it after it becomes gelatinous. Stir until the charcoal is evenly distributed (about 15 minutes). Then thiourea and glutaraldehyde solution (1.5 g of thiourea and 0.5 mL of 25% glutaraldehyde) reacted at 50° C. for 30 minutes were added into the beaker, and the stirring was continued until no solid precipitated out. The precipitate was repeatedly washed with 0.1mol / L NaOH, distilled water and ethanol, filtered with suction, and dried at 55°C to obtain TCTS-AC.

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Abstract

The invention discloses a preparation method and a use method of an urban sewage plant sludge heavy metal stabilizing agent. The preparation method comprises the preparation of carboxymethyl chitosan grafted thiourea and the preparation of grafted thiourea chitosan compounded activated carbon, wherein the preparation of the carboxymethyl chitosan grafted thiourea comprises the steps of carboxymethylation of chitosan, and grafting of thiourea; the preparation of the grafted thiourea chitosan compounded activated carbon comprises the steps of compounding of chitosan and activated carbon, and grafting of thiourea. The use method of the prepared stabilizing agent comprises the following steps of: naturally air-drying sewage sludge taken back from a sewage treatment plant and having a water ratio reaching about 80%, and then screening the dried sludge through a 20-mesh sieve; uniformly adding the stabilizing agent into the screened sludge with the added amount of the stabilizing agent of being 0.25%, 0.5%, 1% and 2% of the amount of the screened sludge, adding deionized water at a water-sludge ratio of 1.5 to 1, and stirring them uniformly; standing the sludge added with the stabilizing agent for a certain period of time, and periodically stirring the sludge uniformly once in this period of time; and drying and grinding the sludge which is stabilized for a certain period of time. The stabilizing agent can stabilize Cd, Ni and Zn at the same time. The preparation method of the stabilizing agent is simple, safe and environmentally friendly, and does not generate secondary pollution.

Description

technical field [0001] The invention relates to a sludge resource utilization technology, in particular to a preparation method and a use method of a heavy metal stabilizer for urban sewage plant sludge. Background technique [0002] In recent years, with the acceleration of my country's economic development and urbanization process, the discharge volume and treatment ratio of urban sewage have increased rapidly, and the sludge output of urban sewage treatment plants has also continued to increase. According to statistics, in 2015, the output of sewage plant sludge in China was about 35 million tons (calculated with a moisture content of 80%). How to dispose of a large amount of sludge and prevent it from causing secondary pollution has become an urgent problem to be solved. At present, the sludge disposal methods mainly include landfill, incineration, throwing into the sea, and land utilization. Among them, the land use of sludge has the advantages of low energy consumpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/00C02F2101/20
Inventor 章丽萍刘青魏含宇戴瑾翟琦航何绪文
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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