Pretreatment method of sludge

A pretreatment and sludge technology, applied in the direction of sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of poor treatment effect and high treatment cost, and achieve improved biodegradability, good The effect of biodegradability

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new sludge pretreatment method in order to overcome the d

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The magnetic catalyst particles can be prepared according to conventional methods. The preparation method of the magnetic catalyst particles may include: preparing a solution of a soluble salt of the corresponding metal, then adding a precipitant dropwise to the obtained solution, stirring and reacting to obtain a precipitate, washing the precipitate, roasting, and then grinding into particles of appropriate size to obtain the magnetic catalyst particles. The soluble salt may be at least one of metal chloride, sulfate and nitrate, preferably metal nitrate. The precipitating agent can be various substances capable of causing precipitation of corresponding metal ions, such as sodium hydroxide.

[0021] In the method, before performing the oxidation reaction, it is necessary to adjust the pH value of the sludge to be above 8. When the pH value of the sludge is less than 8, the effect of the oxidation reaction is poor, so it is difficult to significantly improve the biode...

Embodiment 1

[0029] This example is used to illustrate the pretreatment method of the sludge provided by the present invention.

[0030] (1) Preparation of magnetic catalyst particles

[0031] Dissolve ferric nitrate, copper nitrate, cerium nitrate, lanthanum nitrate and platinum nitrate in distilled water, place the resulting solution in a water bath at 25 ° C, stir at a speed of 300 rpm, and then slowly add a concentration of 30% by weight Hydroxide Sodium solution, adjust the pH value to between 7-8, and let it age for 3 hours. Then, the obtained reaction product was subjected to suction filtration, and the filter cake was washed twice with distilled water, and the suction filtration was repeated; the filter cake obtained after washing was dried in an oven at 105°C for 20 hours, and then placed in a muffle furnace at 550°C Medium roasting for 330 hours. Grind and sieve after the calcination, and obtain the catalyst particles with a particle size of 300 meshes. According to the calculati...

Embodiment 2

[0037] This example is used to illustrate the pretreatment method of the sludge provided by the present invention.

[0038] Magnetic catalyst particles and sludge pretreatment were prepared according to the method of Example 1, except that, in the process of preparing catalyst particles, iron nitrate of the same weight was used instead of copper nitrate, cerium nitrate, lanthanum nitrate and platinum nitrate. As a result, B / C of the pretreated sludge was 0.51.

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Abstract

The invention discloses a pretreatment method of sludge, comprises the following steps: adjusting pH value of the sludge to be more than 8, and performing an oxidizing reaction on the sludge with adjusted pH value and ozone in the presence of magnetic catalyst granules, and magnetically separating a mixture obtained after reaction. According to the pretreatment method disclosed by the invention, the sludge is pretreated so as to obtain the sludge with B/C of 0.5 and more, and the biodegradability of the sludge is obviously improved.

Description

technical field [0001] The invention relates to a pretreatment method of sludge. Background technique [0002] Activated sludge is an inevitable product of the treatment process of secondary sewage treatment plants. Its quantity generally accounts for 0.5% to 1% of the total sewage treatment volume, but its treatment costs account for 40% to 50% of the total operating costs of sewage treatment plants. Traditionally, the disposal methods of urban sewage plant sludge are: direct agricultural use, agricultural use after composting, landfill, ocean disposal, etc. In recent years, incineration has become the main treatment method due to the increasing restrictions imposed on the agricultural use of sludge in developed countries. The reduction and stabilization effect of incineration is very good, but there are disadvantages such as large energy consumption and heavy secondary pollution. The anaerobic digestion method of sludge is currently a commonly used sludge stabilization t...

Claims

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Application Information

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IPC IPC(8): C02F11/00B01J23/89B01J35/00
Inventor 高峰张超
Owner CHINA PETROLEUM & CHEM CORP
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