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Treatment method for excess activated sludge in AOX pollution

A treatment method and residual activity technology, applied in the fields of environmental engineering and pollution treatment engineering, can solve the problems of large dosage and troublesome subsequent treatment of sludge, and achieve the effect of reducing treatment cost, realizing harmlessness and reducing water content.

Active Publication Date: 2016-04-06
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if fly ash is directly used for sludge conditioning, if it wants to achieve better results, there is a disadvantage of excessive dosage, which will cause great trouble to the subsequent treatment of sludge, so the dosage must be controlled

Method used

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  • Treatment method for excess activated sludge in AOX pollution
  • Treatment method for excess activated sludge in AOX pollution
  • Treatment method for excess activated sludge in AOX pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The AOX content in the remaining activated sludge of a pharmaceutical company is as high as 5347mg / kg (dry sludge), the moisture content of the raw sludge is 95.7%, and the initial pH is 7.8.

[0050] The treatment method of above-mentioned excess activated sludge is as follows:

[0051] (1) Add the modified fly ash of the load iron manganese element of 100mg / g. dry SS in the remaining activated sludge, stir with 180r / min, after mixing evenly, obtain mixed solution; Wherein, by mass fraction, Nano Fe in modified fly ash 3 o 4 The loading is 10%, Mn 2+ The loading amount is 2%.

[0052] After the fly ash is modified, the specific surface area is changed from the original 8.2m 2 / g, increased to 21.5m 2 / g.

[0053] (2) Add 40 mg / g. dry SS H to the mixture 2 o 2 , stirred at 180r / min, and after 2 hours of oxidation reaction, a reaction solution was obtained.

[0054] After 30 minutes of reaction, the pH value of the reaction solution dropped to 3.4; after 2 hours...

Embodiment 2

[0061] In the present embodiment, in terms of mass fraction, the nanometer Fe in the modified fly ash 3 o 4 The loading is 10%, Mn 2+ The loading amount is 5%.

[0062] After the fly ash is modified, the specific surface area is changed from the original 8.2m 2 / g, increased to 22.3m 2 / g.

[0063] Other than that, the rest of the content is the same as in Example 1.

[0064] Treatment results: After treatment, the capillary water absorption time of the sludge decreased from 265.6s to 18.9s, the moisture content of the sludge filter cake decreased to 49.1%, and the sludge AOX removal rate was 76.8%.

[0065] The changes of main pollutants in sludge before and after oxidation treatment are shown in Table 2.

[0066] Table 2 GC-MS detects the changes in compound types and peak areas before and after the treatment of the remaining activated sludge in Example 2

[0067]

Embodiment 3

[0069] In the present embodiment, in terms of mass fraction, the nanometer Fe in the modified fly ash 3 o 4 The loading is 5%, Mn 2+ The loading amount is 1%.

[0070] After the fly ash is modified, the specific surface area is changed from the original 8.2m 2 / g, increased to 14.5m 2 / g.

[0071] Other than that, the rest of the content is the same as in Example 1.

[0072] Treatment results: After treatment, the capillary water absorption time of the sludge decreased from 265.6s to 80.2s, the moisture content of the sludge filter cake decreased to 60.2%, and the sludge AOX removal rate was 66.2%.

[0073] The changes of the main pollutants in the sludge before and after treatment are shown in Table 3.

[0074] Table 3 GC-MS detects the change of compound type and peak area before and after the remaining activated sludge treatment in Example 3

[0075]

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Abstract

The invention discloses a treatment method for excess activated sludge in AOX pollution. The method comprises the steps that modified fly ash carrying ferro-manganese elements is added in the excess activated sludge and evenly mixed, then an oxidant is added for an oxidation reaction, a framework agent is added into a reaction solution after the reaction is completed, the pH value is regulated to range from 8 to 9, plate frame pressure filtration is carried out, and filter liquor and a sludge filter cake are obtained. According to the treatment method, before a fenton-like / persulfate advanced oxidation reaction, the modified fly ash carrying nanometer Fe3O4 and Mn2+ is adopted, so that the adsorption capability and the catalyzing capability of original fly ash are improved, and thus pollutants in the sludge and the sludge are efficiently degraded; organic pollutants in the excess activated sludge are effectively removed, and the water content of the sludge is reduced; harmless and reducing treatment of the sludge and the recycling comprehensive utilization of the fly ash are achieved.

Description

technical field [0001] The invention relates to the fields of environmental engineering and pollution treatment engineering, in particular to a treatment method for excess activated sludge polluted by AOX. Background technique [0002] Halogenated organic compounds are important chemical raw materials, intermediates and organic solvents, which are widely used in dyestuffs, pharmaceuticals, textiles, printing and dyeing, electronics and other industries, and are extremely polluted in wastewater. There are many kinds of organic halides. Adsorbable organic halides (AOX) are used internationally to represent the total amount of halogenated organic compounds. [0003] AOX is highly fat-soluble, has the "three effects" effect, is difficult to be biodegraded, and is a type of persistent pollutant. European and American countries have established corresponding emission standards for it earlier. Organic halides characterized by AOX have become an international water quality indicato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00B01J20/10B01J20/30
CPCB01J20/103C02F11/00
Inventor 徐灿灿刘锐陈吕军
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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