Silt pretreatment method for enhancing dehydration property and digestibility of silt

A sludge dehydration and digestibility technology, applied in sludge treatment, biological sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of large area of ​​facilities, long sludge residence time, organic matter removal rate Low-level problems, to achieve the effects of reduced disposal costs, shortened anaerobic digestion time, and reduced sludge transportation costs

Inactive Publication Date: 2010-04-28
NINGBO UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0007] On the other hand, anaerobic digestion is usually used to stabilize sludge. The traditional anaerobic digestion process has the following disadvantages: the sludge residence time is long, requiring 20-30 days, so the facility occupies a large area and the infrastructure cost is high; The removal rate of organic matter is low, only about 40%
However, these methods have certain disadvantages: for example, acid-base treatment requires anti-corrosion equipment, high equipment requirements, and subsequent neutralization treatment must be carried out; ultr...

Method used

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  • Silt pretreatment method for enhancing dehydration property and digestibility of silt
  • Silt pretreatment method for enhancing dehydration property and digestibility of silt
  • Silt pretreatment method for enhancing dehydration property and digestibility of silt

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Embodiment 1

[0020] Embodiment 1, get the surplus activated sludge of certain municipal sewage treatment plant, under normal temperature, add 30% hydrogen peroxide solution (0.2-0.8g H 2 o 2 / g dry sludge), stir and mix evenly, and then radiate the above sludge at a microwave frequency of 2450MHz and a temperature of 80°C for 5min. The control sludge did not receive any treatment. The same amount of flocculant (PAM) was added to all sludge for flocculation and sedimentation, followed by mechanical press filtration for dehydration. The results are shown in Table 1.

[0021] Table 1 Hydrogen peroxide dosage (g H 2 o 2 / g dry sludge) to improve the effect of sludge dewaterability

[0022]

Embodiment 2

[0023] Embodiment 2, get the surplus activated sludge of certain urban sewage treatment plant, under normal temperature, add 30% hydrogen peroxide solution (0.5g H 2 o 2 / g dry sludge), stir and mix evenly, and then irradiate the above sludge at microwave frequency 2450MHz and different treatment temperatures (40-120°C) for 5min. The control sludge did not receive any treatment. The same amount of flocculant (PAM) was added to all sludge for flocculation and sedimentation, followed by mechanical press filtration for dehydration. The results are shown in Table 2.

[0024] Table 2 Effect of microwave temperature on improving sludge dewaterability

[0025]

Embodiment 3

[0026] Embodiment 3, get the surplus activated sludge of certain urban sewage treatment plant, under normal temperature, add 30% hydrogen peroxide solution (0.5g H 2 o 2 / g dry sludge), stir and mix evenly, and then radiate the above sludge at a microwave frequency of 2450MHz and 80°C for 2-10min. The control sludge did not receive any treatment. The same amount of flocculant (PAM) was added to all sludge for flocculation and sedimentation, followed by mechanical press filtration for dehydration. The results are shown in Table 3.

[0027] Table 3 Effect of microwave treatment time on improving sludge dewaterability

[0028]

[0029] It can be seen from Table 1-3 that, first of all, with the gradual increase of the amount of hydrogen peroxide, the increase of microwave temperature, and the increase of microwave time, the dehydration performance of sludge will increase accordingly. But when the amount of hydrogen peroxide exceeds 0.6g H 2 o 2 / g dry sludge, when the mic...

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Abstract

The invention relates to a silt pretreatment method for enhancing dehydration property and digestibility of silt and belongs to the field of sewage treatment. The invention is characterized in that when the method is used for enhancing the dehydration property of the remained silt, adding a peroxide solution to the silt (0.4-0.6 g H2HO/g dry silt), evenly stirring, and treating the silt by microwaves at 60-80 DEG C for 3-5 minutes; and when the method is used for enhancing the anaerobic digestion efficiency of the silt, adding a peroxide solution to the silt (0.8-1.2 g H2HO/g dry silt), evenly stirring, and treating the silt by microwaves at 80-120 DEG C for 5-8 minutes. The method enhances the dehydration property of the remained active silt and reduces the amount of the silt by utilizing the feature of high-speed high-efficiency heating and the strong oxidizing action of the free hydroxide radicals resulting from peroxide under microwave radiation. The method can also be used for enhancing the anaerobic digestion efficiency of the subsequent silt, thereby reducing the energy consumption and the amount of the silt. The method has the advantages of simple equipment, convenient operation and maintenance, does not produce any secondary pollution, and has wide application prospects in sewage treatment plants in large, medium-and-small-sized cities, and at sewage treatment stations in enterprises.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and disposal, and relates to a method for pre-treating sludge with microwave / hydrogen peroxide combined technology, in particular to a method of applying microwave / hydrogen peroxide advanced oxidation technology to treat sludge and improve sludge yield. Dehydration and digestibility, so as to reduce the volume and volume of sludge. Background technique [0002] Due to the increase in sewage treatment volume and the improvement of sewage treatment rate, the sludge production in my country has increased sharply in recent years. It is estimated that my country's sludge output will reach 35.6 million tons (80% water content) by 2015. Sludge dehydration can effectively reduce the volume of sludge that needs to be treated and disposed of, and is the most economical method in sludge reduction. In the sludge treatment and disposal methods such as incineration, composting, landfill, and comprehensive...

Claims

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Application Information

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IPC IPC(8): C02F11/06C02F11/14C02F11/12C02F11/04
CPCY02W10/20
Inventor 叶芬霞
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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