Novel municipal sludge conditioner

A sludge conditioning and new municipal technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve high environmental costs, decline in environmental protection, and is rarely used alone and other problems, to achieve the effect of easy to obtain raw materials, low production cost and good dehydration effect

Inactive Publication Date: 2019-07-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Production of flocculants for improving sludge dewatering performance at the expense of high environmental costs, leading to a decrease in their environmental friendliness
In addition, there is a class of coagulants (diatomaceous earth, lime, gypsum, coal powder, lignite, fly ash, bagasse, wood chips, etc.), or skeleton constructs, which mainly reduce sludge compressibility and build water The way of permeation channel can improve the dewatering performance of sludge, but it has the problem of too much dosage and general improvement effect, so it is rarely used alone

Method used

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  • Novel municipal sludge conditioner
  • Novel municipal sludge conditioner
  • Novel municipal sludge conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The municipal sludge sludge cake is first manually removed from solid impurities, dried in an oven at 105°C to constant weight, taken out, crushed and sieved to obtain pretreated municipal sludge, and then the pretreated municipal sludge The sludge was pyrolyzed at 600 °C for 2 h under an inert gas atmosphere to obtain sludge biochar.

[0033] Weigh 6 parts of 0.6g of sludge biochar, add them to 100mL of activated sludge with pH values ​​of 2, 3, 4, 5, 6 and 7, and stir for 5 minutes at a stirring speed of 100rpm. After the stirring is completed, let it stand for 30 minutes Finally, it was dehydrated to obtain the sludge dehydration rate, and the dehydration rate of activated sludge at different pH values ​​is shown in Table 1.

[0034] Table 1

[0035] Activated sludge pH value 2 3 4 5 6 7 Moisture content of activated sludge (%) 70.72 68.98 73.64 74 75.38 74.46

[0036] It can be concluded from Table 1 that in the activated sludge with...

Embodiment 2

[0038] The municipal sludge sludge cake is first manually removed from solid impurities, dried in an oven at 105°C to constant weight, taken out, crushed and sieved to obtain pretreated municipal sludge, and then the pretreated municipal sludge The sludge was pyrolyzed at 600 °C for 2 h under an inert gas atmosphere to obtain sludge biochar.

[0039] Measure 6 parts of 100mL activated sludge with a pH value of 3, add 0.25g, 0.5g, 0.6g, 0.8g, 1.0g and 1.3g of sludge biochar and stir at a stirring speed of 100rpm for 5min, after the stirring is completed , after standing for 30min, it was dehydrated to obtain the sludge dehydration rate, and the dehydration rate of different quality sludge biochar activated sludge is shown in Table 2.

[0040] Table 2

[0041] Activated sludge (g) 0.25 0.5 0.6 0.8 1.0 1.3 Moisture content of activated sludge (%) 70.44 71.23 67.80 61.66 59.94 72.2

[0042] It can be concluded from Table 2 that in the activated slu...

Embodiment 3

[0044] The municipal sludge sludge cake is first manually removed from solid impurities, dried in an oven at 105°C to constant weight, taken out, crushed and sieved to obtain pretreated municipal sludge, and then the pretreated municipal sludge Sludge biochar was obtained under different pyrolysis conditions in an inert gas atmosphere (see Table 3 for specific conditions).

[0045] Measure 100mL of activated sludge with a pH value of 3, add 1.0g of sludge biochar under the above different pyrolysis conditions and stir for 5min at a stirring speed of 100rpm, after the stirring is completed, let it stand for 30min, then dehydrate it After treatment, the dehydration rate of the sludge was obtained, and the dehydration rate of the sludge biochar activated sludge under different pyrolysis conditions is shown in Table 3.

[0046] table 3

[0047] Pyrolysis temperature (℃) 300 400 500 500 600 800 900 Pyrolysis time (h) 4 3 3 2 2 2 1 Moisture content...

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Abstract

The invention discloses a novel municipal sludge conditioner. The novel municipal sludge conditioner comprises a sludge biochar and ferrate, the mass ratio of the sludge biochar to the ferrate is 2-130:3, and the sludge biochar is prepared by the following steps that pretreated municipal sludge is pyrolyzed at 300-900 DEG C for 1-4 hours in an inert gas atmosphere. The municipal sludge conditionerbased on the municipal sludge as a raw material provides a novel way for the treatment and disposal of sludge dewatering and resource utilization.

Description

[0001] Technical field: [0002] The invention relates to the technical field of urban solid waste disposal and resource utilization, in particular to a novel municipal sludge conditioner. [0003] Background technique: [0004] The discharge of domestic sewage in major cities in my country has increased at an annual growth rate of more than 5.3% since 2010. In 2016, the discharge of domestic sewage reached 17.684 billion tons. According to the estimate of 0.3%, the output of municipal sludge is about 53.05 million tons. The water content of concentrated municipal sludge is still as high as 95% to 97%. Landfill treatment requires that the water content of sludge should not be higher than 60%, and incineration treatment requires a water content of less than 50%. The moisture content must consume a lot of heat due to moisture vaporization. Excessive moisture content brings great challenges to sludge subsequent treatment and disposal, especially energy utilization such as incine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/143
CPCC02F11/10C02F11/14Y02W10/40
Inventor 袁浩然吴佳欢顾菁陈勇
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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