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A kind of deep dehydration method of municipal sludge

A technology of municipal sludge and deep dewatering, applied in biological sludge treatment, dewatering/drying/concentrating sludge treatment, etc. The increase in the proportion of inorganic substances in the cake has achieved the effect of facilitating subsequent resource utilization, mild reaction, and low risk of secondary pollution.

Active Publication Date: 2017-07-07
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical method needs to add a large amount of chemicals, which will easily increase the amount of sludge dry matter and the proportion of inorganic matter in the sludge filter cake, greatly reduce the organic matter and calorific value, and affect the utilization of sludge resources

Method used

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  • A kind of deep dehydration method of municipal sludge
  • A kind of deep dehydration method of municipal sludge
  • A kind of deep dehydration method of municipal sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 (in the dehydration process, the ratio of sulfur powder and pyrite powder and the research on the input amount of inoculum)

[0028] The sludge used in this experiment was taken from the residual sludge in the secondary sedimentation tank of a certain urban sewage plant, and its basic properties are shown in Table 1.

[0029] Table 1 Basic properties of the tested sludge

[0030]

[0031] The orthogonal test factors and levels of this experiment are shown in Table 2.

[0032] Table 2 Orthogonal test factors and levels

[0033]

[0034] The scheme of this experiment is shown in Table 3.

[0035] Table 3 Orthogonal experiment design scheme

[0036]

[0037] The specific process of the above nine test programs is as follows:

[0038] (1) Take 150mL of the test sludge with the properties shown in Table 1, add 1.5g of sulfur powder and 1.5g of pyrite powder respectively, place it in a water bath shaker at a speed of 180r / min, and shake the flask at ...

Embodiment 2

[0049] 1. The sludge to be tested is taken from the residual sludge in the primary sedimentation tank of a sewage plant, and its basic properties are shown in Table 6.

[0050] Table 6 Basic properties of test sludge (residual sludge in primary sedimentation tank)

[0051]

[0052] 2. Dehydration treatment

[0053] (1) Take 150mL of the test sludge with the properties shown in Table 6, add 1.5g of sulfur powder and 1.5g of pyrite powder respectively, place it in a water bath shaker and shake the flask at a constant temperature of 28°C at a speed of 180r / min Cultivate; when the pH value of the sludge system is 2.5, end the first cultivation, and obtain the 20mL culture; then, add 130mL of the test sludge with the properties shown in Table 6 to the first culture, and use the same Conditions carry out secondary shake flask culture; Finally, add 6.5 volumes of the test sludge of the character shown in Table 6 to the culture for the second time and repeat the shake flask culture ...

Embodiment 3

[0059] The sludge to be tested was taken from the residual sludge in the secondary settling tank of a sewage plant, which adopted the improved A 2 / O process, no chemicals were added during the treatment process. The basic properties of the above sludge are shown in Table 7.

[0060] Table 7 Basic properties of the test sludge (residual sludge in the secondary settling tank)

[0061]

[0062] 2. Dehydration treatment

[0063] (1) Take 150mL of the test sludge with the properties shown in Table 7, add 1.5g of sulfur powder and 1.5g of pyrite powder respectively, and shake the flask in a water bath shaker at a constant temperature of 28°C at a speed of 180r / min Cultivate; when the pH value of the sludge system is 2.5, end the first cultivation, and obtain the 20mL culture; then, add 130mL of the test sludge with the properties shown in Table 7 to the first culture, and use the same Conditions carry out secondary shake flask culture; Finally, add 6.5 volumes of the test slu...

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Abstract

The present invention relates to a kind of deep dehydration method of city sludge, and this method is made up of following steps: (1) take city sludge and add sulfur powder 10g and pyrite powder 10g respectively according to its volume per liter of city sludge, place Shake flask culture in a water bath shaker at a constant temperature of 28°C; when the pH value of the sludge system is 2.5, end the first culture; then, add 6.5 times the volume of new municipal sludge to the first culture, Adopt the same condition to carry out secondary shaking flask culture; Finally, add 6.5 times of volumes of new urban sludge to the second culture and repeat the shaking flask culture once to obtain the inoculum; (2) the obtained inoculum in step (1) The inoculum is dropped into 9 times the volume of urban sludge to be dehydrated, after mixing evenly, add 1g of sulfur powder and 6g of pyrite powder per liter according to the total volume of the inoculum and the urban sludge to be dehydrated; Continue to shake and cultivate for 72 hours at a constant temperature of 28°C in a water-bath shaker; (3) dehydrate the sludge treated in step (2) with a filter press with a filter area of ​​0.5m2. The pressure is 0.35MPa, the mud entry time is 30min, and the pressure holding time is 10min.

Description

technical field [0001] The invention relates to sludge dehydration treatment, in particular to an urban sludge dehydration method with chemical reagents added. Background technique [0002] Municipal sludge comes from a large amount of sludge produced in the sewage treatment process, and its quantity accounts for about 0.3% to 0.5% of the total treated water (based on a moisture content of 97%). According to the source can be divided into: [0003] ① The primary sedimentation sludge comes from the primary sedimentation tank; [0004] ② The remaining activated sludge comes from the secondary sedimentation tank of the activated sludge process; [0005] ③Humic sludge, from the secondary sedimentation tank of the biofilm process; [0006] The above three kinds of sludge can be collectively referred to as raw sludge or fresh sludge. [0007] ④ Digested sludge, raw sludge is called digested sludge or cooked sludge after anaerobic digestion or aerobic digestion. [0008] ⑤Chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F11/12
Inventor 石明岩彭一钊罗佳文张露露蔡彩媛杨凤霞刘恒甫胡淑茵
Owner GUANGZHOU UNIVERSITY
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