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Residual sludge cell wall breaking method

A technology for excess sludge and cells, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of long sludge residence time, complicated operation and management, and large pool volume. Achieve the effect of reduced sludge volume, high efficiency and improved dewatering performance

Active Publication Date: 2012-07-11
SCIMEE TECH & SCI CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Its treatment cost accounts for 25% to 40% of the total operating cost of the sewage treatment plant, even as high as 60%; the mesothermic anaerobic digestion process for sludge commonly used has the disadvantages of slow reaction speed and too long residence time of sludge in the tank. Disadvantages such as large pool volume, complex operation and management, and low methane content in gas production

Method used

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  • Residual sludge cell wall breaking method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Fe with a particle size of 45um 3 O4 powder is added in the magnetic powder buffer tank 12, and the Fe is regulated by the magnetic powder agitator 13 and the magnetic powder supplementary water inlet 14. 3 Concentration of O4 powder according to Fe 3 The weight ratio of O4 powder to residual sludge is 5%. 3 O4 powder into the sludge breaking device 2, there are two sets of cutting blades 3 rotating at high speed in the sludge breaking device 2, the speed of the driving motor 1 5 is controlled at 750r / min, and the speed of the driving motor 2 6 is controlled at 750r / min, the rotation direction of drive shaft one 4 is opposite to the rotation direction of drive shaft two 7. The remaining sludge enters the sludge breaking device 2 from the sludge inlet 1, and the mixer 17 mixes the sludge with Fe 3 After the O4 powder is mixed, under the action of the cutting blade 3, the Fe 3 O4 powder exerts strong impact, shear and friction on the sludge to achieve rapid wall brea...

Embodiment 2

[0025] In the present embodiment, do not add magnetic powder, specifically as follows:

[0026] The remaining sludge enters the sludge breaking device 2 from the sludge inlet 1. The sludge breaking device 2 is composed of two sets of cutting blades 3 rotating at high speed. The speed of the driving motor 5 is controlled at 750r / min, and the driving motor The rotating speed of two 6 is controlled at 750r / min, and the direction of rotation of drive shaft one 4 is opposite to the direction of rotation of drive shaft two 7. The broken sludge flows out from the sludge outlet 8 at the top of the sludge breaking device.

[0027] Sampling 200ml at the sludge outlet 8, measuring the SCOD value of the supernatant soluble organic oxygen consumption, sampling 200ml at the sludge inlet 1, measuring the total organic oxygen consumption TCOD of the mixed solution. The ratio of SCOD / TCOD is the wall breaking rate, and the wall breaking rate of the remaining sludge after testing is 2.48%.

Embodiment 3

[0029] γ-Fe with a particle size of 100um 2 o 3 The powder is added into the magnetic powder buffer tank 12, and the γ-Fe 2 o 3 Powder concentration, according to γ-Fe 2 o 3 The weight ratio of powder to remaining sludge is 5%. Add γ-Fe through the magnetic powder feeding port 16 2 o 3 Powder into the sludge breaking device 2, there are two groups of cutting blades 3 rotating at high speed in the sludge breaking device 2, the speed of the driving motor 1 5 is controlled at 800r / min, and the speed of the driving motor 2 6 is controlled at 800r / min min, the rotation direction of drive shaft one 4 is opposite to the rotation direction of drive shaft two 7 . The remaining sludge enters the sludge breaking device 2 from the sludge inlet 1, and the mixer 17 mixes the sludge with γ-Fe 2 o 3 After powder mixing, under the action of cutting blade 3, γ-Fe 2 o 3 The powder has a strong impact, shear, friction and other effects on the sludge to achieve rapid wall breaking of the...

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Abstract

The invention belongs to the field of sewage treatment and in particular relates to a novel residual sludge cell wall breaking method. The invention provides the novel residual sludge cell wall breaking method and also further discloses a residual sludge cell wall breaking device. After residual sludge cell walls are broken by magnetic powders, the residual sludge digestion reaction time is greatly shortened, and the methane gas production rate in a sludge digestion process can be increased by organic matters dissolved out in residual sludge cells. The residual sludge cell wall breaking device is simple and convenient to operate and high in efficiency, and is suitable for industrial large-batch production.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a novel method for breaking cell walls of excess sludge. Background technique [0002] Activated sludge method is currently the most widely used sewage biological treatment technology in the world, but its disadvantage is that it will produce a large amount of surplus activated sludge. These excess activated sludge usually contain a certain amount of toxic and harmful substances (such as parasite eggs, pathogenic microorganisms, heavy metals) and unstabilized organic matter. If not properly treated and disposed of, it will cause direct or potential pollution to the environment. . [0003] Activated sludge is a general term for microbial groups and the organic and inorganic substances they are attached to. Microbial groups mainly include bacteria, protozoa and algae. Among them, bacteria and protozoa are the two main categories. From the appearance, activated sludge looks like ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 倪明亮黄光华张科
Owner SCIMEE TECH & SCI CO LTD
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