Residual sludge wall breaking device for sewage treatment plant

Abstract

The utility model provides an excess sludge wall breaking device for a sewage treatment plant. The excess sludge wall breaking device is characterized by comprising a crushing device, a high-pressure stirring device, a sludge pump, an oxidation treatment device and a centrifugal separation device which are sequentially connected through pipelines, at least one ozone distribution pipe is longitudinally arranged in the oxidation treatment device, the ozone distribution pipe divides the internal space of the oxidation treatment device into at least two wall breaking bins, the tops of every two adjacent wall breaking bins are communicated, and ozone is introduced into the ozone distribution pipe. After excess sludge is subjected to oxidation treatment, granular sludge is changed into dispersive organic matter, centrifugal separation is conducted, the excess sludge is separated from a carbon source, the soil conditioner is prepared after the excess sludge is recycled, a cytoplasm solution is recycled to be used as the carbon source in the anaerobic stage, and the dehydration performance of the excess solid waste residues is remarkably improved. Therefore, comprehensive recycling and deep reduction of the excess sludge are realized.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a residual sludge wall breaking device of a sewage treatment plant. Background Art

[0002] With the rapid development of industrialization in my country, the amount of sewage discharged is increasing. In 2022, the treatment capacity of urban sewage treatment plants in China will be 215 million m 3 / day; the total sewage discharge is 63.93 billion m 3 , the total amount of sewage treated is 62.58 billion m 3 The sewage treatment rate is 97.9%.

[0003] Biological denitrification and phosphorus removal is the most widely used technology in the field of sewage treatment. However, due to insufficient carbon source addition, the nitrogen and phosphorus in the effluent often exceed the emission standard requirements. At the same time, the biological method will produce a large amount of residual sludge, and the cost of residual sludge treatment and disposal accounts for an increasing proportion of the operating cost of the sewage plant. Internal carbon source refers to the carbon source existing in the sewage treatment system itself, including biodegradable dissolved organic carbon in the raw sewage and granular primary sludge and activated sludge separated from the raw sewage, and the usable organic matter freely released after the death or rupture of microorganisms.

[0004] From the perspective of microbiology, the organic components in the residual sludge can be mainly divided into two parts: microbial cell bodies and extracellular polymers (EPS). Among them, EPS, as a macromolecular organic matter, has a relatively stable chemical structure and is a difficult biodegradable component; at the same time, EPS has excellent water retention properties, which has a negative impact on the sludge dehydration and reduction process. However, from another perspective, EPS not only contains rich proteins and polysaccharides, but also has almost all semi-trace and trace elements. It is a natural organic fertilizer that can be used for various types of soil nutrition regulation and improvement. A large amount of volatile fatty acids, including acetic acid, propionic acid, butyric acid, isobutyric acid, etc., are produced during the hydrolysis and acidification of residual sludge. Its added value is not only higher than that of biohydrogen, but also much greater than that of methane. Volatile fatty acids can be used as source carbon in sewage treatment plants by nitrifying bacteria and denitrifying bacteria to remove nitrogen and phosphorus from sewage, so that the effluent meets the discharge standards. Pure residual sludge is difficult to use due to its low solubility. It must be treated by wall breaking to effectively exert its efficiency as a carbon source. Utility Model Content

[0005] The utility model aims to solve the above problems and provides a wastewater treatment plant excess sludge wall breaking device to achieve comprehensive resource utilization and deep reduction of excess sludge. The technical solutions adopted are as follows:

[0006] The residual sludge wall breaking device of a sewage treatment plant is characterized in that it includes a crushing device, a high-pressure stirring device, a sludge pump, an oxidation treatment device and a centrifugal separation device which are connected in sequence through pipelines; at least one ozone air distribution pipe is longitudinally arranged inside the oxidation treatment device, and the ozone air distribution pipe divides the internal space of the oxidation treatment device into at least two wall breaking bins, and the tops of two adjacent wall breaking bins are interconnected, and ozone is introduced into the ozone air distribution pipe; the crushing device is provided with a sewage inlet; and the centrifugal separation device is provided with a first sewage outlet and a second sewage outlet.

[0007] Furthermore, there are two ozone distribution pipes, which are evenly and longitudinally arranged in the oxidation treatment device, and divide the internal space of the oxidation treatment device into three wall-breaking chambers.

[0008] Furthermore, a vibration or stirring device is provided inside the oxidation treatment device.

[0009] Furthermore, transverse and longitudinal stirrers are respectively arranged inside the high-pressure stirring device.

[0010] The beneficial effects of the utility model are:

[0011] 1. After the residual sludge is oxidized and broken, the granular sludge is converted into dispersed organic matter, and centrifuged to separate the extracellular polymers from the cytoplasmic solution after the wall is broken, and the residual sludge is separated from the carbon source. The residual sludge is recycled to prepare soil conditioner, and the cytoplasmic solution is recycled as a carbon source in the anaerobic stage. At the same time, the dehydration performance of the residual solid waste is significantly improved, thereby realizing the comprehensive resource utilization and deep reduction of the residual sludge, so that the internal carbon source in the sludge can be effectively developed and utilized, reducing the discharge of residual sludge and reducing the input of external carbon sources.

[0012] 2. The ozone oxidation treatment device is designed with three wall-breaking chambers to enhance the ozone oxidation wall-breaking efficiency, make full use of ozone and avoid ozone loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : Flowchart of the utility model

[0014] 1 Crushing device 2 High-pressure stirring device 3 Sludge pump 4 Oxidation treatment device 5 Centrifugal separation device 6 Agitator 7 Sewage inlet 8 Ozone pipe 9 First sewage outlet 10 Second sewage outlet 4-1 First wall-breaking chamber 4-2 Second wall-breaking chamber 4-3 Third wall-breaking chamber 4-4 Ozone distribution pipe DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] like Figure 1 As shown, the residual sludge wall breaking device of the sewage treatment plant includes a breaking device 1, a high-pressure stirring device 2, a sludge pump 3, an oxidation treatment device 4 and a centrifugal separation device 5 which are sequentially connected through pipelines.

[0018] The crushing device 1 is provided with a sewage inlet 7, and the remaining sludge is sprayed into the inner box of the crushing device from the sewage inlet 7 at high pressure, and is collided and crushed, so that the activated sludge particles are crushed into uniformly dispersed sludge particles of small particle size.

[0019] The high-pressure stirring device 2 is provided with horizontal and vertical stirrers 6 to cross-stir the sludge. The stirrer 6 breaks up the sludge particles again to ensure that the particle size of the sludge particles entering the next oxidation treatment is less than 100um. The stirring speed is 3000r / min. The stirrers 6 are cross-set in different directions to achieve a better crushing and mixing effect.

[0020] Two ozone air distribution pipes 4-4 are evenly arranged longitudinally inside the oxidation treatment device 4, and the ozone air distribution pipes 4-4 evenly divide the internal space of the oxidation treatment device 4 into three broken wall bins 4-1, 4-2, and 4-3, and the tops of two adjacent broken wall bins are connected. The ozone air distribution pipe 4-4 is externally connected to an ozone generator through an ozone gas pipe 8 to provide ozone for the sludge in the oxidation treatment device 4. A vibration or stirring device is provided inside the oxidation treatment device 4.

[0021] The centrifugal separation device 5 is provided with a first sewage outlet 9 and a second sewage outlet 10. The centrifugal speed is controlled at 3000 r / min.

[0022] The working process of this device is as follows: the residual sludge is sprayed into the internal box of the crushing device from the sewage inlet 7 of the crushing device 1 under high pressure, and collides and crushes, and the activated sludge particles are crushed into uniformly dispersed small-size sludge particles. The crushed sludge flows into the high-pressure stirring device 2, and the sludge is cross-stirred by the stirrer 6. The stirrer 6 breaks the sludge particles again to ensure that the particle size of the sludge particles entering the next oxidation treatment is less than 100um. The sludge pump 3 pumps the sludge into the oxidation treatment device 4 for ozone oxidation treatment, and the ozone distribution pipe 4-4 distributes the sludge evenly. At the same time, vibration or stirring is added in the oxidation treatment device 4 to make the ozone distribution more uniform. First, it is pumped into the first broken wall bin 4-1 for the first ozone oxidation treatment, and the sludge flows into the second broken wall bin 4-2 through the first broken wall bin 4-1 for the second ozone oxidation treatment, and the sludge flows into the third broken wall bin 4-3 through the second broken wall bin 4-2 for the third ozone oxidation treatment. The sludge after three ozone oxidation cell wall breaking treatments flows into the centrifugal separation device 5, which separates the extracellular polymers from the cell wall broken cytoplasmic solution, that is, separates the residual sludge from the carbon source. The residual sludge is discharged through the first sewage outlet 9 and is recovered to prepare a soil conditioner. The cytoplasmic solution is discharged through the second sewage outlet 10 and is recovered and returned to the anaerobic process as a carbon source.

[0023] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications based on the present invention belong to the scope of protection required by the present invention.

Claims

1. Excess sludge wall breaking device for sewage treatment plant, characterized by: The invention comprises a crushing device (1), a high-pressure stirring device (2), a sludge pump (3), an oxidation treatment device (4) and a centrifugal separation device (5) which are connected in sequence through pipelines; at least one ozone air distribution pipe is longitudinally arranged inside the oxidation treatment device (4), the ozone air distribution pipe divides the internal space of the oxidation treatment device (4) into at least two wall-breaking bins, the tops of two adjacent wall-breaking bins are connected, and ozone is introduced into the ozone air distribution pipe; the crushing device (1) is provided with a sewage inlet (7); and the centrifugal separation device (5) is provided with a first sewage outlet (9) and a second sewage outlet (10).

2. The wastewater treatment plant excess sludge wall breaking device according to claim 1, characterized in that: There are two ozone distribution pipes, which are evenly arranged longitudinally in the oxidation treatment device (4) and divide the internal space of the oxidation treatment device (4) into three wall-breaking chambers.

3. The wastewater treatment plant excess sludge wall breaking device according to claim 1, characterized in that: The oxidation treatment device (4) is provided with a vibration or stirring device inside.

4. The wastewater treatment plant excess sludge wall breaking device according to claim 1, characterized in that: The high-pressure stirring device (2) is provided with a transverse stirrer and a longitudinal stirrer respectively.

5. The excess sludge wall breaking device for a sewage treatment plant according to claim 4, characterized in that: The stirring speed of the stirrer is 3000r / min.

6. The excess sludge wall breaking device for a sewage treatment plant according to claim 1, characterized in that: The centrifugal separation device (5) has a centrifugal speed of 3000 r / min.

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