CN112679063A - Sludge reduction system and sludge treatment method - Google Patents
Sludge reduction system and sludge treatment method Download PDFInfo
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- CN112679063A CN112679063A CN202110008053.8A CN202110008053A CN112679063A CN 112679063 A CN112679063 A CN 112679063A CN 202110008053 A CN202110008053 A CN 202110008053A CN 112679063 A CN112679063 A CN 112679063A
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Abstract
The invention discloses a sludge reduction system and a sludge treatment method, wherein the sludge reduction system comprises a sludge feeding pipeline, a sludge digestion tank, a sludge conveying pipeline, a sludge heating tank, a sludge circulating pipeline and a sludge discharging pipeline, two outlets, namely a bottom outlet and an upper outlet, are arranged in the digestion tank, the bottom outlet is connected with the sludge conveying pipeline, and the upper outlet is connected with the sludge conveying pipeline through a sludge digestion liquid conveying pipeline. The invention leads the excess sludge produced in the sewage treatment plant to pass through the digestion tank, adopts the medium temperature fermentation to carry out the reduction and stabilization treatment, thereby greatly reducing the sludge yield, and simultaneously the digested sludge can be outsourced treatment or returned to the anaerobic reactor to be supplemented as anaerobic bacteria. Thereby realizing the purposes of reducing treatment of the excess sludge and high-efficiency recycling. The final sludge treatment cost is reduced, and residual sludge after digestion in the system can be returned to the existing anaerobic system again, so that the system treatment efficiency is improved.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a system for reducing sludge through mesophilic digestion and a method for treating sludge.
Background
The solid waste sludge is an inherent biochemical product of each sewage plant, and if the solid waste sludge is directly disposed without reduction treatment, the treatment capacity is large, the treatment cost is high, and the environment is further influenced. Therefore, how to make sludge reduction is always an aim of efforts in various fields of environmental protection, particularly the direction of biological reduction, but the characteristic of high organic matter content of PTA wastewater biochemical sludge makes the PTA wastewater biochemical sludge have unique advantages in the aspect of biological reduction, and the selection of a proper and operable PTA wastewater biochemical sludge reduction and stabilization process technology is urgent.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a sludge reduction system and a sludge treatment method, which achieve the aims of sludge reduction and stabilization and further reduce the treatment cost and the environmental impact.
The purpose of the invention is realized by the following technical scheme: a sludge reduction system comprises a sludge feeding pipeline, a sludge digestion tank, a sludge conveying pipeline, a sludge heating tank, a sludge circulating pipeline and a sludge discharging pipeline, wherein an outlet of the sludge feeding pipeline is connected with the sludge digestion tank;
the digestion tank is internally provided with two outlets, namely a bottom outlet and an upper outlet, the bottom outlet is connected with a sludge conveying pipeline, and the upper outlet is connected with the sludge conveying pipeline through a sludge digestive fluid conveying pipeline.
Furthermore, an upper circulating valve is arranged on the sludge digestion liquid conveying pipeline and used for controlling the output of the sludge digestion liquid in the sludge digestion tank.
Further, a lower circulating valve is arranged on the sludge conveying pipeline, the lower circulating valve is located between the bottom outlet and the feeding valve of the sludge circulating screw pump, and the lower circulating valve is used for controlling discharging of the sludge digestion tank.
Furthermore, a sludge stirring unit is arranged in the sludge digestion tank, the sludge stirring unit is a nitrogen stirring unit or a hydraulic stirring unit, and the sludge digestion tank is the prior art in the field, wherein a nitrogen stirring medium is from nitrogen outside a boundary area, a hydraulic stirring medium is from the reflux quantity of a sludge circulating screw pump, and microorganisms and sludge organic matters are sufficiently decomposed through hydraulic or nitrogen stirring, so that the anaerobic digestion reduction target is achieved.
Furthermore, a sludge circulating screw pump is arranged on the sludge conveying pipeline, has a discharging function and is used for conveying sludge to the sludge heating tank and the sludge discharging pipeline.
Furthermore, a sludge circulating screw pump feeding valve and a sludge circulating screw pump discharging valve are further arranged on the sludge conveying pipeline and used for controlling feeding and discharging of the sludge circulating screw pump.
Further, the sludge circulation screw pump comprises a sludge circulation screw pump I and a sludge circulation screw pump II, and the sludge circulation screw pump I and the sludge circulation screw pump II are connected in parallel. The sludge circulation screw pump I and the sludge circulation screw pump II are respectively provided with a sludge circulation screw pump feeding valve and a sludge circulation screw pump discharging valve which are correspondingly controlled in a one-to-one mode, and the respective sludge circulation screw pumps can be independently controlled through the respective sludge circulation screw pump feeding valves and the respective sludge circulation screw pump discharging valves.
Furthermore, a sludge circulating valve is arranged on the sludge conveying pipeline and located between a discharge valve of the sludge circulating screw pump and the sludge heating tank, and the sludge circulating valve is used for controlling feeding of the sludge heating tank.
Furthermore, a sludge feeding valve is arranged on the sludge feeding pipeline and used for controlling feeding of the sludge digestion tank.
Furthermore, a sludge discharge valve is arranged on the sludge discharge pipeline and used for controlling the discharge of the sludge discharge pipeline.
Further, the sludge heating tank is provided with a heating coil for heating the sludge heating tank, specifically, steam is utilized for heating, the heating coil is a steam pipeline, and a heat source for steam heating can be steam produced in a plant.
Further, the sludge is derived from PTA wastewater biochemical sludge.
The method for treating the sludge by using the sludge reduction system comprises the following steps:
(1) feeding: the sludge can enter a sludge digestion tank of a sludge reduction system (digestion system) through a sludge feed pipe.
(2) Sludge circulation: discharging sludge digestive juice in the sludge digestion tank from an upper outlet, sequentially conveying the sludge digestive juice to a sludge heating tank through a sludge digestive juice conveying pipeline and a sludge conveying pipeline for heat exchange, returning effluent of the sludge heating tank to the sludge digestion tank through a sludge circulating pipeline, and finally keeping the water temperature of the sludge digestion tank stable at 35-39 ℃.
(3) Discharging: the retention time of the sludge in the sludge digestion tank is about 20 days, 5 to 8 percent of sludge with effective volume needs to be discharged every day in the sludge digestion tank, and the sludge digested in the sludge digestion tank is discharged from a bottom outlet through a sludge conveying pipeline and a sludge discharging pipeline in sequence. The discharged sludge is sent to an original anaerobic reactor (sludge digestion tank) after being subjected to filter pressing and then outsourcing treatment, namely, the discharged sludge can be directly discharged into a corresponding reactor (sludge digestion tank) when the anaerobic reactor (sludge digestion tank) in the system needs to supplement the sludge, or the discharged sludge is discharged into the existing desliming device and is sent to a relevant qualification unit for further harmless treatment after being subjected to filter pressing and packaging.
The invention has the beneficial effects that:
the invention leads the excess sludge produced in the sewage treatment plant to pass through the digestion tank, adopts the medium temperature fermentation to carry out the reduction and stabilization treatment, thereby greatly reducing the sludge yield, and simultaneously the digested sludge can be outsourced treatment or returned to the anaerobic reactor to be supplemented as anaerobic bacteria. Thereby realizing the purposes of reducing treatment of the excess sludge and high-efficiency recycling. The final sludge treatment cost is reduced, and residual sludge after digestion in the system can be returned to the existing anaerobic system again, so that the system treatment efficiency is improved.
Drawings
FIG. 1 is a schematic view of the structure of a sludge reduction system according to the present invention.
In the figure: 1. the sludge digestion tank comprises a sludge digestion tank body, 2, a stirring unit, 3, sludge circulating screw pumps I, 4, a sludge heating tank, 5, a sludge circulating pipeline, 6, a sludge discharging pipeline, 7, a heating coil of the sludge heating tank body, 8, an upper circulating valve, 9, a lower circulating valve, 10, a sludge discharging valve, 11, a sludge circulating valve, 12, a sludge feeding valve, 13, a nitrogen gas inlet valve, 14, sludge circulating screw pumps II, 15, sludge circulating screw pump feeding valves I, 16, sludge circulating screw pump feeding valves II, 17, sludge circulating screw pump discharging valves I, 18, sludge circulating screw pump discharging valves II, 19, sludge feeding pipelines, 20, sludge conveying pipelines, 21 and sludge digestion liquid conveying pipelines.
Detailed Description
The following non-limiting examples will allow one of ordinary skill in the art to more fully understand the present invention, but are not intended to limit the invention in any way.
Example 1
As shown in fig. 1, a sludge reduction system comprises a sludge feeding pipeline 19, a sludge digestion tank 1, a sludge conveying pipeline 20, a sludge heating tank 4, a sludge circulating pipeline 5 and a sludge discharging pipeline 6, wherein the sludge is derived from PTA wastewater biochemical sludge, an outlet of the sludge feeding pipeline 19 is connected with the sludge digestion tank 1, a sludge stirring unit 2 is arranged in the sludge digestion tank 1, the sludge stirring unit 2 is a nitrogen stirring unit, nitrogen stirring media are derived from nitrogen outside a boundary area, and microorganisms and sludge organic matters are sufficiently decomposed through nitrogen stirring, so that an anaerobic digestion reduction target is achieved. The exit linkage mud pipeline 20 of sludge digestion pond 1, mud heating tank 4 and mud ejection of compact pipeline 6 are connected respectively in the export of mud pipeline 20, be equipped with heating coil 7 in the mud heating tank 4 for the heating of mud heating tank 4 can be for utilizing steam heating, and heating coil 7 is steam conduit. The outlet of the sludge heating tank 4 is connected with a sludge circulating pipeline 5, and the outlet of the sludge circulating pipeline 5 is connected with a digestion tank. Two outlets are arranged in the digestion tank and are respectively a bottom outlet and an upper outlet, the bottom outlet is connected with the sludge conveying pipeline 20, and the upper outlet is connected with the sludge conveying pipeline 20 through the sludge digestion liquid conveying pipeline. The sludge conveying pipeline 20 is provided with a sludge circulating screw pump, has a discharging function and is used for conveying sludge to the sludge heating tank 4 and the sludge discharging pipeline 6. The sludge circulation screw pump comprises a sludge circulation screw pump I3 and a sludge circulation screw pump II 14, and the sludge circulation screw pump I3 and the sludge circulation screw pump II 14 are connected in parallel. The sludge circulation screw pump feed valve comprises a sludge circulation screw pump feed valve I15 and a sludge circulation screw pump feed valve II 16, the sludge circulation screw pump discharge valve comprises a sludge circulation screw pump discharge valve I17 and a sludge circulation screw pump discharge valve II 18, the sludge circulation screw pump feed valve I15 and the sludge circulation screw pump discharge valve I17 are used for controlling feeding and discharging of the sludge circulation screw pump I3, and the sludge circulation screw pump feed valve II 16 and the sludge circulation screw pump discharge valve II 18 are used for controlling feeding and discharging of the sludge circulation screw pump II 14. The sludge digestion liquid conveying pipeline 22 is provided with an upper circulating valve 8 for controlling the output of the sludge digestion liquid in the sludge digestion tank 1; and a lower circulating valve 9 is arranged on the sludge conveying pipeline 20, the lower circulating valve 9 is positioned between the bottom outlet and a feeding valve of the sludge circulating screw pump, and the lower circulating valve 9 is used for controlling the discharge of the sludge digestion tank. The sludge feeding pipeline is provided with a sludge feeding valve 12 for controlling the feeding of the sludge digestion tank; and a sludge discharge valve 10 is arranged on the sludge discharge pipeline 6 and used for controlling the discharge of the sludge discharge pipeline 6. The sludge conveying pipeline 20 is provided with a sludge circulating valve 11, and the sludge circulating valve 11 is positioned between a discharge valve of a sludge circulating screw pump and the sludge heating tank 4 and is used for controlling feeding of the sludge heating tank 4.
Example 2
As shown in fig. 1, a sludge reduction system comprises a sludge feeding pipeline 19, a sludge digestion tank 1, a sludge conveying pipeline 20, a sludge heating tank 4, a sludge circulation pipeline 5 and a sludge discharging pipeline 6, wherein the sludge is derived from PTA wastewater biochemical sludge, an outlet of the sludge feeding pipeline 19 is connected with the sludge digestion tank 1, a sludge stirring unit 2 is arranged in the sludge digestion tank 1, the sludge stirring unit 2 is a hydraulic stirring unit, a hydraulic stirring medium is returned from a sludge circulation screw pump, and microorganisms and sludge organic matters are sufficiently separated through hydraulic stirring, so that the anaerobic digestion reduction target is achieved. The exit linkage mud pipeline 20 of sludge digestion pond 1, mud heating tank 4 and mud ejection of compact pipeline 6 are connected respectively to the export of mud pipeline 20, be equipped with heating coil 7 in the mud heating tank 4 for the heating of mud heating tank 4, be used for the heating of mud heating tank 4, can be for utilizing steam heating, heating coil 7 is steam conduit. An outlet of the sludge heating tank 4 is connected with a sludge circulating pipeline 5, and an outlet of the sludge circulating pipeline 5 is connected with a digestion tank; two outlets are arranged in the digestion tank and are respectively a bottom outlet and an upper outlet, the bottom outlet is connected with the sludge conveying pipeline 20, and the upper outlet is connected with the sludge conveying pipeline 20 through the sludge digestion liquid conveying pipeline. The sludge conveying pipeline 20 is provided with a sludge circulating screw pump, has a discharging function and is used for conveying sludge to the sludge heating tank 4 and the sludge discharging pipeline 6. The sludge circulation screw pump comprises a sludge circulation screw pump I3 and a sludge circulation screw pump II 14, and the sludge circulation screw pump I3 and the sludge circulation screw pump II 14 are connected in parallel. The sludge circulation screw pump feed valve comprises a sludge circulation screw pump feed valve I15 and a sludge circulation screw pump feed valve II 16, the sludge circulation screw pump discharge valve comprises a sludge circulation screw pump discharge valve I17 and a sludge circulation screw pump discharge valve II 18, the sludge circulation screw pump feed valve I15 and the sludge circulation screw pump discharge valve I17 are used for controlling feeding and discharging of the sludge circulation screw pump I3, and the sludge circulation screw pump feed valve II 16 and the sludge circulation screw pump discharge valve II 18 are used for controlling feeding and discharging of the sludge circulation screw pump II 14. The sludge digestion liquid conveying pipeline 22 is provided with an upper circulating valve 8 for controlling the output of the sludge digestion liquid in the sludge digestion tank 1; and a lower circulating valve 9 is arranged on the sludge conveying pipeline 20, the lower circulating valve 9 is positioned between the bottom outlet and a feeding valve of the sludge circulating screw pump, and the lower circulating valve 9 is used for controlling the discharge of the sludge digestion tank. The sludge feeding pipeline is provided with a sludge feeding valve 12 for controlling the feeding of the sludge digestion tank; and a sludge discharge valve 10 is arranged on the sludge discharge pipeline 6 and used for controlling the discharge of the sludge discharge pipeline 6. The sludge conveying pipeline 20 is provided with a sludge circulating valve 11, and the sludge circulating valve 11 is positioned between a discharge valve of a sludge circulating screw pump and the sludge heating tank 4 and is used for controlling feeding of the sludge heating tank 4.
Example 3
The method for treating sludge using the sludge reduction system of the above embodiment 1 or 2, comprising the steps of:
(1) feeding: the sludge feed valve 12 is opened and sludge can be fed into the sludge digesting tank 1 of the sludge reducing system (digesting system) through the sludge feed pipe 19.
(2) Sludge circulation: the upper circulating valve 8, the sludge circulating screw pump feed valve I15, the sludge circulating screw pump discharge valve I17, the sludge circulating valve 11 or 8, the sludge circulating screw pump feed valve II 16, the sludge circulating screw pump discharge valve II 18 and the sludge circulating valve 11 are opened in sequence, sludge digestion liquid in the sludge digestion tank 1 is discharged from an upper outlet, and is conveyed to the sludge heating tank 4 for heat exchange through a sludge digestion liquid conveying pipeline 21 and a sludge conveying pipeline 20 in sequence, the outlet water of the sludge heating tank 4 returns to the sludge digestion tank 1 through the sludge circulating pipeline 5, and finally the water temperature of the sludge digestion tank 1 is kept stable at 35-39 ℃.
(3) Discharging: the retention time of sludge in the sludge digestion tank 1 is about 20 days, 5 to 8 percent of sludge with effective volume needs to be discharged every day in the sludge digestion tank 1 correspondingly, and the sludge digested in the sludge digestion tank 1 sequentially passes through a sludge conveying pipeline 20 and a sludge discharging pipeline 6 from a bottom outlet and is discharged through a lower circulating valve 9, a sludge circulating screw pump feeding valve I15, a sludge circulating screw pump discharging valve I17, a sludge discharging valve 10 or a lower circulating valve 9, a sludge circulating screw pump feeding valve II 16, a sludge circulating screw pump discharging valve II 18 and a sludge discharging valve 10. The discharged sludge is sent to an anaerobic reactor (sludge digestion tank 1) after being filter-pressed and then outsourced or returned to the original anaerobic reactor, namely, when the anaerobic reactor or the sludge digestion tank 1 in the system needs to supplement the sludge, the sludge can be directly discharged into the corresponding anaerobic reactor or the sludge digestion tank 1, otherwise, the sludge is discharged into the existing desliming device and is sent to a relevant qualification unit for further harmless treatment after being filter-pressed and packed.
Claims (10)
1. A sludge reduction system is characterized by comprising a sludge feeding pipeline, a sludge digestion tank, a sludge conveying pipeline, a sludge heating tank, a sludge circulating pipeline and a sludge discharging pipeline, wherein an outlet of the sludge feeding pipeline is connected with the sludge digestion tank;
the digestion tank is internally provided with two outlets, namely a bottom outlet and an upper outlet, the bottom outlet is connected with a sludge conveying pipeline, and the upper outlet is connected with the sludge conveying pipeline through a sludge digestive fluid conveying pipeline.
2. The sludge reduction system according to claim 1, wherein a sludge circulation screw pump is provided on the sludge transport pipe.
3. The sludge reduction system according to claim 1 or 2, wherein the sludge conveying pipeline is further provided with a sludge circulation screw pump feed valve and a sludge circulation screw pump discharge valve.
4. The sludge reduction system according to claim 1, wherein an upper circulation valve is provided on the sludge digestion liquid conveying pipeline; and a lower circulating valve is arranged on the sludge conveying pipeline.
5. The sludge reduction system according to claim 1, wherein a sludge stirring unit is provided in the sludge digestion tank.
6. The sludge reduction system according to claim 4, wherein the sludge stirring unit is a nitrogen stirring unit or a hydraulic stirring unit.
7. The sludge reduction system according to claim 1, wherein a sludge feed valve is provided on the sludge feed pipe; and a sludge discharge valve is arranged on the sludge discharge pipeline.
8. The sludge reduction system according to claim 1, wherein a heating coil is provided in the sludge heating tank.
9. The sludge reduction system according to claim 1, wherein a sludge circulation valve is provided on the sludge transport pipe.
10. A method for treating sludge using the sludge reduction system as set forth in any one of claims 1 to 9, comprising the steps of:
(1) feeding: the sludge can enter the sludge digestion tank through a sludge feeding pipeline.
(2) Sludge circulation: discharging sludge digestive juice in the sludge digestion tank from an upper outlet, sequentially conveying the sludge digestive juice to a sludge heating tank through a sludge digestive juice conveying pipeline and a sludge conveying pipeline for heat exchange, returning effluent of the sludge heating tank to the sludge digestion tank through a sludge circulating pipeline, and finally keeping the water temperature of the sludge digestion tank to be stable at 35-39 ℃;
(3) discharging: the sludge digested in the sludge digestion tank is discharged from the bottom outlet sequentially through the sludge conveying pipeline and the sludge discharging pipeline.
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| CN202110008053.8A CN112679063A (en) | 2021-01-05 | 2021-01-05 | Sludge reduction system and sludge treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023173951A1 (en) * | 2022-03-16 | 2023-09-21 | 上海市政工程设计研究总院（集团）有限公司 | Digester system, digester system for treating sludge, and method for treating mixed liquor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023173951A1 (en) * | 2022-03-16 | 2023-09-21 | 上海市政工程设计研究总院（集团）有限公司 | Digester system, digester system for treating sludge, and method for treating mixed liquor |
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