CN114315091A - Sludge soil chemical dehydration process and treatment system - Google Patents
Sludge soil chemical dehydration process and treatment system Download PDFInfo
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- CN114315091A CN114315091A CN202111391019.XA CN202111391019A CN114315091A CN 114315091 A CN114315091 A CN 114315091A CN 202111391019 A CN202111391019 A CN 202111391019A CN 114315091 A CN114315091 A CN 114315091A
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Abstract
The invention discloses a sludge soil chemical dehydration process and a treatment system. The process utilizes the system, the modified clay is added to improve the flocculation effect of the sludge, and the chemical fertilizer, the organic fertilizer and the modified sandy soil are added to adjust the pH and the porosity of the sludge and neutralize the surface charge of the sludge, so that the dehydration effect of the sludge is greatly improved, the fertility of the sludge is increased, the subsequent fermentation of the sludge is facilitated, and the soil utilization of the sludge is promoted. And the on-site treatment of the sludge is facilitated, and the problem of large investment of sludge treatment equipment and a site is solved.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and relates to a sludge soil-chemical dehydration process and a sludge soil-chemical dehydration treatment system.
Background
As an important component of river regulation, river dredging and large-scale sludge treatment technologies are closely related to the normal use of rivers. The silt of the river is gradually increased, and the flood fighting capability of the river is weakened. Therefore, there is a need to enhance the application of sludge cleaning and sewage treatment technologies in river treatment. The natural water content of the sludge is very high due to the long-term existence of the sludge in the lower layer of the water body. The sludge dewatering not only can greatly reduce the volume of sludge cakes and the transportation and treatment cost, but also is beneficial to the later-period resource utilization of the sludge, and the sludge has great economic and environmental values in the aspect of being used as plant nutrients and soil organic matters. Therefore, a sludge dewatering process is indispensable. The sludge dewatering process mainly comprises a natural dewatering method, a mechanical dewatering method, a vacuum preloading method, a soil engineering pipe bag method and the like. At present, a mechanical dehydration method is mainly adopted, but the energy consumption is large, the equipment and the field investment are large, and the corresponding treatment cost is also higher.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects of the prior art, the invention provides a sludge soil chemical dehydration process and a sludge soil chemical dehydration treatment system, which are prepared by taking soil dug in situ beside a dredging river channel as a raw material.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the first aspect provides a sludge treatment system, which comprises a sludge inlet system, a flocculation precipitation system and a multi-section sludge conditioning and dewatering system which are sequentially connected;
the flocculation and precipitation system comprises an inclined tube flocculation and precipitation device A, an inclined tube flocculation and precipitation device B and an inclined tube flocculation and precipitation device C which are sequentially connected in series, and the inclined tube flocculation and precipitation device A, the inclined tube flocculation and precipitation device B and the inclined tube flocculation and precipitation device C are respectively provided with a flocculant adding port and a water outlet;
the multi-section sludge conditioning and dewatering system comprises a sludge conditioning chamber A, a belt type filter press A, a sludge conditioning chamber B, a belt type filter press B and a sludge conditioning chamber C which are sequentially connected;
the sludge conditioning chamber A, the sludge conditioning chamber B and the sludge conditioning chamber C are provided with dosing ports; water outlet pipes are arranged at the bottoms of the belt type filter press A and the belt type filter press B;
the outlet of the sludge inlet system is connected with the inlet of the inclined tube flocculation precipitation device A; the outlet of the inclined tube flocculation precipitation device C is connected with the inlet of the sludge conditioning chamber A, and the outlet of the sludge conditioning chamber C is connected to a sludge discharge pipe.
In some embodiments, the mud intake system comprises: the device comprises a mud suction pump, a mud suction pipeline and a screen; the screen is arranged at the inlet end of the sludge suction pipeline, the sludge suction pipeline provides power through a sludge suction pump, and the outlet of the sludge suction pipeline is connected to the inlet of the inclined tube flocculation precipitation device A.
In some embodiments, the sludge treatment system further comprises a medicine tank A and a medicine tank B, wherein the medicine tank A is connected with the medicine adding opening of the sludge conditioning chamber A through a medicine adding pipeline A, and the medicine tank B is connected with the medicine adding opening of the sludge conditioning chamber B through a medicine adding pipeline B.
In some embodiments, the sludge treatment system further comprises a sludge discharge pipe, wherein the outlet of the sludge conditioning chamber C is connected to the sludge discharge pipe, and conditioned sludge is discharged from the sludge discharge pipe.
In some embodiments, the sludge treatment system further comprises a drain pipe, and the water outlets of the inclined tube flocculation and precipitation device A, the inclined tube flocculation and precipitation device B and the inclined tube flocculation and precipitation device C are connected to the drain pipe.
In some embodiments, the sludge conditioning chamber a, the sludge conditioning chamber B and the sludge conditioning chamber C are each provided with a stirring device.
In a second aspect, there is provided a sludge-based soil dehydration process using the sludge treatment system, the method comprising:
(1) sludge is extracted from the river channel through a sludge inlet system and is sent into an inclined tube flocculation and precipitation device A:
(2) adding polyacrylamide into the inclined tube flocculation precipitation device A for primary flocculation precipitation, wherein the addition amount of the polyacrylamide is 30mg added in each L of sludge, supernatant liquid of the sludge after the primary flocculation precipitation is discharged from a water outlet, and the sludge after the primary flocculation precipitation enters the inclined tube flocculation precipitation device B;
(3) adding modified fine soil with the mass of 0.6wt% of the sludge and organic fertilizer with the mass of 3wt% of the sludge into the inclined tube flocculation precipitation device B for secondary flocculation precipitation, discharging supernatant after the secondary flocculation precipitation of the sludge from a water outlet, and feeding the sludge after the secondary flocculation precipitation into the inclined tube flocculation precipitation device C;
(4) modified fine-grained soil with the mass of 0.15wt% of the sludge and organic fertilizer with the mass of 2wt% of the sludge are added into the inclined tube flocculation precipitation device C for third flocculation precipitation, supernatant fluid of the sludge after the third flocculation precipitation is discharged from a water outlet, and the sludge after the third flocculation precipitation enters a sludge conditioning chamber A;
(5) adding a chemical fertilizer with the mass of 0.1wt% of the sludge into the sludge conditioning chamber A, uniformly mixing, then feeding the mixture into a belt filter press A for first filter pressing, and pumping the sludge subjected to the first filter pressing into a sludge conditioning chamber B;
(6) adding modified medium-grained soil with the mass of 10wt% of that of the sludge into the sludge conditioning chamber B, uniformly mixing, then feeding the mixture into a belt filter press B for secondary filter pressing, and pumping the sludge subjected to secondary filter pressing into a sludge conditioning chamber C from a pipeline D;
(7) adding 30wt% of modified coarse-grained soil, 0.01wt% of chemical fertilizer and 5wt% of organic fertilizer into the sludge conditioning chamber C, and uniformly mixing.
In some embodiments, the preparation method of the modified fine grained soil, the modified medium grained soil and the modified coarse grained soil is as follows:
taking soil beside a dredging river channel as a main raw material, and pretreating the soil into coarse-grained soil with the particle size of 2-5 mm, medium-grained soil with the particle size of 0.02-2 mm and fine-grained soil with the particle size of less than 0.02 mm;
after a certain amount of modifier and biomass are mixed uniformly, standing for 4-10 h to obtain modified fine-grained soil; wherein the addition amount of the modifying agent is 0.1-5wt% of the fine grained soil, and the addition amount of the biomass is 1-10wt% of the fine grained soil;
adding a certain amount of loosening agent into the medium granular soil, and uniformly mixing to obtain modified medium granular soil; wherein the addition amount of the loosening agent is 1-5wt% of the medium-grained soil;
adding a certain amount of conditioner into the coarse-grained soil, and uniformly mixing to obtain modified coarse-grained soil; wherein the addition amount of the conditioner is 0.5-5wt% of the coarse-grained soil.
The modified fine-grained soil is used as a sludge flocculation stage agent and is directly added into sludge, so that sludge-water separation is promoted; the modified medium-grained soil is added in batches in the sludge extrusion dehydration stage and is used for improving the extrusion dehydration efficiency and the porosity; the mud cake after the mud is extruded and dewatered is crushed and then added with the modified coarse-grained soil for improving the soil improvement and recycling of the mud.
In some embodiments, the modifying agent is a natural polymeric flocculant selected from one or more of chitosan and lignin.
In some embodiments, the biomass is a crop powder, including straw powders of various types.
In some embodiments, the loosening agent is selected from one or more of plant ash, fly ash and activated carbon powder.
In some embodiments, the conditioner is a natural mineral substance selected from one or more of vermiculite and perlite.
The process has the application range of moving along the bank of the river channel, and all the materials are from site construction. Not only can be treated on site, but also can reduce the harm to the environment. The problems that sludge dewatering equipment and a field are large in investment and sludge is difficult to recycle are solved.
Has the advantages that: the sludge soil-chemical dehydration process and the sludge soil-chemical dehydration treatment system provided by the invention can treat sludge along with the riverway coasts, and the added modified clay, organic fertilizer and modified sandy soil are all constructed on site, so that the sludge can be conveniently treated on site, and the problem of large investment in sludge treatment equipment and sites is solved. And by adding the modified clay and the organic fertilizer, the polyacrylamide can improve the flocculation effect of the sludge, and by adding the chemical fertilizer and the modified sandy soil to adjust the pH and the porosity of the sludge and neutralize the surface charge of the sludge, the dehydration effect of the sludge is greatly improved while fertilizing, which is beneficial to the subsequent fermentation of the sludge and the utilization of the soil of the sludge.
Drawings
FIG. 1 is a schematic view of a sludge soil chemical dehydration process device in the embodiment of the invention;
in the figure: the system comprises a sludge suction pump 1, a sludge suction pipeline 2, a screen 3, a flocculation and precipitation system 4, an inclined tube flocculation and precipitation device A41, an inclined tube flocculation and precipitation device B42, an inclined tube flocculation and precipitation device C43, a sludge conveying tube A44, a water discharge pipe 45, a sludge conveying tube B46, a sludge conveying tube C5, a multi-section sludge conditioning and dewatering system 6, a sludge conditioning chamber A61, a belt filter press A62, a sludge conditioning chamber B63, a belt filter press B64, a medicine tank A65, a medicine adding pipeline A66, a pipeline A67, a pipeline B68, a medicine tank B69, a medicine adding pipeline B7, a pipeline C8, a pipeline D9, a sludge conditioning chamber C10, and sewage is discharged from a water outlet pipe 11, a medicine adding port 12 and a sludge discharge pipe 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Unless otherwise specified,% in the present application are mass percentages.
Example 1
As shown in fig. 1, a mobile sludge-based soil-chemical dehydration system comprises a sludge feeding system, a flocculation precipitation system 4 and a multi-section sludge conditioning dehydration system 6 which are connected in sequence;
the flocculation precipitation system 4 comprises an inclined tube flocculation precipitation device A41, an inclined tube flocculation precipitation device B42 and an inclined tube flocculation precipitation device C43 which are sequentially connected in series, and the inclined tube flocculation precipitation device A41, the inclined tube flocculation precipitation device B42 and the inclined tube flocculation precipitation device C43 are respectively provided with a flocculant adding port and a water outlet;
the multi-section sludge conditioning and dewatering system 6 comprises a sludge conditioning chamber A61, a belt filter press A62, a sludge conditioning chamber B63, a belt filter press B64 and a sludge conditioning chamber C10 which are connected in sequence;
the sludge conditioning chamber A61, the sludge conditioning chamber B63 and the sludge conditioning chamber C10 are all provided with a dosing port; the bottom parts of the belt type filter press A62 and the belt type filter press B64 are provided with water outlet pipes 11;
the outlet of the sludge inlet system is connected with the inlet of the inclined tube flocculation precipitation device A; the outlet of the inclined tube flocculation precipitation device C is connected with the inlet of a sludge conditioning chamber A61, and the outlet of the sludge conditioning chamber C10 is connected to a sludge discharge pipe 13.
In some embodiments, as shown in fig. 1, the mud intake system comprises: the device comprises a mud suction pump 1, a mud suction pipeline 2 and a screen 3; the screen is arranged at the inlet end of the sludge suction pipeline, the sludge suction pipeline 2 is powered by the sludge suction pump 1, and the outlet of the sludge suction pipeline 2 is connected to the inlet of the inclined tube flocculation precipitation device A41.
In some embodiments, as shown in fig. 1, the mobile sludge treatment system further comprises a drug tank a65 and a drug tank B69, wherein the drug tank a65 is connected to the drug adding port of the sludge conditioning chamber a61 through a drug adding pipeline a, and the drug tank B69 is connected to the drug adding port of the sludge conditioning chamber B63 through a drug adding pipeline B.
In some embodiments, as shown in fig. 1, the mobile sludge treatment system further comprises a sludge discharge pipe 13, the outlet of the sludge conditioning chamber C10 is connected to the sludge discharge pipe 13, and the conditioned sludge is discharged from the sludge discharge pipe 13.
In some embodiments, as shown in fig. 1, the mobile sludge treatment system further comprises a drain pipe 45, and the water outlets of the inclined tube flocculation settling device a41, the inclined tube flocculation settling device B42 and the inclined tube flocculation settling device C43 are all connected to the drain pipe 45.
In some embodiments, the sludge conditioning chamber a61, sludge conditioning chamber B63, and sludge conditioning chamber C10 are each provided with agitation means. The flocculated sludge may be thoroughly mixed with a conditioner.
Example 2
A sludge-based soil dewatering process using the sludge treatment system of any one of claims 1 to 6, the method comprising:
(1) sludge is extracted from the river channel through a sludge inlet system and is sent into an inclined tube flocculation and precipitation device A:
(2) adding polyacrylamide into the inclined tube flocculation precipitation device A for primary flocculation precipitation, wherein the addition amount of the polyacrylamide is 30mg added in each L of sludge, supernatant liquid of the sludge after the primary flocculation precipitation is discharged from a water outlet, and the sludge after the primary flocculation precipitation enters the inclined tube flocculation precipitation device B;
(3) adding modified fine soil with the mass of 0.6wt% of the sludge and organic fertilizer with the mass of 3wt% of the sludge into the inclined tube flocculation precipitation device B for secondary flocculation precipitation, discharging supernatant after the secondary flocculation precipitation of the sludge from a water outlet, and feeding the sludge after the secondary flocculation precipitation into the inclined tube flocculation precipitation device C;
(4) modified fine-grained soil with the mass of 0.15wt% of the sludge and organic fertilizer with the mass of 2wt% of the sludge are added into the inclined tube flocculation precipitation device C for third flocculation precipitation, supernatant fluid of the sludge after the third flocculation precipitation is discharged from a water discharge port, and the sludge after the third flocculation precipitation enters a sludge conditioning chamber A61;
(5) adding a chemical fertilizer with the mass of 0.1wt% of the sludge into the sludge conditioning chamber A61, uniformly mixing, then feeding the mixture into a belt filter press A62 for first filter pressing, and pumping the sludge subjected to the first filter pressing into a sludge conditioning chamber B63;
(6) adding modified medium-grained soil with the mass of 10wt% of that of the sludge into a sludge conditioning chamber B63, uniformly mixing, then feeding the mixture into a belt filter press B64 for secondary filter pressing, and pumping the sludge subjected to the secondary filter pressing into a sludge conditioning chamber C10 from a pipeline D9;
(7) adding modified coarse-grained soil accounting for 30wt% of the mass of the sludge, a chemical fertilizer accounting for 0.01wt% of the mass of the sludge and an organic fertilizer accounting for 5wt% of the mass of the sludge into a sludge conditioning chamber C10, and uniformly mixing.
In some embodiments, a sludge soil chemical dehydration process includes the steps of:
through suction pump 1, absorb silt from the river course, suction mud pipeline 2 one end is equipped with screen cloth 3, at the in-process of inhaling the mud, separates the large-scale rubbish in the silt, then inputs the silt into flocculation and precipitation system 4, carries out the flocculation and precipitation.
The sludge is conveyed to a flocculation and precipitation system 4 through a lifting pump, polyacrylamide with the concentration of 30 mg/L is added into an inclined tube flocculation and precipitation device A41, and after flocculation and precipitation, the sludge enters an inclined tube flocculation and precipitation device B42 from a sludge conveying tube A44; adding 0.6wt% of modified fine soil and 3wt% of organic fertilizer into an inclined tube flocculation precipitation device B42 for flocculation, and after sludge flocculation precipitation, allowing the sludge to enter an inclined tube flocculation precipitation device C43 from a sludge conveying tube B46; and finally, adding 0.15wt% of modified fine soil and 2wt% of organic fertilizer into the inclined tube flocculation precipitation device C43. The sludge after flocculation and precipitation is pumped into the multi-section sludge conditioning and dewatering system 6 through a sludge conveying pipe C5, and the supernatant is discharged from a drain pipe 45 communicated with a drain outlet at the upper end of each inclined pipe flocculation and precipitation device.
The chemical tank A65 is characterized in that 0.1wt% of chemical fertilizer is added into a sludge conditioning chamber A61 through a dosing pipeline A66, and after being mixed with sludge after flocculation precipitation through a stirring device, the sludge enters a belt type filter press A62 through a pipeline A67 and is subjected to filter pressing; pumping the filter-pressed sludge into a sludge conditioning chamber B63 through a pipeline B68, adding 10wt% of modified medium-grained soil into a conditioning chamber B63 through a medicine adding pipeline B7 by a medicine tank B69 to be mixed with the sludge, and feeding the sludge into a belt type filter press B64 through a pipeline C8 for filter pressing; the filter-pressed sludge is pumped into a sludge conditioning chamber C10 from a pipeline D9, and the sewage is discharged from a water outlet pipe 11 for further treatment.
30wt% of modified coarse-grained soil, 0.01wt% of chemical fertilizer and 5wt% of organic fertilizer are added into the sludge conditioning chamber C10 through the chemical adding opening 12 to be mixed with the sludge, so that the fertility of the sludge can be increased, the porosity can be increased, the subsequent fermentation of the sludge can be promoted, and the soil utilization of the sludge can be promoted. The conditioned sludge is discharged from the sludge discharge pipe 13.
The preparation methods of the modified fine grained soil, the modified medium grained soil and the modified coarse grained soil are as follows:
taking soil beside a dredging river channel as a main raw material, and pretreating the soil into coarse-grained soil with the particle size of 2-5 mm, medium-grained soil with the particle size of 0.02-2 mm and fine-grained soil with the particle size of less than 0.02 mm;
after a certain amount of modifier and biomass are mixed uniformly, standing for 4-10 h to obtain modified fine-grained soil; wherein the addition amount of the modifying agent is 0.1-5wt% of the fine grained soil, and the addition amount of the biomass is 1-10wt% of the fine grained soil; the modifier is a natural polymeric flocculant and is selected from one or a mixture of chitosan and lignin, and the biomass is crop powder.
Adding a certain amount of loosening agent into the medium granular soil, and uniformly mixing to obtain modified medium granular soil; wherein the addition amount of the loosening agent is 1-5wt% of the medium-grained soil; the loosening agent is selected from one or a mixture of more of plant ash, fly ash and activated carbon powder.
Adding a certain amount of conditioner into the coarse-grained soil, and uniformly mixing to obtain modified coarse-grained soil; wherein the addition amount of the conditioner is 0.5-5wt% of the coarse-grained soil. The conditioner is natural mineral, and is selected from one or more of vermiculite and perlite.
The modified fine-grained soil is used as a sludge flocculation stage agent and is directly added into sludge, so that sludge-water separation is promoted; the modified medium-grained soil is added in batches in the sludge extrusion dehydration stage and is used for improving the extrusion dehydration efficiency and the porosity; the mud cake after the mud is extruded and dewatered is crushed and then added with the modified coarse-grained soil for improving the soil improvement and recycling of the mud.
The principle of the embodiment is as follows: polyacrylamide is added into the inclined tube flocculation precipitation device A, and the particle size of sludge particles can be changed by virtue of the adsorption and bridging action of molecules of the polyacrylamide, so that the sludge is subjected to primary mud-water separation; modified clay and organic fertilizer are added into the inclined tube flocculation precipitation device B, so that the surface charge of the sludge can be neutralized, and double electronic layers are compressed, thereby being beneficial to the aggregation and sedimentation of sludge particles and accelerating the flocculation of the sludge; modified clay and organic fertilizer are added into the inclined tube flocculation and precipitation device C, so that the sludge-water separation effect is enhanced.
0.1wt% of chemical fertilizer is added into the sludge conditioning chamber A, so that the pH value of the sludge can be adjusted, the surface charge of the sludge can be neutralized, and the dehydration performance of the sludge can be optimized; 10wt% of modified medium-grained soil is added into the sludge conditioning chamber B, so that the porosity of the sludge is increased, and the dehydration rate of the sludge is improved.
The three flocculation tanks are progressive layer by layer, so that the sludge can be rapidly and efficiently flocculated and precipitated, the pH of the sludge can be adjusted by modifying sandy soil through a conditioner chemical fertilizer, the porosity of the sludge is increased, the sludge can be rapidly dewatered, and meanwhile, the chemical fertilizer and the sandy soil can also increase the fertility of the sludge, so that the subsequent fermentation of the sludge is facilitated, and the soil utilization of the sludge is promoted.
New and old process dehydration effect comparison table
| Categories | Market sludge dewatering process | The process |
| Water content of treated sludge | 50~70% | 40% |
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the claimed invention.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. A sludge treatment system is characterized by comprising a sludge inlet system, a flocculation precipitation system and a multi-section sludge conditioning and dewatering system which are sequentially connected;
the flocculation and precipitation system comprises an inclined tube flocculation and precipitation device A, an inclined tube flocculation and precipitation device B and an inclined tube flocculation and precipitation device C which are sequentially connected in series, and the inclined tube flocculation and precipitation device A, the inclined tube flocculation and precipitation device B and the inclined tube flocculation and precipitation device C are respectively provided with a flocculant adding port and a water outlet;
the multi-section sludge conditioning and dewatering system comprises a sludge conditioning chamber A, a belt type filter press A, a sludge conditioning chamber B, a belt type filter press B and a sludge conditioning chamber C which are sequentially connected;
the sludge conditioning chamber A, the sludge conditioning chamber B and the sludge conditioning chamber C are provided with dosing ports; water outlet pipes are arranged at the bottoms of the belt type filter press A and the belt type filter press B;
the outlet of the sludge inlet system is connected with the inlet of the inclined tube flocculation precipitation device A; the outlet of the inclined tube flocculation precipitation device C is connected with the inlet of the sludge conditioning chamber A, and the outlet of the sludge conditioning chamber C is connected to a sludge discharge pipe.
2. The sludge treatment system of claim 1 wherein the sludge intake system comprises: the device comprises a mud suction pump, a mud suction pipeline and a screen; the screen is arranged at the inlet end of the sludge suction pipeline, the sludge suction pipeline provides power through a sludge suction pump, and the outlet of the sludge suction pipeline is connected to the inlet of the inclined tube flocculation precipitation device A.
3. The sludge treatment system according to claim 1, further comprising a drug tank A and a drug tank B, wherein the drug tank A is connected with the drug adding port of the sludge conditioning chamber A through a drug adding pipeline A, and the drug tank B is connected with the drug adding port of the sludge conditioning chamber B through a drug adding pipeline B.
4. The sludge treatment system of claim 1 further comprising a sludge discharge pipe to which an outlet of the sludge conditioning chamber C is connected, the conditioned sludge being discharged from the sludge discharge pipe.
5. The sludge treatment system of claim 1 further comprising a drain, wherein the discharge ports of the inclined tube flocculation settling device a, the inclined tube flocculation settling device B and the inclined tube flocculation settling device C are connected to the drain.
6. The sludge treatment system of claim 1 wherein the sludge conditioning chamber A, the sludge conditioning chamber B and the sludge conditioning chamber C are each provided with stirring means.
7. A sludge-based soil dehydration process using the sludge treatment system of any one of claims 1 to 6, the method comprising:
(1) sludge is extracted from the river channel through a sludge inlet system and is sent into an inclined tube flocculation and precipitation device A:
(2) adding polyacrylamide into the inclined tube flocculation precipitation device A for primary flocculation precipitation, wherein the addition amount of the polyacrylamide is 30mg added in each L of sludge, supernatant liquid of the sludge after the primary flocculation precipitation is discharged from a water outlet, and the sludge after the primary flocculation precipitation enters the inclined tube flocculation precipitation device B;
(3) adding modified fine soil with the mass of 0.6wt% of the sludge and organic fertilizer with the mass of 3wt% of the sludge into the inclined tube flocculation precipitation device B for secondary flocculation precipitation, discharging supernatant after the secondary flocculation precipitation of the sludge from a water outlet, and feeding the sludge after the secondary flocculation precipitation into the inclined tube flocculation precipitation device C;
(4) modified fine-grained soil with the mass of 0.15wt% of the sludge and organic fertilizer with the mass of 2wt% of the sludge are added into the inclined tube flocculation precipitation device C for third flocculation precipitation, supernatant fluid of the sludge after the third flocculation precipitation is discharged from a water outlet, and the sludge after the third flocculation precipitation enters a sludge conditioning chamber A;
(5) adding a chemical fertilizer with the mass of 0.1wt% of the sludge into the sludge conditioning chamber A, uniformly mixing, then feeding the mixture into a belt filter press A for first filter pressing, and pumping the sludge subjected to the first filter pressing into a sludge conditioning chamber B;
(6) adding modified medium-grained soil with the mass of 10wt% of that of the sludge into the sludge conditioning chamber B, uniformly mixing, then feeding the mixture into a belt filter press B for secondary filter pressing, and pumping the sludge subjected to secondary filter pressing into a sludge conditioning chamber C from a pipeline D;
(7) adding 30wt% of modified coarse-grained soil, 0.01wt% of chemical fertilizer and 5wt% of organic fertilizer into the sludge conditioning chamber C, and uniformly mixing.
8. The sludge soil chemical dehydration process of claim 7, wherein the preparation method of the modified fine-grained soil, the modified medium-grained soil and the modified coarse-grained soil is as follows:
taking soil beside a dredging river channel as a main raw material, and pretreating the soil into coarse-grained soil with the particle size of 2-5 mm, medium-grained soil with the particle size of 0.02-2 mm and fine-grained soil with the particle size of less than 0.02 mm;
after a certain amount of modifier and biomass are mixed uniformly, standing for 4-10 h to obtain modified fine-grained soil; wherein the addition amount of the modifying agent is 0.1-5wt% of the fine grained soil, and the addition amount of the biomass is 1-10wt% of the fine grained soil;
adding a certain amount of loosening agent into the medium granular soil, and uniformly mixing to obtain modified medium granular soil; wherein the addition amount of the loosening agent is 1-5wt% of the medium-grained soil;
adding a certain amount of conditioner into the coarse-grained soil, and uniformly mixing to obtain modified coarse-grained soil; wherein the addition amount of the conditioner is 0.5-5wt% of the coarse-grained soil.
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