CN113277692A - Reservoir sediment-based purification process - Google Patents
Reservoir sediment-based purification process Download PDFInfo
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- CN113277692A CN113277692A CN202110716525.5A CN202110716525A CN113277692A CN 113277692 A CN113277692 A CN 113277692A CN 202110716525 A CN202110716525 A CN 202110716525A CN 113277692 A CN113277692 A CN 113277692A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/16—Treatment of sludge; Devices therefor by de-watering, drying or thickening using drying or composting beds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides a reservoir sediment-based purification process, which comprises the following steps: dredging out upper-layer sediment at the bottom of a reservoir, and adding a sediment purifying agent to the bottom of the reservoir; precipitating the upper-layer bottom sludge to form a first precipitate and a first clarified liquid, and performing micro-nano bubble air flotation treatment on the first precipitate to obtain a second clarified liquid and the first bottom sludge; performing composting treatment on 20% of the first bottom sediment, and performing centrifugal dehydration treatment on the rest first bottom sediment to obtain second bottom sediment and centrifugal clear liquid; curing 15% of the second bottom mud, and performing filter pressing treatment on the remaining second bottom mud to obtain third bottom mud and filter pressing liquid; fifthly, drying 15% of the third bottom mud, and preparing the rest third bottom mud into a ceramsite filter material; and step six, aerating. The invention relates to a purification process which is convenient for purifying reservoir sediment, purifying water bodies by using regenerated products of the sediment and improving the surrounding environment of a reservoir.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a reservoir sediment-based purification process.
Background
The reservoir bottom mud is usually a mixture of clay, silt, organic matters and various minerals, and is formed by depositing on the bottom of a water body through long-term physical, chemical and biological actions and water body transmission, and the traditional treatment mode is dewatering, burying or burning after dredging.
The prior patent (application number: CN201911415230.3) proposes a treatment system and a treatment process for removing polluted bottom mud in lakes, reservoirs and rivers, and the technical scheme of the patent shows that: the treatment system for removing the polluted bottom mud comprises a cutter suction boat, a pre-sieve, a mud storage pool, a drum sieve, a primary hydrocyclone, a fluidized bed separator, a vibrating sieve, a secondary hydrocyclone, a spiral chute, a vacuum belt filter press, a thickener, a dosing device, a stirring tank and a plate and frame filter press. The invention realizes the classified resource utilization of the river and lake bottom mud by separating, sorting and dehydrating the river and lake bottom mud, the sand can be used as a building raw material, the slag can be used for burning, and the coarse particles and mud cakes can be used for filling, thereby conforming to the concept of circular economy.
However, in the above patent, the reservoir sediment cannot be used to purify the water, and the actual application requirements cannot be well satisfied.
Disclosure of Invention
Based on this, the invention aims to provide a reservoir sediment-based purification process to solve the technical problems in the background art.
The invention provides a reservoir sediment-based purification process, which comprises the following steps:
step one, a reservoir sediment dredging and purifying process:
dredging out the upper layer bottom sediment at the bottom of the reservoir, and simultaneously adding a bottom sediment purifying agent into the residual bottom sediment at the bottom of the reservoir;
step two, a precipitation air floatation process:
discharging the upper-layer bottom sludge into a precipitation floatation tank for precipitation to form a first precipitate and a first clarified liquid, and performing micro-nano bubble floatation treatment on the first precipitate after pumping the first clarified liquid to obtain a second clarified liquid and the first bottom sludge with the water content of 66-72%;
step three, a bottom mud treatment process with the water content of 66% -72%:
pumping 20% of the first bottom sludge into a composting pool for composting, and simultaneously carrying out centrifugal dehydration treatment on the remaining first bottom sludge to obtain second bottom sludge with the water content of 50% -55% and centrifugal clear liquid;
step four, a bottom mud treatment process with the water content of 50% -55%:
pumping 15% of second bottom mud into a curing tank, adding a curing agent for curing, and performing filter pressing treatment on the remaining second bottom mud to obtain third bottom mud with the water content of 25% -30% and a filter pressing liquid;
step five, a bottom mud treatment process with the water content of 25% -30%:
pumping and discharging 15% of the third bottom mud into a bottom mud drying box, drying, adding a binder into the remaining third bottom mud in a forming device, stirring and forming to obtain a ceramsite filter material;
step six, an aeration process:
and introducing the first clarified liquid, the second clarified liquid, the centrifugal clear liquid and the filter pressing liquid into an aeration tank, and adding a ceramsite filter material into the aeration tank to carry out aeration biological treatment.
Preferably, forming device includes the extrusion molding bucket, locates the support frame at extrusion molding bucket top, locate a plurality of holes of extruding of extrusion molding bottom of the barrel portion, locate the top cap of support frame bottom is located just be used for driving a plurality of telescoping cylinders that the top cap goes up and down on the support frame, locates lift stirring subassembly in the top cap, and locate the subassembly is cut to the fixed length of extrusion molding bottom of the barrel portion. When extrusion moulding, the raw materials are extruded through the extrusion holes under the extrusion of the top cover, and the fixed-length slitting component performs fixed-length slitting on the extruded raw materials to complete moulding. In the preferred embodiment, the forming device can directly form the mixed raw materials while mixing the binder with the third sediment.
Preferably, lift stirring subassembly is including locating the locating plate in the top cap, locates the top cap top just is used for driving a plurality of driving cylinders that the locating plate goes up and down, and locates the agitator disk of locating plate bottom, locate drive agitator disk top and be used for driving agitator disk pivoted driving motor, the annular permutation of agitator disk bottom is equipped with a plurality of material of scraping. In the preferred embodiment, uniform mixing is facilitated by raising and lowering the mixing assembly.
Preferably, the fixed-length slitting assembly comprises a tooth wall slitting disc which is rotatably connected with the bottom of the extrusion molding barrel, a stepping motor arranged on the outer wall of the extrusion molding barrel and a gear disc arranged at the execution end of the stepping motor and meshed with the tooth wall slitting disc. In the preferred embodiment, the fixed-length slitting component is used for conveniently carrying out fixed-length slitting on the extruded raw materials so as to control the forming length according to the forming requirement.
Preferably, in the first step, the sediment decontaminant is a biological community taking zeolite as a biological carrier, and the adding amount of the sediment decontaminant is 200 grams per square meter. In the preferred embodiment, the bottom sediment purifying agent takes zeolite as a biological carrier, so that the bottom sediment can be conveniently sunk into the bottom sediment of the water body, and a biological community on the zeolite carrier can decompose and remove ammonia, nitrite, nitrate, hydrogen sulfide, sulfur compounds, organic matters and other components in the bottom sediment, so that the bottom sediment is purified, the water quality is purified, the odor is eliminated, the oxygen is added to the water body, and the algal bloom is inhibited.
Preferably, in the second step, the precipitation treatment time is 120 minutes, quicklime can be added into the precipitation floatation tank during the precipitation treatment, the addition amount is 120 grams per cubic meter, the micro-nano bubble floatation treatment time is 85 minutes, and the micro-nano bubbles are generated by coupling iron sulfide serving as a catalyst with ozone. In the preferred embodiment, quicklime can be added as a passivator to increase the pH value, so that heavy metals are converted into precipitates such as hydroxides, the effects of passivating the heavy metals and killing pathogenic bacteria are achieved, iron sulfide is used as a catalyst to be coupled with micro-nano bubbles generated by ozone, so that the bottom sludge can be effectively dehydrated, and the bottom sludge can be purified in the dehydration process.
Preferably, in the third step, the composting conditions are that the fermentation is carried out for 3 to 4 days at 30 to 40 ℃, then the fermentation is carried out for 6 to 10 days at 45 to 60 ℃, and finally the natural ventilation is carried out for 15 days. In the preferred embodiment, the compost-treated bottom sediment can be changed into fertilizer, so that the fertilizer can be applied to trees around the reservoir, the growth of plants around the reservoir is facilitated, and the self-purification of the water body of the reservoir by utilizing the natural environment is facilitated.
Preferably, in step three, the centrifugal dehydration conditions are 3500 rpm and 10 minutes. In the preferred embodiment, the moisture content of the bottom mud is further reduced by the centrifugal dewatering treatment.
Preferably, in the fourth step, the curing agent is cement accounting for 5 percent of the total amount of the substrate sludge to be cured, 20 percent of blast furnace slag, 5 percent of lime and 1 percent of carbon black, the curing agent is added into the second substrate sludge and then stirred for 30 minutes at the speed of 15 revolutions per minute, and the pressure filtration condition is 7-10 MPa. In the preferred embodiment, the strength of the sediment after being cured by the curing agent can meet the requirement of filling soil, the curing agent is beneficial to inhibiting and curing heavy metals in the sediment, and filter pressing can be convenient for the sediment to be fully dehydrated to generate mud cakes.
Preferably, in the fifth step, the drying treatment is required to be carried out for 2 hours at 105 ℃, the binder is Guangxi white mud and water glass, the binder is added with the third bottom mud and then stirred for 15 minutes at the speed of 20 revolutions per minute, after uniform mixing, the mixture is molded and sintered into a ceramsite filter material at 1200 ℃, and in the sixth step, 7 Roots fans FSR150 with 15 cubic meters of air intake, 6.5 meters of air pressure and 30 kilowatts of power are adopted for aeration. In the preferred embodiment, the substrate sludge is conveniently prepared into the ceramsite filter material with the gap distribution and the adsorption performance through the binder and the firing, the wastewater generated during the dehydration of the substrate sludge is conveniently treated, and the water body is conveniently purified through the aeration treatment.
Compared with the prior art, the invention has the beneficial effects that:
the treatment process can purify and dredge reservoir sediment, can dehydrate and recycle the dredged sediment, and can improve the surrounding environment of the reservoir, purify the water body and reinforce the building by utilizing the sediment recycling product;
the bottom sediment purifying agent is adopted to purify the bottom sediment of the water body, zeolite is taken as a biological carrier of the bottom sediment purifying agent, the bottom sediment purifying agent is convenient to sink into the bottom sediment of the water body, and a biological community on the zeolite carrier can decompose and remove ammonia, nitrite, nitrate, hydrogen sulfide, sulfur compounds, organic matters and other components in the bottom sediment;
the method has the advantages that while bottom sediment is purified, water quality is purified, odor is eliminated, oxygen is added to the water body, algal blooms are inhibited, the dredged bottom sediment can be subjected to different dehydration processes to obtain bottom sediment with different water contents, the bottom sediment with different water contents can be used for preparing fertilizer, filling soil and ceramsite filter materials, the fertilizer can be used for fertilizing trees around the reservoir, growth of plants around the reservoir is facilitated, natural environment can be utilized for self-cleaning of the water body of the reservoir, the ceramsite filter materials can be used as filter materials in aeration filtration of the water body, and a forming device adopted in the preparation process of the ceramsite filter materials is convenient for mixing a binder and third bottom sediment and can directly form the mixed raw materials;
be convenient for carry out even stirring through the lift stirring subassembly, cut the subassembly through the fixed length and be convenient for carry out the fixed length to the raw materials of extruding and cut to in need control shaping length according to the shaping.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is an overall process flow diagram of the present invention;
FIG. 2 is an isometric view of the forming device of the present invention;
FIG. 3 is an exploded view of the forming device of the present invention;
FIG. 4 is a sectional view of the forming device of the present invention;
FIG. 5 is a sectional view of the lifting/lowering stirring assembly of the present invention;
FIG. 6 is a top view of an extrusion molded barrel construction of the present invention.
Description of the main symbols:
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Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 6, the present invention provides a reservoir sediment-based purification process, which includes the following steps:
step one, a reservoir sediment dredging and purifying process:
dredging out the upper layer bottom sediment at the bottom of the reservoir, and simultaneously adding a bottom sediment purifying agent into the residual bottom sediment at the bottom of the reservoir. In the first step, the bottom sediment purifying agent is a biological community taking zeolite as a biological carrier, and the adding amount of the bottom sediment purifying agent is 200 grams per square meter.
It should be noted that, in this embodiment, the dredger dredges the bottom sediment on the bottom of the reservoir, so as to prevent the bottom sediment on the bottom of the reservoir from affecting the normal operation of the reservoir;
further, the dredger can add a bottom sediment purifying agent into the residual bottom sediment at the bottom of the reservoir according to the input amount of 200 grams per square meter, the bottom sediment purifying agent takes zeolite as a biological carrier and is convenient to sink into the bottom sediment at the bottom of the water body, and a biological community on the zeolite carrier can decompose and remove ammonia, nitrite, nitrate, hydrogen sulfide, sulfur compounds, organic matters and other components in the bottom sediment, so that the dredger can purify the bottom sediment, purify the water quality, eliminate odor, enrich oxygen in the water body and inhibit algal blooms.
Step two, a precipitation air floatation process:
and discharging the upper-layer bottom sludge into a precipitation floatation tank for precipitation to form a first precipitate and a first clarified liquid, and performing micro-nano bubble floatation treatment on the first precipitate after pumping the first clarified liquid to obtain a second clarified liquid and the first bottom sludge with the water content of 66-72%.
In the second step, the precipitation treatment time is 120 minutes, and quicklime can be added into the precipitation floatation tank during the precipitation treatment, wherein the addition amount is 120 grams per cubic meter. In the second step, the air floatation treatment time of the micro-nano bubbles is 85 minutes, and the micro-nano bubbles are generated by coupling iron sulfide serving as a catalyst with ozone.
Step three, a bottom mud treatment process with the water content of 66% -72%:
pumping 20% of the first bottom sludge into a composting pool for composting, and simultaneously carrying out centrifugal dehydration treatment on the rest first bottom sludge to obtain second bottom sludge with the water content of 50% -55% and centrifugal clear liquid. In the third step, the composting conditions are as follows: fermenting at 30-40 deg.C for 3-4 days, heating to 45-60 deg.C, fermenting for 6-10 days, and naturally ventilating for 15 days. In this step, the centrifugal dehydration conditions were 3500 rpm and 10 minutes.
It should be noted that, in this embodiment, the upper layer bottom mud dredged by the dredger is discharged into the precipitation floatation tank, and the quicklime can be added into the precipitation floatation tank according to the dosage of 120 g per cubic meter, and the quicklime can be used as a passivator to increase the pH value, so that the heavy metals are converted into hydroxides and other precipitates, and the effects of passivating the heavy metals and killing pathogenic bacteria are achieved.
Further, sediment and air supporting are handled and are used for having accelerated the dehydration of bed mud, and adopt the micro-nano bubble that uses iron sulfide as catalyst coupling ozone to generate when the air supporting can effectively dewater the bed mud, and can purify the bed mud at the in-process of dehydration.
Furthermore, after the precipitation and air floatation treatment, part of the bottom mud with the water content of 66% -72% can be taken for composting, the bottom mud after the composting treatment can be changed into fertilizer, the fertilizer can be used for fertilizing trees around the reservoir, the growth of plants around the reservoir is facilitated, and the self-purification of the water body of the reservoir by utilizing the natural environment is facilitated. And the other part of the bottom mud with the water content of 66-72 percent can be continuously dehydrated through a centrifugal dehydration process to obtain the bottom mud with the water content of 50-55 percent.
Step four, a bottom mud treatment process with the water content of 50% -55%:
pumping 15% of the second bottom mud into a curing pool, adding a curing agent for curing, and performing filter pressing treatment on the remaining second bottom mud to obtain third bottom mud with the water content of 25% -30% and filter pressing liquid.
In the fourth step, the curing agent is cement which accounts for 5 percent of the total amount of the bottom mud to be cured, 20 percent of blast furnace slag, 5 percent of lime and 1 percent of carbon black, the curing agent is added into the second bottom mud and then stirred for 30 minutes at the speed of 15 revolutions per minute, and in the fourth step, the pressure filtration condition is 7-10 MPa.
In this embodiment, a part of the bottom mud with a water content of 50% -55% can be cured, the strength of the bottom mud cured by using cement of 5% of the total amount of the bottom mud to be cured, blast furnace slag of 20%, lime of 5% and carbon black of 1% as the curing agent can meet the requirement of filling soil, and the curing agent helps to inhibit and cure heavy metals in the bottom mud. And the other part of the bottom sludge with the water content of 50-55 percent can be continuously dehydrated through a filter pressing dehydration process to obtain the bottom sludge with the water content of 25-30 percent.
Step five, a bottom mud treatment process with the water content of 25% -30%:
pumping and discharging 15% of the third bottom mud into a bottom mud drying box, drying, adding a binder into the remaining third bottom mud in a forming device, stirring, forming and then firing to obtain the ceramsite filter material.
In the fifth step, the drying treatment is required to be drying for 2 hours at 105 ℃. The adhesive is Guangxi white mud and water glass, the adhesive is added with the third bottom mud, stirred for 15 minutes at the speed of 20 revolutions per minute, molded after being uniformly mixed, and fired into the ceramsite filter material at the temperature of 1200 ℃.
To foretell forming device, this forming device includes extrusion molding bucket 10, locates the support frame 101 at extrusion molding bucket 10 top, locate a plurality of extrusion holes 102 of extrusion molding bucket 10 bottom, locate the top cap 11 of support frame 101 bottom, locate on support frame 101 and be used for driving a plurality of telescoping cylinders 12 that top cap 11 goes up and down, locate lift stirring subassembly 13 in the top cap 11, and locate the fixed length of extrusion molding bucket 10 bottom cuts subassembly 14.
During extrusion molding, the raw material is extruded through the extrusion holes 102 under the extrusion of the top cover 11, and the fixed-length slitting component 14 performs fixed-length slitting on the extruded raw material to complete the molding.
In addition, the above lifting stirring assembly 13 includes a positioning plate 131 disposed in the top cover 11, a plurality of driving cylinders 132 disposed on the top of the top cover 11 and used for driving the positioning plate 131 to lift, a stirring plate 133 disposed on the bottom of the positioning plate 131, and a driving motor 134 disposed on the top of the extrusion molding barrel and used for driving the stirring plate 133 to rotate, wherein a plurality of scraper blocks 135 are disposed in an annular array at the bottom of the stirring plate 133.
In addition, the fixed-length slitting assembly 14 comprises a tooth wall slitting disc 141 rotatably connected to the bottom of the extrusion molding barrel 10, a stepping motor 142 arranged on the outer wall of the extrusion molding barrel 10, and a gear disc 143 arranged at the execution end of the stepping motor 142 and engaged with the tooth wall slitting disc 141.
It should be noted that, in this embodiment, a part of the bottom mud with a moisture content of 25% to 30% may be used for performing the bottom mud drying process, and since the moisture content of the bottom mud is very low, the drying time of the bottom mud is short, and the energy consumption is low, the dried bottom mud can be directly reused.
Furthermore, the other part of the bottom mud with the water content of 25-30 percent can be subjected to a ceramsite filter material preparation process, the binder and the bottom mud are mixed and molded by a molding device, and the molding device can be fired after molding is completed, so that the bottom mud can be conveniently prepared into the ceramsite filter material with gap distribution and adsorption performance, and the wastewater generated during the dehydration of the bottom mud can be conveniently treated.
Further, when the forming device works, the sediment and the binder are added into the extrusion forming barrel 10, the driving cylinder 132 is started, the driving cylinder 132 drives the positioning plate 131 to descend, the driving motor 134 is started at the moment, the driving motor 134 drives the stirring disc 133 to rotate, the stirring disc 133 stirs and mixes the sediment and the binder, the driving cylinder 132 drives the positioning plate 131 to reset after the mixing is completed, the telescopic cylinder 12 is started after the resetting is completed, and the telescopic cylinder 12 drives the top cover 11 and the lifting stirring assembly 13 to descend so as to extrude the sediment;
meanwhile, the stepping motor 142 is turned on, the stepping motor 142 drives the tooth wall slitting disk 141 to rotate through the gear disk 143, when the tooth wall slitting disk 141 is dislocated with the extrusion hole 102, the sediment is extruded and molded, the tooth wall slitting disk 141 continues to rotate to slit the sediment, the rotating speed of the tooth wall slitting disk 141 can be controlled, the slitting time interval is controlled to control the sediment molding length, when the top cover 11 is about to contact with the bottom of the inner wall of the extrusion molding barrel 10, the driving motor 134 can be turned on, the driving motor 134 drives the stirring disk 133 to rotate, and the scraping block 135 scrapes and extrudes the sediment.
Step six, an aeration process:
introducing the first clarified liquid, the second clarified liquid, the centrifugal clear liquid and the filter pressing liquid into an aeration tank, and adding a ceramsite filter material into the aeration tank for aeration biological treatment; and in the sixth step, 7 Roots fans FSR150 with 15 cubic meters of air intake per minute, 6.5 meters of air pressure and 30 kilowatts of power are adopted for aeration. It should be noted that, in this embodiment, the aeration process may be used to aerate and purify the water, and the ceramsite filter material is used to facilitate the secondary filtration and purification of the water during aeration.
The specific process of the invention is as follows:
dredging out the upper-layer bottom mud at the bottom of the reservoir by using a dredger, so that the influence of the bottom mud at the bottom of the reservoir on the normal operation of the reservoir is avoided;
the dredger can add a bottom sediment purifying agent into the residual bottom sediment at the bottom of the reservoir according to the input amount of 200 g per square meter, the bottom sediment purifying agent takes zeolite as a biological carrier and is convenient to sink into the bottom sediment at the bottom of a water body, and a biological community on the zeolite carrier can decompose and remove ammonia, nitrite, nitrate, hydrogen sulfide, sulfur compounds, organic matters and other components in the bottom sediment, so that the dredger can purify the bottom sediment, purify the water quality, eliminate odor, enrich oxygen in the water body and inhibit algal blooms;
discharging the upper layer bottom mud dredged by the dredger into a precipitation air floatation tank, adding quicklime into the precipitation air floatation tank according to the adding amount of 120 g per cubic meter, wherein the quicklime can be used as a passivator to improve the pH value, so that heavy metals are converted into hydroxides and other precipitates, and the effects of passivating the heavy metals and killing pathogenic bacteria are achieved;
the sediment and air flotation treatment are used for accelerating the dehydration of the bottom mud, and the bottom mud can be effectively dehydrated by adopting micro-nano bubbles generated by coupling iron sulfide as a catalyst with ozone during air flotation, and the bottom mud can be purified in the dehydration process;
after the precipitation and air floatation treatment, part of the bottom mud with the water content of 66-72% can be taken for composting, the bottom mud after the composting treatment can be changed into fertilizer, the fertilizer can be applied to trees around the reservoir, the growth of plants around the reservoir is facilitated, and the self-purification of the water body of the reservoir by utilizing the natural environment is facilitated;
the other part of the bottom mud with the water content of 66-72 percent can be continuously dehydrated through a centrifugal dehydration process to obtain the bottom mud with the water content of 50-55 percent;
the bottom mud with the water content of 50-55% can be partially cured, the strength of the bottom mud cured by adopting cement with 5% of the total amount of the bottom mud to be cured, blast furnace slag with 20%, lime with 5% and carbon black with 1% as curing agents can meet the requirement of filling soil, and the curing agents are beneficial to the inhibition and curing of heavy metals in the bottom mud;
the other part of the bottom mud with the water content of 50-55 percent can be continuously dehydrated through a filter pressing dehydration process to obtain the bottom mud with the water content of 25-30 percent;
the method has the advantages that the sediment with the water content of 25-30% can be partially dried, and the dried sediment can be directly reused due to low water content of the sediment, short drying time and low energy consumption of the sediment;
the other part of the bottom mud with the water content of 25-30 percent can be subjected to a ceramsite filter material preparation process, a forming device is used for mixing the binder and the bottom mud and forming, and the mixture can be fired after the forming is finished, so that the bottom mud can be conveniently prepared into the ceramsite filter material with gap distribution and adsorption performance, and the wastewater generated during the dehydration of the bottom mud can be conveniently treated;
when the forming device works, bottom mud and a binder are added into the extrusion forming barrel 10, the driving cylinder 132 is started, the driving cylinder 132 drives the positioning plate 131 to descend, the driving motor 134 is started at the moment, the driving motor 134 drives the stirring disc 133 to rotate, the stirring disc 133 stirs and mixes the bottom mud and the binder, the driving cylinder 132 drives the positioning plate 131 to reset after the mixing is completed, the telescopic cylinder 12 is started after the resetting is completed, the telescopic cylinder 12 drives the top cover 11 and the lifting stirring assembly 13 to descend so as to extrude the bottom mud, the stepping motor 142 is started at the same time, and the stepping motor 142 drives the tooth wall cutting disc 141 to rotate through the gear disc 143;
when the tooth wall cutting disc 141 and the extrusion hole 102 are dislocated, the sediment is extruded and molded, the tooth wall cutting disc 141 continues to rotate to cut the sediment, and the cutting time interval can be controlled by controlling the rotating speed of the tooth wall cutting disc 141 to control the molding length of the sediment;
when the top cover 11 is about to contact the bottom of the inner wall of the extrusion molding barrel 10, the driving motor 134 can be started, the driving motor 134 drives the stirring disc 133 to rotate, and the scraping block 135 scrapes and extrudes the bottom mud;
the water body can be aerated and purified by the aeration process, and the ceramsite filter material is used for facilitating secondary filtration and purification of the water body during aeration.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A reservoir sediment-based purification process is characterized by comprising the following steps:
firstly, a reservoir sediment dredging and purifying process comprises the following steps:
dredging out the upper layer bottom sediment at the bottom of the reservoir, and simultaneously adding a bottom sediment purifying agent into the residual bottom sediment at the bottom of the reservoir;
step two, a precipitation air floatation process:
discharging the upper-layer bottom sludge into a precipitation floatation tank for precipitation to form a first precipitate and a first clarified liquid, and performing micro-nano bubble floatation treatment on the first precipitate after pumping the first clarified liquid to obtain a second clarified liquid and the first bottom sludge with the water content of 66-72%;
step three, a bottom mud treatment process with the water content of 66% -72%:
pumping 20% of the first bottom sludge into a composting pool for composting, and simultaneously carrying out centrifugal dehydration treatment on the remaining first bottom sludge to obtain second bottom sludge with the water content of 50% -55% and centrifugal clear liquid;
step four, a bottom mud treatment process with the water content of 50% -55%:
pumping 15% of second bottom mud into a curing tank, adding a curing agent for curing, and performing filter pressing treatment on the remaining second bottom mud to obtain third bottom mud with the water content of 25% -30% and a filter pressing liquid;
step five, a bottom mud treatment process with the water content of 25% -30%:
pumping and discharging 15% of the third bottom mud into a bottom mud drying box, drying, adding a binder into the remaining third bottom mud in a forming device, stirring and forming to obtain a ceramsite filter material;
step six, an aeration process:
and (3) introducing the first clarified liquid, the second clarified liquid, the centrifugal clear liquid and the press filtrate into an aeration tank, and adding a ceramsite filter material into the aeration tank to carry out aeration biological treatment.
2. The purification process based on reservoir sediment according to claim 1, wherein the forming device comprises an extrusion forming barrel (10), a support frame (101) arranged at the top of the extrusion forming barrel (10), a plurality of extrusion holes (102) arranged at the bottom of the extrusion forming barrel (10), a top cover (11) arranged at the bottom of the support frame (101), a plurality of telescopic cylinders (12) arranged on the support frame (101) and used for driving the top cover (11) to lift, a lifting stirring assembly (13) arranged in the top cover (11), and a fixed-length cutting assembly (14) arranged at the bottom of the extrusion forming barrel (10).
3. The reservoir sediment-based purification process according to claim 2, wherein the lifting stirring assembly (13) comprises a positioning plate (131) arranged in the top cover (11), a plurality of driving cylinders (132) arranged at the top of the top cover (11) and used for driving the positioning plate (131) to lift, a stirring disc (133) arranged at the bottom of the positioning plate (131), and a driving motor (134) arranged at the top of the driving stirring disc (133) and used for driving the stirring disc (133) to rotate, wherein a plurality of scraping blocks (135) are arranged at the bottom of the stirring disc (133) in an annular array.
4. The reservoir sediment-based purification process according to claim 2, wherein the fixed-length splitting assembly (14) comprises a tooth wall splitting disc (141) rotatably connected with the bottom of the extrusion molding barrel (10), a stepping motor (142) arranged on the outer wall of the extrusion molding barrel (10), and a gear disc (143) arranged at an execution end of the stepping motor (142) and engaged with the tooth wall splitting disc (141).
5. The reservoir sediment-based purification process of claim 1, wherein in the first step, the sediment purifying agent is a biocenosis using zeolite as a biological carrier, and the dosage of the sediment purifying agent is 200 g per square meter.
6. The purification process based on the reservoir sediment as claimed in claim 1, wherein in the second step, the precipitation treatment time is 120 minutes, quicklime is added into the precipitation floatation tank during the precipitation treatment, the addition amount is 120 grams per cubic meter, the micro-nano bubble floatation treatment time is 85 minutes, and the micro-nano bubbles are generated by coupling iron sulfide as a catalyst with ozone.
7. The reservoir sediment-based purification process of claim 1, wherein in the third step, the composting conditions are as follows: fermenting at 30-40 deg.C for 3-4 days, heating to 45-60 deg.C, fermenting for 6-10 days, and naturally ventilating for 15 days.
8. The reservoir sediment-based purification process according to claim 1, wherein in the third step, the centrifugal dehydration conditions are as follows: 3500 rpm, 10 minutes centrifugation time.
9. The reservoir sediment purification process of claim 1, wherein in the fourth step, the curing agent comprises 5% of cement, 20% of blast furnace slag, 5% of lime and 1% of carbon black in the total amount of the sediment to be cured, the curing agent is added into the second sediment and then stirred for 30 minutes at a speed of 15 revolutions per minute, and the filter pressing condition is 7-10 MPa.
10. The reservoir sediment-based purification process as claimed in claim 1, wherein in the fifth step, the drying treatment is drying at 105 ℃ for 2 hours, the binder is Guangxi white mud and water glass, the binder is added with the third sediment and then stirred at 20 rpm for 15 minutes, and after being uniformly mixed, the mixture is molded and sintered at 1200 ℃ to form the ceramsite filter material;
and in the sixth step, 7 fans with air taking quantity of 15 cubic meters per minute, air pressure of 6.5 meters and power of 30 kilowatts are adopted for aeration.
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