AU2020286312B2 - River/lake sediment plate and frame filter-pressing and dehydrating method - Google Patents
River/lake sediment plate and frame filter-pressing and dehydrating method Download PDFInfo
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- AU2020286312B2 AU2020286312B2 AU2020286312A AU2020286312A AU2020286312B2 AU 2020286312 B2 AU2020286312 B2 AU 2020286312B2 AU 2020286312 A AU2020286312 A AU 2020286312A AU 2020286312 A AU2020286312 A AU 2020286312A AU 2020286312 B2 AU2020286312 B2 AU 2020286312B2
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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
- C02F11/02—Biological treatment
-
- 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
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
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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
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The present invention discloses a river/lake sediment plate and frame filter-pressing and
dehydrating method. The method comprises the following steps: river/lake sediment slurry
enters a slurry transport pipeline after being deslagged, and then is mixed with a flocculant,
5 and the mixture enters a concentration tank for mud-water separation; a supernatant is
transported to a residual water treatment system once the turbidity of the supernatant meets
requirements; when reaching a certain concentration, the slurry enters a mixing tank with a
filter aid added thereto and fully mixed; after full reaction, the slurry enters a plate and frame
filter press; after the filter-pressing and dehydrating are completed, compressed air is
0 introduced to clean filter-pressing grooves; and then the mud cake is unloaded, and the tail
water is transported back to the concentration tank. The filter aid in the present invention is an
environmentally friendly filter aid sediment conditioner, which can effectively accelerate
mud-water separation without affecting the pH value of the mud and water, and greatly reduce
the dosage of the conditioner; and the sediment subjected to mud-water separation can be
5 used as backfill or greening planting soil to realize the resourcization and sustainable
utilization of the river/lake sediment; furthermore, an air compressor is used to introduce
compressed air to clean channels, which means that the air compressor provides a function of
assisting the cleaning of the filter-pressing grooves in addition to the function of pressurizing,
thus making full use of the existing device and energy.
DRAWING OF THE ABSTRACT
dredging of sediment
high-concentration slurry pump
pipeline
solid impurities sediment screening site solid impurities
compositeconsolidation(deslagginsystem) composite consolidation site
centralized treatment pipeline mixer slurry transport centralized treatment
flocculant p In
pipeline
supernatant___________
residual water treatment system afterthetest concentration tank
performed by a
turbidity meter is i
passed highconcentration tail water
slurry pump
star-shaped unloader
filter aid N mixing tank
screw conveyor
feed pump
compressed air generated by an air N plate and frame filter press
compressor
mechanically
transported
mud cake piling site
Description
dredging of sediment
high-concentration slurry pump pipeline
solid impurities sediment screening site solid impurities compositeconsolidation(deslagginsystem) composite consolidation site
centralized treatment pipeline mixer slurry transport centralized treatment flocculant p In pipeline
supernatant___________ residual water treatment system afterthetest concentration tank performed by a turbidity meter is i passed highconcentration tail water slurry pump
star-shaped unloader filter aid N mixing tank screw conveyor
feed pump
compressed air generated by an air N plate and frame filter press compressor
mechanically transported
mud cake piling site
River/lake sediment plate and frame filter-pressing and dehydrating method
Technical field
The present invention relates to the field of ecological dredging of rivers/lakes, and
more specifically, to a river/lake sediment plate and frame filter-pressing and dehydrating
method.
Background Art
When ecological dredging and dehydration is performed on sediment in rivers/lakes,
it is difficult to dehydrate the polluted sediment with high organic matter content, so that
the sediment needs to be adjusted before the filter-pressing and dehydrating so as to
improve a dehydrating performance thereof. Commonly used conditioning methods
include physical conditioning and chemical conditioning. Physical conditioning includes
elutriation, freezing, and thermal conditioning, while chemical conditioning mainly
refers to the addition of chemical agents to sediment to improve a dehydration
performance thereof. The above conditioning methods are both used in practice, but
chemical conditioning method is the mainly used one, for its simple process,
uncomplicated operation, and stable conditioning effect. In chemical conditioning, a
curing agent is usually used to improve the dehydrating efficiency, but the curing agent
will cause both mud cake generated by filter-pressing and water generated by
filter-pressing to be strongly alkaline. The water generated by filter-pressing after the
dehydrating treatment of polluted river/lake sediment is still industrial wastewater, and
the mud cake generated by filter pressing is still industrial solid waste, which severely
restrict the application of the plate and frame filter-pressing process.
Summary of the Invention
An objective of the present invention is to overcome the defects in the prior art and
provide a river/lake sediment plate and frame filter-pressing and dehydrating method.
The technical objectives of the present invention are achieved through the following
technical solutions.
A river/lake sediment plate and frame filter-pressing and dehydrating method,
comprising the following steps: step 1: transporting, by using a high-concentration slurry pump, river/lake sediment slurry to be treated to a sediment screening site through a pipeline and hence into a deslagging system; the deslagging system intercepting solid impurities in the slurry; and the deslagged slurry entering a slurry transport pipeline, wherein in step 1, the solid impurities intercepted in the deslagging system are stockpiled in a composite consolidation site for concentrated treatment when piled up to a certain capacity; and the solid impurities include floating debris, domestic garbage, weeds, relatively large blocks, garbage and particles; step 2: adding a flocculant to the slurry transport pipeline by means of a pipeline mixer; uniformly mixing the flocculant with the deslagged slurry in the slurry transport pipeline and transporting the mixture to a concentration tank for static sedimentation to perform mud-water separation; detecting the turbidity of a supernatant by a turbidity meter; and starting a pump to transport the supernatant to a residual water treatment system if the turbidity of the supernatant meets requirements, or otherwise continuing the static sedimentation until the turbidity of the supernatant meets the requirements, wherein in step 2, the flocculant is a mixture of polyacrylamide and porous biopolymerization agent, the porous biopolymerization agent is an irregular sphere made by uniformly mixing 50-70 wt% agent A and 30-50 wt% agent B, and the pH value of the irregular sphere is 5.0-6.0, in which the agent A is made by uniformly mixing 10-30 wt% cellulose, 20-50 wt% starch and 20-40 wt% amino acid; the agent B is made by uniformly mixing 40-70 wt% glucoamylase and 30-60 wt% citric acid; the particle size of the irregular sphere is 1-3mm; the irregular sphere is crushed into solid particles with a particle size of < 20 mesh; and the usage amount of the flocculant is 0.3%o-0.5%o of the treated sediment, preferably 0.5%o; and flocculants can reduce or eliminate the sedimentation stability and polymerization stability of dispersed particles in water, form relatively large flocs, realize rapid mud-water separation, and also have the advantages of quickly removing coloured substances, SS, COD, BOD, etc., in water; preferably, the agent A is made by uniformly mixing 25 wt% cellulose, 40 wt% starch and 35 wt% amino acid; and the agent B is made by uniformly mixing 65 wt% glucoamylase and 35 wt% citric acid; and wherein in step 2, if the turbidity of the supernatant is less than 70, a pump is started to transport the supernatant to a residual water treatment system, or otherwise the static sedimentation is continued; and in the residual water treatment system, the residual water will be further treated and discharged once discharge standards are reached; step 3: when the slurry in the concentration tank reaches a certain concentration, transporting the slurry to a mixing tank by using a high-concentration slurry pump; adding a filter aid to the mixing tank by means of a star-shaped unloader and a screw conveyor; and then fully mixing the slurry and the filter aid, wherein in step 3, the filter aid contains a sediment conditioner A, a sediment conditioner B, and a sediment conditioner C; and the content of the sediment conditioner A is 30-40 wt%, the content of the sediment conditioner B is 35-50 wt%, and the content of the sediment conditioner C is 20-30 wt%; the sediment conditioner A contains aluminum chloride and iron sulfate, with the content of aluminum chloride being 70-90 wt% and the content of iron sulfate being 10-30 wt%; the sediment conditioner B contains sodium silicate and calcium silicate, with the content of sodium silicate being 10-30 wt% and the content of calcium silicate being 70-90 wt%; and the sediment conditioner C contains bentonite and desulfuration gypsum, with the content of bentonite being 30-60 wt% and the content of desulfuration gypsum being 40-70 wt%; and the aluminum chloride, iron sulfate, sodium silicate, calcium silicate, bentonite and desulfuration gypsum are all solid powders with a particle size below 10 mesh; and the usage amount of the filter aid is 1%-5% of the mass of the treated sediment; filter aids can strengthen the mud-water separation effect generated by flocculation, form rigid particles with a porous cake layer, reduce the dehydration resistance of a mud cake, and enable a filter cake to have a good permeability and relatively low fluid resistance; environmentally-friendly chemical components are used as the filter aid of the present invention, which can effectively improve the water quality of tail water and reduce the pressure of subsequent tail water treatment, and in addition, the components do not contain heavy metals, and new pollutants will not be brought over, so that the properties of the mud cake will not change significantly, thus not affecting the subsequent resourcization utilization of the sediment; preferably, in the filter aid, the content of the sediment conditioner A is 35 wt%, the content of the sediment conditioner B is 40 wt%, and the content of the sediment conditioner C is 25 wt%; preferably, in the sediment conditioner A, the content of aluminum chloride is 75-90 wt%, and the content of iron sulfate is 10-25 wt%; in the sediment conditioner B, the content of sodium silicate is 10-15 wt%, and the content of calcium silicate is 85-90 wt%; and in the sediment conditioner C, the content of bentonite is 45-60 wt%, and the content of desulfuration gypsum is 40-55 wt%; further preferably, in the sediment conditioner A, the content of aluminum chloride is 90 wt%, and the content of iron sulfate is 10 wt%; in the sediment conditioner B, the content of sodium silicate is 12 wt%, and the content of calcium silicate is 88 wt%; and in the sediment conditioner C, the content of bentonite is 55 wt%, and the content of desulfuration gypsum is 45 wt%; and step 4: after the reaction is carried out in the mixing tank for a period of time, transporting, by using a feed pump, the slurry to a plate and frame filter press for filter-pressing and dehydrating treatment, wherein the plate and frame filter press consists of alternately arranged matching plates and diaphragm plates to form a set of filter chambers; there are through holes at the corners of the matching plates and diaphragm plates, which form complete channels after the assembly of the plates, so that a suspension, washing water can be introduced and a filtrate can be drawn out; there are grooves (i.e., filter-pressing grooves) on the surface of the filter plates, and the protruding parts thereof are used to support filter cloth; the filter cloth acts as a sealing gasket; there are grips on both sides of the filter plate to support thefilter plate on beams; the filter plates are pressed by a pressing apparatus, a slurry pump presses the suspension into the filter chambers, forming filter residues on the filter cloth until the filter chambers are filled; and the filtrate passes through the filter cloth and flows along the grooves of the filter plates to the corner channel of the plates and frames and is discharged in a concentrated manner; after the filter-pressing is completed, introducing compressed air to remove the residual slurry in the filter-pressing grooves of the plate and frame filter press; then releasing the plate and frame filter press to remove mud cake generated by filter-pressing and starting the next working cycle; transporting the tail water subjected to the filter-pressing and dehydrating treatment back to the concentration tank; and mechanically transporting the mud cake generated by filter-pressing to a mud cake piling site, wherein in step 4, an air compressor implements the introduction of the compressed air to remove the residual slurry in the filter-pressing grooves, of the plate and frame filter press, and the water content of the mud cake generated by filter-pressing is not greater than 50%.
The beneficial effects of the present invention lie in: the filter aid used in the
river/lake sediment plate and frame filter-pressing and dehydrating method of the present
invention is an environmentally friendly filter aid sediment conditioner, which can (1)
increase drainage channels for river/lake sediment and reduce the damage of
conventional curing agents on sediment structure; (2) reduce the dosage of flocculants
and filter aids; (3) cause the pH values of both mud cake generated by filter-pressing and
water generated by filter-pressing to be lower than 9; (4) enable indicators such as COD,
BOD, TP of the water generated by filter-pressing to reach the five standards of surface
water; and (5) enable the mud cake generated by filter-pressing to reach the backfill
standard after simple disposal; furthermore, in the plate and frame filter-pressing and
dehydrating method of the present invention, after the filter-pressing is completed, an air
compressor is used to introduce compressed air to remove the residual slurry in the
filter-pressing grooves of the plate and frame filter press, which means that the air
compressor is added with a function of assisting the cleaning of thefilter-pressing
grooves in addition to an original function of providing pressure, thus the existing device
and energy are fully utilized, so that the method is an environmentally friendly river/lake
sediment plate and frame filter-pressing and dehydrating method.
Brief Description of the Drawings FIG. 1 is a process route diagram of the river/lake sediment plate and frame filter-pressing and dehydrating method of the present invention. Detailed Description of Embodiments The technical solution of the present invention will be further described below in conjunction with specific embodiments and drawings. The preparation method of the porous biopolymerization agent in the flocculant used in the embodiment of the present invention is as follows: 1. Compounding: uniformly mixing ingredients of agent A according to a formulation ratio; and uniformly mixing ingredients of the agent B according to a formulation ratio; 2. Ball milling: mixing the agent A and agent B, sending the mixture into a ball mill to prepare an irregular sphere of about 1-3mm, and keeping the pH value in the range of 5.0-6.0; 3. Crushing: crushing the above-mentioned irregular sphere into solid particles with a particle size of <20 mesh with a crusher; and 4. Packing: packing the above-mentioned solid particles into bags, ton bags or powder silos. The preparation method of the filter aid used in the embodiment of the present invention is as follows: 1. Screening: screening aluminum chloride, iron sulfate, sodium silicate, calcium silicate, bentonite and desulfuration gypsum, respectively, and controlling the screening mesh number to be below 10 mesh; 2. Mixing: uniformly stirring and mixing the screened aluminum chloride, iron sulfate, sodium silicate, calcium silicate, bentonite and desulfuration gypsum according to formulation ratio requirements to form a solid powder mixture; and keeping the mixture away from moisture; and 3. Packing: packing the above-mentioned solid powder mixture into bags, ton bags or powder silos. The area of a certain lake is about 300 square kilometers, the water area to be treated is about 0.5 square kilometers, the water content of the sediment is about 60%, the polluted sediment is silt clay, and the main pollutant is nitrogen and phosphorus, in which the nitrogen content is 4.4 mg/kg, and the phosphorus content is 1205 mg/kg; and the organic matter content in the polluted sediment of the lake is relatively high, with an average organic matter content being about 38.2mg/kg. According to the determination of the polluted sediment with the adsorption and desorption test and the inflection point method, etc., the average thickness of the polluted sediment in the lake is about 0.7 meters, thus a preliminary estimate is that the total amount of polluted sediment is about
550,000 tons, and as the project is based on a phased treatment concept, the total amount
of polluted sediment that needs to be dredged in this phase is about 105,000 tons. As
shown in FIG. 1, the specific steps of using the method of the present invention to carry
out plate and frame filter-pressing and dehydrating are as follows:
step 1: transporting, by using a high-concentration slurry pump, river/lake sediment
slurry to be treated to a sediment screening site through a pipeline and hence into a
deslagging system; the deslagging system intercepting solid impurities such as floating
debris, domestic garbage, weeds, relatively large blocks, garbage and particles;
stockpiling the solid impurities in a composite consolidation site for concentrated
treatment when piled up to a certain capacity; and the deslagged slurry entering a slurry
transport pipeline;
step 2: mixing 26 tons of polyacrylamide (PAM) and 26 tons of porous
biopolymerization agent according to a mass ratio of 1:1 and adding them to the slurry
transport pipeline by means of a pipeline mixer; uniformly mixing them with the
deslagged slurry in the slurry transport pipeline and transporting the mixture to a
concentration tank for static sedimentation to perform mud-water separation; detecting
the turbidity of a supernatant by a turbidity meter; and starting a pump to transport the
supernatant to a residual water treatment system if the turbidity of the supernatant is less
than 70, or otherwise continuing the static sedimentation until the turbidity of the
supernatant meets the requirements; and in the residual water treatment system, the
residual water will be further treated and discharged once discharge standards are
reached, wherein the porous biopolymerization agent contains 16.76 tons of agent A and
9.24 tons of agent B; and in agent A, the mass percentage content of cellulose is 25%, the mass percentage content of starch is 40%, and the mass percentage content of amino acid is 35%; and in agent B, the mass percentage content of glucoamylase is 65%, and the
mass percentage content of citric acid is 35%.
step 3: when the slurry in the concentration tank reaches a certain concentration, transporting the slurry to a mixing tank by using a high-concentration slurry pump; adding 2400 tons of filter aid to the mixing tank by means of a star-shaped unloader and a screw conveyor; and then fully mixing the slurry and the filter aid, wherein the filter aid contains 840 tons of sediment conditioner A, 960 tons of sediment conditioner B, and 600 tons of sediment conditioner C; and in sediment conditioner A, the mass percentage content of aluminum chloride is 90%, and the mass percentage content of iron sulfate is 10%; in sediment conditioner B, the mass percentage content of sodium silicate is 12%, and the mass percentage content of calcium silicate is 88%; and in sediment conditioner C, the mass percentage content of bentonite is 55%, and the mass percentage content of desulfuration gypsum is 45%; and
step 4: after the reaction is carried out in the mixing tank for a period of time, transporting, by using a feed pump, the slurry to a plate and frame filter press for filter-pressing and dehydrating treatment, wherein the plate and frame filter press consists of alternately arranged matching plates and diaphragm plates to form a set of filter chambers; there are through holes at the corners of the matching plates and diaphragm plates, which form complete channels after the assembly of the plates, so that a suspension, washing water can be introduced and a filtrate can be drawn out; there are grooves (i.e., filter-pressing grooves) on the surface of the filter plates, and the protruding parts thereof are used to support filter cloth; the filter cloth acts as a sealing gasket; there are grips on both sides of the filter plate to support the filter plate on beams; the filter plates are pressed by a pressing apparatus, a slurry pump presses the suspension into the filter chambers, forming filter residues on the filter cloth until the filter chambers are filled; and the filtrate passes through the filter cloth and flows along the grooves of the filter plates to the corner channel of the plates and frames and is discharged in a concentrated manner; after the filter-pressing is completed, an air compressor is used to introduce compressed air to remove the residual slurry in the filter-pressing grooves, of the plate and frame filter press; then releasing the plate and frame filter press to remove filter-pressed mud cake and starting the next working cycle; transporting the tail water subjected to the filter-pressing and dehydrating treatment back to the concentration tank; the water content of the mud cake generated by filter-pressing is less than 50% upon detection, transporting the mud cake to a mud cake piling site. The filter aid used in the river/lake sediment plate and frame filter-pressing and dehydrating method of the present invention is an environmentally friendly filter aid sediment conditioner, which can effectively accelerate mud-water separation without affecting the pH values of the mud and water, and greatly reduce the dosage of the sediment conditioner, and is low in cost; and the sediment subjected to mud-water separation can be used as backfill or greening planting soil to realize the resourcization and sustainable utilization of the river/lake sediment; furthermore, in the plate and frame filter-pressing and dehydrating method of the present invention, after the filter-pressing is completed, an air compressor is used to introduce compressed air to remove the residual slurry in the filter-pressing grooves the plate and frame filter press, which means that the air compressor provides a function of assisting the cleaning of thefilter-pressing grooves in addition to the original function of pressurizing, thus making full use of the existing device and energy, so that the method is an environmentally friendly river/lake sediment plate and frame filter-pressing and dehydrating method. It should be emphasized that the embodiment described in the present invention is illustrative rather than restrictive. Therefore, the present invention is not limited to the embodiment described in the specific implementations. Any other implementations obtained by a person skilled in the art from the technical solutions of the present invention also fall within the protection scope of the present invention.
Claims (8)
1. A river/lake sediment plate and frame filter-pressing and dehydrating method, comprising
the following steps:
step 1: transporting, by using a high-concentration slurry pump, river/lake sediment slurry to
be treated to a deslagging system through a pipeline; the deslagging system intercepting solid
impurities in the slurry; and the deslagged slurry entering a slurry transport pipeline;
step 2: adding a flocculant to the slurry transport pipeline by means of a pipeline mixer;
uniformly mixing the flocculant with the deslagged slurry in the slurry transport pipeline and
transporting the mixture to a concentration tank for static sedimentation to perform mud-water
separation; detecting the turbidity of a supernatant by a turbidity meter; and starting a pump to
transport the supernatant to a residual water treatment system if the turbidity of the supernatant
meets requirements, or otherwise continuing the static sedimentation until the turbidity of the
supernatant meets the requirements;
step 3: when the slurry in the concentration tank reaches a certain concentration, transporting
the slurry to a mixing tank by using a high-concentration slurry pump; adding a filter aid to the
mixing tank; and then fully mixing the slurry and the filter aid, wherein the filter aid contains a
sediment conditioner A, a sediment conditioner B, and a sediment conditioner C; the sediment
conditioner A contains aluminum chloride and iron sulfate; the sediment conditioner B contains
sodium silicate and calcium silicate; and the sediment conditioner C contains bentonite and
desulfuration gypsum; and
step 4: after the reaction is carried out in the mixing tank for a period of time, transporting, by
using a feed pump, the slurry to a plate and framefilter press for filter-pressing and dehydrating
treatment; after the filter-pressing is completed, introducing compressed air to remove the residual
slurry in filter-pressing grooves of the plate and frame filter press; then releasing the plate and
frame filter press to remove mud cake generated by filter-pressing and starting the next working
cycle; and transporting the tail water subjected to the filter-pressing and dehydrating treatment back
to the concentration tank;
wherein in step 2, the flocculant is a mixture of polyacrylamide and porous biopolymerization
agent, and the usage amount of the flocculant is 0.3%o-0.5%o of the mass of the treated sediment;
said porous biopolymerization agent is an irregular sphere made by uniformly mixing 50-70 wt% agent A and 30-50 wt% agent B, and the pH value of the irregular sphere is 5.0-6.0, in which the agent A is made by uniformly mixing 10-30 wt% cellulose, 20-50 wt% starch and 20-40 wt% amino acid, the sum of the percentages of each component in agent A is 100wt%: and the agent B is made by uniformly mixing 40-70 wt% glucoamylase and 30-60 wt% citric acid.
2. The river/lake sediment plate and frame filter-pressing and dehydrating method according to
claim 1, wherein the usage amount of the flocculant is 0.5%o of the mass of the treated sediment.
3. The river/lake sediment plate and frame filter-pressing and dehydrating method according to
claim 1, wherein the agent A is made by uniformly mixing 25 wt% cellulose, 40 wt% starch and 35
wt% amino acid; and the agent B is made by uniformly mixing 65 wt% glucoamylase and 35 wt%
citric acid; the particle size of the irregular sphere is 1-3 mm; and the irregular sphere is crushed
into solid particles with a particle size of < 20 mesh.
4. The river/lake sediment plate and frame filter-pressing and dehydrating method according to
claim 1, wherein in step 2, if the turbidity of the supernatant is less than 70, a pump is started to
transport the supernatant to a residual water treatment system, or otherwise the static sedimentation
is continued; and in the residual water treatment system, the residual water will be further treated
and discharged once discharge standards are reached;
5. The river/lake sediment plate and frame filter-pressing and dehydrating method according to
claim 1, wherein in step 3, in the filter aid, the content of the sediment conditioner A is 30-40 wt%,
the content of the sediment conditioner B is 35-50 wt%, and the content of the sediment conditioner
C is 20-30 wt%, with the content of aluminum chloride being 70-90 wt% and the content of iron
sulfate being 10-30 wt% in the sediment conditioner A, with the content of sodium silicate being
-30 wt%, and the content of calcium silicate being 70-90 wt% in the sediment conditioner B, with
the content of bentonite being 30-60 wt%, and with the content of desulfuration gypsum being
-70 wt% in the sediment conditioner C; and the aluminum chloride, iron sulfate, sodium silicate,
calcium silicate, bentonite and desulfuration gypsum are all solid powders with a particle size below
mesh; and the usage amount of the filter aid is 1%-5% of the mass of the treated sediment
6. The river/lake sediment plate and frame filter-pressing and dehydrating method according to
claim 5, wherein in the filter aid, the content of the sediment conditioner A is 35 wt%, and the
content of the sediment conditioner B is 40 wt%, and the content of the sediment conditioner C is
wt%, with the content of aluminum chloride being 90 wt% and the content of iron sulfate being
wt% in the sediment conditioner A, with the content of sodium silicate being 12 wt% and the
content of calcium silicate being 88 wt% in the sediment conditioner B, and with the content of
bentonite being 55 wt% and the content of desulfuration gypsum being 45 wt% in the sediment
conditioner C.
7. The river/lake sediment plate and frame filter-pressing and dehydrating method according to
claim 1, wherein in step 4, an air compressor implements the introduction of the compressed air to
remove the residual slurry in the filter-pressing grooves of the plate and frame filter press, and the
water content of the mud cake generated by filter-pressing is not greater than 50%.
8. The river/lake sediment plate and frame filter-pressing and dehydrating method according to
any of claim 1 to claim 7, wherein in step 1, the solid impurities intercepted in the deslagging
system are stockpiled in a composite consolidation site for concentrated treatment after being piled
up to a certain capacity; and the solid impurities include floating debris, domestic garbage and
weeds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911285683.9 | 2019-12-13 | ||
| CN201911285683.9A CN111018283B (en) | 2019-12-13 | 2019-12-13 | Plate-frame filter-pressing dehydration method for river and lake bottom mud |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2020286312A1 AU2020286312A1 (en) | 2021-07-01 |
| AU2020286312B2 true AU2020286312B2 (en) | 2021-10-14 |
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| AU2020286312A Active AU2020286312B2 (en) | 2019-12-13 | 2020-12-11 | River/lake sediment plate and frame filter-pressing and dehydrating method |
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| CN (1) | CN111018283B (en) |
| AU (1) | AU2020286312B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018282B (en) * | 2019-12-12 | 2020-11-24 | 中交（天津）生态环保设计研究院有限公司 | Porous biological polymerization agent for dewatering ecological dredging bottom mud of rivers and lakes |
| CN112047609A (en) * | 2020-09-10 | 2020-12-08 | 长江河湖建设有限公司 | Desilting sediment efficient dewatering and volume reduction system and process based on resource utilization |
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| CN113024073A (en) * | 2021-03-04 | 2021-06-25 | 中建水务环保有限公司 | Method for solidifying sludge based on plate-and-frame filter press |
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| CN111018283B (en) | 2020-12-01 |
| AU2020286312A1 (en) | 2021-07-01 |
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