CN111559849B - Urban river sludge treatment method - Google Patents
Urban river sludge treatment method Download PDFInfo
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- CN111559849B CN111559849B CN202010349920.XA CN202010349920A CN111559849B CN 111559849 B CN111559849 B CN 111559849B CN 202010349920 A CN202010349920 A CN 202010349920A CN 111559849 B CN111559849 B CN 111559849B
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- 239000010802 sludge Substances 0.000 title claims abstract description 176
- 238000000034 method Methods 0.000 title claims abstract description 67
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 98
- 239000002002 slurry Substances 0.000 claims abstract description 88
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 49
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 19
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 19
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 19
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 19
- LHIJANUOQQMGNT-UHFFFAOYSA-N aminoethylethanolamine Chemical compound NCCNCCO LHIJANUOQQMGNT-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 35
- 238000003756 stirring Methods 0.000 claims description 29
- 239000004814 polyurethane Substances 0.000 claims description 15
- 229920002635 polyurethane Polymers 0.000 claims description 15
- 239000004113 Sepiolite Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 11
- 229910052624 sepiolite Inorganic materials 0.000 claims description 11
- 235000019355 sepiolite Nutrition 0.000 claims description 11
- 239000004115 Sodium Silicate Substances 0.000 claims description 10
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 10
- 239000001506 calcium phosphate Substances 0.000 claims description 10
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 10
- 235000011010 calcium phosphates Nutrition 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 10
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 10
- 235000011152 sodium sulphate Nutrition 0.000 claims description 10
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 20
- 239000000706 filtrate Substances 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 9
- 239000002245 particle Substances 0.000 abstract description 9
- 238000002835 absorbance Methods 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000005416 organic matter Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 18
- 238000012360 testing method Methods 0.000 description 14
- 229910052976 metal sulfide Inorganic materials 0.000 description 8
- 244000005700 microbiome Species 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
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- 208000005156 Dehydration Diseases 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
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- 150000002500 ions Chemical group 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 241000700605 Viruses Species 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
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- 244000000010 microbial pathogen Species 0.000 description 2
- 210000004400 mucous membrane Anatomy 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 208000035404 Autolysis Diseases 0.000 description 1
- 206010057248 Cell death Diseases 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical group OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 241001052560 Thallis Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- -1 alkyl amine phosphate salt Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000034994 death Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000028043 self proteolysis Effects 0.000 description 1
- 230000003335 steric effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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
- C02F11/008—Sludge treatment by fixation or solidification
-
- 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
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for treating sludge in an urban river. The urban river sludge treatment method provided by the invention comprises the steps of firstly adding hydroxypropyl methyl cellulose to treat slurry, then adding phosphoric acid and potassium permanganate, then adding hydroxyethyl ethylenediamine, and finally adding a self-made curing agent to treat the slurry, thus obtaining the urban river sludge treatment method. The sludge treated by the urban river sludge treatment method provided by the invention has the advantages of low water content, high compressive strength, low organic matter content and heavy metal content, and meanwhile, the treatment method can also greatly reduce turbidity, absorbance, solid suspended matter content and particle size of sludge filtrate, effectively improve the water quality of the sludge filtrate, reduce environmental pollution and achieve the effect of environmental protection.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for treating sludge in an urban river.
Background
With the rapid development of society, the environmental pollution problem is increasingly serious, the municipal sewage treatment engineering is correspondingly developed, and the total amount of byproduct sludge in the sewage treatment process is rapidly increased. With the development of various enterprises in cities, the sludge in urban riverways has very complex components, contains abundant organic matters, N, P, K and other trace nutrient elements necessary for plant growth, and also contains refractory organic matters, heavy metals, pathogenic microorganisms, parasitic ova and the like. The sludge is deposited in urban river channels for a long time and is easy to cause more serious secondary pollution to the environment.
The traditional river channel dredging method is characterized in that sludge deposited at the river bottom is blown and stirred into a turbid water shape by mechanical equipment and flows away along with river water, so that the dredging function is achieved, and the cleaned sludge is solidified, dehydrated, stabilized, dried or incinerated. Patent document CN106565072A discloses a sludge treatment method, which comprises: s1, the sludge is sucked into the sludge suction device by the sludge suction device; s2, conveying the sludge in the sludge suction device to a treatment device through a pipeline; s3, screening out impurities in the sludge into sewage by using a vibrating screen of the treatment equipment; s4, the concentration device of the treatment equipment flocculates the sewage to change the sewage into sludge; s5, dehydrating the sludge by a dehydrating device of the treatment equipment to change the sludge into dry sludge. The sludge treatment method is characterized in that the sludge is directly salvaged out of the river channel through the sludge suction device, and the sludge is flocculated and dehydrated through the treatment equipment, so that the sludge is changed into dry sludge, the transportation is convenient, and the subsequent utilization is convenient.
Patent document CN105859068A discloses a sludge treatment process, which comprises the following steps: 1) removing impurities: filtering and removing garbage in the sludge by using a multi-stage grid; 2) pretreatment: pretreating sludge by using a third-stage sludge sedimentation tank to obtain sludge in the first, second and third-stage sludge sedimentation tanks, sludge slurry body and supernatant liquid after sedimentation in the third-stage sludge sedimentation tank; 3) curing treatment: respectively adopting mixing solidification and dehydration solidification methods to dehydrate and solidify the sludge and sludge slurry bodies in the first, second and third sludge sedimentation tanks to obtain sludge solidified soil A, B; 4) stacking and aging: and (4) transporting the sludge solidified soil A, B to a temporary storage yard, and aging for 3-7 days to finish the treatment. The sludge treatment process can simultaneously treat the sludge with larger particles, low water content and fine particles, and the sludge body with organic matters and high water content, and is particularly suitable for being applied to the river sludge with complex components, wide particle distribution and large water content difference.
However, the above method only performs physical dehydration treatment on the sludge in the urban river, so that heavy metals and a large amount of harmful microorganisms in the sludge are rather enriched in the treated dry sludge, which is not beneficial to subsequent resource recycling, and if the dry sludge is stacked for treatment, secondary pollution is also caused to the environment.
With the intensive research on the urban river sludge, more and more sludge treatment processes adopt chemical treatment agents for improving the resource utilization rate of the river sludge. Patent document CN104058568A discloses a method for treating sludge, comprising: (1) conveying the slurry sludge into a slurry collecting pool, filtering the slurry sludge flowing into the slurry collecting pool in the slurry collecting pool, cleaning the garbage with the diameter of more than 3mm out of the slurry collecting pool by a fur fishing machine, and fully stirring the filtered slurry sludge in the slurry collecting pool; (2) adding polymeric alumina and water, (3) adding polyacrylamide and water, (4) conveying the fully stirred slurry sludge obtained in the conditioning tank II into a filter press through a screw pump, and (5) draining the pressure filtered water after the filter press is dehydrated to form a sludge cake; (6) the cake is delivered by the conveyer belt. The treatment method has the advantages of good dehydration effect, high treatment efficiency and low treatment cost, and is favorable for large-scale popularization and utilization. However, the treatment method cannot meet the treatment requirement of urban river sludge with complex components.
Disclosure of Invention
The method aims to overcome the defects of the urban river sludge treatment process in the prior art. The invention aims to provide a method for treating sludge in an urban river channel, which aims to solve the defects.
The invention provides a method for treating sludge in an urban river, which comprises the following steps:
s1, collecting and placing sludge in the river into a stacking pool, removing impurities in the sludge, concentrating and stirring to obtain slurry;
s2, adding hydroxypropyl methyl cellulose into the slurry obtained in the step S1, and stirring for 25-35 min to obtain slurry I;
s3, uniformly spraying a phosphoric acid solution on the surface of the slurry I obtained in the step S2, then adding potassium permanganate, and standing for 20-30 min to obtain slurry II;
s4, adding hydroxyethyl ethylenediamine into the slurry II obtained in the step S3, uniformly stirring, and standing for 6-10 min to obtain slurry III;
s5, adding a curing agent into the slurry III obtained in the step S4, uniformly stirring, standing for 20-30 min, and dehydrating to obtain the cement mortar.
Further, the amount of the hydroxypropylmethylcellulose added in the step S2 is 2 to 4% by weight based on the total weight of the slurry.
Further, the liquid-solid ratio of the phosphoric acid solution to the slurry in the step S3 is 0.8ml:1 g.
Further, the concentration of the phosphoric acid solution in the step S3 is a phosphoric acid aqueous solution with a volume concentration of 20-30%.
Further, the solid-to-liquid ratio of the potassium permanganate to the phosphoric acid solution in the step S3 is 1g:6 ml.
Further, the addition amount of the hydroxyethylethylenediamine in the step S4 is 0.08-0.12% of the total volume of the phosphoric acid solution.
Furthermore, the addition amount of the curing agent in the step S5 is 3-6% of the total weight of the slurry.
Further, the curing agent in the step S5 is composed of the following components in parts by weight:
25-35 parts of diatomite, 18-24 parts of sepiolite, 12-16 parts of hyperbranched polyurethane oligomer, 6-10 parts of polyaluminum sulfate, 10-16 parts of sodium silicate, 6-10 parts of sodium sulfate and 5-10 parts of calcium phosphate.
Further, the curing agent in the step S5 is composed of the following components in parts by weight:
25 parts of diatomite, 22 parts of sepiolite, 14 parts of hyperbranched polyurethane oligomer, 8 parts of polyaluminium sulfate, 12 parts of sodium silicate, 8 parts of sodium sulfate and 6 parts of calcium phosphate.
At present, the urban river sludge is mostly dewatered by adopting physical equipment or chemical curing agents or flocculating agents. However, with the intensive research on the urban river sludge, the urban river sludge is found to have very complex components, not only has high water content, but also contains a large amount of refractory organic matters, heavy metals, pathogenic microorganisms, parasitic ova and the like, and the analysis on the chemical forms of the heavy metals in the urban river sludge shows that more than 70% of the heavy metals in the urban river sludge exist in the form of insoluble sulfides, so that the metal sulfides in the sludge cannot be removed by ordinary chemical adsorption. Therefore, the current sludge treatment process cannot meet the treatment requirements of urban river sludge.
In order to solve the problems, the inventor provides a method for treating sludge of an urban river, which can solve the defects through a large number of experimental researches and researches, and comprises the steps of firstly adding hydroxypropyl methyl cellulose to treat slurry, pasting and aggregating metal sulfides in the sludge, then adding phosphoric acid and potassium permanganate to convert the aggregated metal sulfides into ion forms to be dissolved out, then adding hydroxyethyl ethylenediamine to react with the phosphoric acid in the sludge to generate alcohol amine phosphate substances for removing harmful microorganisms such as bacteria and viruses in the sludge, and finally adding a self-made curing agent to treat the sludge. The sludge treated by the urban river sludge treatment method provided by the invention has the advantages of low water content, high compressive strength, low organic matter content and heavy metal content, and meanwhile, the treatment method can also greatly reduce turbidity, absorbance, solid suspended matter content and particle size of sludge filtrate, effectively improve the water quality of the sludge filtrate, reduce environmental pollution and achieve the effect of environmental protection.
The urban river sludge treatment method provided by the invention is characterized in that firstly, hydroxypropyl methyl cellulose is added to stir the sludge, the hydroxypropyl methyl cellulose can fully stick metal sulfides in the sludge in the stirring process, and the hydroxypropyl methyl cellulose forms a layer of mucous membrane fully sticking the metal sulfides on the surface of the sludge after standing, so that the effect of gathering the metal sulfides is achieved. Then, phosphoric acid and potassium permanganate with specific concentrations are added, and under the action of potassium permanganate, the phosphoric acid can quickly convert metal sulfides gathered on the surface of the hydroxypropyl methyl cellulose mucous membrane into ionic soluble heavy metal, so that insoluble heavy metal compounds can be conveniently removed, and the removal rate of the heavy metal in the sludge of the urban river channel is improved. Meanwhile, the added potassium permanganate can degrade macromolecular organic matters such as a large amount of polycyclic aromatic hydrocarbon organic matters, a large amount of benzene rings, azo organic matters and the like in the urban river sludge, and can effectively reduce the content of the organic matters in the urban river sludge.
In addition, the method aims to overcome the defect that a large amount of water and lime are needed to wash or neutralize the sludge after the heavy metals are removed by an acidification method at present. In the invention, hydroxyethyl ethylenediamine and phosphoric acid are added for reaction, and the generated alcohol amine phosphate substance is alkyl amine phosphate salt, wherein P-O-H is combined with ammonia molecules by coordination bonds to generate P-O-NH4In which NH is positively charged4(+)Can adsorb harmful microorganisms such as bacteria and viruses with negative electricity, destroy cell membrane of harmful microorganisms such as bacteria and viruses, and finally cause autolysis death of harmful microorganism thallus and NH with positive charge4(+)And the hydrogen bonds of the proteins can be destroyed, so that the mycoprotein is denatured and precipitated, and the effect of removing harmful microorganisms in the sludge of the urban river is achieved. In addition, the invention firstly adopts the hydroxypropyl methyl cellulose to aggregate the metal sulfide in the slurry, and can also greatly reduce the dosage of the phosphoric acid to achieve the same effect.
Furthermore, the self-made curing agent is added in the urban river sludge treatment method provided by the invention, so that the compressive strength and hardness of the urban river sludge can be improved, and the water content and heavy metal content of the sludge can be reduced. The inventor finds that the diatomite and the sepiolite are compounded according to a certain proportion to absorb the water content, the degraded organic matters and the autolyzed thalli of the urban river sludge, the polyaluminium sulfate in the curing agent is a compound high polymer, has a huge molecular structure and strong adsorption capacity, has better adsorption and flocculation effects on acidified slurry, and can completely remove the water content and harmful components of the urban river sludge by compounding the diatomite, the sepiolite and the polyaluminium sulfate. In addition, hyperbranched polyurethane oligomer molecules in the curing agent are in an ellipsoidal shape and are not tangled, a plurality of pores are formed, and the hyperbranched polyurethane oligomer molecules can quickly adsorb free heavy metal ions in the sludge, ester groups and amide groups in the structure of the hyperbranched polyurethane oligomer have strong electron donating capacity and can be matched with the metal ions adsorbed in the pores, so that the adsorbed heavy metal ions can be prevented from dissociating into the sludge again, and the removal rate of the heavy metal ions in the sludge of the urban river channel is effectively improved.
Further, the inventors have surprisingly found that the hyperbranched polyurethane oligomer provided by the invention can also improve the strength of urban river sludge. The hyperbranched polyurethane oligomer provided by the invention can play a role in enhancing the strength of sludge in a curing agent system through a certain charge repulsion principle or a high molecular steric effect. In addition, the sodium silicate, the sodium sulfate and the calcium phosphate in the curing agent change the material structure in the soil, improve the property of the soil, enable the soil to be easily cured and increase the water resistance of the sludge.
Compared with the prior art, the urban river sludge treatment method provided by the invention has the following advantages:
(1) the method for treating the sludge of the urban river channel has the advantages of good dewatering effect, capability of effectively removing harmful microorganisms in the sludge and reducing the content of heavy metal, and capability of meeting the treatment requirement of the sludge of the urban river channel;
(2) the method for treating the sludge of the urban river channel can also improve the compressive strength of the sludge of the urban river channel, has low content of harmful components, can be recycled, does not need to be treated again, and saves the cost;
(3) the urban river sludge treatment method provided by the invention can also improve the water quality of sludge filtrate and reduce the environmental pollution, is an environment-friendly and pollution-free urban river sludge treatment method, and is beneficial to large-scale popularization and application.
The specific implementation mode is as follows:
the present invention is further described in the following description of the specific embodiments, which is not intended to limit the invention, but various modifications and improvements can be made by those skilled in the art according to the basic idea of the invention, within the scope of the invention, as long as they do not depart from the basic idea of the invention.
Embodiment 1, a method for treating sludge in urban river
S1, collecting and placing sludge in the river into a stacking pool, removing impurities in the sludge, concentrating and stirring to obtain slurry;
s2, adding hydroxypropyl methyl cellulose into the slurry obtained in the step S1, wherein the addition amount of the hydroxypropyl methyl cellulose is 2% of the total weight of the slurry, and stirring for 35min to obtain slurry I;
s3, uniformly spraying a phosphoric acid solution on the surface of the slurry I obtained in the step S2, wherein the liquid-solid ratio of the phosphoric acid solution to the slurry is 0.8ml:1g, the concentration of the phosphoric acid solution is a phosphoric acid water solution with the volume concentration of 20%, then adding potassium permanganate, the solid-liquid ratio of the potassium permanganate to the phosphoric acid solution is 1g:6ml, and standing for 30min to obtain slurry II;
s4, adding hydroxyethyl ethylenediamine into the slurry II obtained in the step S3, wherein the addition amount of the hydroxyethyl ethylenediamine is 0.08 percent of the total volume of the phosphoric acid solution, uniformly stirring, and standing for 10min to obtain slurry III;
s5, adding a curing agent into the slurry III obtained in the step S4, wherein the addition amount of the curing agent is 6% of the total weight of the slurry, uniformly stirring, and the curing agent consists of 25 parts of diatomite, 18 parts of sepiolite, 12 parts of hyperbranched polyurethane oligomer, 6 parts of polyaluminum sulfate, 10 parts of sodium silicate, 6 parts of sodium sulfate and 5 parts of calcium phosphate, standing for 30min, and dehydrating to obtain the modified epoxy resin.
Embodiment 2, urban river sludge treatment method
S1, collecting and placing sludge in the river into a stacking pool, removing impurities in the sludge, concentrating and stirring to obtain slurry;
s2, adding hydroxypropyl methyl cellulose into the slurry obtained in the step S1, wherein the addition amount of the hydroxypropyl methyl cellulose is 3 percent of the total weight of the slurry, and stirring for 30min to obtain slurry I;
s3, uniformly spraying a phosphoric acid solution on the surface of the slurry I obtained in the step S2, wherein the liquid-solid ratio of the phosphoric acid solution to the slurry is 0.8ml:1g, the concentration of the phosphoric acid solution is 30% of phosphoric acid aqueous solution by volume concentration, then adding potassium permanganate, the solid-liquid ratio of the potassium permanganate to the phosphoric acid solution is 1g:6ml, and standing for 25min to obtain slurry II;
s4, adding hydroxyethyl ethylenediamine into the slurry II obtained in the step S3, wherein the addition amount of the hydroxyethyl ethylenediamine is 0.10% of the total volume of the phosphoric acid solution, uniformly stirring, and standing for 8min to obtain slurry III;
s5, adding a curing agent into the slurry III obtained in the step S4, wherein the addition amount of the curing agent is 4% of the total weight of the slurry, uniformly stirring, and the curing agent consists of 25 parts of diatomite, 22 parts of sepiolite, 14 parts of hyperbranched polyurethane oligomer, 8 parts of polyaluminum sulfate, 12 parts of sodium silicate, 8 parts of sodium sulfate and 6 parts of calcium phosphate, standing for 25min, and dehydrating to obtain the modified epoxy resin.
Embodiment 3. urban river sludge treatment method
S1, collecting and placing sludge in the river into a stacking pool, removing impurities in the sludge, concentrating and stirring to obtain slurry;
s2, adding hydroxypropyl methyl cellulose into the slurry obtained in the step S1, wherein the addition amount of the hydroxypropyl methyl cellulose is 4% of the total weight of the slurry, and stirring for 25min to obtain slurry I;
s3, uniformly spraying a phosphoric acid solution on the surface of the slurry I obtained in the step S2, wherein the liquid-solid ratio of the phosphoric acid solution to the slurry is 0.8ml:1g, the concentration volume concentration of the phosphoric acid solution is 30% of phosphoric acid aqueous solution, then adding potassium permanganate, the solid-liquid ratio of the potassium permanganate to the phosphoric acid solution is 1g:6ml, and standing for 20min to obtain slurry II;
s4, adding hydroxyethyl ethylenediamine into the slurry II obtained in the step S3, wherein the addition amount of the hydroxyethyl ethylenediamine is 0.12 percent of the total volume of the phosphoric acid solution, uniformly stirring, and standing for 6min to obtain slurry III;
s5, adding a curing agent into the slurry III obtained in the step S4, wherein the addition amount of the curing agent is 3% of the total weight of the slurry, uniformly stirring, and the curing agent consists of 35 parts of diatomite, 24 parts of sepiolite, 16 parts of hyperbranched polyurethane oligomer, 10 parts of polyaluminum sulfate, 16 parts of sodium silicate, 10 parts of sodium sulfate and 10 parts of calcium phosphate, standing for 20min, and dehydrating to obtain the modified epoxy resin.
Comparative example 1 urban river sludge treatment method
S1, collecting and placing sludge in the river into a stacking pool, removing impurities in the sludge, concentrating and stirring to obtain slurry;
s2, uniformly spraying a phosphoric acid solution on the surface of the slurry obtained in the step S1, wherein the liquid-solid ratio of the phosphoric acid solution to the slurry is 0.8ml:1g, the concentration of the phosphoric acid solution is 30% of phosphoric acid aqueous solution by volume concentration, then adding potassium permanganate, the solid-liquid ratio of the potassium permanganate to the phosphoric acid solution is 1g:6ml, and standing for 25min to obtain slurry I;
s3, adding hydroxyethyl ethylenediamine into the slurry I obtained in the step S2, wherein the addition amount of the hydroxyethyl ethylenediamine is 0.10% of the total volume of the phosphoric acid solution, uniformly stirring, and standing for 8min to obtain slurry II;
s4, adding a curing agent into the slurry II obtained in the step S3, wherein the addition amount of the curing agent is 4% of the total weight of the slurry, uniformly stirring, and the curing agent consists of 25 parts of diatomite, 22 parts of sepiolite, 14 parts of hyperbranched polyurethane oligomer, 8 parts of polyaluminum sulfate, 12 parts of sodium silicate, 8 parts of sodium sulfate and 6 parts of calcium phosphate, standing for 25min, and dehydrating to obtain the modified epoxy resin.
The difference from example 2 is that: hydroxypropyl methylcellulose was not added.
Comparative example 2, urban river sludge treatment method
The difference from example 2 is that: the phosphoric acid in step S3 was replaced with hydrochloric acid having a concentration of 10% by volume aqueous hydrochloric acid, and the remaining steps were similar to those in example 2.
Comparative example 3, urban river sludge treatment method
S1, collecting and placing sludge in the river into a stacking pool, removing impurities in the sludge, concentrating and stirring to obtain slurry;
s2, adding hydroxypropyl methyl cellulose into the slurry obtained in the step S1, wherein the addition amount of the hydroxypropyl methyl cellulose is 3 percent of the total weight of the slurry, and stirring for 30min to obtain slurry I;
s3, uniformly spraying a phosphoric acid solution on the surface of the slurry I obtained in the step S2, wherein the liquid-solid ratio of the phosphoric acid solution to the slurry is 0.8ml:1g, the concentration volume concentration of the phosphoric acid solution is 30% of phosphoric acid aqueous solution, then adding potassium permanganate, the solid-liquid ratio of the potassium permanganate to the phosphoric acid solution is 1g:6ml, and standing for 25min to obtain slurry II;
s4, adding a curing agent into the slurry II obtained in the step S3, wherein the addition amount of the curing agent is 4% of the total weight of the slurry, uniformly stirring, and the curing agent consists of 25 parts of diatomite, 22 parts of sepiolite, 14 parts of hyperbranched polyurethane oligomer, 8 parts of polyaluminum sulfate, 12 parts of sodium silicate, 8 parts of sodium sulfate and 6 parts of calcium phosphate, standing for 25min, and dehydrating to obtain the modified epoxy resin.
The difference from example 2 is that: no hydroxyethylethylenediamine was added.
Comparative example 4, urban river sludge treatment method
The difference from example 2 is that: the hyperbranched polyurethane oligomer in the curing agent in the step S5 was replaced with ethylenediamine tetraacetic acid, and the rest of the procedure was similar to that of example 2.
Test example I, Performance measurement test of treated urban river sludge
1. The test method comprises the following steps:
river silt with serious pollution in Guangzhou city is taken as a detection sample, the urban river silt processing method provided by the embodiment 1, the embodiment 2, the embodiment 3, the comparative example 1, the comparative example 2, the comparative example 3 and the comparative example 4 is adopted for processing, and the water content and the compressive strength of the processed silt are measured.
(1) And (3) measuring the water content: the sludge treated by the urban river sludge treatment methods provided by the examples 1, 2, 3, 1, 2, 3 and 4 is placed in a culture dish padded with filter paper and weighed, and is dried in an oven at a constant temperature of 105 ℃ to a constant weight, and then is taken out and cooled and weighed, and the water content of the solidified sludge is calculated. Wherein, the calculation formula of the water content of the solidified sludge is as follows: a ═ W1+W2-W3)/(W2-W4) X 100%, and a-the water content of the solidified sludge is percent; w1-petri dish mass, g; w2-mass of solidified sludge and filter paper, g; w3Mass of solidified sludge, filter paper and petri dish after drying at-105 ℃, g; w4Mass of filter paper, g.
(2) Determination of compressive strength: the compressive strength of the sludge treated by the municipal river sludge treatment methods provided in examples 1, 2, 3, 1, 2, 3 and 4 was measured with reference to the measurement method specified in CJ/T3073-1998.
2. Test results
The test results are shown in table 1.
Table 1 test for determining the properties of treated municipal river sludge
As can be seen from Table 1, the water content of the sludge treated by the urban river sludge treatment method provided by the embodiments 1-3 of the invention is less than 18%, and the compressive strength is greater than 5 MPa. And the water content of the sludge treated by the urban river sludge treatment method provided by the comparative examples 1-4 is increased, and the compressive strength is reduced. The method for treating the sludge in the urban river provided by the invention has good dehydration effect, and can enhance the compressive strength of the treated sludge, thereby being beneficial to subsequent resource treatment.
Test example II, heavy metal content determination test of treated urban river sludge
1. The test method comprises the following steps:
river silt with serious pollution in Guangzhou city is taken as a detection sample, the mercury, arsenic, chromium, copper, lead, cadmium, zinc and nickel contents in the silt treated by the urban river silt treatment methods provided in examples 1, 2 and 3, comparative examples 1, 2 and 4 are detected according to the regulations of national soil environmental quality Standard (GB15618-1995), and the untreated detection sample is taken as a control group.
2. And (3) test results:
the test results are shown in table 2.
Table 2 heavy metal content determination test of treated urban river sludge
As can be seen from table 2, the heavy metal content of the sludge treated by the method for treating sludge in urban river channels provided in embodiments 1 to 3 of the present invention meets the regulation (class III) of the national "soil environmental quality standard" (GB15618-1995), which indicates that the method for treating sludge in urban river channels provided by the present invention can effectively improve the removal rate of the heavy metal content of the sludge in urban river channels, and is more favorable for the subsequent resource treatment of the sludge.
Test example three, filtrate determination test of treated urban river sludge
1. The test method comprises the following steps:
river silt with serious pollution in Guangzhou city is taken as a detection sample, the urban river silt processing method provided by the example 1, the example 2, the example 3, the comparative example 1, the comparative example 2, the comparative example 3 and the comparative example 4 is adopted for processing, the processed silt filtrate is measured, and the turbidity, the absorbance, the content of solid suspended matters, the particle size and the COD value of the filtrate are measured. Wherein the turbidity of the filtrate is measured by using an WGZ-3 turbidity meter; measuring the absorbance of the filtrate by using a 723G spectrophotometer; the content of the solid suspended matters in the filtrate is determined by referring to a determination method of GB 11901-89; measuring the particle size of the filtrate by using a particle size counter; COD value determination was determined with reference to HJ/T399-2007.
2. And (3) test results:
the test results are shown in table 3.
TABLE 3 determination of the filtrate of the treated municipal river sludge
| Turbidity (NTU) | Absorbance (A) | Content of solid suspended matter (mg/L) | Particle size (nm) | COD(mg/L) | |
| Example 1 | 3.86 | 0.008 | 4.8 | 4157.4 | 12 |
| Example 2 | 3.04 | 0.007 | 3.9 | 4005.4 | 10 |
| Example 3 | 3.98 | 0.008 | 5.0 | 4200.8 | 14 |
| Comparative example 1 | 7.45 | 0.026 | 6.5 | 4989.4 | 23 |
| Comparative example 2 | 7.06 | 0.038 | 6.2 | 4653.8 | 65 |
| Comparative example 3 | 6.88 | 0.030 | 5.9 | 4387.5 | 58 |
| Comparative example 4 | 5.24 | 0.023 | 5.8 | 4215.7 | 35 |
As can be seen from table 3, the sludge filtrate treated by the method for treating sludge in urban riverways provided in embodiments 1 to 3 of the present invention can greatly reduce turbidity, absorbance, suspended solid content and filtrate particle size of the sludge filtrate, and the treated filtrate has a low COD value, and the treated water can be recycled. The urban river sludge treatment method provided by the invention can effectively improve the water quality of sludge filtrate and reduce environmental pollution, is a low-cost and environment-friendly urban river sludge treatment method, and is beneficial to large-scale popularization and application.
Claims (9)
1. The method for treating the sludge in the urban river channel is characterized by comprising the following steps of:
s1, collecting and placing sludge in the river into a stacking pool, removing impurities in the sludge, concentrating and stirring to obtain slurry;
s2, adding hydroxypropyl methyl cellulose into the slurry obtained in the step S1, and stirring for 25-35 min to obtain slurry I;
s3, uniformly spraying a phosphoric acid solution on the surface of the slurry I obtained in the step S2, then adding potassium permanganate, and standing for 20-30 min to obtain slurry II;
s4, adding hydroxyethyl ethylenediamine into the slurry II obtained in the step S3, uniformly stirring, and standing for 6-10 min to obtain slurry III;
s5, adding a curing agent into the slurry III obtained in the step S4, uniformly stirring, standing for 20-30 min, and dehydrating to obtain the cement mortar.
2. The method for treating sludge in an urban river channel according to claim 1, wherein the amount of hydroxypropyl methylcellulose added in step S2 is 2-4% by weight of the total slurry.
3. The method for treating sludge in an urban river according to claim 1, wherein the liquid-solid ratio of the phosphoric acid solution to the slurry in step S3 is 0.8ml:1 g.
4. The method for treating sludge in an urban river according to claim 1, wherein the concentration of the phosphoric acid solution in step S3 is 20-30% by volume of phosphoric acid aqueous solution.
5. The method for treating sludge in an urban river according to claim 1, wherein the solid-to-liquid ratio of potassium permanganate to phosphoric acid solution in step S3 is 1g:6 ml.
6. The method for treating sludge in an urban river according to claim 1, wherein the amount of hydroxyethylethylenediamine added in step S4 is 0.08 to 0.12% of the total volume of the phosphoric acid solution.
7. The method for treating sludge in an urban river according to claim 1, wherein the curing agent is added in an amount of 3 to 6% by weight based on the total weight of the slurry in step S5.
8. The method for treating sludge in an urban river according to claim 1, wherein the curing agent in step S5 comprises the following components in parts by weight:
25-35 parts of diatomite, 18-24 parts of sepiolite, 12-16 parts of hyperbranched polyurethane oligomer, 6-10 parts of polyaluminum sulfate, 10-16 parts of sodium silicate, 6-10 parts of sodium sulfate and 5-10 parts of calcium phosphate.
9. The method for treating sludge in an urban river according to claim 8, wherein the curing agent in step S5 comprises the following components in parts by weight:
25 parts of diatomite, 22 parts of sepiolite, 14 parts of hyperbranched polyurethane oligomer, 8 parts of polyaluminium sulfate, 12 parts of sodium silicate, 8 parts of sodium sulfate and 6 parts of calcium phosphate.
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| JP2004511345A (en) * | 2000-10-17 | 2004-04-15 | ソルヴェイ | How to deactivate sludge |
| JP2013226514A (en) * | 2012-04-26 | 2013-11-07 | Lion Corp | Method for treating dewatered sludge |
| CN108191181A (en) * | 2018-01-12 | 2018-06-22 | 广州市水电建设工程有限公司 | A kind of urban river sediment cleanser and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004511345A (en) * | 2000-10-17 | 2004-04-15 | ソルヴェイ | How to deactivate sludge |
| JP2013226514A (en) * | 2012-04-26 | 2013-11-07 | Lion Corp | Method for treating dewatered sludge |
| CN108191181A (en) * | 2018-01-12 | 2018-06-22 | 广州市水电建设工程有限公司 | A kind of urban river sediment cleanser and its production method |
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