CN110590121A - Sludge dehydrating agent and sludge dehydrating method - Google Patents
Sludge dehydrating agent and sludge dehydrating method Download PDFInfo
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- CN110590121A CN110590121A CN201910815187.3A CN201910815187A CN110590121A CN 110590121 A CN110590121 A CN 110590121A CN 201910815187 A CN201910815187 A CN 201910815187A CN 110590121 A CN110590121 A CN 110590121A
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- 239000010802 sludge Substances 0.000 title claims abstract description 183
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012024 dehydrating agents Substances 0.000 title claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 17
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical class [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 13
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 239000004343 Calcium peroxide Substances 0.000 claims description 6
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 6
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 claims description 6
- 235000019402 calcium peroxide Nutrition 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 229940044631 ferric chloride hexahydrate Drugs 0.000 claims description 3
- NQXWGWZJXJUMQB-UHFFFAOYSA-K iron trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].Cl[Fe+]Cl NQXWGWZJXJUMQB-UHFFFAOYSA-K 0.000 claims description 3
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 abstract description 23
- 238000006297 dehydration reaction Methods 0.000 abstract description 23
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 208000005156 Dehydration Diseases 0.000 description 22
- 230000000694 effects Effects 0.000 description 13
- 239000000126 substance Substances 0.000 description 12
- 230000003750 conditioning effect Effects 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000010865 sewage Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 230000001143 conditioned effect Effects 0.000 description 4
- 230000003203 everyday effect Effects 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 238000009264 composting Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229940032296 ferric chloride Drugs 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 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
- C02F11/121—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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a sludge dehydrating agent and a sludge dehydrating method, belonging to the field of sludge treatment and disposal and the technical field of environmental management. The sludge dehydrating agent comprises an agent A and an agent B, wherein the agent A is a removal assisting agent, and the agent B comprises calcium salt and oxide. The sludge dehydrating agent disclosed by the invention is used for dehydrating sludge, so that the specific resistance value of the sludge is in a range suitable for mechanical dehydration, the water content of the sludge is reduced to be below 20%, the volume of the sludge is reduced, and a foundation is laid for final treatment and application of the sludge.
Description
Technical Field
The invention relates to a sludge dehydrating agent and a sludge dehydrating method, belonging to the field of sludge treatment and disposal and the technical field of environmental management.
Background
The global social economy is rapidly developed, the living standard of people is gradually improved, and the environmental problems are gradually increased. Among them, the problems of sewage and sludge become more serious, the discharge and treatment amount of sewage gradually increases, and the corresponding sludge production amount also increases. Therefore, how to effectively treat the municipal sludge and realize harmlessness, reclamation and high value of the sludge becomes an urgent problem which must be solved in China.
At present, domestic urban sewage treatment enterprises have insufficient treatment capacity, and a large amount of sludge cannot be subjected to standardized treatment after the treatment means, so that secondary pollution is directly caused, and the ecological environment is seriously harmed. Landfill technology, incineration technology and composting technology are common municipal sludge treatment and disposal technologies at present, and land landfill is the main disposal mode of sludge in China at the present stage and accounts for 66% of the total sludge treatment amount. In order to effectively treat the sludge, the country sets strict requirements on the water content of various sludge treatment modes, for example, the water content of the sludge is required to be lower than 60% when land is buried, the water content of dewatered sludge of a municipal sewage treatment plant is required to be lower than 80%, and the water content of the sludge for aerobic composting is required to be lower than 65%. The water content of untreated sludge in a sewage treatment plant is up to more than 99%, the water content of the concentrated sludge can be reduced to 94-97%, the water content of the sludge subjected to conventional medicament conditioning and mechanical dehydration treatment can be reduced to 70-80%, and obviously, the water content of the sludge does not meet the requirements of recycling and disposal. It can be seen that the high water content of the sludge is a key factor limiting the sludge disposal. In addition, the high water content is accompanied by the problems of large volume of the sludge, high transportation cost, large occupied treatment field and the like. The cost of sludge treatment mainly comprises transportation cost and final disposal cost, the key factor influencing the cost is the amount of sludge, and the reduction of the water content of the sludge can greatly reduce the disposal cost. Therefore, the improvement of the sludge dewatering efficiency and the reduction of the water content of the sludge become difficult problems to be solved urgently in the technical field of sewage treatment and environmental science.
Sludge dewatering performance is affected by a number of factors, including: sludge moisture existing form, size and distribution of sludge particles, surface charge, extracellular polymeric substances and the like. The sludge Extracellular Polymeric Substance (EPS) forms a sludge organic floc structure, so that the hydrophilicity is high, the wrapping capacity is strong, and the release of bound water in the treatment process of the sludge is hindered. In addition, the sludge floc has high organic matter content and high compressibility, and can block the pores of a filter cake in the later stage of filtration, so that the mechanical dehydration efficiency is low; and the sludge flocs stably suspend in water in a colloidal form and are difficult to agglomerate and settle. Therefore, in order to improve the sludge dewatering efficiency, a series of pretreatment measures are needed to condition the sludge, such as destroying extracellular polymers of the sludge and changing the surface characteristics of the sludge; the particle size of the sludge particles is increased, and the sludge particles are promoted to destabilize, aggregate and settle.
The dehydration degree of the sludge treated by the physical method can be improved to the maximum degree, the water content is generally below 50 percent, but the physical pretreatment method has complex process, difficult operation, large energy consumption in reaction and higher cost. The dehydration rate of the biological method can be reduced to about 70 percent, but the overall development is limited due to factors such as difficult microorganism selection, complex culture process, longer culture period and the like. The chemical conditioning method is a method for improving the sludge dewatering performance by changing the properties of the sludge by using a chemical conditioning agent. The chemical method is the most widely applied method at present due to simple operation and stable effect. At present, the mature sludge deep dehydration technology mainly comprises physical and chemical methods such as acid treatment, advanced oxidation technology, heat treatment and the like, and biodegradation methods such as bioleaching, enzyme treatment and the like. The sludge is treated by combining physical, chemical and biological methods, the dehydration effect of the sludge is improved by synergistic effect, or the optimal conditions of the sludge in all aspects such as dehydration performance, economical efficiency and the like are achieved by adding conventional methods such as conditioning agent adjustment and the like. The conventional sludge conditioning is that inorganic conditioning agents are added to change some basic characteristics of the sludge, and CaO and FeCl are added3And the flocculant or coagulant aggravates the loose structure of the sludge to form a hard network framework and relieves the hydrophilic phenomenon so as to achieve the effect of improving the sludge dewatering performance. Meanwhile, when the influence of the oxidant on the sludge dewatering performance is compared, the effect that the performance of improving the sludge dewatering by the hydrogen peroxide is optimal, no by-product is generated, the air flotation separation of solid particles in the sludge can be promoted, and the conditioning effect is good. However, it has been found that the addition of conventional chemical conditioners does not improve the dewaterability of the sludge, but only improves the dewatering rate and filtration performance of the sludge. The four forms of water in the sludge particles are interstitial water, capillary water, surface adsorption water and cell binding water, enough time is given, no matter whether similar conditioner is added or not, only the removable free water is removed, the bound water wrapped by EPS can not be removed, a large amount of water is locked in the sludge particles and can not be released, and the water content of the final product sludge isCan not be changed, and can not achieve the purpose of deep dehydration.
The patent with publication number CN107032580A discloses a sludge dewatering agent, which is prepared by respectively using diatomite, polyferric sulfate, Polyacrylamide (PAM), calcium peroxide, sodium peroxide and the like as a filter aid, a flocculating agent and peroxide, heating concentrated sludge to 40-50 ℃, adding the peroxide, then adding the flocculating agent and the filter aid, and mechanically filter-pressing the treated sludge to reduce the water content to below 70%. The method has the advantages of complicated and various medicament adding procedures, high water content and incapability of meeting the deep dehydration requirement.
The patent with publication number CN105753296A discloses a bio-based excess sludge deep dehydration conditioner, which takes agricultural waste bamboo powder as the dehydration conditioner, and utilizes the action of a skeleton construction body thereof to form coarse and compact sludge flocs, reduce the specific resistance of the sludge and enhance the dehydration effect of the sludge; bamboo powder is used for replacing ferric chloride and calcium oxide, and the bamboo powder and polyacrylamide are used as sludge conditioners for jointly treating sludge, so that the water content of sludge cakes is reduced to 58.74%. However, the dosage of the agent is large, and the agent contains ferric chloride and corrodes a steel structure.
Patent publication No. CN103880259A discloses a method of using calcium peroxide to promote hydrolysis of sludge and improve the anaerobic digestion effect of sludge. In order to reduce the cost of sludge hydrolysis, the sludge is concentrated and then enters a calcium peroxide treatment device and then flows into an anaerobic digestion tank. Wherein the mass ratio of the calcium peroxide to the sludge is 0.01: 1-0.6: 1. The method does not relate to the improvement of sludge dewatering performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the sludge dehydrating agent and the sludge dehydrating method.
In order to achieve the purpose, the invention adopts the technical scheme that: the sludge dehydrating agent comprises an agent A and an agent B, wherein the agent A is a removal assisting agent, and the agent B comprises calcium salt and oxide.
As a preferred embodiment of the sludge dewatering agent, in each liter of sludge, the dosage of the removal-assisting agent in the agent A is 3.2-9.3 g, the dosage of the calcium salt in the agent B is 0.1-4.8 g, and the dosage of the oxide in the agent B is 0.4-4.9 g.
The component contents in the agent A and the agent B can be correspondingly adjusted according to sludge with different properties. Calcium salt and oxide in the agent B destroy the colloid structure of the sludge by changing the physicochemical properties and components of the surface of the sludge particles, reduce the affinity with water, and improve the porosity among the particles, thereby improving the dehydration performance.
As a preferred embodiment of the sludge-dewatering agent of the present invention, the removal-assisting agent is ferric chloride hexahydrate (FeCl)3 6H2O), aluminum chloride (AlCl)3) Ferrous sulfate heptahydrate (FeSO)4 7H2O), polyacrylamide.
In a preferred embodiment of the sludge-dewatering agent of the present invention, the calcium salt is at least one of calcium oxalate, calcium carbonate and calcium chloride, and the oxide is at least one of calcium oxide, calcium peroxide and 30% hydrogen peroxide.
In a preferred embodiment of the sludge-dewatering agent of the present invention, the calcium salt is calcium oxalate and the oxide is calcium oxide.
As a preferable embodiment of the sludge-dewatering agent of the present invention, the mass ratio of the calcium oxide to the calcium oxalate is 1: 3.
When the mass ratio of calcium oxide to calcium oxalate in the sludge dehydrating agent is 1:3, the sludge dehydrating agent has the best dehydrating effect, and can reduce the specific resistance and the water content of sludge to a greater extent.
The invention also provides a sludge dewatering method, which adopts the sludge dewatering agent.
The preferable embodiment of the sludge dewatering method of the present invention comprises the following steps:
(1) adding an agent A into the sludge, and stirring;
(2) then adding the agent B and stirring;
(3) and (3) injecting the sludge treated in the step (2) into a plate-and-frame filter press for mechanical filter pressing to obtain the treated sludge.
In a preferred embodiment of the method for dewatering sludge according to the present invention, the sludge is concentrated sludge having a water content of 93% to 98%.
In a preferred embodiment of the sludge dewatering method according to the present invention, in the step (1), the stirring time is 15 minutes; in the step (2), the stirring time is 15 minutes.
Compared with the prior art, the invention has the beneficial effects that:
(1) the sludge dehydrating agent disclosed by the invention is used for dehydrating sludge, so that the specific resistance value of the sludge is in a range suitable for mechanical dehydration, the water content of the sludge is reduced, the volume of the sludge is reduced, and a foundation is laid for final treatment and application of the sludge;
(2) compared with the most advanced dehydration technology (the water content is 30-40%), the invention reduces the water content to be lower (20%) after dehydration, better solves the technical problem, realizes technical innovation, is an economic and effective sludge pretreatment technology without secondary pollution risk, and can be popularized and used in the water treatment process;
(3) the sludge hydrolysis process has the advantages of low energy consumption, low operation cost, simple equipment, low investment, convenient operation management and easy implementation, improves the deep sludge dewatering efficiency and shortens the operation time.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
A certain chemical plant generates concentrated sludge with water content of 97% every day, and a sludge deep dehydration conditioner is prepared according to the small test result of the sludge, wherein in each liter of sludge, the A agent comprises: 3.2g ferric chloride hexahydrate; the component of the agent B is: 0.1g of calcium chloride and 4.9g of 30% hydrogen peroxide. Adding the agent A into the concentrated sludge with the water content of about 97 percent, stirring for 15 minutes, and then adding the agent BStirring was continued for 15 minutes. After the sludge is conditioned by the conditioner, the sludge is injected into a plate-and-frame filter press by a sludge pump, and the specific resistance after conditioning is measured to be 2.8 multiplied by 1010m/kg, the specific resistance is reduced by nearly ninety times, and the water content of the obtained dry sludge is 20 percent.
Example 2
A chemical plant generates 94% of concentrated sludge water content every day, and a sludge deep dehydration conditioner is prepared according to a small test result of the sludge, wherein in each liter of sludge, the A agent comprises: 9.3g of aluminum chloride; the component of the agent B is: 0.4g of calcium oxide and 4.8g of calcium carbonate. Adding the agent A into the concentrated sludge with the water content of about 94 percent, stirring for 15 minutes, adding the agent B into the concentrated sludge, and continuing stirring for 15 minutes. After the sludge is conditioned by the conditioner, the sludge is injected into a plate-and-frame filter press by a sludge pump, and the specific resistance after conditioning is measured to be 4.7 multiplied by 1010m/kg, the specific resistance is reduced by fifty times, and the water content of the obtained dry sludge is 15%.
Example 3
A certain chemical plant generates 93% of concentrated sludge moisture content every day, and a sludge deep dehydration conditioner is prepared according to a small test result of the sludge, wherein in each liter of sludge, the A agent comprises: 6.8g ferrous sulfate heptahydrate; the component of the agent B is: 0.9g of calcium oxide and 1.5g of calcium chloride. Adding the agent A into the concentrated sludge with the water content of about 93 percent, stirring for 15 minutes, adding the agent B into the concentrated sludge, and continuously stirring for 15 minutes. After the sludge is conditioned by the conditioner, the sludge is injected into a plate-and-frame filter press by a sludge pump, and the specific resistance after conditioning is measured to be 9.3 multiplied by 109m/kg, the specific resistance is reduced by two hundred times, and the water content of the obtained dry sludge is 17 percent.
Example 4
The water content of concentrated sludge produced by a certain chemical plant every day is 98%, and a sludge deep dehydration conditioner is prepared according to the small test result of the sludge, wherein in each liter of sludge, the A agent comprises: 9g of polyacrylamide; the component of the agent B is: 1g of calcium oxalate and 2.7g of 30 percent hydrogen peroxide. Adding the agent A into the concentrated sludge with the water content of about 98%, stirring for 15 minutes, adding the agent B into the concentrated sludge, and continuing stirring for 15 minutes. After the sludge is conditioned by the conditioner, the sludge is injected into a plate-and-frame filter press by a sludge pump, and the specific resistance after conditioning is measured to be 8.1 multiplied by 109m/kg, the specific resistance is reduced by three hundred times, and the water content of the obtained dry sludge is 16 percent.
Effect example 1
The selection and the dosage of the calcium salt and the oxide in the agent B influence the dehydration effect of the sludge dehydrating agent, and test groups 1-9 are set for investigating the influence of the selection and the dosage of the calcium salt and the oxide in the agent B on the dehydration effect. In test groups 1 to 9, only the selection and the amount of calcium salts and oxides were different, the treated sludge, agent a and the dewatering method were the same as in example 1, and the selection and the amount of calcium salts and oxides in test groups 1 to 9 are shown in table 1. The specific resistance of the sludge and the water content of the dry sludge were measured according to the methods described in examples 1 to 4, and the results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the selection and the amount of the calcium salt and the oxide of the present invention affect the dewatering effect of the sludge dewatering agent, and when the selection and the amount of the calcium salt and the oxide are within the range of the present invention, the sludge dewatering agent of the present invention has a good dewatering effect; when calcium oxalate is selected as the calcium salt and calcium oxide is selected as the oxide, and the mass ratio of the calcium oxide to the calcium oxalate is 1:3, the sludge dehydrating agent has the best dehydrating effect, and the specific resistance value and the water content of the dehydrated sludge are minimized.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The sludge dehydrating agent is characterized by comprising an agent A and an agent B, wherein the agent A is a removal assisting agent, and the agent B comprises calcium salt and oxide.
2. The sludge dewatering agent according to claim 1, wherein the amount of the removal aid in the agent A is 3.2 to 9.3g, the amount of the calcium salt in the agent B is 0.1 to 4.8g, and the amount of the oxide in the agent B is 0.4 to 4.9g per liter of sludge.
3. The sludge dewatering agent according to claim 1, wherein the removal-assisting agent is at least one of ferric chloride hexahydrate, aluminum chloride, ferrous sulfate heptahydrate, and polyacrylamide.
4. The sludge-dewatering agent according to claim 1, wherein the calcium salt is at least one of calcium oxalate, calcium carbonate and calcium chloride, and the oxide is at least one of calcium oxide, calcium peroxide and 30% hydrogen peroxide.
5. The sludge dewatering agent according to claim 4, wherein the calcium salt is most preferably calcium oxalate and the oxide is most preferably calcium oxide.
6. The sludge-dewatering agent according to claim 5, wherein the mass ratio of calcium oxide to calcium oxalate is 1: 3.
7. A sludge dewatering method characterized by using the sludge dewatering agent according to any one of claims 1 to 6.
8. The sludge dewatering method of claim 7, comprising the steps of:
(1) adding an agent A into the sludge, and stirring;
(2) then adding the agent B and stirring;
(3) and (3) injecting the sludge treated in the step (2) into a plate-and-frame filter press for mechanical filter pressing to obtain the treated sludge.
9. The method of sludge dewatering according to claim 7, characterized in that the sludge is a concentrated sludge having a water content of 93% to 98%.
10. The sludge dewatering method according to claim 8, wherein in the step (1), the stirring time is 15 minutes; in the step (2), the stirring time is 15 minutes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111635113A (en) * | 2020-04-27 | 2020-09-08 | 同济大学 | Method for dewatering and conditioning sludge by using calcium peroxide |
| CN112723705A (en) * | 2020-12-30 | 2021-04-30 | 山东大学 | Method for using sludge subjected to calcium-increasing drying pretreatment as main raw material and fuel for cement production |
| CN114230135A (en) * | 2021-12-08 | 2022-03-25 | 碳中和(山东)产业发展有限公司 | Sludge treatment and disposal technology |
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| CN1986788A (en) * | 2006-12-12 | 2007-06-27 | 广州铬德工程有限公司 | Sludge dewatering chemical amendment and its dewatering method |
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| CN112723705A (en) * | 2020-12-30 | 2021-04-30 | 山东大学 | Method for using sludge subjected to calcium-increasing drying pretreatment as main raw material and fuel for cement production |
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