CN110590118A - Deep dehydration method for chemical conditioning of sludge garbage and dehydration system - Google Patents
Deep dehydration method for chemical conditioning of sludge garbage and dehydration system Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention relates to a chemical conditioning deep dehydration method for sludge garbage, which comprises the following steps: the method comprises the steps of enabling sludge after sewage treatment to enter a sludge pre-concentration tank, carrying the sludge into a sludge conditioning tank after concentration treatment, enabling a conditioning catalyst to perform chemical reaction with components contained in a sludge solution in the sludge conditioning tank to destroy the internal structure of sludge particles and the surface adsorption structure of sludge particle cells, decomposing internal bound water between the sludge particle cells and the sludge particle cells or on the surface of the sludge particle cells to form sludge slurry, and performing an extrusion deep dehydration process on the sludge solution through a plate-and-frame membrane filter press to enable the water content of the dehydrated sludge cake to be lower than 50%, greatly reducing the water content of the dehydrated sludge cake, and being beneficial to improving the sludge treatment reduction degree. And the sludge cake can be used for preparing organic fertilizer or biomass fuel for cyclic utilization, so that the natural ecological environment balance is protected.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a chemical conditioning deep dehydration method for sludge garbage and a dehydration system thereof, which are used in the field of environmental protection.
[ background of the invention ]
With the increasing social population, the daily production of domestic garbage by consumers is increased, so that the domestic garbage disposal is the most serious social first problem. In order to solve the technical problem of disposing domestic garbage, various garbage disposal methods have been developed, and most of the garbage disposal methods adopt conventional methods such as extrusion, composting, incineration, landfill disposal and the like. In these treatment methods, since the water content of the sludge waste itself is relatively high, the water content of the treated sludge waste residue material is substantially 80% or more, and if the waste residue material carrying 80% or more is subjected to incineration or landfill treatment, the degree of reduction is not high, the original ecological balance of the environment is easily destroyed, and the treatment cost is relatively high.
[ summary of the invention ]
In view of the above, the technical problem to be solved by the present invention is to provide a chemical conditioning deep dehydration method for sludge waste, which can improve the reduction degree of sewage sludge waste treatment, is beneficial to the protection of natural ecological environment balance, and reduces the cost of sewage sludge waste treatment.
The invention aims to solve another technical problem of providing a fully-automatic chemical conditioning deep dehydration system for sewage sludge garbage, which is simple and convenient to operate.
Therefore, the technical scheme of the invention provides a chemical conditioning deep dehydration method for sludge garbage, which comprises the following steps:
the sludge garbage is a hydrophilic organic aggregate which takes extracellular polymeric substances as a framework and is generated in the sewage treatment process, and the hydrophilic organic aggregate is composed of organic residues, inorganic particles and bacterial thalli; the sludge garbage is divided into domestic sewage sludge, feedwater sludge, industrial sewage sludge and river and lake sludge according to the components of the sludge, the treatment process and the property characteristics of the sludge; domestic sewage sludge is taken as an example at present;
firstly, sewage sludge with the water content of 95% is pumped into a sludge conditioning tank through a pipeline pump, then a conditioning catalyst is added into the sludge conditioning tank, a stirrer arranged in the sludge conditioning tank is used for fully and uniformly stirring to form sludge slurry, the sludge slurry and the conditioning catalyst are fully and uniformly mixed, the conditioning catalyst and the sludge slurry are fully reacted, and flocculent sludge slurry is formed in the sludge conditioning tank;
then, the screw pump pumps the sludge slurry into a plate-and-frame membrane filter press, the plate-and-frame membrane filter press separates solid substances and liquid substances in the sludge slurry under the action of high pressure, so that the solid substances are dehydrated and filtered to form sludge cakes, and the sludge cakes can be used as organic fertilizers or biological fuels; the filter liquor after filter pressing dehydration flows into a filter pressing water treatment pool;
inside the filter-pressing water treatment pond, obtain the filtrating through setting up the inside electrolytic sterilizing device in filter-pressing water treatment pond and exterminate the bacterium to the filter-pressing, meanwhile, adsorb or filter some heavy ions of metal in the filtrating through the ionic membrane filter who sets up in the inside of filter-pressing water treatment pond for the filtrating that is discharged by the inside environmental protection requirement that accords with of filter-pressing water treatment pond.
Further limiting, in the sludge conditioning tank conditioning process, the conditioning catalyst is: cationic Polyacrylamide (PAM), aluminum sulfate (AL2(SO4)3), hydrogen peroxide (H2O 2); the adding sequence is that firstly aluminum sulfate (AL2(SO4)3) is added, then cationic Polyacrylamide (PAM) is added, and then hydrogen peroxide (H2O2) is added; the conditioning catalyst has the mass adding ratio of the aluminum sulfate to the cationic polyacrylamide to the hydrogen peroxide of 85: 2: 1; the optimal value is that when the adding amount of aluminum sulfate is 85mg/L, the volume adding amount of cationic polyacrylamide is 2mg/L and the volume adding amount of hydrogen peroxide is 1mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and the value is 48.3%.
Further limiting, in the conditioning process of the sludge conditioning tank, the conditioning catalyst comprises cationic Polyacrylamide (PAM), ferric chloride (Fe Cl3) and hydrogen peroxide (H2O 2); the conditioning mode of the conditioning catalyst is as follows: firstly adding ferric chloride (Fe Cl3), then adding cationic Polyacrylamide (PAM), and then adding hydrogen peroxide (H2O2), wherein the conditioning catalyst is added in a mass adding ratio of aluminum sulfate to the cationic polyacrylamide to the hydrogen peroxide of 70: 2: 0.8; the optimal value is that when the adding amount of ferric chloride is 70mg/L, the adding amount of cationic polyacrylamide is 2mg/L and the adding amount of hydrogen peroxide volume is 0.8mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and the value is 49.6%.
Further limiting, in the conditioning process, the conditioning catalyst component is: ferrous sulfate (FeSO4), cationic Polyacrylamide (PAM), and hydrogen peroxide (H2O 2); the conditioning mode of the conditioning catalyst is as follows: firstly adding ferrous sulfate (FeSO4), then adding cationic Polyacrylamide (PAM), and then adding hydrogen peroxide (H2O2), wherein the conditioning catalyst is added in a mass adding ratio of 80: 3: 1.3 between aluminum sulfate and the cationic polyacrylamide to the hydrogen peroxide; the optimal value is that when the addition amount of ferrous sulfate (FeSO4) is 80mg/L, the addition amount of cationic polyacrylamide is 3mg/L and the volume addition amount of hydrogen peroxide is 1.3mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and is 49.1%.
The utility model provides a mud rubbish chemical conditioning degree of depth dewatering system, this system includes mud sludge conditioning pool, is connected the screw pump with mud conditioning pool, the filter press of sheet frame diaphragm who is connected with the screw pump, sets up in the filter press water treatment pond of sheet frame diaphragm filter press below position to and set up in inside electrolytic sterilizing device and the ionic membrane filter of filter press water treatment pond.
The plate-frame membrane filter press comprises a filter frame shell arranged on the periphery, and filter plates arranged in the filter frame shell and staggered with each other, wherein the filter plates and the filter plates are staggered with each other to form a filter chamber, and filter cloth is arranged in the filter chamber; the area of a single filter plate of the plate-and-frame membrane filter press is 1500 mm X1500 mm, and the conditioned sludge slurry is pressed into the plate by a screw pump for dehydration; the effective filtering area of the filter cloth of the single filter plate of the membrane plate and frame filter press is 1 square meter, the volume of the filter chamber is 15 liters, the sludge with 95 percent of water content is treated once, the sludge treated by the whole machine is about 30 cubic meters, and the maximum sludge inlet pressure and the membrane squeezing pressure are 1.2MP and 2.0MP respectively.
The invention has the beneficial technical effects that: according to the technical scheme, the conditioning catalyst is adopted to sequentially perform chemical reaction with the components contained in the sludge slurry, so that the internal structure between the sludge garbage particles and the sludge garbage particles in the sludge slurry and the surface adsorption structure of the sludge particle cells are destroyed, the internal bound water between the sludge particle cells and the sludge particle cells or on the surfaces of the sludge particle cells is decomposed, and then the sludge garbage solution is subjected to an extrusion deep dehydration process through a plate-and-frame membrane filter press, so that the water content of the dehydrated sludge cake is lower than 50%, the water content of the dehydrated sludge cake is greatly reduced, and the sludge garbage treatment reduction degree is favorably improved. And because the sludge cake can be used for preparing organic fertilizer or biomass fuel for cyclic utilization, the treatment difficulty and cost of the dewatered sludge are reduced, and the aim of protecting the balance of natural ecological environment is fulfilled. Compared with the similar process in the prior art, the dehydration process has the aim of reducing the treatment cost. In addition, the dehydration system of the invention adopts a full-automatic control mode to realize the completion of the whole dehydration method, thereby having the aim of simple and convenient operation.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and embodiments.
[ description of the drawings ]
FIG. 1 is a schematic view of a deep chemical conditioning dewatering system for sludge waste in accordance with the present invention;
[ detailed description ] embodiments
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the following describes a chemical conditioning deep dehydration method for sludge waste, with reference to an embodiment, the method flow is:
the sludge garbage is a hydrophilic organic aggregate which takes extracellular polymeric substances as a framework and is generated in the sewage treatment process, and the hydrophilic organic aggregate is composed of organic residues, inorganic particles and bacterial thalli; the sludge garbage is divided into domestic sewage sludge, feedwater sludge, industrial sewage sludge and river and lake sludge according to the components of the sludge, the treatment process and the property characteristics of the sludge; domestic sewage sludge is taken as an example at present;
firstly, sewage sludge with the water content of 95% is pumped into a sludge conditioning tank through a pipeline pump, then a conditioning catalyst is added into the sludge conditioning tank, a stirrer arranged in the sludge conditioning tank is used for fully and uniformly stirring to form sludge slurry, the sludge slurry and the conditioning catalyst are fully and uniformly mixed, the conditioning catalyst and the sludge slurry are fully reacted, and flocculent sludge slurry is formed in the sludge conditioning tank;
then, the screw pump pumps the sludge slurry into a plate-and-frame membrane filter press, the plate-and-frame membrane filter press separates solid substances and liquid substances in the sludge slurry under the action of high pressure, so that the solid substances are dehydrated and filtered to form sludge cakes, and the sludge cakes can be used as organic fertilizers or biological fuels; the filter liquor after filter pressing dehydration flows into a filter pressing water treatment pool;
inside the filter-pressing water treatment pond, obtain the filtrating through setting up the inside electrolytic sterilizing device in filter-pressing water treatment pond and exterminate the bacterium to the filter-pressing, meanwhile, adsorb or filter some heavy ions of metal in the filtrating through the ionic membrane filter who sets up in the inside of filter-pressing water treatment pond for the filtrating that is discharged by the inside environmental protection requirement that accords with of filter-pressing water treatment pond.
The sludge can be classified into a physical conditioning method and a chemical conditioning method according to its own characteristics. The physical conditioning method is generally to destroy the structure of the sludge by applying mechanical force and release the water in the sludge. The chemical conditioning method is to change the structure of the sludge flocculating constituent by adding medicament or charge neutralization or adsorption bridging. In this embodiment, the conditioning mode is to be conditioned by adding a chemical conditioning catalyst. The conditioning catalyst in the technical scheme selects aluminum sulfate (AL2(SO4)3), ferric chloride (Fe Cl3) and ferrous sulfate (FeSO4) to respectively carry out compound conditioning on cationic Polyacrylamide (PAM) and hydrogen peroxide.
During conditioning, the conditioning catalyst is: cationic Polyacrylamide (PAM), aluminum sulfate (AL2(SO4)3), hydrogen peroxide (H2O 2); the adding sequence is that firstly aluminum sulfate (AL2(SO4)3) is added, then cationic Polyacrylamide (PAM) is added, and then hydrogen peroxide (H2O2) is added; the conditioning catalyst has the mass adding ratio of the aluminum sulfate to the cationic polyacrylamide to the hydrogen peroxide of 85: 2: 1; the optimal value is that when the addition amount of aluminum sulfate is 85mg/L, the addition amount of cationic polyacrylamide is 2mg/L and the addition amount of hydrogen peroxide (H2O2) is 1mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, the water content of the dehydrated sludge cake is the lowest, and the value is 48.3%;
during conditioning, the conditioning catalyst is: cationic Polyacrylamide (PAM), ferric chloride (Fe Cl3), and hydrogen peroxide (H2O 2); the conditioning mode of the conditioning catalyst is as follows: firstly adding ferric chloride (Fe Cl3), then adding cationic Polyacrylamide (PAM), and then adding hydrogen peroxide (H2O2), wherein the conditioning catalyst is added in a mass adding ratio of aluminum sulfate to the cationic polyacrylamide to the hydrogen peroxide of 70: 2: 0.8; the optimal value is that the volume addition amount of ferric chloride is 70mg/L, the addition amount of cationic polyacrylamide is 2mg/L, and when the volume addition amount of hydrogen peroxide is 0.8mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and is 49.6%.
During conditioning, the conditioning catalyst is: ferrous sulfate (FeSO4), cationic Polyacrylamide (PAM), and hydrogen peroxide (H2O 2); the conditioning mode of the conditioning catalyst is as follows: firstly adding ferrous sulfate (FeSO4), then adding cationic Polyacrylamide (PAM), and then adding hydrogen peroxide (H2O2), wherein the conditioning catalyst is added in a mass adding ratio of 80: 3: 1.3 between aluminum sulfate and the cationic polyacrylamide to the hydrogen peroxide; the optimal value is that the addition amount of ferrous sulfate (FeSO4) is 80mg/L, the mass addition amount of cationic polyacrylamide is 3mg/L, and the mass addition amount of hydrogen peroxide is 1.3mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and is 49.1%.
The cationic polyacrylamide is hydrolyzed to form long-chain high molecular substances, which mainly play a role in adsorbing and bridging sewage, sludge and garbage solution, and simultaneously have an electric neutralization function because more cationic groups can be dissociated from the cationic polyacrylamide. Meanwhile, the cationic Polyacrylamide (PAM) can also perform physical and chemical reaction with the negatively charged solute to generate insoluble salt, so that the cationic polyacrylamide plays a role in flocculating and precipitating the solute in water, and the optimal dewatering treatment effect of sludge and mud is improved. In the process, after aluminum sulfate (AL2(SO4)3) or ferric chloride (Fe Cl3) or ferrous sulfate (FeSO4) is dissolved in water, fine particles and natural colloidal particles in the slurry can be agglomerated into large floccules, and the subsequent filter pressing and dewatering in a plate-and-frame filter press are facilitated.
In the conditioning process, the conditioning catalyst comprises cationic Polyacrylamide (PAM), ferric chloride (Fe Cl3), hydrogen peroxide (H2O2) and calcium hydroxide (Ca (OH) 2); the conditioning mode of the conditioning catalyst is as follows: one of the methods is that firstly ferric chloride (Fe Cl3) is added, then cationic Polyacrylamide (PAM) is added, and then hydrogen peroxide (H2O2) is added, so that the optimal mass component proportion is compositely regulated: 0.2 percent of cationic polyacrylamide and 5 percent of ferric chloride; one mode is that calcium hydroxide (Ca (OH)2) is added firstly, then cationic Polyacrylamide (PAM) is added, and then hydrogen peroxide (H2O2) is added, so that the optimal mass component proportion is compounded and conditioned: in another mode, the cationic polyacrylamide accounts for 0.8 percent, and the calcium hydroxide accounts for 4 percent; firstly adding aluminum sulfate (AL2(SO4)3), then adding cationic Polyacrylamide (PAM), and then adding hydrogen peroxide (H2O2), and compounding and conditioning the components in an optimal mass ratio: 0.4% of cationic polyacrylamide and 5% of aluminum sulfate (AL2(SO4) 3); under the three combined conditioning, the capillary water absorption time in the sludge garbage particles can be reduced to be below 20S, or one of the three conditioning can be used independently.
In the conditioning catalysis process, the conditioning catalyst selects cationic polyacrylamide, ferric chloride, calcium hydroxide and coal powder to jointly condition the sludge, so that the dehydration rate of the sludge garbage particles reaches 42.3-45.7%, the content of the combined water of the sludge garbage particles is reduced to 10.21%, and the low calorific value is 6464 kJ/kg-6870 kJ/kg.
The sludge slurry is conditioned by using ferric chloride Fe Cl3 alone, when the addition amount of ferric chloride FeCl3 is 15-20% of the dry weight of the sludge, the capillary water absorption time (CST) is less than 20s, and when the ferric chloride FeCl3 and cationic polyacrylamide PAM are used for combined conditioning, under the condition that the mass addition amount of the cationic polyacrylamide PAM is 0.2% of the dry weight of the sludge, when the addition amount of ferric chloride Fe Cl3 is 5-10% of the dry weight of the sludge, the capillary water absorption time CST is less than 20 s.
The addition amount of aluminum sulfate (AL2(SO4)3) was 5% by dry weight of sludge, and the Capillary Suction Time (CST) reached the minimum value of 12.73s when the mass addition amount of cationic polyacrylamide PAM was changed to 0.35%. Under the condition that the mass addition amount of cationic polyacrylamide PAM is 0.35%, the addition amount of aluminum sulfate Al2(SO4)3 is changed, the capillary water absorption time (CST) of the sludge is firstly reduced and then increased along with the increase of the addition amount of aluminum sulfate Al2(SO4)3, and when the addition amount of aluminum sulfate Al2(SO4)3 is 5%, the capillary water absorption time (CST) reaches the minimum value of 15.3 s. Therefore, the best condition for compounding and conditioning aluminum sulfate Al2(SO4)3 and cationic polyacrylamide PAM is that the addition amount of PAM mass is 0.4%, and the addition amount of Al2(SO4)3 is 5%.
After aluminum sulfate (AL2(SO4)3) of inorganic metal salt, ferric chloride Fe Cl3 and calcium hydroxide Ca (OH)2 are respectively conditioned by combining cationic polyacrylamide PAM, the turbidity of filtrate passing through a plate-and-frame membrane filter press is respectively reduced by 81.2%, 73.9% and 78.2% compared with the turbidity of original sludge. The cationic polyacrylamide PAM is combined with ferric chloride Fe Cl3, calcium hydroxide Ca (OH)2 and coal powder to condition sludge, and the turbidity of filtrate after the plate-and-frame membrane filter press is 9NTU at the lowest. The cationic polyacrylamide PAM is combined with the inorganic salt for conditioning, the turbidity of filtrate passing through the plate-and-frame diaphragm filter press is the lowest, the inorganic metal salt is combined with the cationic polyacrylamide PAM for conditioning sludge, stable and large flocs can be formed, and after the sludge is filtered by the plate-and-frame diaphragm filter press, moisture is released, and the filtrate is clarified.
And (3) conditioning the sludge by selecting iron salt and cationic Polyacrylamide (PAM), and measuring the Specific Resistance (SRF) and capillary water absorption time (CST) of the conditioned sludge. And (3) performing linear regression analysis on the specific resistance SRF and the capillary water absorption time CST by a mathematical statistical method. The result shows that the specific resistance CST and the capillary water absorption time SRF have obvious linear correlation under the condition of the same medicament, and the optimal medicament dosage can be determined by replacing the specific resistance SRF with the capillary water absorption time CST. The Specific Resistance (SRF) and the capillary water absorption time (CST) of the conditioned sludge are used as indexes for measuring the sludge dewatering performance.
The optimal condition for compounding and conditioning the ferric chloride FeCl3 and the cationic polyacrylamide PAM is that the mass addition amount of the cationic polyacrylamide PAM is 0.2 percent, and the addition amount of the ferric chloride FeCl3 is 5 percent; the optimal condition for the compound conditioning of the calcium hydroxide Ca (OH)2 and the cationic polyacrylamide PAM is that the mass addition amount of the cationic polyacrylamide PAM is 0.8 percent, and the mass addition amount of the calcium hydroxide Ca (OH)2 is 4 percent. The best condition for compounding and conditioning aluminum sulfate Al2(SO4)3 and cationic polyacrylamide PAM is that the mass adding amount of the cationic polyacrylamide PAM is 0.4%, and the mass adding amount of aluminum sulfate Al2(SO4)3 is 5%. Under the three combined conditioning conditions, the capillary water absorption time CST of the sludge can be reduced from 80s to below 20 s. (3) Cationic polyacrylamide PAM, ferric chloride Fe Cl3, calcium hydroxide Ca (OH)2 and coal powder are selected to jointly condition sludge, and after a plate-and-frame membrane filter press, the water content of the obtained dewatered sludge cake reaches 42.3% -45.7%, wherein the content of bound water is reduced to 10.21%, and the low calorific value is 6464 kJ/kg-6870 kJ/kg.
The utility model provides a mud rubbish chemical conditioning degree of depth dewatering system, this system includes mud sludge conditioning pool, is connected the screw pump with mud conditioning pool, the filter press of sheet frame diaphragm who is connected with the screw pump, sets up in the filter press water treatment pond of sheet frame diaphragm filter press below position to and set up in inside electrolytic sterilizing device and the ionic membrane filter of filter press water treatment pond.
The plate-frame membrane filter press comprises a filter frame shell arranged on the periphery, and filter plates which are arranged in the filter frame shell in a mutually staggered mode, wherein the filter plates and the filter plates are mutually staggered to form a filter chamber, and filter cloth is arranged in the filter chamber; the area of a single filter plate of the plate-and-frame membrane filter press is 1500 mm X1500 mm, and the conditioned sludge slurry is pressed into the plate by a screw pump for dehydration; the effective filtering area of the filter cloth of the single filter plate of the membrane plate and frame filter press is 1 square meter, the volume of the filter chamber is 15 liters, the sludge with 95 percent of water content is treated once, the sludge treated by the whole machine is about 30 cubic meters, and the maximum sludge feeding pressure and the membrane squeezing pressure are 1.2MP and 2 OMP respectively.
In conclusion, according to the technical scheme, the conditioning catalyst is adopted to perform chemical reaction with the components contained in the sludge slurry in sequence, so that the internal structure between the sludge garbage particles and the sludge garbage particles in the sludge slurry and the surface adsorption structure of the sludge particle cells are destroyed, the internal bound water between the sludge particle cells and the sludge particle cells or on the surfaces of the sludge particle cells is decomposed to form a sludge garbage solution, and then the sludge garbage solution is subjected to an extrusion deep dehydration process through a plate-and-frame membrane filter press, so that the water content of the dehydrated sludge cake is lower than 50%, the water content of the dehydrated sludge cake is greatly reduced, and the sludge garbage treatment reduction degree is favorably improved. And because the sludge cake can be used for preparing organic fertilizer or biomass fuel for cyclic utilization, the treatment difficulty and cost of the dewatered sludge are reduced, and the aim of protecting the balance of natural ecological environment is fulfilled. Compared with the similar process in the prior art, the dehydration process has the aim of reducing the treatment cost. In addition, the dehydration system of the invention adopts a full-automatic control mode to realize the completion of the whole dehydration method, thereby having the aim of simple and convenient operation.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present invention are intended to be within the scope of the claims.
Claims (6)
1. A chemical conditioning deep dehydration method for sludge garbage comprises the following steps:
the sludge garbage is a hydrophilic organic aggregate which takes extracellular polymeric substances as a framework and is generated in the sewage treatment process, and the hydrophilic organic aggregate is composed of organic residues, inorganic particles and bacterial thalli; the sludge garbage is divided into domestic sewage sludge, feedwater sludge, industrial sewage sludge and river and lake sludge according to the components of the sludge, the treatment process and the property characteristics of the sludge; domestic sewage sludge is taken as an example at present;
firstly, pumping sewage sludge with the water content of 95% into a sludge conditioning tank through a screw pump, then adding a conditioning catalyst into the sludge conditioning tank, fully and uniformly stirring by a stirrer arranged in the sludge conditioning tank to form sludge slurry, fully and uniformly mixing the sludge slurry and the conditioning catalyst to fully react the conditioning catalyst with the sludge slurry, and forming flocculent sludge slurry in the sludge conditioning tank;
then, the screw pump pumps the sludge slurry into a plate-and-frame membrane filter press, the plate-and-frame membrane filter press separates solid substances and liquid substances in the sludge slurry under the action of high pressure, so that the solid substances are dehydrated and filtered to form sludge cakes, and the sludge cakes can be used as organic fertilizers or biological fuels; the filter liquor after filter pressing dehydration flows into a filter pressing water treatment pool;
inside the filter-pressing water treatment pond, obtain the filtrating through setting up the inside electrolytic sterilizing device in filter-pressing water treatment pond and exterminate the bacterium to the filter-pressing, meanwhile, adsorb or filter some heavy ions of metal in the filtrating through the ionic membrane filter who sets up in the inside of filter-pressing water treatment pond for the filtrating that is discharged by the inside environmental protection requirement that accords with of filter-pressing water treatment pond.
2. The chemical conditioning deep dehydration method for sludge garbage according to claim 1, characterized in that: in the conditioning process of the sludge conditioning tank, the conditioning catalyst is as follows: cationic Polyacrylamide (PAM), aluminum sulfate (AL2(SO4)3), hydrogen peroxide (H2O 2); the adding sequence is that firstly aluminum sulfate (AL2(SO4)3) is added, then cationic Polyacrylamide (PAM) is added, and then hydrogen peroxide (H2O2) is added; the conditioning catalyst has the mass adding ratio of the aluminum sulfate to the cationic polyacrylamide to the hydrogen peroxide of 85: 2: 1; the optimal value is that when the adding amount of aluminum sulfate is 85mg/L, the adding amount of cationic polyacrylamide is 2mg/L and the adding amount of hydrogen peroxide volume is 1mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and the value is 48.3%.
3. The chemical conditioning deep dehydration method for sludge garbage according to claim 1, characterized in that: in the conditioning process of the sludge conditioning tank, the conditioning catalyst comprises the components of cationic Polyacrylamide (PAM), ferric chloride (Fe Cl3) and hydrogen peroxide (H2O 2); the conditioning mode of the conditioning catalyst is as follows: firstly adding ferric chloride (Fe Cl3), then adding cationic Polyacrylamide (PAM), and then adding hydrogen peroxide (H2O2), wherein the conditioning catalyst is added in a mass adding ratio of aluminum sulfate to the cationic polyacrylamide to the hydrogen peroxide of 70: 2: 0.8; the optimal value is that when the adding amount of ferric chloride is 70mg/L, the adding amount of cationic polyacrylamide is 2mg/L and the adding amount of hydrogen peroxide volume is 0.8mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and the value is 49.6%.
4. The chemical conditioning deep dehydration method for sludge garbage according to claim 1, characterized in that: in the conditioning process, the conditioning catalyst comprises the following components: ferrous sulfate (FeSO4), cationic Polyacrylamide (PAM), and hydrogen peroxide (H2O 2); the conditioning mode of the conditioning catalyst is as follows: firstly adding ferrous sulfate (FeSO4), then adding cationic Polyacrylamide (PAM), and then adding hydrogen peroxide (H2O2), wherein the conditioning catalyst is added in a mass adding ratio of 80: 3: 1.3 between aluminum sulfate and the cationic polyacrylamide to the hydrogen peroxide; the optimal value is that when the addition amount of ferrous sulfate (FeSO4) is 80mg/L, the addition amount of cationic polyacrylamide is 3mg/L and the volume addition amount of hydrogen peroxide is 1.3mg/L, the sludge is dehydrated by a plate and frame filter press after reacting with sludge slurry, and the water content of the dehydrated sludge cake is the lowest and is 49.1%.
5. A dewatering system used for the chemical conditioning deep dewatering method of sludge garbage according to claim 1, which comprises a sludge conditioning pool, a screw pump connected with the sludge conditioning pool, a plate-and-frame membrane filter press connected with the screw pump, a filter-press water treatment pool arranged at the lower position of the plate-and-frame membrane filter press, and an electrolytic sterilizing device and an ionic membrane filter arranged inside the filter-press water treatment pool.
6. The chemical conditioning deep dehydration system for sludge garbage according to claim 5, characterized in that: the plate-frame membrane filter press comprises a filter frame shell arranged on the periphery, and filter plates which are arranged in the filter frame shell in a mutually staggered mode, wherein the filter plates and the filter plates are mutually staggered to form a filter chamber, and filter cloth is arranged in the filter chamber; the area of a single filter plate of the plate-and-frame membrane filter press is 1500 mm X1500 mm, and the conditioned sludge slurry is pressed into the plate by a screw pump for dehydration; the effective filtering area of the filter cloth of the single filter plate of the membrane plate and frame filter press is 1 square meter, the volume of the filter chamber is 15 liters, the sludge with 95 percent of water content is treated once, the sludge treated by the whole machine is about 30 cubic meters, and the maximum sludge feeding pressure and the membrane squeezing pressure are 1.2MP and 2 OMP respectively.
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