CN112661366B - Method and system for cooperative sludge dewatering treatment of aged leachate of refuse landfill - Google Patents
Method and system for cooperative sludge dewatering treatment of aged leachate of refuse landfill Download PDFInfo
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Abstract
The invention discloses a method and a system for cooperative sludge dewatering treatment of aged leachate in a refuse landfill, wherein the method comprises the following steps: mixing the sludge and the aged percolate, adding alkali for alkalization and dehydration to complete the cooperative treatment of the aged percolate and the sludge. The system comprises an alkalization device and a dehydration device. The method for the cooperative sludge dewatering treatment of the aged leachate in the refuse landfill comprises the steps of taking the aged leachate in the refuse landfill as dilution water for sludge dewatering treatment, adding alkali for alkalization treatment and dewatering treatment, improving the wall breaking effect and dewatering performance of sludge, realizing resource utilization of the aged leachate, and having the advantages of simple process, short flow, convenient operation, high treatment efficiency, low medicament dosage, low energy consumption, low cost, good dewatering effect, less secondary pollution and the like.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and relates to a method and a system for cooperative sludge dewatering treatment of aged leachate in a refuse landfill.
Background
At present, municipal sludge (with 90% of water content) is dewatered by common methods such as filter pressing dewatering, heat drying dewatering, electrolytic dewatering and the like. Filter-pressing dehydration (sludge high-dry dehydration) generally needs to add a large amount of inorganic salt compound/inorganic salt + PAM/lime and the like, and sludge is tempered to a state that the dehydration performance is greatly improved, and then is dehydrated like a high-pressure diaphragm plate-and-frame machine, but because a large amount of the above-mentioned agents need to be added in the method, a series of problems can be brought: (1) the water content of the dewatered sludge is still as high as 50 percent and is difficult to reduce to below 45 percent; (2) inorganic substanceThe addition of the salt can improve indexes such as conductivity and the like, so that the treatment equipment is seriously corroded due to the improvement of electrochemical corrosion performance, and the biochemical treatment is difficult due to overhigh conductivity; (3) the use of a large amount of inorganic salt can increase the content of ash in the sludge, so that the sludge yield is large, and the subsequent resource utilization of the sludge is not facilitated, for example, when the mud cake is used for landfill treatment, the stability of a pile is easily influenced due to high content of the inorganic salt, the risk of secondary seepage of salt is increased, and when the mud cake is used for incineration treatment, the incineration heat value is insufficient due to high content of the ash; (4) the property of the filtrate can be changed by adding a large amount of inorganic salt, for example, the filtrate can be introduced with a large amount of inorganic salt, so that the components of the filtrate are complex, the biochemical property of the filtrate is reduced, and secondary pollution (for example, the water quality chromaticity is increased easily due to iron salt, and the aluminum ion in water exceeds the standard easily) is caused easily; (5) except for the preconditioning of strong oxidant, the ammonia nitrogen value in the high-temperature anaerobic digestion sludge pressure filtrate generated by conditioning other processes is generally higher, the treatment difficulty is caused by the unbalance of C/N ratio of the whole filtrate, and ferrous sulfate and H are used2O2The Fenton-like reaction method is used for conditioning, the ammonia nitrogen value can be effectively reduced, but the problems of unstable sludge conditioning, serious corrosion of equipment and high medicament consumption cost exist in the Fenton reaction. Obviously, in the above filter-pressing dehydration method, the conditioner added in large amount is not beneficial to the subsequent incineration/resource treatment of the sludge. The heat drying dehydration generally adopts a mechanical dehydration and heat drying dehydration mode, the mechanical dehydration adopts a conditioning mode of adding PAM for pretreatment to 70% of water content for reheating dehydration, the cost is reduced to a certain extent compared with the single heat drying, or adding and filter pressing dehydration conditioning agents to improve the dehydration performance of the sludge and dehydrating to 60% of water content for reheating dehydration, the cost is obviously reduced, but the same subsequent problems caused by adding high-dry dehydration agents in the filter pressing dehydration exist; meanwhile, the heat drying dehydration also has the problem of high operation cost. The investment cost of the electrolytic dehydration equipment is too high, and even if the water content can be reduced through medicament conditioning and then the electrolytic dehydration is carried out, the operation and maintenance cost is still very high.
The alkaline thermal method as a method for conditioning the sludge, such as lime as an additive of the alkaline thermal method, can improve the dehydration effect of the sludge, but still has the following defects: (1) in the prior art, the dosage of lime is at least 5% of the mass of sludge, the dosage of lime is large, the pH value of a conditioning system exceeds 13, a large amount of acid is needed for adjusting the pH value of post-filtrate, and lime and other medicaments are needed to be compounded for use, so that the equipment cost and the medicament cost are increased; (2) the reaction temperature is low, the wall breaking of the sludge is incomplete, the subsequent dehydration effect is poor, and the reaction time is long, so that the treatment efficiency is low; (3) the sludge dewatering effect is about 50%, the water content of the sludge is still high, and the difficulty of further reducing the water content of the sludge is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for the cooperative sludge dewatering treatment of old leachate in a refuse landfill with simple process, convenient operation, high treatment efficiency, low medicament dosage, low energy consumption, low cost, good dewatering effect and less secondary pollution, and also provides a system for the cooperative sludge dewatering treatment of old leachate in a refuse landfill matched with the method.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for treating aged leachate of a refuse landfill in cooperation with sludge dehydration comprises the following steps:
s1, mixing the sludge and the aged leachate, and adding alkali to obtain sludge containing the aged leachate and the alkali;
s2, alkalizing the sludge containing the aged leachate and alkali obtained in the step S1;
s3, dewatering the sludge after the alkalization treatment in the step S2.
In the method for the cooperative sludge dewatering treatment of the aged leachate of the refuse landfill, in the step S1, the mass ratio of the sludge to the aged leachate is 1: 1-2; the sludge is municipal dewatered sludge; the water content of the sludge is 75-85%; the addition amount of the alkali is 1.2-2% of the total mass of the sludge and the aged percolate; the alkali is quicklime and/or caustic soda.
In the method for the cooperative sludge dewatering treatment of the aged leachate in the refuse landfill, in step S2, the alkalization treatment is to heat the sludge containing the aged leachate and alkali by using steam, raise the temperature to 100-130 ℃, and keep the temperature for 45-60 min; the pressure of the steam is 2 atm-4 atm; the alkalization treatment is carried out under the stirring condition; the rotating speed of the stirring is 120-150 rpm.
In step S2, the method for performing cooperative sludge dewatering treatment on aged leachate of a landfill further includes the following steps: after the alkalization treatment is finished, collecting secondary steam; and (3) preheating sludge containing aged leachate and alkali to 60-80 ℃ by using the collected secondary steam.
In the method for the cooperative sludge dewatering treatment of the aged leachate of the refuse landfill, in step S3, a diaphragm plate-and-frame machine is adopted to dewater the alkalized sludge; in the dehydration treatment process, the mud feeding pressure is controlled to be 10-15 kg, and the squeezing pressure is controlled to be 25-30 kg; the water content of the mud cake obtained after the dehydration treatment is 40-45%; the filtrate obtained after the dehydration treatment may be added to the sludge of step S1 as an alkali source.
The method for the cooperative sludge dewatering treatment of the aged leachate of the landfill site further comprises the following treatment in step S3: cooling the alkalized sludge to below 60 ℃ by taking the aged percolate as cooling liquid.
As a general technical concept, the present invention further provides a system for performing cooperative sludge dewatering treatment on aged leachate of a landfill, which is used for implementing the cooperative sludge dewatering treatment method on aged leachate of a landfill, and the method comprises:
the alkalization device is used for breaking the walls of the sludge containing the aged percolate and alkali;
and the dewatering device is used for dewatering the sludge subjected to the wall breaking treatment.
The system for the cooperative sludge dewatering treatment of the aged leachate of the refuse landfill is further improved and further comprises a regulating tank for mixing the aged leachate, alkali and sludge; a pipeline is arranged between the adjusting tank and the alkalization device and is used for conveying sludge containing aged percolate and alkali to the alkalization device; a pipeline is arranged between the adjusting tank and the dehydration device and is used for conveying the filtrate generated in the dehydration device to the adjusting tank; a preheating device used for preheating sludge containing aged leachate and alkali is arranged between the adjusting tank and the alkalization device, and a pipeline is arranged between the preheating device and the alkalization device and used for conveying secondary steam generated in the alkalization device to the preheating device.
The system for the cooperation of the aged leachate of the refuse landfill and the sludge dewatering treatment is further improved and further comprises a steam generating device for producing saturated or superheated steam; the steam generating device is respectively connected with the preheating device and the alkalization device through pipelines and is used for conveying saturated or superheated steam to the preheating device and the alkalization device.
The system for the cooperative sludge dewatering treatment of the aged leachate of the refuse landfill is further improved and further comprises a heat exchange device, a sludge dewatering device and a sludge dewatering device, wherein the heat exchange device is used for cooling the sludge subjected to wall breaking treatment; the cooling water adopted in the heat exchange device is aged percolate.
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a method for cooperative sludge dewatering treatment of old leachate of a refuse landfill, which takes the old leachate of the refuse landfill as dilution water for sludge dewatering treatment, not only can dilute sludge, reduce sludge viscosity, improve the wall breaking effect of a post-alkalization treatment process on the sludge and improve the dewatering performance of the sludge, but also can utilize the old leachate to carry out water quality regulation on the filtrate after the alkalization treatment with high C/N ratio due to the characteristic that the old leachate has low C/N ratio, so that the water quality condition of the filtrate can meet the requirement of subsequent treatment, the method is favorable for reducing the use amount of medicaments and reducing the cost of sludge dewatering, and the resource utilization of the old leachate can be realized while the wall breaking effect and the dewatering performance of the sludge are improved. In addition, in the invention, the aged leachate is diluted firstly, and then the alkali is added, which is beneficial to conveying the sludge and uniformly mixing with the alkali, and reduces the alkali consumption. The method for treating aged leachate of the refuse landfill in cooperation with sludge dehydration has the advantages of simple process, short flow, convenience in operation, high treatment efficiency, low medicament dosage, low energy consumption, low cost, good dehydration effect, less secondary pollution and the like, and meanwhile, the pH of the obtained filtrate is easy to adjust back, the conductivity is appropriate, the subsequent advanced treatment is easy, and the method has good use value and good application prospect.
(2) In the method, the mass ratio of the sludge to the aged leachate is optimized to be 1: 1-2, the aged leachate can fully dilute the sludge by optimizing the dosage of the aged leachate, the water content of the sludge is adjusted to 90%, the viscosity of the sludge is effectively reduced, the sludge and alkali can be uniformly mixed, the dosage of alkali is reduced, other water sources are not needed, and the cost is lower; meanwhile, the carbon-nitrogen ratio of the subsequent filtrate meets the requirement of biochemical treatment by optimizing the dosage of the aged leachate, and the subsequent advanced treatment can be directly carried out without additional conditioning. In the invention, the addition of alkali is optimized to be 1.2-2% of the total mass of the sludge and the aged percolate, the wall breaking effect and the dehydration performance of the sludge can be ensured while the using amount of the medicament is reduced, and the subsequent pH adjustment back of the filtrate is facilitated.
(3) In the method, in the alkalization treatment process, steam with the pressure of 2-4 atm is adopted to heat sludge containing aged percolate and alkali, the temperature is raised to 100-130 ℃, the temperature is kept for 45-60 min, in the process, high-temperature steam and an alkaline agent are utilized to carry out steam thermal hydrolysis wall breaking and alkalization thermal hydrolysis wall breaking on the sludge, wherein the thermal hydrolysis can not only destroy the structure of sludge floc particles, but also accelerate the decomposition of organic components in the sludge floc particles, and the addition of the alkali can destroy the high-temperature resistance of microbial cells, at the moment, the alkaline substance and the sludge cell wall are subjected to saponification reaction, lipid substances are dissolved, and the cell structure is rapidly destroyed, so that the adoption of steam to heat the sludge containing aged percolate and alkali is more favorable for improving the wall breaking effect and the dehydration performance of the sludge; meanwhile, the sludge is directly heated by the steam, a heat exchange surface is avoided, the energy is efficiently utilized, and the formed high-temperature and high-pressure environment is favorable for shortening the reaction time and reducing the energy consumption.
(4) In the method, the secondary steam collected after the alkalization treatment can be used for preheating the sludge containing the aged percolate and alkali, and the energy consumption for dehydration is reduced by reasonably utilizing the heat energy carried by the secondary steam; meanwhile, the sludge collected after the alkalization can also be used for heating aged percolate, and the heat energy carried by the alkalized sludge can also be reasonably utilized, so that the dehydration energy consumption is reduced.
(5) In the method, the filtrate generated after the dehydration treatment can be used as an alkali source to be supplemented into the sludge so as to ensure that the pH value of the sludge is alkaline, so that the using amount of sludge flocculation dehydration medicaments and the sludge dehydration treatment cost can be reduced, and the biochemical treatment amount and the treatment cost can also be reduced. Meanwhile, after dehydration treatment, the water content of the sludge is directly reduced to 40% -45% from 90% -95%, the obtained mud cake can be burned by self, the influence of high water content on the mixed burning heat value of the garbage can be avoided, and the sludge treatment and resource utilization can be realized.
(6) The invention provides a system for cooperative sludge dewatering treatment of old leachate in a refuse landfill, which comprises an alkalization device for performing wall breaking treatment on sludge containing the old leachate and alkali and a dewatering device for performing dewatering treatment on the wall breaking treated sludge. According to the system, the diluted sludge is subjected to wall breaking treatment by using the alkalization device, the dehydration performance of the sludge can be improved, the dehydration device is further used for performing filter pressing on the sludge subjected to wall breaking, the water content of a mud cake is effectively reduced, the system has the advantages of simplicity in operation and maintenance, low cost and the like, low-cost high-quality dehydration of the sludge can be realized, resource utilization of the leachate which is difficult to treat and old can be realized, and the system has very important significance for realizing cooperative treatment of the leachate of the landfill site and the sludge.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Fig. 1 is a schematic flow chart of the cooperative sludge dewatering treatment of aged leachate of a landfill in example 1 of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
Example 1
A method for treating aged leachate of a refuse landfill in cooperation with sludge dewatering is disclosed, wherein a treatment flow chart is shown in figure 1, and the method comprises the following steps:
(1) transporting municipal sludge with the water content of 80% to a sludge storage bin, conveying the sludge and aged leachate to a regulating tank for water quality regulation according to the mass ratio of 1: 1, diluting the sludge by using the aged leachate, adding quicklime, wherein the adding amount of the quicklime is 1.5% of the total mass of the sludge and the aged leachate, and uniformly mixing to obtain the sludge containing the aged leachate and alkali.
(2) Conveying the sludge containing the aged percolate and alkali obtained in the step (1) to a preheating device for preheating treatment, specifically: starting the inner paddle stirrer, and heating the sludge to 60 ℃ by using saturated or superheated steam with the pressure of 2-4 atm at the stirring speed of 120 rpm. The preheating device adopted in the step is a commercial reaction kettle. In this step, saturated or superheated steam is used, which is obtained from a steam generating device (commercially available boiler), and secondary steam (temperature 100 ℃) generated in an alkalizing device is preferably used as a heat source for sludge preheating.
(3) Conveying the sludge preheated in the step (2) to an alkalization device for alkalization treatment, and specifically: starting an inner paddle stirrer, heating sludge from 60 ℃ to 120 ℃ by using saturated or superheated steam with the pressure of 2 atm-4 atm at the stirring speed of 150rpm, keeping the temperature for 60min, performing alkalization reaction in a high-temperature alkaline environment to realize wall breaking treatment on the sludge, and further improving the dehydration performance of the sludge by using adsorption and modification of quicklime. And (3) after the alkalization treatment is explained, opening the pressure release valve, cooling to 100 ℃, separating to obtain secondary steam and sludge subjected to wall breaking treatment, wherein the secondary steam (with the temperature of 100 ℃) generated in the alkalization device is conveyed into a preheating device through a pipeline to preheat the sludge in the step (2). The alkalization device adopted in the step is a commercial thermal alkalization reaction kettle. The saturated or superheated steam used was obtained from a steam generator (commercial boiler).
(4) Conveying the sludge subjected to the wall breaking treatment obtained in the step (3) to a heat exchange device for heat exchange and cooling treatment, and specifically: old leachate is used as cooling liquid, sludge (100 ℃) subjected to wall breaking treatment is cooled until the temperature of the sludge is reduced to 60 ℃, in the process, the old leachate and the sludge exchange heat to realize the preheating of the old leachate, and the old leachate heated by the sludge (the leachate does not return) is conveyed into an adjusting tank through a pipeline between a heat exchange device and the adjusting tank, so that the energy consumption of the preheating device can also be reduced. In the step, the adopted heat exchange device is a commercially available double-pipe heat exchanger.
(5) Conveying the sludge cooled in the step (4) to a dehydration device for dehydration treatment, specifically: conveying the sludge into a high-pressure diaphragm plate-and-frame machine by using a screw pump for squeezing, wherein the sludge inlet pressure is 10 kg, and the squeezing pressure is 30 kg, so as to obtain a filtrate and a mud cake, wherein the water content of the mud cake is 40-45%, the COD of the filtrate is 3000-4000 mg/L, the ammonia nitrogen is 800-1000mg/L, the SS is 500mg/L, the alkalinity is 3000mg/L, and the conductivity is 6000-7000 us/cm. In the step, the filtrate generated after dehydration is divided into two parts, one part can be conveyed into the regulating tank through a pipeline between the dehydration device and the regulating tank, not only can the sludge be diluted, but also the residual alkali in the filtrate can be further utilized, the chemical consumption and the treatment cost of water treatment are reduced, and the other part is subjected to biochemical treatment or deep treatment after pH value regulation. In the step, the sludge generated after the dehydration treatment can be subjected to sludge treatment or resource utilization, such as direct incineration.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (9)
1. A method for cooperative sludge dewatering treatment of aged leachate in a refuse landfill is characterized by comprising the following steps:
s1, mixing the sludge and the aged leachate in a regulating tank, and adding alkali to obtain sludge containing the aged leachate and the alkali;
s2, alkalizing the sludge containing the aged percolate and alkali obtained in the step S1; the alkalization treatment is to heat sludge containing aged percolate and alkali by adopting steam; after the alkalization treatment is finished, collecting secondary steam, and preheating sludge containing aged leachate and alkali by using the collected secondary steam;
s3, dehydrating the sludge subjected to the alkalization treatment in the step S2; adding the filtrate obtained after the dehydration treatment into the sludge in the step S1 as an alkali source;
in step S3, the method further includes: and cooling the alkalized sludge by taking the aged percolate as cooling liquid, and refluxing the aged percolate subjected to heat exchange into the regulating tank.
2. The method for the cooperative sludge dewatering treatment of the aged leachate in the refuse landfill according to claim 1, wherein in step S1, the mass ratio of the sludge to the aged leachate is 1: 1-2; the sludge is municipal dewatered sludge; the water content of the sludge is 75-85%; the adding amount of the alkali is 1.2-2% of the total mass of the sludge and the aged percolate; the alkali is quicklime and/or caustic soda.
3. The method for the cooperative sludge dewatering treatment of the aged leachate in the refuse landfill as claimed in claim 2, wherein in step S2, the sludge containing the aged leachate and alkali is heated by steam, the temperature is raised to 100-130 ℃, and the temperature is maintained for 45-60 min; the pressure of the steam is 2 atm-4 atm; the alkalization treatment is carried out under the stirring condition; the rotating speed of the stirring is 120 rpm-150 rpm.
4. The method for the cooperative sludge dewatering treatment of the aged leachate in the landfill as claimed in claim 3, wherein in step S2, the collected secondary steam is used to preheat the sludge containing the aged leachate and alkali to 60-80 ℃.
5. The method for the cooperative dehydration treatment of the aged leachate of the refuse landfill as claimed in any one of claims 1 to 4, wherein in step S3, the alkalized sludge is dehydrated by a diaphragm plate-and-frame machine; in the dehydration treatment process, the mud feeding pressure is controlled to be 10-15 kg, and the squeezing pressure is controlled to be 25-30 kg; the water content of the mud cake obtained after dehydration treatment is 40-45%.
6. The method of claim 5, wherein in step S3, the aged leachate is used as cooling liquid to cool the alkalized sludge to below 60 ℃.
7. A system for cooperative sludge dewatering treatment of old leachate in a landfill site, which is used for implementing the cooperative sludge dewatering treatment method of the old leachate in the landfill site in any one of claims 1 to 6, and comprises the following steps:
the alkalization device is used for breaking the walls of the sludge containing the aged percolate and alkali;
the dehydration device is used for dehydrating the sludge subjected to the wall breaking treatment;
further comprising:
the adjusting tank is used for mixing the aged percolate, alkali and sludge;
a steam generating device for producing saturated or superheated steam;
the heat exchange device is used for cooling the sludge subjected to the wall breaking treatment;
a pipeline is arranged between the adjusting tank and the alkalization device; a pipeline is arranged between the adjusting tank and the dehydration device; the steam generating device is respectively connected with the preheating device and the alkalization device through pipelines; and a pipeline is arranged between the heat exchange device and the regulating tank.
8. The system for the cooperative sludge dewatering treatment of old leachate in the refuse landfill according to claim 7, wherein a preheating device for preheating sludge containing old leachate and alkali is arranged between the adjusting tank and the alkalization device, and a pipeline is arranged between the preheating device and the alkalization device for conveying secondary steam generated in the alkalization device to the preheating device.
9. The system for the cooperative treatment of the aged leachate in the landfill site as claimed in claim 7 or 8, wherein the cooling water adopted in the heat exchange device is the aged leachate.
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| CN115477455A (en) * | 2022-05-12 | 2022-12-16 | 杭州坤灵环境技术有限公司 | Sludge and leachate synergistic full recycling method based on catalytic pyrohydrolysis technology |
| CN117534193A (en) * | 2024-01-10 | 2024-02-09 | 浙江浙能兴源节能科技有限公司 | Method for recycling wastewater in sludge drying incineration plant |
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