CN113683279A - Dehydration method of thermal hydrolysis anaerobic digestion sludge - Google Patents
Dehydration method of thermal hydrolysis anaerobic digestion sludge Download PDFInfo
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- CN113683279A CN113683279A CN202111059178.XA CN202111059178A CN113683279A CN 113683279 A CN113683279 A CN 113683279A CN 202111059178 A CN202111059178 A CN 202111059178A CN 113683279 A CN113683279 A CN 113683279A
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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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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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
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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Abstract
The invention discloses a dehydration method of pyrohydrolysis anaerobic digestion sludge, which comprises the following steps: adding titanium salt into the digested sludge subjected to the thermal hydrolysis anaerobic digestion treatment, and uniformly stirring to obtain sludge with the pH value of 6.5-7.0; adding an organic polymer into the sludge with the pH value of 6.5-7.0, and stirring to flocculate to obtain a mixed solution; and dehydrating the mixed solution. The method has the advantages of less reagent dosage, simple conditioning process, no odor in the production process, low water content of mud cakes, no introduction of calcium, magnesium, iron and other ions which are easy to cause scaling of an anaerobic ammonia oxidation pipeline and blockage of an ultrafiltration membrane in a reclaimed water workshop, convenience for subsequent resource treatment of the mud cakes and anaerobic ammonia oxidation treatment of filtrate, and good application prospect in the field of deep dehydration of thermally hydrolyzed anaerobic digested sludge.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a dehydration method for thermally hydrolyzing anaerobic digested sludge.
Background
In the process of urban sewage treatment, a large amount of sludge is often generated, including primary sedimentation tank sludge, secondary sedimentation tank excess sludge and digested sludge, and the volume of the sludge accounts for 0.3-0.5% of the total treated water. The water content of the sludge is as high as 95-99.5%, so that dehydration treatment is required to reduce the mass and volume of the sludge and lay a good foundation for subsequent treatment and disposal.
In the sewage treatment process, thermal hydrolysis anaerobic digestion is a new treatment technology for sludge reduction, reclamation and harmlessness, and is gradually paid attention by all parties by virtue of the advantages of small occupied area, high digestion efficiency, large gas production and the like. Specifically, the thermal hydrolysis anaerobic digestion process comprises the steps of firstly carrying out thermal hydrolysis and flash evaporation treatment on sludge at high temperature (155-170 ℃) and high pressure (6bar) to hydrolyze extracellular polymers and macromolecular organic matters in the sludge and break cell walls of microorganisms in the sludge, then adding water to dilute and cool, and then sending into an anaerobic digestion system for digestion treatment. Because the digested sludge flocs are obviously reduced, the alkalinity and the ammonia nitrogen content are greatly improved, the flocculation performance of the sludge is greatly reduced, the filtration behavior is obviously worsened, and the sludge is not easy to dehydrate, so the digested sludge needs to be conditioned and then sent to the subsequent process.
The traditional conditioning scheme is mostly to add coagulant into the digested sludge. However, when the traditional scheme is adopted for conditioning the sludge cake, the required dosage is high, the productivity is insufficient, the water content of the sludge cake is higher, and the ammonia release amount is large; in addition, the sludge after the thermal hydrolysis anaerobic digestion treatment needs to be sent to an anaerobic ammonia oxidation system and a reclaimed water workshop for subsequent treatment, however, the currently commonly used coagulant contains ions such as calcium, magnesium, iron and the like, and the ions are easy to cause scaling of the anaerobic ammonia oxidation system and blockage of an ultrafiltration membrane in the reclaimed water workshop, so that the normal operation of the anaerobic ammonia oxidation system and the reclaimed water system is seriously influenced.
Disclosure of Invention
The invention mainly aims to provide a dehydration method for thermally hydrolyzing anaerobic digested sludge, and aims to solve the problem that equipment in subsequent processes is easy to block by a traditional conditioning scheme.
In order to achieve the above object, the present invention provides a method for dehydrating thermally hydrolyzed anaerobic digested sludge, comprising the steps of:
adding titanium salt into the digested sludge subjected to the thermal hydrolysis anaerobic digestion treatment, and uniformly stirring to obtain sludge with the pH value of 6.5-7.0;
adding an organic polymer into the sludge with the pH value of 6.5-7.0, and stirring to flocculate to obtain a mixed solution;
and dehydrating the mixed solution.
Optionally, the titanium salt comprises titanium tetrachloride or titanium sulfate.
Optionally, in the step of adding titanium salt into the digested sludge subjected to the thermal hydrolysis anaerobic digestion treatment and uniformly stirring to obtain sludge with the pH value of 6.5-7.0, the stirring time is 3-5 min.
Optionally, in the step of adding titanium salt into the digested sludge subjected to the thermal hydrolysis anaerobic digestion treatment and uniformly stirring to obtain sludge with the pH value of 6.5-7.0, the pH value of the obtained sludge is 6.5-6.8.
Optionally, the organic polymer comprises a cationic flocculant or chitosan.
Optionally, in the step of adding an organic polymer to the sludge with the pH of 6.5-7.0, and stirring to flocculate to obtain a mixed solution, the amount of the organic polymer added is 1.5% -2.0% of the digested sludge.
Optionally, in the step of adding an organic polymer to the sludge with the pH of 6.5-7.0, and stirring to flocculate to obtain a mixed solution, the stirring time is 3-5 min.
Optionally, in the step of performing dehydration on the mixed solution, a membrane plate and frame filter press is used for performing the dehydration.
Optionally, the water content of the dewatered cake is not higher than 60%.
Optionally, before the step of adding titanium salt into the digested sludge after the thermal hydrolysis anaerobic digestion treatment and uniformly stirring to obtain sludge with the pH of 6.5-7.0, the method further comprises the following steps:
and stirring the digested sludge after the thermal hydrolysis anaerobic digestion treatment.
According to the technical scheme provided by the invention, the digested sludge is preconditioned by using titanium salt, colloidal particles in the sludge are promoted to destabilize and generate primary coagulation by using a compressed double electric layer and an electric neutralization effect of the titanium salt, and on the basis, the sludge is connected into a large flocculating constituent by adding the organic polymer and using the adsorption bridging and net catching and sweeping effects of the organic polymer, so that the deep dehydration of the digested sludge is facilitated. The method has the advantages of less reagent dosage, simple conditioning process, no odor in the production process, low water content of mud cakes, no introduction of calcium, magnesium, iron and other ions which are easy to cause scaling of an anaerobic ammonia oxidation pipeline and blockage of an ultrafiltration membrane in a reclaimed water workshop, convenience for subsequent resource treatment of the mud cakes and anaerobic ammonia oxidation treatment of filtrate, and good application prospect in the field of deep dehydration of thermally hydrolyzed anaerobic digested sludge.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of one embodiment of a method for dewatering thermally hydrolyzed, anaerobically digested sludge provided by the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The thermal hydrolysis anaerobic digestion process comprises the steps of firstly carrying out thermal hydrolysis and flash evaporation treatment on sludge at high temperature (155-170 ℃) and high pressure (6bar) to hydrolyze extracellular polymers and macromolecular organic matters in the sludge and break cell walls of microorganisms in the sludge, then adding water to dilute and cool, and then sending into an anaerobic digestion system for digestion treatment. Because the digested sludge flocs are obviously reduced, the alkalinity and the ammonia nitrogen content are greatly improved, the flocculation performance of the sludge is greatly reduced, the filtration behavior is obviously worsened, and the sludge is not easy to dehydrate, so the digested sludge needs to be conditioned and then sent to the subsequent process.
The traditional conditioning scheme is mostly to add coagulant into the digested sludge. However, when the traditional scheme is adopted for conditioning the sludge cake, the required dosage is high, the productivity is insufficient, the water content of the sludge cake is higher, and the ammonia release amount is large; in addition, the sludge after the thermal hydrolysis anaerobic digestion treatment needs to be sent to an anaerobic ammonia oxidation system and a reclaimed water workshop for subsequent treatment, however, the currently commonly used coagulant contains ions such as calcium, magnesium, iron and the like, and the ions are easy to cause scaling of the anaerobic ammonia oxidation system and blockage of an ultrafiltration membrane in the reclaimed water workshop, so that the normal operation of the anaerobic ammonia oxidation system and the reclaimed water system is seriously influenced.
In view of the above, the present invention provides a method for dewatering thermally hydrolyzed anaerobic digested sludge, and fig. 1 is a specific example of the method for dewatering thermally hydrolyzed anaerobic digested sludge according to the present invention.
Referring to fig. 1, the dehydration method of thermally hydrolyzing anaerobic digestion sludge includes the steps of:
and step S10, adding titanium salt into the digested sludge after the thermal hydrolysis anaerobic digestion treatment, and uniformly stirring to obtain sludge with the pH value of 6.5-7.0.
According to the invention, titanium salt is added into the digested sludge, the pH of the digested sludge is adjusted from alkalinity to neutrality to faintly acid, and simultaneously, through the compression of a double electric layer and the electric neutralization, the destabilization of colloidal particles in the sludge is promoted and the primary coagulation is generated. The specific type of the titanium salt is not limited in the invention, and any titanium salt can be used; the addition amount of the titanium salt is based on the pH value of the treated sludge, specifically, the titanium salt is added and the sludge is stirred until the pH value of the sludge is 6.5-7.0, and when the pH value of the sludge is in the range, the subsequent aggregation and flocculation are facilitated. Further, the titanium salt is preferably titanium tetrachloride or titanium sulfate; the pH of the treated sludge is preferably 6.5 to 6.8.
In order to promote the titanium salt to be fully mixed and act, the stirring time is preferably 3-5 min.
In addition, the method is suitable for digested sludge subjected to thermal hydrolysis and anaerobic digestion treatment, namely the sludge with the solid content of 15% -20% is subjected to high-temperature and high-pressure thermal hydrolysis and flash evaporation pretreatment, is diluted by water, is cooled, enters an anaerobic digestion system, and is discharged after staying for a certain time.
In order to further improve the titanium salt action efficiency, before step S10, the method may further include:
and step S100, stirring the digested sludge subjected to the thermal hydrolysis anaerobic digestion treatment.
The digested sludge is stirred to be fully and uniformly mixed, which is beneficial to the uniform distribution of titanium salt and plays a role. In this embodiment, the stirring time is preferably 2 to 3 min.
And step S20, adding an organic polymer into the sludge with the pH value of 6.5-7.0, and stirring to flocculate to obtain a mixed solution.
According to the invention, organic polymer is added into the sludge conditioned by titanium salt, and the adhesive tape particles in the system are further aggregated to form large-particle floccules through the adsorption bridging and net catching rolling sweeping effects, so that the deep dehydration of the digested sludge is facilitated.
The organic polymer is preferably a cationic flocculant or chitosan, and the cationic flocculant and the chitosan can exert better flocculation effect compared with other organic polymers. The addition amount of the organic polymer is 1.5-2.0% of the digested sludge. In addition, after the organic polymer is added, it is necessary to stir and mix it uniformly in order to exert the adsorption bridging and net trapping sweeping effects, and based on this, the stirring time is preferably 3 to 5 min.
Step S30 is to dehydrate the mixed solution.
In specific implementation, various methods such as precipitation, filtration, centrifugation, filter pressing and the like can be adopted for dehydration treatment, and the membrane plate-and-frame filter press is preferably adopted for dehydration treatment in view of comprehensive consideration of dehydration effect, hardware and operation cost. After the treatment, the water content of the mud cake dehydrated by the method is not higher than 60 percent.
The method has the advantages of small reagent adding amount, simple conditioning process, no odor in the production process, low water content of mud cakes and low water content of mud cakes obtained after dehydration, and can be used for resource treatment in the fields of mine restoration, forest land utilization and the like; calcium, magnesium, iron and other ions which are easy to cause scale formation of an anaerobic ammonia oxidation pipeline and blockage of an ultrafiltration membrane in a reclaimed water workshop are not introduced into the obtained filtrate, so that the subsequent anaerobic ammonia oxidation treatment is facilitated. The method has good application prospect in the field of deep dehydration of the thermal hydrolysis anaerobic digestion sludge.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
The following examples and comparative examples all adopt the same batch of digested sludge, the digested sludge is obtained by pretreating sludge with a solid content of 15-20% by high-temperature high-pressure pyrohydrolysis and flash evaporation, adding water for dilution, cooling, entering an anaerobic digestion system, and discharging the digested sludge after staying for a certain time, wherein the water content of the digested sludge is 96%.
Example 1
(1) The digested sludge was stirred for 3min with a stirrer.
(2) And adding titanium tetrachloride into the stirred digested sludge, and stirring for 4min to ensure that the pH value of the sludge is 6.7. The adding amount of the titanium tetrachloride is 1.6 percent of the total weight of the digested sludge.
(3) And (3) adding a cationic flocculant or chitosan accounting for 1.8 percent of the total weight of the digested sludge into the sludge obtained by the treatment in the step (2), and stirring for 4min to obtain a mixed solution distributed with large granular flocculants.
(4) And (3) carrying out filter pressing on the mixed liquid by adopting a diaphragm plate-and-frame filter press to obtain a mud cake with the water content of 57%.
Example 2
(1) The digested sludge was stirred for 3min with a stirrer.
(2) And adding titanium tetrachloride into the stirred digested sludge, and stirring for 5min to ensure that the pH value of the sludge is 6.5. The adding amount of the titanium tetrachloride is 2.0 percent of the total weight of the digested sludge.
(3) And (3) adding a cationic flocculant or chitosan accounting for 1.5 percent of the total weight of the digested sludge into the sludge obtained by the treatment in the step (2), and stirring for 5min to obtain a mixed solution distributed with large granular flocculants.
(4) And (3) carrying out filter pressing on the mixed solution by adopting a diaphragm plate-and-frame filter press to obtain a mud cake with the water content of 55%.
Example 3
(1) The digested sludge was stirred for 2min with a stirrer.
(2) And adding titanium tetrachloride into the stirred digested sludge, and stirring for 3min to ensure that the pH value of the sludge is 6.6. The adding amount of the titanium tetrachloride is 1.8 percent of the total weight of the digested sludge.
(3) And (3) adding a cationic flocculant or chitosan accounting for 1.6 percent of the total weight of the digested sludge into the sludge obtained by the treatment in the step (2), and stirring for 3min to obtain a mixed solution distributed with large granular flocculants.
(4) And (3) carrying out filter pressing on the mixed solution by adopting a diaphragm plate-and-frame filter press to obtain a mud cake with the water content of 56%.
Example 4
(1) The digested sludge was stirred for 2.5min with a stirrer.
(2) And adding titanium sulfate into the stirred digested sludge, and stirring for 5min to ensure that the pH value of the sludge is 6.8. The adding amount of the titanium sulfate is 1.8 percent of the total weight of the digested sludge.
(3) And (3) adding a cationic flocculant or chitosan accounting for 1.9 percent of the total weight of the digested sludge into the sludge obtained by the treatment in the step (2), and stirring for 5min to obtain a mixed solution distributed with large granular flocculants.
(4) And (3) carrying out filter pressing on the mixed solution by adopting a diaphragm plate-and-frame filter press to obtain a mud cake with the water content of 55%.
Example 5
(1) The digested sludge was stirred for 3min with a stirrer.
(2) And adding titanium sulfate into the stirred digested sludge, and stirring for 5min to ensure that the pH value of the sludge is 7.0. The adding amount of the titanium sulfate is 1.4 percent of the total weight of the digested sludge.
(3) And (3) adding a cationic flocculant or chitosan accounting for 2.0 percent of the total weight of the digested sludge into the sludge obtained by the treatment in the step (2), and stirring for 5min to obtain a mixed solution distributed with large granular flocculants.
(4) And (3) carrying out filter pressing on the mixed solution by adopting a diaphragm plate-and-frame filter press to obtain a mud cake with the water content of 56%.
Comparative example 1
The procedure was the same as in example 1 except for the step (2). The mud cake obtained in this comparative example had a water content of 83%.
Comparative example 2
The procedure was the same as in example 1 except for the step (3). The mud cake obtained in this comparative example had a water content of 85%.
Comparative example 3
The procedure was as in example 1 except that the cationic flocculant in step (3) was changed to ferric sulfate. In the comparative example, the amount of ferric sulfate added was 2% of the total weight of the digested sludge, and the water content of the obtained cake was 65%.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. A dehydration method of thermally hydrolyzed anaerobic digested sludge is characterized by comprising the following steps:
adding titanium salt into the digested sludge subjected to the thermal hydrolysis anaerobic digestion treatment, and uniformly stirring to obtain sludge with the pH value of 6.5-7.0;
adding an organic polymer into the sludge with the pH value of 6.5-7.0, and stirring to flocculate to obtain a mixed solution;
and dehydrating the mixed solution.
2. The method for dewatering pyrohydrolyzed anaerobic digested sludge according to claim 1, wherein the titanium salt comprises titanium tetrachloride or titanium sulfate.
3. The method for dehydrating thermally hydrolyzed anaerobic digested sludge according to claim 1, wherein in the step of adding titanium salt to the digested sludge after the thermal hydrolyzed anaerobic digestion treatment and stirring to obtain sludge with a pH of 6.5 to 7.0, the stirring time is 3 to 5 min.
4. The method for dehydrating the thermally hydrolyzed anaerobic digested sludge according to claim 1, wherein in the step of adding titanium salt to the digested sludge after the thermal hydrolyzed anaerobic digestion treatment and stirring to obtain the sludge having a pH of 6.5 to 7.0, the pH of the obtained sludge is 6.5 to 6.8.
5. The method of dewatering thermally hydrolyzed anaerobically digested sludge according to claim 1, wherein the organic polymer comprises a cationic flocculant or chitosan.
6. The method for dewatering thermally hydrolyzed anaerobic digestion sludge according to claim 1, wherein in the step of adding an organic polymer to the sludge having a ph of 6.5 to 7.0, and stirring to flocculate and obtain a mixed solution, the amount of the organic polymer added is 1.5% to 2.0% of the digested sludge.
7. The method for dewatering thermally hydrolyzed anaerobic digested sludge as claimed in claim 1, wherein the step of adding an organic polymer to the sludge having a ph of 6.5 to 7.0, and stirring for flocculation to obtain a mixed solution, the stirring time is 3 to 5 min.
8. The method for dewatering thermally hydrolyzed anaerobic digested sludge according to claim 1, wherein the step of dewatering the mixed liquor comprises performing the dewatering using a membrane plate and frame filter press.
9. The method for dewatering thermally hydrolyzed anaerobic digested sludge as claimed in claim 1, wherein the step of dewatering the mixed liquor comprises dewatering a cake having a water content of not more than 60%.
10. The method for dewatering thermally hydrolyzed anaerobic digested sludge according to claim 1, wherein before the step of adding titanium salt to the digested sludge after the thermal hydrolyzed anaerobic digestion treatment and stirring to obtain sludge with ph of 6.5 to 7.0, the method further comprises:
and stirring the digested sludge after the thermal hydrolysis anaerobic digestion treatment.
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| CN115432907A (en) * | 2022-09-15 | 2022-12-06 | 北京尚水清源水处理技术有限公司 | Sludge dewatering method by thermal hydrolysis anaerobic digestion |
| CN115572040A (en) * | 2022-10-19 | 2023-01-06 | 北京尚水清源水处理技术有限公司 | A method for judging the conditioning effect of anaerobic digested sludge |
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Application publication date: 20211123 |