CN115611489A - Method for improving anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment - Google Patents
Method for improving anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment Download PDFInfo
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- CN115611489A CN115611489A CN202211049261.3A CN202211049261A CN115611489A CN 115611489 A CN115611489 A CN 115611489A CN 202211049261 A CN202211049261 A CN 202211049261A CN 115611489 A CN115611489 A CN 115611489A
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- sludge
- persulfate
- ultrasonic
- anaerobic digestion
- pretreatment
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- 239000010802 sludge Substances 0.000 title claims abstract description 75
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000029087 digestion Effects 0.000 title claims abstract description 41
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 238000011081 inoculation Methods 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000004913 activation Effects 0.000 abstract 1
- 244000005700 microbiome Species 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000855 fermentation Methods 0.000 description 4
- 230000004151 fermentation Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000696 methanogenic effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 230000002053 acidogenic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention discloses a method for improving anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment. The method comprises the steps of carrying out persulfate pretreatment on excess sludge, then carrying out ultrasonic pretreatment, sealing a reaction vessel, and putting the reaction vessel into a water bath constant temperature oscillator for culture. The ultrasonic can obviously promote the activation of persulfate, and the activated persulfate releases excessive sulfate radicals and hydroxyl radicals to act on sludge flocs together with the cavitation effect and the mechanical effect generated by ultrasonic energy, so that the breaking of the sludge is promoted, the anaerobic digestion conversion efficiency is improved, and the methane yield is improved. The invention utilizes ultrasonic persulfate to carry out combined pretreatment on excess sludge for anaerobic digestion, improves the anaerobic digestion efficiency, greatly improves the yield of methane in the anaerobic digestion process, and provides a new idea for solving the problem of sludge treatment in China.
Description
Technical Field
The invention relates to solid waste resource regeneration, in particular to a method for improving anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment.
Background
At present, the number of urban sewage treatment plants and the sewage treatment capacity in China are greatly increased. The sewage treatment process is accompanied by a large amount of excess sludge. According to statistics, the yield of the excess sludge in China in 2013 reaches 3500 million tons (the water content is 80%), and the increase rate is increased by 20% every year. On the one hand, global resource and energy crisis is are increasing. On the other hand, the sludge contains rich bioavailable organic matters, so the resource treatment of the sludge is the issue which is widely concerned at present, and in the process, the sludge can be effectively reduced and harmlessly treated, and the effective recovery of energy and resources can be realized.
Anaerobic digestion of sludge is a common sludge resource utilization means, and methane, which is a high-quality energy substance, can be generated in the process. However, most of organic matters contained in the sludge are mainly distributed in extracellular polymeric substances and intracellular organic matters wrapped by cell walls, and are difficult to be directly utilized by anaerobic microorganisms, so that the sludge breaking process is considered as a rate-limiting step of anaerobic digestion of the sludge. In addition, the anaerobic digestion process of the sludge is a biological process with the participation of various microorganisms, and methanogenic microorganisms and acidogenic and hydrogenogenic microorganisms coexist in large quantity. In order to improve the effect of methane production by anaerobic digestion of sludge, some sludge treatment methods such as an ultrasonic method, a microwave method, an acid-base method, a heat treatment method, an advanced oxidation method and a combined treatment method are applied to promote sludge disintegration, so that not only are a large number of organic matters in the sludge released, but also a large amount of available substrates are provided for methanogenic microorganisms, and the methane production is remarkably promoted, thereby greatly improving the methane yield. However, the method has a complex operation flow, and additional chemical substances or energy are required, so that long-term large-scale application is difficult to realize.
Ultrasonic waves are considered as a kind of energy having a frequency higher than 20kHz, have characteristics of high frequency, short wavelength, good beaming property and directivity, and have been widely used in various fields of human production and life. Ultrasonic waves are a common physical method, and in 2001, germany has been reported to have practical application in sludge treatment processes under the action of ultrasonic waves. Meanwhile, in the persulfate advanced oxidation technology, sodium persulfate is one of more ideal experimental materials because of good solubility in water and relatively stable chemical properties.
Disclosure of Invention
The invention aims to provide a method for improving methane production through anaerobic digestion of sludge by ultrasonic persulfate pretreatment, and the method can be used for overcoming the technical problems of low treatment efficiency, incomplete digestion and the like in the existing anaerobic digestion technology.
The technical scheme adopted by the invention is as follows:
a method for improving anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment comprises the following steps:
(1) Taking the residual sludge from a mixed sludge return well of a secondary sedimentation tank of an urban sewage treatment plant, and standing;
(2) Throwing persulfate into the sludge after standing in the step (1) for pretreatment, and then carrying out ultrasonic pretreatment;
(3) Adding the excess sludge pretreated in the step (2) and the sewer bottom sludge into a reaction container according to the inoculation volume ratio of the excess sludge to the sewer bottom sludge of 6-8;
(4) The reaction vessel is sealed and placed into a water bath constant temperature oscillator for culture.
Further, in the step (1), the standing time is 24 hours or longer, preferably 24 to 48 hours.
Further, in the step (2), the ultrasonic pretreatment time is 30-50 min, and the addition amount of persulfate is 1.6-1.9 mmol/g VSS (VSS represents volatile suspended solid).
Further, in the step (4), introducing nitrogen into the reaction container for 2-3min, and sealing the bottle opening by using a rubber plug to remove air in the reaction container so as to keep a good anaerobic environment.
Further, in the step (4), the temperature of the culture is 35 to 38 ℃, and the time of the culture is more than 21 days, preferably 21 to 30 days; the stirring speed of the water bath constant temperature oscillator is 120-180 rpm; the stirring speed of more than 120rpm/min can realize repeated uniform stirring effect, and when the stirring speed exceeds 180rpm/min, the methane production promoting effect is reduced because the methane production process of active bacteria is influenced.
Further, in step (4), the water in the water bath is supplemented by municipal tap water to prevent the water in the water bath constant temperature oscillator from being reduced due to evaporation.
The method utilizes ultrasonic persulfate to carry out combined pretreatment on the excess sludge for anaerobic digestion, improves the anaerobic digestion efficiency, greatly improves the yield of methane in the anaerobic digestion process, and provides a new idea for solving the problem of sludge treatment in China.
Compared with the prior art, the invention has the following beneficial effects:
1) According to the invention, the ultrasonic persulfate combined pretreatment technology is utilized, and the persulfate is activated by ultrasonic waves, so that the yield of methane in the anaerobic digestion process of excess sludge is greatly increased by the synergistic effect of the two pretreatment technologies;
2) In the prior art, such as an acid-base method, a heat treatment method, an advanced oxidation method and a combined treatment method, the pretreatment time is long, the operation flow is complex, and more importantly, a large amount of exogenous chemical substances are required to be added or a large amount of energy is consumed, so that the treatment cost of sludge is greatly increased. The method has high efficiency of treating the anaerobic digestion sludge, is simple to operate, and obviously improves the treatment efficiency and the application prospect of the excess sludge.
Drawings
FIG. 1 is a graph of cumulative methane production over time for examples 1-3 and comparative examples.
Detailed Description
The present invention is further described with reference to specific embodiments, but the scope of the present invention is not limited thereto.
The following example employed excess sludge from a sewage treatment plant having a design daily capacity of 20 ten thousand tons and a process flow of a coarse grid, a sludge inlet pump house, a fine grid and an aerated grit chamber-A, the sludge being taken from a secondary sedimentation basin sludge recirculation well in the plant area 2 O-process biological reaction tank and return sludge pump roomA secondary sedimentation tank, an ultraviolet disinfection tank and a water outlet pump room. In order to keep the components of the sludge unchanged, the withdrawn sludge was left to stand at 4 ℃ for 24 hours.
Example 1
(1) 700mL of excess sludge subjected to ultrasonic pretreatment for 40min is added into a conical flask with the working volume of 1000mL, and then 100mL of uniform and impurity-free sewer bottom sludge is added;
(2) After stirring evenly, nitrogen is filled into the reactor for 2-3min to completely discharge oxygen in the reactor, the bottle mouth of the rubber plug is sealed, and the reactor is placed in a water bath constant temperature oscillator for anaerobic digestion. Under the action of various anaerobic and facultative microorganisms, organic matters in the sludge are converted into methane. In the anaerobic digestion process, the stirring speed of the oscillator is controlled to be 120rpm, the fermentation temperature of the reactor is 37 ℃, the digestion reaction time is 21d, and the yield of produced methane is 278mL.
Example 2
(1) Adding 700mL of pretreated excess sludge with the persulfate addition amount of 1.8mmol/g VSS into a conical flask with the working volume of 1000mL, and then adding 100mL of uniform and impurity-free sewer bottom sludge;
(2) After stirring evenly, nitrogen is filled into the reactor for 2-3min to completely discharge oxygen in the reactor, the bottle mouth of the rubber plug is sealed, and the reactor is placed in a water bath constant temperature oscillator for anaerobic digestion. Under the action of various anaerobic and facultative microorganisms, organic matters in the sludge are converted into methane. During anaerobic digestion, the stirring speed of the oscillator is controlled to be 120rpm, the fermentation temperature of the reactor is controlled to be 37 ℃, the digestion reaction time is controlled to be 21d, and the yield of produced methane is 565mL.
Example 3
(1) After 1.8mmol/g VSS persulfate is added for pretreatment, 700mL of excess sludge subjected to ultrasonic pretreatment for 40min is added into a conical flask with the working volume of 1000mL, and then 100mL of uniform and impurity-free sewer bottom sludge is added;
(2) After stirring evenly, nitrogen is filled into the reactor for 2-3min to completely discharge oxygen in the reactor, the bottle mouth of the rubber plug is sealed, and the reactor is placed in a water bath constant temperature oscillator for anaerobic digestion. Under the action of various anaerobic and facultative microorganisms, organic matters in the sludge are converted into methane. In the anaerobic digestion process, the stirring speed of the oscillator is controlled to be 120rpm, the fermentation temperature of the reactor is 37 ℃, the digestion reaction time is 21d, and the yield of produced methane is 658mL.
Comparative example
(1) Adding 700mL of raw sludge into a conical flask with the working volume of 1000mL, and then adding 100mL of uniform and impurity-free sewer bottom sludge;
(2) After stirring evenly, nitrogen is filled into the reactor for 2-3min to completely discharge oxygen in the reactor, the bottle mouth of the rubber plug is sealed, and the reactor is placed in a water bath constant temperature oscillator for anaerobic digestion. Under the action of various anaerobic and facultative microorganisms, organic matters in the sludge are converted into methane. In the anaerobic digestion process, the stirring speed of the oscillator is controlled to be 120rpm, the fermentation temperature of the reactor is 37 ℃, the digestion reaction time is 21d, and the yield of the produced methane is 150mL.
The methane yields of examples 1-3 and comparative examples are shown in table 1.
TABLE 1 methane production for examples 1-3 and comparative examples
As can be seen from Table 1, the methane production in examples 1-3 was significantly improved over that of the comparative example, and the cumulative methane production in 21 days was 278mL, 565mL, and 658mL for the ultrasonic, persulfate, and ultrasonic + persulfate groups, respectively, which were 1.9 times, 3.8 times, and 4.4 times that of the comparative example (150 mL), that is, the ultrasonic-persulfate combination pretreatment was most effective in promoting anaerobic digestion of sludge to produce methane.
Claims (7)
1. The method for improving anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment is characterized by comprising the following steps:
(1) Taking the excess sludge for standing;
(2) Throwing persulfate into the sludge after standing in the step (1) for pretreatment, and then carrying out ultrasonic pretreatment;
(3) Adding the excess sludge pretreated in the step (2) and the sewer bottom sludge into a reaction container according to the inoculation volume ratio of the excess sludge to the sewer bottom sludge of 6-8;
(4) The reaction vessel is sealed and placed into a water bath constant temperature oscillator for culture.
2. The method for improving the methane production through anaerobic digestion of sludge by using the ultrasonic persulfate pretreatment of the sewage persulfate as claimed in claim 1, wherein the excess sludge is taken from a mixed sludge return well of a secondary sedimentation tank of a municipal sewage treatment plant.
3. The method for improving the anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment according to claim 1, wherein the standing time in the step (1) is 24-48 hours.
4. The method for improving anaerobic digestion of sludge to produce methane by using ultrasonic persulfate pretreatment according to claim 1, wherein in the step (2), the adding amount of persulfate is 1.6-1.9 mmol/g VSS, and the ultrasonic pretreatment time is 30-50 min.
5. The method for improving the anaerobic digestion methane production of sludge by utilizing ultrasonic persulfate pretreatment according to claim 1, wherein in the step (4), nitrogen is introduced into the reaction container for 2-3min, and a bottle opening is sealed by a rubber plug so as to remove air in the reaction container and keep a good anaerobic environment.
6. The method for improving anaerobic digestion of sludge to produce methane by ultrasonic persulfate pretreatment according to claim 1, wherein in the step (4), the culture temperature is 35-38 ℃, and the culture time is 21-30 days; the stirring speed of the water bath constant temperature oscillator is 120-180 rpm.
7. The method for improving the methane production through the anaerobic digestion of sludge by using the ultrasonic persulfate pretreatment as claimed in claim 1, wherein in the step (4), the water in the water bath is supplemented by municipal tap water so as to prevent the water in the thermostatic oscillator of the water bath from being reduced due to evaporation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117228917A (en) * | 2023-10-25 | 2023-12-15 | 同济大学 | Method for realizing enrichment of methane-producing functional flora by anaerobic digestion through pretreatment-hydrothermal carbon regulation and control |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529106A (en) * | 2015-01-01 | 2015-04-22 | 北京工业大学 | Method for promoting anaerobic digestion of excess sludge through copper sulfate to produce methane |
| CN114394725A (en) * | 2022-01-17 | 2022-04-26 | 同济大学 | Method for improving anaerobic digestion of sludge to produce methane by combination of freezing and calcium hypochlorite |
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- 2022-08-30 CN CN202211049261.3A patent/CN115611489A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529106A (en) * | 2015-01-01 | 2015-04-22 | 北京工业大学 | Method for promoting anaerobic digestion of excess sludge through copper sulfate to produce methane |
| CN114394725A (en) * | 2022-01-17 | 2022-04-26 | 同济大学 | Method for improving anaerobic digestion of sludge to produce methane by combination of freezing and calcium hypochlorite |
Non-Patent Citations (1)
| Title |
|---|
| 周世暄: ""超声/过硫酸盐预处理技术对污泥脱水以及厌氧消化的影响"", 中国优秀硕士学位论文全文数据库 工程科技I辑, no. 3, 15 March 2022 (2022-03-15), pages 027 - 1191 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117228917A (en) * | 2023-10-25 | 2023-12-15 | 同济大学 | Method for realizing enrichment of methane-producing functional flora by anaerobic digestion through pretreatment-hydrothermal carbon regulation and control |
| CN117228917B (en) * | 2023-10-25 | 2024-02-09 | 同济大学 | Method for realizing enrichment of methane-producing functional flora by anaerobic digestion through pretreatment-hydrothermal carbon regulation and control |
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