CN109279746A - A kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down - Google Patents
A kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down Download PDFInfo
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- CN109279746A CN109279746A CN201811423974.5A CN201811423974A CN109279746A CN 109279746 A CN109279746 A CN 109279746A CN 201811423974 A CN201811423974 A CN 201811423974A CN 109279746 A CN109279746 A CN 109279746A
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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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- 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
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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
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a kind of synchronous methods for improving sludge anaerobic methane phase and resistant gene and cutting down, it is characterized in that, sewage is after Anaerobic Treatment, Aerobic Process for Treatment is carried out under Zero-valent Iron effect, it is reacted under aeration condition, improves the treatment effeciency of sewage, the content of antibiotic in reduction system, the enriching quantity of resistant gene is reduced, and the EPS content of sludge is reduced；Then it is heavy that two are carried out, wherein iron content excess sludge is concentrated using gravitational settling；Sludge after concentration is first preheated, then carries out hydro-thermal reaction；Reaction terminates, and after the cooling of hydro-thermal mixed liquor, hydro-thermal mixed liquor is added and carries out thermophilic digestion into anaerobic digester system.The present invention makes the reduction of sludge extracellular polymeric content, realize the reduction of resistant gene in sludge, sludge anaerobic digestion system is added in hydro-thermal liquid, the iron-bearing water hydrothermal solution of high content of organics facilitates the further reduction removal of the anaerobic digestion methane phase and resistant gene of sludge.
Description
Technical field
The present invention relates to a kind of synchronous methods for improving sludge anaerobic methane phase and resistant gene and cutting down, and belong to environmental protection technology
Field.
Background technique
Antibiotic is widely used as the growth rush for preventing and treating drug and animal of human and animal's communicable disease
Into agent.In recent years, a large amount of use of antibiotic causes resistant microorganism to be largely proliferated and the enrichment and propagation of resistant gene, research
Show that resistant gene is generally existing in water body environment, constituted a serious threat to human health, antibiotics resistance gene is gone
It removes and cuts down very urgent.Sewage treatment plant receives the resistant gene (ARGs) of each discharge of pollutant sources, and is arranged by different approaches
It is put into natural water and soil, is the important repository and emission source of main resistant gene in environment, while being also abatement
The important channel of resistant gene.Activated sludge in sewage treatment plant is important place existing for resistant gene, at certain sewage
Manage the level of pollution result of study table of factory's resistant gene (tet A, tet C, tet E, tet M, tet O, tet W and sul I)
Bright, resistant gene detects frequency highest (0.86) (Water Res, 2007,41 (5): 1143-1151) in activated sludge.It is anti-
Property gene in the disposal process of excess sludge may enter environment in, serious prestige is caused to ecological environment and human health
The side of body.Therefore, it is imperative efficiently to cut down resistant gene in sludge.
Important technology of the anaerobic fermentation as sludge treatment can not only solve caused by the growing sludge of yield
Environmental problem, and the energy supply and demand contradiction of current growing tension can be alleviated, it can additionally cut down in sludge to a certain extent
Resistant gene.However, the content of organic matter is relatively low in China's sludge, C/N is than low, biodegradability is poor, sludge anaerobic
The removal rate of gas production and volatile solid content (VS) is all lower when fermentation, and the antibiotic carried in sludge can inhibit sludge
Anaerobic fermentation efficiency.Some researchers have reported that when Amoxicillin concentration is 60mg/L and 120mg/L, piggery wastewater anaerobism hair
After ferment 150h, methane phase rate be respectively control 75% and 68% (Bioresource Technology, 2002,82:205-
208).Therefore, it if the enrichment content of antibiotic resistant gene in the concentration and sludge in sludge can be reduced, and improves simultaneously
The content of organic matter of sludge fermentation process, and the removal of antibiotic is improved simultaneously, the important channel of excess sludge processing will be become.
High temperature and pressure hydrothermal pretreatment can reduce the antibiotic in sludge, and can pass through the cell wall for destroying microorganism,
Organic matter intracellular is discharged, so that insoluble organic matter is converted into dissolved organic matter and greatly shortens hydrolytic process, to accelerate dirt
The hydrolysis acidification of mud produces gas, improves the efficiency of excess sludge producing methane through anaerobic fermentation.It can effectively cut down in sludge simultaneously
Resistant gene, to prevent it further to Environmental diffusion.
Summary of the invention
Problem to be solved by this invention is: how to synchronize and improves sludge anaerobic methane phase and resistant gene reduction.
To solve the above-mentioned problems, the invention adopts the following technical scheme:
A kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down, which is characterized in that including following step
It is rapid:
Step 1): sewage carries out Aerobic Process for Treatment under Zero-valent Iron effect, reacts under aeration condition after Anaerobic Treatment,
The treatment effeciency of sewage is improved, the content of antibiotic, reduces the enriching quantity of resistant gene, and the EPS of sludge contains in reduction system
Amount is reduced；
Step 2): and then carry out two and sink, wherein iron content excess sludge is concentrated using gravitational settling；
Step 3): the sludge after concentration is first preheated, then carries out hydro-thermal reaction；Mud organic substance after hydrothermal pretreatment
Burst size improve, the sewage disposal system excess sludge hydro-thermal of Zero-valent Iron is relatively not added and is pre-processed with condition, is dissolved in hydro-thermal liquid
Property organic matter (SCOD) content improve 10~35%, dissolution protein content improve 10~30%, dissolubility sugared content improve 15
~35%.
Step 4): reaction terminates, and after the cooling of hydro-thermal mixed liquor, hydro-thermal mixed liquor is added and is carried out into anaerobic digester system
Thermophilic digestion.
Preferably, using biochemical wastewater treatment system, the Anaerobic Treatment in the step 1) carries out in anaerobic pond, aerobic
Processing carries out in aerobic tank, is back to anaerobic pond in the nitrification liquid of aerobic tank water outlet and carries out denitrification denitrogenation processing, the step
It is rapid 2) in two sink in secondary settling tank and carry out, gravitational settling is concentrated in sludge concentration tank and carries out, the preheating in the step 3)
It is carried out in preheating reactor tank, hydro-thermal reaction carries out in hydro-thermal reaction tank, and the thermophilic digestion in the step 4) is being detested
It is carried out in aerobe fermentation tank.
Preferably, the source of Zero-valent Iron be lathe cut waste material length is 5~10 using iron plane flower in the step 1)
Centimetre and the industrial iron filings of helical buckling shape remove its table with the soaking with sodium hydroxide of 0.2M before use, iron plane is spent clean
Face grease stain.
It is highly preferred that the dosage of the iron plane flower is 20~100g/L, after adding, the COD degradation rate of sewage improves 15
~50%, nitrogen removal rate improves 25~50%, and the antibiotic content in sludge reduces 30~80%, and the enrichment of resistant gene contains
Amount reduces 5-100 times.
Preferably, the concentration of sludge is 15~25g/L after concentration in the step 2), the iron-content of sludge is 150~
300mg/g TSS, sludge EPS reduce 15~50%, and the supernatant that concentration process generates is emitted into anaerobic pond.
It is highly preferred that the preheating reactor tank is heated to 60~80 DEG C, preheating time is 0.5~5h；The hydro-thermal reaction
Tank is heated to 140~200 DEG C, and heating time is 60~180min, and heating method is added using steam heating, heat-conducting oil heating or electricity
Hot mode；The injection rate of sludge is react tank volume 40%~85% in preheating reactor tank, hydro-thermal reaction tank.
Preferably, after hydro-thermal mixed liquor is cooled to 50~70 DEG C in the step 4), with the mixed liquor in anaerobic digestor
After 0.3~2:1 mixing by volume, under the conditions of 55 DEG C, 10~30d is reacted in anaerobic digestion；Reaction terminates, and methane production improves
20~60%, the reduction efficiency of resistant gene improves 20-60%.In figure, pleasure that the water outlet of secondary settling tank, sludge concentration tank all returns
Anaerobic pond, there are also the parts of interior reflux, please illustrate
The processing of Zero-valent Iron enhanced biological is added in the present invention in activated Sludge System, improves the nitric efficiency of sewage, reduces
The enrichment of the concentration of antibiotic and resistant gene in sludge in system, and make the reduction of sludge extracellular polymeric content, it recycles
High temperature and pressure hydro-thermal process excess sludge, realizes the reduction of resistant gene in sludge, and keeps the microorganism wall in sludge broken
It splits, releases organic matter, sludge anaerobic digestion system is added in hydro-thermal liquid, the iron-bearing water hydrothermal solution of high content of organics facilitates dirt
The further reduction removal of the anaerobic digestion methane phase and resistant gene of mud.
Compared with prior art, the invention has the following beneficial effects:
(1) this method can reduce sewage disposal system by adding economical and easily available Zero-valent Iron in biochemical treatment aerobic section
In antibiotic content and sludge in resistant gene enrichment, from source reduce sludge in antibiotic content.
(2) the characteristics of this method can reduce sludge EPS content using Zero-valent Iron, makes the cell of water-heat process sludge microbe
More cracky to improve the content of organic matter in hydro-thermal liquid, and can strengthen the reduction of water-heat process resistant gene.
(3) this method is added using the iron-bearing water hot mixing liquid of high content of organics to sludge high temperature anaerobic fermentation system,
The further reduction for improving methane production and resistant gene can be synchronized.
Detailed description of the invention
Fig. 1 is the synchronous process flow for improving the method that sludge anaerobic methane phase and resistant gene are cut down provided by the invention
Figure.
Specific embodiment
In order to make the present invention more obvious and understandable, hereby with preferred embodiment, and attached drawing is cooperated to be described in detail below.
Embodiment
A kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down:
(1) iron plane flower is added in the aerobic tank in sewage disposal system, the throwing amount of iron plane flower is 50g/L, and iron plane is added
The COD removal rate of colored sewage improves 30% than blank group, and nitrogen removal rate improves 25%, such as to the micro antibiotic in sewage
The removal rate of tetracycline improves 50%, and the enriching quantity of tetracycline resistance gene reduces 10 times compared with the system that Zero-valent Iron is not added；
(2) excess sludge of secondary settling tank is concentrated into sludge concentration by concentration basin is 18g/L, and the EPS of sludge is compared with blank
Group reduces 30%；
(3) by the sludge pumping after concentration to reactor tank is preheated, the pre-heat treatment, preheating temperature are carried out using steam heating method
Degree is 60 DEG C, pretreatment time 2h.Sludge after preheating is injected in high-pressure sealed reactor tank, the injection rate of sludge is reaction
The 55% of tank volume, using steam heating method, sludge temperature is 160 DEG C in airtight heating to tank, keeps 120min；
(4) about 55 DEG C, after mixing after cooling with the sludge in anaerobic digestor with the volume ratio of 1:1 are cooled to, at 55 DEG C
Under the conditions of anaerobic digestion 20d, methane production improves 40% compared with the direct anaerobism of ordinary activated sludge.After processed by the invention, portion
The reduction effect of ARGs is divided to be shown in Table 1.
1 ordinary activated sludge anaerobic digestion of table and the reduction of the ARGs through anaerobic digestion of the present invention comparison
Embodiment 2
A kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down:
(1) iron plane flower is added in the aerobic tank in sewage disposal system, the throwing amount of iron plane flower is 70g/L, and iron plane is added
The COD removal rate of colored sewage improves 32% than blank group, and nitrogen removal rate improves 30%；Such as to the micro antibiotic in sewage
The removal rate of sulfamido improves 50%, and the enriching quantity of sulfamido resistant gene reduces 20 times compared with the system that Zero-valent Iron is not added；
(2) excess sludge of secondary settling tank is concentrated into sludge concentration by concentration basin is 22g/L, and the EPS of sludge is compared with blank
Group reduces 30%；
(3) by the sludge pumping after concentration to reactor tank is preheated, the pre-heat treatment, preheating temperature are carried out using steam heating method
Degree is 70 DEG C, pretreatment time 3h.By treated, sludge injects in high-pressure sealed reactor tank, and the injection rate of sludge is reaction
The 55% of tank volume, using steam heating method, sludge temperature is 150 DEG C in airtight heating to tank, keeps 180min；
(4) be cooled to 60 DEG C hereinafter, cooling after hydro-thermal mixed liquor and anaerobic digestor in sludge with the volume of 0.5:1
After mixing, send that anaerobic digestion 15d, methane production are mentioned compared with the direct anaerobism of ordinary activated sludge under the conditions of 55 DEG C to anaerobic fermentation
It is high by 35%.After processed by the invention, the reduction effect of part ARGs is shown in Table 1.
1 ordinary activated sludge anaerobic digestion of table and the reduction of the ARGs through anaerobic digestion of the present invention comparison
Claims (7)
1. a kind of synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down, which comprises the following steps:
Step 1): sewage carries out Aerobic Process for Treatment under Zero-valent Iron effect, reacts under aeration condition, improve after Anaerobic Treatment
The treatment effeciency of sewage, the content of antibiotic, reduces the enriching quantity of resistant gene, and the EPS content of sludge subtracts in reduction system
It is few；
Step 2): and then carry out two and sink, wherein iron content excess sludge is concentrated using gravitational settling；
Step 3): the sludge after concentration is first preheated, then carries out hydro-thermal reaction；
Step 4): reaction terminates, and after the cooling of hydro-thermal mixed liquor, hydro-thermal mixed liquor is added and carries out high temperature into anaerobic digester system
Anaerobic digestion.
2. the synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down as described in claim 1, which is characterized in that
Using biochemical wastewater treatment system, the Anaerobic Treatment in the step 1) carries out in anaerobic pond, and Aerobic Process for Treatment is in aerobic tank
It carries out, anaerobic pond is back in the nitrification liquid of aerobic tank water outlet and carries out denitrification denitrogenation processing, two in the step 2) sink to
It is carried out in secondary settling tank, gravitational settling is concentrated in sludge concentration tank and carries out, and the preheating in the step 3) is in preheating reactor tank
It carries out, hydro-thermal reaction carries out in hydro-thermal reaction tank, and the thermophilic digestion in the step 4) carries out in anaerobic fermentation tank.
3. the synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down as described in claim 1, which is characterized in that
The source of Zero-valent Iron be lathe cut waste material length is 5~10 centimetres and helical buckling using iron plane flower in the step 1)
The industrial iron filings of shape remove its surface grease stain with the soaking with sodium hydroxide of 0.2M before use, iron plane is spent clean.
4. the synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down as claimed in claim 3, which is characterized in that
The dosage of the iron plane flower is 20~100g/L, and after adding, the COD degradation rate of sewage improves 15~50%, nitrogen removal rate
25~50% are improved, the antibiotic content in sludge reduces 30~80%, and the enrichment content of resistant gene reduces 5-100 times.
5. the synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down as described in claim 1, which is characterized in that
The concentration of sludge is 15~25g/L after concentration in the step 2), and the iron-content of sludge is 150~300mg/g TSS, sludge
EPS reduces 15~50%, and the supernatant that concentration process generates is emitted into anaerobic pond.
6. the synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down as claimed in claim 2, which is characterized in that
The preheating reactor tank is heated to 60~80 DEG C, and preheating time is 0.5~5h；The hydro-thermal reaction tank is heated to 140~200
DEG C, heating time is 60~180min, and heating method is using steam heating, heat-conducting oil heating or Electric heating；Pre- thermal response
The injection rate of sludge is react tank volume 40%~85% in tank, hydro-thermal reaction tank.
7. the synchronous method for improving sludge anaerobic methane phase and resistant gene and cutting down as described in claim 1, which is characterized in that
After hydro-thermal mixed liquor is cooled to 50~70 DEG C in the step 4), with the 0.3~2:1 by volume of the mixed liquor in anaerobic digestor
After mixing, under the conditions of 55 DEG C, 10~30d is reacted in anaerobic digestion；Reaction terminates, and methane production improves 20~60%, resistance base
The reduction efficiency of cause improves 20-60%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110776081A (en) * | 2019-10-23 | 2020-02-11 | 农业部沼气科学研究所 | Method for removing antibiotic resistance genes in livestock and poultry wastewater |
| CN113636733A (en) * | 2021-08-23 | 2021-11-12 | 宁波财经学院 | Ozone promotes sludge digestion device |
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| CN103771671A (en) * | 2012-10-24 | 2014-05-07 | 中国石油化工股份有限公司 | Excess sludge treatment method |
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| CN110776081A (en) * | 2019-10-23 | 2020-02-11 | 农业部沼气科学研究所 | Method for removing antibiotic resistance genes in livestock and poultry wastewater |
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