CN102603142A - Method for producing biogas by aid of intensified anaerobic fermentation of pretreated circular backflow sludge - Google Patents
Method for producing biogas by aid of intensified anaerobic fermentation of pretreated circular backflow sludge Download PDFInfo
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Abstract
The invention belongs to the technical field of solid waste reclamation, and discloses a method for producing biogas by the aid of intensified anaerobic fermentation of pretreated circular backflow sludge. The method includes steps: preparing concentrated sludge and dewatered sludge into mixed sludge; taking the mixed sludge as a fed material for anaerobic digestion; discharging sludge with the same volume; simultaneously, repeatedly carrying out anaerobic digestion after the backflow sludge is pretreated; and collecting the biogas. By the aid of the method, total gas yield by the aid of anaerobic digestion of the sludge is increased, the retention time of the sludge is shortened, and the volume of a sludge anaerobic fermentation tank is reduced.
Description
Technical field
The invention belongs to the solid waste resource recovery technical field, relate to the method that a kind of pre-treatment pump around circuit mud reinforced anaerobic fermentation produces biogas.
Background technology
China has built large amount of sewage treatment plant, and by 2009, the whole nation had 1792 of urban wastewater treatment firms, and processing power reaches 9,904 ten thousand m
3/ d, average operating load rate is 81.27%.When vital role had been played in the reduction that the construction and the operation of these sewage works are loaded to municipal pollution, by product municipal sludge amount also increased day by day in the sewage treatment process.At present, wet mud nearly 3,000 ten thousand tons (water ratio 80%) is produced in the whole nation per year, and the center that sludge treatment is disposed has turned to resource from simple landfill and turned to main soil utilization.And before mud carries out the soil utilization, need carry out stabilization treatment to mud; Reclaim a large amount of biomass energy that contains in the mud; Anaerobic digestion is one of important measures of sludge stabilizing; Not only process institute energy requirement is lower, and biomass energy in the also recyclable mud is a kind of recycling sludge technology that application prospect is arranged very much.
Traditional anaerobic digestion process is owing to have a sluggish, sludge retention time long (30～40 days), the pond body bulk is huge, methane production low with shortcoming such as sludge degradation degree difference, limited the performance of anaerobic digestion techniques advantage.In recent years, Chinese scholars takes in from how strengthening the pretreatment process equal angles the research that improves anaerobic sludge digestion recovery biomass energy is many, and the improvement of anaerobic ferment process is not obtained paying close attention to.
Summary of the invention
Few to China's sludge anaerobic fermentation to produce tolerance, aerogenesis is unstable; Be difficult to use the anaerobism stabilization process to its defective of handling; The method that the purpose of this invention is to provide a kind of pre-treatment pump around circuit mud reinforced anaerobic fermentation gas; This method improves the sludge anaerobic digestion gas production total amount, has shortened sludge retention time.
Technical scheme of the present invention is following:
The invention provides the method that a kind of pre-treatment pump around circuit mud reinforced anaerobic fermentation produces biogas, this method may further comprise the steps:
Thickened sludge and dewatered sludge are made into mixing sludge, get above-mentioned mixing sludge and carry out anaerobic digestion as charging, and the mud of discharging equal volume, returned sluge is after pre-treatment simultaneously, and anaerobic digestion is carried out in recycling, collects biogas.
Described mixing sludge water ratio is 88～98%.
The reflux ratio of described returned sluge is 5～10%.
Described charging or discharging are meant inlet amount every day=every day load=digested sludge total amount/sludge retention time.
Sludge retention time is 20～30d in the described anaerobic digestion process.
Described pre-treatment is alkaline hydrolysis pre-treatment, heat pre-treatment or Microwave Pretreatment.
Described alkaline hydrolysis pre-treatment is meant through adding alkaline reagents, makes mud be under the alkaline condition and stirs 1～6h reaching the purpose that alkalescence cracks, and before anaerobic digestion once more, adding hydrochloric acid and regulate pH to 7.5 ± 0.5.
Described alkaline reagents is sodium hydroxide (NaOH), unslaked lime (CaO) or calcium hydroxide (Ca (OH)
2), it is 0.05～0.15g that every gram volatility organic solid VS adds alkaline reagents, i.e. 0.05～0.15g/g VS.
Described heat pre-treatment temperature is 90～170 ℃, and the time is 10～60min.
Described Microwave Pretreatment process conditions is: microwave frequency is 2450MHz, and microwave irradiation power is 100～1000w, and radiated time is 1～20min.
Described anaerobic digestion controlled temperature is 35 ± 2 ℃ or 55 ± 2 ℃, and regulating pH is 7.5 ± 0.5, and stirring velocity is 30～250rpm.
The present invention compares with prior art, has the following advantages and beneficial effect:
1, the inventive method improves the sludge anaerobic fermenting organism mass-energy recovery, stablizes gas production rate, and convenient in application further promotes recycling sludge.
2, the inventive method increases alkaline hydrolysis cycle of treatment returned sluge system, has both strengthened the mixed effect of fermentation system, has strengthened the dissolving of solid organic matters again, makes the operation of reactor drum efficient stable.
3, the inventive method has improved the sludge anaerobic digestion gas production total amount, has shortened sludge retention time, has reduced sludge anaerobic fermentor tank volume.
4, backflow utilized after the inventive method can realize the grog intensified process, for organism of fermentation provides abundant organic substrates, improved sludge anaerobic fermentation methane turnout, shortened the anaerobically fermenting cycle.
Description of drawings
Fig. 1 representes that alkaline hydrolysis pre-treatment pump around circuit mud reinforced anaerobic fermentation of the present invention produces the schema of the method for biogas.
Fig. 2 representes that heat pre-treatment pump around circuit mud reinforced anaerobic fermentation of the present invention produces the schema of the method for biogas.
Fig. 3 representes that Microwave Pretreatment pump around circuit mud reinforced anaerobic fermentation of the present invention produces the schema of the method for biogas.
Embodiment
Below in conjunction with the accompanying drawing illustrated embodiment the present invention is further described.
Embodiment 1
Fig. 1 representes that alkaline hydrolysis cycle of treatment returned sluge reinforced anaerobic fermentation of the present invention produces the schema of the method for biogas.
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 92%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into the 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, add NaOH through in gravity reflux 1L (reflux ratio is 5%) ripe mud to the alkaline hydrolysis setting device every day under the agitation condition of 120rpm, and the NaOH dosage is 0.05g/gVS.Add hydrochloric acid behind the reaction 2h and regulate pH to 7.5, pump in the fermentor tank through the recycle feed mouth through sludge circulation pump again.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 100rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 12～13L, and methane content is 65.2%, and degradation effect of organic compound is 35%.Comparative example 1
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 92%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into the 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging simultaneously is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 100rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 10～11L, and methane content is 62.3%, and degradation effect of organic compound is 28%.
This shows that embodiment 1 compares comparative example 1 average daily gas production rate and improved 182～20%, degradation effect of organic compound has increased 7%.
Embodiment 2
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 98%, and VS/TS is 0.75 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into the 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, to the alkaline hydrolysis setting device, add CaO through the ripe mud of gravity reflux 4L (reflux ratio is 6.7%) every day under the agitation condition of 120rpm, and the CaO dosage is 0.010g/gVS.Add hydrochloric acid behind the reaction 6h and regulate pH to 7.5, pump in the fermentor tank through the recycle feed mouth through sludge circulation pump again.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 50rpm.Continuously operation 2～3 cycles (promptly after 60～90d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 11.0～12.0L, and methane content is 67.4%, and degradation effect of organic compound is 45%.
Comparative example 2
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 98%, and VS/TS is 0.75 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into the 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging simultaneously is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 50rpm.Continuously operation 2～3 cycles (promptly after 60～90d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 9.0～10.0L, and methane content is 63.6%, and degradation effect of organic compound is 36%.
This shows that embodiment 2 compares comparative example 2 average daily gas production rate and improved 20.0～33.3%, degradation effect of organic compound has increased 9%.
Embodiment 3
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 88%, and VS/TS is 0.33 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 800mL drops into the 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, to the alkaline hydrolysis setting device, add Ca (OH) through the ripe mud of gravity reflux 2L (reflux ratio is 10%) every day under the agitation condition of 120rpm
2, Ca (OH)
2Dosage is 0.15g/gVS.Add hydrochloric acid behind the reaction 4h and regulate pH to 7.5, pump in the fermentor tank through the recycle feed mouth through sludge circulation pump again.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 10～11L, and methane content is 66.3%, and degradation effect of organic compound is 31%.
Comparative example 3
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 88%, and VS/TS is 0.33 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 800mL drops into the 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging simultaneously is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 8～9L, and methane content is 63.3%, and degradation effect of organic compound is 22%.
This shows that embodiment 3 compares comparative example 3 average daily gas production rate and improved 22.2～25.0%, degradation effect of organic compound has increased 9%.
Embodiment 4
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 94%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into the 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, to the alkaline hydrolysis setting device, add NaOH through the ripe mud of gravity reflux 3L (reflux ratio is 7.5%) every day under the agitation condition of 120rpm, and the NaOH dosage is 0.08g/gVS.Add hydrochloric acid behind the reaction 4h and regulate pH to 7.5, pump in the fermentor tank through the recycle feed mouth through sludge circulation pump again.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 53.4～80.1d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 15～16L, and methane content is 65.5%, and degradation effect of organic compound is 38%.
Comparative example 4
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 94%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into the 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging simultaneously is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 53.4～80.1d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 12～13L, and methane content is 61.2%, and degradation effect of organic compound is 31%.
This shows that embodiment 4 compares comparative example 4 average daily gas production rate and improved 23.1～25.0%, degradation effect of organic compound has increased 7%.
Embodiment 5
Fig. 2 representes that heat pre-treatment pump around circuit mud reinforced anaerobic fermentation of the present invention produces the schema of the method for biogas.
Somewhere sewage work thickened sludge and dewatered sludge are made into water ratio in the mud preparing pool be 92%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into the 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition,, to heating pretreatment device through 120 degree heating 30mins after through sludge circulation pump through recycle feed mouth pump in fermentor tank through gravity reflux 1L mud (reflux ratio is 5%) every day.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 100rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 13～14L, and methane content is 65.3, and degradation effect of organic compound is 36%.
Embodiment 5 relatively example 1 average daily gas production rate has improved 27.3～30.0%, and degradation effect of organic compound has increased 7%.
Embodiment 6
Somewhere sewage work thickened sludge and dewatered sludge are made into water ratio in the mud preparing pool be 98%, and VS/TS is 0.75 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into the 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition,, to heating pretreatment device through 90 ℃ heating 60min after through sludge circulation pump through recycle feed mouth pump in fermentor tank through gravity reflux 4L mud (reflux ratio is 6.7%) every day.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 50rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily aerogenesis 14.0～15.0L, and methane content is 65.3%, degradation effect of organic compound is 46%.
Embodiment 6 relatively example 2 average daily gas production rate has improved 50.5～55.6%, and degradation effect of organic compound has increased 10%.
Embodiment 7
It is 88% that somewhere sewage work thickened sludge and dewatered sludge are made into water ratio at the mud preparing pool, and VS/TS is 0.33 anaerobically digested sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned excess sludge of 800mL drops into the 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition,, to heating pretreatment device through 170 degree heating 10mins after through sludge circulation pump through recycle feed mouth pump in fermentor tank through gravity reflux 2L mud (reflux ratio is 10%) every day.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 12～13L, and methane content is 64.7%, and degradation effect of organic compound is 33%.
Embodiment 7 relatively example 3 average daily gas production rate has improved 44.4～50.0%, and degradation effect of organic compound has increased 11%.
Embodiment 8
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 94%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into the 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition,, to heating pretreatment device through 120 degree heating 20mins after through sludge circulation pump through recycle feed mouth pump in fermentor tank through the ripe mud of gravity reflux 3L (reflux ratio is 7.5%) every day.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 53.4～80.1d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 16～17L, and methane content is 65.5%, and degradation effect of organic compound is 40%.
Embodiment 8 relatively example 4 average daily gas production rate has improved 30.8～33.3%, and degradation effect of organic compound has increased 8%.
Embodiment 9
Fig. 3 representes that Microwave Pretreatment pump around circuit mud reinforced anaerobic fermentation of the present invention produces the schema of the method for biogas.
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 92%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into the 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, every day, to microwave radiation device, microwave frequency was 2450MHz, behind microwave exposure 1min, is pumping in the fermentor tank through sludge circulation pump under the 1000W condition through the ripe mud of gravity reflux 1L (reflux ratio is 5%).Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 100rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 12.5～13.5L, and methane content is 64.3%, and degradation effect of organic compound is 35.5%.
Embodiment 9 relatively example 1 average daily gas production rate has improved 22.7～25.0%, and degradation effect of organic compound has increased 7.5%.
Embodiment 10
Somewhere sewage work thickened sludge and dewatered sludge are made into water ratio in the mud preparing pool be 98%, and VS/TS is 0.75 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into the 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, every day, extremely to microwave radiation device, microwave frequency was 2450MHz, under the 600W condition, pumps in the fermentor tank through sludge circulation pump behind the microwave exposure 4min through gravity reflux 4L mud (reflux ratio is 6.7%).Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 50rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily aerogenesis 12.0～13.0L, and methane content is 64.9%, degradation effect of organic compound is 45.5%.
Embodiment 10 relatively example 2 average daily gas production rate has improved 30.0～33.3%, and degradation effect of organic compound has increased 9.5%.
Embodiment 11
It is 88% that somewhere sewage work thickened sludge and dewatered sludge are made into water ratio at the mud preparing pool, and VS/TS is 0.33 anaerobically digested sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned excess sludge of 800mL drops into the 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, every day, to microwave radiation device, microwave frequency was 2450MHz, behind microwave exposure 5min, is pumping in the fermentor tank through sludge circulation pump under the 800W condition through gravity reflux 2L mud (reflux ratio is 10%).Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 11～12L, and methane content is 65.2%, and degradation effect of organic compound is 32%.
Embodiment 11 relatively example 3 average daily gas production rate has improved 33.3～37.5%, and degradation effect of organic compound has increased 10%.
Embodiment 12
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 94%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into the 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging simultaneously is to collecting in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, every day, to microwave radiation device, microwave frequency was 2450MHz, behind microwave exposure 20min, is pumping in the fermentor tank through sludge circulation pump under the 200W condition through the ripe mud of gravity reflux 3L (reflux ratio is 7.5%).Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 53.4～80.1d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 15.5～16.5L, and methane content is 66.5%, and degradation effect of organic compound is 39%.
Embodiment 12 relatively example 4 average daily gas production rate has improved 26.9～29.2%, and degradation effect of organic compound has increased 8%.
The above-mentioned description to embodiment is can understand and use the present invention for ease of the those of ordinary skill of this technical field.The personnel of skilled obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (10)
1. a pre-treatment pump around circuit mud reinforced anaerobic ferments and produces the method for biogas, and it is characterized in that: this method may further comprise the steps:
Thickened sludge and dewatered sludge are made into mixing sludge, get above-mentioned mixing sludge and carry out anaerobic digestion as charging, and the mud of discharging equal volume, returned sluge is after pre-treatment simultaneously, and anaerobic digestion is carried out in recycling, collects biogas.
2. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, and it is characterized in that: described mixing sludge water ratio is 88～98%, and the reflux ratio of described returned sluge is 5～10%.
3. pre-treatment pump around circuit mud reinforced anaerobic according to claim 1 fermentation produces the method for biogas, it is characterized in that: described charging or discharging are meant inlet amount every day=every day load=digested sludge total amount/sludge retention time.
4. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, and it is characterized in that: sludge retention time is 20～30d in the described anaerobic digestion process.
5. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, and it is characterized in that: described pre-treatment is alkaline hydrolysis pre-treatment, heat pre-treatment or Microwave Pretreatment.
6. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 5 produces the method for biogas; It is characterized in that: described alkaline hydrolysis pre-treatment is meant through adding alkaline reagents; Mud is in stirs 1～6h under the alkaline condition, and adding hydrochloric acid adjusting pH to 7.5 ± 0.5 before the anaerobic digestion once more..
7. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 6 produces the method for biogas; It is characterized in that: described alkaline reagents is sodium hydroxide, unslaked lime or calcium hydroxide; It is 0.05～0.15g that every gram volatility organic solid VS adds alkaline reagents, i.e. 0.05～0.15g/g VS.
8. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 5 produces the method for biogas, and it is characterized in that: described heat pre-treatment temperature is 90～170 ℃, and the time is 10～60min.
9. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 5 produces the method for biogas; It is characterized in that: described Microwave Pretreatment process conditions is: microwave frequency is 2450MHz; Microwave irradiation power is 100～1000w, and radiated time is 1～20min.
10. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, and it is characterized in that: described anaerobic digestion controlled temperature is 35 ± 2 ℃ or 55 ± 2 ℃, and regulating pH is 7.5 ± 0.5, and stirring velocity is 30～250rpm.
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| CN103214091A (en) * | 2013-03-07 | 2013-07-24 | 中国科学院生态环境研究中心 | Fountainhead sludge reduction process of backflow sludge alkali treatment acidifying |
| CN106676138A (en) * | 2017-01-19 | 2017-05-17 | 广西博世科环保科技股份有限公司 | Reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method |
| CN108383348A (en) * | 2018-04-11 | 2018-08-10 | 华南理工大学 | A kind of device and method of sludge high temperature anaerobic digestion producing methane |
| CN108751435A (en) * | 2018-07-19 | 2018-11-06 | 厦门润垣环保科技有限公司 | A kind of biological sludge anaerobic digester system |
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