CN102603142B - 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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- CN102603142B CN102603142B CN201210073253.2A CN201210073253A CN102603142B CN 102603142 B CN102603142 B CN 102603142B CN 201210073253 A CN201210073253 A CN 201210073253A CN 102603142 B CN102603142 B CN 102603142B
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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 solid waste resource recovery technical field, relate to a kind of method that 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 is built 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 has been played in the reduction of municipal pollution being loaded in construction and the operation of these sewage works, in sewage treatment process, by product municipal sludge amount also increases day by day.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 turns to resource and turns to main soil utilization from simple landfill.And before mud carries out soil utilization, need mud to carry out stabilization treatment, reclaim a large amount of biomass energy containing in mud, anaerobic digestion is one of important measures of sludge stabilizing, not only process institute energy requirement is lower, also biomass energy in recyclable mud, is a kind of sludge resource technology that has very much application prospect.
Traditional anaerobic digestion process is owing to having sluggish, sludge retention time long (30～40 days), and the shortcoming such as pond body bulk is huge, and the low and sludge degradation degree of methane production is poor, has limited the performance of anaerobic digestion techniques advantage.In recent years, how Chinese scholars reclaims biomass energy research to improving anaerobic sludge digestion from how strengthening pretreatment process equal angles takes in, and the improvement of anaerobic ferment process is not paid close attention to.
Summary of the invention
Few for China's sludge anaerobic fermentation to produce tolerance, aerogenesis is unstable, be difficult to apply the defect that anaerobism stabilization process is processed it, a kind of method that the object of this invention is to provide pre-treatment pump around circuit mud reinforced anaerobic fermentation gas, the method improves sludge anaerobic digestion gas production total amount, has shortened sludge retention time.
Technical scheme of the present invention is as follows:
The invention provides a kind of method that pre-treatment pump around circuit mud reinforced anaerobic fermentation produces biogas, the method comprises the following 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 same volume, after pretreatment, anaerobic digestion is carried out in recirculation to returned sluge simultaneously, collects biogas.
Described mixing sludge water ratio is 88～98%.
The reflux ratio of described returned sluge is 5～10%.
Described charging or discharging refer to load=digested sludge inlet amount every day=every day total amount/sludge retention time.
In described anaerobic digestion process, sludge retention time is 20～30d.
Described pre-treatment is alkaline hydrolysis pre-treatment, heat pre-treatment or Microwave Pretreatment.
Described alkaline hydrolysis pre-treatment refers to by adding alkaline reagents, makes mud under alkaline condition and stirs the object that 1～6h cracks to reach alkalescence, and again before anaerobic digestion, adding salt acid for adjusting 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 of 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.
It is 35 ± 2 ℃ or 55 ± 2 ℃ that temperature is controlled in described anaerobic digestion, and regulating pH is 7.5 ± 0.5, and stirring velocity is 30～250rpm.
The present invention compared with the existing technology, has the following advantages and beneficial effect:
1, the inventive method improves the sludge anaerobic fermenting organism mass-energy rate of recovery, stablizes gas production rate, and application is convenient, further promotes recycling sludge.
2, the inventive method increases alkaline hydrolysis cycle for the treatment of returned sluge system, has both strengthened the mixed effect of fermentation system, has strengthened again the dissolving of solid organic matters, makes the operation of reactor efficient stable.
3, the inventive method has improved sludge anaerobic digestion gas production total amount, has shortened sludge retention time, has reduced sludge anaerobic fermentor tank volume.
4, after the inventive method can realize grog intensive treatment, backflow utilizes, and for organism of fermentation provides abundant organic substrates, improves sludge anaerobic fermentation methane turnout, shortens the anaerobically fermenting cycle.
Accompanying drawing explanation
Fig. 1 represents 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 represents 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 represents 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 accompanying drawing illustrated embodiment, the present invention is further illustrated.
Embodiment 1
Fig. 1 represents that alkaline hydrolysis cycle for the treatment of 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 mud preparing pool, to be made into water ratio be that 92%, VS/TS is 0.45 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, to alkaline hydrolysis setting device, add NaOH by the ripe mud of gravity reflux 1L (reflux ratio is 5%) every day under the agitation condition of 120rpm, and NaOH dosage is 0.05g/gVS.After reaction 2h, add salt acid for adjusting pH to 7.5, then pump in fermentor tank through recycle feed mouth by sludge circulation pump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 100rpm.Move continuously after 2～3 cycles (i.e. 40～60d), can continous-stable aerogenesis.Experimental result is, 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 mud preparing pool, to be made into water ratio be that 92%, VS/TS is 0.45 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging is simultaneously to collecting in mud sump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 100rpm.Move continuously after 2～3 cycles (i.e. 40～60d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 10～11L, and methane content is 62.3%, and degradation effect of organic compound is 28%.
As can be seen here, embodiment 1 compares the average daily gas production rate of comparative example 1 and has improved 182～20%, and degradation effect of organic compound has increased 7%.
Embodiment 2
Getting somewhere sewage work thickened sludge and dewatered sludge, in mud preparing pool, to be made into water ratio be that 98%, VS/TS is 0.75 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, to alkaline hydrolysis setting device, add CaO by the ripe mud of gravity reflux 4L (reflux ratio is 6.7%) every day under the agitation condition of 120rpm, and CaO dosage is 0.010g/gVS.After reaction 6h, add salt acid for adjusting pH to 7.5, then pump in fermentor tank through recycle feed mouth by sludge circulation pump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 50rpm.Move continuously after 2～3 cycles (i.e. 60～90d), can continous-stable aerogenesis.Experimental result is, 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 mud preparing pool, to be made into water ratio be that 98%, VS/TS is 0.75 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging is simultaneously to collecting in mud sump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 50rpm.Move continuously after 2～3 cycles (i.e. 60～90d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 9.0～10.0L, and methane content is 63.6%, and degradation effect of organic compound is 36%.
As can be seen here, embodiment 2 compares the average daily gas production rate of comparative example 2 and has improved 20.0～33.3%, and degradation effect of organic compound has increased 9%.
Embodiment 3
Getting somewhere sewage work thickened sludge and dewatered sludge, in mud preparing pool, to be made into water ratio be that 88%, VS/TS is 0.33 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 800mL drops into 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, to alkaline hydrolysis setting device, add Ca (OH) by 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.After reaction 4h, add salt acid for adjusting pH to 7.5, then pump in fermentor tank through recycle feed mouth by sludge circulation pump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 50～75d), can continous-stable aerogenesis.Experimental result is, 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 mud preparing pool, to be made into water ratio be that 88%, VS/TS is 0.33 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 800mL drops into 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging is simultaneously to collecting in mud sump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 50～75d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 8～9L, and methane content is 63.3%, and degradation effect of organic compound is 22%.
As can be seen here, embodiment 3 compares the average daily gas production rate of comparative example 3 and has improved 22.2～25.0%, and degradation effect of organic compound has increased 9%.
Embodiment 4
Getting somewhere sewage work thickened sludge and dewatered sludge, in mud preparing pool, to be made into water ratio be that 94%, VS/TS is 0.45 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, to alkaline hydrolysis setting device, add NaOH by the ripe mud of gravity reflux 3L (reflux ratio is 7.5%) every day under the agitation condition of 120rpm, and NaOH dosage is 0.08g/gVS.After reaction 4h, add salt acid for adjusting pH to 7.5, then pump in fermentor tank through recycle feed mouth by sludge circulation pump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 53.4～80.1d), can continous-stable aerogenesis.Experimental result is, 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 mud preparing pool, to be made into water ratio be that 94%, VS/TS is 0.45 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging is simultaneously to collecting in mud sump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 53.4～80.1d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 12～13L, and methane content is 61.2%, and degradation effect of organic compound is 31%.
As can be seen here, embodiment 4 compares the average daily gas production rate of comparative example 4 and has improved 23.1～25.0%, and degradation effect of organic compound has increased 7%.
Embodiment 5
Fig. 2 represents that heat pre-treatment pump around circuit mud reinforced anaerobic fermentation of the present invention produces the schema of the method for biogas.
It is that 92%, VS/TS is 0.45 mixing sludge that somewhere sewage work thickened sludge and dewatered sludge are made into water ratio in mud preparing pool.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set,, to heating pretreatment device through 120 degree heating 30mins after by sludge circulation pump through recycle feed mouth pump in fermentor tank by gravity reflux 1L mud (reflux ratio is 5%) every day.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 100rpm.Move continuously after 2～3 cycles (i.e. 40～60d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 13～14L, and methane content is 65.3, and degradation effect of organic compound is 36%.
The embodiment 5 relatively average daily gas production rate of example 1 has improved 27.3～30.0%, and degradation effect of organic compound has increased 7%.
Embodiment 6
It is that 98%, VS/TS is 0.75 mixing sludge that somewhere sewage work thickened sludge and dewatered sludge are made into water ratio in mud preparing pool.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set,, to heating pretreatment device through 90 ℃ heating 60min after by sludge circulation pump through recycle feed mouth pump in fermentor tank by gravity reflux 4L mud (reflux ratio is 6.7%) every day.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 50rpm.Move continuously after 2～3 cycles (i.e. 50～75d), can continous-stable aerogenesis.Experimental result is, average daily aerogenesis 14.0～15.0L, and methane content is 65.3%, degradation effect of organic compound is 46%.
The embodiment 6 relatively average daily gas production rate of example 2 has improved 50.5～55.6%, and degradation effect of organic compound has increased 10%.
Embodiment 7
It is that 88%, VS/TS is 0.33 anaerobically digested sludge that somewhere sewage work thickened sludge and dewatered sludge are made into water ratio at mud preparing pool.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned excess sludge of 800mL drops into 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set,, to heating pretreatment device through 170 degree heating 10mins after by sludge circulation pump through recycle feed mouth pump in fermentor tank by gravity reflux 2L mud (reflux ratio is 10%) every day.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 50～75d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 12～13L, and methane content is 64.7%, and degradation effect of organic compound is 33%.
The embodiment 7 relatively average daily gas production rate of example 3 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 mud preparing pool, to be made into water ratio be that 94%, VS/TS is 0.45 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set,, to heating pretreatment device through 120 degree heating 20mins after by sludge circulation pump through recycle feed mouth pump in fermentor tank by the ripe mud of gravity reflux 3L (reflux ratio is 7.5%) every day.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 53.4～80.1d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 16～17L, and methane content is 65.5%, and degradation effect of organic compound is 40%.
The embodiment 8 relatively average daily gas production rate of example 4 has improved 30.8～33.3%, and degradation effect of organic compound has increased 8%.
Embodiment 9
Fig. 3 represents 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 mud preparing pool, to be made into water ratio be that 92%, VS/TS is 0.45 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1L drops into 20L effective volume (corresponding sludge retention time is 20d), and the 1L of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, every day, microwave frequency was 2450MHz, under 1000W condition, after microwave exposure 1min, by sludge circulation pump, pumps in fermentor tank by the ripe mud of gravity reflux 1L (reflux ratio is 5%) to microwave radiation device.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 100rpm.Move continuously after 2～3 cycles (i.e. 40～60d), can continous-stable aerogenesis.Experimental result is, 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%.
The embodiment 9 relatively average daily gas production rate of example 1 has improved 22.7～25.0%, and degradation effect of organic compound has increased 7.5%.
Embodiment 10
It is that 98%, VS/TS is 0.75 mixing sludge that somewhere sewage work thickened sludge and dewatered sludge are made into water ratio in mud preparing pool.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 2L drops into 60L effective volume (corresponding sludge retention time is 30d), and the 2L of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, every day by gravity reflux 4L mud (reflux ratio is 6.7%) to microwave radiation device, microwave frequency is 2450MHz, under 600W condition, after microwave exposure 4min, by sludge circulation pump, pumps in fermentor tank.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 50rpm.Move continuously after 2～3 cycles (i.e. 50～75d), can continous-stable aerogenesis.Experimental result is, average daily aerogenesis 12.0～13.0L, and methane content is 64.9%, degradation effect of organic compound is 45.5%.
The embodiment 10 relatively average daily gas production rate of example 2 has improved 30.0～33.3%, and degradation effect of organic compound has increased 9.5%.
Embodiment 11
It is that 88%, VS/TS is 0.33 anaerobically digested sludge that somewhere sewage work thickened sludge and dewatered sludge are made into water ratio at mud preparing pool.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned excess sludge of 800mL drops into 20L effective volume (corresponding sludge retention time is 25d), and the 800mL of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, every day by gravity reflux 2L mud (reflux ratio is 10%) to microwave radiation device, microwave frequency is 2450MHz, under 800W condition, after microwave exposure 5min, by sludge circulation pump, pumps in fermentor tank.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 50～75d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 11～12L, and methane content is 65.2%, and degradation effect of organic compound is 32%.
The embodiment 11 relatively average daily gas production rate of example 3 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 mud preparing pool, to be made into water ratio be that 94%, VS/TS is 0.45 mixing sludge.Every day, normal input and output material was as follows: get in the fermentor tank that the above-mentioned mixing sludge of 1500mL drops into 40L effective volume (corresponding sludge retention time is 26.7d), and the 1500mL of discharging is simultaneously to collecting in mud sump.Separately in fermentor tank lower end, circulation discharge port is set, every day by the ripe mud of gravity reflux 3L (reflux ratio is 7.5%) to microwave radiation device, microwave frequency is 2450MHz, under 200W condition, after microwave exposure 20min, by sludge circulation pump, pumps in fermentor tank.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.Move continuously after 2～3 cycles (i.e. 53.4～80.1d), can continous-stable aerogenesis.Experimental result is, average daily gas production rate is 15.5～16.5L, and methane content is 66.5%, and degradation effect of organic compound is 39%.
The embodiment 12 relatively average daily gas production rate of example 4 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 apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.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 departing from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (7)
1. the fermentation of pre-treatment pump around circuit mud reinforced anaerobic produces a method for biogas, it is characterized in that: the method comprises the following 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 same volume, after pretreatment, anaerobic digestion is carried out in recirculation to returned sluge simultaneously, collects biogas;
Described mixing sludge water ratio is 92～98%, and the reflux ratio of described returned sluge is 5～10%;
Described charging or discharging refer to load=digested sludge inlet amount every day=every day total amount/sludge retention time;
Described pre-treatment is alkaline hydrolysis pre-treatment, heat pre-treatment or Microwave Pretreatment.
2. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, it is characterized in that: in described anaerobic digestion process, sludge retention time is 20～30d.
3. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, it is characterized in that: described alkaline hydrolysis pre-treatment refers to by adding alkaline reagents, make mud stir 1～6h under alkaline condition, and again before anaerobic digestion, adding salt acid for adjusting pH to 7.5 ± 0.5..
4. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 3 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 of volatility organic solid VS adds alkaline reagents, i.e. 0.05～0.15g/g VS.
5. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, it is characterized in that: described heat pre-treatment temperature is 90～170 ℃, and the time is 10～60min.
6. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 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.
7. pre-treatment pump around circuit mud reinforced anaerobic fermentation according to claim 1 produces the method for biogas, it is characterized in that: it is 35 ± 2 ℃ or 55 ± 2 ℃ that temperature is controlled in described anaerobic digestion, and regulating pH is 7.5 ± 0.5, and stirring velocity is 30～250rpm.
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| CN103214091B (en) * | 2013-03-07 | 2016-01-20 | 中国科学院生态环境研究中心 | A kind of source sludge decrement process of returned sluge alkaline purification-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 |
| CN112679061A (en) * | 2019-10-17 | 2021-04-20 | 天津大学 | Method for preparing biogas by anaerobic digestion of sludge and biogas obtained by method |
| CN112321113B (en) * | 2020-10-30 | 2021-12-31 | 上海市政工程设计研究总院（集团）有限公司 | Sludge treatment method and anaerobic digestion tank |
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| CN101905945A (en) * | 2010-07-20 | 2010-12-08 | 刘伟 | Municipal sludge energy treatment system |
| CN102020404A (en) * | 2010-12-01 | 2011-04-20 | 同济大学 | Method for improving fermentation capability of slurry dry process |
| CN102115344A (en) * | 2010-12-03 | 2011-07-06 | 清华大学 | Two-phase integral anaerobic digestion process and equipment for treating biomass solid wastes |
| CN102241464A (en) * | 2011-06-01 | 2011-11-16 | 北京中持绿色能源环境技术有限公司 | Urban sludge treating method and equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101905945A (en) * | 2010-07-20 | 2010-12-08 | 刘伟 | Municipal sludge energy treatment system |
| CN102020404A (en) * | 2010-12-01 | 2011-04-20 | 同济大学 | Method for improving fermentation capability of slurry dry process |
| CN102115344A (en) * | 2010-12-03 | 2011-07-06 | 清华大学 | Two-phase integral anaerobic digestion process and equipment for treating biomass solid wastes |
| CN102241464A (en) * | 2011-06-01 | 2011-11-16 | 北京中持绿色能源环境技术有限公司 | Urban sludge treating method and equipment |
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