CN102586345B - Method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation - Google Patents
Method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation Download PDFInfo
- Publication number
- CN102586345B CN102586345B CN201210073227.XA CN201210073227A CN102586345B CN 102586345 B CN102586345 B CN 102586345B CN 201210073227 A CN201210073227 A CN 201210073227A CN 102586345 B CN102586345 B CN 102586345B
- Authority
- CN
- China
- Prior art keywords
- sludge
- microwave
- anaerobic fermentation
- alkaline
- anaerobically fermenting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the field of sludge recycling processing and discloses a method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation. The method includes the following steps: concentrated sludge and dewatered sludge are mixed to obtain mixed sludge, the mixed sludge is used as feed to conduct alkaline anaerobic fermentation to produce acid, simultaneously the sludge flows back to conduct microwave preprocessing, the sludge is circulated again to conduct alkaline anaerobic fermentation, and materials are discharged, and mixed liquid with high acid content is collected. The system combines technology such as alkaline adjusting, microwave strengthening wall breaking and circulation backflow, achieves combination of physical chemistry strengthening processing technology and microbiological processing technology, really achieves high-efficient utilization of an organic substrate, and improves operation stability of the whole system.
Description
Technical field
The invention belongs to recycling sludge process field, relate to a kind of method of producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation.
Background technology
A certain amount of pathogenic micro-organism, heavy metal and other objectionable constituent in the excess sludge producing in town sewage plant sewage treatment process, were both contained, also contain nutritive element and the large amount of organic matter such as N, P, K simultaneously, they are a kind of environmental pollutant, are also a kind of effectively Biological resources.Along with developing rapidly and the continuous increase of urban population of Chinese society economy, the scale of municipal wastewater treatment plant and quantity are all in continuous increase, the sludge quantity that sewage treatment process produces also increases greatly, and it will be a problem demanding prompt solution that the mud therefore how China's Sewage Plant being produced carries out rational recycling.
Sludge anaerobic fermentation and acid production is a kind of conventional recycling sludge method.Organic acid (the particularly short chain fatty acid that utilizes this kind of method to produce, comprise acetic acid, propionic acid etc.), can, for the preparation of the industrial chemicals such as agricultural chemicals, paint and coating, in bio-denitrifying sewage dephosphorization process, be not only also the essential important organic carbon source of microorganism.Research shows, in enhanced biological phosphorus removal system, the phosphorus of every removal 1mg just needs the short chain fatty acid of 6-9mg.But as a rule, the short chain fatty acid in waste water all can not meet lower water outlet phosphorus concentration, especially the organic concentration in the sewage of Shelter in South China Cities is not enough especially, and this,, with regard to a large amount of phosphorus is discharged in environment, has caused the eutrophication of water body.In order to make the phosphorus concentration in water outlet reach sewage drainage standard, just need in biological treatment system, add this carbon source that is easy to biological utilisation of organic acid, and sludge anaerobic fermentation and acid production just in time can provide this carbon source.
Anaerobic sludge digestion comprises hydrolysis, acidifying and three processes of product methane, and fermentation and acid belongs to front two stages.From producing organic acid angle, if can improve the hydrolysis rate of mud, suppress the activity of methanogen simultaneously, just can on the basis of shortening system hydraulic detention time, a large amount of organic acids be accumulated.According to research reports, the suitableeest existence pH environment of methanogen is in neutral left and right, and higher pH (as pH=9 or 10) can suppress the activity of methanogen.
As everyone knows, at the product acid phase of sludge anaerobic fermentation, organic granular hydrolysis is the rate-limiting step of whole mud acid process.But the microorganism wall of composition mud has very strong restraining effect to hydrolysis, this reaches with regard to having caused traditional anaerobic fermentation technology to be difficult to the object that efficient product is sour.Especially in current China, because the VS/TS of the mud of China's Sewage Plant discharge is lower, further limit the acidication of mud.
Summary of the invention
Lower for organic content in China's mud, acidication is more difficult, is difficult to the efficient sour defect of producing, and the object of this invention is to provide a kind of method of producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation.
Technical scheme of the present invention is as follows:
A kind of method that the invention provides producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation, the method comprises the following steps:
Thickened sludge and dewatered sludge are made into mixing sludge, get above-mentioned mixing sludge and carry out alkaline anaerobic fermentation and acid production as charging, returned sluge carries out Microwave Pretreatment simultaneously, and alkaline anaerobically fermenting is carried out in recirculation, and high acid content mixed solution is collected in discharging.
Described charging or discharging refer to load=digested sludge inlet amount every day=every day total amount/sludge retention time.
The reflux ratio of described returned sluge is 5～20%.
Described alkaline anaerobically fermenting refers under the condition of closing anaerobic, and controlling temperature is 20～55 ℃, and stirring velocity is 30～250rpm, and adding alkaline reagents, to regulate pH be 9.0～11.0.
Described alkaline reagents is sodium hydroxide or unslaked lime.
The operational condition of described Microwave Pretreatment is: microwave frequency is 2450MHz, and microwave irradiation power is 200～1000w, and radiated time is 1～20min.
The sludge retention time of described alkaline anaerobically fermenting is 3～8d.
The water ratio of described mixing sludge is 88～98%.
The present invention compared with the existing technology, has the following advantages and beneficial effect:
1, system provided by the present invention combines the technology such as alkalescence adjusting, microwave reinforced broken wall, pump around circuit, physical chemistry intensive treatment technology and the combination of microbiological treatment technology are realized, really realize the efficient utilization of organic substrates, improved the operation stability of whole system.
2, the mud that the present invention utilizes municipal wastewater treatment plant to produce is produced organic acid, has not only reduced the harm of the organism in mud to environment, and has produced the organic acid that Sewage Plant is had to utility value, has realized veritably the recycling of pollutent.System provided by the present invention is by the organic setting of sludge reflux intensifying device in system, can guarantee to produce the steady running under methane fermentation Duan Gao organic concentration, there is very high organic loading and organic removal rate, biogas output and productive rate are high, have improved the processing efficiency of whole system.
3, the organic acid that the present invention produces can be used for supplementing in Sewage Plant the deficiency of carbon source in biological denitrification phosphorous removal technique, meet the demand of microorganisms of nitrogen and phosphors removal to carbon source, thereby can reduce the concentrating of nutrients such as nitrogen, phosphorus in water outlet, prevent the generation of body eutrophication.
4, not only processing efficiency is high for system provided by the invention, and compact construction, the running that cooperatively interacts, stable, is adapted at applying in large, medium and small sewage work.
Accompanying drawing explanation
Fig. 1 represents the schema of the method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation of the present invention.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.
Embodiment 1
As shown in Figure 1, Fig. 1 represents the schema of the method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation of the present invention.
Getting somewhere sewage work dewatered sludge (water ratio is 79.23%) and thickened sludge (water ratio is 98.12%), in mud preparing pool, to be made into water ratio be 98.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 65.2%.Pump into 10.0L (corresponding sludge retention time be 3d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 30L, pH is controlled between 9.0～11.0 by adding NaOH in anaerobically fermenting chamber, and controls 20 ℃ of temperature, stirring velocity 50rpm.And bypass discharging every day 3L (reflux ratio is 10%) is set on proving room limit to microwave radiation device, and microwave frequency is 2450MHz, after 600W microwave radiation 10min, recirculation is put in anaerobically fermenting chamber.The 10L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 1100～1200mg/L.
Comparative example 1
Getting somewhere sewage work dewatered sludge (water ratio is 79.23%) and thickened sludge (water ratio is 98.12%), in mud preparing pool, to be made into water ratio be 98.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 65.2%.Pump into 10.0L (corresponding sludge retention time be 3d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 30L, pH is controlled between 9.0～11.0 by adding NaOH in anaerobically fermenting chamber, and controls 20 ℃ of temperature, stirring velocity 50rpm.The 10L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 800～900mg/L.
As can be seen here, embodiment 1 relatively in example 1 discharging the concentration of general volatile lipid acid improved 33.3～37.5%.
Embodiment 2
Getting somewhere sewage work dewatered sludge (water ratio is 80.31%) and thickened sludge (water ratio is 98.03%), in mud preparing pool, to be made into water ratio be 92.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 60.3%.Pump into 10L (sludge retention time be 5d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 50L, anaerobically fermenting chamber is by adding unslaked lime control pH between 9.0～11.0, and controls 36 ℃ of temperature, stirring velocity 100rpm.And bypass discharging every day 10L (reflux ratio is 20%) is set on proving room limit to microwave radiation device, and microwave frequency is 2450MHz, after 1000W microwave radiation 1min, recirculation is put in anaerobically fermenting chamber.The 10L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 2300～2500mg/L.
Comparative example 2
Getting somewhere sewage work dewatered sludge (water ratio is 80.31%) and thickened sludge (water ratio is 98.03%), in mud preparing pool, to be made into water ratio be 92.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 60.3%.Pump into 10L (sludge retention time be 5d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 50L, anaerobically fermenting chamber is by adding unslaked lime control pH between 9.0～11.0, and controls 36 ℃ of temperature, stirring velocity 100rpm.The 10L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 1900～2100mg/L.
As can be seen here, embodiment 2 relatively in example 2 dischargings the concentration of general volatile lipid acid improved 19.0～211%.
Embodiment 3
Getting somewhere sewage work dewatered sludge (water ratio is 82.11%) and thickened sludge (water ratio is 97.89%), in mud preparing pool, to be made into water ratio be 88.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 38.3%.Pump into 2.5L (corresponding sludge retention time be 8d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 20L, pH is controlled between 9.0～11.0 by adding NaOH in anaerobically fermenting chamber, and controls 40 ℃ of temperature, stirring velocity 150rpm.And bypass discharging every day 1L (reflux ratio is 5%) is set on proving room limit to microwave radiation device, and microwave frequency is 2450MHz, after 800W microwave radiation 5min, recirculation is put in anaerobically fermenting chamber.The 2.5L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 2000～2200mg/L.
Comparative example 3
Getting somewhere sewage work dewatered sludge (water ratio is 82.11%) and thickened sludge (water ratio is 97.89%), in mud preparing pool, to be made into water ratio be 88.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 38.3%.Pump into 2.5L (corresponding sludge retention time be 8d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 20L, pH is controlled between 9.0～11.0 by adding NaOH in anaerobically fermenting chamber, and controls 40 ℃ of temperature, stirring velocity 150rpm.The 2.5L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 1600～1800mg/L.
As can be seen here, embodiment 3 relatively in example 3 dischargings the concentration of general volatile lipid acid improved 22.2～25.0%.
Embodiment 4
Getting somewhere sewage work dewatered sludge (water ratio is 82.69%) and thickened sludge (water ratio is 98.03%), in mud preparing pool, to be made into water ratio be 92.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 59.4%.Pump into 10L (corresponding sludge retention time be 5d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 50L, anaerobically fermenting chamber is by adding unslaked lime control pH between 9.0～11.0, and controls 55 ℃ of temperature, stirring velocity 100rpm.And bypass discharging every day 5L (reflux ratio is 10%) is set on proving room limit to microwave radiation device, and microwave frequency is 2450MHz, after 200W microwave radiation 20min, recirculation is put in anaerobically fermenting chamber.The 10L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 2400～2600mg/L.
Comparative example 4
Getting somewhere sewage work dewatered sludge (water ratio is 82.69%) and thickened sludge (water ratio is 98.03%), in mud preparing pool, to be made into water ratio be 92.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 59.4%.Pump into 10L (corresponding sludge retention time be 5d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 50L, anaerobically fermenting chamber is by adding unslaked lime control pH between 9.0～11.0, and controls 55 ℃ of temperature, stirring velocity 100rpm.The 10L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 1800～2000mg/L.
As can be seen here, embodiment 4 relatively in example 4 dischargings the concentration of general volatile lipid acid improved 30.0～33.3%.
Embodiment 5
Getting somewhere sewage work dewatered sludge (water ratio is 80.03%) and thickened sludge (water ratio is 98.32%), in mud preparing pool, to be made into water ratio be 90.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 39.3%.Pump into 4.0L (corresponding sludge retention time be 5d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 20L, pH is controlled between 9.0～11.0 by adding NaOH in anaerobically fermenting chamber, and controls 35 ℃ of temperature, stirring velocity 150rpm.And bypass discharging every day 500mL (reflux ratio is 12.5%) is set on proving room limit to microwave radiation device, and microwave frequency is 2450MHz, after 800W microwave radiation 5min, recirculation is put in anaerobically fermenting chamber.The 4.0L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 1700～1900mg/L.
Comparative example 5
Getting somewhere sewage work dewatered sludge (water ratio is 80.03%) and thickened sludge (water ratio is 98.32%), in mud preparing pool, to be made into water ratio be 90.0% mixing sludge, and the ratio that now its volatility organic solid concentration accounts for total solid concentration is 39.3%.Pump into 4.0L (corresponding sludge retention time be 5d) to anaerobically fermenting chamber by sludge pump every day, wherein the total effective volume in anaerobically fermenting chamber is 20L, pH is controlled between 9.0～11.0 by adding NaOH in anaerobically fermenting chamber, and controls 35 ℃ of temperature, stirring velocity 150rpm.And discharging every day 500mL (reflux ratio is 12.5%) is to microwave radiation device, and after 800W microwave radiation 5min, recirculation is put in anaerobically fermenting chamber.The 4.0L of discharging every day simultaneously obtains high acid content mixed solution.After operation, can stablize and produce acid continuously, in discharging, the concentration of general volatile lipid acid is 1300～1500mg/L.
As can be seen here, embodiment 5 relatively in example 5 dischargings the concentration of general volatile lipid acid improved 26.7～38.5%.
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 (1)
1. a method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation, 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 alkaline anaerobic fermentation and acid production as charging, returned sluge carries out Microwave Pretreatment simultaneously, and alkaline anaerobically fermenting is carried out in recirculation, and high acid content mixed solution is collected in discharging;
Described charging or discharging refer to load=digested sludge inlet amount every day=every day total amount/sludge retention time;
The reflux ratio of described returned sluge is 5～20%;
Described alkaline anaerobically fermenting refers under the condition of closing anaerobic, and controlling temperature is 20～55 ℃, and stirring velocity is 30～250rpm, and adding alkaline reagents, to regulate pH be 9.0～11.0;
Described alkaline reagents is sodium hydroxide or unslaked lime;
The operational condition of described Microwave Pretreatment is: microwave frequency is 2450MHz, and microwave irradiation power is 200～1000w, and radiated time is 1～20min;
The sludge retention time of described alkaline anaerobically fermenting is 3～8d;
The water ratio of described mixing sludge is 88～98%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210073227.XA CN102586345B (en) | 2012-03-19 | 2012-03-19 | Method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210073227.XA CN102586345B (en) | 2012-03-19 | 2012-03-19 | Method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102586345A CN102586345A (en) | 2012-07-18 |
| CN102586345B true CN102586345B (en) | 2014-06-25 |
Family
ID=46475569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210073227.XA Expired - Fee Related CN102586345B (en) | 2012-03-19 | 2012-03-19 | Method for producing volatile fatty acid by using microwave circulation sludge anaerobic fermentation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102586345B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102786196B (en) * | 2012-07-24 | 2014-03-05 | 北京工业大学 | Method capable of guaranteeing acid production of surplus sludge and improving dewatering performance of fermented sludge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3654789B2 (en) * | 1999-04-08 | 2005-06-02 | 鹿島建設株式会社 | Sludge treatment method and apparatus |
-
2012
- 2012-03-19 CN CN201210073227.XA patent/CN102586345B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102586345A (en) | 2012-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102001784B (en) | High efficiency low energy consumption urban sewage dephosphorization denitrification treatment method | |
| CN106430562B (en) | A kind of processing method of poultry discharged wastewater met the national standard | |
| CN104118971B (en) | A kind of method utilizing Sewage Plant mixing sludge hydrolysed ferment intensified denitrification and dephosphorization | |
| CN103332829B (en) | Enhanced sewage biological nitrogen and phosphorus removal method bases on polyhydroxyalkanoate metabolism regulation | |
| CN109574218B (en) | Device and method for treating late landfill leachate through shortcut nitrification-fermentation/denitrification-anaerobic ammonia oxidation process | |
| CN101973672B (en) | Zero-energy consumption urban sewage dephosphorization treatment method | |
| CN101935136B (en) | Zero energy consumption low sludge yield municipal sewage dephosphorization and denitrification treatment method | |
| CN102603135B (en) | Method for producing biogas by aid of intensified anaerobic fermentation of circular backflow sludge in microwave and alkali combined treatment | |
| CN104291529B (en) | The apparatus and method of part denitrification-Anammox process high concentration nitrate waste water and municipal effluent | |
| CN104404090A (en) | Method for promoting residual sludge to carry out anaerobic fermentation to produce acid | |
| CN103693813B (en) | Device and method for strengthening sludge digestion and synchronously denitrifying and dephosphorizing | |
| CN103601289A (en) | Device and method for realization of partially denitrified synchronous autotrophic nitrogen removal by sludge fermentation coupled denitrification | |
| CN102101718B (en) | Sludge hydrolysis acidification coupling denitrification device and treatment method thereof | |
| CN102586344B (en) | Method for producing volatile fatty acid through heating and circular anaerobic fermentation of sludge | |
| CN108455786A (en) | A kind of method of sludge-digestion liquid microalgae Anammox coupling production capacity | |
| CN204417293U (en) | A kind of denitrification dephosphorization apparatus | |
| CN103304042A (en) | Method for preparing rapid external carbon source through cassava ethanol wastewater | |
| CN102070286A (en) | Method for improving sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment | |
| CN102583922A (en) | Double-circulation two-phase anaerobic digestion system and application thereof | |
| CN109231746A (en) | A kind of method that iron electrode activation persulfate pretreating sludge optimization produces sour structure | |
| CN103112948B (en) | Method for rapidly culturing autotrophic nitrogen removal granule sludge under conditions of low substrate concentration and high ascending velocity | |
| CN101935130B (en) | Zero-energy consumption and low sludge yield method for denitrifying urban sewage | |
| CN102603142B (en) | Method for producing biogas by aid of intensified anaerobic fermentation of pretreated circular backflow sludge | |
| CN102603140B (en) | Process for conducting two-phase anaerobic digestion on sludge by reflux and heating reinforcement | |
| CN104150609B (en) | A kind of method of in-situ enrichment nitrifier coupling sludge hydrolytic intensified denitrification and dephosphorization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |