CN103160546A - Method for improving short-chain fatty acid produced by excess sludge through hot alkali combined pretreatment - Google Patents
Method for improving short-chain fatty acid produced by excess sludge through hot alkali combined pretreatment Download PDFInfo
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Abstract
The invention belongs to the technical field of environmental protection, and relates to a method for improving short-chain fatty acid produced by excess sludge through hot alkali combined pretreatment. According to the method, the excess sludge in a sewage treatment plant serves as raw material, through hot pretreatment, controlling of initial alkaline power of hydrogen (PH) value conditions and the functions of microorganism is conducted, not only are non-aqueous resolvable organic matters in the sludge promoted to be dissolved and are the non-aqueous resolvable organic matters hydrolyzed to be converted to resolvable organic matters, but also the resolvable organic matters such as protein and polysaccharide are fully converted into the short-chain fatty acid, and pollution of the sludge to the environment is reduced. The temperature of the hot pretreatment is 60-120 DEG C, the time of the hot pretreatment is 15-60min, the initial PH value range of the functions of the microorganism is 8-12, the standing time of the sludge in a reactor is 1-12 days, and the temperature is 30-40 DEG C.
Description
Technical field
The invention belongs to environmental protection technical field, relate to a kind of thermokalite combined pretreatment and improve the method that excess sludge produces short chain fatty acid.
Background technology
Activated sludge process is present stage to use biological sewage treatment mode the most widely, but it can produce a large amount of excess sludges when purifying waste water.Contain the materials such as more microorganism, suspended substance, colloid and nitrogen, phosphorus in the excess sludge that urban wastewater treatment firm produces, if can not get appropriate processing and disposal, will produce secondary pollution to environment.Owing to containing a large amount of organic substances in excess sludge, use sludge anaerobic fermentation to produce biogas, not only can recycle organic substance wherein, can also effectively solve the difficult problem that sewage work produces excessive excess sludge.The anaerobically fermenting of organic solid produces the methane process can be divided into four-stage, namely dissolves stage, hydrolysis stage, product acid phase and produces methane phase.Under usual conditions, dissolving and the hydrolysis rate of mud are slower, are rate-limiting step (for example, document Bioresour. Technol. 2012,103, the 415-424 of organic matter biodegradation process; Bioresour. Technol. 2011,102,10849-10854).Therefore, in the fermentation and acid process, if can improve dissolving and the hydrolysis rate of mud, so just can shorten the hydraulic detention time of system, improve the organic matter removal rate, and more solvability fermentation substrate can be provided for follow-up acid process, and then improve methane production.Investigators have proposed the method for the dissolving of many raising mud and hydrolysis rate, and the ultimate principle of these methods is that to impel the organic substance decomposing of particulate form in mud be the small organic molecule of solubilised state, thereby improves these organic biodegradabilities.Document has reported that more various pretreatment processs improve the dissolving hydrolysis efficiency of excess sludge, and not to how promoting simultaneously excess sludge hydrolysis and the method for producing sour efficient to study.
Use the method for hot pre-treatment excess sludge, just can promote the percent hydrolysis of mud, obtaining the pretreated method of using basic on the basis of hydrolysis efficiency preferably, can promote to produce again the amount of short chain fatty acid.Therefore, by the method for thermokalite combined pretreatment excess sludge, can improve simultaneously the hydrolysis stage of excess sludge and produce acid phase efficient, finally obtaining maximized short chain fatty acid.
Summary of the invention
The present invention will solve excess sludge and produce the not high technical problem of short chain fatty acid efficient, provides a kind of thermokalite combined pretreatment excess sludge to significantly improve the method that mud produces short chain fatty acid.
Of the present invention studies show that, excess sludge can significantly improve the organism such as protein in mud, polysaccharide and be dissolved in the water after overheated pre-treatment, provide abundant water-soluble organic substrate thereby produce acid for sludge fermentation.Simultaneously, after the pre-treatment of the initial alkaline pH condition of excess sludge process, can further promote the mud dissolving, be hydrolyzed and continue to produce short chain fatty acid.In addition, the alkaline pH value has obvious restraining effect (Environmental Science and Technology, 2006,40,2025-2029) to the activity of methanogen, has stoped to a certain extent the consumption of the short chain fatty acid that generates.Therefore, can utilize hot pre-treatment and the combined action of alkaline pH value condition to improve substantially the output of excess sludge biological production short chain fatty acid.
The thermokalite combined pretreatment excess sludge that the present invention proposes significantly improves the method that mud produces short chain fatty acid, concrete steps are: take the excess sludge of sewage work as raw material, initial pH value and the wherein effect of microorganism by hot pre-treatment, control microbial process, promote organism dissolving, the hydrolysis of non-solubility in excess sludge to be deliquescent organism, and to make these deliquescent organism be converted into short chain fatty acid; Described deliquescent organism is more than one in protein or polysaccharide, and actual conditions is:
The pretreated temperature of heat is 60-120 ℃, and the time is 15-60min;
The initial pH value scope of microbial process is 8-12;
After hot pre-treatment, the residence time of excess sludge in reactor is 1-12 days, and temperature is 30-40 ℃.
Further:
The pretreated temperature of heat is 98-102 ℃, time 28-32min.Although the pretreated temperature condition of described heat 60-120 ℃ with the scope of time conditions at 15-60min in, can further improve the output that mud is produced short chain fatty acid with the combined action of alkaline pH value condition, and in the regular hour scope, along with the output of the rising short chain fatty acid of hot pretreatment temperature also raises gradually.Consider the output of running cost and short chain fatty acid, therefore the more suitable hot pretreatment temperature that the present invention adopts is 98-102 ℃, the time is 28-32min.
The initial pH value of microbial process is 10.5-11.5.
The residence time of mud in reactor is 6-7 days, and temperature is 33-37 ℃.
The ultimate principle that the present invention adopts hot pre-treatment and initial alkaline pH value condition combined action to improve excess sludge generation short chain fatty acid is: Sludge Surface has been adhered to the outer polymer (main component is protein and polysaccharide etc.) of a large amount of born of the same parents, under hot pretreatment condition, the macromolecular substance protein of Sludge Surface and polysaccharide etc. will be subjected to thermal hydrolysis to break away from mud granule, and dissolving enters the aqueous solution.Meanwhile, initial alkaline pH value condition not only makes the acidic-group of the outer polymer of mud born of the same parents dissociate, and can make the mutual repulsion of negative charge of the outer polymer of Sludge Surface born of the same parents, causes the mud flco to disintegrate, thereby discharges a large amount of protein and polysaccharide.Like this under the combined action of hot pre-treatment and initial alkaline pH value condition, the hydrolysis rate of mud is all higher during either party independent role in both than above.The larger molecular organicses such as deliquescent protein and polysaccharide are at the external organism that further is hydrolyzed to lower molecular weight by the lytic enzyme of microorganisms of microorganism.This process is back and forth carried out until hydrolysate becomes enough little, so that can be by the direct assimilation of microorganism cells.The organism that is absorbed by microorganism enters the acidogenic fermentation stage, finally is converted into lipid acid.
Hot pre-treatment and initial alkaline pH value condition combined action improve excess sludge produces in the process of short-chain fat acid yield, if condition that can not the fine control sludge hydrolytic stage so just can't obtain more dissolved organic matter.In addition, if the fermentation condition during acidifying can not get good control, acidizing product is easy to enter the product methane phase.Therefore, the fermentation condition during rationally controlled hydrolysis, acidifying, making product after bio-transformation become the purpose organism that needs is to realize that the High-efficient Production organic acid is crucial.
In the present invention, the fermentation condition of major control is: the pH value when hot pretreated temperature, time, sludge fermentation and the residence time in reactor.Of the present invention studies show that, the pretreated temperature range of heat is in 60-120 ℃, and time range can promote mud to produce short chain fatty acid in 15-60min, and in the regular hour scope, along with the output of the rising short chain fatty acid of hot pretreatment temperature also raises gradually.Consider the output of running cost and short chain fatty acid, therefore the more suitable hot pretreatment temperature that the present invention adopts is 98-102 ℃, the time is 28-32min.The initial pH value scope of microbial process of the present invention is 8-12, and preferred initial pH value is 10.5-11.5.In addition, the residence time of mud in reactor is that 1-12 days, temperature are 30-40 ℃, is preferably 6-7 days, 33-37 ℃.
The invention has the beneficial effects as follows:
(1) under hot pre-treatment and initial alkaline pH value condition combined action, the output of sludge creation short chain fatty acid is significantly higher than the amount of the above short chain fatty acid that either party independent role produces in mud in both.
(2) hot pre-treatment and initial alkaline pH value condition combined action can improve the hydrolysis rate of mud preferably, improve simultaneously the rate of producing acid of mud, thereby shorten the time of sludge anaerobic fermentation, this is to improving and optimizing existing sludge treating system, and energy-saving and cost-reducing, minimizing running cost has definite meaning.
(3) short chain fatty acid of producing can be used for producing the clean energies such as methane, replenishes the deficiency of sludge anaerobic fermentation carbon source in latter stage, thus the organic substance in the excess sludge of degrading to greatest extent.
(4) utilize the excess sludge of urban wastewater treatment firm to produce organic acid, not only realized the purpose of sludge reduction, stabilization, resource utilization and reduce mud Organic pollutants environment, produced simultaneously to have and utilized the organic acid that is worth.
Embodiment
Be described in further detail below by embodiment.
Embodiment 1
16 liters of excess sludges are on average joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 46 liters of identical reactors, and hot pretreated temperature is respectively 60-120 ℃, and the time is 13-17min.The residence time of mud in reactor is 1-2 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the pretreated better condition of sludge hot is 98-102 ℃, and the short-chain fat acid yield is 268.6 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 2
16 liters of excess sludges are on average joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 46 liters of identical reactors, and hot pretreated temperature is 98-102 ℃, and the time is respectively 15-60min.The residence time of mud in reactor is 1-2 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the pretreated better condition of sludge hot is 98-102 ℃, time 28-32min, and the short-chain fat acid yield is 358.2 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 3
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 7.5-8.5, and the residence time of mud in reactor is 1-2 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 897.3 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 4
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 8.5-9.5, and the residence time of mud in reactor is 1-2 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 993.1 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 5
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 9.5-10.5, and the residence time of mud in reactor is 1-2 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 1379.5 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 6
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 1-2 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 1582.9 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 7
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 11.5-12.5, and the residence time of mud in reactor is 1-2 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 1371.6 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 8
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 3-4 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 2361.4 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 9
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 6-7 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 4361.4 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 10
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 8-9 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 4161.4 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 11
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 10-11 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 4130.9 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 12
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 12-3 days, and the anaerobically fermenting temperature is 28-32 ℃.Recording the short-chain fat acid yield is 4026.9 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 13
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 6-7 days, and the anaerobically fermenting temperature is 33-37 ℃.Recording the short-chain fat acid yield is 4958.2 milligrams every liter (in chemical oxygen demand (COD)).
Embodiment 14
4 liters of excess sludges are joined (reactor material is synthetic glass, and internal diameter 150mm, high 350mm are cylinder shape) in 16 liters of reactor, and hot pretreated temperature is 98-102 ℃, and the time is 28-32min.The conditioning of mud initial pH value is 10.5-11.5, and the residence time of mud in reactor is 6-7 days, and the anaerobically fermenting temperature is 38-42 ℃.Recording the short-chain fat acid yield is 4574.3 milligrams every liter (in chemical oxygen demand (COD)).
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and in the General Principle of this explanation is applied to other embodiment and needn't pass 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 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 (5)
1. a thermokalite combined pretreatment improves the method that excess sludge produces short chain fatty acid, it is characterized in that concrete steps are: take the excess sludge of sewage work as raw material, initial pH value and the wherein effect of microorganism by hot pre-treatment, control microbial process, promote organism dissolving, the hydrolysis of non-water-soluble in excess sludge to be deliquescent organism, and to make these deliquescent organism be converted into short chain fatty acid; Described deliquescent organism be in protein or polysaccharide more than one, actual conditions is:
The pretreated temperature of heat is 60-120 ℃, and the time is 15-60min;
The initial pH value scope of microbial process is 8-12;
After hot pre-treatment, the residence time of excess sludge in reactor is 1-12 days, and temperature is 30-40 ℃.
2. thermokalite combined pretreatment according to claim 1 improves the method that excess sludge produces short chain fatty acid, and it is characterized in that: hot pretreated temperature is 98-102 ℃, and the time is 28-32min.
3. thermokalite combined pretreatment according to claim 1 improves the method that excess sludge produces short chain fatty acid, and it is characterized in that: the initial pH value of microbial process is 10.5-11.5.
4. thermokalite combined pretreatment according to claim 1 improves the method that excess sludge produces short chain fatty acid, and it is characterized in that: the residence time of mud in reactor is 6-7 days.
5. thermokalite combined pretreatment according to claim 1 improves the method that excess sludge produces short chain fatty acid, and it is characterized in that: the temperature of mud in reactor is 33-37 ℃.
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| CN104862346A (en) * | 2015-05-04 | 2015-08-26 | 同济大学 | Method for increasing yield of short chain fatty acid produced with excess sludge through enzyme and alkali combined pretreatment |
| CN105063109A (en) * | 2015-09-02 | 2015-11-18 | 钟华 | Method for obtaining short-chain fatty acids by vegetable protein microbial fermentation |
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| CN109574434A (en) * | 2018-12-13 | 2019-04-05 | 上海交通大学 | A method of strengthening excess sludge anaerobic digestion methane phase using alkaloid |
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| CN103304042A (en) * | 2013-06-20 | 2013-09-18 | 同济大学 | Method for preparing rapid external carbon source through cassava ethanol wastewater |
| CN103613261A (en) * | 2013-11-19 | 2014-03-05 | 同济大学 | Thermal alkaline enhanced three-stage municipal sludge anaerobic digestion method |
| CN104531783B (en) * | 2015-01-01 | 2018-03-30 | 北京工业大学 | The method that copper sulphate joint alkaline pH promotes excess sludge anaerobic fermentation production short chain fatty acids |
| CN104531783A (en) * | 2015-01-01 | 2015-04-22 | 北京工业大学 | Method for promoting anaerobic fermentation of excess sludge by combining copper sulfate and alkaline pH to produce short-chain fatty acid |
| CN104862346A (en) * | 2015-05-04 | 2015-08-26 | 同济大学 | Method for increasing yield of short chain fatty acid produced with excess sludge through enzyme and alkali combined pretreatment |
| CN105177066A (en) * | 2015-09-02 | 2015-12-23 | 钟华 | Preparation method of short-chain fatty acid for deodorizing sewage and degrading sludge |
| CN105248883A (en) * | 2015-09-02 | 2016-01-20 | 钟华 | Method for degrading harmful residue in aquatic and poultry animal bodies by using short chain fatty acid |
| CN105063109A (en) * | 2015-09-02 | 2015-11-18 | 钟华 | Method for obtaining short-chain fatty acids by vegetable protein microbial fermentation |
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| CN109574434A (en) * | 2018-12-13 | 2019-04-05 | 上海交通大学 | A method of strengthening excess sludge anaerobic digestion methane phase using alkaloid |
| CN109574434B (en) * | 2018-12-13 | 2020-07-14 | 上海交通大学 | Method for producing methane by enhancing anaerobic digestion of excess sludge by using alkaloids |
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Application publication date: 20130619 |