CN104388479A - Method for producing short chain fatty acid by strengthening anaerobic fermentation of kitchen garbage - Google Patents
Method for producing short chain fatty acid by strengthening anaerobic fermentation of kitchen garbage Download PDFInfo
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Abstract
The invention discloses a method for producing short chain fatty acid by strengthening anaerobic fermentation of kitchen garbage, belongs to the field of resource utilization of wastes, and in particular relates to a method for producing short chain fatty acid from kitchen garbage by virtue of anaerobic fermentation to solve the problem that the conventional method for producing short chain fatty acid from the kitchen garbage is low in efficiency. The method for producing short chain fatty acid by virtue of anaerobic fermentation comprises the following steps: 1, collecting the kitchen garbage, removing oil slick, crushing by stirring, and adding water to obtain a mixed solution of the kitchen garbage; 2, performing ultrasonic pretreatment on the mixed solution of the kitchen garbage; and 3, inoculating excess sludge to the kitchen garbage after the ultrasonic pretreatment, and performing fermentation. By adopting the method disclosed by the invention, the short chain fatty acid is produced by strengthening the kitchen garbage by adopting a method combining ultrasonic pretreatment and S/I adjustment, so that more than 70% soluble organic substances in a fermented broth can be converted into short chain fatty acid. Meanwhile, the production cost and operation complexity are reduced, and the problem of treating fermentation remaining liquid containing high-concentration chemical reagents is solved.
Description
Technical field
The invention belongs to utilization of waste as resource field, be specifically related to utilize anaerobic fermentation of kitchen waste to produce the method for short chain fatty acid.
Background technology
Changing food waste is a kind of organic solid waste mainly resulting from food-processing industry, restaurant, dining room and family kitchen, its main moiety is the organic substances such as starch, foodstuff fibre, animal tallow, has high-moisture, high salinity, the feature such as high grease and perishable smelly, readily biodegradable.In the most cities of China, changing food waste constitutes the maximum integral part of municipal solid waste, accounts for 30% ~ 50% of municipal solid waste total amount.China changing food waste day output surprising, Beijing and Shanghai changing food waste day work output all more than 1000 tons.Up to the present, the most frequently used processing mode of China's changing food waste is sanitary landfill, but this processing mode not only can produce percolate and greenhouse gases, also can take a large amount of valuable land resources.Under the restriction of more and more stricter environmental legislation, sanitary landfill and some other conventional process methods of disposal, as ocean dissolve, burn, fodder and be used as fertilizer and prohibitted the use gradually.Therefore, seek a kind ofly can to realize changing food waste minimizing, processing mode that is innoxious and resource utilization is very urgent.
On the other hand, because changing food waste has the features such as the suitable and organic content of high-moisture, readily biodegradable, carbon-nitrogen ratio is abundant, the desirable substrate of anaerobically fermenting is become.By anaerobically fermenting, the most of organism in changing food waste can be converted into high value-added product, as short chain fatty acid, methane and hydrogen etc.Short chain fatty acid is a kind of carbon source be widely used, and may be used for the removal of sewage work's nitrogen phosphorus, produces bio-degradable plastics, synthesising biological gas and biofuel, and for electrogenesis etc.But present short chain fatty acid extracts mainly through chemosynthesis approach and obtains from fossil oil, and this method consumes Nonrenewable resources greatly, and make to produce the with high costs of short chain fatty acid.Therefore, produce short chain fatty acid by changing food waste and be a kind of ecological, environmental protective and economically viable method.Large quantity research shows that the key constraints of anaerobic fermentation of kitchen waste is dissolved and hydrolysing step, and the organism in fermented liquid must be in dissolved state, could be made full use of by microorganism.Meanwhile, the short chain fatty acid produced in anaerobic acidification process is very easily consumed by methanogen.Therefore, if to suppress or to reduce the consumption of methanogen to organism and short chain fatty acid while hydrolysis efficiency improving, the accumulation volume of short chain fatty acid will improve.
Owing to there is environmental sound and cracking the high feature of efficiency, ultrasonic wave is widely used in cracking sewage sludge as the efficient pretreatment mode of one, important effect has been played to the follow-up minimizing of mud and resource utilization, but it is also less to improve the research of short-chain fat acid yield for the pre-treatment of changing food waste.On the other hand, before about suppressing the research of methanogen activity to be nearly all regulate the pH in reactor to alkaline by dropping into chemicals, but this method is only effective under laboratory scale, problems can be caused in actual applications, production cost and the operation complicacy of such as short chain fatty acid can improve greatly, Wastewater treating difficulty containing high density chemical agent strengthens, and chemical agent suppresses acid-producing microorganisms growth and active generation.
Summary of the invention
The present invention will solve existing changing food waste and produce the not high problem of short chain fatty acid efficiency, provides a kind of and strengthens the method that anaerobic fermentation of kitchen waste produces short chain fatty acid.
The method that the present invention strengthens anaerobic fermentation of kitchen waste product short chain fatty acid follows these steps to realize:
One, collect changing food waste, after removing the oil slick of changing food waste, electricity consumption stirrer blends, and adds water and total solids level is transferred to 25 ~ 35g/L, obtain changing food waste mixed solution;
Two, changing food waste mixed solution is placed in reaction vessel, adjustment ultrasonic energy density is 1 ~ 1.25W/mL, carries out ultrasonic pretreatment 20 ~ 30min, obtain ultrasonic after changing food waste;
Three, step 2 is obtained ultrasonic after changing food waste put into anaerobically fermenting bottle, be 4 ~ 7 in the changing food waste after ultrasonic, inoculate excess sludge carry out fermentative processing according to changing food waste and the ratio (S/I) of excess sludge, complete anaerobic fermentation of kitchen waste and produce short chain fatty acid.
The method strengthening changing food waste that the present invention adopts ultrasonic pretreatment to combine S/I adjustment produces short chain fatty acid, due to the character of changing food waste and seed sludge, the pH of fermentation substrate is made to maintain 5 ~ 6.5, this scope is conducive to organic hydrolysis, acidifying and the activity of methanogen can be suppressed, water-insoluble organism loosely organized after ultrasonication is made to dissolve further and to be hydrolyzed, the larger molecular organicses such as deliquescent carbohydrate and protein are hydrolyzed to low molecular monose under the effect of microorganism and lytic enzyme, amino acid etc., these organism can be converted into short chain fatty acid by after the direct assimilation of microorganism, on the other hand, because the growth velocity of acid-producing bacteria is higher than methanogen, acid-producing bacteria promptly can be bred in the starting stage of fermentation, cause a large amount of accumulation of short chain fatty acid, so reduce the pH in reactor further, lower pH level makes the activity of methanogen be effectively suppressed in all stage of fermentation, thus farthest accumulates the output of short chain fatty acid.Utilizing the present invention to strengthen anaerobic fermentation of kitchen waste process can make the dissolved organic matter of in fermented liquid more than 70% be converted into short chain fatty acid.
By adjusting initial S/I, the pH of system in the character remote effect reactor utilizing changing food waste and seed sludge, make it maintain slightly acidic and consume the method for short chain fatty acid to suppress methanogen, the method killing methanogen by heating or add chemical agent than ever has a clear superiority in.Method of the present invention can not threaten and persecute, the therefore further stripping of undissolved organism the existence of hydrolysis and acid-producing microorganisms, and short chain fatty acid also can continue to produce; And reduce the cost and operation complicacy of producing short chain fatty acid, need not consider, containing the process problem of high density chemical reagent fermentation residual solution, also it can be recycled further.
The short chain fatty acid produced can be used for sewage work's nitrogen phosphorus removal, produce bio-degradable plastics, synthesising biological gas and biofuel and for electrogenesis etc.This invention not only achieves the minimizing, innoxious of changing food waste, also creates the great organic acid of utility value, achieves the recycling of changing food waste.
Accompanying drawing explanation
Fig. 1 be in the fermented liquid of embodiment anaerobically fermenting process resolvable chemical oxygen demand with the variation diagram of fermentation time, wherein
when representative is only with pretreated changing food waste fermentation, the resolvable chemical oxygen demand concentration in fermented liquid and the relation curve of fermentation time;
represent the relation curve of resolvable chemical oxygen demand concentration in embodiment one fermented liquid and fermentation time;
represent the relation curve of resolvable chemical oxygen demand concentration in embodiment two fermented liquid and fermentation time;
represent the relation curve of resolvable chemical oxygen demand concentration in embodiment three fermented liquid and fermentation time;
represent the relation curve of resolvable chemical oxygen demand concentration in embodiment four fermented liquid and fermentation time;
represent the relation curve of resolvable chemical oxygen demand concentration in embodiment five fermented liquid and fermentation time;
Fig. 2 is the variation diagram of fermented liquid Short-Chain Fatty Acids output with fermentation time of embodiment anaerobically fermenting process, wherein
when representative is only with pretreated changing food waste fermentation, the resolvable chemical oxygen demand concentration in fermented liquid and the relation curve of fermentation time;
represent the relation curve of embodiment one short-chain fat acid yield and fermentation time;
represent the relation curve of embodiment two short-chain fat acid yield and fermentation time;
represent the relation curve of embodiment three short-chain fat acid yield and fermentation time;
represent the relation curve of embodiment four short-chain fat acid yield and fermentation time;
represent the relation curve of embodiment five short-chain fat acid yield and fermentation time.
Embodiment
Embodiment one: the method that present embodiment strengthening anaerobic fermentation of kitchen waste produces short chain fatty acid follows these steps to implement:
One, collect changing food waste, after removing the oil slick of changing food waste, electricity consumption stirrer blends, and adds water and total solids level is transferred to 25 ~ 35g/L, obtain changing food waste mixed solution;
Two, changing food waste mixed solution is placed in reaction vessel, adjustment ultrasonic energy density is 1 ~ 1.25W/mL, carries out ultrasonic pretreatment 20 ~ 30min, obtain ultrasonic after changing food waste;
Three, step 2 is obtained ultrasonic after changing food waste put into anaerobically fermenting bottle, be 4 ~ 7 in the changing food waste after ultrasonic, inoculate excess sludge carry out fermentative processing according to changing food waste and the ratio (S/I) of excess sludge, complete anaerobic fermentation of kitchen waste and produce short chain fatty acid.
Present embodiment puies forward high acid amount by adjustment changing food waste with the ratio (S/I) of seed sludge, step 3 adjustment changing food waste is 5 ~ 6.5 with the pH of ratio (S/I) maintenance system of excess sludge, is beneficial to acidication and suppresses methanogen active.The method of this suppression methanogen is better than traditional interpolation pharmaceutical chemicals that passes through and regulates pH in large-scale practical application, and kills the mode of methanogen by heating etc.
The method of present embodiment anaerobic fermentation of kitchen waste adopts ultrasonic pretreatment associating S/I adjustment effectively can improve the hydrolysis efficiency of changing food waste, dissolved organic matter content in fermented liquid is significantly improved, is conducive to acid-producing microorganisms and is translated into short chain fatty acid; Meanwhile, the method for this combination treatment improves the speed of fermentation and acid, shortens and obtains the maximum time of producing acid amount, save energy and reduce the cost, decrease running cost.
Embodiment two: present embodiment and embodiment one regulate ultrasonic energy density to be 1W/mL unlike step 2, carry out ultrasonic pretreatment 20min.Other step and parameter identical with embodiment one.
Embodiment three: present embodiment and embodiment one or two are 13000 ~ 14000mg/L unlike the TS of the excess sludge inoculated in step 3, VS is 9000 ~ 9500mg/L, TCOD is 12000 ~ 13000mg/L, SCOD be 550 ~ 600mg/L, pH is 6.5 ~ 7.Other step and parameter identical with embodiment one or two.
Embodiment four: present embodiment and one of embodiment one to three are 6 carry out fermentative processing to seed sludge in the changing food waste after ultrasonic unlike step 3 according to changing food waste and the ratio (S/I) of excess sludge.Other step and parameter identical with one of embodiment one to three.
Embodiment five: one of present embodiment and embodiment one to four are to carry out in the water-bath of 35 ± 3 DEG C in constant temperature oscillator unlike the fermentative processing described in step 3.Other step and parameter identical with one of embodiment one to four.
Embodiment six: present embodiment and embodiment five are 48 ~ 72h unlike the time of fermentative processing in step 3.Other step and parameter identical with embodiment five.
Comparative Examples: the method that the present embodiment anaerobic fermentation of kitchen waste produces acid follows these steps to implement:
One, collect the changing food waste in Harbin Institute of Technology dining room, after removing the oil slick of changing food waste, electricity consumption stirrer blends, and adds water total solids level to be transferred to 30g/L, obtains changing food waste mixed solution;
Two, the changing food waste after 300mL oil removing is placed in reaction vessel, regulates ultrasonic energy density to carry out ultrasonic pretreatment 30min, obtain the changing food waste after cracking.
The present embodiment employing power is the probe type ultrasonic generator of 0 ~ 1200W.Changing food waste mixed solution 300mL is loaded in 500mL beaker, the probe of ultrasonic generator is inserted in mixed solution, regulate ultrasonic power, the ultrasonic energy density that changing food waste is received is respectively 0.25, 0.5, 0.75, 1 and 1.25W/mL, ultrasonic time is 30min, every 5min sampling, get 5mL at every turn and crack liquid, liquid is cracked all with the centrifugal 10min of 10000rpm rotating speed by all, crack liquid with 0.45 μm of metre filter changing food waste and obtain supernatant liquor, SCOD is measured with NACH DR1010COD determinator, with BCA kit measurement solvability protein, solvability carbohydrate content is measured with phend-sulphuric acid, with formula degree of cracking DD (%)=(SCOD
after-SCOD
0)/(TCOD
0-SCOD
0) × 100%, calculates the solubleness of changing food waste, wherein SCOD
afterfor cracking the content of SCOD in rear supernatant liquor, SCOD
0represent and crack SCOD content in front supernatant liquor, TCOD
0represent TCOD content in changing food waste mixed solution, test-results table 1, table 2.
Table 1
Table 2
As can be seen from Table 1, when using ultrasonic energy density 0.25 ~ 1.25W/mL to crack changing food waste, at ultrasonic front 20min, degree of cracking increases rapidly, and when continuing to increase ultrasonic time, degree of cracking is not significantly improved accordingly.Therefore the ultrasonic time of optimization is elected as 20min.When ultrasonic 20min, along with energy density rises to 1W/mL from 0.25W/mL, degree of cracking rises to 57.38% from 35.12%, and when further energization density, degree of cracking increase is not remarkable.As can be seen from Table 2, as supersound process 20min, the concentration of solvability carbohydrate and solvability protein increases rapidly along with the increase of ultrasonic energy density, almost reaches maximum when ultrasonic energy density is 1W/mL.At ultrasonic time 20min, during energy density 1W/mL, solvability carbohydrate and solvability protein concn are respectively than adding 171.21% and 132.25% during non-pre-treatment.After ultrasonic pretreatment, a large amount of dissolved organic matter is released in solution, more efficiently can be utilized by microorganism.Therefore, consider the degree of cracking to changing food waste and economic factors, using ultrasonic 20min and energy density 1W/mL as the ultrasonic pretreatment condition optimized.
Embodiment one: the method that the present embodiment strengthening anaerobic fermentation of kitchen waste produces short chain fatty acid follows these steps to implement:
One, collect the changing food waste in Harbin Institute of Technology dining room, after removing the oil slick of changing food waste, electricity consumption stirrer blends, and adds water total solids level to be transferred to 30g/L, obtains changing food waste mixed solution;
Two, changing food waste mixed solution is placed in reaction vessel, adjustment ultrasonic energy density is 1W/mL, carries out ultrasonic pretreatment 20min, obtain ultrasonic after changing food waste;
Three, step 2 is obtained ultrasonic after changing food waste put into anaerobically fermenting bottle, be 2 in the changing food waste after ultrasonic, inoculate excess sludge carry out fermentative processing according to changing food waste and the ratio (S/I) of excess sludge, complete anaerobic fermentation of kitchen waste and produce short chain fatty acid.
Wherein the changing food waste in dining room described in step one mainly comprises rice, noodles, vegetables and meat, is mixed to get according to volume 1:1:1 the changing food waste of morning, noon and afternoon breakfast, lunch and dinner.The total solids (TS) of the present embodiment changing food waste is 31788 ± 133.11mg/L, soluble solid (VS) is 29704 ± 102.56mg/L, total chemical oxygen demand (COD) (TCOD) is 62320 ± 233.12mg/L, resolvable chemical oxygen demand (SCOD) is 31400 ± 142.53mg/L, solvability carbon water chemistry thing is 7061 ± 115.12mg/L, solvability protein is 2453 ± 75.33mg/L, and initial pH is 5.13 ± 0.21.
Anaerobically fermenting process described in the present embodiment step 3 is at 180rpm, carries out in the water-bath of 35 ± 1 DEG C.The S/I of changing food waste and seed sludge is 2 (in volatile solids), this tests the excess sludge that seed sludge used derives from Wenchang, Harbin City sewage work, the TS of this excess sludge is 13381 ± 238.51mg/L, VS is 9255 ± 71.33mg/L, TCOD is 12110 ± 216.74mg/L, SCOD is 572 ± 23.35mg/L, pH is 6.96 ± 0.14.
Embodiment two: to be 4 (in volatile solids) unlike step 3 according to changing food waste and the ratio (S/I) of excess sludge carry out fermentative processing to seed sludge in the changing food waste after ultrasonic for the present embodiment and embodiment one.Other step and parameter identical with embodiment one.
Embodiment three: the present embodiment and embodiment one carry out fermentative processing unlike being 6 (in volatile solids) according to changing food waste and the ratio (S/I) of excess sludge to seed sludge in the changing food waste after ultrasonic.Other step and parameter identical with embodiment one.
Embodiment four: the present embodiment and embodiment one carry out fermentative processing unlike being 8 (in volatile solids) according to changing food waste and the ratio (S/I) of excess sludge to seed sludge in the changing food waste after ultrasonic.Other step and parameter identical with embodiment one.
Embodiment five: the present embodiment and embodiment one carry out fermentative processing unlike being 10 (in volatile solids) according to changing food waste and the ratio (S/I) of excess sludge to seed sludge in the changing food waste after ultrasonic.Other step and parameter identical with embodiment one.
The present embodiment employing power is the probe type ultrasonic generator of 0 ~ 1200W.The changing food waste after 0.45 μm of metre filter anaerobically fermenting is used to obtain supernatant liquor, SCOD is measured with NACH DR1010COD determinator, with BCA kit measurement solvability protein, solvability carbohydrate content is measured, with formula degree of cracking DD (%)=(SCOD with phend-sulphuric acid
after-SCOD
0)/(TCOD
0-SCOD
0) × 100%, calculates the solubleness of changing food waste, wherein SCOD
afterfor the content of SCOD in supernatant liquor, SCOD
0represent and crack SCOD content in front supernatant liquor, TCOD
0represent TCOD content in changing food waste mixed solution, test-results as depicted in figs. 1 and 2.
The present embodiment characterizes the hydrolysis degree of changing food waste with the concentration of resolvable chemical oxygen demand in fermented liquid.The output of short chain fatty acid is with chemical oxygen demand gauge.As can be seen from Fig. 1 and Fig. 2, as S/I=4 and 6, compared with other S/I situations, resolvable chemical oxygen demand is improved largely, 1403.7mg/gVS is reached time maximum, be 1.61 times before fermentation, illustrate through ultrasonic pretreatment and adjust when initial S/I is 4 and 6 and effectively promote insoluble organic dissolving and hydrolysis, organic content in solution is improved greatly; Also there is rapid growth in the output of short chain fatty acid simultaneously, and production peak appears at S/I=6, during fermentation time 48h, produces acid amount for 967.12mg COD/g-VS.Illustrate that this combination treatment not only increases the output of short chain fatty acid, also improve rate of producing acid.Under the condition of ultrasonic pretreatment associating S/I=6, the dissolved organic matter of 72.27% in fermented liquid, is had to be converted into short chain fatty acid.
The raising that the present embodiment produces acid amount is because ultrasonic pretreatment and suitable S/I value effectively promote organic further hydrolysis, and under S/I=6, keeping in reactor pH between 5.3 and 6.3, this is enough to suppress methanogen to organism and the consumption of short chain fatty acid that produced.After ultrasonic disintegration, obtain the maximum fermentation time produced when acid is measured and be advanced by 24h compared with without during pre-treatment, the fermentation time of shortening can be avoided having produced acid by microbial consumption, and plays an important role for reducing energy consumption in practical application.
In sum, combining ultrasonic pre-treatment and S/I optimize and revise the accumulation that not only effectively can promote short chain fatty acid, can also shorten fermentation time.Also should note simultaneously, no matter whether carry out ultrasonic pretreatment and S/I adjustment, long fermentation time is all unfavorable for the accumulation of short chain fatty acid, because organic hydrolysis reaches maximum in the early stage of fermentation in changing food waste, and produce acid because methanogenic speed is slower than, therefore fermentation can make the short chain fatty acid produced be consumed by methanogen and produce methane for a long time.
Claims (6)
1. strengthen the method that anaerobic fermentation of kitchen waste produces short chain fatty acid, it is characterized in that following these steps to realize:
One, collect changing food waste, after removing the oil slick of changing food waste, electricity consumption stirrer blends, and adds water and total solids level is transferred to 25 ~ 35g/L, obtain changing food waste mixed solution;
Two, changing food waste mixed solution is placed in reaction vessel, adjustment ultrasonic energy density is 1 ~ 1.25W/mL, carries out ultrasonic pretreatment 20 ~ 30min, obtain ultrasonic after changing food waste;
Three, step 2 is obtained ultrasonic after changing food waste put into anaerobically fermenting bottle, be 4 ~ 7 in the changing food waste after ultrasonic, inoculate excess sludge carry out fermentative processing according to changing food waste and the ratio of excess sludge, complete anaerobic fermentation of kitchen waste and produce short chain fatty acid.
2. a kind of method strengthening anaerobic fermentation of kitchen waste product short chain fatty acid according to claim 1, is characterized in that step 2 regulates ultrasonic energy density to be 1W/mL, carries out ultrasonic pretreatment 20min.
3. a kind of method strengthening anaerobic fermentation of kitchen waste product short chain fatty acid according to claim 1, it is characterized in that the TS of the excess sludge inoculated in step 3 is 13000 ~ 14000mg/L, VS is 9000 ~ 9500mg/L, TCOD is 12000 ~ 13000mg/L, SCOD is 550 ~ 600mg/L, pH is 6.5 ~ 7.
4. a kind of anaerobic fermentation of kitchen waste of strengthening according to claim 1 produces the method for short chain fatty acid, it is characterized in that step 3 is 6 carry out fermentative processing to seed sludge in the changing food waste after ultrasonic according to changing food waste and the ratio of excess sludge.
5. a kind of method strengthening anaerobic fermentation of kitchen waste product short chain fatty acid according to claim 1, is characterized in that the fermentative processing described in step 3 is to carry out in the water-bath of 35 ± 3 DEG C in constant temperature oscillator.
6. a kind of method strengthening anaerobic fermentation of kitchen waste product short chain fatty acid according to claim 5, is characterized in that the time of fermentative processing in step 3 is 48 ~ 72h.
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| CN110862207A (en) * | 2019-11-28 | 2020-03-06 | 湖南大学 | Method for promoting degradation of capsaicin in kitchen waste and simultaneously producing methane |
| CN112390487A (en) * | 2020-10-29 | 2021-02-23 | 辽宁大学 | Method for strengthening kitchen waste and sludge cooperative anaerobic digestion through ultrasonic pretreatment |
| CN113264588A (en) * | 2021-06-02 | 2021-08-17 | 知和环保科技有限公司 | Composite carbon source for sewage treatment |
| CN114107406A (en) * | 2021-11-08 | 2022-03-01 | 北京工业大学 | Method for strengthening acid production by co-digestion of kitchen waste and activated sludge through ultrasonic/temperature pretreatment |
| CN114350719A (en) * | 2021-12-10 | 2022-04-15 | 同济大学 | Method for producing acetic acid by enhancing fermentation of high-reducing sugar wet organic waste |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109942084A (en) * | 2019-03-04 | 2019-06-28 | 西安建筑科技大学 | A kind of device and method of kitchen garbage joint rural domestic sewage treatment |
| CN109942084B (en) * | 2019-03-04 | 2023-10-20 | 西安建筑科技大学 | Kitchen waste combined rural domestic sewage treatment device and method |
| CN110862207A (en) * | 2019-11-28 | 2020-03-06 | 湖南大学 | Method for promoting degradation of capsaicin in kitchen waste and simultaneously producing methane |
| CN110862207B (en) * | 2019-11-28 | 2021-10-26 | 湖南大学 | Method for promoting degradation of capsaicin in kitchen waste and simultaneously producing methane |
| CN112390487A (en) * | 2020-10-29 | 2021-02-23 | 辽宁大学 | Method for strengthening kitchen waste and sludge cooperative anaerobic digestion through ultrasonic pretreatment |
| CN113264588A (en) * | 2021-06-02 | 2021-08-17 | 知和环保科技有限公司 | Composite carbon source for sewage treatment |
| CN114107406A (en) * | 2021-11-08 | 2022-03-01 | 北京工业大学 | Method for strengthening acid production by co-digestion of kitchen waste and activated sludge through ultrasonic/temperature pretreatment |
| CN114350719A (en) * | 2021-12-10 | 2022-04-15 | 同济大学 | Method for producing acetic acid by enhancing fermentation of high-reducing sugar wet organic waste |
| CN114350719B (en) * | 2021-12-10 | 2023-08-08 | 同济大学 | Method for producing acetic acid by enhancing fermentation of wet organic waste with high reducing sugar |
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