CN1071899A - Corn starch wastewater two-stage fermentation facture and equipment thereof - Google Patents
Corn starch wastewater two-stage fermentation facture and equipment thereof Download PDFInfo
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Abstract
The present invention relates to corn starch wastewater two-stage fermentation facture and equipment thereof.The present invention carries out two-stage fermentation by the two-stage up flow anaerobic sludge blanket reactor to the high concentration corn starch water of sulfur-bearing hydrochlorate and sulphite and handles, make concentration height in the II level UASB reactor, methane coccus content many and sophisticated mud is back in the I level UASB reactor, from and improved the processing power of I stage reactor, and reduce and add alkali number.The COD clearance 90-93% of the inventive method and equipment thereof, the COD cubic capacity reaches 14-20kg/m
3D, the factor of created gase height has quite high economic benefit and social benefit.
Description
The present invention relates to field of waste water treatment, particularly the two-stage fermentation method and the equipment thereof of anaerobic biological treatment corn starch wastewater.
The high-concentration waste water anaerobic treatment is in the development and use stage both at home and abroad, particularly Holland, (wheat starch) is fairly large is applied in the industrial production in Ireland, but during with upflow anaerobic sludge blanket process (UASB), its organic loading is all lower, general 7～9kg COD/m
3D(COD is a chemical oxygen demand (COD)).When the U.S. handles waste water in the potato processing industry, though the organic loading height reaches 25～40kg COD/m
3D, but the COD clearance only is 84%.In China Guangzhou Energy Resource Inst., Chinese Academy of Sciences molasses water has been carried out two phase anaerobic digestion industrial experimentation, its organic loading is 10kg COD/m
3D, factor of created gase are 3.48m
3/ m
3D, COD clearance are 77.8%, and the liquid total residence time reaches 3.33 days.Japanese Patent Application Laid-Open is flat-and 2-111408 discloses a kind of being reduced in and adjusted the method for pH with alkali in the methane fermentation, this method adopts two sections up flow anaerobic sludge blanket reactors, but do not take the mud reflux technique, thereby can not guarantee the activity and the concentration of mud, it is higher to add alkali number simultaneously, therefore, TOC(total organic carbon amount) and the BOD(biochemical oxygen demand (BOD)) clearance only about 75%.Between its second reactor, be provided with the membrane type tripping device, to strengthen gas separation effect, make in the methane groove, can not handle in addition in this groove unwanted component separating go out, make then and return the acid-fermentation groove, this membrane type tripping device equipment cost is higher.The handled sewage pH of this patent application value is very not low, and it is quite a few to add alkali number, and its factor of created gase has only about 3N1/1 in addition.
In addition, the anaerobic fermentation method that US 4948509 is announced is a two-section treatment, is made up of anaerobic fermentation reactor and floating trough.Adopt the power machine stirring method at reactor lower part, thereby increase energy consumption and cost; In floating trough, adopt vapour under the state of nature, liquid, solid separate mode, the strict control of this operational requirement, otherwise be easy to generate the blister crust, exhaust problem or obstruction, sometimes even the danger of equipment explosion occurs; Do not have mud to reflux between two sections, simultaneously handled is general sewage, rather than contains the vitriol of difficult degradation and the high concentration starch water of sulfite, need not add alkali.
SU 912682 discloses a kind of degasification and refining plant of high-concentration sewage, and equipment used is not flow lifting type anaerobic reactor but baffled reactor, and this device volume is big, sewage residence time in reactor is long, the initial cost height does not have mud backflow measure yet, and inconvenient maintenance.
US 4735723 has announced containing vitriol and organic anaerobic waste water method of purification, equipment therefor is testing laboratory's small testing device of 1000 milliliters, its purpose is 80% vitriol in the sewage is transformed into hydrogen sulfide, and remove 70% of hydrogen sulfide amount at least, with adding acid rather than adding alkali, be fluidized-bed process rather than flow lifting type Sludge Bed technology, it is big to consume kinetic energy, the cost of business operation height.
For corn starch wastewater, contain organic substrate concentration height, and owing to contain vitriol and sulphite, the pH value of waste water is generally 3.8～4.5, and the growth conditions of methane coccus for this reason, must add the pH value that alkali is regulated waste water generally at neutral and meta-alkalescence scope such as pH 7.0～7.5, general industry is higher with alkali such as yellow soda ash price, and reduction adds alkali number and could reduce cost for wastewater treatment.
The object of the invention is: a kind of two-stage fermentation facture and device thereof of handling corn starch wastewater is provided, in order to handle the corn starch wastewater of sulfur-bearing hydrochlorate and sulphite, this method and apparatus can improve the organism volumetric loading of anaerobic reaction, improve sewage treating efficiency, shorten the residence time and the minimizing of waste water in reaction and add alkali number, reduce processing cost.
The present invention seeks to realize like this: in two-stage fermentation is handled, mud refluxes to I level UASB reactor to make II level UASB reactor ferment preferably, be provided with triphase separator on every UASB reactor top, waste water enters behind the UASB reactor bottom by the average water distribution of water distributing pipe that has the comb of boring a hole, on the water surface of UASB reactor top, be provided with the pressure bounce-back device, prevent the scum silica frost crust, thereby the object of the invention has just reached fully.
The present invention is described in detail below in conjunction with drawings and Examples.
Two groups of fermentations of corn starch wastewater of the present invention flow process is seen accompanying drawing 1.
Accompanying drawing 2 is up flow anaerobic sludge blanket reactor (UASB) structural representation.
Accompanying drawing 3 is the II-II place water distributing pipe sectional view of accompanying drawing 2.
Accompanying drawing 4 is the sectional view of the III-III place pressure bounce-back device of accompanying drawing 2.
Accompanying drawing 5 is water distributing pipe and pressure bounce-back device cross sectional representation.
The water quality of the handled cornstarch processing waste water of the present invention is as follows:
| Project | General range | Mean value |
| Water temperature pH value basicity Mg/L | 6～15℃ 3.8～4.5 390～1390 | 10.2℃ 4.2 1000 |
| Project | General range | Mean value |
| The COD(COD) mg/L BOD (BOD) mg/L TN(total organic nitrogen) mg/L TP(total organic phosphorus) mg/L volatile acid mg/L sulphite mg/L sulfate mg/L free ammonia mg/L reduced sugar mg/L total solid % | 3000～140000 1860～62600 106～320 29.6～95.8 206～652 102～139 62～124 20～40 0.7～10.1 1.5～4.4 | 25000 14500 291 62.5 508 108 96.6 34.2 6.3 1.8 |
Since the organic concentration height of handled corn starch wastewater, and contain sulphite and vitriol, its pH value is generally 3.8～4.5, and such waste water is unsuitable for the growth of methane coccus.The growth conditions of methane coccus is generally at neutrality and meta-alkalescence, the pH value is 7.0～7.5 to be advisable, for this reason, the pH value of waste water must be regulated, promptly alkali need be added, institute adds alkali, and for example the industrial sodium carbonate price is higher, reduce one of approach that adds alkali number minimizing cost for wastewater treatment, when upflow anaerobic sludge blanket process (UASB) reactor for treatment waste water, waste water enters from reactor bottom, often inhomogeneous and insufficient owing to contacting with mud, thus fermentation efficiency is not high; With secondary or two sections UASB reaction treatment waste water the time, liquid phase (waste water), gas phase (sulfurous gas of generation and carbonic acid gas etc.) and the equipment that often need use complexity or costliness separating of solid phase (as mud), for example how membrane separation apparatus etc. adopts the equipment of simple and inexpensive also can save the capital construction cost.
From accompanying drawing 1 as seen, corn starch wastewater is raised pump 2 by water collecting basin 1 and squeezes in the distribution reservoir 3, in this distribution reservoir, with steam the waste water water temperature is brought up to middle temperature, reach 35 ℃ ± 1 ℃, add small amount of alkali simultaneously, the pH value of waste water is adjusted to about 5.0, after fully stirring, react 7 bottoms by sending into I level UASB with the pump 5 that feeds intake of the time relay 4 controls, measure flow by wastewater flow meter 6 therebetween, the waste water that enters I level UASB reactor 7 is evenly distributed to the sludge blanket bottom by the water distributing pipe 71 of tape punching comb, its objective is for make the firm waste water that enters reactor immediately with the mud uniform mixing, improve fermentation efficiency, the more important thing is like this and can reduce the mud background layer, general mud background layer in reactor is between 0.8～1.5 meter, and this water distribution mode can drop to below 0.5 meter, reduced the height of equipment like this, also just reduce equipment manufacturing cost, also improve the sludge concentration in the reaction simultaneously, also promptly improve organic matter of sewage volumetric loading, promptly improve the organic cod (chemical oxygen demand (COD)) that the unit equipment volume can bear as the sewage disposal important indicator.Waste water ferments in I level UASB reactor, the gases such as methane that produced are discharged from air outlet d3 by triphase separator, distributing trough 8 in the middle of waste water is flow to by water outlet d2, in this groove, add small amount of alkali again, the pH value is adjusted to about 6.8, make this waste water through the pump 9 that feeds intake by time relay control be admitted to I level UASB structure of reactor and the on all four II level of size UASB reactor 10 in, waste water is finally flowed out by top water outlet d2 behind the fully fermenting in II level UASB reactor, and the residence time of waste water in two reactors is 30～40 hours.Respectively be provided with identical triphase separator on two UASB reactor tops, this triphase separator is by folded fundus gallbladder and be located at the baffle ring that UASB reactor wall, cross section be M shape and constitute, the folded fundus gallbladder base angle is in the baffle ring M shape neutral gear, gas does not pass through in neutral gear, but upwards flow along folded fundus gallbladder, discharge by vapor pipe d3., discharge then by the crooked neutral gear between folded fundus gallbladder base angle and baffle ring through the waste water after the fermentation by water outlet d2.Mud in the reactor returns in the reactor at the folded fundus gallbladder outside slip owing to the proportion cause, thereby three-phase is separated.Because gas and waste water upwards flow, and are with a little dirt foams unavoidably, blocked for fear of water outlet, the 20cm place is provided with pressure bounce-back device 75 on the water surface, and waste water is jetted, and prevents that water outlet is blocked.The biogas that is produced is discharged to the gas system that uses by top vapor pipe d3, for example water seal 11, gas-accumulating tank, gas booster compressor etc.Returned sluge is to be back in the I level UASB reactor 7 by II level UASB reactor 10 middle parts outlet d6 and conduit on the upper side.
Above technology is under 35 ℃ of conditions, and when water inlet COD concentration was 15000～25000mg/L, retention time of sewage was 30～40 hours, COD cubic capacity load 14～20kg/m
3D, the COD clearance can reach 90～93%, and average factor of created gase is 0.42～0.47m
3/ kg COD, methane content are 65～72%.
For containing the processing that vitriol and sulphite, pH value are 3.8～4.5 corn starch wastewater, adopt the second order fermentation method particularly to make and ferment better, contain the more and sophisticated mud of methanobacteria in the II stage reactor, solved problem well to the backflow of I stage reactor.General I level fermentation is insufficient, and II stage reactor mud is back to the anaerobic condition that has improved the I stage reactor in the I stage reactor, improves the efficient of one grade fermemtation, reduces to add alkali number, thereby improves the COD clearance.The mud quantity of reflux is decided according to COD concentration in the waste water, is generally 10～15(weight of wastewater flow rate in the UASB reactor) %.
The inventive method equipment used is as follows:
The inventive method equipment used is the improvement of prior art, and equipment used comprises distribution reservoir, and middle distribution reservoir etc., its key equipment are identical I level of structure and size and II level upflow anaerobic sludge blanket process (UASB) reactor.Being provided with at least one the distribution reservoir 3 of being heated and being stirred by steam before the I order reaction is answered device 7, is the example that is provided with two distribution reservoirs in accompanying drawing 1, distributing trough 8 in the middle of being provided with between I stage reactor 7 and II stage reactor 10.Said I level and II level UASB reactor are rounded, and small-sized person's height is 6～4: 1 to diameter proportion, to keep the reactor elongated form, help holding the mud of desired height and promote fermentation reaction; Large-scale person guarantees that height 4～6 rice diameters do not limit, and reason all is the height that guarantees that sludge blanket has, and makes waste water from bottom to top in the flow process, under the effect of granule sludge, and fully fermentation.
In order to make the abundant and uniform contact of waste water and mud, adopt the water distributing pipe 71 of water distribution uniformity tape punching comb at reactor lower part, this Guan Youyi root water inlet straight tube d1 has one group of parallel comb with both wings and forms with the vertical water distribution straight tube of this water inlet straight tube, on each comb, be provided with a plurality of holes 72, the diameter of section in this hole is 6～12mm, be divided into 6mm between the Kong Yukong, the downward 45 ° of arrangements that interlock of each hole.Water distributing pipe 71 effects with this spline structure are fine, see accompanying drawing 3 and 5, wherein accompanying drawing 3 is UASB reactor II-II sectional views on the accompanying drawing 2, demonstrates water distributing pipe 71 comb distribution situations, and accompanying drawing 5 be on the accompanying drawing 3 shown in the sectional view in hole 72, the position of this pore 72 is downward 45 °.
In order to make the waste water of handling, solid such as methane gas and mud fully separates, be provided with triphase separator on each UASB reactor top, this triphase separator is by folded fundus gallbladder 74 and be located at the UASB reactor wall, the cross section is the baffle ring 76 of M shape and forms, the folded fundus gallbladder base angle is in the baffle ring M shape neutral gear, this folded fundus gallbladder bottom inclination alpha is 50～60 °, the M type cross section bezel facet of baffle ring is parallel with waist at the bottom of this turbination, and mud therebetween refluxes and stitches width α is 5～10cm, large-scale reactor can reach 20cm, distance between the bimodal end of M tee section of baffle ring and the folded fundus gallbladder base angle point on the reactor longitudinal direction is b=5～20cm, vertically is provided with vapor pipe d3 in the triphase separator upper end.
Stop up water outlet d2 for fear of the mud foam, the 20cm place is provided with pressure bounce-back pipe 75 on the water surface, send into by the water-in d5 water that will recoil, see accompanying drawing 2 and accompanying drawing 4, accompanying drawing 4 is accompanying drawing 2 III-III sectional views, is provided with a plurality of holes on this ring pipe, this hole diameter of section is 6～12mm, between the Kong Yukong apart from being 6mm, the downward 45 ° of arrangements that interlock of each hole, identical with the hole 72 of accompanying drawing 5 water distributing pipes 71.Recoil water is (circuit is not drawn) of squeezing into from the pump 9 of middle distributing trough 8.
For the mud of obtaining different levels with add the alkali position, sidewall at reactor is provided with a plurality of mouth of pipe d6, it in accompanying drawing 2 example of establishing 5 mouths of pipe, with the mouth of pipe of high slightly in the middle part of an II stage reactor mouth of pipe d6 as the mud backflow, because the mud at this place is to contain the many and mud of fermenting-ripening of methanobacteria, just can improve the condition of fermenting in the I stage reactor after being back to the I stage reactor.The route that mud refluxes shown in accompanying drawing 1 dotted line from the d6 mouth of pipe to distribution reservoir after and before the pump 5.
Be provided with thermometer hole 73 at the reactor middle part.
The inventive method and equipment have many advantages:
Mud refluxes and can not only improve the basicity of I stage reactor waste water, reduce and add alkali number, its pH value is brought up to about 5.0 by original 3.8～4.5, the more important thing is, improve sludge concentration, methane coccus growth of micelles speed is increased sharply, thereby improve the activity of anaerobic sludge in the I stage reactor, improve the wherein flocculating property of mud, therefore, the COD treatment effect of I stage reactor is brought up to more than 75%, and this just alleviates the volumetric loading of II stage reactor, finally makes total clearance of COD reach 90～93%.
The inventive method and equipment thereof also have following advantage: the high concentration starch water with the high concentration corn starch water of the inventive method and device processes sulfur-bearing hydrochlorate and sulphite and other difficult dilution has bigger popularizing application prospect, and it has less investment, occupation of land is little, running expense is low superiority than any other sewage water treatment method.When adopting this technology for the high concentration corn starch water of sulfur-bearing hydrochlorate and sulphite, after granular sludge, at low temperature (18 ℃) but, all steady running under the condition of change rapidly of low basicity and load, and also can comparatively fast start after stopping transport.The anaerobic reaction thing volumetric loading height of the inventive method, sewage treating efficiency height, the waste water residence time in reactor is short, and it is few to add alkali number, and it can make corn starch wastewater become bioenergy biogas, and promptly 100kg COD can produce methane 31m
3, being equivalent to the electric energy of 84KW, China's corn starch wastewater total release surpasses 300,000,000 tons every year at present, can produce methane 9300m by this estimation
3, be equivalent to annual 19 hundreds of millions degree generated energy, therefore, the inventive method and equipment have suitable remarkable economic efficiency and social benefit.
Embodiment:
Interim test adopts two structures and big or small on all four UASB reactor respectively as I level and II level UASB reactor, this steel reactor φ 130mm, and high 4.55m, test moves 330 days continuously, 3460 of measured datas.
1) test water quality: identical with used water quality in the specification sheets.
2) add the relation such as the following table of alkali number and flow:
More than adding alkali number unit is kg/day, and pH value is transferred to 5.0 from 4.3 in the I stage reactor, is transferred to 6.8 from 6.5 in the II stage reactor, and adding alkali number increases with flow velocity, adds alkali number greater than the II stage reactor in the I stage reactor.
3) the UASA I stage reactor waste water relation (former water) that adds alkali number and pH value is as following table:
The relation that more than adds between alkali number and the pH value can be represented by following formula:
C＝1718.85PH
-1.150208
4) to add the relation (waste water) of alkali number and pH value as follows for UASB II stage reactor waste water:
C＝4187.5PH
-2.14097
Can find out that from last table under the constant situation of treatment effect, the II stage reactor adds alkali number can reduce 80～85%, this stage biogas composition is with CH
4, CO
2Be main, and small amount of H is arranged
2S, measurement result such as following table:
In the II order reaction stage owing to add alkali, sludge character also is better than the test initial stage, when examining under a microscope, see that microorganism is very active, be interweaved together, shape such as netted forms grain pattern, coccus and tyrothricin are more, and naked eyes also can be told granule sludge from the Semen Maydis powder of mud.
6) along journey sludge concentration distribution feelings such as following table:
The pilot plant test result is: under 35 ℃ of conditions, and about water inlet COD concentration 25000mg/L, hydraulic detention time 30～40 hours, COD cubic capacity 14～20kg/m
3D, wherein the I stage reactor is 20～30kgCOD/m
3D; The II level is 8～15kgCOD/m
3D, the COD clearance reaches more than 90%, and average gas production rate is 0.42～0.47m
3/ kgCOD, methane content 65～72%.
Claims (3)
1, corn starch wastewater two-stage fermentation facture, with two structures and the identical upflow anaerobic sludge blanket process of size (UASB) reactor, said waste water is brought up to 35 ℃ ± 1 ℃ with steam with water temperature and is also stirred in distribution reservoir, add alkali, after making its pH value bring up to about 5.0, in I level UASB reactor, ferment, distributing trough in the middle of waste water after the fermentation is flowed into by the top water outlet, in this groove, add alkali, the waste water pH value is reached about 6.8, introduce II level UASB reactor from the bottom, and fully fermenting therein, it is characterized in that:
A) II level UASB reactor ferments, and mud is to the backflow of I level UASB reactor preferably, and the mud quantity of reflux is 10～15 (weight) % of wastewater flow rate in the UASB reactor;
B) be provided with by the inverted cone cap on every UASB reactor top and be located at the triphase separator that baffle ring constituted that UASB reactor wall, cross section are M shape, water, gas phase and solid matter are separated;
C) waste water enters behind the UASB reactor bottom by the average water distribution of the water distributing pipe of tape punching comb;
D) on the water surface of UASB reactor top, be provided with the pressure bounce-back pipe,, prevent that sewage outlet is blocked water surface solids or foam winding-up.
2, the said corn starch wastewater two-stage fermentation of claim 1 method equipment used is made up of distribution reservoir, middle distributing trough, two structures and the identical upflow anaerobic sludge blanket process of size (UASB) reactor, it is characterized in that:
A) said I level and II level UASB reactor, it is 6～4: 1 to the diameter ratio highly for small-sized person; Large-scale person is 4～6 meters highly, and diameter is not limit;
B) be respectively equipped with a plurality of conducts two UASB reactor one sides and measure mud and add the mouth of pipe of alkali, with at II level UASB reactor middle part this mouth of pipe on the upper side as the mud return line mouth, mud is sent in the I level UASB reactor from II level UASB reactor;
C) be provided with triphase separator on every UASB reactor top, said triphase separator is by folded fundus gallbladder and be located at the UASB reactor wall, the baffle ring that the cross section is M shape constitutes, the folded fundus gallbladder base angle is in the baffle ring M shape neutral gear, this folded fundus gallbladder isosceles bottom inclination alpha is 50～60 °, the M type cross section bezel facet of baffle ring is parallel with waist at the bottom of this turbination, and mud therebetween refluxes and stitches width α is 5～10cm, large-scale reactor can reach 20cm, between the bimodal end of M tee section and folded fundus gallbladder base angle point of shelves ring, distance on the reactor longitudinal direction is b=5～20cm, vertically is provided with vapor pipe in the triphase separator upper end;
D) have the water distributing pipe of tape punching comb at reactor, this water distributing pipe has one group of parallel comb by a water inlet straight tube with both wings and forms with the vertical water distribution straight tube of this water inlet straight tube, is provided with a plurality of holes on each comb;
E) the 20cm place is provided with the pressure bounce-back pipe on the UASB reactor water surface, and this is managed ringwise, is provided with a plurality of holes on this ring pipe;
3, according to the said equipment of claim 2, it is characterized in that: at d) and e) in said hole, its diameter of section is 6～12mm, between the Kong Yukong apart from being 6mm, the downward 45 ° of arrangements that interlock of each hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92113532A CN1032586C (en) | 1992-12-03 | 1992-12-03 | Process and apparatus for two-stage fermentation of corn starch contg.waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92113532A CN1032586C (en) | 1992-12-03 | 1992-12-03 | Process and apparatus for two-stage fermentation of corn starch contg.waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1071899A true CN1071899A (en) | 1993-05-12 |
| CN1032586C CN1032586C (en) | 1996-08-21 |
Family
ID=4946457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92113532A Expired - Fee Related CN1032586C (en) | 1992-12-03 | 1992-12-03 | Process and apparatus for two-stage fermentation of corn starch contg.waste water |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095386C (en) * | 1998-01-14 | 2002-12-04 | 中山大学 | Method for producing fire extinguishing agent using fermentation industrial waste water |
| CN105886331A (en) * | 2016-04-29 | 2016-08-24 | 桂林电子科技大学 | Integrated treatment system applicable to recycling household garbage |
| CN108504698A (en) * | 2018-05-14 | 2018-09-07 | 同济大学 | Improve the method that amylopectin is biologically converted into butyric acid in open system in organic wastewater |
| EP2821372B1 (en) * | 2012-03-02 | 2020-05-20 | G-Meta Consultoria, Paticipações e Serviços Ltda. | Anaerobic process for producing biogas with a high methane content by means of the biodigestion of organic waste |
| CN114426375A (en) * | 2021-12-21 | 2022-05-03 | 深圳粤鹏环保技术股份有限公司 | Food production wastewater treatment method |
-
1992
- 1992-12-03 CN CN92113532A patent/CN1032586C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095386C (en) * | 1998-01-14 | 2002-12-04 | 中山大学 | Method for producing fire extinguishing agent using fermentation industrial waste water |
| EP2821372B1 (en) * | 2012-03-02 | 2020-05-20 | G-Meta Consultoria, Paticipações e Serviços Ltda. | Anaerobic process for producing biogas with a high methane content by means of the biodigestion of organic waste |
| US11085058B2 (en) * | 2012-03-02 | 2021-08-10 | G-Meta Consultoria, Participações E Serviços Ltda | Anaerobic process for producing biogas with a high methane content by means of the biodigestion of organic waste |
| CN105886331A (en) * | 2016-04-29 | 2016-08-24 | 桂林电子科技大学 | Integrated treatment system applicable to recycling household garbage |
| CN108504698A (en) * | 2018-05-14 | 2018-09-07 | 同济大学 | Improve the method that amylopectin is biologically converted into butyric acid in open system in organic wastewater |
| CN114426375A (en) * | 2021-12-21 | 2022-05-03 | 深圳粤鹏环保技术股份有限公司 | Food production wastewater treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032586C (en) | 1996-08-21 |
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