CN108946957A - A method of polyurethane and hydrotalcite compound collecting short chain fatty acids are prepared into slow release carbon source - Google Patents
A method of polyurethane and hydrotalcite compound collecting short chain fatty acids are prepared into slow release carbon source Download PDFInfo
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- CN108946957A CN108946957A CN201810766821.4A CN201810766821A CN108946957A CN 108946957 A CN108946957 A CN 108946957A CN 201810766821 A CN201810766821 A CN 201810766821A CN 108946957 A CN108946957 A CN 108946957A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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Abstract
The invention discloses a kind of methods by polyurethane and hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source.This method, which will solve current conventional liquid carbon source, to be existed vulnerable to water inlet influence of fluctuations, dosage is difficult to control, cause to be easy the problem of influencing effluent quality, it is intended to by using polyurethane/hydrotalcite composite material as timbering material, using the short chain fatty acids in sludge fermentation liquid as the new process of the controllable easily recycling slow release carbon source of carbon source preparation, so that become more efficient, economical in terms of the biological treatments efficiency such as sewage nutrient removal and flue gas desulfurization and denitrification, it is significant to ecological safety and Sustainable Socioeconomic Development.Method: one, sludge sample is prepared；Two, thermokalite method pretreating sludge sample preparation short chain fatty acids；Three, ultrasonic wave added method prepares Ca/Al hydrotalcite material；Four, a step foaming prepares polyurethane/hydrotalcite compound support frame material；Five, controllable sustained-release carbon source is prepared into using the short chain fatty acids in compound support frame material adsorbing and extracting sludge fermentation liquid.
Description
Technical field
This method is related to a kind of method by polyurethane and hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source.It is suitable
The limited shape of efficiency is removed due to a lack of carbon source for biological treatment process such as sewage nutrient removal and flue gas desulfurization and denitrifications
Condition belongs to water-treatment technology field.
Background technique
Currently, bioanalysis is widely used in pollution control, such as sewage denitrification and dephosphorization and biological flue gas desulfurisation denitrification process.But
It is to usually require supplement additional carbon due to lacking electron donor in carrying out biological treatment process.Especially south China
Area, organic concentration is low in sewage, it is difficult to meet the carbon source demand of denitrogenation dephosphorizing.To solve carbon source deficiency biological denitrificaion efficiency
Low problem must just add additional supplementary carbon source, improve treatment process in such a way that supplementary carbon source increases electron donor
Efficiency.But such processing is in the prevalence of " controlling is poor, with high costs, operational management is complicated, qualified discharge is difficult " etc.
Outstanding problem.The main technical requirements of controllable sustained-release carbon source be can slowly stable release supplementary carbon source while can also be effective
Ground recycles and reuses.Moreover, the traditional carbon source added in most of sewage water denitrification techniques is all with degradable small point
Based on sub- organic matter and carbohydrate, such as: methanol, ethyl alcohol, acetic acid, sodium acetate, glucose, sucrose, controllable sustained-release carbon source it is main
The bioconversion short chain fatty acids that technology is generated using sludge hydrolytic not only effectively realize waste utilization, while increasing carbon
The utilization efficiency in source, this is very great to ecological safety and Sustainable Socioeconomic Development meaning.
Hydrotalcite (layered double hydroxides, LDHs) is a kind of layered double hydroxide.Due to gathering around
There are this special structure and property, is allowed to show extraordinary prospect in terms of Adsorption pollutant.And polyurethane
Foamed material has many advantages, such as that simple process, absorption property are excellent, research without secondary pollution and becoming the field in recent years is hot
Point, therefore present invention selection combines the two, it is intended to preparation can be applied to the adsorbent material of actual wastewater treatment as short chain
The timbering material of fatty acid.
Short chain fatty acids (short chain fatty acids, SCFAs), the fatty acid carbon atom number less than 6 calls
Short chain fatty acids, wherein mainly having acetic acid, propionic acid, isobutyric acid, n-butyric acie, isovaleric acid, positive valeric acid.In sewage denitrification and dephosphorization process
In, denitrifying bacterium and polyP bacteria growth need enough carbon sources, a large amount of studies have shown that city excess sludge is after anaerobic fermentation
The a large amount of short chain fatty acids generated may be used as improving the substitution carbon source of sewage nutrient removal process.Sewage treatment plant is remaining dirty
Mud is the association product in sewage disposal process, is the condensation product of dirty water pollutant, and direct emission can cause environment seriously
Secondary pollution.And sludge fermentation liquid is reinforced into the research of sewage treatment directly as liquid supplementary carbon source it is verified that having
Certain effect, but be a lack of timbering material and select to be added directly in terms of the operability and given a discount greatly in terms of economy
Button.
Therefore, using the short chain fatty acids that sludge fermentation liquid generates as carbon source material, it is controllable slow to seek timbering material preparation
Releasing carbon source is the work with important research value.To have that " memory effect, laminate are adjustable, anion is commutative at present
And high-specific surface area " Ca/Al hydrotalcite adsorbent material and polyurethane material it is compound be used as bracket adsorbing and extracting short-chain fat
There is not been reported both at home and abroad for the sour research as bio-denitrifying sewage dephosphorization process supplementary carbon source.If can be with polyurethane/hydrotalcite
Composite material prepares plus slow release carbon source as timbering material, by carbon source of sludge fermentation liquid Short-Chain Fatty Acids, not only can be with
It realizes utilization of waste as resource, has highly important guidance for further increasing biopotency and engineeringization
Meaning.
Summary of the invention
The object of the invention generates short-chain fat by carrying out fermentation pretreatment to sewage treatment plant excess sludge with thermokalite method
Sour (SCFAs) synthesizes Ca/Al hydrotalcite material using ultrasonic wave added method, using a step foaming by polyurethane and Ca/Al neatly
Stone carries out composite foamed synthesis of polyurethane/hydrotalcite compound support frame material, to the short chain fatty acids (SCFAs) in sludge fermentation liquid
Carry out the preparation that adsorbing and extracting realizes in biological treatment process the novel controllable sustained-release carbon source of " efficiently, economic, feasible ".The present invention
Technical problems to be solved are as follows:
(1) it in order to make the waste in sewage disposal process be fully used, will generated in sewage disposal process
When excess sludge is fermented, needs to control optimal conditions of fermentation to obtain higher degradation efficiency and obtain the short of higher concentration
Chain fatty acid (SCFAs).
(2) it for the ease of realizing controllably effective recycling of carbon source in sewage treatment, needs to polyurethane material and Ca/Al water
Talc materials progress is compound, is allowed to the characteristic for having convenient for recycling control.
(3) polyurethane/hydrotalcite composite material is carried out compound tense is to obtain optimal composite foamed effect, it is thus necessary to determine that
The specific mass fraction of composition of raw materials.
(4) short chain fatty acids in adsorbing and extracting sludge fermentation liquid are carried out using polyurethane material and hydrotalcite composite material
(SCFAs) when, to obtain maximum adsorption efficiency, it is thus necessary to determine that the control parameter that optimal adsorption is extracted.
By the method for polyurethane and hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source, specifically according to following step
Suddenly it carries out:
(1) excess sludge of sewage treatment plant is discarded supernatant liquid after standing 22 ~ 25 h, is placed in 3 ~ 5 through 90 ~ 110 mesh sievings
It is DEG C stored refrigerated spare to get sludge sample；
(2) the sludge sample that MLSS is 8 ~ 10 mg/L is put into reactor, alkali is added under conditions of continuously stirring, adjusts
PH is 10 ~ 12, is then sealed with tinfoil, and being put into constant water bath box and adjusting temperature is that 60 ~ 90 min are heated at 80 ~ 100 DEG C
3 ~ 5 d of anaerobic fermentation in 25 ~ 35 DEG C of constant temperature oscillator afterwards；
(3) certain mass CaO powder is added in the conical flask containing distilled water and forms emulsion, and this emulsion is ultrasonic
It is Ca (OH) that 20 ~ 30 min of dispersion, which obtain main component, 2Emulsion it is stand-by, the molal weight ratio according to Ca, Al is to weigh at 3: 1
The AlCl of corrresponding quality3Wiring solution-forming is stand-by, to Ca (OH) 2Emulsion conical flask in add stand-by AlCl3Solution carries out
2.5 ~ 3.5 h of ultrasonic reaction, will reaction gained liquid stand 40 ~ 60 min after by washing of precipitate filtration drying up to Ca/Al water
Talc materials；
(4) by polyether polyol, the NaHCO of the Ca/Al hydrotalcite material of preparation and certain mass3(foaming agent), dimethyl-silicon
Oily (foam stabiliser) and dibutyl tin dilaurate (catalyst) are placed in plastic cup, are mixed well, then by a certain amount of first
Phenylene diisocyanate (TDI) is added in the mixture, and the mass fraction of above-mentioned each material composition proportion is as shown in the table:
20 ~ 30 s are stirred after mixing rapidly, carry out free foaming, product is moved into 2 ~ 3 h of curing in 100 DEG C of drying boxes, is taken out
Stripping and slicing is packed into floating stuffing ball to get polyurethane/hydrotalcite compound support frame material afterwards.
(5) polyurethane/hydrotalcite compound support frame material the adding than being placed according to 20 ~ 50 g/L for preparing step (4)
It is 20 ~ 40 DEG C in temperature, revolving speed is in the constant temperature oscillation case of 70 ~ 120 rpm/min in the mixed liquor fermented in step (2)
Floating stuffing ball taken out to 60 ~ 90 min of short chain fatty acids adsorbing and extracting in fermentation liquid, after absorption sufficiently complete polyurethane/
The recycling of hydrotalcite compound support frame material both obtains the novel controllable sustained-release additional carbon.
Beneficial achievement of the invention is: the present invention carries out fermentation pretreatment to excess sludge using thermokalite method, can be effectively real
Existing sludge broken wall is improved the sour efficiency of subsequent production, efficiently completes the preparation of short chain fatty acids (SCFAs), closed using ultrasonic wave added method
At Ca/Al hydrotalcite material, keep operating process more simple and easy to do, using a step foaming by polyurethane and Ca/Al hydrotalcite
It carries out compound, solves the problems, such as that powder body material is not easily recycled after, the technique for reducing subsequent processing is reduced into
This.Polyurethane/hydrotalcite compound support frame material is placed in sludge fermentation liquid, is allowed to the short chain fatty acids in fermentation liquid
(SCFAs) up to the controllable sustained-release carbon source after progress adsorbing and extracting.It is long that this method has not only changed sewage treatment plant excess sludge
It has been considered as the traditional understanding of waste since phase, meanwhile, polyurethane/hydrotalcite composite foam material is using polyurethane foam as base
Body, using prepared timbering material as a kind of advanced composite material (ACM) of filler, it had both had polyurethane foam hole more, specific surface
Product is big, and relative density is small, the high feature of specific strength, and is that one kind has fine life with the good adsorbent performance of timbering material
The environment-friendly materials of object compatibility, have broad application prospects.Currently, dirty with polyurethane/hydrotalcite composite material adsorbing and extracting
Mud fermentation liquid Short-Chain Fatty Acids prepare this thinking of the method for controllable sustained-release carbon source, there is no precedent both at home and abroad.
Detailed description of the invention
Fig. 1 is the preparation step schematic diagram of controllable sustained-release carbon source.
Fig. 2 is controllable sustained-release carbon source Technology Roadmap used in sewage treatment process.
Fig. 3 is the product photo of polyurethane/hydrotalcite composite material slow release carbon source.
Fig. 4 is prepared Ca/Al hydrotalcite material XRD characterization figure.
Fig. 5 is prepared Ca/Al hydrotalcite material SEM phenogram.
Fig. 6 is prepared Ca/Al hydrotalcite material TEM phenogram.
Fig. 7 is prepared polyurethane/hydrotalcite composite material SEM phenogram.
Fig. 8 is SEM phenogram of the polyurethane/hydrotalcite composite material after adsorbing and extracting short chain fatty acids.
Fig. 9 is composite material and simple hydrotalcite material to fermentation liquid Short-Chain Fatty Acids extraction effect accumulation graph.
Specific embodiment
For a better understanding of the invention, the invention will be further described with example with reference to the accompanying drawing, but the present invention wants
The range of protection is asked to be not limited to the range that example is illustrated.
Specific embodiment 1: polyurethane and the preparation of hydrotalcite compound collecting short chain fatty acids are sustained carbon by present embodiment
The method in source, specifically follows the steps below:
(1) excess sludge of sewage treatment plant is discarded supernatant liquid after standing 24 h, is placed in 5 DEG C of refrigerations through 100 mesh sievings
It saves backup to get sludge sample；
(2) the sludge sample that MLSS is 8 ~ 10 mg/L is put into reactor, alkali is added under conditions of continuously stirring, adjusts
PH is 10 ~ 12, is then sealed with tinfoil, and being put into constant water bath box and adjusting temperature is that 60 ~ 90 min are heated at 80 ~ 100 DEG C
3 ~ 5 d of anaerobic fermentation in 25 ~ 35 DEG C of constant temperature oscillator afterwards；
(3) certain mass CaO powder is added in the conical flask containing distilled water and forms emulsion, and this emulsion is ultrasonic
It is Ca (OH) that 20 ~ 30 min of dispersion, which obtain main component, 2Emulsion it is stand-by, the molal weight ratio according to Ca, Al is to weigh at 3: 1
The AlCl of corrresponding quality3Wiring solution-forming is stand-by, to Ca (OH) 2Emulsion conical flask in add stand-by AlCl3Solution carries out
2.5 ~ 3.5 h of ultrasonic reaction, will reaction gained liquid stand 40 ~ 60 min after by washing of precipitate filtration drying up to Ca/Al water
Talc materials；
(4) by polyether polyol, the NaHCO of the Ca/Al hydrotalcite material of preparation and certain mass3(foaming agent), dimethyl-silicon
Oily (foam stabiliser) and dibutyl tin dilaurate (catalyst) are placed in plastic cup, are mixed well, then by a certain amount of first
Phenylene diisocyanate (TDI) is added in the mixture, and the mass fraction of above-mentioned each material composition proportion is as shown in the table:
20 ~ 30 s are stirred after mixing rapidly, carry out free foaming, product is moved into 2 ~ 3 h of curing in 100 DEG C of drying boxes, is taken out
Stripping and slicing is packed into floating stuffing ball to get polyurethane/hydrotalcite compound support frame material afterwards.
(5) polyurethane/hydrotalcite compound support frame material the adding than being placed according to 20 ~ 50 g/L for preparing step (4)
It is 20 ~ 40 DEG C in temperature, revolving speed is in the constant temperature oscillation case of 70 ~ 120 rpm/min in the mixed liquor fermented in step (2)
Floating stuffing ball taken out to 60 ~ 90 min of short chain fatty acids adsorbing and extracting in fermentation liquid, after absorption sufficiently complete polyurethane/
The recycling of hydrotalcite compound support frame material both obtains the novel controllable sustained-release additional carbon.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: in (4) one step foaming of step
Ca/Al hydrotalcite material quality number is 30.It is other same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first embodiment in that: in (4) one step foaming of step
Ca/Al hydrotalcite material quality number is 40.It is other same as the specific embodiment one.
Beneficial effects of the present invention are verified using following embodiment and comparative experiments:
Embodiment:
The present embodiment by polyurethane and hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source method be specifically according to
What lower step carried out:
(1) excess sludge of sewage treatment plant is discarded supernatant liquid after standing 24 h, is placed in 5 DEG C of refrigerations through 100 mesh sievings
It saves backup to get sludge sample；
(2) sludge sample is put into reactor, the NaOH of 4 mol/L is added under conditions of continuously stirring, adjust pH to 12,
Then it is sealed with tinfoil, is put into constant water bath box anaerobism in 35 DEG C of constant temperature oscillator after 90 DEG C of 90 min of heating
Ferment 5 d；
(3) 1.12 g CaO powders are added in the conical flask containing 100 mL distilled water, and this emulsion is surpassed
Sound disperses 30 min to obtain main component to be Ca (OH) 2Emulsion it is stand-by, weighed according to the molal weight ratio of Ca, Al for 3:1
The AlCl of 0.89 g350 mL solution for later use are made into, to Ca (OH) 2Emulsion conical flask in add stand-by AlCl3Solution surpasses
3 h of phonoresponse, will reaction gained liquid stand 50 min after by washing of precipitate filtration drying up to Ca/Al hydrotalcite material；
(4) by polyether polyol, the NaHCO of the Ca/Al hydrotalcite timbering material of preparation and certain mass3(foaming agent), diformazan
Base silicone oil (foam stabiliser) and dibutyl tin dilaurate (catalyst) are placed in plastic cup, are mixed well, then will be a certain amount of
Toluene di-isocyanate(TDI) (TDI) be added in the mixture, the mass fraction of above-mentioned each material composition proportion is as shown in the table:
25 s are stirred after mixing rapidly, free foaming is carried out, product is moved in 100 DEG C of drying boxes and cures 2 h, is cut after taking-up
It is packaged enter floating stuffing ball to get polyurethane/hydrotalcite compound support frame material.
(5) by the polyurethane/hydrotalcite compound support frame material of step (4) preparation according to 35 g/L(Ca/Al water contained therein
Talcum is about 15 g/L) add than being placed in the mixed liquor fermented in step (2), be 30 DEG C in temperature, revolving speed 100
To 90 min of short chain fatty acids adsorbing and extracting in fermentation liquid in the constant temperature oscillation case of rpm/min, suspension is filled out after absorption sufficiently
Pellet takes out the recycling for completing polyurethane/hydrotalcite compound support frame material, both obtains the novel controllable sustained-release additional carbon.Period adopts
Fermentation liquid Short-Chain Fatty Acids changes of contents is measured with gas chromatography.
Wherein excess sludge used is taken from Shanxi Zhenyang sewage purification Co., Ltd secondary settling tank.
Comparative experiments:
The Ca/Al hydrotalcite powder of ultrasonic wave added method synthesis is directlyed adopt without short in compound direct adsorbing and extracting sludge fermentation liquid
Chain fatty acid compares to prepare additional carbon, is specifically realized by the following steps:
(1) excess sludge of sewage treatment plant is discarded supernatant liquid after standing 24 h, is placed in 5 DEG C of refrigerations through 100 mesh sievings
It saves backup to get sludge sample；
(2) sludge sample is put into reactor, the NaOH of 4 mol/L is added under conditions of continuously stirring, adjust pH to 12,
Then it is sealed with tinfoil, is put into constant water bath box anaerobism in 35 DEG C of constant temperature oscillator after 90 DEG C of 90 min of heating
Ferment 5 d；
(3) 1.12 g CaO powders are added in the conical flask containing 100 mL distilled water, and this emulsion is surpassed
Sound disperses 30 min to obtain main component to be Ca (OH) 2Emulsion it is stand-by, weighed according to the molal weight ratio of Ca, Al for 3:1
The AlCl of 0.89 g3Powder is made into 50 mL solution for later use, to Ca (OH) 2Emulsion conical flask in add stand-by AlCl3It is molten
Liquid, 3 h of ultrasonic reaction, will reaction gained liquid stand 50 min after by washing of precipitate filtration drying up to Ca/Al neatly stone material
Material；
(5) the Ca/Al hydrotalcite material of step (3) preparation is fermented in step (2) according to adding for 15 g/L than being placed in
It is 30 DEG C in temperature, revolving speed is in the constant temperature oscillation case of 100 rpm/min to the short chain fatty acids in fermentation liquid in mixed liquor
Mixed liquor centrifugation is extracted the Ca/Al hydrotalcite material after adsorbing as additional after absorption sufficiently by 90 min of adsorbing and extracting
During which carbon source measures fermentation liquid Short-Chain Fatty Acids changes of contents using gas chromatography.
Wherein excess sludge used is taken from Shanxi Zhenyang sewage purification Co., Ltd secondary settling tank.
Explanation about attached drawing
Fig. 1 is the preparation step schematic diagram of controllable sustained-release carbon source.The maximum feature of this method be exactly by hydrotalcite and polyurethane into
Row is composite foamed, is dispersed in hydrotalcite adsorbent material in polyurethane foam system, to take into account hydrotalcite and poly- ammonia
The dual characteristics of ester obtain efficient, economic, feasible novel supplementary carbon source after adsorbing and extracting short chain fatty acids.
Fig. 2 is controllable sustained-release carbon source Technology Roadmap used in sewage treatment process.It can be with from Technology Roadmap
The purpose by polyurethane and hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source method of seeing of image is preparation one
Kind, which makes full use of, to be generated waste and is convenient for saving, transporting, adding, controlling, recycling novel controllable slow in sewage disposal process
Carbon source is released, to more effectively alleviate the relatively low status of municipal sewage C/N.
Fig. 3 is that the method for preparing slow release carbon source using polyurethane and hydrotalcite compound collecting short chain fatty acids is prepared into sustained release
The product photo of carbon source.The feature of this method maximum is that traditional disposable additional carbon of liquid, which is improved to solid, to be weighed
Carbon source is utilized again, and is got application in practice to easily facilitate, this method combination filling ball, by polyurethane/hydrotalcite
Composite foam is integrated well with filler cage, consequently facilitating adding and recycling.
Fig. 4 is prepared Ca/Al hydrotalcite material XRD characterization figure.It can be seen from the figure that 2theta be 11.5 °,
23.0 °, 32.0 ° nearby there is the common corresponding characteristic diffraction peak of Ca/Al hydrotalcite, show hydrotalcite prepared by the present invention
With typical microcosmic composition and structure, while its diffraction maximum peak type is symmetrically sharp, illustrates that the product has preferable crystallinity.
Fig. 5 is prepared Ca/Al hydrotalcite material SEM phenogram.It can be seen from the figure that synthesized by the condition
Hydrotalcite has irregular lamellar pattern, and this pattern is similar to the pattern of hydrotalcite in numerous studies, and sheet size is about
It is 1 ~ 4 μm.The position of black circles meaning clearer can find out the lamellar pattern in figure.
Fig. 6 is prepared Ca/Al hydrotalcite material TEM phenogram.The figure further shows hydrotalcite material spy
Some layer structures show it very in terms of Adsorption pollutant due to possessing this special structure and property
Good application prospect.
Fig. 7 is prepared polyurethane/hydrotalcite composite material SEM phenogram.As we can see from the figure in polyurethane foam
Foam material surface it is evenly dispersed hydrotalcite material, while can see the inherently loose porous knot of polyurethane foam material
Structure possesses biggish specific surface area, has certain absorption property.
Fig. 8 is SEM phenogram of the polyurethane/hydrotalcite composite material after adsorbing and extracting short chain fatty acids.It can from figure
It is wrapped by small molecule fatty acid with being clearly apparent material among structure and surface after adsorbing and extracting short chain fatty acids, illustrates this
Timbering material has carried out effective absorption to small molecule fatty acid really, while material is thrown to sewage treatment anoxic section to be subsequent
The release that can carry out short chain fatty acids is proved.
Fig. 9 is composite material and simple hydrotalcite material to fermentation liquid Short-Chain Fatty Acids extraction effect accumulation graph.From figure
In as can be seen that the different situations measured using gas chromatography the accumulation of excess sludge fermentation broth Short-Chain Fatty Acids content
Figure is significantly increased by short-chain fat acid concentration after fermentation, and is directly inhaled using hydrotalcite powder to it without foaming
Attached, adsorption efficiency maximum can only achieve 60%, and by being improved closely after compound to the adsorption efficiency of short chain fatty acids with polyurethane
20%, this, which has been turned out, can not only mention polyurethane and the method for hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source
High adsorption efficiency, while feasibility is provided for the rapid recycling Reusability of prepared product.
In conclusion this method can solve existing for current conventional liquid carbon source vulnerable to water inlet influence of fluctuations, dosage
Uncontrollable problem, by using polyurethane hydrotalcite composite material as timbering material, with the short-chain fat in sludge fermentation liquid
Acid is the new process of the controllable easily recycling slow release carbon source of carbon source preparation, be may make in sewage nutrient removal, flue gas desulfurization and denitrification etc.
More efficient in terms of biological treatment efficiency, economical, feasible, this is very heavy to ecological safety and Sustainable Socioeconomic Development meaning
Greatly.
Claims (2)
1. a kind of method by polyurethane and hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source, it is characterised in that the party
Method sequentially includes the following steps:
(1) excess sludge of sewage treatment plant is discarded supernatant liquid after standing 22 ~ 25 h, is placed in 3 ~ 5 through 90 ~ 110 mesh sievings
It is DEG C stored refrigerated spare to get sludge sample；
(2) the sludge sample that MLSS is 8 ~ 10 mg/L is put into reactor, alkali is added under conditions of continuously stirring, adjusts
PH is 10 ~ 12, is then sealed with tinfoil, and being put into constant water bath box and adjusting temperature is that 60 ~ 90 min are heated at 80 ~ 100 DEG C
3 ~ 5 d of anaerobic fermentation in 25 ~ 35 DEG C of constant temperature oscillator afterwards；
(3) certain mass CaO powder is added in the conical flask containing distilled water and forms emulsion, and this emulsion is ultrasonic
It is Ca (OH) that 20 ~ 30 min of dispersion, which obtain main component, 2Emulsion it is stand-by, the molal weight ratio according to Ca, Al is to weigh at 3: 1
The AlCl of corrresponding quality3Wiring solution-forming is stand-by, to Ca (OH) 2Emulsion conical flask in add stand-by AlCl3Solution carries out
2.5 ~ 3.5 h of ultrasonic reaction, will reaction gained liquid stand 40 ~ 60 min after by washing of precipitate filtration drying up to Ca/Al water
Talc materials；
(4) by polyether polyol, the NaHCO of the Ca/Al hydrotalcite material of preparation and certain mass3, dimethicone and two laurels
Sour dibutyl tin is placed in plastic cup, is mixed well, then a certain amount of toluene di-isocyanate(TDI) is added in the mixture, above-mentioned
The mass fraction of each material composition proportion is as follows: 100 parts of polyether polyol, 1.8 parts of water, and 1 part of dimethicone, tin dilaurate two
1 part of butyl tin, NaHCO31 part, 50 parts of toluene di-isocyanate(TDI), 20 ~ 40 parts of Ca/Al hydrotalcite；20 ~ 30 are stirred after mixing rapidly
S carries out free foaming, product is moved to 2 ~ 3 h of curing in 100 DEG C of drying boxes, stripping and slicing is packed into floating stuffing ball after taking-up, i.e.,
Obtain polyurethane/hydrotalcite compound support frame material；
(5) polyurethane/hydrotalcite compound support frame material the adding than being placed in step according to 20 ~ 50 g/L for preparing step (4)
It (2) is 20 ~ 40 DEG C in temperature, revolving speed is in the constant temperature oscillation case of 70 ~ 120 rpm/min to hair in the mixed liquor fermented in
Floating stuffing ball is taken out after absorption sufficiently and completes polyurethane/neatly by 60 ~ 90 min of short chain fatty acids adsorbing and extracting in zymotic fluid
The recycling of stone compound support frame material both obtains the novel controllable sustained-release additional carbon.
2. a kind of side by polyurethane and hydrotalcite compound collecting short chain fatty acids preparation slow release carbon source as described in claim 1
Method, which is characterized in that the dosage of Ca/Al hydrotalcite is 20 parts or 30 parts or 40 parts in step (4).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057250A (en) * | 2021-11-16 | 2022-02-18 | 湖南师范大学 | Method for preparing solid carbon source by using kitchen waste filtrate and performance evaluation method thereof |
| CN114455776A (en) * | 2021-12-21 | 2022-05-10 | 中煤科工集团杭州研究院有限公司 | Stainless steel pickling wastewater treatment method based on biological denitrification |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102336465A (en) * | 2011-09-02 | 2012-02-01 | 重庆大学 | Filling material for sewage treatment and preparation method thereof |
| CN104937149A (en) * | 2013-01-18 | 2015-09-23 | 东丽奥培隆特士株式会社 | Polyurethane fiber |
| CN106902767A (en) * | 2017-02-27 | 2017-06-30 | 江苏大学 | Hollow MnO2@SiO2The preparation method and application of nano material modified polyurethane foam |
| CN107746166A (en) * | 2017-10-30 | 2018-03-02 | 太原理工大学 | A kind of method that magnetic slow release carbon source is prepared using municipal sludge and eggshell as raw material |
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| CN102336465A (en) * | 2011-09-02 | 2012-02-01 | 重庆大学 | Filling material for sewage treatment and preparation method thereof |
| CN104937149A (en) * | 2013-01-18 | 2015-09-23 | 东丽奥培隆特士株式会社 | Polyurethane fiber |
| CN106902767A (en) * | 2017-02-27 | 2017-06-30 | 江苏大学 | Hollow MnO2@SiO2The preparation method and application of nano material modified polyurethane foam |
| CN107746166A (en) * | 2017-10-30 | 2018-03-02 | 太原理工大学 | A kind of method that magnetic slow release carbon source is prepared using municipal sludge and eggshell as raw material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114057250A (en) * | 2021-11-16 | 2022-02-18 | 湖南师范大学 | Method for preparing solid carbon source by using kitchen waste filtrate and performance evaluation method thereof |
| CN114455776A (en) * | 2021-12-21 | 2022-05-10 | 中煤科工集团杭州研究院有限公司 | Stainless steel pickling wastewater treatment method based on biological denitrification |
| CN114455776B (en) * | 2021-12-21 | 2022-12-06 | 中煤科工集团杭州研究院有限公司 | Stainless steel pickling wastewater treatment method based on biological denitrification |
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