CN215828783U - System for acid production is answered to kitchen garbage basicity - Google Patents
System for acid production is answered to kitchen garbage basicity Download PDFInfo
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Abstract
The utility model discloses a kitchen waste alkaline acid production system, which comprises an anaerobic acid production system and an alkaline addition system, wherein kitchen waste enters from a water inlet end of the anaerobic acid production system, and fermentation liquor containing organic acid/organic acid salt generated by the anaerobic acid production system is discharged from a water outlet of the anaerobic acid production system; the anaerobic acid production system comprises an anaerobic fermentation tank alkaline substance, and the top of the anaerobic fermentation tank alkaline substance is provided with a gas-liquid separator alkaline substance; the alkali adding system comprises an alkali tank, wherein an alkaline substance for adjusting the pH value of the water body is stored in the alkali tank; the alkali tank is connected with the anaerobic fermentation tank. The utility model adopts alkaline fermentation to produce acid, thus improving the yield of organic acid in the subsequent process of the kitchen garbage; calcium phosphate precipitation is adopted, so that the removal efficiency of phosphorus is effectively improved; in addition, the product of anaerobic alkaline acidogenesis is H2And CO2Gaseous product of which H2Can be used as clean energy for recycling, and is an environment-friendly kitchen waste treatment mode.
Description
Technical Field
The utility model belongs to the technical field of organic waste disposal of kitchen waste treatment, and particularly relates to a kitchen waste alkaline acid production system.
Background
Kitchen waste, also known as kitchen waste, refers to waste generated in activities such as daily life, food processing, food service, unit meal supply and the like of residents, and comprises discarded vegetable leaves, leftovers, fruit peels, egg shells, tea leaves, bones and the like, and the main sources of the kitchen waste are household kitchens, restaurants, mess halls, markets and other industries related to food processing.
The kitchen waste contains extremely high moisture and organic matters, is easy to rot and generates stink. Illegal collection and recycling of kitchen waste can pose a threat to the environment and the health of residents. The kitchen garbage is separately collected, the amount of organic matters entering a landfill can be reduced, the generation of odor and garbage leachate is reduced, the adverse effect of excessive moisture on garbage incineration treatment can be avoided, and the corrosion to equipment is reduced. The kitchen garbage can be converted into new resources through proper treatment and processing, the characteristic of high organic matter content enables the kitchen garbage to be used as fertilizer and feed after strict treatment, methane can be generated to be used as fuel or power generation, and the grease part can be used for preparing biofuel.
At present, the main technology for treating the kitchen waste is that the kitchen waste is firstly sorted, is ground and then is subjected to wet heat treatment, and is centrifuged to carry out three-phase separation of waste oil, slurry and solid residues; esterifying the separated waste oil to prepare biodiesel; the slurry is firstly subjected to anaerobic fermentation to produce methane, then aerobic treatment is carried out, and finally the slurry is discharged after reaching the standard; composting or insect absorption is carried out on the kitchen solid residues. Among them, anaerobic fermentation is the most important and complex process in the whole treatment process.
Traditional anaerobic fermentation usually adopts an acid fermentation method. The main problems of the prior art include long process flow, low added value of biogas, difficult standard discharge of slurry and the like, in particular to the problems of high ammonia nitrogen concentration in wastewater, difficult treatment, difficult product sale after solid slag composting and the like. The problems need to be solved effectively, so that effective treatment of kitchen garbage is realized better, and environment-friendly resource recycling is realized.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the defects in the prior art, the utility model provides a kitchen waste alkaline acid production system, which adopts the addition of alkaline substances to improve the pH value of a fermentation system, prolong the fermentation acid production time, effectively remove phosphorus and ammonia nitrogen in kitchen waste wastewater and obtain fermentation liquor rich in organic acid/organic acid salt.
The technical scheme is as follows: in order to achieve the purpose, the anaerobic alkaline acid production technology of the kitchen waste adopted by the utility model is mainly summarized as follows:
organic matters in the kitchen garbage are converted into organic acid through the metabolism of anaerobic acid-producing microorganisms, and the pH value (pH) of the system is reduced in the acid-producing process, so that acidification inhibition is generatedThis is not conducive to continuous production of acid. The technique adopts the addition of alkaline substances, such as Ca (OH)2The pH value of the fermentation system is increased, the reaction process is favorably and smoothly carried out, and the acid production time of the fermentation is prolonged. Meanwhile, phosphoric acid is generated in the anaerobic acid production process of kitchen wastes, and the phosphoric acid and calcium ions form precipitates, so that phosphorus in the wastewater is removed.
The utility model aims to provide an alkaline acid production system for alkaline acid production of kitchen waste, which comprises an anaerobic acid production system and an alkali addition system, wherein the alkali addition system is connected with the anaerobic acid production system; kitchen waste enters from the water inlet end of the anaerobic acid-producing system, and fermentation liquor containing organic acid/organic acid salt generated by the anaerobic acid-producing system is discharged from the water outlet of the anaerobic acid-producing system;
the anaerobic acid production system comprises an anaerobic fermentation tank alkaline substance, and the top of the anaerobic fermentation tank alkaline substance is provided with a gas-liquid separator alkaline substance;
the alkali adding system comprises an alkali tank, wherein an alkaline substance for adjusting the pH value of the water body is stored in the alkali tank;
the alkali tank is connected with the anaerobic fermentation tank.
Optionally, the alkali adding system further comprises a pH probe alkaline substance, a PLC control system alkaline substance, and an alkali adding pump alkaline substance, wherein the pH probe alkaline substance is located in the anaerobic fermentation tank alkaline substance, the pH probe alkaline substance is in signal connection with the PLC control system alkaline substance, the PLC control system alkaline substance is in control connection with the alkali adding pump alkaline substance, and the alkali adding pump alkaline substance is in pipeline connection with the alkali tank alkaline substance;
when the detection signal of the pH probe alkaline substance reaches a set value, the PLC control system alkaline substance controls the alkaline substance of the alkali adding pump to be started, and the alkaline substance in the alkaline substance of the alkaline tank is conveyed to the alkaline substance in the alkaline substance of the anaerobic fermentation tank.
Optionally, the set value is pH 8-10.
Optionally, the anaerobic acid production system is a membrane anaerobic system, the membrane anaerobic system includes anaerobic fermentation tank alkaline substances, water outlet device alkaline substances, middle buffer tank alkaline substances and external tubular membrane assembly alkaline substances, the anaerobic fermentation tank alkaline substances, the water outlet device alkaline substances, the middle buffer tank alkaline substances and the water inlet end and the water outlet end of the external tubular membrane assembly alkaline substances are sequentially connected by a pipeline, and fermentation liquor containing the organic acid/organic acid salt generated by the anaerobic acid production system is discharged from the water outlet end of the external tubular membrane assembly alkaline substances; the external tubular membrane component alkaline substance is formed by connecting a plurality of membrane tubes through an elbow alkaline substance.
Optionally, the anaerobic acid production system further comprises a drum screening machine alkaline substance and a sludge filter alkaline substance;
the water inlet end and the water outlet end of the water outlet device alkaline substance, the drum screening machine alkaline substance, the intermediate buffer tank alkaline substance, the sludge filter alkaline substance and the tubular membrane component alkaline substance are sequentially connected through pipelines.
Optionally, the concentrated solution outlet end of the alkaline substance of the external tubular membrane module is connected to the backflow water inlet end of the alkaline substance of the intermediate buffer tank, the backflow water outlet end of the alkaline substance of the intermediate buffer tank is connected to the backflow water inlet end of the alkaline substance of the anaerobic fermentation tank, and the alkaline substance of the external tubular membrane module, the alkaline substance of the intermediate buffer tank and the alkaline substance of the anaerobic fermentation tank form a concentrated solution backflow circulation system.
Optionally, the inlet end of the alkaline substance of the external tubular membrane module is connected with a circulating pump alkaline substance, and the cross flow rate of the inlet end of the alkaline substance of the external tubular membrane module is controlled to be 4-6 m/s.
The kitchen waste is pretreated and then enters an anaerobic acid production system to carry out anaerobic acid production reaction, an alkaline substance is added into the anaerobic acid production system through an alkaline addition system, the pH is regulated to be more than or equal to 8.0, and metal ions in the alkaline substance react with phosphorus to precipitate so as to obtain dephosphorized fermentation liquor containing organic acid/organic acid salt.
Optionally, the alkaline substance is NaOH and Ca (OH)2Which isIn (1), Ca (OH)2The dosage of the compound is enough to form calcium phosphate sediment with phosphate radical, and the rest is NaOH.
Optionally, the kitchen waste comprises kitchen waste organic solid residues and/or kitchen waste water after centrifugal filtration, wherein the protein content of the kitchen waste organic solid residues is 10% -30%; the COD of the kitchen waste water is 90000-120000mg/L, the total nitrogen is 1000-3000mg/L, and the total phosphorus is 100-300 mg/L.
Optionally, when the kitchen waste is a mixture of kitchen waste organic solid residues and kitchen waste water, the weight ratio of the kitchen waste organic solid residues to the kitchen waste water is (5-10): (70-90); when the kitchen waste is organic solid kitchen waste, the organic solid kitchen waste is diluted by adding water, and the mass concentration of the organic solid kitchen waste is 10%.
Optionally, the anaerobic acidogenic reaction comprises the following steps:
1.1) filtering the kitchen garbage, then feeding the filtered kitchen garbage into an anaerobic fermentation tank (3), adding alkaline substances to control the pH to be more than or equal to 8.0, carrying out anaerobic acid production reaction at the temperature of 30-57 ℃, and decomposing the kitchen garbage into hydrogen and CO2And an initial fermentation broth;
1.2) collecting the hydrogen and CO through a gas-liquid separator (4)2；
1.3) discharging the initial fermentation liquor from the water outlet end of the anaerobic fermentation tank (3), filtering to obtain fermentation liquor after anaerobic acid production, and discharging for later use.
Optionally, the acid production amount of the anaerobic acid production process is more than 30 g/L.
Optionally, the product of the anaerobic acidogenic reaction further comprises a gaseous product H2And CO2，H2The mass concentration of the carbon dioxide is 40-70%, and the balance is CO2。
Another object of the present invention is to provide a fermentation broth rich in organic acids/organic acid salts prepared from kitchen waste.
Has the advantages that: compared with the prior art, the kitchen waste alkaline fermentation acid production system has the following advantages,
(1) the process flow is shorter, and the cost is saved compared with the traditional kitchen waste treatment;
(2) the alkaline fermentation is adopted to produce acid, so that the yield of organic acid prepared from kitchen garbage is increased;
(3) the product of anaerobic alkaline acidogenesis is H2And CO2Gaseous product of which H2Can be recycled as clean energy, and is an environment-friendly kitchen waste treatment mode;
(4) the calcium phosphate precipitation is adopted, the effect is better than that of the traditional struvite precipitation of phosphorus and ammonia nitrogen, and the problems of difficult struvite precipitation and the like caused by the inconsistent proportion of phosphorus and ammonia nitrogen in fermentation liquor are solved.
Drawings
FIG. 1 is a schematic diagram of a membrane anaerobic system;
FIG. 2 is a flow chart of the process for preparing organic acid/organic acid salt from kitchen waste.
Reference numerals: the system comprises a water inlet pump 1, a raw water filter 2, an anaerobic fermentation tank 3, a pH probe 301, an alkali tank 302, a PLC control system 303, an alkali adding pump 304, a gas-liquid separator 4, a water outlet device 5, an intermediate cache tank 6, an intermediate cache tank reflux pump 7, a sludge inlet pump 8, a sludge filter 9, a circulating pump 10, a membrane assembly 11, a drum screening machine 12, a drum screening machine water producing port 13, a drum screening machine slag producing port 14, an extruding machine 15, an elbow 16, a first pipeline Q1, a second pipeline Q2, a third pipeline Q3, a fourth pipeline Q4, a fifth pipeline Q5, a sixth pipeline Q6, a seventh pipeline Q7, an eighth pipeline Q8, a ninth pipeline Q9, a tenth pipeline Q10, an eleventh pipeline Q11 and a twelfth pipeline Q12.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the kitchen waste anaerobic alkaline acidogenic system comprises an anaerobic acidogenic system and an alkaline addition system, wherein kitchen waste enters from the water inlet end of the anaerobic acidogenic system, and fermentation liquor containing organic acid/organic acid salt generated by the anaerobic acidogenic system is discharged from the water outlet of the anaerobic acidogenic system.
As shown in fig. 1, the anaerobic acidogenic system comprises an anaerobic fermentation tank 3, wherein the top of the anaerobic fermentation tank 3 is provided with a gas-liquid separator 4; the alkali adding system comprises an alkali tank 302, wherein an alkaline substance for adjusting the pH value of the water body is stored in the alkali tank 302; the alkali tank 302 is connected with the anaerobic fermentation tank 3.
As an optional embodiment, the alkali adding system further comprises a pH probe 301, a PLC control system 303 and an alkali adding pump 304, wherein the pH probe 301 is located in the anaerobic fermentation tank 3, the pH probe 301 is in signal connection with the PLC control system 303, the PLC control system 303 is in control connection with the alkali adding pump 304, and the alkali adding pump 304 is in pipeline connection with the alkali tank 302;
when the detection signal of the pH probe 301 reaches a set value, the PLC control system 303 controls the alkali adding pump 304 to be turned on, and conveys the alkaline substance in the alkali tank 302 to the alkaline substance in the anaerobic fermentation tank 3.
As an alternative, the set value is pH 8-10.
FIG. 2 shows a process flow diagram of anaerobic alkaline acidogenesis of kitchen waste according to the present invention.
The utility model relates to kitchen waste, which is a treatment object and comprises filtered kitchen waste organic solid residues and/or kitchen waste water, wherein the protein content of the kitchen waste organic solid residues (dry matters) is 10-30%; the COD of the kitchen waste water is 90000-120000mg/L, the total nitrogen is 1000-3000mg/L, and the total phosphorus is 100-300 mg/L. Wherein when the kitchen waste is a mixture of kitchen waste organic solid residues and kitchen waste water, the weight ratio of the kitchen waste organic solid residues to the kitchen waste water is (5-10): (70-90); when the kitchen waste is organic solid kitchen waste, the organic solid kitchen waste is diluted by adding water, and the mass concentration of the organic solid kitchen waste is 10%.
Optionally, the anaerobic acid production process of the present invention may be performed in a membrane anaerobic system, as shown in fig. 1, a water inlet pump 1, a raw water filter 2, an anaerobic fermentation tank 3, a gas-liquid separator 4, a water outlet device 5, a drum sieving machine 12, an intermediate buffer tank 6, a sludge inlet pump 8, a sludge filter 9, a circulation pump 10, and a water inlet end and a water outlet end of an external tubular membrane module 11 of the membrane anaerobic system are sequentially connected by a pipeline, and a fermentation liquid containing the organic acid/organic acid salt generated by the anaerobic acid production system is discharged from the water outlet end of the external tubular membrane module 11;
optionally, the membrane pipes of the external tubular membrane module 11 are connected together by an elbow 16, so as to conveniently draw out fibers deposited at the membrane sludge inlet end by hand, and a hand hole is formed in the elbow 16.
Optionally, the concentrated solution outlet end of the external tubular membrane module 11 is connected to the backflow water inlet end of the intermediate buffer tank 6, the backflow water outlet end of the intermediate buffer tank 6 is connected to the backflow water inlet end of the anaerobic fermentation tank 3 through the intermediate buffer tank reflux pump 7, and the external tubular membrane module 11, the intermediate buffer tank 6 and the anaerobic fermentation tank 3 form a concentrated solution backflow circulation system.
Wherein, drum screen extension 12 is equipped with drum screen extension and produces mouth of a river 13 and drum screen extension and produce slag hole 14, and drum screen extension produces the mouth of a river 13 and is connected to middle buffer tank 6, and drum screen extension produces slag hole 14 and is connected to extruder 15.
The anaerobic fermentation process of the membrane type anaerobic system is as follows:
1) high-concentration kitchen waste wastewater enters a first pipeline Q1, impurities are removed through a water inlet pump 1 and a raw water filter 2, the wastewater is lifted to an anaerobic fermentation tank 3, the temperature in the anaerobic fermentation tank 3 is maintained at 35-40 ℃ or 50-55 ℃, and alkaline substances are added through an alkaline addition system to control the pH value to be more than 8.0; the alkali addition system is used for adding Ca (OH)2NaOH, the alkali adding system comprises a pH probe 301, an alkali tank 302, a PLC control system 303, an alkali adding pump 304, Ca (OH)2Mixing with NaOH and storing in the alkali tank 302; wherein, a pH probe 301 in the anaerobic fermentation tank 3 monitors the pH in the anaerobic fermentation tank 3 in real time, when the pH is lower than a set value, a PLC control system 303 controls an alkali adding pump 304 to automatically add alkali from an alkali tank 302 to the anaerobic fermentation tank 3 through a thirteenth pipeline Q13Setting the pH value to be 8-9, and maintaining the pH value in the tank to be about 9; the kitchen waste is firstly hydrolyzed into micromolecular substances by macromolecular large-particle substances under hydrolytic acidification bacteria, and then is further degraded into volatile fatty acid and hydrogen under hydrogen-producing acetogenic bacteria, in the prior art, the volatile fatty acid is decomposed into methane under methanogenic bacteria, wherein the optimal pH value of the methanogenic bacteria is 6.8-7.5; the utility model controls the pH value to be more than 8.0 by adding alkali, preferably 8-9, thereby inhibiting the activity of methanogens, blocking the methanogenesis process, controlling the reactor process to be in the stage of producing hydrogen and acetic acid, further decomposing acetic acid into CO2；
2) Gaseous products (hydrogen, CO) produced after anaerobic fermentation2) Collected and utilized after passing through a gas-liquid separator 4;
3) the fermented initial fermentation liquor enters a drum screening machine 12 from a ninth pipeline through a water outlet device 5 for filtration and then enters an intermediate buffer tank 6 from a water producing port 13 of the drum screening machine for buffer storage through a tenth pipeline Q10; after the residues discharged from the residue producing port 14 of the drum screening machine enter an extruder 15 for further solid-liquid separation treatment, the separated liquid and the separated residues are respectively discharged from an eleventh pipeline Q11 and a twelfth pipeline Q12 and enter the next treatment link;
4) the cached initial fermentation liquid passes through a sludge inlet pump 8 and a sludge filter 9 from a third pipeline Q3 and then is filtered and filtered from a fourth pipeline Q4 to an external tubular membrane module 11, and the fermentation liquid after anaerobic acidogenesis is discharged through a fifth pipeline Q5; the membrane concentrated solution sequentially flows back to the intermediate cache tank 6 through a sixth pipeline Q6 and an eighth pipeline Q8, and then flows back to the anaerobic fermentation tank 3 from a second pipeline Q2 through an intermediate cache tank reflux pump 7; the circulation pump 10 provides a cross flow rate of 4-6m/s to the external tubular membrane module 11 to slow down membrane fouling.
Optionally, the membrane used in the utility model is a tubular membrane, the material used is a PVDF membrane, and the pure water flux of the PVDF membrane is 700L/m2h, bubble point 0.03, burst strength 4.2 MPa.
And (3) anaerobic fermentation results:
after 5-10 days of fermentation, the acid yield of the kitchen garbage is more than 30g/L, and the pH value of the obtained acidified fermentation liquor is 8-10;
the calcium phosphate precipitated in the reaction system is about 200mg/L, and the removal efficiency of the phosphorus reaches about 90 percent.
And the mass concentration of the organic acid/organic acid salt in the obtained dephosphorized fermentation liquor containing the organic acid/organic acid salt is more than 3 percent. Gaseous product H2And CO2In (H)2The mass concentration of the carbon dioxide is 40-70%, and the balance is CO2。
The present invention will be further described with reference to the following examples. The present invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the specific material ratios, process conditions and results thereof described in the examples are illustrative only and should not be taken as limiting the utility model as detailed in the claims.
Example 1
The anaerobic alkaline acidogenic process of the kitchen waste comprises the following three steps:
the processing object of the embodiment is kitchen waste, which is a mixture of filtered kitchen waste organic solid residue and kitchen waste water, and the weight ratio of the kitchen waste organic solid residue to the kitchen waste water is 8: 80. wherein the protein content of the organic solid residue (dry matter) of the kitchen residue is 19.6%; the COD of the kitchen waste water is 108480mg/L, the total nitrogen is 2156mg/L, and the total phosphorus is 227 mg/L.
The kitchen garbage is in a membrane anaerobic system, and NaOH and Ca (OH) are intermittently added through an alkali adding system2And fermenting to produce acid, wherein the pH value is maintained between 8.0 and 9.0 in the reaction process.
And (3) anaerobic fermentation results:
after 10 days of retention time, the acid yield of the kitchen garbage after fermentation is 60g/L, the pH of the obtained fermentation liquor is about 9, the concentration of total phosphorus is 10mg/L, and the concentration of ammonia nitrogen is 1154 mg/L;
gaseous product H2And CO2In (H)2Has a mass concentration of 64% and the balance of CO2。
Example 2
The anaerobic alkaline acidogenic process of the kitchen waste comprises the following three steps:
the object to be treated in this example was kitchen waste, which was centrifugally filtered, and had a COD of 108480mg/L, a total nitrogen of 2156mg/L and a total phosphorus of 227 mg/L.
The kitchen garbage is in a membrane anaerobic system, and NaOH and Ca (OH) are intermittently added through an alkali adding system2And fermenting to produce acid, wherein the pH value is maintained between 8.0 and 9.0 in the reaction process.
And (3) anaerobic fermentation results:
after 10 days of retention time, the acid yield of the kitchen garbage after fermentation is 50g/L, the pH of the obtained fermentation liquor is about 9, the concentration of total phosphorus is 9mg/L, and the concentration of ammonia nitrogen is 958 mg/L;
gaseous product H2And CO2In (H)2Has a mass concentration of 55% and the balance of CO2。
Example 3
The anaerobic alkaline acidogenic process of the kitchen waste comprises the following three steps:
the object to be treated in this example is kitchen waste, including filtered organic solid kitchen waste, wherein the protein content of the organic solid kitchen waste (dry matter) is 19.6%.
Before anaerobic fermentation, water is added to dilute and ferment the kitchen residue organic solid residue to make the mass concentration of the kitchen residue organic solid residue reach 10%.
The kitchen garbage is in a membrane anaerobic system, and Ca (OH) is intermittently added through an alkali adding system2And fermenting to produce acid, wherein the pH value is maintained between 8.0 and 9.0 in the reaction process.
And (3) anaerobic fermentation results:
after 10 days of retention time, the acid production of the kitchen garbage after fermentation is 45g/L, the pH of the obtained fermentation liquor is about 9, the concentration of total phosphorus is 7mg/L, and the concentration of ammonia nitrogen is 820 mg/L;
gaseous product H2And CO2In (H)2Has a mass concentration of 50% and the balance of CO2。
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the utility model and these are intended to be within the scope of the utility model.
Claims (7)
1. The kitchen waste alkaline acid production system is characterized by comprising an anaerobic acid production system and an alkali addition system, wherein the alkali addition system (II) is connected with the anaerobic acid production system (I); kitchen waste enters from the water inlet end of the anaerobic acid-producing system, and fermentation liquor containing organic acid/organic acid salt generated by the anaerobic acid-producing system is discharged from the water outlet of the anaerobic acid-producing system;
the anaerobic acidogenic system comprises an anaerobic fermentation tank (3), and a gas-liquid separator (4) is arranged at the top of the anaerobic fermentation tank (3);
the alkali adding system comprises an alkali tank (302), wherein an alkaline substance for adjusting the pH of the water body is stored in the alkali tank (302);
the alkali tank (302) is connected with the anaerobic fermentation tank (3).
2. The kitchen waste alkaline acid production system according to claim 1, further comprising a pH probe (301), a PLC (programmable logic controller) control system (303) and an alkali adding pump (304), wherein the pH probe (301) is located in the anaerobic fermentation tank (3), the pH probe (301) is in signal connection with the PLC control system (303), the PLC control system (303) is in control connection with the alkali adding pump (304), and the alkali adding pump (304) is in pipeline connection with the alkali tank (302);
when the detection signal of the pH probe (301) reaches a set value, the PLC control system (303) controls the alkali adding pump (304) to be started, and the alkaline substances in the alkali tank (302) are conveyed to the alkaline substances in the anaerobic fermentation tank (3).
3. The system for alkaline production of acid from kitchen waste as claimed in claim 2, wherein the set value is pH 8-10.
4. The kitchen waste alkaline acid production system according to claim 1, wherein the anaerobic acid production system is a membrane anaerobic system, the membrane anaerobic system comprises an anaerobic fermentation tank (3), a water outlet device (5), a middle buffer tank (6) and an external tubular membrane module (11), the anaerobic fermentation tank (3), the water outlet device (5), the middle buffer tank (6) and the water inlet end and the water outlet end of the external tubular membrane module (11) are sequentially connected through a pipeline, and fermentation liquor containing the organic acid/organic acid salt generated by the anaerobic acid production system is discharged from the water outlet end of the external tubular membrane module (11); the external tubular membrane component (11) is formed by connecting a plurality of membrane tubes through elbows (16).
5. The system for alkaline acidogenesis of kitchen waste as claimed in claim 4, wherein the membrane anaerobic system further comprises a drum screening machine (12), a sludge filter (9);
the water inlet end and the water outlet end of the water outlet device (5), the drum screening machine (12), the middle buffer tank (6), the sludge filter (9) and the tubular membrane component (11) are sequentially connected through pipelines.
6. The kitchen waste alkaline acid production system according to claim 4, wherein the concentrated solution outlet end of the external tubular membrane module (11) is connected with the backflow water inlet end of the intermediate buffer tank (6), the backflow water outlet end of the intermediate buffer tank (6) is connected with the backflow water inlet end of the anaerobic fermentation tank (3), and the external tubular membrane module (11), the intermediate buffer tank (6) and the anaerobic fermentation tank (3) form a concentrated solution backflow circulation system.
7. The system for alkaline acid production of kitchen waste according to claim 4, wherein the inlet end of the external tubular membrane module (11) is connected with a circulating pump (10), and the cross flow rate of the inlet end of the external tubular membrane module (11) is controlled to be 4-6 m/s.
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| CN113150969A (en) * | 2021-04-09 | 2021-07-23 | 无锡马盛环境能源科技有限公司 | System and method for producing acid by kitchen waste alkaline |
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| CN113150969A (en) * | 2021-04-09 | 2021-07-23 | 无锡马盛环境能源科技有限公司 | System and method for producing acid by kitchen waste alkaline |
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