CN105000928A - Device and method for preventing acidification during mixed anaerobic fermentation by automatically regulating and controlling alkalinity - Google Patents
Device and method for preventing acidification during mixed anaerobic fermentation by automatically regulating and controlling alkalinity Download PDFInfo
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- CN105000928A CN105000928A CN201510438564.8A CN201510438564A CN105000928A CN 105000928 A CN105000928 A CN 105000928A CN 201510438564 A CN201510438564 A CN 201510438564A CN 105000928 A CN105000928 A CN 105000928A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a device and method for preventing acidification during mixed anaerobic fermentation by automatically regulating and controlling alkalinity. The device comprises an anaerobic fermentation tank, a stirring system, an alkalinity online monitoring system and an automatic buffer solution supplementing system. The alkalinity online monitoring system comprises an alkalinity controller, a buzzer, an alkalinity online monitoring electrode A, an alkalinity online monitoring electrode B and an alkalinity online monitoring electrode C. The automatic buffer solution supplementing system comprises a buffer solution controller, a solution supplementing tank and a liquid inlet pipe. According to the device, the alkalinity online monitoring system is used for giving an early warning in time when the buffer capacity drops in the fermentation process; the automatic buffer solution supplementing system is used for conducting rapid adjustment to effectively prevent acidification in the mixed fermentation process. The whole device is easy and convenient to operate, economical, safe and capable of saving manpower greatly, the economic benefits of the mixed fermentation engineering is effectively increased, and the production efficiency of the mixed fermentation engineering is effectively improved.
Description
Technical field
The present invention relates to environmental protection and field of renewable energy, particularly a kind ofly apply the mixed fermentation acidifying of auto-adjustment control technical prevention and realize the devices and methods therefor of a kind of auto-control basicity prevention anaerobic mixed fermentation acidifying that process stabilizing runs.
Background technology
The Appropriate application of the energy has become the major issue of impact and restriction human kind sustainable development.Biomass energy belongs to renewable energy source, is the new forms of energy development field that current state key is encouraged.Wherein, mixed fermentation is that the recycling of the organic waste such as agricultural crop straw and human and animal excreta provides effective way, is the important channel realizing agricultural wastes recycling.Various materials hybrid anaerobic fermentation technology, can avoid single raw material anaerobic fermentation defect, improves biogas fermentation aerogenesis efficiency, thus solves environmental pollution and Energy production problem expeditiously.
In practical engineering application, due to the impact of the objective factors such as seasonal variation, material properties easily fluctuates, and causes the surge capability of mixed fermentation internal system carbon-nitrogen ratio and system unstable, thus easily causes acidifying problem, cause system crash.In mixed fermentation, the process of non-methanogen degradation of organic substances can produce a large amount of voltaile fatty acids (VFA) and CO
2, obvious reduction system pH; Methanogen is consumption acids and CO in the process utilizing acetic acid, formic acid, hydrogen evolution methane then
2.Both acting in conjunction can make pH in reaction system be stabilized in a suitable scope, and organism is successfully decomposed, and produces methane.But for non-methanogen, methanogen is all very sensitive to temperature, pH, basicity, carbon-nitrogen ratio and toxic substance etc., and the optimum range of various factors is all narrower, requires harsher.So when the influence factors such as temperature, pH, basicity in system or organic loading acute variation, the activity of methanogen can be suppressed to a certain extent, but not impact suffered by methanogen activity is less, its VFA produced can not all be utilized by methanogen, VFA in anaerobic system is accumulated in a large number, and the metabolic balance of two large bacterioids is destroyed.Thus the condition such as temperature, pH, basicity, carbon-nitrogen ratio all can cause the generation of acidification phenomenon.Occur in the system of acidifying, VFA accumulates in a large number, inhibits the activity of methanobacteria.Even, according to forefathers' experience, when VFA is more than 8.87mmol/L, methanobacteria mortality.Acidifying problem is the key factor of the Fermentation efficiency lifting of restriction high efficient mixed and steady running, has become focus and the difficult point of mixed fermentation research.
Although pH is the best indicator of subsequent anaerobic digestion stability, when the pH value that can detect in system exceeds zone of reasonableness, there is acidifying in internal system already, is difficult to reverse.PH depends on CO as the indicator of fermentable activity
2dividing potential drop and fermented liquid in the balance of acid-base material, and basicity can stablize the pH value of fermented liquid, and it has reacted the surge capability of Digestive tract.When basicity reduces, exceed threshold value, imply that system buffer ability declines, acidifying problem will be produced.If can detect that in system, basicity reduces in time, can safeguard system before pH starts to decline, supplement basicity, regulation system balances, and effectively can prevent the acidifying problem in mixed fermentation.
Summary of the invention
For solving the problem, the present invention proposes the devices and methods therefor of a kind of auto-control basicity prevention anaerobic mixed fermentation acidifying, not only stable system can run, improves the utilization ratio of mixture, avoid financial loss simultaneously, improve production efficiency and the economic benefit of Practical Project.The object of the invention is to apply the problem timely early warning of basicity on-line monitoring system to surge capability decline in mixed fermentation system, and regulated rapidly by damping fluid JUMPS Automated Supplemental System, effectively produce acidifying problem in prevention mixed fermentation process.
For achieving the above object, the present invention adopts technical scheme:
The device of a kind of auto-control basicity prevention anaerobic mixed fermentation acidifying, the timely early warning of problem that described device adopts basicity on-line monitoring system to decline to surge capability in fermenting process, and regulated rapidly by damping fluid JUMPS Automated Supplemental System, produce acidifying in prevention mixed fermentation process.
Further, described device comprises: anaerobic fermentation tank, stirring system, basicity on-line monitoring system, damping fluid JUMPS Automated Supplemental System, described basicity on-line monitoring system comprises: basicity controller, hummer, basicity on-line monitoring electrode A, basicity on-line monitoring electrode B, basicity on-line monitoring electrode C, described damping fluid JUMPS Automated Supplemental System comprises: damping fluid controller, sealant supplement cylinder and liquid-inlet pipe.
Further, described basicity on-line monitoring electrode A, basicity on-line monitoring electrode B are connected with described anaerobic fermentation tank respectively with basicity on-line monitoring electrode C, the detecting end of described basicity on-line monitoring electrode A, basicity on-line monitoring electrode B and basicity on-line monitoring electrode C is arranged at top in fermentor tank, middle part and bottom respectively, and described basicity on-line monitoring electrode A, basicity on-line monitoring electrode B are all connected with the input terminus of described basicity controller with the other end of basicity on-line monitoring electrode C.
Further, described hummer is connected with an output terminal of described basicity controller, and another output terminal of described basicity controller is connected with the input terminus of described damping fluid controller; The output terminal of described damping fluid controller is connected with the input terminus of described sealant supplement cylinder; The output terminal of described sealant supplement cylinder is connected with the entrance of liquid-inlet pipe; The outlet of described liquid-inlet pipe is arranged at the top of anaerobic fermentation tank.
Further, described stirring system is arranged on anaerobic fermentation tank inside.
Further, the damping fluid of described damping fluid JUMPS Automated Supplemental System adopts the sodium carbonate of 1mol/L sodium bicarbonate or 1mol/L.
Further, described sealant supplement cylinder, liquid-inlet pipe, stirring system, basicity on-line monitoring electrode A, B, C material all adopt corrosion resistant material.
A method for auto-control basicity prevention anaerobic mixed fermentation acidifying, the device of the auto-control basicity prevention anaerobic mixed fermentation acidifying described in described method adopts, said method comprising the steps of:
Step 1) adds two or three mixture adopting stalk and human and animal excreta or other organic waste in anaerobic fermentation tank, regulates its pH to be that between 7-7.5, solids concn is about 8%, heat and remain on 37 ± 1 DEG C before reaction starts;
Step 2) start reaction, adopt stirring system to be stirred by mixture, by the basicity value data being separately positioned on three basicity on-line monitoring electrode A in the upper, middle and lower portion of anaerobic fermentation tank, B, C detect material in real time;
Step 3) basicity on-line monitoring electrode A, B, C provide data testing signals respectively to the data collecting card in basicity controller, by the statistical study of basicity controller, subsequently, liquid crystal display on basicity controller shows basicity value and the average of three monitoring points respectively, and draws the instant curve of cyclical fluctuations;
Step 4), when basicity average is in the scope of 1000-2000mg/L, carries out step 5), otherwise carries out step 6);
Step 5) hummer and buffering fluid controller are in static state, return step 3);
Step 6) basicity controller sends signal to hummer, the early warning of hummer sounding, and when basicity average is lower than 1000mg/L, display detects basicity value and carries out step 7);
Step 7) basicity controller sends signal to damping fluid controller, damping fluid controller starts, damping fluid controller sends switch signal to the magnetic valve in sealant supplement cylinder, in anaerobic fermentation tank, quantitative damping fluid is added through liquid-inlet pipe by flow and accumulated time value according to the basicity value detected, it is made to return in basicity normal range value (1000-2000mg/L), supplement once in the one-period 10min that complete and damping fluid plays a role at damping fluid, basicity controller no longer sends working signal to it, returns step 3).
The present invention can realize whole day 24h unmanned and automatically carry out DATA REASONING to basicity in hybrid anaerobic fermentation tank, by basicity changing conditions in basicity controller automatic analysis system, when basicity is not in effective threshold range, system acidifying early warning, and send working signal to damping fluid controller, make it automatically calculate damping fluid addition and control sealant supplement cylinder and in anaerobic fermentation tank, add damping fluid in time, system recovery normally runs, before the non-acute variation of system pH and bacterial classification lose efficacy, effectively prevented acidifying problem.Whole plant is easy and simple to handle, economic security, saves a large amount of manpower, and effectively improves economic benefit and the production efficiency of mixed fermentation engineering.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of a kind of auto-control basicity prevention anaerobic mixed fermentation of the present invention acidifying.
In figure:
1-anaerobic fermentation tank, 2-stirring system, 3-basicity controller, 4-hummer, 5-basicity on-line monitoring electrode A, 6-basicity on-line monitoring electrode B, 7-basicity on-line monitoring electrode C, 8-damping fluid controller, 9-sealant supplement cylinder, 10-liquid-inlet pipe.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is explained in further detail.Should be appreciated that specific embodiment described herein only for explaining the present invention, being not intended to limit the present invention.
On the contrary, the present invention is contained any by the substituting of making on marrow of the present invention and scope of defining of claim, amendment, equivalent method and scheme.Further, in order to make the public have a better understanding to the present invention, in hereafter details of the present invention being described, detailedly describe some specific detail sections.Do not have the description of these detail sections can understand the present invention completely for a person skilled in the art yet.Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
As shown in Figure 1, the device of a kind of auto-control basicity prevention anaerobic mixed fermentation acidifying, described device comprises: anaerobic fermentation tank 1, stirring system 2, basicity on-line monitoring system, damping fluid JUMPS Automated Supplemental System, described basicity on-line monitoring system comprises: basicity controller 3, hummer 4, basicity on-line monitoring electrode A 5, basicity on-line monitoring electrode B 6, basicity on-line monitoring electrode C 7, described damping fluid JUMPS Automated Supplemental System comprises: damping fluid controller 8, sealant supplement cylinder 9 and liquid-inlet pipe 10.
It is inner that described stirring system 2 is arranged on anaerobic fermentation tank 1, for stirring the mixture in anaerobic fermentation tank 1, described basicity on-line monitoring electrode A 5, basicity on-line monitoring electrode B 6 is connected with described anaerobic fermentation tank 1 respectively with basicity on-line monitoring electrode C 7, described basicity on-line monitoring electrode A 5, the detecting end of basicity on-line monitoring electrode B 6 and basicity on-line monitoring electrode C 7 is arranged at the top in described anaerobic fermentation tank 1 respectively, middle part and bottom, described basicity on-line monitoring electrode A 5, basicity on-line monitoring electrode B 6 is all connected with the input terminus of described basicity controller 3 with the other end of basicity on-line monitoring electrode C 7.
Described hummer 4 is connected with an output terminal of described basicity controller 3, and another output terminal of described basicity controller 3 is connected with the input terminus of described damping fluid controller 8; The output terminal of described damping fluid controller 8 is connected with the input terminus of described sealant supplement cylinder 9; The output terminal of described sealant supplement cylinder 9 is connected with the entrance of liquid-inlet pipe 10; The outlet of described liquid-inlet pipe 10 is arranged at the top of anaerobic fermentation tank 1.
Described sealant supplement cylinder, liquid-inlet pipe, stirring system, basicity on-line monitoring electrode A, B, C material all adopt corrosion resistant material.
Damping fluid adopts the sodium carbonate of 1mol/L sodium bicarbonate or 1mol/L, notes supplementing in time upgrading damping fluid in operational process.
Described basicity controller 3 installs programmable logic controller and data collecting card, by basicity on-line monitoring electrode A, B, C monitors the basicity value in anaerobic fermentation tank in real time, and show instant basicity value and the curve of cyclical fluctuations by liquid crystal display, when basicity value is down to 1000mg/L, basicity controller sends signal to damping fluid controller 8, damping fluid controller 8 outside is provided with can the liquid crystal display of touch control operation, the useful volume of anaerobic fermentation tank 1 is pre-set before reaction, (redness is dynamic to the working order of liquid crystal display also display buffer fluid controller 8 in addition, green is static) and dynamically time damping fluid dosage.Damping fluid controller 8 calculates the dosage of damping fluid automatically according to the effective volume of fermented product in the fall signal power of basicity average and anaerobic fermentation tank 1; After calculating completes, damping fluid controller 8 sends switch signal to the magnetic valve in sealant supplement cylinder 9, adds quantitative damping fluid by flow and accumulated time value through liquid-inlet pipe 10 in anaerobic fermentation tank 1; Under the effect of stirring system 2, damping fluid is evenly distributed in anaerobic fermentation tank 1 subsequently, system buffer ability recovers normal, by the adjustment of basicity controller 3, early warning removed by hummer 4, damping fluid controller 8 is in static state again, complete the adjustment of an anaerobic mixed fermentation system buffer ability, described basicity is effective alkalinity, and to be 6.5 be in terminal and the ability of strong acid with pH to be reaction system.
A method for auto-control basicity prevention anaerobic mixed fermentation acidifying, described method adopts above-described auto-control basicity to prevent the device of anaerobic mixed fermentation acidifying, said method comprising the steps of:
Step 1) adds two or three mixture adopting stalk and human and animal excreta or other organic waste in anaerobic fermentation tank 1, regulates its pH to be that between 7-7.5, solids concn is about 8%, heat and remain on 37 ± 1 DEG C before reaction starts;
Step 2) start reaction, adopt stirring system 2 to be stirred by mixture, by the basicity value data being separately positioned on three basicity on-line monitoring electrode A 5 in the upper, middle and lower portion of anaerobic fermentation tank 1, B6, C7 detect material in real time;
Step 3) basicity on-line monitoring electrode A 5, B6, C7 provide data testing signals respectively to the data collecting card in basicity controller 3, by basicity controller 3 statistical study, subsequently, liquid crystal display on basicity controller 3 shows basicity value and the average of three monitoring points respectively, and draws the instant curve of cyclical fluctuations;
Step 4), when basicity average is in the scope of 1000-2000mg/L, carries out step 5), otherwise carries out step 6);
Step 5) hummer 4 and buffering fluid controller 8 are in static state, return step 3);
Step 6) basicity controller sends signal to hummer, the early warning of hummer sounding, and when basicity average is lower than 1000mg/L, display detects basicity value and carries out step 7);
Step 7) basicity controller sends signal to damping fluid controller, damping fluid controller starts, damping fluid controller sends switch signal to the magnetic valve in sealant supplement cylinder, in anaerobic fermentation tank, quantitative damping fluid is added through liquid-inlet pipe by flow and accumulated time value according to the basicity value detected, it is made to return in basicity normal range value (1000-2000mg/L), supplement once in the one-period 10min that complete and damping fluid plays a role at damping fluid, basicity controller no longer sends working signal to it, returns step 3).
The present invention can realize whole day 24h unmanned and automatically carry out DATA REASONING to basicity in hybrid anaerobic fermentation tank, by basicity changing conditions in basicity controller automatic analysis system, when basicity is not in effective threshold range, system acidifying early warning, and send working signal to damping fluid controller, make it automatically calculate damping fluid addition and control sealant supplement cylinder and in anaerobic fermentation tank, add damping fluid in time, system recovery normally runs, before the non-acute variation of system pH and bacterial classification lose efficacy, effectively prevented acidifying problem.Whole plant is easy and simple to handle, economic security, saves a large amount of manpower, and effectively improves economic benefit and the production efficiency of mixed fermentation engineering.
Claims (8)
1. the device of auto-control basicity prevention anaerobic mixed fermentation acidifying, it is characterized in that, the timely early warning of problem that described device adopts basicity on-line monitoring system to decline to surge capability in fermenting process, and regulated rapidly by damping fluid JUMPS Automated Supplemental System, produce acidifying in prevention mixed fermentation process.
2. the device of auto-control basicity prevention anaerobic mixed fermentation according to claim 1 acidifying, it is characterized in that, described device comprises: anaerobic fermentation tank, stirring system, basicity on-line monitoring system, damping fluid JUMPS Automated Supplemental System, described basicity on-line monitoring system comprises: basicity controller, hummer, basicity on-line monitoring electrode A, basicity on-line monitoring electrode B, basicity on-line monitoring electrode C, described damping fluid JUMPS Automated Supplemental System comprises: damping fluid controller, sealant supplement cylinder and liquid-inlet pipe.
3. the device of auto-control basicity prevention anaerobic mixed fermentation according to claim 2 acidifying, it is characterized in that, described basicity on-line monitoring electrode A, basicity on-line monitoring electrode B is connected with described anaerobic fermentation tank respectively with basicity on-line monitoring electrode C, described basicity on-line monitoring electrode A, the detecting end of basicity on-line monitoring electrode B and basicity on-line monitoring electrode C is arranged at the top in fermentor tank respectively, middle part and bottom, described basicity on-line monitoring electrode A, basicity on-line monitoring electrode B is all connected with the input terminus of described basicity controller with the other end of basicity on-line monitoring electrode C.
4. the device of auto-control basicity prevention anaerobic mixed fermentation according to claim 2 acidifying, it is characterized in that, described hummer is connected with an output terminal of described basicity controller, and another output terminal of described basicity controller is connected with the input terminus of described damping fluid controller; The output terminal of described damping fluid controller is connected with the input terminus of described sealant supplement cylinder; The output terminal of described sealant supplement cylinder is connected with the entrance of liquid-inlet pipe; The outlet of described liquid-inlet pipe is arranged at the top of anaerobic fermentation tank.
5. the device of auto-control basicity prevention anaerobic mixed fermentation according to claim 2 acidifying, it is characterized in that, described stirring system is arranged on anaerobic fermentation tank inside.
6. the device of auto-control basicity prevention anaerobic mixed fermentation according to claim 2 acidifying, it is characterized in that, the damping fluid of described damping fluid JUMPS Automated Supplemental System adopts the sodium carbonate of 1mol/L sodium bicarbonate or 1mol/L.
7. the device of auto-control basicity prevention anaerobic mixed fermentation according to claim 2 acidifying, it is characterized in that, described sealant supplement cylinder, liquid-inlet pipe, stirring system, basicity on-line monitoring electrode A, B, C material all adopt corrosion resistant material.
8. a method for auto-control basicity prevention anaerobic mixed fermentation acidifying, described method adopts the device of the auto-control basicity prevention anaerobic mixed fermentation acidifying as described in claim 1-7, it is characterized in that, said method comprising the steps of:
Step 1) adds two or three mixture adopting stalk and human and animal excreta or other organic waste in anaerobic fermentation tank, regulates its pH to be that between 7-7.5, solids concn is about 8%, heat and remain on 37 ± 1 DEG C before reaction starts;
Step 2) start reaction, adopt stirring system to be stirred by mixture, by the basicity value data being separately positioned on three basicity on-line monitoring electrode A in the upper, middle and lower portion of anaerobic fermentation tank, B, C detect material in real time;
Step 3) basicity on-line monitoring electrode A, B, C provide data testing signals respectively to the data collecting card in basicity controller, by the statistical study of basicity controller, subsequently, liquid crystal display on basicity controller shows basicity value and the average of three monitoring points respectively, and draws the instant curve of cyclical fluctuations;
Step 4), when basicity average is in the scope of 1000-2000mg/L, carries out step 5), otherwise carries out step 6);
Step 5) hummer and buffering fluid controller are in static state, return step 3);
Step 6) basicity controller sends signal to hummer, the early warning of hummer sounding, and when basicity average is lower than 1000mg/L, display detects basicity value and carries out step 7);
Step 7) basicity controller sends signal to damping fluid controller, damping fluid controller starts, damping fluid controller sends switch signal to the magnetic valve in sealant supplement cylinder, in anaerobic fermentation tank, quantitative damping fluid is added through liquid-inlet pipe by flow and accumulated time value according to the basicity value detected, it is made to return in basicity normal range value (1000-2000mg/L), supplement once in the one-period 10min that complete and damping fluid plays a role at damping fluid, basicity controller no longer sends working signal to it, returns step 3).
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Application publication date: 20151028 |