CN111732460A - Sludge compost odor control method and system - Google Patents
Sludge compost odor control method and system Download PDFInfo
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- CN111732460A CN111732460A CN202010641099.9A CN202010641099A CN111732460A CN 111732460 A CN111732460 A CN 111732460A CN 202010641099 A CN202010641099 A CN 202010641099A CN 111732460 A CN111732460 A CN 111732460A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/70—Controlling the treatment in response to process parameters
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
- C05F17/964—Constructional parts, e.g. floors, covers or doors
- C05F17/971—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material
- C05F17/979—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material the other material being gaseous
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
- C05F17/993—Arrangements for measuring process parameters, e.g. temperature, pressure or humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B15/00—Systems controlled by a computer
- G05B15/02—Systems controlled by a computer electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/303—Temperature
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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Abstract
The invention belongs to the technical field of environmental protection, and relates to a sludge compost odor control method and a system thereof. The sludge compost odor control method comprises the following steps: the temperature real-time online monitoring system monitors the temperature of the stack in real time, and the intelligent monitoring system adjusts the operation of a blower below the stack in real time according to the change of the temperature of the stack; an odor monitoring system is arranged in the intelligent aerobic fermentation equipment, so that the odor concentration is monitored in real time, and a signal is transmitted to a central control system, thereby controlling the operation of the deodorization system. According to the sludge compost odor control method and the system thereof, the operating frequency and time of the blower can be adjusted in real time according to the temperature change of the compost through the real-time online temperature monitoring system and the intelligent control system, so that the aerobic state of the compost and the harmless temperature requirement of harmful substances are fully ensured.
Description
Technical Field
The invention belongs to the technical field of environmental protection, relates to compost odor control, and particularly relates to a sludge compost odor control method and a sludge compost odor control system.
Background
Composting is a main means for reducing, harmlessly treating and recycling municipal sludge, and no good solution exists at present how to control odor generated in the operation of a sludge composting plant. In the 60 s of the 20 th century there were many municipal sludge composting plants in the united states that were forced to shut down due to odor problems. In recent years, a batch of sludge treatment plants are successively built in China, but the odor control problem is hardly solved during construction. To mitigate the impact of sludge composting plants on the environment surrounding the plant area, the deodorizing system of the composting plant must be redesigned.
When oxygen is sufficient in the composting process, organic components in the materials, such as protein and the like, can generate irritant gas (NH) under the action of aerobic bacteria3Etc.); when oxygen is insufficient, anaerobic bacteria can break down organic matter into incomplete oxidation products, such as sulfur-containing compounds (H)2S、SO2Thiols, etc.), nitrogen-containing compounds (amines, amides, etc.). Malodorous gases can be produced both under aerobic and anaerobic conditions, the main odoriferous substances coming from the anaerobic process. However, even under sufficient aerobic conditions, the pile body can generate a small amount of odor-causing substances, such as ammonia, acetic acid, pyruvic acid, citric acid and the like, but can not generate obvious odor and has small influence on the health of human bodies.
The composition of the odor of the composting plant is mainly sulfur-containing compounds, nitrogen-containing compounds and volatile organic pollutants (VOCs). The nitrogen-containing malodorous substances are mainly ammonia, amines, indoles and skatole, of which ammonia is of the most concern. The phenomenon of nitrogen loss generally exists in the high-temperature composting process, the nitrogen loss rate can reach 30-50 percent generally, and even reaches 68 percent in sludge composting. Ammonia is produced in both aerobic and anaerobic degradation of proteins and amino acids, the ammonia release during composting is large, the ammonia concentration during sludge composting can be as high as 1000mg/kg, but the ammonia odor threshold is relatively high, and generallyIt is considered to be a relatively minor malodorous substance. Although sulfur-containing malodorous compounds such as hydrogen sulfide, methyl mercaptan, methyl sulfide and dimethyl disulfide (DMDS) are produced in amounts less than NH3But their threshold is very low and thus contributes significantly to the overall malodor.
The release of odor is generally mainly concentrated in the first 2 to 3 weeks of the composting process, with the odor concentration reaching a maximum at the end of week 1 and the ammonia concentration reaching a peak (400mg/L) at day 16, as detected from week 2 of the composting. As the composting temperature increases, the emission of methane, methanol, volatile organic compounds and odor increases. Along with the stabilization of the materials in the composting process, the generation of odor is gradually reduced. The higher the temperature is, the higher the pH is, the more the ammonia gas is volatilized and lost, and in the actual composting process, if the temperature is not controlled, the temperature of the compost can be as high as 75-80. Temperature control is a method of reducing odor and temperature regulation is achieved primarily through ventilation and heat dissipation.
Because the sludge composting workshop occupies a large area, the fermentation heap tank is difficult to physically divide, the whole workshop ventilation is generally required to be considered when the deodorization air quantity is calculated, the ventilation frequency is not less than 8 times/h, the deodorization investment is large, the deodorization cost is reduced, and meanwhile, the odor collection treatment can be effectively carried out, which becomes very important.
Disclosure of Invention
The invention aims to provide a sludge compost odor control method and a system thereof aiming at the defects of the prior art.
Specifically, the odor control method for sludge compost comprises the following steps:
the temperature real-time online monitoring system monitors the temperature of the stack in real time, and the intelligent monitoring system adjusts the operation of a blower below the stack in real time according to the change of the temperature of the stack;
an odor monitoring system is arranged in the intelligent aerobic fermentation equipment, so that the odor concentration is monitored in real time, and a signal is transmitted to a central control system, thereby controlling the operation of the deodorization system.
The odor control method for sludge compost further comprises the following steps: and an odor collecting system is arranged above the stack body, and the running air volume of the odor collecting system and the turning equipment are subjected to linkage control.
According to the sludge compost odor control method, when the odor concentration is higher than the threshold value, the odor monitoring system sends out an alarm signal.
According to the sludge compost odor control method, odor collected by the odor collection system is conveyed to the prewashing-biofilter deodorization equipment.
According to the method for controlling odor of sludge compost, the compost body is maintained for more than 6 days at the high temperature of 55-65 ℃.
According to the method for controlling the odor of the sludge compost, the operation time of the turning equipment per day is less than 4 hours.
According to the sludge compost odor control method, the odor collection system and the turning equipment are controlled in a linkage manner, so that the deodorizing air quantity is reduced by 30% -40%.
The invention also provides a sludge compost odor control system, which comprises:
the temperature real-time online monitoring system is used for monitoring the temperature of the stack in real time;
the blower is used for adjusting the aerobic state and the temperature of the pile body;
the intelligent monitoring system is used for receiving the stack temperature signal and controlling the operation of the blower according to the stack temperature signal;
the odor monitoring system is used for monitoring the odor concentration in the intelligent aerobic fermentation equipment;
a deodorizing system for decomposing odor;
the central control system is used for receiving the odor concentration signal and controlling the operation of the deodorization system according to the odor concentration signal;
the temperature real-time online monitoring system, the blower and the intelligent monitoring system are electrically connected; the odor monitoring system, the deodorization system and the central control system are electrically connected.
The above-mentioned sludge compost odor control system still includes: the odor collecting system is used for collecting odor emitted by the pile body; and the turning equipment is used for turning and pushing the stack body to increase the oxygen content in the stack body materials.
In the sludge composting odor control system, the odor collection system comprises a horn-shaped air suction cover and an electric air valve; wherein, the electric air valve is arranged at the rear end of the air suction cover.
The technical scheme of the invention has the following beneficial effects:
(1) according to the sludge compost odor control method and the system thereof, the operating frequency and time of the blower can be adjusted in real time according to the temperature change of the compost body through the real-time online temperature monitoring system and the intelligent control system, so that the aerobic state of the compost body and the harmless temperature requirement of harmful substances are fully ensured;
(2) according to the sludge compost odor control method and system, a perfect odor monitoring device is arranged in the integrated intelligent aerobic fermentation equipment, so that real-time online monitoring of odor concentration can be realized, signals are transmitted to the central control system in real time, the opening and closing of the deodorization system are controlled, and when the concentration of harmful gases in the fermentation equipment exceeds a threshold value, the monitoring device can send out an alarm signal, so that the health of workers is prevented from being harmed and safety accidents are avoided;
(3) according to the sludge compost odor control method and system, the operating air volume of the deodorization system can be obviously reduced through the interlocking control of the odor collection system and the turning equipment, so that the amount of deodorized sludge is greatly reduced, and the project investment and the operating cost are reduced.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
In one aspect, the method for controlling odor of sludge compost comprises the following steps: the temperature real-time online monitoring system monitors the temperature of the stack in real time, and the intelligent monitoring system adjusts the operation of a blower below the stack in real time according to the change of the temperature of the stack; an odor monitoring system is arranged in the intelligent aerobic fermentation equipment, so that the odor concentration is monitored in real time, and a signal is transmitted to a central control system, thereby controlling the operation of the deodorization system.
Different from the traditional fermentation process, the sludge compost odor control method disclosed by the invention is an integrated intelligent aerobic fermentation process, and the operating frequency and time of the blower can be adjusted in real time according to the temperature change of the compost through the real-time temperature online monitoring system and the intelligent control system, so that the aerobic state of the compost and the temperature requirement for harmless harmful substances are fully ensured. Because the invention adopts the best oxygen supply mode, the invention avoids releasing a large amount of malodorous gas due to the anaerobic reaction of the stack body and reduces the discharge amount of odor from the source.
In order to protect the health of workers, the invention arranges a perfect odor monitoring device in the integrated intelligent aerobic fermentation equipment to realize odor (such as H)2S、NH3) And (3) monitoring the concentration in real time on line, transmitting signals to the central control system in real time, and controlling the opening and closing of the deodorization system. When the concentration of harmful gas in the fermentation equipment exceeds a threshold value, the monitoring device can send out an alarm signal, so that the health of staff is prevented from being harmed and safety accidents are avoided.
Most of odor of sludge compost comes from a sludge fermentation tank, and the generation amount and concentration of odor gradually increase along with the fermentation time. On one hand, the lower part of the fermentation tank is aerated by a blower to provide oxygen, the process of providing the oxygen can cause the further release of gas, and in addition, in order to improve the enough oxygen content, the stack body is prevented from generating an anaerobic environment to generate reductive odor components such as hydrogen sulfide and the like as far as possible, so the stack body is loosened and ventilated by turning over the stack body to increase the oxygen content in the materials. Therefore, turning over is a necessary process means for compost fermentation, and provides good help for metabolism of fermenting microorganisms. However, the turning operation often causes a large amount of odor accumulated in the stack to be stirred and escape, the instantaneous generation amount is sharply enlarged, the air environment of a working space is deteriorated in a short time, and the human health is seriously harmed.
Based on this, in some preferred embodiments, the sludge composting odor control method of the present invention further comprises: and an odor collecting system is arranged above the stack body, and the running air volume of the odor collecting system and the turning equipment are subjected to linkage control.
Specifically, odor collecting system includes the cover that induced drafts of horn type, ensures that the area of induced drafting is big enough, strengthens the air disturbance scope of piling up the body top. Meanwhile, the rear end of the air suction opening is provided with an electric air valve, and the electric air valve and the turning and throwing equipment are controlled to be in interlocking control.
Wherein, the control logic is: when the stack body is turned, the electric air valve above the corresponding stack body is set to be fully opened, the electric air valves of the air suction ports above the stack body for other static fermentation are selected to be properly opened (generally set to be half-opened), a plurality of general fermentation tanks are arranged, and turning operation is carried out in turn.
The invention can obviously reduce the running air quantity of the deodorization system and greatly reduce the deodorization quantity by interlocking control of the running air quantity of the odor collecting system and the turning equipment, thereby reducing the project investment and the running cost. Wherein, the deodorizer amount refers to the deodorizing air volume, namely the air volume processed per hour, and the unit is cubic meter per hour. By the interlocking control of the invention, the deodorization air quantity can be saved by about 30-40%.
Because the waste gas generated by the aerobic fermentation of the sludge has complex components, higher concentration, is generally acidic, and is unstable and can generate instant fluctuation and load impact, the integrated intelligent aerobic fermentation equipment disclosed by the invention is matched with a combined odor treatment system of prewashing-biofilter deodorization equipment. And conveying the odor collected by the odor collection system to a prewashing-biofilter deodorization device.
Wherein, the prewashing-biological filter deodorization equipment comprises a water washing unit and a biological filtering unit.
Wherein, the water washing unit adopts a filler type water washing tower. The purpose of the water wash is primarily to further remove a portion of the soluble off-gases and dust. The water washing adopts factory water as a water source, and the water is periodically supplemented to enter the system and is simultaneously discharged in an overflowing manner. The amount of make-up water is determined according to the salt content of the system. The control can be carried out through online equipment, and the water replenishing quantity can be determined according to time after the system is normally debugged. In view of saving engineering investment, the proposal suggests that the water supply quantity is determined according to time.
The core of the biological filtering unit is a high-efficiency deodorizing biological filter, a composite biological filler and microbial strains which are beneficial to biological attachment and growth, so that microorganisms form a biological film on the surface of the composite filler under the appropriate environmental conditions in the biological filter, the microorganisms in the biological film utilize inorganic and organic matters in waste gas as carbon sources and energy sources, maintain the life activity of the malodorous substances by degrading the malodorous substances, and decompose the malodorous substances into odorless substances such as water, carbon dioxide, mineral substances and the like, thereby achieving the purpose of purifying the malodorous gases.
In the invention, after the fermentation process is started, aerobic microorganisms are rapidly proliferated at the initial stage of fermentation, the temperature of a pile is rapidly increased, and fermentation enters a high-temperature stage after 1-2 days. The fermentation pile body is controlled by an integrated fermentation equipment automatic monitoring and control system to be maintained at the high temperature stage of 55-65 ℃ for not less than 6 days only by the high temperature formed by the self-fermentation heat of the materials without any heating device, so that the aims of fully killing pathogenic bacteria and weed seeds and realizing the harmlessness and stabilization of the materials are fulfilled. And (3) adjusting the turnover frequency and the turnover speed of the turnover equipment of the integrated fermentation equipment according to the sludge treatment capacity and the fermentation period while performing static aeration, so that materials at different positions are uniformly mixed and smashed, and the quality of a fermentation product is improved.
The turning and throwing device adopted by the invention is a turning and throwing machine mature in the field, the turning and throwing operation of the turning and throwing machine is completed once from the discharge end to the feed end in different fermentation areas, the turning and throwing efficiency is high, the secondary mixing, crushing and turning and throwing effects of materials are good, and the pore difference of different positions of a pile body is eliminated. In the process of turning operation, due to the throwing and displacement of the materials, the continuous conveying operation of the materials from the feeding end to the discharging end of the integrated fermentation equipment is naturally finished.
Preferably, as core equipment, the daily operation time of the turning and throwing equipment is less than 4h, the operation efficiency is improved, the equipment failure rate is reduced, and the service life of the equipment is prolonged
In another aspect, the invention further provides a sludge compost odor control system, which is used for implementing the sludge compost odor control method, and the system comprises:
the temperature real-time online monitoring system is used for monitoring the temperature of the stack in real time;
the blower is used for adjusting the aerobic state and the temperature of the pile body;
the intelligent monitoring system is used for receiving the stack temperature signal and controlling the operation of the blower according to the stack temperature signal;
the odor monitoring system is used for monitoring the odor concentration in the intelligent aerobic fermentation equipment;
a deodorizing system for decomposing odor;
the central control system is used for receiving the odor concentration signal and controlling the operation of the deodorization system according to the odor concentration signal;
the temperature real-time online monitoring system, the blower and the intelligent monitoring system are electrically connected; the odor monitoring system, the deodorization system and the central control system are electrically connected.
Optionally, the real-time online temperature monitoring system is a kirschner brand non-contact temperature monitoring device, and the measurement range is as follows: 0-100 ℃; and (3) measuring precision: 0.1 ℃; basic error: < 0.5%; response time: < 1S; resolution ratio: 1 percent; working voltage: DC 24V; the communication mode is as follows: WIFI 2.4G; protection grade: IP 65; the temperature measurement mode is as follows: and (3) carrying out non-contact infrared thermopile induction temperature measurement.
The temperature real-time online monitoring system is arranged in the fermentation bin, and the temperature real-time online monitoring system is arranged above the sludge pile at intervals of about 3 meters.
Optionally, the blower is located below the stack body, and oxygen is supplemented into the stack body through a positive pressure blast aeration mode.
Optionally, the intelligent monitoring system sets a temperature online monitoring instrument for the fermentation section of the integrated fermentation equipment, monitors the temperature of the material pile in different stages in real time, and automatically feeds back and controls the start and stop of the aeration fan.
Optionally, the odor monitoring system is a korkongkang brand online hydrogen sulfide and ammonia gas detector. The online automatic monitoring of the concentration of the odor components in the region can be realized, and the real-time change condition of the odor components in the environment can be continuously and automatically detected all day long.
Optionally, the deodorization system is an odor treatment device arranged at the tail end of the integrated fermentation device, and the single set of integrated odor treatment capacity is designed to be 2.5 ten thousand meters3And the ventilation frequency is 6 times per hour, the odor collected uniformly by the draught fan and the collection pipeline is sent into odor treatment equipment, the odor is treated by utilizing the biodegradation principle, so that the odor components are decomposed and converted into low odor components with higher odor threshold values to achieve the aim of deodorization, and the treated odor components are discharged in a organized manner after reaching the standard.
Optionally, the central control system includes a video monitoring system and an automatic control system. The video monitoring system comprises a liquid crystal display, large-screen comprehensive control software, an image splicing processor, a camera, a digital video recorder, a display and an optical cable; the automatic control system comprises fermentation process control software, upper computer monitoring software, a remote expert service system, a comprehensive cabinet, a control console, an upper monitoring industrial computer, a display, a printer, an Ethernet switch, a UPS and network communication elements. The above components, i.e. devices, are connected in the existing manner, and the present invention is not limited thereto.
Further preferably, the sludge compost odor control system of the present invention further comprises:
the odor collecting system is used for collecting odor emitted by the pile body;
and the turning equipment is used for turning and pushing the stack body to increase the oxygen content in the stack body materials.
Preferably, the odor collecting system comprises a horn-shaped air suction hood and an electric air valve; wherein, the electric air valve is arranged at the rear end of the air suction cover.
Wherein, the turning device is a turning machine mature in the field.
For specific description, beneficial effects and relevant examples of the device according to the embodiment of the present invention, reference is made to the above method, and details are not repeated herein.
In a specific embodiment, by the sludge compost odor control method and the system thereof, the technical parameters of the sludge compost body are controlled as follows:
| mixture C/N | (20-30)：1 |
| Water content of mixed material | ＜62％ |
| Organic matter content of mixture | ≥30％ |
| Temperature of fermentation | 55-65 deg.C, and lasting for no less than 6 days |
| Oxygen concentration of the stack | ≥5％ |
| Days of fermentation | 18 days (the most unfavorable working condition) |
| Water content of fermentation product | ＜45％ |
Wherein the mixture is the auxiliary material, the return material and the sludge raw material needing composting.
In a specific embodiment, the sludge compost odor control system is an integrated fermentation device, which adopts a horizontal box type, is integrally sealed, and is provided with a sealing door at a feeding end and a discharging end, so that the following functions are realized: the integration of functions such as material receiving, material distribution, oxygen supply, conveying, turning, monitoring, odor collection, odor treatment, intelligent control and the like. The related information is specifically as follows:
material receiving and distributing: the integrated fermentation equipment is provided with a material distribution conveyor in a feeding area and is used for receiving mixed materials with the water content of less than 62% sent by a material mixing system and automatically conveying the materials to a fermentation section of the integrated fermentation equipment, and the materials are distributed uniformly.
Material fermentation and oxygen supply: the fermentation section of the integrated fermentation equipment is designed in a partition mode, positive pressure blast aeration is adopted after materials enter the fermentation section, and full aerobic fermentation of the materials is achieved through a pipeline, an aeration fan and the like.
Material conveying and turning: the fermentation section of the integrated fermentation equipment is provided with an automatic turning and throwing device, materials are horizontally moved according to the fermentation period and the material quantity, the materials are mixed, loosened and turned and thrown in the conveying process, the materials are automatically conveyed to a discharging device through the turning and throwing device after being thoroughly decomposed, and the materials are conveyed to a finished product workshop through the discharging device to be transported outside; when a plurality of integrated fermentation devices are designed in parallel, the moving device is used for switching the turning device among the plurality of integrated fermentation devices.
Automatic monitoring: the fermentation section of the integrated fermentation equipment is provided with an online temperature monitoring instrument which monitors the temperature of the material pile in different stages in real time and automatically feeds back and controls the start and stop of the aeration fan.
Collecting odor: the integrated fermentation equipment adopts a fully sealed structure, and an odor collecting pipeline, an air port and the like are arranged in the equipment, so that odor is collected in an organized manner, the odor is prevented from overflowing, and the environmental quality of a plant area is ensured.
Odor treatment: the tail end of the integrated fermentation equipment is provided with an odor treatment equipment, and the single set of integrated odor treatment capacity is designed to be 2.5 ten thousand meters3And the ventilation frequency is 6 times per hour, the odor collected uniformly by the draught fan and the collection pipeline is sent into odor treatment equipment, the odor is treated by utilizing the biodegradation principle, so that the odor components are decomposed and converted into low odor components with higher odor threshold values to achieve the aim of deodorization, and the treated odor components are discharged in a organized manner after reaching the standard.
Intelligent control: the automatic weighing and mixing, the material distribution of the material distribution conveyor, the turning and throwing of the turning and throwing device, the discharging of the discharging device, the oxygen supply of the aeration fan, the temperature monitoring and feedback control and the odor collection and treatment automatically run through the intelligent control system, so that the running manpower is saved to the maximum extent; and the remote transmission of material fermentation operation parameters to an expert database cloud service platform is realized through a network system, a perfect project information cloud database is established, the operation state of a project process is remotely collected and analyzed, and differential fermentation control parameters are formulated according to different raw materials and different seasons, so that the process is optimized in real time, the production efficiency is improved, and the project management level is improved.
Different from the traditional fermentation process, in the integrated intelligent aerobic fermentation process, the operating frequency and time of the blower can be adjusted in real time according to the temperature change of the pile body through the temperature real-time online monitoring system and the intelligent control system, and the aerobic state of the pile body and the harmless temperature requirement of harmful substances are fully ensured. Because the process adopts the optimal oxygen supply mode, the phenomenon that a large amount of malodorous gas is released due to the anaerobic reaction of the pile body is avoided, and the emission of the odor is reduced from the source.
In order to protect the health of workers, the invention arranges a perfect odor monitoring device in the aerobic fermentation equipment to realize H2S、NH3And (3) monitoring the concentration in real time on line, transmitting signals to the central control system in real time, and controlling the opening and closing of the deodorization system. When the concentration of harmful gas in the fermentation equipment exceeds the standard, the monitoring device can send out an alarm signal, so that the health of staff is prevented from being harmed and safety accidents are avoided.
For the waste gas treatment of the aerobic fermentation of the sludge, the invention also comprises a combined odor treatment system of a prewashing-biological filter chamber deodorization device because the waste gas has complex components, relatively high concentration, is generally acidic and is unstable to generate instant fluctuation and load impact. The induced air mouth is evenly arranged in the intelligent aerobic fermentation equipment of integration foul smell production district, in unified the collecting of foul smell in with fermentation equipment through the pipeline carry to terminal foul smell treatment facility, handles to organize after up to standard and discharges.
Practice proves that the physical and chemical indexes of the fermentation product meet the requirements of land utilization indexes of agricultural sludge pollutant control standard (GB4284-2018) and sludge for sludge disposal and landscaping of municipal sludge treatment plants (GB/T23486-2009); the odor emission meets the first-level odor pollutant concentration limit value and the exhaust odor pollutant concentration limit value of the factory boundary of the odor pollutant emission standard (GB 14554-93).
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (10)
1. A sludge compost odor control method is characterized by comprising the following steps:
the temperature real-time online monitoring system monitors the temperature of the stack in real time, and the intelligent monitoring system adjusts the operation of a blower below the stack in real time according to the change of the temperature of the stack;
an odor monitoring system is arranged in the intelligent aerobic fermentation equipment, so that the odor concentration is monitored in real time, and a signal is transmitted to a central control system, thereby controlling the operation of the deodorization system.
2. The sludge compost odor control method as claimed in claim 1, further comprising:
and an odor collecting system is arranged above the stack body, and the running air volume of the odor collecting system and the turning equipment are subjected to linkage control.
3. The sludge composting odor control method of claim 1 wherein the odor monitoring system issues an alarm signal when the odor concentration is above a threshold.
4. A sludge compost odor control method as claimed in claim 2, wherein odor collected by said odor collection system is delivered to a prewash-biofilter deodorization apparatus.
5. A sludge compost odor control method as claimed in claim 1, wherein said heap is maintained at a high temperature of 55 ℃ to 65 ℃ for more than 6 days.
6. A sludge compost odor control method as claimed in claim 2, wherein said turning equipment is operated for < 4 hours per day.
7. The sludge compost odor control method as claimed in claim 2, wherein the deodorizing air volume is reduced by 30-40% by interlocking control of the odor collection system and the turning equipment.
8. A sludge compost odor control system, characterized by comprising:
the temperature real-time online monitoring system is used for monitoring the temperature of the stack in real time;
the blower is used for adjusting the aerobic state and the temperature of the pile body;
the intelligent monitoring system is used for receiving the stack temperature signal and controlling the operation of the blower according to the stack temperature signal;
the odor monitoring system is used for monitoring the odor concentration in the intelligent aerobic fermentation equipment;
a deodorizing system for decomposing odor;
the central control system is used for receiving the odor concentration signal and controlling the operation of the deodorization system according to the odor concentration signal;
the temperature real-time online monitoring system, the blower and the intelligent monitoring system are electrically connected; the odor monitoring system, the deodorization system and the central control system are electrically connected.
9. The sludge composting odor control system of claim 8 further comprising:
the odor collecting system is used for collecting odor emitted by the pile body;
and the turning equipment is used for turning and pushing the stack body to increase the oxygen content in the stack body materials.
10. The sludge composting odor control system of claim 9 wherein the odor collection system comprises a trumpet shaped suction hood and an electrically operated air valve; wherein, the electric air valve is arranged at the rear end of the air suction cover.
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