CN110668565A - Reelpipe type sludge sampling and activity evaluation device for anaerobic reactor and working method thereof - Google Patents
Reelpipe type sludge sampling and activity evaluation device for anaerobic reactor and working method thereof Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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Abstract
The invention relates to a reelpipe type sludge sampling and activity evaluation device for an anaerobic reactor and a working method thereof, wherein the reelpipe type sludge sampling and activity evaluation device comprises a reelpipe sampling system, a sludge testing system and a PLC (programmable logic controller) control system; the pipe coiling and sampling system comprises an anaerobic reactor, a stainless steel hose, a support frame and a positive and negative constant speed pipe coiling device-metering pump, and the sludge testing system comprises a densimeter, a pH/T tester, a storage reaction tank with a stirrer, a pressure gauge, a methane/carbon dioxide concentration tester, a methane emptying pipe with a control valve, a metering pump and a detection liquid storage tank; the PLC control system comprises a PLC central controller. The whole sampling period of the invention comprises two times of full-height sampling of the anaerobic reactor from bottom to top and from top to bottom, thus ensuring the representativeness, the comprehensiveness and the data accuracy of the sampled sludge.
Description
The technical field is as follows:
the invention relates to a reelpipe type sludge sampling and activity evaluation device for an anaerobic reactor and a working method thereof, belonging to the field of special equipment for anaerobic treatment of high-concentration sewage in environmental protection engineering.
Background art:
the anaerobic reactor has the characteristics of small occupied area, high treatment load, low operation cost and energy recovery; has occupied a position which is important and central in the aspect of high-concentration wastewater treatment. Under the guidance of national policies of energy conservation and emission reduction, the design and construction of the anaerobic reactor show a gradually rising trend. At present, the most common anaerobic reactors for high-concentration wastewater in China mainly comprise UASB (upflow anaerobic sludge blanket), EGSB (expanded granular sludge blanket), IC (integrated Circuit) reactors and the like, and the property and activity of anaerobic sludge filled in the reactors directly determine the operation quality of the anaerobic reactors. Therefore, the representative sampling of the sludge in time and the sludge activity detection in time are the most critical links in ensuring the daily maintenance and operation process of the anaerobic reactor.
At present, anaerobic sludge in an anaerobic reactor is sampled and activity test is carried out, the anaerobic sludge is generally tested by a sampling point arranged at a fixed position of the reactor, and then properties such as water/solid content, pH/T, ORP, MLSS, sludge activity and the like of the sample are tested in a laboratory.
Chinese patent document CN103969154A discloses a method and a device for rapidly determining the activity of anaerobic sludge for producing biogas, namely, the activity of the anaerobic sludge is represented by the maximum specific gas production rate of the sludge, the method is characterized in that anaerobic sludge is added into a fermentation bottle and is uniformly mixed with a substrate in the fermentation bottle, the fermentation bottle is placed into a constant temperature water tank, the anaerobic sludge is fully contacted and reacted with the fermentation substrate at the temperature of 30-35 ℃ under the stirring condition, the volume of the produced biogas is recorded after the produced biogas is dried, a relation curve graph of the accumulated volume of the biogas and the time is drawn, and the maximum specific gas production rate is calculated. However, the method and the device can not control sampling at full height in real time, the sampling range is also limited, and the test deviation is large.
The invention content is as follows:
aiming at the defects of bad sampling environment, complex operation, potential safety hazard, limited sampling range, large testing deviation and the like existing in the sampling and testing of sludge in the actual operation process of the anaerobic reactor at present, the invention provides a reelpipe type sludge sampling and activity evaluation device for synchronously sampling and testing full-height sludge of the anaerobic reactor and a working method thereof. The method has the characteristics of high automatic control degree, comprehensive sludge sampling, simple and easy operation, high safety and accurate activity judgment.
The technical scheme of the invention is as follows:
a reelpipe type sludge sampling and activity evaluation device for an anaerobic reactor comprises a reelpipe sampling system, a sludge testing system and a PLC control system;
the pipe coiling sampling system comprises an anaerobic reactor, a stainless steel hose, a support frame and a positive and negative constant speed pipe coiling device-metering pump, wherein the support frame is connected with the side wall of the anaerobic reactor, and the stainless steel hose is connected with the positive and negative constant speed pipe coiling device-metering pump and can move up and down along the support frame;
the sludge testing system comprises a densimeter, a pH/T tester, a storage reaction tank with a stirrer, a pressure gauge, a methane/carbon dioxide concentration tester, a methane emptying pipe with a control valve, a metering pump and a detection liquid storage tank; the device comprises a positive and negative constant speed pipe coiling device, a stainless steel hose of a metering pump, a densimeter, a pH/T tester, a pressure gauge, a methane/carbon dioxide concentration tester and a biogas emptying pipe with a control valve, wherein the stainless steel hose of the positive and negative constant speed pipe coiling device is connected with a storage reaction tank with a stirrer;
the PLC control system comprises a PLC central controller, is connected with a positive and negative constant speed pipe coiling device-metering pump, a densimeter, a pH/T tester, a pressure gauge, a methane/carbon dioxide concentration tester, a methane emptying pipe with a control valve and a metering pump, and is used for receiving, displaying and processing transmitted signals and outputting testing and evaluation results of sludge.
According to the invention, preferably, the diameter of the stainless steel hose is 50mm, the pipeline moving speed of the stainless steel hose driven by the forward and reverse constant speed pipe winder-metering pump is 1m/s, the flow speed of the sludge sample liquid in the pipe is 10m/s, namely the unit flow of the sludge sample extracted along the way is 20L/s.
According to the invention, preferably, the sensitivity of the densimeter, the pH/T tester, the pressure gauge and the methane/carbon dioxide concentration tester is more than or equal to 2 per thousand, and the sampling frequency is more than or equal to 20 per second; further preferably, the pH/T tester has a function of switching between pH and ORP parameters. The pH/T tester can test pH value, temperature and oxidation-reduction potential.
According to the invention, the metering pump flow rate is preferably 20L/s; the detection liquid in the detection liquid storage tank is generally sewage which is being treated by the anaerobic reactor, and can also be methanol/glucose nutrient solution or other production wastewater.
According to the present invention, preferably, the anaerobic reactor is a UASB anaerobic reactor or an EGSB anaerobic reactor.
According to the invention, the positive and negative constant speed pipe coiling device-metering pump can realize the pipe coiling of the stainless steel hose and can simultaneously extract the sludge sample liquid. The device accessories used in the invention are all conventional instruments and can be assembled according to the requirements of the invention.
According to the invention, the working method of the coiled pipe type sludge evaluation device for the anaerobic reactor comprises the following steps:
opening a positive and negative constant speed pipe coiling device-metering pump to drive a stainless steel hose to move upwards along a support frame at the speed of 1m/s and synchronously pumping a mixture of the sludge and the sewage along the way to a storage reaction tank with a stirrer at the speed of 20L/s, wherein when the stainless steel hose leaves the liquid surface of the anaerobic reactor, the time of the pumping along the way in the ascending movement process is t0Second, the total amount of the mixture of sludge and sewage extracted during the upward movement is 20t0Lifting; then the forward and reverse constant speed pipe coiling device-metering pump continuously operates t1After the second, the mixture reaches the top end of the anaerobic reactor, at the moment, the PLC central controller switches the positive and negative constant speed pipe coiling device-metering pump to move downwards, and synchronously extracts the mixture of the on-way sludge and the sewage to a storage reaction tank with a stirrer at the speed of 20L/s for t2Stopping pumping when the second is reached; the total amount of the sludge-sewage mixture extracted during the downward movement was 20 (t)2-t1) Lifting; in the process that the positive and negative constant-speed pipe coiling device-metering pump drives the stainless steel hose to move upwards and downwards along the support frame at the speed of 1m/s, the densimeter, the pH/T tester, the pressure gauge and the methane/carbon dioxide concentration tester record density indexes, pH/T indexes and pressure indexes in the whole process and upload the density indexes, the pH/T indexes and the pressure indexes to the PLC central controller, and at the moment, the positive and negative constant-speed pipe coiling device-metering pump is closed and a sampling period is completed; the total time t (unit: second) of one sampling period is t0+t1+t2Total sludge sample volume (V) sampled for one cycleSample (I)In liters) is 20 (t)2+t0-t1)；
The sludge activity evaluation process comprises the steps of opening a biogas emptying pipe with a control valve and a metering pump, pumping detection liquid from a detection liquid storage tank to a storage reaction tank with a stirrer at the speed of 20L/s for the duration oft2+t0-t1The extraction amount is 20 (t)2+t0-t1) Lifting; closing the biogas emptying pipe with the control valve, opening the stirring function of the storage reaction tank with the stirrer and recording the stirring duration t3(unit: hour); the pressure gauge and the methane/carbon dioxide concentration tester record the pressure value and the methane/carbon dioxide concentration value in the whole stirring time, after the stirring is finished, a methane emptying pipe with a control valve is opened until the pressure gauge returns to zero, and then a storage reaction tank with a stirrer is emptied, and at the moment, the activity evaluation of the sludge is finished;
and (4) outputting a result:
in the sampling process of sludge, t0And t2-t1The average density (g/mL) tested by a densimeter and a pH/T tester in two time periods, and the average pH value and the average temperature T are the average density (g/mL), the operating pH (dimensionless amount) and the operating temperature (T, DEG C) of anaerobic sludge in the reactor; the sludge concentration (MLSS) in the anaerobic reactor can be obtained according to the average density (rho, g/L) of the anaerobic sludge:
sludge concentration, MLSS (g/L) ═ 1600 × (ρ -1)/0.6
The mass (in kg) of MLSS of sludge taken from the storage tank with stirrer can be calculated according to the following formula:
sample sludge MLSS (Mmlss, unit kg) 32 × (t2+ t0-t1 (rho-1)/0.6
In the process of evaluating the activity of the sludge, t is passed3During the time period, the methane/carbon dioxide concentration tester outputs the concentration (C) of methaneMethaneml/L) and concentration of carbon dioxide (C)Carbon dioxidemL/L) ratio is CH in the marsh gas4:CO2The volume ratio of (a);
pressure gauge pressure value P1(unit: KPa) and a normal atmospheric pressure of P0(101.325KPa), the volume of the storage reaction tank with stirrer is evacuated to be V0(unit: L), the sludge activity (specific sludge methanogenic activity) is obtained by the following formula:
according to the invention, when the stainless steel hose is not in operation, the vertical height from the bottom end of the anaerobic reactor is H0(H0Not less than 0.00m), the liquid level height of the anaerobic reactor which normally works is H1Absolute height of anaerobic reactor is H2In the whole sludge sampling and evaluation process, the following requirements exist between the time (unit: second) of each stage and the height (unit: meter) of the anaerobic reactor, which are recorded in the PLC control system:
t0＝(H1-H0)÷1m/s
t1＝(H2-H1)÷1m/s
t2＝(H2-H0)÷1m/s
the invention has the beneficial effects that:
1. the whole sampling period comprises two times of full-height sampling of the anaerobic reactor from bottom to top and from top to bottom, and the representativeness, the comprehensiveness and the data accuracy of the sampled sludge are ensured.
2. After sampling, the sludge is directly subjected to activity test, the whole process adopts PLC automatic control and timely and synchronously outputs results, and the defect of long duration time of the laboratory test process is avoided.
Description of the drawings:
FIG. 1 is a schematic diagram of the main structure of a coiled pipe type sludge sampling and activity evaluation device for an anaerobic reactor.
Wherein: 1. anaerobic reactor, 2, stainless steel hose, 3, support frame, 4, positive and negative constant speed pipe rolling device-metering pump, 5, densimeter, 6, pH/T tester, 7, storage reaction tank with stirrer, 8, pressure gauge, 9, methane/carbon dioxide concentration tester, 10, biogas emptying pipe with control valve, 11, metering pump, 12, detection liquid storage tank, 13, PLC central controller, 14, anaerobic reactor liquid level, 15, anaerobic reactor top.
The specific implementation mode is as follows:
the present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, a coiled pipe type sludge sampling and activity evaluation device for an anaerobic reactor comprises a coiled pipe sampling system, a sludge testing system and a PLC control system;
the pipe coiling and sampling system comprises an anaerobic reactor 1, a stainless steel hose 2, a support frame 3 and a positive and negative constant speed pipe coiling device-metering pump 4, wherein the support frame 3 is connected with the side wall of the anaerobic reactor 1, and the stainless steel hose 2 is connected with the positive and negative constant speed pipe coiling device-metering pump 4 and can move up and down along the support frame 3;
the sludge testing system comprises a densimeter 5, a pH/T tester 6, a storage reaction tank 7 with a stirrer, a pressure gauge 8, a methane/carbon dioxide concentration tester 9, a methane emptying pipe 10 with a control valve, a metering pump 11 and a detection liquid storage tank 12; the stainless steel hose 2 passing through the positive and negative constant speed pipe coiling device-metering pump 4 is connected with a storage reaction tank 7 with a stirrer, a densimeter 5 and a pH/T tester 6 are arranged on the stainless steel hose 2 between the storage reaction tank 7 with the stirrer and the positive and negative constant speed pipe coiling device-metering pump 4, a pressure gauge 8, a methane/carbon dioxide concentration tester 9 and a methane emptying pipe 10 with a control valve are arranged on the storage reaction tank 7 with the stirrer, and the storage reaction tank 7 with the stirrer is connected with a detection liquid storage tank 12 through a metering pump 11;
the PLC control system comprises a PLC central controller 13 which is connected with a positive and negative constant speed pipe coiling device-metering pump 4, a densimeter 5, a pH/T tester 6, a pressure gauge 8, a methane/carbon dioxide concentration tester 9, a methane emptying pipe 10 with a control valve and a metering pump 11 and is used for receiving, displaying and processing transmitted signals and outputting testing and evaluation results of sludge.
In this embodiment, a steel-structured UASB anaerobic reactor designed and normally operated by an antibiotic pharmaceutical enterprise according to the sewage-related index in accordance with the national environmental protection standard HJ-2013 and 2012 "technical specification of upflow anaerobic sludge bed reactor sewage treatment engineering/technical specification of anaerobic sludge bed reactor (UASB) reactorforwa sanitary treatment"; the height of the water surface is 10.5m and the height of the reactor is 11m in the normal operation process of the UASB reactor, when the stainless steel hose is not in work, the vertical height from the bottom end of the anaerobic reactor is 0.5m, and the volume of a storage reaction tank (7) of the emptying stirrer is 1000L.
And in the sludge sampling process, the forward and reverse constant-speed pipe winder-metering pump 4 is started to drive the stainless steel hose 2 to move upwards along the support frame 3 at the speed of 1m/s and synchronously pump the mixture of the sludge and the sewage along the way to the storage reaction tank 7 with a stirrer at the speed of 20L/s, when the stainless steel hose 2 leaves the liquid level 14 of the anaerobic reactor, the on-way pumping time in the ascending movement process is 10 seconds, and the total amount of the mixture of the sludge and the sewage pumped in the upward movement process is 200 liters. Then, the forward and reverse adjustable pipe coiling device-metering pump 4 continuously runs for 0.5 second and then reaches the top end 15 of the anaerobic reactor, at the moment, the PLC central controller 13 switches the forward and reverse constant speed pipe coiling device-metering pump 4 to move downwards, and synchronously pumps the mixture of the sludge and the sewage along the way to the storage reaction tank 7 with a stirrer at the speed of 20L/s, and stops pumping when the pumping time is 10.5 seconds; the total amount of the mixture of the sludge and the sewage extracted in the downward moving process is 200 liters, and in the processes that the forward and reverse constant speed pipe coiling device-metering pump 4 drives the stainless steel hose 2 to move upwards and downwards along the support frame 3 at the speed of 1m/s, the density meter 5, the pH/T tester 6, the pressure gauge 8 and the methane/carbon dioxide concentration tester 9 record the density index, the pH/T index, the pressure index and the concentration in the whole process and upload the density index, the pH/T index, the pressure index and the concentration to the PLC central controller 13; at this time, the forward and reverse constant speed pipe coiling device-metering pump 4 is closed and a sampling period is completed. The total time t (unit: second) for one sampling period was 21 seconds, and the total sludge sample volume (Vsample, unit liter) for one sampling period was 400L.
Opening a biogas emptying pipe 10 with a control valve and a metering pump 11 to extract starch sewage with COD concentration of 20000mg/L from a detection liquid storage tank 12 to a storage reaction tank 7 with a stirrer at the speed of 20L/s, wherein the duration is 20 seconds, and the extraction amount is 400 liters; and after the stirring is finished, opening a methane emptying pipe 10 with a control valve until a pressure gauge 8 returns to zero, emptying a storage reaction tank 7 of the stirrer, and finishing the activity evaluation of the sludge at the moment.
The results of the related sludge properties and activity tests obtained in example 1 are as follows:
(1) in the sludge sampling process, the average density of the anaerobic sludge in the anaerobic reactor 1 is 1.018g/mL, the average pH value is 7.2 and the average temperature is 32 ℃ when the density of the densimeter 5 and the pH/T tester 6 in two time periods of 10-second upward sampling and 10-second downward sampling is 1.018g/mL, the operating pH value is 7.2 and the operating temperature is 32 ℃; the sludge concentration (MLSS) in the anaerobic reactor 1 was determined to be 48g/L from the average density of the anaerobic sludge.
The mass of the sludge MLSS taken from the storage tank 7 with stirrer was 19.2 kg.
(2) In the sludge activity evaluation process, after 8 hours of stirring reaction, the concentration of methane output by the methane/carbon dioxide concentration tester 9 is 635.255ml/L, and the ratio of the concentration of carbon dioxide to be 324.228ml/L is CH in the biogas4:CO2In a volume ratio of 1.96: 1.
The pressure value of the pressure gauge 8 is 184.625KPa, and the normal atmospheric pressure is P0(101.325Kpa), the specific methanogenic activity of sludge is 1488 ml/kg.h.
Example 2
As described in example 2, a certain paper-making company, based on the related index of wastewater, designed according to the national environmental protection Standard HJ-2013 + 2012 technical Specification for wastewater treatment engineering of upflow anaerobic sludge bed reactor/technical specifications of anaerobic sludge bed reactor for wastewater treatment/UASB
The difference is that:
the UASB anaerobic reactor is of a reinforced concrete structure, the height of the water surface is 6.5m and the height of the reactor is 7m in the normal operation process of the UASB anaerobic reactor, the vertical height from the bottom end of the anaerobic reactor is 0m when a stainless steel hose is not in operation, and the volume of a storage reaction tank 7 for emptying the stirrer is 650L.
The results of the related sludge properties and activity tests obtained in example 2 are as follows:
(1) in the sludge sampling process, the average density of the densimeter 5 and the pH/T tester 6 in two time periods of 6.5 second upward sampling and 6.5 second downward sampling is 1.016g/mL, the average pH value is 7.5 and the average temperature is 34 ℃, then the average density of anaerobic sludge in the reactor is 1.016g/mL, the operating pH value is 7.5 and the operating temperature is 34 ℃; the sludge concentration in the reactor (MLSS) was 42.6g/L from the average density of anaerobic sludge.
The mass of the sludge MLSS obtained from the storage tank 7 with stirrer was 11.09 kg.
(2) In the sludge activity evaluation process, after 12 hours of stirring reaction, the concentration of methane output by the methane/carbon dioxide concentration tester 9 is 588.255ml/L, and the ratio of the concentration of carbon dioxide to be 424.228ml/L is CH in the methane4:CO2Is 1.38: 1.
The pressure value of the pressure gauge 8 is 176.254KPa, and the normal atmospheric pressure is P0(101.325KPa), the specific methanogenic activity of the sludge is 1012 ml/kg.h.
Example 3
As described in example 1, a certain beer enterprise, according to the related index of sewage, is provided with a steel structure EGSB anaerobic reactor designed according to the technical Specification of anaerobic granular sludge expanded bed reactor wastewater treatment engineering of 2012, HJ-2023 + environmental protection Standard of the people's republic of China; the height of the water surface is 20.5m and the height of the reactor is 21m in the normal operation process of the EGSB reactor, when the stainless steel hose is not in work, the vertical height from the bottom end of the anaerobic reactor is 0.5m, the volume of the storage reaction tank 7 of the emptying stirrer is 2000L, and the volume of the storage reaction tank 7 of the emptying stirrer is 2000L.
And in the sludge sampling process, the positive and negative constant speed pipe coiling device-metering pump 4 is started to drive the stainless steel hose 2 to move upwards along the support frame 3 at the speed of 1m/s and synchronously pump the mixture of the sludge and the sewage along the way to the storage reaction tank 7 with a stirrer at the speed of 20L/s, when the stainless steel hose 2 leaves the liquid level 14 of the anaerobic reactor, the pumping time along the way in the ascending movement process is 20 seconds, and the total amount of the mixture of the sludge and the sewage pumped in the ascending movement process is 400 liters. And then the forward and reverse adjustable pipe coiling device-metering pump 4 continuously operates for 0.5 second and then reaches the top end 15 of the anaerobic reactor, at the moment, the PLC central controller 13 switches the forward and reverse constant speed pipe coiling device-metering pump 4 to move downwards, synchronously pumps the mixture of the sludge and the sewage along the way to the storage reaction tank 7 with a stirrer at the speed of 20L/s, stops pumping when the pumping time is 20.5 seconds, and the total amount of the mixture of the sludge and the sewage pumped in the downward moving process is 400 liters. In the process that the positive and negative constant-speed pipe coiling device-metering pump 4 drives the stainless steel hose 2 to move upwards and downwards along the support frame 3 at the speed of 1m/s, the densimeter 5, the pH/T tester 6, the pressure gauge 8 and the methane/carbon dioxide concentration tester 9 record the density index and the pH/T index in the whole process and upload the density index and the pH/T index to the PLC central controller 13, at the moment, the positive and negative constant-speed pipe coiling device-metering pump 4 is closed and a sampling period is completed, the total time T (unit: second) of one sampling period is 41 seconds, and the total sludge sample volume (V sample, unit liter) sampled in one period is 800L.
The sludge activity evaluation process comprises the steps of opening a biogas emptying pipe 10 with a control valve, pumping starch sewage with a COD concentration of 15000mg/L to a storage reaction tank 7 with a stirrer at a speed of 20L/s by a metering pump 11, wherein the duration time is 40 seconds, the pumping amount is 800 liters, closing the biogas emptying pipe 10 with the control valve, opening the stirring function of the storage reaction tank 7 with the stirrer, recording the stirring duration time for 8 hours (unit: lab), recording a pressure meter 8, recording a pressure value and a methane/carbon dioxide concentration value in the whole stirring time by a methane/carbon dioxide concentration tester 9, opening the biogas emptying pipe 10 with the control valve after stirring is finished, returning the pressure meter 8 to zero, and then emptying the storage reaction tank 7 of the stirrer, wherein the sludge activity evaluation is finished.
The results of the related sludge properties and activity tests obtained in example 3 are as follows:
(1) in the sampling process of the sludge, the average density tested by a densimeter 5 and a pH/T tester 6 in two time periods of 20-second upward sampling and 20-second downward sampling is 1.019g/mL, the average pH value is 7.6 and the average temperature is 33.5 ℃, then the average density of anaerobic sludge in the reactor is 1.019g/mL, the operating pH value is 7.6 and the operating temperature is 33.5 ℃; the sludge concentration in the reactor (MLSS) was determined from the average density of anaerobic sludge and was 50.66 g/L.
The mass of the sludge MLSS taken from the storage tank 7 with stirrer was 40.5 kg.
(2) In the sludge activity evaluation process, after 8 hours of stirring reaction, the concentration of methane output by the methane/carbon dioxide concentration tester 9 is 655.655ml/L, and the ratio of the concentration of carbon dioxide to be 334.88ml/L is CH in the biogas4:CO2Is 1.957.
The pressure value of the pressure gauge 8 is 181..611KPa, and the normal atmospheric pressure is P0(101.325KPa), the specific methanogenic activity of the sludge is 1348 ml/kg.h.
Example 4:
as described in example 3, a petrochemical enterprise, according to the related index of sewage, is provided with a steel structure EGSB anaerobic reactor designed according to the technical Specification for wastewater treatment engineering of anaerobic granular sludge expanded bed reactor 2012 "of the environmental protection standard HJ-2023-;
the difference is that:
the height of the water surface is 13m and the height of the reactor is 14m in the normal operation process of the EGSB reactor, when the stainless steel hose is not in work, the vertical height from the bottom end of the anaerobic reactor is 0m, the volume of the storage reaction tank 7 of the emptying stirrer is 2000L, and the volume of the storage reaction tank 7 of the emptying stirrer is 1300L.
The results of the related sludge properties and activity tests obtained in example 4 are as follows:
(1) in the sludge sampling process, the average density of the anaerobic sludge in the reactor is 1.015g/mL, the operating pH is 7.6 and the operating temperature is 32 ℃ when the average density of the densimeter 5 and the pH/T tester 6 in two time periods of 13-second upward sampling and 13-second downward sampling is 1.015g/mL, the average pH value is 7.6 and the average temperature is 32 ℃; the sludge concentration in the reactor (MLSS) was determined from the average density of anaerobic sludge and was 40.0 g/L.
The mass of the sludge MLSS taken from the storage tank 7 with stirrer was 20.80 kg.
(2) In the sludge activity evaluation process, after 12 hours of stirring reaction, the concentration of methane output by the methane/carbon dioxide concentration tester 9 is 538.652ml/L, and the ratio of the concentration of carbon dioxide to be 454.628ml/L is CH in the methane4:CO2The volume ratio of (a) to (b) is 1.18.
8 pressure gaugeThe force value is 170.254KPa, and the normal atmospheric pressure is P0(101.325KPa), the specific methanogenic activity of the sludge was 946.78 ml/kg.h.
Claims (8)
1. A reelpipe type sludge sampling and activity evaluation device for an anaerobic reactor is characterized by comprising a reelpipe sampling system, a sludge testing system and a PLC control system;
the pipe coiling sampling system comprises an anaerobic reactor, a stainless steel hose, a support frame and a positive and negative constant speed pipe coiling device-metering pump, wherein the support frame is connected with the side wall of the anaerobic reactor, and the stainless steel hose is connected with the positive and negative constant speed pipe coiling device-metering pump and can move up and down along the support frame;
the sludge testing system comprises a densimeter, a pH/T tester, a storage reaction tank with a stirrer, a pressure gauge, a methane/carbon dioxide concentration tester, a methane emptying pipe with a control valve, a metering pump and a detection liquid storage tank; the device comprises a positive and negative constant speed pipe coiling device, a stainless steel hose of a metering pump, a densimeter, a pH/T tester, a pressure gauge, a methane/carbon dioxide concentration tester and a biogas emptying pipe with a control valve, wherein the stainless steel hose of the positive and negative constant speed pipe coiling device is connected with a storage reaction tank with a stirrer;
the PLC control system comprises a PLC central controller, is connected with a positive and negative constant speed pipe coiling device-metering pump, a densimeter, a pH/T tester, a pressure gauge, a methane/carbon dioxide concentration tester, a methane emptying pipe with a control valve and a metering pump, and is used for receiving, displaying and processing transmitted signals and outputting testing and evaluation results of sludge.
2. The coiled pipe type sludge sampling and activity evaluation device for the anaerobic reactor as claimed in claim 1, wherein the stainless steel hose has a diameter of 50 mm.
3. The coiled pipe type sludge sampling and activity evaluation device for the anaerobic reactor as claimed in claim 1, wherein the pipe moving speed of the stainless steel flexible pipe driven by the forward and reverse constant speed coiled pipe device-metering pump is 1m/s, and the flow speed of the sludge sample liquid in the pipe is 10 m/s.
4. The reelpipe type sludge sampling and activity evaluation device for the anaerobic reactor as claimed in claim 1, wherein the sensitivity of the densimeter, the pH/T tester, the pressure gauge and the methane/carbon dioxide concentration tester is more than or equal to 2 per mill.
5. The coiled pipe type sludge sampling and activity evaluation device for the anaerobic reactor as claimed in claim 1, wherein the sampling frequency of the densitometer, the pH/T tester, the pressure gauge and the methane/carbon dioxide concentration tester is not less than 20 per second.
6. The coiled pipe type sludge sampling and activity evaluation device for the anaerobic reactor as claimed in claim 1, wherein the flow rate of the metering pump is 20L/s.
7. The coiled pipe type sludge sampling and activity evaluation device for the anaerobic reactor as claimed in claim 1, wherein the anaerobic reactor is a UASB anaerobic reactor or an EGSB anaerobic reactor.
8. The operating method of the coiled pipe type sludge evaluating apparatus for an anaerobic reactor according to claim 1, comprising the steps of:
opening a positive and negative constant speed pipe coiling device-metering pump to drive a stainless steel hose to move upwards along a support frame at the speed of 1m/s and synchronously pumping a mixture of the sludge and the sewage along the way to a storage reaction tank with a stirrer at the speed of 20L/s, wherein when the stainless steel hose leaves the liquid surface of the anaerobic reactor, the time of the pumping along the way in the ascending movement process is t0Second, the total amount of the mixture of sludge and sewage extracted during the upward movement is 20t0Lifting; subsequent forward and reverse constant speed pipe rolling device-metering pumpContinuing to operate t1After the second, the mixture reaches the top end of the anaerobic reactor, at the moment, the PLC central controller switches the positive and negative constant speed pipe coiling device-metering pump to move downwards, and synchronously extracts the mixture of the on-way sludge and the sewage to a storage reaction tank with a stirrer at the speed of 20L/s for t2Stopping pumping when the second is reached; the total amount of the sludge-sewage mixture extracted during the downward movement was 20 (t)2-t1) Lifting; in the process that the positive and negative constant-speed pipe coiling device-metering pump drives the stainless steel hose to move upwards and downwards along the support frame at the speed of 1m/s, the densimeter, the pH/T tester, the pressure gauge and the methane/carbon dioxide concentration tester record density indexes, pH/T indexes and pressure indexes in the whole process and upload the density indexes, the pH/T indexes and the pressure indexes to the PLC central controller, and at the moment, the positive and negative constant-speed pipe coiling device-metering pump is closed and a sampling period is completed; the total time t (unit: seconds) of one sampling period is: t is t0+t1+t2Total sludge sample volume (V) sampled in one cycleSample (I)In liters) is: 20 (t)2+t0-t1)；
The sludge activity evaluation process comprises the following steps: starting a biogas emptying pipe with a control valve and a metering pump, pumping the detection liquid from a detection liquid storage tank to a storage reaction tank with a stirrer at the speed of 20L/s for a duration of t2+t0-t1The extraction amount is 20 (t)2+t0-t1) Lifting; closing the biogas emptying pipe with the control valve, opening the stirring function of the storage reaction tank with the stirrer and recording the stirring duration t3(unit: hour); the pressure gauge and the methane/carbon dioxide concentration tester record the pressure value and the methane/carbon dioxide concentration value in the whole stirring time, after the stirring is finished, a methane emptying pipe with a control valve is opened until the pressure gauge returns to zero, and then a storage reaction tank with a stirrer is emptied, and at the moment, the activity evaluation of the sludge is finished;
and (4) outputting a result:
in the sampling process of sludge, t0And t2-t1The average density (g/mL) tested by a densimeter and a pH/T tester in two time periods, the average pH value and the average temperature T are the average density (g/mL) of anaerobic sludge in the reactor, and the operating pH (no pH)Dimension) and operating temperature (T, ° c); and (3) obtaining the sludge concentration (MLSS) in the anaerobic reactor according to the average density (rho, g/L) of the anaerobic sludge:
sludge concentration, MLSS (g/L) ═ 1600 × (ρ -1)/0.6
The mass (in kg) of MLSS sludge obtained from the storage reactor with stirrer was calculated according to the following formula:
sample sludge MLSS mass (Mmlss, unit kg) 32 × (t2+ t0-t1) (ρ -1)/0.6
In the process of evaluating the activity of the sludge, t is passed3During the time period, the methane/carbon dioxide concentration tester outputs the concentration (C) of methaneMethaneml/L) and concentration of carbon dioxide (C)Carbon dioxidemL/L) ratio is CH in the marsh gas4∶CO2The volume ratio of (a);
pressure gauge pressure value P1(unit: KPa) and a normal atmospheric pressure of P0(101.325KPa), the volume of the storage reaction tank with stirrer is evacuated to be V0(unit: L), the sludge activity (specific sludge methanogenic activity) is obtained by the following formula:
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