What to do if the moisture content of sludge exceeds the standard? How to detect the water content in sludge?

Overview
Sludge is a product separated from urban sewage treatment. The treatment method of urban sludge is generally the method of underground landfill. This method will inevitably occupy a large amount of urban land. In the sewage sludge of urban sewage treatment plant GJ3025-1993 The discharge standard clearly stipulates that the sludge in the urban sewage treatment plant after stable treatment in the plant should be dehydrated, and its moisture content should be less than 80%. However, to reduce the moisture content of the treated sludge, it is necessary to consume a larger amount of Flocculant and electrical energy, this will inevitably increase the operating cost of the sewage treatment plant. The sewage treatment plant must meet the sludge discharge standard without increasing the operating cost, and the measurement of the sludge moisture content is very important. In the past, the sludge moisture content The determination of is generally using the traditional weight method, that is, the moisture content of the sludge is calculated from the ratio of the weight of the sludge after drying and the original weight of the sludge.This method is simple but time-consuming, and it cannot really meet the requirements of the sewage treatment plant. Operational requirements. This method uses an infrared moisture quick tester to directly measure the moisture content of sludge, which is simple and time-saving, and has achieved satisfactory results.
Water content and solid content of sludge
The mass fraction of water content per unit mass of sludge is called water content, and the mass fraction of corresponding solid matter in sludge is called solid content (%). The water content of the sludge is generally very high, and the solids content is very low. For example, the solids content of the primary sludge in the urban sewage plant is 2% ~ 4%, and the solids content of the remaining activated sludge is 0.5% ~ 0.8%.
Moisture content of sludge: P = M / (M + S) · 100%
In the formula: P-moisture content of sludge,%
M—Water quality in sludge
S—Total solid mass in sludge.
Forms of water in sludge
Interstitial water: free water in the gap of particles, about 70%, can be separated by gravity precipitation (concentration and compaction);
Capillary water: the water around the highly dense fine sludge particles, formed by the capillary phenomenon, about 20%, can be separated by applying centrifugal force, negative pressure and other external forces, destroying the capillary surface tension and cohesion;
Water adsorption on the surface: Sludge is often in a colloidal state. For example, activated sludge belongs to a gel. The colloidal particles of sludge are very small and the specific surface area is large. Therefore, the surface tension action absorbs more water.
Internal / bound water: A part of the sludge water is enclosed in the cell membrane of the microorganism, forming internal bound water.
The surface adsorbed water and bound water account for about 10% of the moisture in the sludge, various types of capillary bound water account for about 20% of the total moisture in the sludge, and the interstitial water accounts for about 70% of the total moisture in the sludge.
The water content in the sludge is closely related to the sludge drying, treatment process, sludge status and flow performance. Generally, concentration can reduce the water content to 85% (aqueous state). When the water content is 70 to 75%, the sludge is in a soft state and is not easy to flow; usually, the dehydration can only be reduced to 60 to 65%, and it almost becomes solid When the moisture content is as low as 35% ~ 40%, it is in a state of aggregation (the above is a semi-dry state); further as low as 10% ~ 15% is in the form of powder.
Therefore, in the sludge production process, moisture detection is essential, and choosing a suitable sludge moisture instrument is also crucial. Although the traditional drying weight method is accurate in testing, it has a long measurement time, time and cost, and low efficiency. Infrared fast moisture analyzer has the characteristics of fast, simple and accurate operation. The measurement results can be consistent with the national standard method and gradually replace The traditional weight method has been more and more widely used in the sludge industry.
working principle
The sludge moisture content tester is also called infrared rapid moisture tester. It is designed using the principle of pyrolysis weight and is a new type of rapid moisture tester. While the moisture analyzer measures the weight of the sample, the infrared heating unit and the moisture evaporation channel quickly dry the sample.During the drying process, the moisture meter continuously measures and instantly displays the moisture content% of the sample lost.After the drying process is completed, the final moisture content is determined. The value is locked and displayed.
Compared with the international oven heating method, the test results have good consistency and replaceability, and the detection efficiency is much higher than the oven method. Generally, the sample can be measured in only a few minutes. The instrument is easy to operate and the test is accurate.The display part uses a red digital tube, and the display value is clearly visible.It can display moisture value, sample initial value, final value, measurement time, temperature initial value, final value and other data, and has a computer, Printer connection function.
name:
SFY-20 Infrared Rapid Moisture Analyzer, Sludge Moisture Analyzer
Technical index
1. Moisture determination range (%): 0.01-100
2. Moisture determination time: just a few minutes
3. Determination of sample weight (g): 0.5-90
4. Maximum weight (g): 90
5. Minimum weighing reading (g): 0.001
6. Moisture content readability (%): 0.01 / 0.001
7. Temperature indication range (℃): start -205 (adjustable)
8. Communication interface: standard RS232 interface
9. Overall dimensions (mm): 380 × 205 × 325
10. Net weight: 3.7kg
Method of operation
Ready to work
1. The instrument is placed on the laboratory work platform steadily, loosen the bottom protection weighing screw 2-3mm;
2. Open the heating system, install the weighing components, and put them into the tripod, bracket, and sample tray in sequence;
3. Turn on the power, turn on the power switch on the back of the instrument, and the instrument starts self-checking and zeroing;
4. The instrument real weight window display: 0.000. Put a 20g weight and display 20.000g. If the display is not 20.000, remove the weight, (zero), press (calibrate), the weight window displays -20-, put the weight, the instrument will automatically calibrate. After calibration, the instrument displays 20.000g and remove the weight.
Sample testing
1. Set temperature;
2. Sampling: If the samples are stacked together, remove the sample tray and spread it out. Do not spread the sample directly on the instrument by hand or sample spoon. If there is a large particle sample, please crush or take it out (the sample must be uniform);
3. Close the heating system (heating cylinder)
4. Weighing is stable, press (↑) key, and press (test) key immediately, the instrument heats up. (Do not put your hands on the heating cylinder during the test to avoid burns)
5. Press the (display) key after the measurement to record the data.
Instrument maintenance
1. Use environment: no dust, no wind, dry, no vibration, no magnetic field around;
2. Keep the instrument clean;
3. The weighing system must not be overloaded or pressed by gravity, so please pay attention;
4. If the infrared lamp and the heating lamp are dirty, wipe it regularly;
5. To close the cabin with the temperature setting on the right
Overview
Sludge is a product separated from urban sewage treatment. The treatment method of urban sludge is generally the method of underground landfill. This method will inevitably occupy a large amount of urban land. In the sewage sludge of urban sewage treatment plant GJ3025-1993 The discharge standard clearly stipulates that the sludge in the urban sewage treatment plant after stable treatment in the plant should be dehydrated, and its moisture content should be less than 80%. However, to reduce the moisture content of the treated sludge, it is necessary to consume a larger amount of Flocculant and electrical energy, this will inevitably increase the operating cost of the sewage treatment plant. The sewage treatment plant must meet the sludge discharge standard without increasing the operating cost, and the measurement of the sludge moisture content is very important. In the past, the sludge moisture content The determination of is generally using the traditional weight method, that is, the moisture content of the sludge is calculated from the ratio of the weight of the sludge after drying and the original weight of the sludge.This method is simple but time-consuming, and it cannot really meet the requirements of the sewage treatment plant. Operational requirements. This method uses an infrared moisture quick tester to directly measure the moisture content of sludge, which is simple and time-saving, and has achieved satisfactory results.
Water content and solid content of sludge
The mass fraction of water content per unit mass of sludge is called water content, and the mass fraction of corresponding solid matter in sludge is called solid content (%). The water content of the sludge is generally very high, and the solids content is very low. For example, the solids content of the primary sludge in the urban sewage plant is 2% ~ 4%, and the solids content of the remaining activated sludge is 0.5% ~ 0.8%.
Moisture content of sludge: P = M / (M + S) · 100%
In the formula: P-moisture content of sludge,%
M—Water quality in sludge
S—Total solid mass in sludge.
Forms of water in sludge
Interstitial water: free water in the gap of particles, about 70%, can be separated by gravity precipitation (concentration and compaction);
Capillary water: the water around the highly dense fine sludge particles, formed by the capillary phenomenon, about 20%, can be separated by applying centrifugal force, negative pressure and other external forces, destroying the capillary surface tension and cohesion;
Water adsorption on the surface: Sludge is often in a colloidal state. For example, activated sludge belongs to a gel. The colloidal particles of sludge are very small and the specific surface area is large. Therefore, the surface tension action absorbs more water.
Internal / bound water: A part of the sludge water is enclosed in the cell membrane of the microorganism, forming internal bound water.
The surface adsorbed water and bound water account for about 10% of the moisture in the sludge, various types of capillary bound water account for about 20% of the total moisture in the sludge, and the interstitial water accounts for about 70% of the total moisture in the sludge.
The water content in the sludge is closely related to the sludge drying, treatment process, sludge status and flow performance. Generally, concentration can reduce the water content to 85% (aqueous state). When the water content is 70 to 75%, the sludge is in a soft state and is not easy to flow; usually, the dehydration can only be reduced to 60 to 65%, and it almost becomes solid When the moisture content is as low as 35% ~ 40%, it is in a state of aggregation (the above is a semi-dry state); further as low as 10% ~ 15% is in the form of powder.
Therefore, in the sludge production process, moisture detection is essential, and choosing a suitable sludge moisture instrument is also crucial. Although the traditional drying weight method is accurate in testing, it has a long measurement time, time and cost, and low efficiency. Infrared fast moisture analyzer has the characteristics of fast, simple and accurate operation. The measurement results can be consistent with the national standard method and gradually replace The traditional weight method has been more and more widely used in the sludge industry.
working principle
The sludge moisture content tester is also called infrared rapid moisture tester. It is designed using the principle of pyrolysis weight and is a new type of rapid moisture tester. While the moisture analyzer measures the weight of the sample, the infrared heating unit and the moisture evaporation channel quickly dry the sample.During the drying process, the moisture meter continuously measures and instantly displays the moisture content% of the sample lost.After the drying process is completed, the final moisture content is determined. The value is locked and displayed.
Compared with the international oven heating method, the test results have good consistency and replaceability, and the detection efficiency is much higher than the oven method. Generally, the sample can be measured in only a few minutes. The instrument is easy to operate and the test is accurate.The display part uses a red digital tube, and the display value is clearly visible.It can display moisture value, sample initial value, final value, measurement time, temperature initial value, final value and other data, and has a computer, Printer connection function.
name:
SFY-20 Infrared Rapid Moisture Analyzer, Sludge Moisture Analyzer
Technical index
1. Moisture determination range (%): 0.01-100
2. Moisture determination time: just a few minutes
3. Determination of sample weight (g): 0.5-90
4. Maximum weight (g): 90
5. Minimum weighing reading (g): 0.001
6. Moisture content readability (%): 0.01 / 0.001
7. Temperature indication range (℃): start -205 (adjustable)
8. Communication interface: standard RS232 interface
9. Overall dimensions (mm): 380 × 205 × 325
10. Net weight: 3.7kg
Method of operation
Ready to work
1. The instrument is placed on the laboratory work platform steadily, loosen the bottom protection weighing screw 2-3mm;
2. Open the heating system, install the weighing components, and put them into the tripod, bracket, and sample tray in sequence;
3. Turn on the power, turn on the power switch on the back of the instrument, and the instrument starts self-checking and zeroing;
4. The instrument real weight window display: 0.000. Put a 20g weight and display 20.000g. If the display is not 20.000, remove the weight, (zero), press (calibrate), the weight window displays -20-, put the weight, the instrument will automatically calibrate. After calibration, the instrument displays 20.000g and remove the weight.
Sample testing
1. Set temperature;
2. Sampling: If the samples are stacked together, remove the sample tray and spread it out. Do not spread the sample directly on the instrument by hand or sample spoon. If there is a large particle sample, please crush or take it out (the sample must be uniform);
3. Close the heating system (heating cylinder)
4. Weighing is stable, press (↑) key, and press (test) key immediately, the instrument heats up. (Do not put your hands on the heating cylinder during the test to avoid burns)
5. Press the (display) key after the measurement to record the data.
Instrument maintenance
1. Use environment: no dust, no wind, dry, no vibration, no magnetic field around;
2. Keep the instrument clean;
3. The weighing system must not be overloaded or pressed by gravity, so please pay attention;
4. If the infrared lamp and the heating lamp are dirty, wipe it regularly;
5. To close the cabin with the temperature setting on the right
Overview
Sludge is a product separated from urban sewage treatment. The treatment method of urban sludge is generally the method of underground landfill. This method will inevitably occupy a large amount of urban land. In the sewage sludge of urban sewage treatment plant GJ3025-1993 The discharge standard clearly stipulates that the sludge in the urban sewage treatment plant after stable treatment in the plant should be dehydrated, and its moisture content should be less than 80%. However, to reduce the moisture content of the treated sludge, it is necessary to consume a larger amount of Flocculant and electrical energy, this will inevitably increase the operating cost of the sewage treatment plant. The sewage treatment plant must meet the sludge discharge standard without increasing the operating cost, and the measurement of the sludge moisture content is very important. In the past, the sludge moisture content The determination of is generally using the traditional weight method, that is, the moisture content of the sludge is calculated from the ratio of the weight of the sludge after drying and the original weight of the sludge.This method is simple but time-consuming, and it cannot really meet the requirements of the sewage treatment plant. Operational requirements. This method uses an infrared moisture quick tester to directly measure the moisture content of sludge, which is simple and time-saving, and has achieved satisfactory results.
Water content and solid content of sludge
The mass fraction of water content per unit mass of sludge is called water content, and the mass fraction of corresponding solid matter in sludge is called solid content (%). The water content of the sludge is generally very high, and the solids content is very low. For example, the solids content of the primary sludge in the urban sewage plant is 2% ~ 4%, and the solids content of the remaining activated sludge is 0.5% ~ 0.8%.
Moisture content of sludge: P = M / (M + S) · 100%
In the formula: P-moisture content of sludge,%
M—Water quality in sludge
S—Total solid mass in sludge.
Forms of water in sludge
Interstitial water: free water in the gap of particles, about 70%, can be separated by gravity precipitation (concentration and compaction);
Capillary water: the water around the highly dense fine sludge particles, formed by the capillary phenomenon, about 20%, can be separated by applying centrifugal force, negative pressure and other external forces, destroying the capillary surface tension and cohesion;
Water adsorption on the surface: Sludge is often in a colloidal state. For example, activated sludge belongs to a gel. The colloidal particles of sludge are very small and the specific surface area is large. Therefore, the surface tension action absorbs more water.
Internal / bound water: A part of the sludge water is enclosed in the cell membrane of the microorganism, forming internal bound water.
The surface adsorbed water and bound water account for about 10% of the moisture in the sludge, various types of capillary bound water account for about 20% of the total moisture in the sludge, and the interstitial water accounts for about 70% of the total moisture in the sludge.
The water content in the sludge is closely related to the sludge drying, treatment process, sludge status and flow performance. Generally, concentration can reduce the water content to 85% (aqueous state). When the water content is 70 to 75%, the sludge is in a soft state and is not easy to flow; usually the dehydration can only be reduced to 60 to 65%, at this time it becomes almost solid When the moisture content is as low as 35% ~ 40%, it is in a state of aggregation (the above is a semi-dry state); further as low as 10% ~ 15% is in the form of powder.
Therefore, in the sludge production process, moisture detection is essential, and choosing a suitable sludge moisture instrument is also crucial. Although the traditional drying weight method is accurate in testing, it has a long measurement time, time and cost, and low efficiency. Infrared fast moisture analyzer has the characteristics of fast, simple and accurate operation. The measurement results can be consistent with the national standard method and gradually replace The traditional weight method has been more and more widely used in the sludge industry.
working principle
The sludge moisture content tester is also called infrared rapid moisture tester. It is designed using the principle of pyrolysis weight and is a new type of rapid moisture tester. While the moisture analyzer measures the weight of the sample, the infrared heating unit and the moisture evaporation channel quickly dry the sample.During the drying process, the moisture meter continuously measures and instantly displays the moisture content% of the sample lost.After the drying process is completed, the final moisture content is determined The value is locked and displayed.
Compared with the international oven heating method, the test results have good consistency and replaceability, and the detection efficiency is much higher than the oven method. Generally, the sample can be measured in only a few minutes. The instrument is easy to operate and the test is accurate.The display part uses a red digital tube, and the display value is clearly visible.It can display moisture value, sample initial value, final value, measurement time, temperature initial value, final value and other data, and has a computer, Printer connection function.
name:
SFY-20 Infrared Rapid Moisture Analyzer, Sludge Moisture Analyzer
Technical index
1. Moisture determination range (%): 0.01-100
2. Moisture determination time: just a few minutes
3. Determination of sample weight (g): 0.5-90
4. Maximum weight (g): 90
5. Minimum weighing reading (g): 0.001
6. Moisture content readability (%): 0.01 / 0.001
7. Temperature indication range (℃): start -205 (adjustable)
8. Communication interface: standard RS232 interface
9. Overall dimensions (mm): 380 × 205 × 325
10. Net weight: 3.7kg
Method of operation
Ready to work
1. The instrument is placed on the laboratory work platform steadily, loosen the bottom protection weighing screw 2-3mm;
2. Open the heating system, install the weighing components, and put them into the tripod, bracket, and sample tray in sequence;
3. Turn on the power, turn on the power switch on the back of the instrument, and the instrument starts self-checking and zeroing;
4. The instrument real weight window display: 0.000. Put a 20g weight and display 20.000g. If the display is not 20.000, remove the weight, (zero), press (calibrate), the weight window displays -20-, put the weight, the instrument will automatically calibrate. After calibration, the instrument displays 20.000g and remove the weight.
Sample testing
1. Set temperature;
2. Sampling: If the samples are stacked together, remove the sample tray and spread it out. Do not spread the sample directly on the instrument by hand or sample spoon. If there is a large particle sample, please crush or take it out (the sample must be uniform);
3. Close the heating system (heating cylinder)
4. Weighing is stable, press (↑) key, and press (test) key immediately, the instrument heats up. (Do not put your hands on the heating cylinder during the test to avoid burns)
5. Press the (display) key after the measurement to record the data.
Instrument maintenance
1. Use environment: no dust, no wind, dry, no vibration, no magnetic field around;
2. Keep the instrument clean;
3. The weighing system must not be overloaded or pressed by gravity, so please pay attention;
4. If the infrared lamp and the heating lamp are dirty, wipe it regularly;
5. To close the cabin with the temperature setting on the right

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