CN110563308B - Blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement - Google Patents
Blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement Download PDFInfo
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- CN110563308B CN110563308B CN201910915586.7A CN201910915586A CN110563308B CN 110563308 B CN110563308 B CN 110563308B CN 201910915586 A CN201910915586 A CN 201910915586A CN 110563308 B CN110563308 B CN 110563308B
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
Abstract
The invention provides a blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement, which comprises the steps of pretreating blue algae mud, heating, adding multivalent cation salt, adjusting the pH value range to be 1.5-5, enabling the ratio of the storage modulus to the loss modulus of the blue algae mud to be less than 3.0, ensuring that capsular polysaccharide soft lattices in the blue algae mud are subjected to thermal rearrangement, pumping the treated blue algae mud into a preheated dehydration device, and performing hot-pressing dehydration at the preheating temperature range of 70-100 ℃. The method has the advantages of simple process, mild reaction and good dehydration effect, does not add conditioners such as calcium oxide, clay and the like, saves the cost, reduces the content of inorganic matters in the blue algae cake, relatively improves the content of organic matters and the calorific value in the filter cake, and does not increase the COD of the filtrate; the dehydrated and dried blue algae powder has high content of organic matters (volatile solids/total solids are more than 85 percent) and high heat value, is favorable for expanding the resource utilization way of blue algae and improving the quality of subsequent products.
Description
Technical Field
The invention belongs to the field of environmental engineering, and particularly relates to a blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement.
Background
The blue algae is an ecological product generated after the eutrophication of the water body of the freshwater lake. Since the outbreak of blue algae water crisis in the Taihu lake in 2007, the Wuxi city organizes scientific research strength to solve the problems of blue algae salvage and harmless treatment, and the Taihu lake has become an auxiliary injection center for the advanced blue algae treatment technology to be popularized all over the country. At present, the blue algae mud with the water content of about 90 percent is generally subjected to landfill treatment, the occupied area is large, land resources are occupied, and the blue algae mud still needs to be subjected to volume reduction treatment. Although the blue algae mud can be recycled by means of biological methane production, biological compost and the like, the blue algae mud contains substances such as algal toxins, biological resistance and the like, and cannot meet the market demand.
Because the dry matter of the cyanobacteria mud is rich in more than 90 percent of organic substances, most of the cyanobacteria mud is macromolecular substances, further deep dehydration is very difficult, and the cyanobacteria mud becomes a technical bottleneck for harmless and resource treatment after the cyanobacteria mud is salvaged ashore. The Chinese patent with the application number of 201810661585.X discloses a method for deep dehydration compatibility of blue algae mud, which comprises the steps of pretreating the blue algae mud by adopting complex enzyme, sodium tripolyphosphate, EDTA, citric acid and the like, adjusting the pH, adding other agents and then conditioning. Although the method can dehydrate the cyanobacteria mud to about 50 percent, the preliminary treatment is complicated, the medicament addition types are more, and the practical application is difficult. In addition, application No. 201910040109.0 discloses a method for deeply dehydrating blue algae, which utilizes Fenton reaction to oxidize and degrade organic matters into small molecules, thereby being beneficial to filter pressing and dehydration, but COD in filtrate can be obviously increased due to molecular degradation, and the difficulty in processing the filtrate is increased.
In view of the above, there is a need for improvement and simplification of the method for deep dehydration of cyanobacterial sludge in the prior art.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement, so that blue algae mud with the water content of below 70% is obtained, and the practical application value of blue algae dehydration is improved.
In order to achieve the purpose, the invention provides a specific technical scheme that:
a blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement specifically comprises the following steps:
s1: adding one or more multivalent cation salts into the blue algae mud in a stirring device, wherein the total using amount of the multivalent cation salts is 3.0-15% of the mass of dry substances in the blue algae mud, stirring for 10-60 min to uniformly mix the blue algae mud, and adjusting the pH value of the blue algae mud to be acidic; simultaneously stirring and heating the materials to 70-100 ℃; the hydrophobic groups of the polysaccharide are exposed by adding the multivalent cations, and the blue algae mud can be directly subjected to filter pressing without adding water to dilute the materials before filtering.
S2: preheating the dehydration device to keep the internal temperature of the dehydration device at 70-100 ℃ and standing by.
S3: and detecting whether the ratio of the storage modulus to the loss modulus of the cyanobacteria mud obtained in the S1 is less than 3.0, if the ratio is higher than 3.0, increasing the usage amount of the multivalent cation salt in the S1 until the ratio is less than 3.0, so as to ensure that the thermal rearrangement of the capsular polysaccharide soft lattice in the cyanobacteria mud occurs.
S4: keeping the temperature of S3 blue algae mud at 70-100 ℃, and performing thermal rearrangement on soft lattices of capsular polysaccharide to change the water solubility and rheological properties of the soft lattices and promote the deep filter pressing and dehydration of the blue algae mud to be implemented; and (4) conveying the cyanobacteria mud subjected to thermal rearrangement treatment to a preheated dehydration device.
S5: and adjusting the feeding pressure range of the dehydration device to be 0.5-2.5 MPa.
Further, the initial water content of the blue algae mud is between 85 and 95 percent.
Further, the pH value range in the S1 is 1.5-5.
Further, the multivalent cation salt comprises one or more of ferric sulfate, aluminum sulfate, ferric chloride, aluminum chloride, ferric citrate, aluminum citrate, ferrous acetate and ferrous sulfate.
Further, the dehydration device adopts a hot-press filtering device.
Furthermore, the hot-pressing filtering device is a diaphragm plate-and-frame filter press, an ultrahigh pressure filter press or a spring type filter press.
Further, the hot press filtration device comprises a filter plate and a filter cloth.
Furthermore, the filter plate and the filter cloth are made of temperature-resistant materials, and the temperature-resistant range is more than 120 ℃.
The beneficial effects brought by the invention are as follows:
1. the filter aid adopted by the invention is less in addition (less than 15 percent of the dry weight of the blue algae mud, wt), and a large amount of conditioners such as lime, clay and the like are not needed to be added, so that the cost is saved, the inorganic matter content in the blue algae cake is reduced, and the organic matter content and the heat value in the filter cake are relatively improved.
2. Compared with the common filter pressing process which needs to add a large amount of conditioner, the invention has higher volume reduction rate and more removed water volume under the conditions of similar filter pressing effect and same water content of the algae cakes.
3. Compared with the method for oxidizing and degrading organic matters into small molecules by using Fenton reaction, the method has the advantages that the filtrate is easy to treat, and the COD of the filtrate is not increased.
4. The drying energy consumption is low after deep dehydration, the resource utilization approaches are more, the dehydrated and dried organic matter content is high (volatile solid/total solid, VS/TS is more than 85 percent), the heat value is high, the utilization approach is favorably expanded, and the quality of subsequent resource products is improved.
Drawings
FIG. 1 is a schematic view of a press filtration dehydration process of cyanobacteria mud of the present invention.
Detailed Description
The technical solution of the present invention is described in detail and completely with reference to fig. 1, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments, and do not limit the claims of the present invention.
Example 1
Taking 1.0 ton of fresh blue algae mud with water content of 90% (w/v) and VS/TS of 91%, adding 10kg of ferric sulfate into a stirring device, wherein the input amount of the ferric sulfate is 10% (wt) of the dry matter weight of the blue algae. Heating the blue algae mud to 80 ℃ by using water vapor, adjusting the pH to 2.5, and stirring for 30min by using a stirrer. Sampling and detecting the storage modulus and the loss modulus under corresponding temperature conditions, confirming that the ratio of the storage modulus to the loss modulus is less than 3.0, if the ratio is more than 3.0, supplementing the addition amount of ferric sulfate, stirring and mixing to enable the storage modulus/the loss modulus to be less than 3.0.
Meanwhile, circulating hot water at 80 ℃ is pumped into the unloaded diaphragm type plate-and-frame filter press, filtered hot water flows back to a hot water tank, and the diaphragm type plate-and-frame filter press is preheated and stands by.
Pumping the blue algae slurry into a diaphragm plate-and-frame filter press for filter pressing after the stirring of the blue algae slurry is finished, keeping the pressure constant after the feeding pressure is increased to 1.2MPa, and discharging the hot filtrate to a collecting tank.
When the filtrate flow rate decreased to 2L/min, the feed valve was closed. And pumping hot water at 80 ℃ into the diaphragm cavity, and squeezing a filter cake in the diaphragm type plate-and-frame filter press at the squeezing pressure of 1.5 MPa.
And (4) measuring the filtered liquid volume and the water content of the obtained blue algae cake in the filter pressing process.
Measuring that 1.0 ton of blue algae mud can be dehydrated and separated to obtain about 688L of filtrate, and the volume reduction rate reaches 68.8 percent; the water content of the blue algae cake obtained by filter pressing is 68 percent, and the VS/TS of the blue algae cake is about 85 percent. The obtained blue algae cake has low calorific value of 1160 kcal/kg.
Example 2
0.65 ton of fresh blue algae mud with water content of 85% (w/v) and VS/TS of 91 percent is taken. 13kg of ferric chloride is added, namely the dosage of the ferric chloride is 13.3 percent (wt) of the weight of the dry matter of the blue algae. And (3) heating the blue algae mud to 85 ℃ by using steam, adjusting the pH to 2.0, and stirring for 25min by using a stirrer. Sampling and detecting the storage modulus and the loss modulus under corresponding temperature conditions, and confirming that the ratio of the storage modulus to the loss modulus is less than 3.0. If the pH value is higher than 3.0, adjusting the pH value to 1.0-1.5, and stirring and uniformly mixing to ensure that the storage modulus/loss modulus is less than 3.0.
At the same time, circulating hot water at 85 ℃ is pumped into the unloaded filter press, filtered hot water flows back to the hot water tank, and the filter press is preheated and stands by.
Pumping the blue algae slurry into a diaphragm plate-and-frame filter press for filter pressing after the stirring of the blue algae slurry is finished, keeping the pressure constant after the feeding pressure is increased to 1.25MPa, and discharging the hot filtrate to a collecting tank.
When the filtrate flow rate decreased to 1.0L/min, the feed valve was closed. Pumping hot water with the temperature of 85 ℃ into the diaphragm cavity, and squeezing a filter cake in the diaphragm type plate-and-frame filter press at the squeezing pressure of 1.5 MPa.
And (4) measuring the filtered liquid volume and the water content of the obtained blue algae cake in the filter pressing process.
Measuring that 0.65 ton of blue algae mud can be dehydrated and separated to obtain 364L of filtrate, and the volume reduction rate reaches 56 percent; the water content of the algae cake obtained by filter pressing is 65 percent, and the VS/TS of the algae cake is about 81 percent. The obtained blue algae cake has low calorific value of 1100 kcal/kg.
Example 3
1.6 tons of fresh blue algae mud with 94 percent of water content (w/v) and 91 percent of VS/TS are taken. 6kg of aluminum sulfate is added, namely the adding amount of the aluminum sulfate is 6.25 percent (wt) of the weight of the dry matter of the blue algae. And (3) heating the blue algae mud to 90 ℃ by using steam, adjusting the pH to 2.0, and stirring for 20min by using a stirrer. Sampling and detecting the storage modulus and the loss modulus under corresponding temperature conditions, and confirming that the ratio of the storage modulus to the loss modulus is less than 3.0. If the ratio is higher than 3.0, the addition amount of ferric sulfate is supplemented, and stirring and mixing are carried out, so that the storage modulus/loss modulus is less than 3.0.
Meanwhile, pumping 90 ℃ circulating hot water into the unloaded filter press, filtering out the hot water, refluxing the filtered hot water to a hot water tank, preheating the diaphragm plate-and-frame filter press and standing by.
Pumping the blue algae slurry into a diaphragm plate-and-frame filter press for filter pressing after the stirring of the blue algae slurry is finished, keeping the pressure constant after the feeding pressure is increased to 1.2MPa, and discharging the hot filtrate to a collecting tank.
When the filtrate flow rate decreased to 2L/min, the feed valve was closed. Pumping hot water of 90 ℃ into the diaphragm cavity, and squeezing a filter cake in the diaphragm type plate-and-frame filter press at the squeezing pressure of 1.5 MPa.
And (4) measuring the filtered liquid volume and the water content of the obtained blue algae cake in the filter pressing process.
Measuring that 1.6 tons of blue algae mud can be dehydrated and separated to obtain about 1288L of filtrate, and the volume reduction rate reaches 80 percent; the water content of the algae cake obtained by pressure filtration is 70 percent, and the VS/TS of the algae cake is about 87 percent. The obtained blue algae cake has low calorific value of 1200 kcal/kg.
Comparative example 1
1.0 ton of fresh blue algae mud with water content of 90% (w/v) and VS/TS of 91 percent is taken. 10kg of polyaluminium chloride is added, namely the dosage of the polyaluminium chloride is 10 percent (wt) of the weight of the dry matter of the blue algae. Pumping the blue algae slurry into a diaphragm plate-and-frame filter press for filter pressing under the normal temperature condition, keeping the pressure constant after the feeding pressure is increased to 1.25MPa, and discharging the hot filtrate to a collection tank.
When the filtrate flow rate decreased to 1.0L/min, the feed valve was closed. Pumping tap water into the diaphragm cavity, and squeezing a filter cake in the diaphragm type plate-and-frame filter press at a squeezing pressure of 1.5 MPa. And (5) measuring the volume of the filtrate and the water content of the obtained blue algae cake in the filter pressing process.
Measuring that 1.0 ton of blue algae mud can be dehydrated and separated to obtain about 232L of filtrate, and the residual feed liquid is 478L, and the actual volume reduction rate is 44%; the water content of the blue algae cake obtained by filter pressing is 82%, the blue algae cake is in a mud shape and cannot automatically fall off from the plate-and-frame machine, and the filter cake cleaning, the filter cloth cleaning and the next batch operation implementation of the plate-and-frame machine are influenced. After the obtained algae cake is dried, the VS/TS is about 82%. The low calorific value of the obtained blue algae cake is only 560kcal/kg, which affects subsequent drying energy consumption and further resource utilization.
Comparative example 2
1.0 ton of fresh blue algae mud with water content of 90% (w/v) and VS/TS of 91 percent is taken. 10kg of polyferric chloride and 35kg of calcium oxide are added, namely the total adding amount of the two filter aids is 45 percent (wt) of the weight of the dry matter of the blue algae. To facilitate the delivery of the materials by a screw pump, 3.0 tons of water are added to dilute the mixture to obtain 4.0 cubic blue algae slurry liquid. Pumping 4.0 cubic blue algae slurry into a diaphragm plate-and-frame filter press for filter pressing under normal temperature, keeping the pressure constant after the feeding pressure is increased to 1.25MPa, and discharging the hot filtrate to a collection tank.
When the filtrate flow rate decreased to 2.0L/min, the feed valve was closed. Pumping tap water into a diaphragm cavity of the filter press to press a filter cake in the diaphragm type plate-and-frame filter press, wherein the pressing pressure is 1.5 MPa. And (5) measuring the volume of the filtrate and the water content of the obtained blue algae cake in the filter pressing process.
Measuring that 4.0 tons of blue algae mud can be dehydrated and separated to obtain about 2800L of filtrate, 900L of residual feed liquid, and the actual volume reduction rate is 61%; the water content of the blue algae cake obtained by filter pressing is 68 percent, and the blue algae cake automatically falls off from the plate-and-frame machine. After the obtained algae cake is dried, the VS/TS is about 45 percent. The low calorific value of the obtained blue algae cake is only 370kcal/kg, which affects subsequent drying energy consumption and further resource utilization.
In conclusion, the blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement adopted by the invention has the advantages that the addition amount of the filter aid is small (less than 15% of the dry weight of the blue algae mud, wt), a large amount of conditioners such as lime, clay and the like are not required to be added, the cost is saved, meanwhile, the inorganic matter content in the blue algae cake can be reduced, the organic matter content and the heat value in the filter cake are relatively improved, the organic matter content after dehydration and drying is high (VS/TS is greater than 85%), the heat value is high, the expansion of utilization ways is facilitated, and the quality of subsequent resource products is improved.
Claims (8)
1. A blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement is characterized by comprising the following steps:
s1: adding one or more multivalent cation salts into the blue algae mud in a stirring device, wherein the total using amount of the multivalent cation salts is 3.0-15% of the mass of dry substances in the blue algae mud, stirring for 10-60 min to uniformly mix the blue algae mud, adjusting the pH value of the blue algae mud to be acidic, and simultaneously stirring and heating the materials to 70-100 ℃;
s2: preheating the dehydration device, keeping the internal temperature of the dehydration device at 70-100 ℃, and standing by;
s3: detecting whether the ratio of the storage modulus to the loss modulus of the cyanobacteria mud obtained in the S1 is less than 3.0, if the ratio is higher than 3.0, increasing the usage amount of the multivalent cation salt in the S1 until the ratio is less than 3.0, so as to ensure that the thermal rearrangement of the capsular polysaccharide soft lattice in the cyanobacteria mud occurs;
s4: keeping the temperature of S3 cyanobacteria mud at 70-100 ℃, and performing thermal rearrangement on soft lattices of capsular polysaccharide to change the water solubility and rheological properties of the cyanobacteria mud and promote deep filter pressing and dehydration of the cyanobacteria mud to be implemented; pumping the cyanobacteria sludge subjected to thermal rearrangement treatment to a preheated dehydration device;
s5: and adjusting the feeding pressure range of the dehydration device to be 0.5-2.5 MPa.
2. The method for deeply dehydrating the cyanobacteria mud based on thermal rearrangement of capsular polysaccharide soft lattice according to claim 1, characterized in that the initial water content of the cyanobacteria mud is between 85 and 95 percent.
3. The method for deeply dehydrating the cyanobacteria mud based on thermal rearrangement of capsular polysaccharide soft lattice according to claim 1, wherein the multivalent cation salt comprises one or more of ferric sulfate, aluminum sulfate, ferric chloride, aluminum chloride, ferric citrate, aluminum citrate, ferrous acetate and ferrous sulfate.
4. The blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement is characterized in that the pH value range is 1.5-5.
5. The deep dehydration method for blue algae mud based on capsular polysaccharide soft lattice thermal rearrangement according to any one of claims 1 to 4, characterized in that the dehydration device adopts a hot pressure filtration device.
6. The deep dehydration method for blue algae mud based on soft lattice thermal rearrangement of capsular polysaccharide according to claim 5, characterized in that the hot press filtration device is a diaphragm type plate-and-frame filter press, an ultrahigh pressure filter press or a spring type filter press.
7. The method for deeply dehydrating the cyanobacteria mud based on soft lattice thermal rearrangement of capsular polysaccharide according to claim 5, wherein the thermal filter pressing device comprises a filter plate and a filter cloth.
8. The deep dehydration method for blue algae mud based on capsular polysaccharide soft lattice thermal rearrangement as claimed in claim 7, wherein the filter plate and filter cloth are made of temperature-resistant materials, and the temperature-resistant range is above 120 ℃.
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| CN111747631A (en) * | 2020-07-14 | 2020-10-09 | 江南大学 | Method for promoting rapid dehydration of blue algae mud and preparing rod-shaped charcoal |
| CN113735394A (en) * | 2021-09-18 | 2021-12-03 | 江苏省农业科学院 | Preparation method of blue algae mud amino acid, product and application thereof |
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