CN115650439A - Artificial wetland substrate prepared from purified water sludge and preparation method thereof - Google Patents
Artificial wetland substrate prepared from purified water sludge and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an artificial wetland substrate prepared by using water-purifying sludge and a method thereof, belonging to the technical field of sludge recycling. The invention takes the purified water sludge of a water supply plant as the original, the purified water sludge is subjected to calcination and acid leaching pretreatment, then is compounded and sintered with bentonite to prepare a matrix substrate, then the blue algae is collected and crushed, ferric chloride is added for pressure filtration to obtain blue algae pressure filtrate, and finally the blue algae pressure filtrate and the matrix substrate are compounded to finally prepare the constructed wetland matrix, so that the prepared wetland matrix has excellent adsorbability and permeability and wide application prospect.
Description
Technical Field
The invention relates to an artificial wetland substrate prepared by using water-purifying sludge and a method thereof, belonging to the technical field of sludge recycling.
Background
At present, water resource shortage and water environment pollution are two important problems faced by the water environment in China, and especially for rural areas with weak economic strength and poor infrastructure construction, a large amount of untreated domestic sewage is directly discharged into various water bodies to seriously pollute the water ecological environment, so that the treatment of the sewage is urgent. The constructed wetland has the advantages of less investment, simple operation management, environment beautification and the like, and has wide application prospect in rural areas with weak economic strength in China. The matrix is used as a framework of the artificial wetland, and the particle size distribution, the porosity, the chemical composition and the like of the matrix are main factors influencing the purification effect and the service life of the wetland. The substrate not only directly removes pollutants through the effects of physical filtration, adsorption precipitation, ion exchange and chemical chelation reaction and the like, but also can provide carriers and nutrient substances for plants in the wetland, provides an attachment surface for microorganisms, and plays an irreplaceable role in the purification function of the artificial wetland.
The sludge of the water supply plant is derived from sludge discharge water of the water supply plant and mainly comprises filter backwashing drainage and sludge discharge water of a sedimentation tank or a clarification tank. The city water supply plant purifies the water supply source through a series of processes such as coagulation, sedimentation, filtration and disinfection, removes impurities such as suspended substances, colloidal substances and the like in the raw water, and supplies water meeting the water quality requirement to users in a pipe network distribution mode. A large amount of domestic water is produced, a large amount of wastewater and sludge are also produced, the sludge of the water supply plant is solid waste, and the treatment is generally carried out by adopting the modes of urban sewage plant treatment, mud cake throwing, land burial, sanitary landfill and the like, so that the subsequent treatment procedures of the water supply plant are increased, the treatment cost is improved, but the sludge has a small permeability coefficient and is not suitable for being directly used as a substrate of an artificial wetland, if the sludge of the water supply plant is used for producing ceramsite and is used as the substrate of the artificial wetland for treating domestic sewage, the harmless, resource and industrial treatment of the sludge of the water supply plant are realized, the sludge of the water supply plant is beneficial to protecting land resources and water resources, the construction investment, the operating cost and the like are reduced, and the sludge has high use value in the aspects of economic society, environment and the like.
In view of the above-mentioned drawbacks, the present designer has made active research and innovation to create an artificial wetland substrate prepared from purified water sludge and a preparation method thereof, so that the artificial wetland substrate has industrial utility value.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an artificial wetland substrate prepared by using purified water sludge and a method thereof.
The artificial wetland matrix prepared by using the water purification sludge comprises a matrix and blue algae press filtrate;
adjusting the pH value of the blue algae filter pressing liquid to 6.8-7.2 by sodium hydroxide;
the matrix is prepared by calcining purified water sludge of a water supply plant, carrying out acid leaching pretreatment, and then compounding and sintering with bentonite.
Furthermore, the grain diameter of the water purification sludge of the water supply plant is 30-90 μm, the content of silicon element is 24-26%, the content of iron element is 20-30%, the content of aluminum element is 2-5%, and the content of calcium element is 0.5-1.0%.
Furthermore, the blue algae filter-pressing liquid is prepared by crushing blue algae, adding ferric chloride and filter-pressing.
A preparation method of an artificial wetland matrix prepared by using purified water sludge comprises the following specific preparation steps:
adjusting the pH of the press filtrate to 6.8-7.2 by using sodium hydroxide, mixing the press filtrate after the pH adjustment and a matrix according to the mass ratio of 10. The blue algae is subjected to wall breaking treatment to form blue algae mud, the blue algae mud is subjected to deep dehydration by a thermal filter pressing method, ferric chloride is added to promote flocculation among blue algae cells, a large amount of ferric ions exist in filtrate generated by dehydration of the blue algae mud, the ferric ions can be flocculated and attached to a subsequent matrix through charge neutralization, the phosphorus adsorption and removal effect is improved, and heating of the blue algae mud can dissolve capsular polysaccharide outside the blue algae cells to form a filter pressing liquid rich in extracellular capsular polysaccharide, rheological property mucus and protein; and then adjusting the pH of the pressure filtrate to a specific range by using sodium hydroxide, keeping the contents of extracellular capsular polysaccharide, rheological mucus and protein in the pressure filtrate at high values, keeping the content of iron ions at high values, and then loading the pressure filtrate on the surface and in internal gaps of the matrix substrate by ultrasonic oscillation impregnation.
Further, the preparation method of the press filtrate comprises the following steps:
the method comprises the steps of putting blue algae into a wall breaking machine for crushing to obtain blue algae mud, adjusting the water content of the blue algae mud to 90% by using water, putting the blue algae mud into a reaction kettle, stirring at the rotating speed of 200-300 r/min, adding ferric chloride accounting for 25% of the dry weight of the blue algae mud in the stirring process, raising the temperature of the reaction kettle to 80 ℃, transferring the reaction kettle into a filter pressing device, and carrying out filter pressing at the pressure of 0.2Mpa to obtain filter pressing liquid.
Further, the preparation steps of the matrix are as follows:
mixing pretreated pure water sludge and bentonite according to a mass ratio of 3:2, then loading the mixture into a high-temperature calcining furnace, heating to 550 ℃ at a heating rate of 5 ℃/min, calcining for 10min, then heating to 900-1150 ℃, and carrying out heat preservation and calcination for 30-40 min to obtain the matrix substrate. The main constituent elements of the water purification sludge used in the invention are Si, al and Fe, so that the water purification sludge has strong adsorption capacity on phosphorus pollutants in the water quality of the wetland, and the main inorganic components of the water purification sludge mainly comprise silicon dioxide, aluminum oxide and ferric oxide, thereby meeting the requirements of the preparation raw materials of ceramsite; the water purification sludge has small particle size and strong plasticity, does not need to be dried and ground, and saves the manufacturing cost; in addition, the water-purified sludge has high organic matter content and contains a certain proportion of water, the organic matter volatilizes in the high-temperature firing process, the pore-forming effect can be realized, the porosity and the specific surface area of the matrix are improved, the adsorbability and the permeability of the matrix are further improved, meanwhile, the bentonite is used as an auxiliary material, the bentonite has good cementing capacity and can be used as an adhesive, and the strength of the matrix obtained by final sintering is improved;
further, the preparation method of the pretreated pure water sludge comprises the following steps:
drying the water purification sludge of a water supply plant, then placing the water purification sludge into a muffle furnace, calcining for 1-2 h at 400-450 ℃, mixing and soaking the calcined water purification sludge and hydrochloric acid with the concentration of 2.5mol/L for 3-4 h according to the solid-to-liquid ratio of 1:1, filtering and separating to obtain filter residue, and drying to obtain the pretreated water purification sludge. According to the invention, humic acid substances, some interference metal ions and carbon components in the water purification sludge are removed through high-temperature calcination and pickling treatment, and the pore diameter of the water purification sludge particles is improved, so that the adsorption and permeability of the water purification sludge are improved;
by the scheme, the invention at least has the following advantages:
(1) According to the invention, firstly, humic acid substances, some interference metal ions and carbon components in the water purification sludge are removed through high-temperature calcination and pickling treatment, and the pore diameter of the water purification sludge particles is improved, so that the adsorption and permeability of the water purification sludge are improved;
(2) The main constituent elements of the water purification sludge used in the invention are Si, al and Fe, so that the water purification sludge has strong adsorption capacity on phosphorus pollutants in the water quality of the wetland, and the main inorganic components of the water purification sludge mainly comprise silicon dioxide, aluminum oxide and ferric oxide, thereby meeting the requirements of the preparation raw materials of ceramsite; the water purification sludge has small particle size and strong plasticity, and does not need to be dried and ground, so that the manufacturing cost is saved; in addition, the water-purified sludge has high organic matter content and contains a certain proportion of water, the organic matter volatilizes in the high-temperature firing process, the pore-forming effect can be realized, the porosity and the specific surface area of the matrix are improved, the adsorbability and the permeability of the matrix are further improved, meanwhile, the bentonite is used as an auxiliary material, the bentonite has good cementing capacity and can be used as an adhesive, and the strength of the matrix obtained by final sintering is improved;
(3) The blue algae is subjected to wall breaking treatment to form blue algae mud, the blue algae mud is subjected to deep dehydration by a thermal filter pressing method, ferric chloride is added to promote flocculation among blue algae cells, a large amount of ferric ions exist in filtrate generated by dehydration of the blue algae mud, the ferric ions can be flocculated and attached to a subsequent matrix through charge neutralization, the phosphorus adsorption and removal effect is improved, and heating of the blue algae mud can dissolve capsular polysaccharide outside the blue algae cells to form a filter pressing liquid rich in extracellular capsular polysaccharide, rheological property mucus and protein; and then adjusting the pH of the pressure filtrate to a specific range by using sodium hydroxide, keeping the contents of extracellular capsular polysaccharide, rheological mucus and protein in the pressure filtrate at high values, keeping the content of iron ions at high values, and then loading the pressure filtrate on the surface and in internal gaps of the matrix substrate by ultrasonic oscillation impregnation.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a clear understanding of the technical features of the present invention.
Detailed Description
The following examples are given to further illustrate embodiments of the present invention. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
(1) Drying purified water sludge of a water supply plant, then placing the dried purified water sludge into a muffle furnace, calcining the calcined purified water sludge for 1 to 2 hours at the temperature of between 400 and 450 ℃, mixing and soaking the calcined purified water sludge and hydrochloric acid with the concentration of 2.5mol/L for 3 to 4 hours according to the solid-to-liquid ratio of 1:1, filtering and separating the mixture to obtain filter residue, and drying the filter residue to obtain pretreated purified water sludge; the particle size of the water purification sludge is 30-90 mu m, the content of silicon element is 24-26%, the content of iron element is 20-30%, the content of aluminum element is 2-5%, and the content of calcium element is 0.5-1.0%; humic acid substances, some interference metal ions and carbon components in the purified water sludge are removed through high-temperature calcination and acid leaching treatment, and the pore diameter of the purified water sludge particles is increased, so that the adsorption and permeability of the purified water sludge are improved;
(2) Mixing the pretreated purified water sludge and bentonite according to the mass ratio of 3:2, then loading the mixture into a high-temperature calcining furnace, firstly heating to 550 ℃ at the heating rate of 5 ℃/min, calcining for 10min, then heating to 900-1150 ℃, and carrying out heat preservation and calcination for 30-40 min to obtain a matrix substrate; the main constituent elements of the water purification sludge used in the invention are Si, al and Fe, so that the water purification sludge has strong adsorption capacity on phosphorus pollutants in wetland water quality, and the main inorganic components of the water purification sludge mainly comprise silicon dioxide, aluminum oxide and iron oxide, thereby meeting the requirements of ceramsite preparation raw materials; the water purification sludge has small particle size and strong plasticity, and does not need to be dried and ground, so that the manufacturing cost is saved; in addition, the water-purified sludge has high organic matter content and contains a certain proportion of water, the organic matter volatilizes in the high-temperature firing process, the pore-forming effect can be realized, the porosity and the specific surface area of the matrix are improved, the adsorbability and the permeability of the matrix are further improved, meanwhile, the bentonite is used as an auxiliary material, the bentonite has good cementing capacity and can be used as an adhesive, and the strength of the matrix obtained by final sintering is improved;
(3) The method comprises the steps of putting blue algae into a wall breaking machine for crushing to obtain blue algae mud, adjusting the water content of the blue algae mud to 90% by using water, putting the blue algae mud into a reaction kettle, stirring at the rotating speed of 200-300 r/min, adding ferric chloride accounting for 25% of the dry weight of the blue algae mud in the stirring process, raising the temperature of the reaction kettle to 80 ℃, transferring the reaction kettle into a filter pressing device, and carrying out filter pressing at the pressure of 0.2Mpa to obtain filter pressing liquid; blue algae is subjected to wall breaking treatment to form blue algae mud, deep dehydration is performed on the blue algae mud by a thermal pressure filtration method, ferric chloride is added to promote flocculation among blue algae cells, a large amount of ferric ions exist in filtrate generated by dehydration of the blue algae mud, the ferric ions can be flocculated and attached to a subsequent matrix through charge neutralization, the phosphorus adsorption and removal effect is improved, and heating of the blue algae mud can dissolve capsular polysaccharide outside the blue algae cells to form a pressure filtrate rich in extracellular capsular polysaccharide, rheological mucus and protein;
(4) And (2) adjusting the pH value of the pressure filtrate to 6.8-7.2 by using sodium hydroxide, mixing the pressure filtrate after pH adjustment and a matrix according to the mass ratio of 10 to 1, then putting the mixture into an ultrasonic oscillator, carrying out ultrasonic oscillation and immersion for 2-3 h at the frequency of 30-40 kHz, filtering and separating to obtain a filter cake, and carrying out vacuum freeze-drying to obtain the artificial wetland matrix. Firstly, adjusting the pH of the pressure filtrate to a specific range by using sodium hydroxide, keeping the contents of extracellular capsular polysaccharide, rheological mucus and protein in the pressure filtrate at high values and the content of iron ions at high values, then loading the pressure filtrate on the surface and in internal gaps of a matrix substrate by ultrasonic oscillation impregnation, wherein the extracellular polymers in the pressure filtrate have loose structures and fluidity, can improve the distance between the matrix substrates after being loaded on the surface of the matrix substrate and improve the permeability of the matrix substrates as wetland substrates, and in addition, the extracellular polymers have flocculation chelation effect and have adsorption removal effect on pollutants in the wetland water quality.
Example 1
(1) Drying purified water sludge of a water supply plant, putting the dried purified water sludge into a muffle furnace, calcining for 1h at 400 ℃, mixing and soaking the calcined purified water sludge and hydrochloric acid with the concentration of 2.5mol/L for 3h according to the solid-to-liquid ratio of 1:1, filtering and separating to obtain filter residue, and drying to obtain pretreated purified water sludge;
(2) Mixing the pretreated purified water sludge and bentonite according to the mass ratio of 3:2, then loading the mixture into a high-temperature calcining furnace, firstly heating to 550 ℃ at the heating rate of 5 ℃/min, calcining for 10min, then heating to 900 ℃, and carrying out heat preservation and calcination for 30min to obtain a matrix substrate;
(3) Crushing blue algae in a wall breaking machine to obtain blue algae mud, adjusting the water content of the blue algae mud to 90% by using water, putting the blue algae mud into a reaction kettle, stirring at the rotating speed of 200r/min, adding ferric chloride accounting for 25% of the dry weight of the blue algae mud in the stirring process, raising the temperature of the reaction kettle to 80 ℃, transferring the mixture into a filter pressing device, and performing filter pressing at the pressure of 0.2Mpa to obtain filter pressing liquid;
(4) And (2) adjusting the pH of the press filtrate to 6.8 by using sodium hydroxide, mixing the press filtrate after the pH adjustment and a matrix according to a mass ratio of 10.
Example 2
(1) Drying clean water sludge of a water supply plant, putting the dried clean water sludge into a muffle furnace, calcining for 2 hours at 430 ℃, mixing and soaking the calcined clean water sludge and hydrochloric acid with the concentration of 2.5mol/L for 4 hours according to the solid-to-liquid ratio of 1:1, filtering and separating to obtain filter residue, and drying to obtain pretreated clean water sludge;
(2) Mixing the pretreated purified water sludge and bentonite according to the mass ratio of 3:2, then loading the mixture into a high-temperature calcining furnace, firstly heating to 550 ℃ at the heating rate of 5 ℃/min, calcining for 10min, then heating to 1000 ℃, and preserving heat and calcining for 35min to obtain a matrix substrate;
(3) The method comprises the steps of putting blue algae into a wall breaking machine for crushing to obtain blue algae mud, adjusting the water content of the blue algae mud to 90% by using water, putting the blue algae mud into a reaction kettle, stirring at the rotating speed of 250r/min, adding ferric chloride accounting for 25% of the dry weight of the blue algae mud in the stirring process, raising the temperature of the reaction kettle to 80 ℃, transferring the reaction kettle into a filter pressing device, and carrying out filter pressing at the pressure of 0.2Mpa to obtain filter pressing liquid;
(4) And (2) adjusting the pH of the pressure filtrate to 7.0 by using sodium hydroxide, mixing the pressure filtrate after pH adjustment and a matrix according to a mass ratio of 10.
Example 3
(1) Drying purified water sludge of a water supply plant, putting the dried purified water sludge into a muffle furnace, calcining for 2 hours at 450 ℃, mixing and soaking the calcined purified water sludge and hydrochloric acid with the concentration of 2.5mol/L for 4 hours according to the solid-to-liquid ratio of 1:1, filtering and separating to obtain filter residue, and drying to obtain pretreated purified water sludge;
(2) Mixing the pretreated purified water sludge and bentonite according to a mass ratio of 3:2, then loading the mixture into a high-temperature calcining furnace, firstly heating to 550 ℃ at a heating rate of 5 ℃/min, calcining for 10min, then heating to 1150 ℃, and carrying out heat preservation and calcination for 40min to obtain a matrix substrate;
(3) The method comprises the steps of putting blue algae into a wall breaking machine for crushing to obtain blue algae mud, adjusting the water content of the blue algae mud to 90% by using water, putting the blue algae mud into a reaction kettle, stirring at the rotating speed of 300r/min, adding ferric chloride accounting for 25% of the dry weight of the blue algae mud in the stirring process, raising the temperature of the reaction kettle to 80 ℃, transferring the reaction kettle into a filter pressing device, and carrying out filter pressing at the pressure of 0.2Mpa to obtain filter pressing liquid;
(4) And (2) adjusting the pH of the pressure filtrate to 7.2 by using sodium hydroxide, mixing the pressure filtrate after pH adjustment and a matrix according to a mass ratio of 10.
Comparative example
Comparative example 1:
the preparation method of the comparative example 1 is basically the same as that of the inventive example 1, except that the step (1) treatment is not performed, that is, the purified water sludge is not subjected to the high-temperature pickling pretreatment, and the artificial wetland substrate is prepared in the same way;
comparative example 2:
the preparation method of the comparative example 2 is basically the same as that of the inventive example 1, except that the step (2) is not performed, that is, the artificial wetland substrate is prepared by directly using the pretreated sludge as the substrate;
comparative example 3:
the preparation methods of the comparative example 3 and the inventive example 1 are basically the same, except that the treatment of the steps (3) and (4) is not performed, that is, the substrate matrix is directly used as the substrate of the artificial wetland, and the substrate of the artificial wetland is prepared in the same way;
comparative example 4:
the control example 4 was prepared in substantially the same manner as in example 1 of the present invention, except that the pH of the filtrate obtained by adjusting the pressure in the step (4) was not in the range of 6.8 to 7.2, and the substrate for artificial wetland was prepared in the same manner.
Detection method
The performance of examples 1 to 3 of the present invention and comparative examples 1 to 3 were measured, and the results are shown in table 1:
the detection method comprises the following steps:
(1) And (3) permeability coefficient testing: the measurement is carried out by adopting a 70 type (imitation Kilman type) permeameter (Nanjing hydroelectric power instrument factory), and the higher the permeability coefficient is, the better the permeability is;
(2) And (3) testing the adsorption performance: putting the constructed wetland substrate into simulated water with inlet water total phosphorus of 1.32mg/L and COD of 76mg/L, and detecting the adsorption removal rate of total phosphorus and COD in water after 10 days, wherein the higher the removal rate is, the better the adsorption performance is;
TABLE 1 Performance test results
As can be seen from the detection data in the above table, the wetland substrates finally prepared in the embodiments 1 to 3 of the present invention have excellent adsorption performance and permeability, and thus the technical scheme of the present application has high feasibility;
comparing example 1 with comparative example 1, the adsorption and permeability of the final wetland matrix are reduced because the comparative example 1 does not perform the treatment of the step (1), namely, the purified water sludge is not subjected to high-temperature pickling pretreatment, and the artificial wetland matrix is also prepared, so that the invention can be proved that humic acid substances, interference metal ions and carbon components in the purified water sludge are removed through high-temperature calcination and pickling treatment, the pore diameter of the purified water sludge particles is increased, and the adsorption and permeability of the purified water sludge are improved;
comparing the embodiment 1 with the comparative example 2, the comparative example 2 does not perform the treatment of the step (2), namely the pretreated sludge is directly used as a substrate matrix and is also prepared into an artificial wetland substrate, so that the adsorbability and the permeability of the final wetland substrate are obviously reduced, and therefore, the water purification sludge used in the invention has strong adsorption capacity on phosphorus pollutants in wetland water quality, and the main inorganic components of the water purification sludge mainly comprise silicon dioxide, aluminum oxide and iron oxide and meet the requirement of raw materials for preparing ceramsite; the water purification sludge has small particle size and strong plasticity, and does not need to be dried and ground, so that the manufacturing cost is saved; in addition, the water-purified sludge has high organic matter content and contains a certain proportion of water, the organic matter volatilizes in the high-temperature firing process, the pore-forming effect can be realized, the porosity and the specific surface area of the matrix are improved, the adsorbability and the permeability of the matrix are further improved, meanwhile, the bentonite is used as an auxiliary material, the bentonite has good cementing capacity and can be used as an adhesive, and the strength of the matrix obtained by final sintering is improved;
comparing the example 1 with the comparative example 3 and the comparative example 4, since the comparative example 3 does not perform the treatment of the steps (3) and (4), that is, the substrate matrix is directly used as the constructed wetland substrate to prepare the constructed wetland substrate in the same way, the pH range of the pressure filtrate in the step (4) of the comparative example 4 is not between 6.8 and 7.2, and the constructed wetland substrate is prepared in the same way, the adsorbability and the permeability of the final wetland substrate are remarkably reduced, so that the blue algae mud is formed after the blue algae wall breaking treatment, the blue algae mud is deeply dehydrated by the hot pressure filtration method, ferric chloride is added to promote flocculation between blue algae cells, a large amount of ferric ions exist in the filtrate generated by the dehydration of the blue algae mud, and the ferric ions can be attached through charge neutralization and subsequent flocculation of the substrate matrix, the adsorption and removal effects on phosphorus are improved, and the heating of the blue algae mud can dissolve the capsular polysaccharides outside the blue algae cells to form the pressure filtrate rich in extracellular capsular polysaccharides, mucus and proteins; and then adjusting the pH of the pressure filtrate to a specific range by using sodium hydroxide, keeping the contents of extracellular capsular polysaccharide, rheological mucus and protein in the pressure filtrate at high values, keeping the content of iron ions at high values, and then loading the pressure filtrate on the surface and in internal gaps of the matrix substrate by ultrasonic oscillation impregnation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. An artificial wetland matrix prepared by using purified water sludge is characterized in that: comprises a matrix and blue algae press filtrate;
adjusting the pH value of the blue algae filter pressing liquid to 6.8-7.2 by sodium hydroxide;
the matrix is prepared by calcining purified water sludge of a water supply plant, carrying out acid leaching pretreatment, and then compounding and sintering with bentonite.
2. The constructed wetland substrate prepared by using purified water sludge as claimed in claim 1, which is characterized in that: the grain size of the water purification sludge of the water supply plant is 30-90 mu m, the content of silicon element is 24-26%, the content of iron element is 20-30%, the content of aluminum element is 2-5%, and the content of calcium element is 0.5-1.0%.
3. The constructed wetland substrate prepared by using purified water sludge as claimed in claim 1, which is characterized in that: the blue algae filter pressing liquid is prepared by crushing blue algae, adding ferric chloride and filter pressing.
4. The method for preparing the artificial wetland substrate by using the purified water sludge according to claim 1, which is characterized by comprising the following specific preparation steps:
adjusting the pH of the press filtrate to 6.8-7.2 by using sodium hydroxide, mixing the press filtrate after the pH adjustment and a matrix according to the mass ratio of 10.
5. The method for preparing the artificial wetland substrate from the purified water sludge according to claim 4, wherein the method comprises the following steps: the preparation steps of the press filtrate are as follows:
the method comprises the steps of putting blue algae into a wall breaking machine for crushing to obtain blue algae mud, adjusting the water content of the blue algae mud to 90% by using water, putting the blue algae mud into a reaction kettle, stirring at the rotating speed of 200-300 r/min, adding ferric chloride accounting for 25% of the dry weight of the blue algae mud in the stirring process, raising the temperature of the reaction kettle to 80 ℃, transferring the reaction kettle into a filter pressing device, and carrying out filter pressing at the pressure of 0.2Mpa to obtain filter pressing liquid.
6. The method for preparing the artificial wetland substrate by using the purified water sludge as claimed in claim 4, wherein the method comprises the following steps: the preparation steps of the matrix are as follows:
mixing pretreated pure water sludge and bentonite according to a mass ratio of 3:2, then loading the mixture into a high-temperature calcining furnace, heating to 550 ℃ at a heating rate of 5 ℃/min, calcining for 10min, then heating to 900-1150 ℃, and carrying out heat preservation and calcination for 30-40 min to obtain the matrix substrate.
7. The method for preparing the artificial wetland substrate by using the purified water sludge as claimed in claim 6, wherein the method comprises the following steps: the preparation method of the pretreated pure water sludge comprises the following steps:
drying the water purification sludge of a water supply plant, then placing the water purification sludge into a muffle furnace, calcining for 1-2 h at 400-450 ℃, mixing and soaking the calcined water purification sludge and hydrochloric acid with the concentration of 2.5mol/L for 3-4 h according to the solid-to-liquid ratio of 1:1, filtering and separating to obtain filter residue, and drying to obtain the pretreated water purification sludge.
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