Aquatic plant planting matrix filler and preparation method thereof

Abstract

The present application relates to the field of urban sewage and resource recycling technology, and specifically discloses an aquatic plant planting matrix filler and a preparation method thereof, wherein the aquatic plant planting matrix filler comprises the following raw materials in parts by weight: 20-45 parts of iron oxide, 15-25 parts of aluminum oxide, 2-10 parts of calcium oxide, 5-15 parts of silicon dioxide, 1-10 parts of tourmaline powder, 15-50 parts of carbon material powder, 0.5-2 parts of binder, 10-50 parts of water, and 0.1-1 parts of titanium dioxide. The present application adjusts the types and dosages of various raw materials of the aquatic plant planting matrix filler, and adjusts various processes during the firing of the aquatic plant planting matrix filler. After the aquatic plant planting matrix filler is applied to urban sewage treatment, the treated water quality is tested, and the removal efficiency of chemical oxygen demand, biochemical oxygen demand and total phosphorus is high, and the aquatic plant planting matrix filler has a good urban sewage purification effect.

Description

Technical Field

[0001] The present application relates to the technical field of urban sewage and resource recycling, and more specifically, to a method for preparing a matrix filler for aquatic plant planting. Background Art

[0002] At present, urban sewage treatment mainly includes traditional physical and chemical treatment processes and biological treatment processes. The existing urban sewage treatment A / O process can simultaneously remove organic matter and nitrogen, and is suitable for treating nitrogen-containing sewage. It can effectively treat urban sewage to a certain extent. However, the A / O process also has some disadvantages. It has a large demand for oxygen, consumes a lot of energy, and is affected by many factors such as fluctuations in influent water quality and operating costs. It still cannot effectively remove some difficult-to-degrade organic matter, phosphorus, nitrogen and other soluble pollutants in sewage.

[0003] Aquatic plant planting matrix fillers refer to fillers used for the growth of aquatic plants, usually used in artificial wetlands, sewage treatment facilities and other places. Aquatic plant planting matrix fillers can provide the support, nutrients and growth space required for the growth of aquatic plants, and can also serve as a growth matrix for microorganisms, which is beneficial to water purification and sewage treatment.

[0004] Therefore, when aquatic plants and matrix fillers are combined on the basis of A / O process to treat sewage, aquatic plants planted in matrix fillers can form biofilms on the surface and inside of the fillers, and the fillers can provide a large amount of biological attachment area, which is conducive to the attachment and growth of bacteria, algae and other microorganisms, so that microorganisms can decompose organic matter, absorb and transform nutrients, thereby purifying water quality. At the same time, the roots of aquatic plants can also effectively remove organic matter, nitrogen, phosphorus and other pollutants in sewage by absorbing nutrients and redox reactions, thereby improving the sewage purification effect.

[0005] Therefore, there is a need for a sewage-treating, sewage-resistant, aquatic plant planting matrix filler with good biological attachment, air permeability, water retention, corrosion resistance, physical strength, and non-toxic and harmless properties to improve the purification effect of urban sewage. Summary of the invention

[0006] In order to improve the purification effect of urban sewage, the present application provides an aquatic plant planting matrix filler and a preparation method thereof.

[0007] In a first aspect, the present application provides an aquatic plant planting matrix filler, which adopts the following technical solution:

[0008] A matrix filler for aquatic plant planting comprises the following raw materials in parts by weight: 20-45 parts of iron oxide, 15-25 parts of aluminum oxide, 2-10 parts of calcium oxide, 5-15 parts of silicon dioxide, 1-10 parts of tourmaline powder, 15-50 parts of carbon material powder, 0.5-2 parts of binder, 10-50 parts of water and 0.1-1 parts of titanium dioxide.

[0009] The raw materials for the aquatic plant planting matrix filler of the present application can be selected from any value within the respective ranges of 20-45 parts of iron oxide, 15-25 parts of aluminum oxide, 2-10 parts of calcium oxide, 5-15 parts of silicon dioxide, 1-10 parts of tourmaline powder, 15-50 parts of carbon material powder, 0.5-2 parts of binder, 10-50 parts of water, and 0.1-1 parts of titanium dioxide, and can promote the growth of aquatic plants and improve the water purification effect.

[0010] By adopting the above technical scheme, 20-45 parts by weight of iron oxide is added to the raw material of the aquatic plant planting matrix filler of the present application, and the following effects can be played in the aquatic plant planting matrix filler: (1) Iron oxide contains iron, which is one of the trace elements necessary for plant growth and development, and is essential for the chlorophyll synthesis and respiration of plants. Therefore, an appropriate amount of iron oxide can provide aquatic plants with the required trace elements, which is beneficial to the growth and health of plants. (2) Iron oxide has a certain adsorption capacity and can adsorb phosphorus, heavy metals and other harmful substances in water, which helps to purify water quality and improve the environment of water bodies. (3) An appropriate amount of iron oxide can enhance the structural stability of the soil and help the root attachment and growth of aquatic plants. (4) The presence of iron oxide can have a certain effect on the pH value of the soil, help maintain a suitable soil acidity and alkalinity, and play a certain regulatory role in the growth of aquatic plants.

[0011] Alumina of 15-25 parts by weight is selected, which can play the following roles in the aquatic plant planting matrix filler: (1) Alumina has a certain granular structure, which can provide support and attachment basis for the roots of aquatic plants, helping to maintain the growth stability of aquatic plants. (2) An appropriate amount of alumina can help maintain the aeration and drainage of the soil, help avoid water accumulation and hypoxia in the soil, and is conducive to the growth of aquatic plants. (3) Alumina has a certain adsorption capacity and can absorb organic matter, heavy metals and other pollutants in the water, playing a role in purifying water quality. (4) Alumina contains aluminum. An appropriate amount of aluminum has a certain promoting effect on plant growth and can provide aquatic plants with the required trace elements.

[0012] Calcium oxide is selected in an amount of 2-10 parts by weight. It can play the following roles in the matrix filler for aquatic plant cultivation: (1) Calcium oxide can neutralize the acidity of the soil, increase the pH value of the soil, and improve the acidic soil environment. For some alkaline-loving aquatic plants, it is very important to provide suitable soil pH. (2) Calcium oxide can provide aquatic plants with the required calcium element and promote plant growth and development. Calcium plays an important role in the formation of plant cell walls and cell division, and helps to enhance the disease resistance and stress resistance of plants. (3) Calcium oxide can improve the structure of the soil, increase the air permeability and water retention of the soil, and is beneficial to the root growth and nutrient absorption of aquatic plants. (4) Calcium oxide can also play a catalytic role during the firing process of the matrix filler preparation, which is beneficial to the firing process.

[0013] By using 20-35 parts of iron oxide, 15-25 parts of aluminum oxide and 2-10 parts of calcium oxide, iron oxide and aluminum oxide can absorb or release hydrogen ions, thereby adjusting the pH value of the matrix filler and helping to maintain a suitable growth environment; secondly, iron, aluminum and calcium elements promote the growth and development of aquatic plants and can be released through the matrix filler for absorption and utilization by aquatic plants. Moreover, the granular structure of metal oxides can provide structural support for the matrix filler to a certain extent, helping to maintain the air permeability and drainage of the matrix, thereby improving the purification effect of urban sewage.

[0014] The application adds 5-15 parts by weight of silica to the raw materials of the aquatic plant planting matrix filler, which can play the following roles: (1) Silica has a granular structure, which can provide support and attachment basis for the roots of aquatic plants, and help maintain the growth stability of aquatic plants. (2) Silica can help maintain the aeration and drainage of the soil, help avoid water accumulation and hypoxia in the soil, and is conducive to the growth of aquatic plants. (3) Silica contains silicon, which has a certain promoting effect on plant growth, can enhance the disease resistance and stress resistance of plants, and is conducive to the healthy growth of aquatic plants. (4) Silica has a certain adsorption capacity, which can adsorb organic matter, heavy metals and other pollutants in water, and play a role in purifying water quality.

[0015] The present application adds 1-10 parts by weight of tourmaline powder to the raw materials of aquatic plant planting matrix fillers, which can play the following roles: (1) Tourmaline powder can neutralize the acidity of the soil, increase the pH value of the soil, and improve the acidic soil environment. For some alkaline-loving aquatic plants, it is very important to provide suitable soil pH. (2) Tourmaline powder is rich in calcium and trace elements, which can provide the necessary nutrients for aquatic plants and promote plant growth and development. Calcium plays an important role in the formation of plant cell walls and cell division, and helps to enhance the disease resistance and stress resistance of plants. (3) Tourmaline powder can improve the structure of the soil, increase the air permeability and water retention of the soil, and is beneficial to the root growth and nutrient absorption of aquatic plants. (4) Tourmaline powder has a catalytic effect, which can promote the reaction between the raw materials of the planting matrix fillers during the firing process, and help the formation of the aquatic plant planting matrix fillers.

[0016] The present application adds 15-50 parts by weight of carbon material powder to the raw material of the aquatic plant planting matrix filler, which can play the following roles: (1) The carbon material powder can increase the water retention of the soil, help keep the soil moist, reduce water evaporation, and thus provide a suitable water environment for the growth of aquatic plants. (2) The carbon material powder can improve the aeration of the soil, help improve the air permeability of the soil, promote the supply of oxygen in the soil, and facilitate the respiration and growth of the roots of aquatic plants. (3) The carbon material powder can neutralize the acidity of the soil, help increase the pH value of the soil, and improve the acidic soil environment. For some alkaline-loving aquatic plants, it is very important to provide a suitable soil pH. (4) The carbon material powder has a certain adsorption and decomposition effect on organic matter, helps degrade organic matter in the soil, reduces the decay products of organic matter, and thus improves the soil environment. (5) Some carbon material powders are rich in trace elements, which can provide the required nutrients for aquatic plants and promote the growth and development of plants.

[0017] The present application adds 0.5-2 parts by weight of a binder to the raw materials of the matrix filler for aquatic plant planting, which can play the following roles: (1) The binder can bind the matrix filler together to form a stable overall structure, prevent the filler from loosening and floating, and is conducive to the growth of aquatic plants and the fixation of the root system. (2) An appropriate amount of binder can increase the density of the matrix filler while maintaining a certain water permeability, which helps to maintain appropriate soil moisture and air permeability, and promote the growth and nutrient absorption of the roots of aquatic plants. (3) The binder can slow down the loss of nutrients, improve the matrix filler's ability to retain nutrients, and help provide a stable nutritional environment for aquatic plants. (4) Through the action of the binder, the stability of the matrix filler is enhanced, which is conducive to preventing water scouring and soil erosion, and maintaining the growth environment of aquatic plants.

[0018] The 10-50 parts by weight of water in the matrix filler of the present application can play a role in maintaining humidity, help transport nutrients and oxygen in the soil to the root system of the aquatic plants, and promote nutrient absorption and growth of the aquatic plants.

[0019] The present application adds 0.1-1 parts by weight of titanium dioxide to the raw materials of the aquatic plant planting matrix filler, which can play the following roles: (1) Titanium dioxide has antibacterial and anti-biological pollution effects, which can effectively inhibit the growth of bacteria, algae and other microorganisms in the aquatic plant planting matrix filler, reduce the decay and pollution of the matrix filler, and help maintain the cleanliness and health of the aquatic plant growth environment. (2) Titanium dioxide can play a photocatalytic role under light conditions, produce active oxygen, help decompose organic matter in the water and kill microorganisms in the water, and improve the water quality environment. (3) The photocatalytic effect of titanium dioxide helps to decompose organic matter, release nutrients such as organic nitrogen and phosphorus, improve the utilization efficiency of nutrients, and promote the growth of aquatic plants. (4) The photocatalytic effect of titanium dioxide can inhibit the growth of algae in the water, reduce algae pollution in the aquatic plant planting matrix filler, and keep the water clean.

[0020] Preferably, the aquatic plant planting matrix filler includes the following raw materials in parts by weight: 25-35 parts of iron oxide, 15-25 parts of aluminum oxide, 4-8 parts of calcium oxide, 9-11 parts of silicon dioxide, 4-6 parts of tourmaline powder, 30-40 parts of carbon material powder, 1.0-1.4 parts of binder, 25-35 parts of water, and 0.4-0.6 parts of titanium dioxide.

[0021] In a second aspect, the present application provides a method for preparing an aquatic plant planting matrix filler.

[0022] A method for preparing the aquatic plant planting matrix filler comprises mixing the above raw materials, pressing them into a planting matrix blank and distributing holes therein, firing them, and then cooling them naturally to obtain the matrix filler.

[0023] By adopting the above technical scheme, the above raw materials are mixed, the different materials are fully mixed and evenly mixed, and pressed into a planting matrix blank so that the materials are tightly combined to form a certain blank shape, providing a basis for subsequent processing and use; the planting matrix blank is fired to increase the mechanical strength and stability of the filler, improve the pore structure of the filler, and improve the biological adsorption capacity of the filler. The holes are distributed so that when the subsequent finished matrix filler is placed in sewage, the aquatic plants are placed in the holes to play a fixing role, which is more conducive to its growth in sewage. In water flows with relatively high flow rates, it can also prevent lodging and being washed away; natural cooling is to allow the filler blank to gradually cool down under stable environmental conditions to avoid internal stress and cracks caused by rapid cooling.

[0024] Preferably, the planting matrix blank further comprises a sealing step before firing; the sealing step is: spreading a mixture of coal powder and biomass powder in the gaps between the planting matrix blank layers.

[0025] The planting matrix blanks must be fired in an oxygen-deficient state to achieve reduction roasting. Under reduction roasting conditions, the fuel and oxygen supply are insufficient, resulting in the combustion gas containing a large amount of reducing gases (such as CO and H2), which can react with oxidizing gases (such as O2) and oxidizing substances, thereby reducing oxidizing substances and making the planting matrix blanks more stable and less prone to rot, thereby improving the physical properties of the planting matrix blanks and making them more suitable for the growth of aquatic plants.

[0026] By adopting the above technical scheme, a mixture of coal powder and biomass powder is used in the sealing step to spread in the gap between the planting matrix blank layers, so that an airtight oxygen-deficient environment is formed during the firing process to prevent excessive oxygen from entering the filler. The main function of the coal powder is to absorb and utilize the oxygen in the enclosed space during the firing process, so that the sintering process is in an oxygen-deficient atmosphere; the main function of the biomass powder is to effectively seal the firing container to prevent heat loss, so that the temperature difference between the inside and outside of the blank is small during firing, which is beneficial to the uniform shrinkage and sintering of the blank. The coordinated use of the two is beneficial to the sintering and molding of the planting matrix blank, can better control the sintering process of the filler, is beneficial to the reduction of metal oxides in the filler, and improves the sintering efficiency and quality of the filler, thereby improving the mechanical strength and stability of the filler.

[0027] Preferably, in the mixture of coal powder and biomass powder, the weight ratio of coal powder to biomass powder is 1:(0.2-1).

[0028] By adopting the above technical solution and adjusting the weight ratio of coal powder to biomass powder to 1:(0.2-1), the sintering process of the filler can be further controlled, thereby improving the purification effect of urban sewage.

[0029] Preferably, the firing temperature is 700-1600° C. and the firing time is 48-75 hours.

[0030] By adopting the above technical scheme, the firing temperature is adjusted to 700-1600°C and the time is 48-75 hours, which can promote better combination of substances in the raw materials during the sintering process, form a stronger structure, and improve the mechanical strength and stability of the filler; the pore structure of the filler can be improved to make it more suitable for the penetration of water and oxygen, which is beneficial to the growth and ventilation of plant roots; the surface properties of the filler can be improved, the biological attachment ability of the filler can be improved, which is beneficial to the growth of aquatic plants and the attachment of roots; the microorganisms and harmful substances in the filler can be killed, the biological contamination of the filler can be reduced, and it is beneficial to the healthy growth of aquatic plants.

[0031] Preferably, the fineness of the planting matrix raw material is 180-200 mesh.

[0032] By adopting the above technical scheme, the fineness of the planting matrix blank raw material is controlled within the range of 180-200 mesh, which can make the size of the filler particles more uniform, which is beneficial to the uniform sintering of the filler during the sintering process, and is beneficial to the stability of the filler, making the filler stronger and more durable; it can also form a more uniform pore structure, which is beneficial to the penetration of water and oxygen, and improves the air permeability and water permeability of the filler; and it can also improve the biological attachment ability of the filler, which is beneficial to the root attachment and growth of aquatic plants.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] (1) The present application improves the purification effect of urban sewage by adjusting the types and dosages of the raw materials of the aquatic plant planting matrix filler so that the obtained aquatic plant planting matrix filler is applied in urban sewage treatment.

[0035] (2) The present application adjusts various processes during the firing of aquatic plant planting matrix filler, and uses coal carbon powder and biomass powder for sealed firing, so that the obtained aquatic plant planting matrix filler can be used in urban sewage treatment, thereby further improving the purification effect of urban sewage.

[0036] (3) In this application, the aquatic plant planting matrix filler obtained by adjusting the type and dosage of each raw material of the aquatic plant planting matrix filler and adjusting the various processes during the firing of the aquatic plant planting matrix filler is applied to urban sewage treatment. The treated water quality is tested and the removal efficiency of the chemical oxygen demand, biochemical oxygen demand and total phosphorus can reach up to 88.3%, 84.5% and 79.2% respectively, which has a good urban sewage purification effect. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with specific embodiments.

[0038] The following raw materials in this application are all commercially available products, which are intended to fully disclose the raw materials in this application and should not be construed as limiting the sources of the raw materials. Specifically:

[0039] Iron oxide, content 99%; aluminum oxide, content 99%; calcium oxide, content 98%; silicon dioxide, content 98%; tourmaline powder, content 98%; carbon material powder is activated carbon powder, content 99%; binder is silica sol, effective ingredient content 30%; titanium dioxide, effective ingredient content 99%; coal powder is fly ash, content 99%; biomass powder is rice straw powder.

[0040] Example 1

[0041] The aquatic plant planting matrix filler of Example 1 is prepared by the following preparation method:

[0042] According to the dosage in Table 1, the planting matrix blank raw materials are mixed and stirred evenly, placed in a pressing device and pressed into a planting matrix blank with evenly distributed holes, and then placed in a refractory container. After firing at 650°C for 80 hours and naturally cooling, an aquatic plant planting matrix filler is obtained, wherein the average fineness of the planting matrix blank raw materials is 170 meshes.

[0043] Embodiment 2-5

[0044] The preparation method of the aquatic plant planting matrix filler of Examples 2-5 is the same as that of Example 1, except that the raw material dosage is different, as shown in Table 1 for details.

[0045] Table 1 Amount of raw material for aquatic plant planting matrix filler in Example 1-5 (kg)

[0046]

[0047] Example 6

[0048] The preparation method of the aquatic plant planting matrix filler in Example 6 is the same as that in Example 3, except that a sealing step is performed before firing the planting matrix blank; wherein, the sealing is performed by spreading a mixture of coal powder and biomass powder in the middle of each planting matrix blank layer, and the weight ratio of coal powder to biomass powder is 1:0.1.

[0049] Embodiment 7-8

[0050] The preparation method of the aquatic plant planting matrix filler of Examples 7-8 is the same as that of Example 3, except that the weight ratios of coal powder and biomass powder are different, which are 1:0.2 and 1:1 respectively.

[0051] Example 9

[0052] The preparation method of the aquatic plant planting matrix filler of Example 9 is the same as that of Example 3, except that the firing temperature is 700° C. and the firing time is 75 hours.

[0053] Example 10

[0054] The preparation method of the aquatic plant planting matrix filler of Example 10 is the same as that of Example 3, except that the firing temperature is 1600° C. and the firing time is 48 hours.

[0055] Examples 11-12

[0056] The preparation method of the aquatic plant planting matrix filler of Examples 11-12 is the same as that of Example 3, except that the fineness of the planting matrix blank raw materials is different, namely 180 mesh and 200 mesh, respectively.

[0057] Comparative Example 1

[0058] The preparation method of the aquatic plant planting matrix filler in Comparative Example 1 is the same as that in Example 1, except that the iron oxide in the raw material is replaced by an equal amount of aluminum oxide, and the other raw materials and dosages are the same as those in Example 1.

[0059] Comparative Example 2

[0060] The preparation method of the aquatic plant planting matrix filler in Comparative Example 2 is the same as that in Example 1, except that the aluminum oxide in the raw material is replaced by an equal amount of iron oxide, and the other raw materials and dosages are the same as those in Example 1.

[0061] Comparative Example 3

[0062] The preparation method of the aquatic plant planting matrix filler in Comparative Example 3 is the same as that in Example 1, except that the calcium oxide in the raw material is replaced by an equal amount of iron oxide, and the other raw materials and dosages are the same as those in Example 1.

[0063] Comparative Example 4

[0064] The preparation method of the aquatic plant planting matrix filler in Comparative Example 4 is the same as that in Example 1, except that the aluminum oxide and calcium oxide in the raw materials are replaced by equal amounts of iron oxide, and the other raw materials and dosages are the same as those in Example 1.

[0065] Comparative Example 5

[0066] The preparation method of the aquatic plant planting matrix filler in Comparative Example 5 is the same as that in Example 1, except that the aluminum oxide and iron oxide in the raw materials are replaced by calcium oxide in equal amounts, and the other raw materials and dosages are the same as those in Example 1.

[0067] Comparative Example 6

[0068] The preparation method of the aquatic plant planting matrix filler in Comparative Example 6 is the same as that in Example 1, except that the calcium oxide and iron oxide in the raw materials are replaced by equal amounts of aluminum oxide, and the other raw materials and dosages are the same as those in Example 1.

[0069] Application Example 1

[0070] Application Example 1 The method of using aquatic plant planting matrix filler in urban sewage treatment is:

[0071] When using the aquatic plant planting matrix filler prepared in Example 1, mix them evenly according to the weight ratio of matrix filler: natural water: brown sugar = 1:0.3:0.006, and use them after 3 hours.

[0072] The aquatic plants were planted and fixed in the matrix filler, and placed in the O section of the A / O system for urban sewage treatment. After 3 hours, the aquatic plants such as reeds and loosestrife collected from the wild were planted in the matrix filler, and placed in the aerobic section of the A / O system for urban sewage treatment, and then began to be used.

[0073] Every 10 days, add 1000 kg of matrix filler and mix well, then spray it onto the matrix filler. After 2 hours, put the matrix filler planted with aquatic plants back into the O-stage aeration tank.

[0074] Application Example 2-12

[0075] The method of using the aquatic plant planting matrix filler of Application Example 2-12 in urban sewage treatment is the same, the difference is that the aquatic plant planting matrix filler is the aquatic plant planting matrix filler prepared in Example 2-12.

[0076] Application Comparative Examples 1-6

[0077] The method of using the aquatic plant planting matrix filler of Comparative Examples 1-6 in urban sewage treatment is the same, except that the aquatic plant planting matrix filler is the aquatic plant planting matrix filler prepared in Comparative Examples 1-6.

[0078] Performance Testing

[0079] The water quality obtained from different application examples 1-12 and application comparison examples 1-6 was tested using the method and standard test of GB 18918-2002 "Pollutant Emission Standard for Urban Wastewater Treatment Plants". The test results are shown in Table 2.

[0080] Table 2 Test results of different water qualities

[0081]

[0082] The test results in Table 2 show that after the aquatic plant planting matrix filler obtained in the present application is applied to urban sewage treatment, the treated water quality is tested, and the removal efficiency of chemical oxygen demand, biochemical oxygen demand and total phosphorus can reach up to 88.3%, 84.5% and 79.2% respectively, which has a good urban sewage purification effect.

[0083] In Application Examples 1-5, the water quality tests of Application Examples 2-4 showed that the removal efficiency of chemical oxygen demand, biochemical oxygen demand and total phosphorus were higher than those of Application Examples 1 and 5, indicating that when the raw materials of the planting matrix blank are 25-35 parts of iron oxide, 15-25 parts of aluminum oxide, 4-8 parts of calcium oxide, 9-11 parts of silicon dioxide, 4-6 parts of tourmaline powder, 30-40 parts of carbon material powder, 1.0-1.4 parts of binder, 25-35 parts of water, and 0.4-0.6 parts of titanium dioxide, it is more suitable and improves the purification effect of urban sewage. This may be related to further regulating the dosage of each raw material of the aquatic plant planting matrix filler, which can make the various components cooperate better.

[0084] In Application Example 1 and Application Examples 6-8, the water quality test of Application Examples 7-8 showed that the removal efficiency of chemical oxygen demand, biochemical oxygen demand and total phosphorus was higher than that of Application Example 1 and Application Example 6, indicating that a sealing step was performed before firing the planting matrix blank; wherein, the sealing was performed by spreading a mixture of coal powder and biomass powder in the gaps between the planting matrix blank layers, and the weight ratio of the coal powder and the biomass powder was adjusted to 1: (0.2-1), which was more appropriate, thereby improving the purification effect of urban sewage, which may be related to the sealing step before firing the planting matrix blank; wherein, the sealing was performed by spreading a mixture of coal powder and biomass powder in the middle of each planting matrix blank layer, and the weight ratio of the coal powder and the biomass powder was adjusted, which could improve the sintering efficiency and quality of the filler.

[0085] In Application Example 1 and Application Examples 9-10, the water quality test of Application Example 9-10 showed that the removal efficiency of chemical oxygen demand, biochemical oxygen demand and total phosphorus was higher than that of Application Example 1, indicating that the firing temperature of the planting matrix blank is more suitable when it is 700-1600℃ and the time is 48-75 hours, which improves the purification effect of urban sewage. This may be related to adjusting the firing temperature of the planting matrix blank to 700-1600℃ and the time to 48-75 hours, which is beneficial to the sintering of the filler and the healthy growth of aquatic plants.

[0086] In Application Example 1 and Application Examples 11-12, the water quality test of Application Example 11-12 showed that the removal efficiency of chemical oxygen demand, biochemical oxygen demand and total phosphorus was higher than that of Application Example 1, indicating that the fineness of the planting matrix blank raw material is more suitable when it is 180-200 mesh, which improves the purification effect of urban sewage. This may be related to adjusting the fineness of the planting matrix blank raw material to 180-200 mesh, which is beneficial to the sintering of the filler and the healthy growth of aquatic plants.

[0087] In addition, combining the various index data of water quality of application comparison examples 1-6 and application examples 1-12, it is found that the addition of 20-45 parts of iron oxide, 15-25 parts of aluminum oxide, and 2-10 parts of calcium oxide to the raw materials of aquatic plant planting matrix fillers in the present application can improve the purification effect of urban sewage to varying degrees.

[0088] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A matrix filler for growing aquatic plants, characterized in that: The raw materials include the following parts by weight: 20-45 parts of iron oxide, 15-25 parts of aluminum oxide, 2-10 parts of calcium oxide, 5-15 parts of silicon dioxide, 1-10 parts of tourmaline powder, 15-50 parts of carbon material powder, 0.5-2 parts of binder, 10-50 parts of water, and 0.1-1 parts of titanium dioxide; The above raw materials are mixed, pressed into a planting matrix blank and distributed with holes, fired, and then naturally cooled to obtain the planting matrix blank; the planting matrix blank also includes a sealing step before firing; the sealing step is: a mixture of coal powder and biomass powder is spread in the gap between the planting matrix blank layers; In the mixture of coal powder and biomass powder, the weight ratio of coal powder to biomass powder is 1:(0.2-1); the firing temperature is 700-1600° C. and the firing time is 48-75 hours; The fineness of the planting matrix raw material is 180-200 mesh; The coal powder is made of fly ash with a content of 99%; the biomass powder is made of rice straw powder.

2. The aquatic plant planting matrix filler according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 25-35 parts of iron oxide, 15-25 parts of aluminum oxide, 4-8 parts of calcium oxide, 9-11 parts of silicon dioxide, 4-6 parts of tourmaline powder, 30-40 parts of carbon material powder, 1.0-1.4 parts of binder, 25-35 parts of water and 0.4-0.6 parts of titanium dioxide.

3. A method for preparing the aquatic plant planting matrix filler according to claim 1 or 2, characterized in that: The above raw materials are mixed, pressed into a planting matrix blank and provided with holes, fired, and then cooled naturally.

4. Use of the aquatic plant planting matrix filler as claimed in claim 1 or 2 in urban sewage treatment.

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