Gradually-dissolved phosphorus removal block and phosphorus removal method

Abstract

According to the scheme, zeolite powder, diatomaceous earth, phosphorus-accumulating bacteria, nutritional auxiliaries and the like are bonded and fixed into blocks through PVA, phosphorus is adsorbed through the zeolite powder and the diatomaceous earth, phosphorus is absorbed through the phosphorus-accumulating bacteria, the PVA has the hydrolysis characteristic, under washing of water flow, the phosphorus removal blocks fall off layer by layer from the outermost layer, and the phosphorus removal effect is improved. Phosphorus-containing wastewater is continuously treated with a new layer, and the efficient adsorption and removal efficiency of phosphorus is always kept.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphorus removal, and particularly to a gradually soluble phosphorus removal block and a phosphorus removal method. Background Art

[0002] High phosphorus content in water bodies easily causes eutrophication of water bodies, and then causes major environmental problems. Therefore, measures need to be taken to reduce the phosphorus content in water bodies. Currently, common methods include preparing adsorptive phosphorus removal particles and then spreading them into rivers and lakes. However, phosphorus removal particles and the like in water bodies will quickly sink to the bottom, greatly reducing the phosphorus removal effect. If made into blocks with materials that cannot be hydrolyzed, they are easily attached by microorganisms such as filamentous bacteria, yeasts, and molds, as well as algae, hindering the adsorption of phosphorus elements and other substances, resulting in poor phosphorus removal effect and the need for improvement. Summary of the Invention

[0003] To solve the above at least one technical defect, the present invention provides the following technical solutions:

[0004] This application document discloses a gradually soluble phosphorus removal block, which includes a PVA-based binder, zeolite powder, diatomaceous earth, polyphosphate-accumulating organisms, and a nutrient aid for supplying the carbon source required for the growth of polyphosphate-accumulating organisms. The mass ratio of the solvent, PVA-based binder, zeolite powder, diatomaceous earth, polyphosphate-accumulating organisms, nutrient aid for supplying the carbon source required for the growth of polyphosphate-accumulating organisms, and solvent and other materials is 2 - 5:28 - 36:28 - 36:0.05 - 0.15:1 - 3:800 - 1000.

[0005] In this solution, PVA is used to bond and fix zeolite powder, diatomaceous earth, polyphosphate-accumulating organisms, nutrient aid, etc. into a block. Zeolite powder and diatomaceous earth are used to adsorb phosphorus, and polyphosphate-accumulating organisms are used to absorb phosphorus. Moreover, PVA has hydrolysis characteristics. Under the scouring of water flow, the phosphorus removal block peels off layer by layer from the outermost layer, constantly presenting new surfaces to the phosphorus-containing wastewater, and always maintaining a high efficiency of phosphorus adsorption and removal.

[0006] Further, the PVA-based binder includes PVA1788 and PVA1799, and the mass ratio of PVA1788 to PVA1799 is 1:2 - 4, so that the hydrolysis characteristics are in a suitable state, and then it peels off in layers under the impact of water flow.

[0007] Further, the mass ratio of PVA1788 to PVA1799 is 1:3.

[0008] Further, the solvent is one or more of water and alcohol, and if the alcohol is glycerol, etc.

[0009] Further, the solvent includes water and alcohol, and the dosage of the alcohol is 4 - 6% of the binder, and preferably the dosage of the alcohol is 7.0% of the binder.

[0010] Further, the zeolite powder is of the alkali solution activation type. The zeolite powder is immersed in an alkali solution for soaking, and after solid-liquid separation, it is dried to form activated zeolite powder. The alkali solution is, for example, caustic soda.

[0011] Further, the nutrient additive is brown sugar. Each gram of the polyphosphate-accumulating bacteria contains 26 million to 35 million. Molasses is used as one of the carbon sources for the polyphosphate-accumulating bacteria, and other nitrogen sources, phosphorus sources, etc. can be supplied by the natural water body where they are located.

[0012] Further, the PVA-type binder and the solvent are premixed and heated for cross-linking reaction. The nutrient additive is added to the cross-linked PVA-type binder, and then zeolite powder, diatomaceous earth, and polyphosphate-accumulating bacteria are added. After curing, a phosphorus-removing block is formed, and the forming process is simple and easy to operate.

[0013] This application document discloses a phosphorus-removing method. The above-mentioned phosphorus-removing block is added to the phosphorus-containing wastewater. For example, the phosphorus-removing block is directly placed into rivers, lakes, etc. Preferably, the phosphorus-removing block is suspended in rivers, lakes, etc., which can improve the phosphorus-removing efficiency.

[0014] Further, according to the adsorption rate formula: X = KC 1 / n , the phosphorus-removing block is added to the phosphorus-containing wastewater, where K is 0.494, 1 / n is 0.899, and C is the weight of the phosphorus-removing block. By using the adsorption rate formula, a predetermined weight of the phosphorus-removing block can be accurately added, thereby reducing the phosphorus content in the corresponding water body area to a predetermined standard, making it more convenient to use.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The present invention designs a gradually soluble phosphorus-removing block, which can be hydrolyzed layer by layer during the phosphorus-removing process in water, and always maintains a high efficiency of adsorbing and removing phosphorus. The adsorption rate formula of the phosphorus-removing block is designed, and the phosphorus content in the predetermined water body can be reduced to the predetermined standard by accurately adding the phosphorus-removing block. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of this test device;

[0019] Figure 2 It is a dissolution curve diagram of the phosphorus-removing block;

[0020] Figure 3 It is a curve diagram of the adsorption and removal rate of phosphorus;

[0021] Figure 4It is a schematic structural diagram of the phosphorus removal block in use;

[0022] Among them, the reference numerals are:

[0023] 1. Water tank; 2. Phosphorus removal block; 3. Oxygen supply machine; 4. Water pump; 5. Floating ball; 6. Connecting rope; 7. Tray; 8. Cement weight. Specific implementation mode

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiment 1

[0026] The preparation of the gradually dissolving phosphorus removal block is as follows:

[0027] Mix PVA1788 and PVA179 in a mass ratio of 1:3 and stir evenly to form a PVA-type binder. Mix deionized water and glycerol to form a solvent, where the dosage of glycerol is 5% of the PVA-type binder. Mix the PVA-type binder with the solvent and stir evenly, and raise the temperature to 80°C and react for 1 h.

[0028] Add brown sugar (nutritional adjuvant) to the reaction mixture of the PVA-type binder and the solvent and stir evenly. Then, add polyphosphate-accumulating bacteria (Aeromonas hydrophila, 30 million per gram), zeolite powder (activated by soaking in caustic soda), and diatomaceous earth in sequence. After stirring evenly, inject the mixture into a mold. After it solidifies, take out the formed square block, which is the phosphorus removal block.

[0029] Among them, the mass ratio of the PVA-type binder, zeolite powder, diatomaceous earth, polyphosphate-accumulating bacteria, nutritional adjuvant for supplying the carbon source required for the growth of polyphosphate-accumulating bacteria, and solvent is 4:33:33:0.001:2:900.

[0030] Embodiment 2

[0031] The preparation of the gradually dissolving phosphorus removal block is as follows:

[0032] Mix PVA1788 and PVA179 in a mass ratio of 1:2.5 and stir evenly to form a PVA-type binder. Mix deionized water and glycerol to form a solvent, where the dosage of glycerol is 4% of the PVA-type binder. Mix the PVA-type binder with the solvent and stir evenly, and raise the temperature to 80°C and react for 1 h.

[0033] Add brown sugar (nutritional adjuvant) to the reaction mixture of the PVA-type binder and the solvent and stir evenly. Then, add polyphosphate-accumulating bacteria (Aeromonas hydrophila, 30 million per gram), zeolite powder (activated by soaking in caustic soda), and diatomaceous earth in sequence. After stirring evenly, inject the mixture into a mold. After it solidifies, take out the formed square block, which is the phosphorus removal block.

[0034] The mass ratio of the PVA-based binder, zeolite powder, diatomaceous earth, polyphosphate-accumulating bacteria, nutrient aid for supplying the carbon source required for the growth of polyphosphate-accumulating bacteria, and solvent is 4:34:34:0.0015:2:850.

[0035] Example 3

[0036] The preparation of the gradually soluble phosphorus-removing block is as follows:

[0037] Mix PVA1788 and PVA179 in a mass ratio of 1:4 and stir evenly to form a PVA-based binder. Mix deionized water and glycerol to form a solvent, where the dosage of glycerol is 5.5% of the PVA-based binder. Mix the PVA-based binder and the solvent and stir evenly, then raise the temperature to 80 °C and react for 1 h.

[0038] Add brown sugar (nutrient aid) to the mixed solution of the PVA-based binder and the solvent after the reaction and stir evenly. Then, add polyphosphate-accumulating bacteria (Aeromonas hydrophila, 30 million per gram), zeolite powder (activated by soaking in caustic soda), and diatomaceous earth in sequence. After stirring evenly, inject the mixture into a mold. After it solidifies, take out the formed square block, which is the phosphorus-removing block.

[0039] The mass ratio of the PVA-based binder, zeolite powder, diatomaceous earth, polyphosphate-accumulating bacteria, nutrient aid for supplying the carbon source required for the growth of polyphosphate-accumulating bacteria, and solvent is 4.6:32:34:0.001:2:910.

[0040] Each phosphorus-removing block prepared in the above examples weighs about 1383 g and has a porosity of 0.2 - 0.8. To detect the performance of the phosphorus-removing block, our company designed an experimental device as Figure 1 shown. Three water tanks 1 are distributed in a stepped manner and are connected in sequence. A water pump 4 is used to connect the water tank at the lower position and the water tank at the higher position to form circulating water. An oxygen supply machine 3 supplies oxygen to the water tank at the higher position 1 (the dissolved oxygen is maintained at 3 mg / L). When the phosphorus content in the raw water is 2.05 ppm, the average water temperature is 11.6 °C, and the simulated flow rate is 700 ml / min, place the phosphorus-removing block prepared in Example 1 in the middle water tank, specifically as Figure 4 shown. Place the prepared phosphorus-removing block 2 on the tray 7, and then connect the phosphorus-removing blocks 2 in series with a connecting rope 6. The upper end of the uppermost phosphorus-removing block is connected to the upper floating ball 5, and the lower end of the lowermost phosphorus-removing block is connected to the lower cement weight 8. The phosphorus-removing block is suspended in the water tank and completely immersed under the water surface. After the circulating water test, the dissolution amount of the phosphorus-removing block is as Figure 2 shown. In the figure, the ordinate represents the dissolution amount (g), and the abscissa represents the time number.

[0041] From Figure 2 it can be seen that the dissolution of the phosphorus-removing block is basically in an increasing state. With the impact of the water flow, the phosphorus-removing block continuously falls off, and finally only the tray and the connecting rope remain.

[0042] During the test, the removal rate of phosphorus content in water is as Figure 3 shown. In the first 2 days, the phosphorus in the water body is adsorbed by the porous materials, and about 55% of the materials in diatomite and zeolite powder play the adsorption function. Therefore, the adsorption capacity is the highest in the first 2 days, and its adsorption removal rate is 3.69‰ after conversion. As the materials are gradually peeled off after adsorption saturation, the subsequent adsorption capacity is greatly reduced. When the phosphorus removal block is completely dissolved, the adsorption removal rate of the phosphorus removal block to phosphorus is measured to be 4.2‰.

[0043] Through statistics and calculation, the formula for the adsorption removal rate of phosphorus by this phosphorus removal block is: X = KC 1 / n , where K is 0.494, 1 / n is 0.899, and C is the weight of the phosphorus removal block. For example, in the use in the river, the benchmark dosage is 1%, that is, 10 - 15 kg of phosphorus removal modules are used in 1 m 3 of water body (10 - 15 kg are arranged in one ton of water body. From the perspective of adsorption capacity, for every 4.2 kg of total phosphorus removed, 1000 kg of phosphorus removal blocks need to be added). The elimination amounts of different pollution concentration loads can be calculated by the above formula, that is, the higher the pollution load, the more amount needs to be invested.

[0044] Through the above formula, the phosphorus removal blocks of a predetermined weight can be accurately put in, and then the phosphorus in the predetermined water body can be reduced to the required standard.

[0045] In addition, through calculation, the cost per ton of this phosphorus removal block is about 3990 yuan, with low cost and suitable for large-scale use.

[0046] The above is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. Gradually dissolving phosphorus removal block, characterized in that: The invention comprises a PVA type binder, zeolite powder, diatomaceous earth, polyphosphate bacteria, a nutrient additive for supplying a carbon source required for the growth of polyphosphate bacteria, and a solvent. The mass ratio of the PVA type binder, zeolite powder, diatomaceous earth, polyphosphate bacteria, a nutrient additive for supplying a carbon source required for the growth of polyphosphate bacteria, and the solvent is 2-5: 28-36: 28-36: 0.05-0.15: 1-3: 800-1000.

2. The gradually dissolving phosphorus removal block according to claim 1, characterized in that: The PVA type adhesive includes PVA1788 and PVA1799, and the mass ratio of PVA1788 to PVA1799 is 1:2-4.

3. The gradually dissolving phosphorus removal block according to claim 2, characterized in that: The mass ratio of PVA1788 to PVA1799 is 1:

3.

4. The gradually dissolving phosphorus removal block according to claim 1, characterized in that: The solvent is one or more of water and alcohol.

5. The gradually dissolving phosphorus removal block according to claim 4, characterized in that: The solvent includes water and alcohol, and the amount of the alcohol is 6.5-7.2% of the binder.

6. The gradually dissolving phosphorus removal block according to claim 4, characterized in that: The zeolite powder is an alkali-activated type. The zeolite powder is immersed in the alkali solution for 2 hours, and then dried after solid-liquid separation to form the activated zeolite powder.

7. The gradually dissolving phosphorus removal block according to claim 4, characterized in that: The nutritional additive is brown sugar, and the polyphosphate bacteria contains 26 to 35 million per gram.

8. The gradually dissolving phosphorus removal block according to claim 1, characterized in that: The PVA type binder and the solvent are premixed and heated to undergo a cross-linking reaction, the nutritional additive is added to the cross-linked PVA type binder, and then added to the zeolite powder, diatomaceous earth, polyphosphate bacteria, and brown sugar mixture to form a dephosphorization block after solidification.

9. A phosphorus removal method, characterized in that: The phosphorus removal block according to any one of claims 1 to 8 is added into phosphorus-containing wastewater.

10. The phosphorus removal method according to claim 9, characterized in that: According to the adsorption rate formula: X = KC 1 / n , add dephosphorization block to the phosphorus-containing wastewater, where K is 0.494, 1 / n is 0.899, and C is the weight of the dephosphorization block.

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