MET ecological material integrated equipment

Abstract

The invention discloses MET ecological material integrated equipment which comprises a pretreatment mechanism, a phosphorus removal and precipitation mechanism, a sludge concentration and transfer mechanism, a phosphorus resource recycling mechanism and a tail water and by-product treatment mechanism. The phosphorus removal precipitation mechanism is used for converting dissolved phosphorus into solid precipitates and discharging sludge with the solid precipitates, the sludge concentration mechanism is used for concentrating the discharged sludge and conveying the sludge to the phosphorus resource recycling mechanism, and the phosphorus resource recycling mechanism is used for separating phosphorus ions from the concentrated sludge. The tail water and byproduct treatment mechanism is used for deeply purifying the tail water and recycling byproducts after pickling and regenerating the byproducts.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, specifically to an integrated MET eco-material device. Background Technology

[0002] With the tightening of phosphorus emission limits in the Water Pollution Prevention and Control Action Plan (TP≤0.3mg / L) and the urgent need for resource recycling under the "dual-carbon" strategy, the transformation of wastewater phosphorus recovery from end-of-pipe treatment to resource regeneration has become an industry consensus. However, existing technologies suffer from systemic deficiencies in terms of equipment integration, recovery efficiency, and economic viability.

[0003] 1) Fragmented process - Traditional phosphorus removal requires multiple independent equipment such as pretreatment, chemical precipitation, sludge dewatering, and phosphorus extraction, which are complex, occupy a large area, and have high operating costs;

[0004] 2) Low phosphorus recovery rate - The sludge produced by conventional chemical precipitation methods contains heavy metal impurities, and direct landfilling leads to a waste of phosphorus resources. Existing phosphorus extraction technologies (such as struvite crystallization) have high requirements for sludge purity, making them difficult to apply industrially.

[0005] 3) Sedimentation and secondary pollution - The sludge discharge pipes of the sedimentation tank are prone to blockage and require frequent maintenance; iron / aluminum salt waste liquid is generated during the acid hydrolysis and recovery of phosphorus, and improper disposal will cause secondary pollution;

[0006] 4) Low product value - Recovered phosphorus is mostly in the form of low-purity phosphate, lacking high-value utilization pathways. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated MET eco-material device to solve the above-mentioned problems.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A MET integrated ecological material equipment includes a pretreatment unit, a phosphorus removal and precipitation unit, a sludge thickening and transfer unit, a phosphorus resource recovery unit, and a wastewater and by-product treatment unit. The pretreatment unit is used to remove large particulate suspended impurities and adjust the pH value. The phosphorus removal and precipitation unit is used to convert dissolved phosphorus into solid precipitate and discharge sludge with solid precipitate. The sludge thickening unit is used to thicken the discharged sludge and transport it to the phosphorus resource recovery unit. The phosphorus resource recovery unit is used to separate phosphorus ions from the thickened sludge and perform crystallization, drying, and sieving to obtain slow-release phosphate fertilizer-grade particles. The wastewater and by-product treatment unit is used to deeply purify the wastewater and regenerate the by-products through acid washing for recycling.

[0010] Preferably, the pretreatment mechanism includes an interception tank, a pH adjustment tank, and a metal salt dosing tank connected in sequence. The interception tank has several sets of interception grids arranged along its height to intercept large suspended particles in the wastewater, with the grid spacing decreasing in a stepped manner from top to bottom. The tank wall has an inlet and an outlet located above and below the interception grids, respectively. The pH adjustment tank is equipped with a pH probe and a first metering pump closed-loop control module to control the dosage of H2SO4 or NaOH. The pH probe, in conjunction with the metering pump, stabilizes the pH between 4.5 and 7.0, preventing excessive acidity / alkalinity and reagent loss. The metal salt dosing tank is equipped with a first metering pump closed-loop control module to control the dosage of FeCl3 or Al2(SO4)3, ensuring adequate PO4 in the wastewater. 3 -Complete precipitation.

[0011] Preferably, the phosphorus removal precipitation mechanism includes a precipitation chamber, wherein the precipitation is carried out by Fe... 3+ Dissolved PO4 3 - Transformed into solid precipitate, the outlet end of the sedimentation chamber is equipped with an annular porous sludge discharge network for dynamic anti-sludge discharge. The annular porous sludge discharge network is a UPVC porous pipe with radial distribution at the bottom. The end of the annular porous sludge discharge network is equipped with a self-cleaning pump suction interface. The pump suction port of the self-cleaning pump suction interface is equipped with a rotating scraper for scraping material and a backwashing interface.

[0012] Preferably, the UPVC porous tube has a pore diameter of 3-5 mm, a spacing of 30 cm, and an inclination angle of 5°.

[0013] Preferably, the sludge thickening and transfer mechanism includes a hydrocyclone separator, a sludge buffer tank, and a screw conveyor connected in sequence. The hydrocyclone separator rapidly separates high-solids sludge based on three-phase separation enhancement. The sludge buffer tank is used to temporarily store sludge and maintain its flow state by slow stirring. The screw conveyor quantitatively transports sludge to the phosphorus resource recovery mechanism through a nitrogen-sealed method.

[0014] Preferably, the phosphorus resource recovery mechanism includes an acid hydrolysis reaction chamber, an ion adsorption chamber, and a crystallization drying chamber. The acid hydrolysis reaction chamber is equipped with an upper radial turbine and a lower axial impeller to form a double-layer stirring to dissociate phosphorus into the liquid phase. The ion adsorption chamber is equipped with a lanthanum-loaded resin adsorption column for separating phosphorus from heavy metal ions. The crystallization drying chamber performs gradient crystallization drying on the separated phosphorus salts and controls the crystal particle size.

[0015] Preferably, the wastewater and by-product treatment unit includes an ultraviolet disinfection chamber, a metal recovery chamber, and a filter press dewatering chamber. The ultraviolet disinfection chamber is used to disinfect the wastewater with ultraviolet light, and the metal recovery chamber is used to remove Fe from the acid hydrolysate. 3The recycled material is transported to the phosphorus removal and precipitation unit for phosphorus removal and precipitation. The filter press dewatering chamber uses a plate and frame filter press to dewater and generate building material raw materials.

[0016] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] 1. This invention is an integrated MET ecological material equipment. Through the coordinated operation of a five-stage structure, including pretreatment, phosphorus removal precipitation, sludge thickening, phosphorus recovery, and treatment of effluent and by-products, it eradicates siltation through a dynamically anti-clogging annular porous sludge discharge pipe network and a self-cleaning pump suction interface. The lanthanum-loaded resin adsorption column and gradient crystallization produce slow-release phosphate fertilizer particles, improving the phosphorus precipitation rate and phosphorus recovery rate. It breaks through the dilemma of "phosphorus removal waste residue and resource loss" in traditional sewage treatment plants with a single-system closed loop, forming a sustainable ecological chain of "pollution treatment-fertilizer production-efficiency enhancement".

[0018] 2. This invention provides an integrated MET eco-material equipment that removes Fe from the acid hydrolysis solution. 3+ Metals are recycled in the metal recovery chamber and reused in the precipitation process, reducing the cost of using metal salts.

[0019] 3. The present invention is an integrated MET ecological material equipment, in which the effluent is deeply purified by ultraviolet disinfection chamber, and the acid washing residue is dewatered by plate and frame filter press to generate building material raw materials, realizing 100% resource utilization of sludge, promoting resource recycling and near-zero emissions. Attached Figure Description

[0020] Figure 1 This is a structural block diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the pretreatment mechanism of the present invention;

[0022] Figure 3 This is a schematic diagram of the phosphorus removal precipitation mechanism of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] It should be noted that in this invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element of this invention must have a specific orientation, and therefore should not be construed as a limitation of this invention.

[0025] Example

[0026] Please refer to Figures 1 to 3 As shown, this invention discloses an integrated MET ecological material equipment, including a pretreatment unit, a phosphorus removal and precipitation unit, a sludge thickening and transfer unit, a phosphorus resource recovery unit, and a wastewater and by-product treatment unit. The pretreatment unit is used to remove large particulate suspended impurities and adjust the pH value. The phosphorus removal and precipitation unit is used to convert dissolved phosphorus into solid precipitate and discharge sludge with solid precipitate. The sludge thickening unit is used to thicken the discharged sludge and transport it to the phosphorus resource recovery unit. The phosphorus resource recovery unit is used to separate phosphorus ions from the thickened sludge and perform crystallization, drying, and sieving to obtain slow-release phosphate fertilizer-grade particles. The wastewater and by-product treatment unit is used to deeply purify the wastewater and regenerate the by-products through acid washing for recycling.

[0027] The pretreatment unit includes an interception tank 11, a pH adjustment tank 12, and a metal salt dosing tank 13, which are connected in sequence. The interception tank 11 has several sets of interception grids 111 arranged along its height to intercept large suspended particles in the wastewater. The spacing between the grids in each set of interception grids 111 decreases in a stepped manner from top to bottom. The tank wall of the interception tank 11 has an inlet and an outlet located above and below the interception grids 111, respectively. The pH adjustment tank 12 is equipped with a pH probe 121 and a first metering pump closed-loop control module 122 to control the dosage of H2SO4 or NaOH and stabilize the wastewater pH to 4.5-7.0. The metal salt dosing tank 13 is equipped with a first metering pump closed-loop control module 131 to control the dosage of FeCl3 or Al2(SO4)3 to ensure the concentration of PO4 in the wastewater. 3 -Complete precipitation.

[0028] The phosphorus removal precipitation mechanism includes a precipitation chamber 21, which is precipitated by Fe 34 Dissolved PO4 3 - Transformed into solid precipitate, the outlet end of the sedimentation chamber 21 is equipped with an annular porous sludge discharge network 22 for dynamic anti-sludge discharge. The annular porous sludge discharge network 22 is a UPVC porous pipe with radial distribution at the bottom. The end of the annular porous sludge discharge network is equipped with a self-cleaning pump suction interface. The pump suction port of the self-cleaning pump suction interface 56 is equipped with a rotating scraper 24 for scraping. The gap between the rotating scraper 24 and the pipe wall is 0.5mm. The rotation range covers the entire flange interface area to prevent sludge accumulation at the interface. It is also equipped with a backwash interface. The backwash interface adopts a quick-connect G3 / 8 threaded interface and is directly connected to the external high-pressure water pipe.

[0029] UPVC porous pipes have a pore diameter of 3-5mm, a spacing of 30cm, and an inclination angle of 5°. The radial UPVC pipes adopt a variable diameter design (inlet DN150 → end DN80), which, combined with the 5° inclination angle, forms a gravity-negative pressure dual drive.

[0030] The sludge thickening and transfer mechanism includes a hydrocyclone separator 31, a sludge buffer tank 32, and a screw conveyor 33 connected in sequence. The hydrocyclone separator 31 rapidly separates high-solids sludge based on three-phase separation enhancement. The sludge buffer tank 32 is used to temporarily store sludge and maintain its flow state by slow stirring. The screw conveyor 33 quantitatively transports the sludge to the phosphorus resource recovery mechanism through a nitrogen-sealed method.

[0031] The phosphorus resource recovery mechanism includes an acid hydrolysis reaction chamber 41, an ion adsorption chamber 42, and a crystallization drying chamber 43. The acid hydrolysis reaction chamber 41 is equipped with an upper radial turbine and a lower axial impeller to form a double-layer stirring to dissociate phosphorus into the liquid phase. The ion adsorption chamber 42 is equipped with a lanthanum-loaded resin adsorption column to separate phosphorus from heavy metal ions. The crystallization drying chamber 43 performs gradient crystallization drying on the separated phosphorus salts and controls the crystal particle size.

[0032] The wastewater and by-product treatment facility includes an ultraviolet disinfection chamber 51, a metal recovery chamber 52, and a filter press dewatering chamber 53. The ultraviolet disinfection chamber 51 is used for ultraviolet disinfection of the wastewater, and the metal recovery chamber 52 is used for the removal of Fe from the acid hydrolysate. 3 The recycled material is transported to the phosphorus removal and precipitation unit 3 for phosphorus removal and precipitation. The filter press dewatering chamber 53 uses a plate and frame filter press to dewater and generate building material raw materials.

[0033] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated MET eco-material equipment, characterized in that: The system includes a pretreatment unit, a phosphorus removal and precipitation unit, a sludge thickening and transfer unit, a phosphorus resource recovery unit, and a wastewater and by-product treatment unit. The pretreatment unit is used to remove large particulate suspended impurities and adjust the pH value. The phosphorus removal and precipitation unit is used to convert dissolved phosphorus into solid precipitate and discharge sludge with solid precipitate. The sludge thickening unit is used to thicken the discharged sludge and transport it to the phosphorus resource recovery unit. The phosphorus resource recovery unit is used to separate phosphorus ions from the thickened sludge and perform crystallization, drying, and sieving to obtain slow-release phosphate fertilizer-grade granules. The wastewater and by-product treatment unit is used to deeply purify the wastewater and regenerate the by-products through acid washing for recycling.

2. The MET integrated eco-material equipment as described in claim 1, characterized in that: The pretreatment mechanism includes an interception tank, a pH adjustment tank, and a metal salt dosing tank connected in sequence. The interception tank has several sets of interception grids arranged along its height to intercept large suspended particles in the wastewater. The spacing between the grids in each set decreases in a stepped manner from top to bottom. The tank wall has an inlet and an outlet located above and below the interception grids, respectively. The pH adjustment tank is equipped with a pH probe and a first metering pump closed-loop control module to control the dosage of H2SO4 or NaOH and stabilize the wastewater pH to 4.5-7.

0. The metal salt dosing tank is equipped with a first metering pump closed-loop control module to control the dosage of FeCl3 or Al2(SO4)3 to ensure the presence of PO4 in the wastewater. 3 -Complete precipitation.

3. The MET eco-material integrated equipment as described in claim 1, characterized in that: The phosphorus removal precipitation mechanism includes a precipitation chamber, which is permeated with Fe 3+ Dissolved PO4 3 - Transformed into solid precipitate, the outlet end of the sedimentation chamber is equipped with an annular porous sludge discharge network for dynamic anti-sludge discharge. The annular porous sludge discharge network is a UPVC porous pipe with radial distribution at the bottom. The end of the annular porous sludge discharge network is equipped with a self-cleaning pump suction interface. The pump suction port of the self-cleaning pump suction interface is equipped with a rotating scraper for scraping material and a backwashing interface.

4. The MET integrated eco-material equipment as described in claim 3, characterized in that: The UPVC porous tube has a pore diameter of 3-5mm, a spacing of 30cm, and an inclination angle of 5°.

5. The MET integrated eco-material equipment as described in claim 1, characterized in that: The sludge thickening and transfer mechanism includes a hydrocyclone separator, a sludge buffer tank, and a screw conveyor connected in sequence. The hydrocyclone separator rapidly separates high-solids sludge based on three-phase separation enhancement. The sludge buffer tank is used to temporarily store sludge and maintain its flow state by slow stirring. The screw conveyor quantitatively transports sludge to the phosphorus resource recovery mechanism through a nitrogen-sealed method.

6. The MET integrated eco-material equipment as described in claim 1, characterized in that: The phosphorus resource recovery mechanism includes an acid hydrolysis reaction chamber, an ion adsorption chamber, and a crystallization drying chamber. The acid hydrolysis reaction chamber is equipped with an upper radial turbine and a lower axial impeller to form a double-layer stirring to dissociate phosphorus into the liquid phase. The ion adsorption chamber is equipped with a lanthanum-loaded resin adsorption column to separate phosphorus from heavy metal ions. The crystallization drying chamber performs gradient crystallization drying on the separated phosphorus salts and controls the crystal particle size.

7. The MET integrated eco-material equipment as described in claim 1, characterized in that: The wastewater and by-product treatment facility includes an ultraviolet disinfection chamber, a metal recovery chamber, and a filter press dewatering chamber. The ultraviolet disinfection chamber is used to disinfect the wastewater with ultraviolet light, and the metal recovery chamber is used to remove Fe from the acid hydrolysate. 3 The recycled material is transported to the phosphorus removal and precipitation unit for phosphorus removal and precipitation. The filter press dewatering chamber uses a plate and frame filter press to dewater and generate building material raw materials.

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