CN215855748U - Cooling magnesium ammonium phosphate reaction-conditioning thermokalite residual sludge mixed liquid equipment - Google Patents
Cooling magnesium ammonium phosphate reaction-conditioning thermokalite residual sludge mixed liquid equipment Download PDFInfo
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- CN215855748U CN215855748U CN202121005407.5U CN202121005407U CN215855748U CN 215855748 U CN215855748 U CN 215855748U CN 202121005407 U CN202121005407 U CN 202121005407U CN 215855748 U CN215855748 U CN 215855748U
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Abstract
The utility model discloses equipment for reacting and conditioning cooled magnesium ammonium phosphate with thermal alkaline hydrolysis of residual sludge mixed liquor. A cooling water jacket is arranged outside the reaction kettle; a stirrer is arranged on the reaction kettle; the stirrer is provided with stirring blades, the cooling water jacket wraps the reaction kettle, the lower part of the cooling water jacket is provided with a cooling circulation water inlet, and the upper part of the cooling water jacket is provided with a cooling circulation water outlet; the cooling circulation water outlet is connected with an external cooling tower, the cooling tower is connected with an external circulation water tank, the external circulation water tank is connected with a cooling circulation water pump, and the cooling circulation water pump is connected with a cooling circulation water inlet. The utility model combines the cooling water jacket and the reaction kettle into the equipment for mixing the residual sludge through thermal alkaline hydrolysis for cooling magnesium ammonium phosphate reaction and conditioning, thus not only leading the structure of the whole device to be compact, reducing the occupied area and the energy loss, but also avoiding a connecting pipe between a cooling area and the reaction kettle.
Description
Technical Field
The utility model relates to the technical field of excess sludge treatment equipment of urban sewage treatment plants, in particular to equipment for reacting and conditioning cooled magnesium ammonium phosphate for thermal alkaline hydrolysis of excess sludge mixed liquor.
Background
Nitrogen and phosphorus are main elements on which human beings live, and not only are important components of cells, but also play an extremely important role in the composition of genetic materials and the storage of biological energy (ATP and ADP), and are also necessary nutrient elements for plant growth. A large amount of nitrogen and phosphorus in the sewage are directly discharged into a natural water body, so that not only is a large amount of phosphorus lost, but also eutrophication of the water body is caused. In the secondary biochemical treatment system of urban sewage, more than 90% of the phosphorus and part of the nitrogen load in the inlet water can be transferred into the sludge. The sludge can release nitrogen and phosphorus in the treatment process, and if the sludge is refluxed, the nitrogen and phosphorus load of a sewage treatment plant can be increased, and the treatment efficiency of the nitrogen and the phosphorus can be reduced. Therefore, the nitrogen and the phosphorus in the sludge are recovered by adopting a proper method, so that the limited phosphorus resource can be recovered, the nitrogen and phosphorus load of the return flow of the sludge dewatering water is reduced, and the sludge can be subjected to reduction, harmless and resource treatment.
At present, nitrogen and phosphorus are removed and nitrogen is recovered from wastewaterOne of the phosphorus and ammonium magnesium phosphate (struvite) crystallization processes has the functions of removing nitrogen and phosphorus, and the recovered struvite product can be used as a fertilizer, and the struvite crystallization process is a research hotspot for removing nitrogen and phosphorus from domestic and foreign wastewater and recovering nitrogen and phosphorus from resources. Struvite is an excellent slow-release fertilizer, and the characteristic of being difficult to dissolve in water does not cause water eutrophication. Struvite chemical composition is magnesium ammonium phosphate hexahydrate (MgNH)4PO4·6H2O), MAP for short, is a white crystalline mineral with low solubility. As Mg in water2+、NH4 +And PO4 3-When the ion concentration exceeds the solubility limit, spontaneous crystallization occurs to produce struvite crystal precipitation, and the reaction formula is as follows: mg (magnesium)2++NH4 ++PO4 3-+6H2O→MgNH4PO4·6H2O ↓. The struvite crystallization method can recover nitrogen and phosphorus in sludge and sewage, has short reaction time, simple and convenient operation, easy control of reaction and wide application range, and thus has good application prospect in recovering nitrogen and phosphorus.
A thermal alkaline hydrolysis excess sludge mixed liquid equipment device for cooling magnesium ammonium phosphate reaction-conditioning is characterized in that after the thermal alkaline hydrolysis sludge mixed liquid is cooled, ammonia nitrogen and phosphate in the thermal alkaline hydrolysis sludge mixed liquid react with magnesium chloride to generate crystalline/amorphous magnesium ammonium phosphate (struvite) to recover nitrogen and phosphorus in the excess sludge, then the mixed liquid is conditioned to improve the separation performance of mud and water, the generated struvite can be used as slow release fertilizer, the struvite slow release fertilizer is fixed in a dehydrated mud cake, the fertilizer efficiency of the excess sludge is improved, the dehydrated mud cake can be directly used as a soil conditioner or nutrient soil, and the recycling effective utilization of nitrogen and phosphorus in the excess sludge of a municipal sewage treatment plant is realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide equipment for reducing temperature, reacting and conditioning magnesium ammonium phosphate and performing thermal alkaline hydrolysis on residual sludge mixed liquor.
In order to achieve the purpose, the utility model provides the following technical scheme:
a temperature reduction magnesium ammonium phosphate reaction-conditioned thermal alkaline hydrolysis residual sludge mixed liquid device is characterized in that a cooling water jacket is arranged outside a reaction kettle; a stirrer is arranged on the reaction kettle; the stirring machine is provided with stirring blades, and the medicament in the reaction kettle and the mixed liquid (hereinafter referred to as the mixed liquid) after thermal alkaline hydrolysis of sludge are fully mixed and reacted to condition the mixed liquid under stirring, so that the mud-water separation performance of the mixed liquid is improved, the reaction kettle is wrapped by the cooling water jacket, the cooling circulation water inlet is formed in the lower part of the reaction kettle, and the cooling circulation water outlet is formed in the upper part of the reaction kettle; the cooling circulation water outlet is connected with an external cooling tower, the cooling tower is connected with an external circulation water tank, the external circulation water tank is connected with a cooling circulation water pump, and the cooling circulation water pump is connected with a cooling circulation water inlet.
Further, the present invention also includes a bracket; the support is arranged on the outer wall surface of the reaction kettle.
Furthermore, the reaction kettle is provided with an air collecting port.
Furthermore, the utility model also comprises an observation port which is arranged on the reaction kettle. The observation port is convenient for observing the reaction process in the reaction kettle at any time.
Furthermore, the utility model also comprises a pH meter, wherein the pH meter is arranged on the reaction kettle, a probe of the pH meter extends into the reaction kettle, and a signal wire of the pH meter is connected with a Programmable Logic Controller (PLC), so that the pH value in the reaction kettle can be conveniently regulated and controlled.
Further, the utility model also comprises a thermometer, and the thermometer is arranged on the reaction kettle. The probe of the thermometer extends into the reaction kettle, and the signal wire of the thermometer is connected with the PLC, so that the temperature in the reaction kettle can be conveniently regulated and controlled.
Further, the utility model also comprises a sludge outlet which is arranged at the bottom of the reaction kettle. And the sludge outlet is used for discharging the conditioned mixed liquid.
Further, the utility model also comprises a sludge inlet which is arranged on the reaction kettle. The sludge inlet is filled with mixed liquid obtained after thermal alkaline hydrolysis of sludge.
Furthermore, the utility model isThe model also comprises a medicine adding port; the medicine feeding port is arranged on the reaction kettle. The medicament added from the medicament adding port comprises NH4Cl、MgCl2And polyacrylamide.
Further, the gas collection port is connected with the spray tower through a pipeline. The gas collecting port is used for collecting NH in the reaction kettle3And connected to a spray tower, NH3After passing through a spray tower, using NH3·H2The O form is recovered and reused for Magnesium Ammonium Phosphate (MAP) reaction.
The equipment for reducing the temperature, reacting and conditioning the magnesium ammonium phosphate and decomposing the residual sludge mixed liquid has the characteristics of simple and compact structure, small occupied area, investment saving, simple and convenient operation and high nitrogen and phosphorus recovery rate. The device of the utility model is newly designed in the following two aspects:
1. the cooling water interlayer and the reaction kettle are combined into a jacketed type equipment for reducing the temperature of the mixed liquid of the magnesium ammonium phosphate reaction and the conditioned thermal alkaline hydrolysis of the residual sludge, so that the structure of the whole device is compact, the floor area is reduced, and a connecting pipe between a cooling area and the reaction kettle can be omitted;
2. the utility model discloses a device is through decomposing mud cooling back with the thermokalite, wherein ammonia nitrogen and phosphate and magnesium chloride take place to react and generate nitrogen and phosphorus in the crystallization/amorphous form ammonium magnesium phosphate (struvite) recovery excess sludge, then take care of mixed liquid, improve mud-water separation performance, the struvite of formation can regard as slowly-releasing fertilizer, be fixed in the dewatered sludge cake with struvite slowly-releasing fertilizer, the fertilizer efficiency of excess sludge has been improved, make the dewatered sludge cake can directly be used as soil improvement agent or nutrient soil, nitrogen in the surplus sludge of town sewage treatment plant has been realized, the resourceful effective utilization of phosphorus.
Drawings
FIG. 1 is a schematic cross-sectional view of the apparatus of the present invention, and FIG. 2 is a top view of the apparatus of the present invention.
Description of the drawings: 1. the device comprises a reaction kettle, 2, a stirrer, 3, a sludge inlet, 4, a medicine feeding port, 5, an observation port, 6, a gas collecting port, 7, a pH meter, 8, a thermometer, 9, a PLC (programmable logic controller), 10, a support, 11, a stirrer blade, 12, a cooling water jacket, 13, a cooling circulation water inlet, 14, a sludge outlet, 15, a cooling circulation water outlet, 16, a spray tower, 17, a cooling tower, 18, a circulation water tank, 19 and a cooling circulation water pump.
Detailed Description
The technical scheme of the utility model is described in detail by combining the attached drawing, and the equipment for the mixed liquid of the residual sludge of the thermal alkaline hydrolysis for reducing the temperature of the magnesium ammonium phosphate reaction and conditioning is characterized in that a cooling water jacket 12 is arranged outside a reaction kettle 1; a stirrer 2 is arranged on the reaction kettle 1; the stirring machine 2 is provided with stirring blades 11, and when stirring, the medicament in the reaction kettle and the mixed liquid (hereinafter referred to as "mixed liquid") after thermal alkaline hydrolysis of sludge are fully mixed and reacted to condition the mixed liquid, so that the mud-water separation performance of the mixed liquid is improved, the reaction kettle 1 is wrapped by the cooling water jacket 12, the lower part of the reaction kettle is provided with a cooling circulation water inlet, and the upper part of the reaction kettle is provided with a cooling circulation water outlet 15; the cooling circulation water outlet 15 is connected with an external cooling tower 17, the cooling tower 17 is connected with an external circulation water tank 18, the external circulation water tank 18 is connected with a cooling circulation water pump 19, and the cooling circulation water pump 19 is connected with the cooling circulation water inlet 13. Also included in this embodiment is a bracket 10; the support 10 is arranged on the outer wall surface of the reaction kettle 1. In this embodiment, the reaction kettle 1 is provided with an air collecting port 6. The reactor also comprises an observation port 5, wherein the observation port 5 is arranged on the reaction kettle 1. The observation port 5 is convenient for observing the reaction process in the reaction kettle at any time. Still include pH meter 7 in this embodiment, pH meter 7 sets up on reation kettle 1, inside pH meter 7's probe stretched into reation kettle, the signal line of pH meter and programmable logic controller (PLC controller) 9 link to each other, are convenient for regulate and control the pH value in the reation kettle. The reaction kettle also comprises a thermometer 8, and the thermometer 8 is arranged on the reaction kettle 1. The probe of the thermometer extends into the reaction kettle, and the signal wire of the thermometer is connected with the PLC 9, so that the temperature in the reaction kettle can be conveniently regulated and controlled. The reactor also comprises a sludge outlet 14, wherein the sludge outlet 14 is arranged at the bottom of the reaction kettle 1. The sludge outlet 14 is used for discharging the conditioned mixed liquid. The reactor also comprises a sludge inlet 3, wherein the sludge inlet 3 is arranged on the reaction kettle 1. The sludge inlet 3 is filled with mixed liquid obtained after thermal alkaline hydrolysis of sludge. The embodiment also comprises a dosing port 4; the medicine adding port 4 is arranged on the reaction kettle 1. The medicament added by the medicament adding port 4 comprises NH4Cl, MgCl2 and polyacrylamide. The gas collecting port 6 in this embodiment is connected to the spray tower 16 through a pipe. The gas collecting port 6 is used for collecting NH3 in the reaction kettle and is connected with a spray tower, and NH3 is recovered in the form of NH 3. H2O after passing through the spray tower and is reused for Magnesium Ammonium Phosphate (MAP) reaction.
The working principle of the utility model is as follows:
1. mixer
The stirrer is provided with a stirring blade, so that the medicament and the mixed liquid can be fully mixed and reacted, and the mud-water separation performance of the mixed liquid is improved.
2. Medicine adding port
The medicament added into the medicament adding port comprises NH4Cl、MgCl2And polyacrylamide. NH (NH)4Cl and MgCl2Provides a nitrogen source and a magnesium source for the production of struvite products and the realization of the resource utilization of nitrogen and phosphorus in sludge. The polyacrylamide is used as an organic matter type polymeric flocculant, has a good flocculation effect on the cooled thermal alkaline hydrolysis sludge mixed liquid, and promotes the mud-water separation.
3. Air collecting port
The gas collecting port is connected with the spray tower and is used for collecting NH from the reaction kettle3Is conveyed to a spray tower with NH3·H2The O form is recovered and reused for the MAP reaction. The process can be used for treating NH overflowing during the process of conditioning the thermal alkaline hydrolysis sludge and the mixed liquor3The recycling is carried out, and the cost is saved.
4. Cooling water jacket
The cooling water jacket tightly wraps the reaction kettle, the lower part is provided with a cooling circulation water inlet, and the upper part is provided with a cooling circulation water outlet. And the MAP reaction is ensured to be smoothly carried out by cooling the jacket cooling water. The cooling water jacket and the reaction kettle are combined into the equipment for mixing the residual sludge through thermal alkaline hydrolysis, which not only enables the structure of the whole device to be more compact and reduces the occupied area, but also can eliminate a connecting pipe between a cooling area and the reaction kettle.
While there have been shown and described the fundamental principles, principal features and advantages of the utility model, there are numerous variations and modifications which fall within the scope of the utility model as claimed, without departing from the spirit and scope of the utility model.
Claims (10)
1. The utility model provides a hot alkaline hydrolysis excess sludge mixed liquid equipment of cooling magnesium ammonium phosphate reaction-conditioning which characterized in that: a cooling water jacket (12) is arranged outside the reaction kettle (1); a stirrer (2) is arranged on the reaction kettle (1); the stirrer (2) is provided with stirring blades (11), the reaction kettle (1) is wrapped by the cooling water jacket (12), the lower part of the reaction kettle is provided with a cooling circulation water inlet, and the upper part of the reaction kettle is provided with a cooling circulation water outlet (15); the cooling circulation water outlet (15) is connected with an external cooling tower (17), the cooling tower (17) is connected with an external circulation water tank (18), the external circulation water tank (18) is connected with a cooling circulation water pump (19), and the cooling circulation water pump (19) is connected with a cooling circulation water inlet (13).
2. The apparatus for reducing the temperature of mixed liquor of magnesium ammonium phosphate reaction-conditioned thermal alkaline hydrolysis of excess sludge according to claim 1, further comprising a support (10); the support (10) is arranged on the outer wall surface of the reaction kettle (1).
3. The temperature-reducing magnesium ammonium phosphate reaction-conditioning thermal alkaline hydrolysis residual sludge mixed liquor equipment as claimed in claim 1, wherein the reaction kettle (1) is provided with a gas collecting port (6).
4. The equipment for mixing liquid of cooled ammagnesium phosphate reaction-conditioned thermal alkaline hydrolysis residual sludge according to claim 1, further comprising an observation port (5), wherein the observation port (5) is arranged on the reaction kettle (1). The observation port (5) is convenient for observing the reaction process in the reaction kettle at any time.
5. The temperature-reducing magnesium ammonium phosphate reaction-conditioning thermal alkaline hydrolysis residual sludge mixed liquor device according to claim 1, further comprising a pH meter (7), wherein the pH meter (7) is arranged on the reaction kettle (1), a probe of the pH meter (7) extends into the reaction kettle, and a signal line of the pH meter is connected with a Programmable Logic Controller (PLC) (9) so as to conveniently regulate and control the pH value in the reaction kettle.
6. The apparatus for reducing the temperature of mixed liquid of magnesium ammonium phosphate reaction-conditioned thermal alkaline hydrolysis of residual sludge according to claim 1, further comprising a thermometer (8), wherein the thermometer (8) is disposed on the reaction kettle (1). The probe of the thermometer extends into the reaction kettle, and the signal wire of the thermometer is connected with the PLC (9) so as to conveniently regulate and control the temperature in the reaction kettle.
7. The temperature-reducing magnesium ammonium phosphate reaction-conditioning thermal alkaline hydrolysis residual sludge mixed liquor equipment according to claim 1, further comprising a sludge outlet (14), wherein the sludge outlet (14) is arranged at the bottom of the reaction kettle (1). The sludge outlet (14) is used for discharging the conditioned mixed liquid.
8. The temperature-reducing magnesium ammonium phosphate reaction-conditioning thermal alkaline hydrolysis residual sludge mixed liquor equipment according to claim 1, further comprising a sludge inlet (3), wherein the sludge inlet (3) is arranged on the reaction kettle (1).
9. The apparatus for mixing liquid of temperature-reduced amMgP reaction-conditioned thermal alkaline hydrolysis excess sludge according to claim 1, further comprising a dosing port (4); the medicine adding port (4) is arranged on the reaction kettle (1).
10. The apparatus for mixing liquid of temperature-reduced amMgP reaction-conditioned residual sludge from thermal alkaline hydrolysis according to claim 3, wherein the gas collection port (6) is connected to the spray tower (16) through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121005407.5U CN215855748U (en) | 2021-05-11 | 2021-05-11 | Cooling magnesium ammonium phosphate reaction-conditioning thermokalite residual sludge mixed liquid equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121005407.5U CN215855748U (en) | 2021-05-11 | 2021-05-11 | Cooling magnesium ammonium phosphate reaction-conditioning thermokalite residual sludge mixed liquid equipment |
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| Publication Number | Publication Date |
|---|---|
| CN215855748U true CN215855748U (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121005407.5U Active CN215855748U (en) | 2021-05-11 | 2021-05-11 | Cooling magnesium ammonium phosphate reaction-conditioning thermokalite residual sludge mixed liquid equipment |
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| CN (1) | CN215855748U (en) |
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2021
- 2021-05-11 CN CN202121005407.5U patent/CN215855748U/en active Active
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