CN104016427A - Method and system for recovering dissolved phosphorus from sewage by repeatedly using carbon dioxide at room temperature - Google Patents
Method and system for recovering dissolved phosphorus from sewage by repeatedly using carbon dioxide at room temperature Download PDFInfo
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- CN104016427A CN104016427A CN201410267050.6A CN201410267050A CN104016427A CN 104016427 A CN104016427 A CN 104016427A CN 201410267050 A CN201410267050 A CN 201410267050A CN 104016427 A CN104016427 A CN 104016427A
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Abstract
The invention belongs to the field of recovering phosphorus from sewage and discloses a method and system for recovering dissolved phosphorus from sewage by repeatedly using carbon dioxide at room temperature. A phosphorus-dissolving tower is communicated with a carbon dioxide cylinder through a solenoid valve and a pipeline, a tower top is communicated with an air inlet of an air pump, an air outlet of the air pump is communicated with an aeration device located at the bottom of the phosphorus-dissolving tower through a pipeline and a second check valve, a tower bottom is communicated with a water inlet of a sewage filtration device by the solenoid valve arranged at the bottom of the phosphorus-dissolving tower and a pipeline; the sewage filtration device is arranged between the phosphorus-dissolving tower and a phosphorus recovery tower, a water outlet of the sewage filtration device is communicated with the phosphorus recovery tower through a liquid pump, a pipeline and a third check valve; and the top is communicated with the pipeline located between the top of the phosphorus-dissolving tower and the air inlet of the air pump by the solenoid valve located at the top of the phosphorus recovery tower, a pipeline and a vacuum pump. The method and system disclosed by the invention have the advantages of simple device structure and treatment process, low investment and operation cost, stable and reliable performance, good phosphorus-dissolving and phosphorus recovery effects, convenience in maintenance, and low maintenance cost and the like and are applicable to phosphorus-dissolving recovery treatment on various types of phosphorus-containing sewage.
Description
Technical field
The present invention relates to the system that sewage phosphorus element reclaims, more particularly, the present invention relates to reuse the method and system that carbonic acid gas reclaims from the molten phosphorus of sewage under a kind of normal temperature condition, belong to sewage disposal, environmental protection technical field.
Background technology
Phosphorus is the essential element of animal and plant growth, existence, and still, phosphorus excessive in sewage also can cause body eutrophication, and particularly in enclosed waters, its pollution is even more serious.The usage quantity of world's phosphorus, just with annual 1.5% speed increase, is estimated exhausted in 100～250 years of future.Phosphorus, as a kind of Nonrenewable resources, is paid attention to by various countries gradually.Phosphorus in sewage is also a kind of important resource, therefore its recycling is had great importance.
Present stage, the technology of sewage dephosphorization mainly contains chemical dephosphorization method and biological dephosphorization.Magnesium ammonium phosphate method (MAP method) is a kind of chemical phosphorus removal method, by containing NH
4 +sewage adds Mg
2+and PO
4 3+, there is chemical reaction and generate MgNH
4pO
4, its reaction principle as the formula (1).It is because of himself exclusive superiority that MAP method is applied: can reclaim nitrogen and the phosphorus in the liquid of natural pond on the one hand simultaneously, reduce sewage pollution power, the magnesium ammonium phosphate reclaiming on the other hand can be used as the fertilizer of agriculture production.
NH
4 ++ PO
4 3++ Mg
2+→MgNH
4PO
4 （1）
Although MgNH
4pO
4can directly be used as high-quality slow-release phosphate fertilizer, increase economic benefit, and there is the effect of synchronous removal ammonia nitrogen, the feature such as sludge output is little, but also exist running cost high, the chemical reagent of interpolation may cause the problems such as other pollution.
Phosphorus in sewage exists form to mainly include orthophosphoric acid salt, poly-phosphate and organophosphorus, and in secondary biochemical treatment, poly-phosphate and organophosphorus can be converted into orthophosphoric acid salt.Most typical biological phosphate-eliminating pattern is aerobic/anaerobic biological dephosphorization, and in aerobic processes, orthophosphoric acid salt can be absorbed in active sludge in large quantities.These mud have absorbed a large amount of phosphorus, and after precipitating by settling tank, its phosphorus content can reach 5～10% of mud dry weight, and general active sludge also can reach 2%.Present stage, the main processing mode of these active sludge has landfill, burning etc., and this is the processing mode of waste phosphor resource, is unfavorable for the protection of phosphor resource.So, in order to reclaim fully the phosphorus in sewage, in the urgent need to a kind of, can effectively dissolve the phosphorus element in sewage technical matters and the system being reclaimed.
In sum, exploitation high-efficiency sewage phosphorus element recovery process technology and do not introduce pollutent and become and solve sewage and reclaim one of gordian technique of phosphorus and qualified discharge.
Summary of the invention
For above-mentioned problems of the prior art, the object of this invention is to provide a kind of carbonic acid gas that reuses at normal temperatures from the system of the molten phosphorus recovery of sewage, and utilize this system to carry out the method for molten phosphorus recovery, the problem reclaiming to solve sewage phosphorus element.
The present invention adopts following technical scheme to achieve these goals: reuse at normal temperatures the system that carbonic acid gas reclaims from the molten phosphorus of sewage, comprise molten phosphorus tower, sewage filter device and phosphorus recovery tower; The molten phosphorus tower tower body of wherein said molten phosphorus tower is communicated with carbon dioxide steel cylinder by magnetic valve and pipeline, molten phosphorus tower tower body is also communicated with sump pump by the first check valve and pipeline, molten phosphorus column overhead is communicated with the inlet mouth of air pump, the air outlet of air pump is communicated with the aerating apparatus of molten phosphorus tower bottom by pipeline and the second check valve, at the bottom of molten phosphorus tower tower, by molten phosphorus tower bottom magnetic valve and pipeline, is communicated with the water-in of sewage filter device; Described sewage filter device is arranged between molten phosphorus tower and phosphorus recovery tower, and the water outlet of sewage filter device is communicated with phosphorus recovery tower by liquid pump, pipeline and the 3rd check valve; The top of phosphorus recovery tower is by the pipeline communication between phosphorus recovery tower tower top magnetic valve, pipeline and vacuum pump and the gentle pump steam inlet of molten phosphorus column overhead.
In order to implement better native system, described molten phosphorus Ta Tanei is provided with pressure transducer.Between the gentle pump steam inlet of described molten phosphorus column overhead, be provided with pressure release valve.
Particularly, in described sewage filter device, be provided with filter screen.The bottom of described filter screen and sewage filter device is non-parallel setting, and the bottom surface of filter screen and sewage filter device is in a certain angle.
More specifically, the phosphorus recovery tower tower top of described phosphorus recovery tower is provided with air pressure regulator and whipping appts.In phosphorus recovery tower tower, be also provided with carbon dioxide sensor.
Native system also comprises PLC controller, and PLC controller is controlled the switching of each magnetic valve, and the stopping and moving of sump pump, air pump, liquid pump, vacuum pump and whipping appts.
The present invention also provides and has utilized said system to reuse at normal temperatures the method that carbonic acid gas reclaims from the molten phosphorus of sewage, specific as follows:
PLC controller sends control signal and starts far-end sump pump, and sewage pumps in molten phosphorus tower by the first check valve, after reaching predetermined water level, closes sump pump.
PLC controller sends signal enabling magnetic valve, and the carbonic acid gas in carbon dioxide steel cylinder enters molten phosphorus tower by magnetic valve, the shut electromagnetic valve when pressure transducer arranging in tower detects pressure and reaches preset value; PLC controller is controlled air pump and is started, in tower carbonic acid gas under air pump thrust through the second check valve and aerating apparatus, be dissolved in fast in sewage, pH value of sewage water fast-descending in molten phosphorus tower, when sewage pH is not higher than 6.8 time, insoluble phosphorus in suspended substance is able to stripping and exists in sewage with the orthophosphoric acid salt of solubility, now stops air pump; In some waste water, can contain volatile gases, thus in gas circuit, be provided with pressure release valve, if the pressure in molten phosphorus tower surpasses safe threshold values, by pressure release valve relief pressure.
PLC controller sends the molten phosphorus tower bottom of signal enabling magnetic valve sewage in tower is entered to sewage filter device; Because sewage was removed large suspended substance before entering tower, do not do other pre-treatment, may contain a large amount of suspended substances, the quality of phosphorus product is reclaimed in impact, thus the inner filter screen that is provided with the 500um of the gradient 5%, thus the suspended substance of large particle diameter in sewage is removed in assurance.
PLC controller is controlled molten phosphorus tower bottom closed electromagnetic valve and is started far-end sump pump, pumps into quantitative sewage and enters molten phosphorus tower; Liquid pump controlled by PLC controller simultaneously and air pressure regulator starts, and the sewage after sewage filter device filters is pumped into phosphorus recovery tower by the 3rd check valve, when liquid level arrives after specified location, closes air pressure regulator and liquid pump.
PLC controller controls far-end sump pump and cuts out, and opens phosphorus simultaneously and reclaims tower top magnetic valve, vacuum pump and whipping appts; The carbonic acid gas dissolving in water is under mechanical agitation, and from sewage, volatilization is overflowed fast, and vacuum pump extracts carbonic acid gas again by air pump, aerating apparatus, inject in the sewage of molten phosphorus tower; After the inner carbon dioxide sensor signal stabilization of phosphorus recovery tower, close phosphorus and reclaim tower top magnetic valve and vacuum pump, phosphorus recovery tower bottom electrical magnet valve and air pressure regulator to be opened, sewage is discharged precipitation and is reclaimed phosphorus compound; System completes an integral body circulation.
In above-mentioned phosphorus recovery tower, sewage is after carbonic acid gas extracts, and pH is climbed to meet and generates Ca
3(PO
4)
2scope and the scope of magnesium ammonium phosphate.In order to reclaim fully positive phosphorus, so after sewage is discharged, can further adopt and add containing Ca
2+alkaline matter or reclaim remaining positive phosphorus in sewage by magnesium ammonium phosphate method.
The present invention is owing to taking above technical scheme will produce following beneficial effect:
1, pass through CO
2gas closed circulation is utilized, and reaches molten phosphorus, reclaims the object of phosphorus, and do not produce during the course hazardous and noxious substances, for environment protection, plays an important role.
2, the phosphorus in sewage and suspended substance is separated out and is removed, and for the subsequent disposal of sewage eases off the pressure, saves cost of sewage disposal.
3, in sewage, suspended substance is removed in filtration unit, and for the recovery of high-quality phosphorus compound lays the first stone, the product of recovery can be used as chemical fertilizer or raw material re-uses.
4, the automatization of whole process is controlled and can be alleviated people's labour intensity, and can guarantee carrying out continuously of work.
5, apparatus of the present invention have simple in structure, cost of investment is low, stripping is stable and reliable for performance, good purification, operational management and safeguard the advantages such as easy, be applicable to all kinds of raw materials natural pond liquid qualified discharge and process.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention;
In figure: 1-PLC controller; 21-the first check valve; 22-the second check valve; 23-the 3rd check valve; The molten phosphorus tower of 3-; The molten phosphorus column overhead of 31-; The molten phosphorus tower of 32-tower body; At the bottom of the molten phosphorus tower of 33-tower; 4-carbon dioxide steel cylinder; 5-magnetic valve; 6-pressure release valve; 7-air pump; 8-aerating apparatus; The molten phosphorus tower bottom of 9-magnetic valve; 10-sewage filter device; 11-liquid pump; 12-phosphorus recovery tower; 121-phosphorus recovery tower tower top; 122-phosphorus recovery tower tower body; At the bottom of 123-phosphorus recovery tower tower; 13-whipping appts; 14-phosphorus recovery tower tower top magnetic valve; 15-vacuum pump; 16-phosphorus recovery tower bottom electrical magnet valve; 17-air pressure regulator; 18-filter screen.
Embodiment
Below in conjunction with drawings and Examples, system of the present invention is described in detail.
As shown in Figure 1, system of the present invention comprises PLC controller 1, molten phosphorus tower 3, sewage filter device 9 and phosphorus recovery tower 12.
As shown in Figure 1, molten phosphorus tower 3 comprises at the bottom of molten phosphorus column overhead 31, molten phosphorus tower tower body 32, molten phosphorus tower tower 33, the both ends of the surface of molten phosphorus tower tower body 32 are provided with ring flange between 33 upper surfaces respectively and at the bottom of molten phosphorus column overhead 31 lower surfaces and molten phosphorus tower tower, between adjacent ring flange, be provided with gasket, and be bolted together, guarantee that stripping tower has good stopping property.Molten phosphorus tower tower body 32 is communicated with far-end sump pump 0 by the first check valve 21 and pipeline, and the extraction that PLC controller 1 startup far-end sump pump 0 completes sewage enters the work of tower.The air outlet of molten phosphorus column overhead 31 is connected with the inlet end of air pump 7 by pipeline, pressure release valve 6, the outlet side of air pump 7 is connected with the second check valve 22, carbon dioxide enters in molten phosphorus tower 3 via the aerating apparatus 8 of molten phosphorus tower tower body 32 inside again, in tower, sewage reaches after predetermined amount, close far-end sump pump 0, open air pump 7 simultaneously and complete CO
2dissolving work, now molten phosphorus tower bottom magnetic valve 9 and phosphorus recovery tower top, phosphorus recovery tower top magnetic valve 14 are in closing condition.Molten phosphorus Ta Tanei is provided with pressure transducer, when in tower, gas pressure intensity drops to regulation lower bound, and opens solenoid valve 5, gaseous carbon dioxide enters in molten phosphorus tower 3 fast from carbon dioxide steel cylinder 4, and when reaching in limited time, shut electromagnetic valve 5.Molten phosphorus tower tower body 32 is communicated with carbon dioxide steel cylinder 4 by magnetic valve 5.In tower, sewage reduces gradually in the dissolution process of carbonic acid gas, when pH can reach 6.8, closes air pump 7.Molten phosphorus tower bottom magnetic valve 9 is opened sewage in discharge tower.
As shown in Figure 1, after molten phosphorus tower bottom magnetic valve 9 is opened, the sewage of low pH enters sewage filter device 10 under the effect of molten phosphorus tower internal pressure, and in order to guarantee the suspended substance removal of large particle diameter in sewage, sewage filter device inside is provided with the 500um filter screen 18 of the gradient 5%.After sewage emptying, close molten phosphorus tower bottom magnetic valve 9, open far-end sump pump 0 simultaneously.
As shown in Figure 1, oettIed sewage enters phosphorus recovery tower 12 through liquid pump 11 and the 3rd check valve 23, and when pump is got low pH sewage, PLC controller 1 is controlled and opened air pressure regulator 17.
As shown in Figure 1, phosphorus recovery tower 12 comprises at the bottom of phosphorus recovery tower tower top 121, phosphorus recovery tower tower body 122 and phosphorus recovery tower tower 123, the both ends of the surface of phosphorus recovery tower tower body 122 arrange ring flange between 123 upper surfaces respectively and at the bottom of phosphorus recovery tower tower top 121 lower surfaces and phosphorus recovery tower tower, between adjacent ring flange, be provided with gasket, and be bolted together, guarantee that stripping tower has good stopping property.Phosphorus recovery tower tower top 121 is provided with whipping appts 13, is mainly used in the stirring carbon dioxide gas of sewage.Phosphorus recovery tower tower top 121 tops are also provided with air outlet, and air outlet is connected with phosphorus recovery tower top magnetic valve 14, by pipeline and vacuum pump 15, connect 15 gas-circulating systems that connect into molten phosphorus tower 3.The carbonic acid gas that vacuum pump 15 can discharge sewage is taken away fast and is expelled in the sewage of molten phosphorus tower 3, thereby has again used it to reduce process and the function of the molten phosphorus of pH.When the carbon dioxide content of phosphorus recovery tower 12 inside reaches balance, carbon dioxide sensor can pass the signal to PLC controller 1 in time, and magnetic valve 13 cuts out.
As shown in Figure 1, during discharge phosphorus recovery tower 12 inner sewage, PLC controller 1 is opened air pressure regulator 17 and phosphorus recovery tower bottom electrical magnet valve 16, thereby assurance liquid can be discharged under action of gravity.In order to guarantee that there is enough pressure molten phosphorus tower 3 inside, magnetic valve 5 is opened, when internal pressure reaches shut electromagnetic valve 5 of higher limit.
Native system is for the test of cow dung, pig manure anaerobic digestion solution and municipal wastewater etc., and cow dung anaerobic digestion solution is 2.10 times of untreated phosphorus content after processing, pig manure up to 2.95 times, municipal wastewater reach 1.7 times.In phosphorus recovery tower, phosphorous recovery can reach more than 98% substantially.
Claims (10)
1. reuse at normal temperatures the system that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: comprise molten phosphorus tower (3), sewage filter device (10) and phosphorus recovery tower (12); The molten phosphorus tower tower body (32) of wherein said molten phosphorus tower (3) is communicated with carbon dioxide steel cylinder (4) by magnetic valve (5) and pipeline, molten phosphorus tower tower body (32) is also communicated with sump pump (0) by the first check valve (21) and pipeline, molten phosphorus column overhead (31) is communicated with the inlet mouth of air pump (7), the air outlet of air pump (7) is communicated with the aerating apparatus (8) of molten phosphorus tower (3) bottom by pipeline and the second check valve (22), and at the bottom of molten phosphorus tower tower, (33) are communicated with the water-in of sewage filter device (10) by molten phosphorus tower bottom magnetic valve (9) and pipeline; Described sewage filter device (10) is arranged between molten phosphorus tower (3) and phosphorus recovery tower (12), and the water outlet of sewage filter device (10) is communicated with phosphorus recovery tower (12) by liquid pump (11), pipeline and the 3rd check valve (23); The top of phosphorus recovery tower (12) is by the pipeline communication between phosphorus recovery tower tower top magnetic valve (14), pipeline and vacuum pump (15) and molten phosphorus column overhead (31) and air pump (7) inlet mouth.
2. reuse at normal temperatures according to claim 1 the system that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: in described molten phosphorus tower (3) tower, pressure transducer is installed.
3. reuse at normal temperatures according to claim 1 the system that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: between described molten phosphorus column overhead (31) and air pump (7) inlet mouth, be provided with pressure release valve (6).
4. reuse at normal temperatures according to claim 1 the system that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: in described sewage filter device (10), be provided with filter screen (18).
5. reuse at normal temperatures according to claim 4 the system that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: described filter screen (18) is non-parallel setting with the bottom of sewage filter device (10).
6. reuse at normal temperatures according to claim 1 the system that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: the phosphorus recovery tower tower top (121) of described phosphorus recovery tower (12) is provided with air pressure regulator (17).
7. reuse at normal temperatures according to claim 1 the system that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: described phosphorus recovery tower (12) tower top is also provided with whipping appts (13).
8. according to reusing at normal temperatures the system of carbonic acid gas from the molten phosphorus recovery of sewage described in claim 1 to 7 any one, it is characterized in that: also comprise PLC controller (1), PLC controller (1) is controlled the switching of each magnetic valve, and the stopping and moving of sump pump (0), air pump (7), liquid pump (11), vacuum pump (15) and whipping appts (13).
9. utilize system described in claim 1 to reuse at normal temperatures the method that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that:
PLC controller (1) sends control signal and starts far-end sump pump (0), and sewage pumps in molten phosphorus tower (3) by the first check valve (21), after reaching predetermined water level, closes sump pump (0);
PLC controller (1) sends signal enabling magnetic valve (5), and the carbonic acid gas in carbon dioxide steel cylinder (4) enters molten phosphorus tower (3) by magnetic valve (5), shut electromagnetic valve (5) when the pressure transducer arranging in tower detects pressure and reaches preset value; PLC controller (1) is controlled air pump (7) and is started, and in tower, carbonic acid gas, through the second check valve (22) and aerating apparatus (8) under air pump thrust, is dissolved in sewage fast, when sewage pH is not higher than 6.8 time, stops air pump (7);
PLC controller (1) sends the molten phosphorus tower bottom of signal enabling magnetic valve (9) sewage in tower is entered to sewage filter device (10);
PLC controller (1) controls molten phosphorus tower bottom magnetic valve (9) and cuts out and start far-end sump pump (0), pumps into quantitative sewage and enters molten phosphorus tower (3); Liquid pump (11) controlled by PLC controller (1) simultaneously and air pressure regulator (17) starts, sewage after sewage filter device (10) filters is pumped into phosphorus recovery tower (12) by the 3rd check valve (23), when liquid level arrives after specified location, close air pressure regulator (17) and liquid pump (11);
PLC controller (1) controls far-end sump pump (0) and cuts out, and opens phosphorus simultaneously and reclaims tower top magnetic valve (14), vacuum pump (15) and whipping appts (13); The carbonic acid gas dissolving in water is under mechanical agitation, and from sewage, volatilization is overflowed fast, and vacuum pump (15) extracts carbonic acid gas again by air pump (7), aerating apparatus (8), inject in the sewage of molten phosphorus tower (3); After the inner carbon dioxide sensor signal stabilization of phosphorus recovery tower (12), close phosphorus and reclaim tower top magnetic valve (14) and vacuum pump (15), phosphorus recovery tower bottom electrical magnet valve (123) and air pressure regulator (17) are opened, and sewage is discharged precipitation and is reclaimed phosphorus compound; System completes an integral body circulation.
10. reuse at normal temperatures according to claim 9 the method that carbonic acid gas reclaims from the molten phosphorus of sewage, it is characterized in that: if the pressure in molten phosphorus tower (3) surpasses safe threshold values, by pressure release valve (6) relief pressure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410267050.6A CN104016427B (en) | 2014-06-16 | 2014-06-16 | Reuse the method and system that carbonic acid gas reclaims from the molten phosphorus of sewage at normal temperatures |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410267050.6A CN104016427B (en) | 2014-06-16 | 2014-06-16 | Reuse the method and system that carbonic acid gas reclaims from the molten phosphorus of sewage at normal temperatures |
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| Publication Number | Publication Date |
|---|---|
| CN104016427A true CN104016427A (en) | 2014-09-03 |
| CN104016427B CN104016427B (en) | 2015-08-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105688629A (en) * | 2016-01-15 | 2016-06-22 | 南开大学 | Method and system for purifying anaerobic fermentation gas and recycling phosphate and carbon dioxide |
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| CN104016427B (en) | 2015-08-19 |
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