CN105502866A - Method and system for recycling struvite from sludge - Google Patents
Method and system for recycling struvite from sludge Download PDFInfo
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- CN105502866A CN105502866A CN201610084036.1A CN201610084036A CN105502866A CN 105502866 A CN105502866 A CN 105502866A CN 201610084036 A CN201610084036 A CN 201610084036A CN 105502866 A CN105502866 A CN 105502866A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
- C01B25/451—Phosphates containing plural metal, or metal and ammonium containing metal and ammonium
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a method and a system for recycling struvite from sludge, and solves a problem that lots of phosphorus resources are wasted as a large number of phosphorus elements exist in a solid phase and cannot be fully released or extracted during sludge treatment. The method comprises the following steps: firstly, performing ultrasonic treatment on thick sludge in an ultrasonic reaction tank while stirring; secondly, performing solid-liquid separation treatment on the thick sludge subjected to ultrasonic treatment through a diaphragm plate-and-frame filter press to obtain a dehydrated mud cake and a filtrate, and conveying the dehydrated mud cake out to be processed; thirdly, performing secondary filtration on the filtrate through a filtering device to obtain a secondary filtrate, and mixing the secondary filtrate with a magnesium source according to a molar ratio of Mg: P of being (1.3-1.5): 1 in a struvite reaction recovery device for struvite reaction treatment, wherein the reaction treating time is controlled to be 2 hours, and in the struvite reaction treatment process, struvite particles are precipitated out from the secondary filtrate; finally, collecting the precipitated out struvite particles after the struvite reaction treatment, allowing the secondary filtrate to flow back to a sewage treatment plant to be treated further.
Description
Technical field
The present invention relates to technical field of sludge treatment, be specially a kind of method and system reclaiming struvite from mud.
Background technology
Based in the municipal wastewater treating processes of activated sludge process technology system, in municipal wastewater, about there is 80%TP finally can be transferred in residue municipal sludge.Current filter press deep dehydration is in industry widely applied as important sludge reduction processing mode, but because in sludge dewatering filtrate, phosphorus concentration is higher, if directly refluxed by sludge dewatering filtrate, sewage work inside can be caused to return load higher; In addition, barrier film sheet frame deep dehydration leading portion many employings lime chemical agent is nursed one's health mud, cause the phosphorus element in mud to be stored in mud solid phase more, and be not easily transferred in liquid phase, this just makes the organophosphorus in the mud after barrier film sheet frame deep dehydration can not get abundant release, and the direct burning of phosphorous dewatered sludge or landfill stabilization all can cause the waste of a large amount of phosphor resource; And because barrier film sheet frame deep dehydration leading portion have employed chemical agent, cause mud following resource to utilize relative difficulty, limit outlet; If but mud does not adopt chemical agent to nurse one's health before sheet frame deep dehydration, sludge dewatering difficulty can be caused again, cannot effective solid-liquid separation be carried out, finally cause mud cake shapeless, affect sludge treatment effect.Thus from mud, how to extract phosphorus is current sludge treatment problem demanding prompt solution.
Struvite, main chemical compositions is MgNH
4pO
46H
2o, in white crystals fine particle or Powdered, is a kind of Rock Phosphate (72Min BPL) of GOOD TASTE, is also a kind of fabulous slow-release fertilizer, at occurring in nature struvite reserves seldom and still fall at the fast speed.When containing Mg in solution
2+, NH
4+, H
npO
4 n-3and ionic concn just there will be spontaneous precipitation when amassing the solubility product constant being greater than struvite thus forms MgNH
4pO
46H
2o, reaction equation:
Mg
2++PO
4 3-+NH
4 ++6H
2O→MgNH
4PO
4·6H
2O
Mg
2++HPO
4 2-+NH
4 ++6H
2O→MgNH
4PO
4·6H
2O+H
+
Mg
2++H
2PO
4 3-+NH
4 ++6H
2O→MgNH
4PO
4·6H
2O+2H
+。
Thus current appearance in sewage treatment area extracts the method for struvite and recovery reaction unit from sewage solution, but mostly it is to design for phosphorus-containing wastewater, adopt Continuous Flow operating method, the flow rate of water flow risen continuously in reactor is higher, fine particle struvite is very easily caused to run off in a large number with water outlet, thus affect effluent quality and phosphorus organic efficiency, and in order to keep sufficient hydraulic detention time and protected bird coprolite to generate and effect of settling, also whipping appts is installed in the recovery reaction unit of struvite more, also just result in the height reclaiming reaction unit high, volume is large, greatly affect space availability ratio, increase facility investment.
Summary of the invention
For the problems referred to above, the invention provides a kind of method reclaiming struvite from mud, it can solve the element of phosphorus in existing sludge handling process and be stored in a large number in solid phase and cannot fully discharge and extract and cause the problem of a large amount of wastes of phosphor resource; For this reason, present invention also offers the system reclaiming struvite from mud.
A kind of method reclaiming struvite from mud, it is characterized in that: first in ultrasonic reaction pot, while stirring supersound process is carried out to thickened sludge, then barrier film plate-and-frame filter press is adopted to carry out solid-liquid separation process to the thickened sludge after described supersound process, obtain dehydrated sludge cake and filtrate, described dehydrated sludge cake outward transport is disposed, filtration unit carries out secondary filtration to described filtrate and obtains secondary filtrate, in Mg:P mol ratio (1.3 ~ 1.5) in struvite reaction retrieving arrangement: secondary filtrate mixes with magnesium source by the ratio of 1 carries out struvite reaction treatment, described struvite reacting treatment time controls at 2 hours, in described struvite reaction treatment process, struvite particle is from Precipitation in described secondary filtrate, the described struvite particle of precipitation is collected after struvite reaction treatment, secondary filtrate is back to sewage work and processes further.
Further, the acoustic density of described supersound process controls at 0.2W/mL ~ 0.5W/mL, and ultrasonic time is 60 ~ 90 minutes.
Further, barrier film plate-and-frame filter press is adopted to carry out in solid-liquid separation treating processes to the thickened sludge after described supersound process, the feed pressure of barrier film plate-and-frame filter press controls at 1.0Mpa, feed time controls at 1.5 hours, squeeze pressure controls at 1.6MPa, squeezing time controling was at 1.0 hours, and dump process remains on 0.5 hour.
Further, after described secondary filtration, the suspension content controlled in described secondary filtrate is down to below 10mg/L.
Further, when carrying out struvite reaction and reclaiming, synchronous pH value monitoring is carried out to the reaction soln in struvite reaction retrieving arrangement, controls the pH value of reaction soln between 7.5 ~ 8.5.
From mud, reclaim a system for struvite, it is characterized in that: it comprises
Sludge thickener, for the concentrated collection of mud;
Sludge by Ultrasonic retort, for carrying out supersound process to thickened sludge, makes thickened sludge fragmentation cause cell rupture, promotes ICW and PO
4 3-release;
Barrier film plate-and-frame filter press, for carrying out solid-liquid separation to the thickened sludge after supersound process, is separated to obtain solid phase mud cake and liquid phase filtrate;
Filtration unit, carries out secondary filtration with to liquid phase filtrate, thus obtains secondary filtrate;
Struvite reaction retrieving arrangement, collects for carrying out struvite reaction to described secondary filtrate;
The discharge opening pipeline of described sludge thickener connects the opening for feed of described Sludge by Ultrasonic retort, the discharge gate pipeline of described Sludge by Ultrasonic retort connects the opening for feed of described barrier film plate-and-frame filter press, the filtrate outlet of described barrier film plate-and-frame filter press connects the fluid inlet of described struvite reaction retrieving arrangement by described transition apparatus pipeline, described struvite reaction retrieving arrangement is provided with magnesium source and adds mouth, and the bottom of described struvite reaction retrieving arrangement is provided with leakage fluid dram and discharge gate valve.
Further, ultrasonic generator and whipping appts is provided with in described Sludge by Ultrasonic retort.
Further, described struvite reaction retrieving arrangement comprises tank body and external circulation return pipe, reaction zone, top and negative area, bottom is provided with in described tank body, negative area, described bottom is back taper, liquid distributor is provided with between reaction zone, described top and negative area, bottom, described top is provided with reactor in reaction zone, mouth is added in described magnesium source, fluid inlet connects into described liquid distributor respectively by pipeline, the reaction zone, top of described tank body is provided with top circulation fluid refluxing opening and the import of bottom cycle liquid, described circulation return pipe and described top circulation fluid refluxing opening, the import of bottom cycle liquid connects respectively by circulation line, described bottom cycle liquid inlet ductwork connects into described liquid distributor.
Further, described reactor comprises the stainless steel reaction lining of hollow, is filled with stainless (steel) wire in described stainless copper reaction lining.
Further, the top of described stainless steel reaction lining, bottom are respectively arranged with flow-stopping plate.
Further, the tank body of described struvite retrieving arrangement also connects acid solution case, lye tank respectively, and described tank body is provided with pH value on-line measuring device, described pH value on-line measuring device is used for the pH value detecting in real time the secondary filtrate of reaction and the reaction soln in magnesium source in described tank body, and the pH value of the reaction soln that described acid solution case, lye tank detect according to described pH value on-line measuring device is thrown in acid solution or alkali lye thus regulated the pH value of reaction soln between 7.5 ~ 8.5 in described tank body.
Further, described struvite retrieving arrangement is also provided with PLC control system, is arranged at that mouth, fluid inlet, leakage fluid dram, acid solution case, the by-pass valve control of lye tank and discharge gate valve are added in described magnesium source, circulation return pipe, pH value on-line measuring device electricly connect with described PLC control system respectively respectively.
A kind of beneficial effect reclaiming the method and system of struvite from mud of the present invention is: it first carries out supersound process to thickened sludge and makes thickened sludge fragmentation cause cell rupture, thus promotes ICW and PO
4 3-be released in liquid phase, solid-liquid separation is carried out again by barrier film plate-and-frame filter press, add magnesium source in the secondary filtrate obtained after solid-liquid separation again carry out struvite reaction treatment thus obtain struvite particle, thus the phosphorus concentration effectively reduced in sludge dewatering filtrate, the sludge dewatering filtrate reducing sewage work returns load; And by the supersound process to mud, promote that the solid-state TP in mud is most of with PO
4 3-form is transferred in liquid phase, effectively improves the phosphorus content in sludge dewatering filtrate after mud solid-liquid separation, for the follow-up struvite extraction recovery that improves in sludge dewatering filtrate creates favourable condition; And, carrying out not needing in the supersound process before the process of barrier film filter press to add any chemical conditioning medicament, supersound process can make mud inner cell moisture discharge thus mud free water ratio is increased, reduce the dehydration difficulty of follow-up barrier film plate-and-frame filter press to mud, and be conducive to obtaining the mud cake of more low-water-content, fully realize sludge reduction.
In addition, struvite reaction retrieving arrangement in the present invention in system have employed external circulation return pipe and carries out the reaction of closed loop pump circulation to the sludge dewatering filtrate after secondary filtration and magnesium source, thus it can not cause the struvite fine particle of precipitation to run off with water outlet in reaction treatment process, ensures effluent quality and the struvite recovering effect of filtrate; And owing to have employed the mode of closed loop pump circulation reaction, thus can coordinate the work period in barrier film filter press face and realize struvite reclaim sequence batch (operation, its inside realizes the current stirring of circulating reaction solution by liquid distributor and reactor and no longer needs to arrange agitator simultaneously, also just can effectively reduce the volume of tank body and reduce floor space, having saved capital construction and facility investment.
Accompanying drawing explanation
Fig. 1 is a kind of System's composition schematic diagram reclaiming struvite from mud of the present invention;
Fig. 2 is the structural representation of struvite reaction retrieving arrangement in the present invention.
In accompanying drawing, 10 is sludge thickener, 11 is discharge port, 20 is Sludge by Ultrasonic retort, 21 is opening for feed, 22 is discharge gate, 23 is ultrasonic generator, 24 is whipping appts, 30 is barrier film plate-and-frame filter press, 31 is opening for feed, 32 is filtrate outlet, 33 is mud cake discharge end, 40 struvite reaction retrieving arrangements, 41 is fluid inlet, 42 for adding mouth in magnesium source, 43 is leakage fluid dram, 44 is discharge gate valve, 45 is tank body, 451 is reaction zone, top, 4511 is top circulation fluid refluxing opening, 4512 is the import of bottom cycle liquid, 452 is negative area, bottom, 453 is overflow port, 46 is circulation return pipe, 47 is liquid distributor, 48 is reactor, 481 is stainless steel reaction lining, 482 is stainless (steel) wire, 483 is flow-stopping plate, 484 is flow-stopping plate, 49 is pH value on-line measuring device, 50 is filtration unit, 60 is acid solution case, 70 is alkaline case.
Embodiment
See Fig. 1, a kind of system reclaiming struvite from mud of the present invention, it comprises
Sludge thickener 10, for the concentrated collection of mud;
Sludge by Ultrasonic retort 20, for carrying out supersound process to thickened sludge, makes thickened sludge fragmentation cause cell rupture, promotes ICW and PO
4 3-release, be provided with ultrasonic generator 23 and whipping appts 24 in Sludge by Ultrasonic retort 20;
Barrier film plate-and-frame filter press 30, for carrying out solid-liquid separation to the thickened sludge after supersound process, is separated to obtain solid phase mud cake and liquid phase filtrate;
Filtration unit 50, carries out secondary filtration with to liquid phase filtrate, thus obtains secondary filtrate;
Struvite reaction retrieving arrangement 40, collects for carrying out struvite reaction to described liquid phase filtrate;
Wherein discharge port 11 pipeline of sludge thickener 10 connects the opening for feed 21 of Sludge by Ultrasonic retort 20, discharge gate 22 pipeline of Sludge by Ultrasonic retort 20 connects the opening for feed 31 of barrier film plate-and-frame filter press 30, the fluid inlet 41 that the filtrate outlet 32 of barrier film plate-and-frame filter press 30 reacts retrieving arrangement 40 by filtration unit 50 and struvite is connected, struvite reaction retrieving arrangement 40 is provided with magnesium source and adds mouth 42, and the bottom of struvite reaction retrieving arrangement 40 is provided with leakage fluid dram 43 and discharge gate valve 44.
See Fig. 2, struvite reaction retrieving arrangement 40 comprises tank body 45 and external circulation return pipe 46, reaction zone, top 451 and negative area, bottom 452 is provided with in tank body 45, negative area, bottom 452 is in back taper, liquid distributor 47 is provided with between reaction zone, top 451 and negative area, bottom 452, reactor 48 is installed in reaction zone, top 451, mouth 42 is added in magnesium source, fluid inlet 41 connects into liquid distributor 47 respectively by pipeline, the reaction zone, top 451 of tank body 45 is provided with top circulation fluid refluxing opening 4511 and bottom cycle liquid import 4512, circulation return pipe 46 and top circulation fluid refluxing opening 4511, bottom cycle liquid import 4512 respectively pipeline connects, bottom cycle liquid import 4512 pipeline connects into liquid distributor 47, reactor 48 comprises the stainless steel reaction lining 481 of hollow, is filled with stainless (steel) wire 482 in stainless copper reaction lining 481, the top of stainless steel reaction lining 481, bottom are respectively arranged with flow-stopping plate 483,484.
The tank body 45 of struvite retrieving arrangement 40 also connects acid solution case 60, lye tank 70 respectively, and tank body 45 is provided with pH value on-line measuring device 49, pH value on-line measuring device 49 is for detecting the pH value of the secondary filtrate of reaction and the reaction soln in magnesium source in tank body 45 in real time, and the pH value of the reaction soln that acid solution case 60, lye tank 70 detect according to pH value on-line measuring device 49 is thrown in acid solution or alkali lye thus regulated the pH value of reaction soln between 7.5 ~ 8.5 in tank body 45.
Struvite retrieving arrangement 40 is also provided with PLC control system, for controlling the automatic operating of whole birds droppings retrieving arrangement 40, be arranged at that mouth 42, fluid inlet 41, leakage fluid dram 43, acid solution case 60, the by-pass valve control of lye tank 70 and discharge gate valve 44 are added in magnesium source, circulation return pipe 46, pH value on-line measuring device 49 electricly connect with PLC control system respectively respectively.
Below in conjunction with accompanying drawing, specifically describe and adopt present system from mud, reclaim the method for struvite:
Embodiment one:
In sludge thickener 10 water ratio be 97% thickened sludge pump in ultrasonic reaction pot 20 by discharge port 11 by opening for feed 21, unlatching ultrasonic generator 23 and whipping appts 24 carry out supersound process to the thickened sludge entered in ultrasonic reaction pot 20, the ultrasonic power of ultrasonic generator 23 is set to 0.4W/mL, sonication treatment time 60 minutes;
Ultrasonic reaction pot 20 will be discharged through the thickened sludge of supersound process from discharge gate 22 and pumped into barrier film sheet frame by opening for feed 31 and take by force in pressure filter 30 and carry out solid-liquid separation process, control feed pressure is 1.0Mpa, feed time is 1.5 hours, squeeze pressure controls 1.6Mpa, squeezing time 1.0 hours, solid phase after filter-press dehydration process in mud with water ratio be mainly about 55% mud cake form unload from mud cake discharge end 33 and transport outward and carry out following resource process, containing the PO discharged from thickened sludge
4 3-filtrate discharge through filtrate outlet 32, wherein the discharging time of dehydrated sludge cake controlled at 0.5 hour.
Carry out secondary filtration from the filtrate of filtrate outlet 32 discharge through secondary filter and obtain secondary filtrate, control the suspension content < 10mg/L of secondary filtrate;
After secondary filtrate pumps into the tank body 45 interior extremely setting liquid level of struvite reaction retrieving arrangement 40 by fluid inlet 41, PLC control system controls the valve of closedown fluid inlet 41, stop feed liquor, then PLC control system controlled circulation reflux pump 46 is opened, circulation return pipe 46 sucks filtrate from top circulation fluid refluxing opening 4511, liquid distributor 47 is entered again by bottom cycle liquid import 5412, through the stainless (steel) wire 482 of liquid distributor 47 upwelling in stainless steel reaction lining 481, add mouth 42 in the ratio of Mg:P mol ratio 1.4:1 by magnesium source in tank body, add magnesium source and be distributed into by liquid distributor 47 in the stainless (steel) wire 482 in stainless steel reaction lining 481, the magnesium source of adding in the present embodiment is MgCl
2, reaction unit is connected with pH value on-line computing model, control pH scope is at 7.5-8.5, backflow filtrate, the magnesium source of adding is at liquid distributor 47 and flow-stopping plate 483, the lower disturbance current forming circulation and rise of 484 effects, disturbance current flow through stainless (steel) wire 482, at turbulence prediction, under the effect of collision, struvite crystallite starts to generate, then the crystallite refluxed in filtrate can be used as again the increasing that crystal seed accelerates struvite crystals particle, along with the carrying out of reaction, struvite macrobead is settled down to negative area 452, bottom, the overall struvite reaction times controls at 2 hours, reaction soln in whole reaction process in pH value on-line measuring device 49 pairs of tank bodies 45 carries out real-time pH value and detects, PLC control system controls acid solution case 60 according to the pH value detected result received, lye tank 70 is thrown in acid solution or alkali lye thus is realized regulating to make pH value in the span of control of 7.5 ~ 8.5 to the pH value of the reaction soln in tank body 45 in tank body 45, reaction terminates the emptying filtrate of valve open that rear PLC control system controls leakage fluid dram 43, filtrate is back to Sewage Plant and processes further, and control the discharge gate valve 44 opening bottom, obtain struvite product.
The struvite reaction retrieving arrangement of present system also has cleaning function, usually every 30 days, emptying whole struvite reaction unit, by fluid inlet 41 by liquid distributor 47 to injected clear water washing lotion in tank body, start circulation return pipe 46, pumping into acid solution according to pH detected result by acid solution case 60, circulate 30 ~ 60 minutes, getting rid of diluted acid for cleaning until without shut-down operation during obvious fouling product by tank body 45 bottom discharging gate valve 44; Acid solution ratio and concentration can adjust targetedly according to the fouling thickness on tube wall.Cleaning set time 1h or pH value are tending towards in certain limit, and think that cleaning terminates, circulation cleaning device quits work, and diluted acid is found time by return-flow system, again carries out clean water, completes cleaning process.
Embodiment two is different from embodiment one, is that the ultrasonic power of ultrasonic generator 23 is set to 0.2W/mL, sonication treatment time 75 minutes, adds MgCl in struvite reaction removal process in the ratio of Mg:P mol ratio 1.5:1
2and be distributed into by liquid distributor 47 in the stainless (steel) wire 482 in stainless steel reaction lining 481.
Implement three to be from the different of embodiment one, two, the ultrasonic power of ultrasonic generator 23 is set to 0.5W/mL, sonication treatment time 90 minutes, adds MgCl in struvite reaction removal process in the ratio of Mg:P mol ratio 1.3:1
2and be distributed into by liquid distributor 47 in the stainless (steel) wire 482 in stainless steel reaction lining 481.
Claims (10)
1. one kind is reclaimed the method for struvite from mud, it is characterized in that: first in ultrasonic reaction pot, while stirring supersound process is carried out to thickened sludge, then barrier film plate-and-frame filter press is adopted to carry out solid-liquid separation process to the thickened sludge after described supersound process, obtain dehydrated sludge cake and filtrate, described dehydrated sludge cake outward transport is disposed, filtration unit carries out secondary filtration to described filtrate and obtains secondary filtrate, in Mg:P mol ratio (1.3 ~ 1.5) in struvite reaction retrieving arrangement: secondary filtrate mixes with magnesium source by the ratio of 1 carries out struvite reaction treatment, described struvite reacting treatment time controls at 2 hours, in described struvite reaction treatment process, struvite particle is from Precipitation in described secondary filtrate, the described struvite particle of precipitation is collected after struvite reaction treatment, secondary filtrate is back to sewage work and processes further.
2. a kind of method reclaiming struvite from mud according to claim 1, it is characterized in that: the acoustic density of described supersound process controls at 0.2W/mL ~ 0.5W/mL, ultrasonic time is 60 ~ 90 minutes.
3. a kind of method reclaiming struvite from mud according to claim 1, is characterized in that: after described secondary filtration, and the suspension content controlled in described secondary filtrate is down to below 10mg/L.
4. a kind of method reclaiming struvite from mud according to claim 1, it is characterized in that: when carrying out struvite reaction and reclaiming, synchronous pH value on-line monitoring is carried out to the reaction soln in struvite reaction retrieving arrangement, controls the pH value of reaction soln between 7.5 ~ 8.5.
5. from mud, reclaim a system for struvite, it is characterized in that: it comprises
Sludge thickener, for the concentrated collection of mud;
Sludge by Ultrasonic retort, for carrying out supersound process to thickened sludge, makes thickened sludge fragmentation cause cell rupture, promotes ICW and PO
4 3-release;
Barrier film plate-and-frame filter press, for carrying out solid-liquid separation to the thickened sludge after supersound process, is separated to obtain solid phase mud cake and liquid phase filtrate;
Filtration unit, carries out secondary filtration with to liquid phase filtrate, thus obtains secondary filtrate;
Struvite reaction retrieving arrangement, collects for carrying out struvite reaction to described secondary filtrate;
The discharge opening pipeline of described sludge thickener connects the opening for feed of described Sludge by Ultrasonic retort, the discharge gate pipeline of described Sludge by Ultrasonic retort connects the opening for feed of described barrier film plate-and-frame filter press, the filtrate outlet of described barrier film plate-and-frame filter press connects the fluid inlet of described struvite reaction retrieving arrangement by described filtration unit, described struvite reaction retrieving arrangement is provided with magnesium source and adds mouth, and the bottom of described struvite reaction retrieving arrangement is provided with leakage fluid dram and discharge gate valve.
6. a kind of system reclaiming struvite from mud according to claim 5, is characterized in that: be provided with ultrasonic generator and whipping appts in described Sludge by Ultrasonic retort.
7. a kind of system reclaiming struvite from mud according to claim 5, it is characterized in that: described struvite reaction retrieving arrangement comprises tank body and external circulation return pipe, reaction zone, top and negative area, bottom is provided with in described tank body, negative area, described bottom is back taper, liquid distributor is provided with between reaction zone, described top and negative area, bottom, described top is provided with reactor in reaction zone, mouth is added in described magnesium source, fluid inlet connects into described liquid distributor respectively by pipeline, the reaction zone, top of described tank body is provided with top circulation fluid refluxing opening and the import of bottom cycle liquid, described circulation return pipe and described top circulation fluid refluxing opening, bottom cycle liquid import respectively pipeline connects, described bottom cycle liquid inlet ductwork connects into described liquid distributor.
8. a kind of system reclaiming struvite from mud according to claim 7, it is characterized in that: described reactor comprises the stainless steel reaction lining of hollow, be filled with stainless (steel) wire in described stainless copper reaction lining, top, the bottom of described stainless steel reaction lining are respectively arranged with flow-stopping plate.
9. a kind of system reclaiming struvite from mud according to claim 8, it is characterized in that: the tank body of described struvite retrieving arrangement also connects acid solution case respectively, lye tank, and described tank body is provided with pH value on-line measuring device, described pH value on-line measuring device is used for the pH value detecting the secondary filtrate of reaction and the reaction soln in magnesium source in described tank body in real time, described acid solution case, the pH value of the reaction soln that lye tank detects according to described pH value on-line measuring device is thrown in acid solution or alkali lye thus is regulated the pH value of reaction soln between 7.5 ~ 8.5 in described tank body.
10. a kind of system reclaiming struvite from mud according to claim 9, it is characterized in that: described struvite retrieving arrangement is also provided with PLC control system, be arranged at that mouth, fluid inlet, leakage fluid dram, acid solution case, the by-pass valve control of lye tank and discharge gate valve are added in described magnesium source, circulation return pipe, pH value on-line measuring device electricly connect with described PLC control system respectively respectively.
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| CN107043199A (en) * | 2017-05-05 | 2017-08-15 | 河南恒安环保科技有限公司 | A kind of sewage disposal of hospital and its recovery method as resource |
| CN109020149A (en) * | 2018-09-15 | 2018-12-18 | 东莞理工学院 | A kind of sludge Resource recoveryization utilizes method and resource utilization device |
| CN110668536A (en) * | 2019-11-12 | 2020-01-10 | 上海莒纳新材料科技有限公司 | Water electrolysis equipment |
| CN112608005A (en) * | 2020-11-25 | 2021-04-06 | 湖南鑫远环境科技股份有限公司 | Method for recovering struvite from municipal sludge |
| CN114230115A (en) * | 2021-12-27 | 2022-03-25 | 东莞理工学院 | Efficient sludge conditioner and preparation method and application thereof |
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| CN114230115A (en) * | 2021-12-27 | 2022-03-25 | 东莞理工学院 | Efficient sludge conditioner and preparation method and application thereof |
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