CN220364449U - Pretreatment device for iron phosphate production wastewater - Google Patents
Pretreatment device for iron phosphate production wastewater Download PDFInfo
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- CN220364449U CN220364449U CN202321421705.1U CN202321421705U CN220364449U CN 220364449 U CN220364449 U CN 220364449U CN 202321421705 U CN202321421705 U CN 202321421705U CN 220364449 U CN220364449 U CN 220364449U
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- washing
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- 239000002351 wastewater Substances 0.000 title claims abstract description 30
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910000398 iron phosphate Inorganic materials 0.000 title claims abstract description 20
- 239000012452 mother liquor Substances 0.000 claims abstract description 238
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 223
- 238000005406 washing Methods 0.000 claims abstract description 108
- 238000001914 filtration Methods 0.000 claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 claims abstract description 51
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 49
- 238000007872 degassing Methods 0.000 claims abstract description 47
- 238000010517 secondary reaction Methods 0.000 claims abstract description 8
- 239000010802 sludge Substances 0.000 claims description 77
- 230000001105 regulatory effect Effects 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000011001 backwashing Methods 0.000 claims 1
- 239000003814 drug Substances 0.000 claims 1
- 239000012510 hollow fiber Substances 0.000 claims 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract description 18
- 235000011114 ammonium hydroxide Nutrition 0.000 abstract description 18
- 238000010276 construction Methods 0.000 abstract description 11
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 42
- 230000000694 effects Effects 0.000 description 20
- 239000002562 thickening agent Substances 0.000 description 20
- 229910021529 ammonia Inorganic materials 0.000 description 16
- 238000004062 sedimentation Methods 0.000 description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 12
- 238000000926 separation method Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 8
- 230000008025 crystallization Effects 0.000 description 8
- 239000005955 Ferric phosphate Substances 0.000 description 6
- 229940032958 ferric phosphate Drugs 0.000 description 6
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002686 phosphate fertilizer Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- 239000000618 nitrogen fertilizer Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052567 struvite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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- Removal Of Specific Substances (AREA)
Abstract
The utility model provides a pretreatment device for wastewater in iron phosphate production, and relates to the technical field of wastewater treatment. Specifically: the pretreatment device comprises a washing water pretreatment system and a mother liquor pretreatment system; the washing pretreatment system comprises a washing reaction module, a washing filtering module, a washing ultrafiltration module and a washing degassing module which are sequentially connected; the mother liquor pretreatment system comprises a mother liquor primary reaction module, a mother liquor primary filtration module, a mother liquor secondary reaction module, a mother liquor secondary filtration module, a mother liquor ultrafiltration module and a mother liquor degassing module which are sequentially connected. The pretreatment device has the advantages of small occupied area, high ammonia water utilization rate, high reaction efficiency, low subsequent treatment cost, short construction period, low construction investment and the like, and has good application prospect.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a pretreatment device for wastewater in iron phosphate production.
Background
At present, the pretreatment of wastewater from iron phosphate production mainly adopts a slaked lime chemical sedimentation method and an ammonia water chemical sedimentation method. Wherein, the chemical sedimentation method of slaked lime generates a large amount of calcium sulfate and calcium phosphate, and generates more solid waste. The ammonia water chemical sedimentation method adopts a stepwise sedimentation method for avoiding excessive ammonia water forming ammonia complex, but the stepwise sedimentation is easy to influence sedimentation effect; meanwhile, the technology uses the sedimentation tank as a mud-water separation device, has the defects of poor separation effect and secondary filtration of effluent, and generally needs to build a larger sedimentation tank and connect subsequent separation facilities, so that the investment cost is higher. In addition, the existing technology generally adopts an open system, ammonia leakage is serious, the ammonia water utilization rate is low, an odor treatment device or a matched ammonia absorption system is additionally required to be built, and the problem that the use amount of ammonia water and sulfuric acid is large due to the fact that sulfuric acid is adopted for neutralization in the odor treatment device is solved.
In view of this, the present utility model has been made.
Disclosure of Invention
The utility model aims to provide a device for treating iron phosphate production wastewater, which aims to overcome the defects of poor separation effect and secondary filtering of effluent caused by taking a sedimentation tank as a mud-water separation device in the existing step-by-step sedimentation, and has the advantages of small occupied area, high utilization rate of ammonia water, high reaction efficiency, low subsequent treatment cost, short construction period, low construction investment and the like.
In order to achieve the above object of the present utility model, the following technical solutions are specifically adopted:
a pretreatment device of wastewater in iron phosphate production comprises a water washing pretreatment system and a mother liquor pretreatment system;
the washing pretreatment system comprises a washing reaction module, a washing filtering module, a washing ultrafiltration module and a washing degassing module which are sequentially connected;
the mother liquor pretreatment system comprises a mother liquor primary reaction module, a mother liquor primary filtration module, a mother liquor secondary reaction module, a mother liquor secondary filtration module, a mother liquor ultrafiltration module and a mother liquor degassing module which are sequentially connected.
Compared with the prior art, the utility model has the beneficial effects that: the utility model is a mud-water separation device without sedimentation tank, the utility model adopts a closed system, no ammonia leakage exists, no matching ammonia absorption system is needed, the washing water and mother liquor are respectively treated by adopting a reaction module, a filtering module, an ultrafiltration module and a degassing module which are mutually parallel, the solid insoluble suspended matters, turbidity and sludge density in the waste water of ferric phosphate production are reduced, the separation effect is good, the washing water or mother liquor treated by the pretreatment equipment can be simply concentrated or evaporated to obtain pure water and salt products, the separation effect is good, and the recycling utilization can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an iron phosphate production wastewater pretreatment device provided by the utility model.
Reference numerals:
11-washing water reaction module;
111-a washing water regulating tank; 112-a wash water reactor;
113-washing water crystallizer; 114-washing water sludge concentration tank;
115-washing a water plate-and-frame filter press;
12-washing water filtering module;
13-a washing water ultrafiltration module;
14-a washing water degassing module;
141-washing water degasser; 142-a water pool in washing water;
21-a mother liquor primary reaction module;
211-a primary mother liquor regulating tank; 212-a mother liquor primary reactor;
213-mother liquor primary crystallizer; 214-a primary sludge concentration tank of mother liquor;
215-mother liquor primary plate-and-frame filter press;
22-a mother liquor primary filtration module;
23-a mother liquor secondary reaction module;
231-mother liquor secondary reactor; 232-a mother liquor secondary crystallizer;
233-a mother liquor secondary sludge concentration tank; 234-mother liquor secondary plate-and-frame filter press;
24-a mother liquor secondary filtering module;
25-mother liquor ultrafiltration module;
26-a mother liquor degassing module;
261-mother liquor degasser; 262-pond in mother liquor.
Detailed Description
The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present utility model, and are intended to be illustrative of the present utility model only and should not be construed as limiting the scope of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The utility model is realized by the following technical scheme: a pretreatment device of wastewater in iron phosphate production comprises a water washing pretreatment system and a mother liquor pretreatment system; the washing pretreatment system comprises a washing reaction module 11, a washing filtering module 12, a washing ultrafiltration module 13 and a washing degassing module 14 which are sequentially connected; the mother liquor pretreatment system comprises a mother liquor primary reaction module 21, a mother liquor primary filtration module 22, a mother liquor secondary reaction module 23, a mother liquor secondary filtration module 24, a mother liquor ultrafiltration module 25 and a mother liquor degassing module 26 which are sequentially connected.
The waste water in the production of the ferric phosphate refers to waste water produced in the production process of the ferric phosphate; the wastewater is discharged to other conventional water treatment procedures after passing through the wastewater pretreatment system, namely, is discharged to any conventional or non-conventional water treatment equipment, such as solid-liquid separation, evaporation concentration and the like, and is used for refining other inorganic matters in the wastewater or obtaining purified water.
In the present utility model, "wash water" in the "wash water pretreatment system" refers to sewage for washing iron phosphate products, and this part of sewage is named wash water or wash water:
the mother liquor in the mother liquor pretreatment system refers to residual mother liquor discharged from the ferric phosphate reaction kettle, and the part of sewage is named as mother liquor.
It should be noted that the difference between the water quantity and the water quality of the washing water and the mother liquor discharged from the production of the ferric phosphate is large, and the washing water pretreatment system and the mother liquor pretreatment system which are corresponding to each other are arranged in parallel in the utility model so as to realize the optimization of the treatment effect and the treatment efficiency.
The following will explain each functional module in the present utility model specifically; FIG. 1 provides a diagram of the wash pretreatment system and the mother liquor pretreatment system of the present utility model, and provides a possible structural relationship of the specific components or elements involved below.
A washing water pretreatment system;
(1) Wash water reaction module 11: comprises a washing water regulating tank 111, a washing water reactor 112 and a washing water crystallizer 113 which are sequentially connected, a washing water sludge concentration tank 114 which is connected with the washing water regulating tank 111, the washing water reactor 112 and the washing water crystallizer 113 at the same time, and a washing water plate-and-frame filter press 115 which is connected with the washing water sludge concentration tank 114; meanwhile, the water outlet of the washing water crystallizer 113 is connected with the washing water filtering module 12, and the liquid outlet of the washing water plate-and-frame filter press 115 flows back to the washing water regulating tank 111.
(1.1) a wash water regulating reservoir 111;
as a preferred embodiment, one or more of an air diffuser, a mud bucket, a mud pump, a lift pump, a liquid level sensor, a PH sensor, and a conductivity sensor are provided in the wash water adjusting tank 111; wherein, the air diffuser is arranged by a pontoon, and is arranged 0.5m below the liquid surface, thereby reducing the air diffusion resistance and the power of the degassing induced draft fan; the main pipe of the air diffuser is connected with the outlet of a degassing induced draft fan of the washing water degassing module 14; the lowest point of the sludge bucket is connected with an inlet pipe of a sludge discharge pump, and an outlet of the sludge discharge pump is connected with a water inlet pipe of a washing water sludge concentration tank 114; the bottom of the wash water adjusting tank 111 is provided with a pump pit and a lift pump, and the outlet of the lift pump is connected with the inlet of the wash water reactor 112.
Through setting up air diffuser and being used for absorbing the tail gas of follow-up degasification equipment, practiced thrift tail gas processing apparatus's construction cost and equipment area and retrieved a large amount of ammonia in the same time, on the other hand air diffuser plays the stirring effect in the equalizing basin, has prevented equalizing basin mud subsidence, and the equalizing basin can be regarded as another reactor in essence, has increased reaction effective time.
(1.2) a wash water reactor 112;
as a preferred embodiment, the wash water reactor 112 is provided with a closed reaction tank, and is provided with one or more of a stirrer, a pH controller, a discharging assembly and an ammonia adding assembly; as a more preferred embodiment, a plurality of reaction baffles are provided inside the wash water reactor 112 to enhance the mixing effect and improve the reaction efficiency.
During operation of the wash water reactor 112: the washing water is conveyed to a washing water reactor 112 through a lifting pump, a stirrer is started, ammonia water is added into a reaction tank, the adding amount of the ammonia water is controlled by a pH controller, and the pH is controlled to be 8-8.5; the residence time in the reaction tank is designed according to 15-30 min; the bottom discharge valve of the reaction tank is periodically opened to discharge excess sludge to the wash water sludge concentration tank 114.
The reaction equipment (comprising the washing water reactor 112, the mother liquor primary reactor 212 and the mother liquor secondary reactor 231) adopts a closed reaction tank, so that the leakage of ammonia gas is avoided, the environment is friendly, an odor treatment device is not required to be built, and the construction cost is saved; meanwhile, the reaction efficiency of the closed reaction tank is high, and more than 80 percent of occupied area is saved compared with the traditional open reaction sedimentation tank; the absence of an odor treatment device means that the addition amount of sulfuric acid is reduced, the total salt content of sewage is reduced, and the energy consumption of the subsequent treatment and separation steps is reduced.
(1.3) a wash water crystallizer 113;
as a preferred embodiment, the washing water crystallizer 113 adopts a closed crystallizer, and is provided with a stirrer and a discharging device; as a more preferable embodiment, a plurality of crystallization baffles are arranged in the crystallizer to strengthen the crystallization effect.
During the operation of the wash water crystallizer 113: the washing water enters a washing water crystallizer 113, a stirrer is started, and the residence time in the crystallizer is designed according to 1-2 h; the bottom discharge valve of the crystallizer is periodically opened to discharge excess sludge to the wash water sludge thickener 114.
(1.4) a wash water sludge thickener 114;
the backwash drain of the wash water sludge self-washing adjusting tank 111, the wash water reactor 112 and the wash water crystallizer 113 is connected to the water inlet of the wash water sludge concentration tank 114. As a preferred embodiment, the wash water sludge thickener 114 comprises a vertical flow sludge thickener, and overflow weirs.
During operation of the wash water sludge thickener 114: the residence time in the sludge concentration tank is designed according to 8-12 h, the sludge concentration effect is enhanced by a thickener, and after concentration is finished, the supernatant fluid flows back to the washing water regulating tank 111 through an overflow weir plate.
The sludge concentration modules (including the washing water sludge concentration tank 114, the mother liquor primary sludge concentration tank 214 and the mother liquor secondary sludge concentration tank 233) in the utility model can increase the reaction time and the treatment effect by adopting an overflow weir plate to enable overflow liquor to flow back to the regulating tank as supplementary ammonia water to react with the wastewater of the regulating tank.
(1.5) washing the water plate and frame filter press 115;
as a preferred embodiment, the wash water plate and frame filter press 115 comprises at least one group of plate and frame filter presses, with one or more of a plate and frame feed pump, a plate and frame press water system, or a plate and frame air blowback system; wherein the plate and frame feed pump is mounted to the bottom sludge discharge of the wash water sludge thickener 114.
When the washing machine plate and frame filter press 115 is operated: the sludge is pressurized by a plate and frame feeding pump and enters a plate and frame filter press, is squeezed by a plate and frame squeezing water system, and is back-blown by a gas back-blowing system to obtain a mud cake with the water content less than 50%; the mud cake is sold as a raw material of a phosphate fertilizer plant; the pressed filtrate flows back to the washing water adjusting tank 111; the back-blown muddy water is returned to the wash water sludge thickener 114.
The respective plate and frame filter press apparatuses (including the wash water plate and frame filter press 115, the mother liquor primary plate and frame filter press 215, and the mother liquor secondary plate and frame filter press 234) according to the present utility model increase the reaction time and the treatment effect by refluxing the filter press liquor to the regulating tank as make-up aqueous ammonia to react with the regulating tank wastewater.
(2) A wash water filtration module 12;
as a preferred embodiment, the wash water filtration module 12 comprises at least one stack of laminated filters, and a PLC controller, pressure sensor, flow sensor and automatic valve disposed in the laminated filters.
During operation of the wash water filtration module 12: the wastewater discharged from the wash water crystallizer 113 contains a large amount of suspended matters, and the SS value is up to 1000mg/L; suspended matters are removed through the interception function of the lamination filter; the filtering precision of the laminated filter is 100 mu m, and the produced water reaches the ultrafiltration water inflow index. Monitoring pressure parameters, pressure difference values, flow parameters and the like in real time through a PLC (programmable logic controller) to obtain a filtering state; when the filtering state does not meet the relevant regulations, water feeding is stopped, and a backwashing program is started.
The filtration modules (including the washing water filtration module 12, the mother liquor primary filtration module 22 and the mother liquor secondary filtration module 24) in the utility model all adopt lamination type filters to separate the reacted mixed liquor, thereby reducing the occupied area of the mixed liquor separation equipment and saving the investment.
(3) A wash water ultrafiltration module 13;
as a preferred embodiment, the wash water ultrafiltration module 13 comprises an ultrafiltration membrane stack, ultrafiltration backwash and related components involved in ultrafiltration cleaning.
During operation of the wash water ultrafiltration module 13: the washing water is processed by the washing water filtering module 12 and then is connected into an ultrafiltration inlet of the washing water ultrafiltration module 13; the produced water of the washing water ultrafiltration module 13 is connected to a degassing inlet of the washing water degassing module 14; the concentrated water of the washing water ultrafiltration module 13 flows back to the washing water regulating tank 111; after being treated by the washing water ultrafiltration module 13, the main index of the water quality is turbidity less than 1NTU, suspended matters less than 1mg/L and SDI less than 3.
(4) Wash water degasification module 14: comprises a washing water degasser 141 and a washing water middle water pool 142; the washing water ultrafiltration module 13 is connected with a water inlet of the washing water degasser 141, and the bottom of the washing water degasser 141 is connected with a washing water middle water pool 142.
The degassing modules (including the washing water degassing module 14 and the mother liquor degassing module 26) are all positioned at the rear end of ultrafiltration, so that the blocking problem of degassing equipment can be greatly reduced, meanwhile, the micro negative pressure degassing is beneficial to the removal of ammonia gas, the addition of ammonia water is reduced, a large amount of ammonia gas is recovered, and the addition amount of sulfuric acid in the reaction process is reduced.
(4.1) a wash water degasser 141;
as a preferred embodiment, an induced draft fan is provided at the top of the wash water degasser 141, and an outlet of the induced draft fan is connected with the wash water adjusting tank 111.
During operation of the wash water degasser 141: the washing water is connected to the upper water inlet of the washing water degassing tower 141 through the water outlet of the washing water ultrafiltration module 13, and is uniformly dispersed in the tower under the action of the water distribution nozzle; a second-stage cyclone plate is arranged in the tower; fresh air enters the tower from the V-shaped water inlet grid at the bottom, contacts with falling liquid drops, and ammonia gas escapes into a gas phase, and is in a micro negative pressure state in the tower under the action of an induced draft fan at the top of the degassing tower, and the ammonia gas is discharged from a washing water degassing tower 141 together with the air from the induced draft fan; ammonia gas discharged from the deaerator is absorbed by acidic water in the washed water regulating tank 111; the freely falling ammonia depleted wash water falls into the wash water basin 142.
(4.2) a sump 142 in the wash water;
as a preferred embodiment, the in-wash water reservoir 142 is provided with one or more of a pH sensor, a conductivity sensor or a level sensor.
The in-wash water pool 142 is the end point of the wash water pretreatment; the subsequent membrane concentration system and/or evaporation system can be connected, and the recovered pure water can be reused in a workshop, or the recovered ammonium salt can be used as nitrogenous fertilizer for sale.
(II) mother liquor pretreatment system
(1) Mother liquor primary reaction module 21: the device comprises a mother liquor primary regulating tank 211, a mother liquor primary reactor 212 and a mother liquor primary crystallizer 213 which are sequentially connected, a mother liquor primary sludge concentration tank 214 which is simultaneously connected with the mother liquor primary regulating tank 211, the mother liquor primary reactor 212 and the mother liquor primary crystallizer 213, and a mother liquor primary plate-and-frame filter press 215 which is connected with the mother liquor primary sludge concentration tank 214; the water outlet of the mother liquor primary crystallizer 213 is connected with the mother liquor primary filter module 22, and the liquid outlet of the mother liquor primary plate-and-frame filter press 215 flows back to the mother liquor primary regulating tank 211.
The sealed mother liquor primary reactor and the sealed mother liquor primary crystallizer are adopted, and the sealed mother liquor primary crystallizer is matched with a degassing system, so that the ammonia concentration of a reaction zone is improved, the reaction rate is accelerated, the treatment efficiency is improved, ammonia escape is reduced, ammonia water and sulfuric acid are saved, the occupied area of the system is reduced, the construction period is shortened, the construction cost is reduced, and the production environment is improved.
(1.1) a mother liquor primary regulating tank 211;
as a preferred embodiment, one or more of an air diffuser, a mud bucket, a mud pump, a lift pump, a liquid level sensor, a pH sensor, and a conductivity sensor are provided in the mother liquor primary adjusting tank 211; wherein, the air diffuser is arranged by a pontoon, and is arranged 0.5m below the liquid surface, thereby reducing the air diffusion resistance and the power of the degassing induced draft fan; the air diffuser main pipe is connected with the outlet of a degassing induced draft fan of the mother liquor degassing module 26; the lowest point of the sludge bucket is connected with an inlet pipe of a sludge pump, and an outlet of the sludge pump is connected with a water inlet pipe of the primary sludge concentration tank 214 of the 1 mother liquor; the inlet of the lift pump is connected with the bottom pump pit of the primary mother liquid regulating tank 211, and the outlet of the lift pump is connected with the inlet of the primary mother liquid reactor 212.
Through setting up air diffuser and being used for absorbing the tail gas of follow-up degasification equipment, practiced thrift tail gas processing apparatus's construction cost and equipment area and retrieved a large amount of ammonia in the same time, on the other hand air diffuser plays the stirring effect in the equalizing basin, has prevented equalizing basin mud subsidence, and the equalizing basin can be regarded as another reactor in essence, has increased reaction effective time.
(1.2) a mother liquor primary reactor 212;
as a preferred embodiment, the mother liquor primary reactor 212 employs a closed reaction tank with one or more of a stirring assembly, pH controller, discharge device and ammonia addition device.
In performing the operation of mother liquor primary reactor 212: the mother solution is conveyed to a closed reaction tank through a lifting pump, a stirrer is started, ammonia water is added into the reaction tank, and the adding amount of the ammonia water is controlled by a pH controller, so that the pH is controlled to be 5.5; the residence time of the mother solution in the reaction tank is designed according to 15-30 min; a plurality of reaction baffles are arranged in the reaction tank, so that the mixing effect is enhanced, and the reaction efficiency is improved; the bottom discharge valve of the reaction tank is periodically opened to discharge the excess sludge to the mother liquor primary sludge concentration tank 214.
(1.3) a mother liquor primary crystallizer 213;
as a preferred embodiment, the mother liquor primary crystallizer 213 adopts a closed crystallizer, and is provided with a stirrer and a discharging device; as a more preferable embodiment, a plurality of crystallization baffles are arranged in the crystallizer to strengthen the crystallization effect.
During the operation of the mother liquor primary crystallizer 213: the mother liquor is connected into a mother liquor primary crystallizer 213 from the water outlet of the mother liquor primary reactor 212, a stirrer is started, and the residence time in the crystallizer is designed according to 1-2 h; the crystallizer bottom discharge valve is periodically opened to discharge excess sludge to the mother liquor primary sludge thickener 214.
(1.4) a mother liquor primary sludge thickening tank 214;
the drain outlets of the mother liquor primary regulating tank 211, the mother liquor primary reactor 212 and the mother liquor primary crystallizer 213 are connected with the water inlet of the mother liquor primary sludge concentration tank 214. As a preferred embodiment, the mother liquor primary sludge thickener 214 includes a vertical flow sludge thickener, and overflow weirs.
In performing the operation of the mother liquor primary sludge thickener 214: the residence time in the sludge concentration tank is designed according to 8-12 h, the sludge concentration effect is enhanced through a thickener, and after concentration is finished, the supernatant fluid flows back to the 211 mother liquor primary regulating tank through an overflow weir plate.
(1.5) a mother liquor first stage plate and frame filter press 215;
as a preferred embodiment, the mother liquor primary plate and frame filter press 215 comprises at least one group of plate and frame filter presses, and one or more of a plate and frame feed pump, a plate and frame squeeze water system or a plate and frame air back-flushing system is arranged at the same time; wherein the plate and frame feed pump is mounted at the bottom sludge discharge port of the primary sludge thickener 214.
When the operation of the mother liquor primary plate and frame filter press 215 is performed: the sludge is pressurized by a plate and frame feeding pump and enters a plate and frame filter press, is squeezed by a plate and frame squeezing water system, and is back-blown by a gas back-blowing system to obtain a mud cake with the water content less than 50%; the mud cake is sold as a raw material of a phosphate fertilizer plant; the pressed filtrate is refluxed to the mother liquor primary adjusting tank 211; the back-blown sludge water is returned to the mother liquor primary sludge thickener 214.
(2) A mother liquor primary filtration module 22;
as a preferred embodiment, the mother liquor primary filtration module 22 includes at least one stack of laminated filters, as well as a PLC controller, pressure sensor, flow sensor and automatic valve disposed within the laminated filters.
In performing the operation of the mother liquor primary filtration module 22: the wastewater discharged from the mother liquor primary crystallizer 213 contains a large amount of suspended matters, wherein the main components of SS generated by the mother liquor primary crystallizer 213 are ferric hydroxide, calcium hydrophosphate and ferric phosphate, and the SS value is up to 1000mg/L; suspended matters are removed through the interception effect of the laminated filter, and discharged SS is smaller than 20mg/L. Monitoring pressure parameters, pressure difference values, flow parameters and the like in real time through a PLC (programmable logic controller) to obtain a filtering state; when the filtering state does not meet the relevant regulations, water feeding is stopped, and a backwashing program is started.
(3) Mother liquor secondary reaction module 23: comprises a mother liquor secondary reactor 231 and a mother liquor secondary crystallizer 232 which are connected in sequence, a mother liquor secondary sludge concentration tank 233 which is connected with the mother liquor secondary reactor 231 and the mother liquor secondary crystallizer 232 at the same time, and a mother liquor secondary plate-and-frame filter press 234 which is connected with the mother liquor secondary sludge concentration tank 233; meanwhile, the water outlet of the mother liquor secondary crystallizer 232 is connected with the mother liquor secondary filtering module 24, and the liquid outlet of the mother liquor secondary plate-and-frame filter press 234 returns to the mother liquor primary regulating tank 211.
The sealed mother liquor secondary reactor and the sealed mother liquor secondary crystallizer are adopted, and the degassing system is matched, so that the ammonia concentration of a reaction zone is improved, the reaction rate is accelerated, the treatment efficiency is improved, ammonia escape is reduced, the use of ammonia water and sulfuric acid is saved, the occupied area of the system is reduced, the construction period is shortened, the construction cost is reduced, and the production environment is improved.
(3.1) a mother liquor secondary reactor 231;
as a preferred embodiment, the mother liquor secondary reactor 231 is provided with a closed reaction tank, and is provided with one or more of a stirrer, a pH controller, a discharging assembly and an ammonia adding assembly; as a more preferable embodiment, a plurality of reaction baffles are provided inside the mother liquor secondary reactor 231 to enhance the mixing effect and improve the reaction efficiency.
During operation of the mother liquor secondary reactor 231: the mother liquor is connected into a mother liquor secondary reactor 231 through a water outlet of a mother liquor primary filtering module 22, a stirrer is started, ammonia water is added into a reaction tank, the adding amount of the ammonia water is controlled by a pH controller, and the pH is controlled at 8.5; the residence time in the reaction tank is designed according to 15-30 min; the discharge valve at the bottom of the reaction tank is periodically opened to discharge more sludge to the mother liquor secondary sludge concentration tank 233.
(3.2) a mother liquor secondary crystallizer 232;
as a preferred embodiment, the mother liquor secondary crystallizer 232 adopts a closed crystallizer, and is provided with a stirrer and a discharging device; as a more preferable embodiment, a plurality of crystallization baffles are arranged in the crystallizer to strengthen the crystallization effect.
During operation of mother liquor secondary crystallizer 232: the mother liquor is connected into a mother liquor secondary crystallizer 232 from the water outlet of the mother liquor secondary reactor 231, a stirrer is started, and the residence time in the crystallizer is designed according to 1-2 h; and periodically opening a bottom discharge valve of the crystallizer to discharge the residual sludge to the mother liquor secondary sludge concentration tank 233.
(3.3) a mother liquor secondary sludge concentration tank 233;
the mother liquor sludge is connected from the backwash drain outlet of the mother liquor secondary reactor 231 and the mother liquor secondary crystallizer 232 to the water inlet of the mother liquor secondary sludge concentration tank 233. As a preferred embodiment, the mother liquor secondary sludge thickener 233 includes a vertical flow sludge thickener, a thickener, and an overflow weir.
When the operation of the mother liquor secondary sludge concentration tank 233 is performed: the residence time in the sludge concentration tank is designed according to 8-12 h, the sludge concentration effect is enhanced by a thickener, and after concentration is finished, the supernatant fluid flows back to the mother liquor primary regulating tank 211 through an overflow weir plate.
(3.4) a mother liquor secondary plate and frame filter press 234;
as a preferred embodiment, the mother liquor secondary plate and frame filter press 234 comprises at least one group of plate and frame filter presses, with one or more of a plate and frame feed pump, a plate and frame press water system, or a plate and frame air blowback system; wherein, the plate frame feed pump is arranged at the bottom sludge discharge port of the mother liquor secondary sludge concentration tank 233.
When the operation of the mother liquor secondary plate and frame filter press 234 is performed: the sludge is pressurized by a plate and frame feeding pump and enters a plate and frame filter press, is squeezed by a plate and frame squeezing water system, and is back-blown by a gas back-blowing system to obtain a mud cake with the water content less than 50%; the mud cake is sold as a raw material of a phosphate fertilizer plant; the pressed filtrate is refluxed to the mother liquor primary adjusting tank 211; the back-blown sludge water is returned to the mother liquor primary sludge thickener 214.
(4) A mother liquor secondary filtration module 24;
as a preferred embodiment, the mother liquor secondary filtration module 24 includes at least one stack of laminated filters, as well as a PLC controller, pressure sensor, flow sensor and automatic valve disposed within the laminated filters.
During operation of the mother liquor secondary filtration module 24: the wastewater discharged from the mother liquor secondary crystallization module 232 contains a large amount of suspended matters, wherein SS of the water produced by the secondary reaction crystallization is mainly magnesium ammonium phosphate, and the SS value is up to 1000mg/L; by interception through the laminated filter, suspended matter is removed, and the effluent SS of the mother liquor secondary filter module 24 is less than 20mg/L. Monitoring pressure parameters, pressure difference values, flow parameters and the like in real time through a PLC (programmable logic controller) to obtain a filtering state; when the filtering state does not meet the relevant regulations, water feeding is stopped, and a backwashing program is started.
(5) A mother liquor ultrafiltration module 25;
as a preferred embodiment, the mother liquor ultrafiltration module 25 comprises an ultrafiltration membrane stack, ultrafiltration backwash and related components involved in ultrafiltration cleaning.
During operation of the mother liquor ultrafiltration module 25: the mother liquor is processed by the mother liquor secondary filtering module 24 and then is connected into an ultrafiltration inlet of the mother liquor ultrafiltration module 25; the produced water of the mother liquor ultrafiltration module 25 is connected into a degassing inlet of the mother liquor degassing module 26; the concentrated water of the mother liquor ultrafiltration module 25 flows back to the mother liquor primary adjusting tank 211; after the treatment by the mother liquor ultrafiltration module 25, the main index of the water quality is turbidity less than 1NTU, suspended matters less than 1mg/L and SDI less than 3.
(6) Mother liquor degassing module 26: comprises a mother liquor degasser 261 and a mother liquor water pond 262; the mother liquor ultrafiltration module 25 is connected with a water inlet of the mother liquor degasser 261, and the bottom of the mother liquor degasser 261 is connected with a water pond 262 in the mother liquor.
(6.1) a mother liquor degasser 261;
as a preferred embodiment, an induced draft fan is arranged at the top of the mother liquor degasser 261, and the outlet of the induced draft fan is connected with the mother liquor primary adjusting tank 211.
In performing the operation of the mother liquor degasser 261: mother liquor is connected to the upper water inlet of the mother liquor degasser 261 through the water outlet of the mother liquor ultrafiltration module 25, and is uniformly dispersed in the tower under the action of the water distribution nozzle; a second-stage cyclone plate is arranged in the tower; fresh air enters the tower from the V-shaped water inlet grid at the bottom, contacts with falling liquid drops, and ammonia gas escapes into a gas phase, and is in a micro negative pressure state in the tower under the action of the induced draft fan at the top of the degassing tower, and the ammonia gas is discharged out of the mother liquor degassing tower 261 along with the air from the induced draft fan; ammonia gas at the outlet of the degassing induced draft fan is absorbed by acid water in the mother liquor primary adjusting tank 211; the free-falling ammonia depleted mother liquor falls into a mother liquor pond 262.
(6.2) a pool 262 of mother liquor;
as a preferred embodiment, the sump 262 in the mother liquor is provided with one or more of a pH sensor, conductivity sensor or level sensor.
The pond 262 in the mother liquor is the end point of the pretreatment of the mother liquor; and the subsequent membrane concentration system and/or evaporation system can be connected, pure water is recovered and recycled to a workshop, and ammonium salt is recovered and sold as nitrogen fertilizer.
While the utility model has been illustrated and described with reference to specific embodiments, it is to be understood that the above embodiments are merely illustrative of the technical aspects of the utility model and not restrictive thereof; those of ordinary skill in the art will appreciate that: modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some or all of the technical features thereof, without departing from the spirit and scope of the present utility model; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; it is therefore intended to cover in the appended claims all such alternatives and modifications as fall within the scope of the utility model.
Claims (10)
1. The pretreatment device for the wastewater in the iron phosphate production is characterized by comprising a water washing pretreatment system and a mother liquor pretreatment system;
the washing pretreatment system comprises a washing reaction module, a washing filtering module, a washing ultrafiltration module and a washing degassing module which are sequentially connected;
the mother liquor pretreatment system comprises a mother liquor primary reaction module, a mother liquor primary filtration module, a mother liquor secondary reaction module, a mother liquor secondary filtration module, a mother liquor ultrafiltration module and a mother liquor degassing module which are sequentially connected.
2. The pretreatment device for wastewater from iron phosphate production according to claim 1, wherein the wash water reaction module comprises a wash water regulating tank, a wash water reactor and a wash water crystallizer which are sequentially connected, a wash water sludge concentration tank which is connected with the wash water regulating tank, the wash water reactor and the wash water crystallizer at the same time, and a wash water plate-and-frame filter press which is connected with the wash water sludge concentration tank;
the water outlet of the washing water crystallizer is connected with the washing water filtering module, and the liquid outlet of the washing water plate-and-frame filter press flows back to the washing water regulating tank.
3. The pretreatment device for wastewater from iron phosphate production according to claim 2, wherein the washing water degassing module comprises a washing water degassing tower and a washing water pond;
the washing water ultrafiltration module is connected with a water inlet of the washing water degassing tower, and the bottom of the washing water degassing tower is connected with the washing water reclaimed water tank;
an induced draft fan is arranged at the top of the washing water degassing tower, and an outlet of the induced draft fan is connected with the washing water regulating tank.
4. The pretreatment device of waste water from iron phosphate production according to claim 2, wherein the primary reaction module comprises a primary regulating tank, a primary reactor and a primary crystallizer, which are connected in sequence, a primary sludge concentration tank connected with the primary regulating tank, the primary reactor and the primary crystallizer, and a primary plate-and-frame filter press connected with the primary sludge concentration tank;
the water outlet of the primary mother liquor crystallizer is connected with the primary mother liquor filtering module, and the liquid outlet of the primary mother liquor plate-and-frame filter press flows back to the primary mother liquor regulating tank.
5. The pretreatment device for wastewater from iron phosphate production according to claim 4, wherein the mother liquor secondary reaction module comprises a mother liquor secondary reactor and a mother liquor secondary crystallizer which are sequentially connected, a mother liquor secondary sludge concentration tank which is simultaneously connected with the mother liquor secondary reactor and the mother liquor secondary crystallizer, and a mother liquor secondary plate-and-frame filter press which is connected with the mother liquor secondary sludge concentration tank;
and the water outlet of the mother liquor secondary crystallizer is connected with the mother liquor secondary filtering module, and the liquid outlet of the mother liquor secondary plate-and-frame filter press flows back to the mother liquor primary regulating tank.
6. The pretreatment device for wastewater in iron phosphate production according to claim 4, wherein the mother liquor degassing module comprises a mother liquor degassing tower and a pond in the mother liquor;
the mother liquor ultrafiltration module is connected with a water inlet of the mother liquor degassing tower, and the bottom of the mother liquor degassing tower is connected with a water tank in the mother liquor;
the top of mother liquor degasser is provided with the draught fan, just the export of draught fan with mother liquor one-level equalizing basin is connected.
7. The pretreatment device of waste water from iron phosphate production according to claim 1, wherein the washing water filtration module, the mother liquor primary filtration module or the mother liquor secondary filtration module is independently provided with at least one stack of laminated filters;
the washing water filtering module, the mother liquor primary filtering module or the mother liquor secondary filtering module are independently provided with a PLC controller, a sensor and an automatic valve; the sensor includes at least one of a pressure sensor and a flow sensor.
8. The pretreatment device for wastewater from iron phosphate production according to claim 1, wherein the washing water ultrafiltration module and the mother liquor ultrafiltration module are independently provided with one of an external pressure type hollow fiber ultrafiltration membrane or a roll type ultrafiltration membrane;
the washing water ultrafiltration module and the mother liquor ultrafiltration module are also independently provided with an ultrafiltration backwashing system and an ultrafiltration cleaning component.
9. The pretreatment device for wastewater from iron phosphate production according to claim 5, wherein the washing water reactor, the mother liquor primary reactor and the mother liquor secondary reactor are closed reaction vessels;
the washing water reactor, the mother liquor primary reactor and the mother liquor secondary reactor are independently provided with a water inlet, a medicine adding port, a water outlet, a discharge port and an exhaust port; the water inlet is arranged in the middle of the side wall of the reactor, the water outlet is arranged on the upper part of the side wall opposite to the water inlet, the discharge opening is arranged at the bottom of the reactor, and the exhaust opening is arranged at the top of the reactor.
10. The pretreatment device for wastewater from iron phosphate production according to claim 5, wherein the washing water crystallizer, the mother liquor primary crystallizer and the mother liquor secondary crystallizer are closed type crystallizers;
the washing water crystallizer, the mother liquor primary crystallizer and the mother liquor secondary crystallizer are independently provided with a second water inlet, a second water outlet, a second discharge port and a second exhaust port; the second water inlet is arranged in the middle of the side wall of the crystallizer, the second water outlet is arranged on the upper part of the side wall opposite to the second water inlet, the second discharge opening is arranged at the bottom of the crystallizer, and the second exhaust opening is arranged at the top of the crystallizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321421705.1U CN220364449U (en) | 2023-06-05 | 2023-06-05 | Pretreatment device for iron phosphate production wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321421705.1U CN220364449U (en) | 2023-06-05 | 2023-06-05 | Pretreatment device for iron phosphate production wastewater |
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| CN220364449U true CN220364449U (en) | 2024-01-19 |
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| CN202321421705.1U Active CN220364449U (en) | 2023-06-05 | 2023-06-05 | Pretreatment device for iron phosphate production wastewater |
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