CN108217620A - A kind of method for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite - Google Patents
A kind of method for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite Download PDFInfo
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- CN108217620A CN108217620A CN201810012816.4A CN201810012816A CN108217620A CN 108217620 A CN108217620 A CN 108217620A CN 201810012816 A CN201810012816 A CN 201810012816A CN 108217620 A CN108217620 A CN 108217620A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The present invention relates to a kind of methods for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite；The colloid and particulate matter in seawater are removed first；Seawater is by three sections of nanofiltration systems, and the concentrated water of generation is as magnesium source；The concentrated water magnesium source generated after nanofiltration is handled into alkaline chemical precipitation system, removes part Ca2+；The supernatant of settling system and anaerobic fermented liquid and lye are added in into guanite preparation system again, generate guanite precipitation.Magnesium source is prepared into using three sections of nanofiltration systems using cheap seawater, especially offshore area, in terms of long-term development angle, greatly reduces and prepares the cost in magnesium source that guanite is added；It goes to denitrogenate phosphorus by using the method for guanite, can both remove nitrogen and phosphorus element, reduce the harm to environment, can also realize recycling, as slow-release fertilizer, potato can be made to increase production 40%.The anaerobic fermented liquid of excess sludge is gone after denitrogenating phosphorus, and the carbon source for being also used as sewage treatment plant carries out reuse, is reduced influence of the nitrogen phosphorus to system, is reduced processing cost etc..
Description
Technical field
The present invention relates to the nitrogen phosphorus recycled in a kind of wastewater treatment process in anaerobic fermented liquid, are prepared by adding magnesium source
A kind of method of guanite, more particularly to method for preparing magnesium source by three sections of nanofiltration systems using seawater.
Background technology
During reuse of the municipal excess sludge anaerobic fermented liquid as sewage disposal carbon source, studies have found that remaining dirty
Ammonia-nitrogen content in mud anaerobic fermented liquid is about 150mg/L, phosphorus about 160mg/L；In pig breeding farm biogas slurry, ammonia-nitrogen content is about
200~2000mg/L, phosphorus content are about 20~400mg/L；In landfill leachate, ammonia-nitrogen content about 100~3000mg/L, phosphorus contains
Measure about 1~70mg/L etc..Nitrogen and phosphorus content is higher in anaerobic fermented liquid, if cannot deal carefully with, environment can be caused secondary
Pollution.Extra nitrogen phosphorus can be formed guanite by adding magnesium source to recycle in the form of precipitating, then can both reduced
The negative effect that zymotic fluid is brought as carbon source reuse to treatment process, and realize recycling.Guanite (MgNH4PO4﹒
6H2O, i.e. MAP) make a kind of white crystal for being insoluble in water, positive diamond structure contains nitrogen, phosphorus, magnesium three necessary to plant growth
Kind of nutrient is a kind of known and application multielement slow release fertilizer, using guanite precipitation as slow release fertilizer, not only fertility
Height, also as being multi-element fertilizer, utilization rate is greatly promoted compared with single chemical fertilizer.How much no matter apply fertilizer, be all not in due to battalion
Support element accumulation and caused by crop calcination phenomenon, while guanite will not adsorb the heavy metal element in soil, in fertilising not
Crops can be injured.In addition, it is also used as feed addictive, chemical reagent, structural articles fire retardant chemical etc..Research is found can
Potato is made to increase production 42%.
Preparing guanite needs to add magnesium source in the process, and there are many source of magnesium, commonly use magnesium chloride and magnesium hydroxide etc., the latter
Magnesium source is served not only as, also undertakes the important task for adjusting pH, but usually throwing ratio should not control, and during the dissolving of magnesium hydroxide needs
Between it is very long；Although and magnesium chloride is not slow, cost is very high.If a kind of method can be taken to reduce the cost in magnesium source, gesture
It must make the method for denitrogenating phosphorus to be gone to be applied more extensively using guanite method.And the magnesium ion content average value in seawater reaches
1280mg/L, how magnesium ion from the seawater of the counter anion containing relative harmless (chlorion about 20000mg/L,
Sodium ion about 11000mg/L) separate be a very challenging property work.
Nanofiltration-membrane technique is a kind of novel membrane separation technique most to grow up during the nearly last ten years, and NF membrane is due to its spy
Different pore diameter range and the specially treated (such as Composite, chargedization) prepared cause NF membrane to have more special separation property
Can, there is higher removing performance to the organic matter of divalent and multivalent ion and molecular weight between (200~1000), and to unit price
Ion and the removal efficiency of small molecule are then relatively low.Most NF membranes are electrically charged, utilize the special ion isolation performance of NF membrane
It can realize divalent and the relative separation of monovalent ion in seawater, the rejection size order to ion is：SO4 2->Mg2+>Ca2+
>Na+>Cl-。
Research of the Nanofiltration-membrane technique in sea water desalination and water purification field is relatively more, in field of seawater desalination, generally as
The hardness of seawater and the content of TDS can be greatly lowered in pretreatment, and it is dirty to solve fouling present in traditional desalting process
The problems such as dye；Then be mainly used in water purification field high-quality advanced treating, the advanced treating of town water supply of town regenerated water with
And in terms of household water filter, wherein the disposition of the concentrated water generated is always the difficult point and hot spot of research.And utilize Nanofiltration-membrane technique
Seawater is handled, the concentrated water of generation is as magnesium source, while the correlation for removing the generation guanite precipitation of the nitrogen phosphorus in anaerobic fermented liquid is ground
Study carefully seldom；The type selecting of film plays the role of the concentration and quantity of the concentrated water of generation very crucial again, and relevant report is less, receives
The development of filter film technology is also being constantly updated.The present invention selects Nanofiltration-membrane technique to carry out processing seawater, in order to obtain high-content
Magnesium source, select Mg2+Ion remaval rate is high, Ca2+Removal rate compares relatively low, the high NF membrane product of the production water rate of recovery.
Invention content
The present invention relates to the costs that a kind of reduction prepares magnesium source needed for guanite, can utilize the magnesium ion in seawater nearby
As magnesium source, a kind of method for preparing magnesium source is provided；Then it adds in anaerobic fermented liquid, is formed according to a certain percentage with nitrogen phosphorus
Guanite precipitates, and is subject to recycling.Using seawater cheap and easy to get by pretreatment and three sections of nanofiltration systems, NF membrane is adopted
With low pressure NF membrane, model DF8040-R30/365, water yield 37.5m3/ d, magnesium sulfate salt rejection rate >=97%, calcium chloride
Salt rejection rate 30~50%, sodium chloride salt rejection rate 30%~50%, the production water rate of recovery 75%~90%, the concentrated water of preparation is as magnesium
Source.Again by alkaline chemical precipitation system, reduce Ca2+Influence to guanite precipitation.Supernatant and lye, anaerobic fermentation after precipitation
Liquid adds in guanite preparation system and is carried out according to optimum reaction condition, obtains guanite precipitation.
Technical scheme is as follows:
A kind of method for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite, at least by following process group
Into：
1) colloid and particulate matter in seawater are removed；
2) seawater is by three sections of nanofiltration systems, and the concentrated water of generation is as magnesium source；
3) the concentrated water magnesium source generated after nanofiltration is handled into alkaline chemical precipitation system, removes part Ca2+；
4) supernatant of settling system and anaerobic fermented liquid and lye are added in into guanite preparation system, generates guanite
Precipitation.
Step 1) the seawater, will by high-pressure pump after pretreatment system more medium filter and cartridge filter processing
Seawater is pumped into nanofiltration system.
Described three sections of nanofiltration systems of step 2), the water inlet of the concentrated water of first segment as second segment, the concentrated water conduct of second segment
The water inlet of third section, the membrane component quantity of back segment pressure vessel are fewer than the membrane component quantity of the preceding paragraph.
The pressure vessel arrangement of preferably three sections nanofiltration systems of the step 2) is than being 4:2:1.
It is preferred that the filter medium of medium filter uses quartz sand and activated carbon, by the way of pressure filtration.
It is preferred that the filter core aperture of the cartridge filter is 5 μm, make water outlet siltation index SDI<5.
It is preferred that select NF membrane DF8040-R30/365, MgSO4Salt rejection rate >=97%, CaCl2Salt rejection rate 30%~50%,
NaCl salt rejection rates 30%~50%, the production water rate of recovery 75%~90%, concentrated water return to sea as magnesium source, fresh water.
It is preferred that plus-minus settling system is by adding in the Mg in the concentrated water of lye sodium hydroxide and three sections of nanofiltration systems generations2 +、Ca2+Ion is reacted, and removes a part of calcium ion, reduces the influence precipitated to guanite.
It is preferred that guanite preparation system is by adding in anaerobic fermented liquid and magnesium source and adjusting the lye hydroxide of pH
Sodium, according to pH be 8~11, Mg/N is 1.0~2.0：1st, P/N=0.7~1.3, mixing time 2min~5min reaction condition
It carries out, is prepared into guanite and adds.
Additional carbon or other application after the supernatant recycling of guanite preparation system as sewage treatment plant.
It is described as follows：
Rich in magnesium ion in seawater, average value 1280mg/L, while the content of marine calcium ion about 400~
500mg/L.The colloid and particulate matter in seawater are removed by more medium filter 1 and cartridge filter 2 first, then passes through height
Seawater is pumped into three sections of nanofiltration systems 4 by press pump 3, and three sections of nanofiltration systems 4 select NF membrane DF8040-R30/365, and fresh water returns to
Sea, magnesium ion content is about 12416mg/L in the concentrated water of generation, and calcium ion content is about 1200mg/L；In alkaline chemical precipitation system
Sodium hydroxide solution is added in system 6, place to go part calcium ion, obtains the magnesium ion that final content is about 10g/L to a certain extent
Solution.Anaerobic fermented liquid, magnesium source and lye add in guanite preparation system 5, and according to pH be 8~11, Mg/N is 1.0~2.0：1、
P/N=0.7~1.3, the reaction condition progress of mixing time 2min~5min, finally obtain guanite precipitation, ammonia nitrogen removal frank
75%~90%, tp removal rate 70~88%.The purity of guanite will be different according to anaerobic fermented liquid of different nature, and one
As be more than 70%, the supernatant of generation or be back to use sewage treatment plant as carbon source or make other application according to actual conditions.
The invention has the advantages that using cheap seawater, especially offshore area is prepared using three sections of nanofiltration systems
Into magnesium source, in terms of long-term development angle, greatly reduce and prepare the cost in magnesium source that guanite is added；By using bird
The method of coprolite goes to denitrogenate phosphorus, can both remove nitrogen and phosphorus element, reduces the harm to environment, can also realize recycling profit
With as slow-release fertilizer, potato being made to increase production 40%.The anaerobic fermented liquid of excess sludge goes after denitrogenating phosphorus, is also used as dirt
The carbon source of water treatment plant carries out reuse, reduces influence of the nitrogen phosphorus to system, reduces processing cost etc..
Description of the drawings
Fig. 1：A kind of process schematic representation for using sea water as magnesium source processing anaerobic fermented liquid and preparing the method for guanite.
1. more medium filter, 2. cartridge filters, 3. high-pressure pumps, 4. 3 sections of nanofiltration systems, 5. guanite preparation systems,
6. alkaline chemical precipitation system.
Specific embodiment
This method suitable for anaerobic fermented liquid the higher waste liquid of nitrogen and phosphorus content using guanite precipitation method into
Row recovery of nitrogen and phosphorus, especially to offshore area, required magnesium source is prepared using seawater, and preparation method uses three sections of nanofiltration systems
It is prepared.Obtained magnesium source content is high, and purity is high, reduces the cost of magnesium source buying.
The present invention is further described below in conjunction with attached drawing 1 and embodiment：
A kind of method for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite as shown in Figure 1, including pre-
Processing, nanofiltration system, alkaline chemical precipitation system and guanite preparation system.
The pretreatment includes more medium filter 1 and cartridge filter 2.The filter medium of more medium filter 1 uses
Quartz sand and activated carbon, by the way of pressure filtration；The filter core aperture of cartridge filter 2 is 5 μm, makes water outlet siltation index
SDI<5。
The nanofiltration system includes high-pressure pump 3 and three sections of nanofiltration systems 4.Three sections of nanofiltrations be 4 pressure vessel arrangement ratio be
4:2：1；NF membrane selects DF8040-R30/365, MgSO4Salt rejection rate >=97%, CaCl2Salt rejection rate 30%~50%, NaCl takes off
Salt rate 30%~50%, the production water rate of recovery 75%~90%.
1 upper entering and lower leaving of more medium filter, pipeline out are connected to 2 top of cartridge filter, cartridge filter 2
It is pumped into three sections of nanofiltration systems 4 by high-pressure pump 3 from following pipeline out, concentrated water flows into alkaline chemical precipitation system 6 by the road
In, fresh water collects through water producing pipe and returns to sea, and the supernatant through alkaline chemical precipitation system 6 is pumped into guanite with dosing pump and prepares
System 5, guanite preparation system 5 precipitation guanite discharge as slow-release fertilizer it is spare, supernatant can be used as carbon source reuse or
Other application.
A kind of method for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite, at least by following process group
Into：
5) colloid and particulate matter in seawater are removed；
6) seawater is by three sections of nanofiltration systems, and the concentrated water of generation is as magnesium source；
7) the concentrated water magnesium source generated after nanofiltration is handled into alkaline chemical precipitation system, removes part Ca2+；
8) supernatant of settling system and anaerobic fermented liquid and lye are added in into guanite preparation system, generates guanite
Precipitation.
Including pretreatment system, nanofiltration system, alkaline chemical precipitation system 6 and guanite preparation system 5, seawater is by pretreatment
After system more medium filter 1 and cartridge filter 2 are handled, seawater is pumped into nanofiltration system by high-pressure pump 3, nanofiltration system uses
Three sections of nanofiltration systems 4, the concentrated water of generation add in guanite preparation system 5 and form guanite after the processing of alkaline chemical precipitation system 6
Precipitation.
The method of colloid and particulate matter in the removal seawater, it is characterized in that seawater is by more medium filter 1 and protects
Pacify filter 2, colloid and particulate pollutant in removal water inlet.The filter medium of the more medium filter 1 uses quartz sand
And activated carbon, by the way of pressure filtration；The filter core aperture of the cartridge filter 2 is 5 μm, makes water outlet siltation index SDI<
5。
Three sections of nanofiltration systems 4, it is characterized in that water inlet of the concentrated water of first segment as second segment, the concentrated water of second segment is made
For the water inlet of third section, in order to ensure normal flow of inlet water, fouling membrane speed is reduced, ensures the service life of film, back segment
Membrane component quantity is fewer than the membrane component quantity of the preceding paragraph, and typical pressure vessel arrangement is than being 4:2:1.Select NF membrane
DF8040-R30/365, MgSO4Salt rejection rate >=97%, CaCl2Salt rejection rate 30%~50%, NaCl salt rejection rates 30%~50%, production
The water rate of recovery 75%~90%, concentrated water return to sea as magnesium source, fresh water.
The plus-minus settling system 6, it is characterized in that by adding in lye sodium hydroxide and three sections of nanofiltration systems 4 generate
Mg in concentrated water2+、Ca2+Ion is reacted, and removes a part of calcium ion, reduces the influence precipitated to guanite.
The guanite preparation system 5, it is characterized in that by adding in anaerobic fermented liquid and magnesium source and adjusting pH's
Lye sodium hydroxide, according to pH be 8~11, Mg/N is 1.0~2.0：1st, P/N=0.7~1.3, mixing time 2min~5min
Reaction condition carry out, be prepared into guanite and be used.
Embodiment 1：
Guanite preparation system according to pH is 8, Mg/N 1.9：1st, P/N=0.7, mixing time 2min reaction condition into
During row：
By taking the excess sludge anaerobic fermented liquid of the sewage treatment plant of offshore place day 50,000 tons of sewage of processing as an example, generate daily
About 300 tons of excess sludge, wherein 10 tons of excess sludge is subjected to anaerobic fermentation, ammonia-nitrogen content is 150mg/L in zymotic fluid,
Phosphorus content is 160mg/L.As shown in Figure 1, colloid and particulate matter are removed by more medium filter 1 and cartridge filter 2 first,
Then seawater is pumped into three sections of nanofiltration systems 4 with high-pressure pump 3 and handles seawater and prepare magnesium source, MgSO4Salt rejection rate >=97%, CaCl2It is de-
Salt rate 30%~50%, NaCl salt rejection rates 30%~50%, the production water rate of recovery 75%~90%, concentrated water is returned as magnesium source, fresh water
Go back to sea.Magnesium ion content is about 12416mg/L in the concentrated water of generation, and calcium ion content is about 1200mg/L；In alkaline chemical precipitation
System 6 adds in sodium hydroxide solution, and place to go part calcium ion, obtains the magnesium ion that final content is about 10g/L to a certain extent
Solution.According to pH it is 8 in guanite preparation system 5, Mg/N 1.9：1st, P/N=0.7, mixing time 2min reaction conditions into
Row, need to add magnesium source about 4000g, and using about 0.45 ton of seawater, i.e., 10 tons of anaerobic fermented liquid needs about 0.45 ton of seawater
Prepare magnesium source, the guanite of generation is detected by XRD instruments, and collection of illustrative plates is exactly matched with guanite standard diagram, illustrate mainly into
It is divided into guanite, is about 10kg after weighing, the ratio in guanite shared by phosphorus is calculated according to 13%, can obtain the removal rate of phosphorus
It is 82%.
Embodiment 2：
Guanite preparation system according to pH is 10, Mg/N 1：1st, P/N=1.15, mixing time 3min reaction condition into
During row：
By taking the excess sludge anaerobic fermented liquid of the sewage treatment plant of offshore place day 50,000 tons of sewage of processing as an example, generate daily
About 300 tons of excess sludge, wherein 10 tons of excess sludge is subjected to anaerobic fermentation, ammonia-nitrogen content is 150mg/L in zymotic fluid,
Phosphorus content is 160mg/L.As shown in Figure 1, colloid and particulate matter are removed by more medium filter 1 and cartridge filter 2 first,
Then seawater is pumped into three sections of nanofiltration systems 4 with high-pressure pump 3 and handles seawater and prepare magnesium source, MgSO4Salt rejection rate >=97%, CaCl2It is de-
Salt rate 30%~50%, NaCl salt rejection rates 30%~50%, the production water rate of recovery 75%~90%, concentrated water is returned as magnesium source, fresh water
Go back to sea.Magnesium ion content is about 12416mg/L in the concentrated water of generation, and calcium ion content is about 1200mg/L；In alkaline chemical precipitation
System 6 adds in sodium hydroxide solution, and place to go part calcium ion, obtains the magnesium ion that final content is about 10g/L to a certain extent
Solution.According to pH it is 10 in guanite preparation system 5, Mg/N 1：1st, P/N=1.15, mixing time 3min reaction conditions into
Row, need to add magnesium source about 4200g, and using about 0.48 ton of seawater, i.e., 10 tons of anaerobic fermented liquid needs about 0.48 ton of seawater
Prepare magnesium source, the guanite of generation is detected by XRD instruments, and collection of illustrative plates is exactly matched with guanite standard diagram, illustrate mainly into
It is divided into guanite, is about 10.7kg after weighing, the ratio in guanite shared by phosphorus is calculated according to 13%, can obtain the removal of phosphorus
Rate is 84%.
Embodiment 3：
Guanite preparation system according to pH is 11, Mg/N 2：1st, P/N=1.3, mixing time 5min reaction condition into
During row：
By taking the excess sludge anaerobic fermented liquid of the sewage treatment plant of offshore place day 50,000 tons of sewage of processing as an example, generate daily
About 300 tons of excess sludge, wherein 10 tons of excess sludge is subjected to anaerobic fermentation, ammonia-nitrogen content is 150mg/L in zymotic fluid,
Phosphorus content is 160mg/L.As shown in Figure 1, colloid and particulate matter are removed by more medium filter 1 and cartridge filter 2 first,
Then seawater is pumped into three sections of nanofiltration systems 4 with high-pressure pump 3 and handles seawater and prepare magnesium source, MgSO4Salt rejection rate >=97%, CaCl2It is de-
Salt rate 30%~50%, NaCl salt rejection rates 30%~50%, the production water rate of recovery 75%~90%, concentrated water is returned as magnesium source, fresh water
Go back to sea.Magnesium ion content is about 12416mg/L in the concentrated water of generation, and calcium ion content is about 1200mg/L；In alkaline chemical precipitation
System 6 adds in sodium hydroxide solution, and place to go part calcium ion, obtains the magnesium ion that final content is about 10g/L to a certain extent
Solution.According to pH it is 11 in guanite preparation system 5, Mg/N 2：1st, P/N=1.3, mixing time 5min reaction conditions into
Row, need to add magnesium source about 4100g, and using about 0.47 ton of seawater, i.e., 10 tons of anaerobic fermented liquid needs about 0.47 ton of seawater
Prepare magnesium source, the guanite of generation is detected by XRD instruments, and collection of illustrative plates is exactly matched with guanite standard diagram, illustrate mainly into
It is divided into guanite, is about 10.3kg after weighing, the ratio in guanite shared by phosphorus is calculated according to 13%, can obtain the removal of phosphorus
Rate is 83%.
Claims (10)
1. a kind of method for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite, is at least made of following process：
1) colloid and particulate matter in seawater are removed；
2) seawater is by three sections of nanofiltration systems, and the concentrated water of generation is as magnesium source；
3) the concentrated water magnesium source generated after nanofiltration is handled into alkaline chemical precipitation system, removes part Ca2+；
4) supernatant of settling system and anaerobic fermented liquid and lye are added in into guanite preparation system, generates guanite and sink
It forms sediment.
2. the method as described in claim 1, it is characterized in that the step 1) seawater passes through pretreatment system more medium filter
After cartridge filter processing, seawater is pumped into nanofiltration system by high-pressure pump.
3. the method as described in claim 1, it is characterized in that three sections of nanofiltration systems of the step 2), the concentrated water of first segment is as
Two sections of water inlet, the water inlet of the concentrated water of second segment as third section, the membrane component quantity of back segment pressure vessel is than the preceding paragraph
Membrane component quantity is few.
4. method described in claim 1, it is characterized in that the pressure vessel arrangement of three sections of nanofiltration systems of the step 2) is than being 4:
2:1。
5. the method described in claim 2 it is characterized in that the filter medium of medium filter uses quartz sand and activated carbon, uses
The mode of pressure filtration.
6. the method described in claim 2 it is characterized in that the filter core aperture of the cartridge filter is 5 μm, refers to water outlet siltation
Number SDI<5.
7. the method described in claim 3, it is characterized in that selecting NF membrane DF8040-R30/365, MgSO4Salt rejection rate >=97%,
CaCl2Salt rejection rate 30%~50%, NaCl salt rejection rates 30%~50%, the production water rate of recovery 75%~90%, concentrated water as magnesium source,
Fresh water returns to sea.
8. the method described in claim 2, it is characterized in that plus-minus settling system is to be received by adding in lye sodium hydroxide with three sections
Mg in the concentrated water that filter system generates2+、Ca2+Ion is reacted, and removes a part of calcium ion, reduces what guanite was precipitated
It influences.
9. the method described in claim 2, it is characterized in that guanite preparation system be by add in anaerobic fermented liquid and magnesium source with
And the lye sodium hydroxide of pH is adjusted, according to pH be 8~11, Mg/N is 1.0~2.0：1st, when P/N=0.7~1.3, stirring
Between 2min~5min reaction condition carry out, be prepared into guanite.
10. the method as described in claim 1, it is characterized in that being used as sewage disposal after the supernatant recycling of guanite preparation system
The additional carbon or other application of factory.
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Cited By (4)
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| CN108892117A (en) * | 2018-07-13 | 2018-11-27 | 中国科学技术大学 | A kind of guanite nano wire and preparation method thereof |
| CN109368946A (en) * | 2018-12-18 | 2019-02-22 | 江苏科技大学 | Sewage from Ships processing coupling recovery of nitrogen and phosphorus integral system and method |
| CN109368945A (en) * | 2018-12-18 | 2019-02-22 | 江苏科技大学 | Sewage from Ships processing and recovery of nitrogen and phosphorus integral system and method based on sea water magnesia source |
| CN115340240A (en) * | 2022-08-24 | 2022-11-15 | 广东邦普循环科技有限公司 | Comprehensive treatment method of wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108892117A (en) * | 2018-07-13 | 2018-11-27 | 中国科学技术大学 | A kind of guanite nano wire and preparation method thereof |
| CN109368946A (en) * | 2018-12-18 | 2019-02-22 | 江苏科技大学 | Sewage from Ships processing coupling recovery of nitrogen and phosphorus integral system and method |
| CN109368945A (en) * | 2018-12-18 | 2019-02-22 | 江苏科技大学 | Sewage from Ships processing and recovery of nitrogen and phosphorus integral system and method based on sea water magnesia source |
| CN115340240A (en) * | 2022-08-24 | 2022-11-15 | 广东邦普循环科技有限公司 | Comprehensive treatment method of wastewater |
| CN115340240B (en) * | 2022-08-24 | 2023-06-16 | 广东邦普循环科技有限公司 | Comprehensive treatment method for nickel-cobalt-manganese ternary lithium battery wastewater |
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