CN108502965A - The method of ammonia nitrogen and absorption nitrogen rejection facility in a kind of zeolite adsorbing and removing waste water - Google Patents
The method of ammonia nitrogen and absorption nitrogen rejection facility in a kind of zeolite adsorbing and removing waste water Download PDFInfo
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- CN108502965A CN108502965A CN201810295266.1A CN201810295266A CN108502965A CN 108502965 A CN108502965 A CN 108502965A CN 201810295266 A CN201810295266 A CN 201810295266A CN 108502965 A CN108502965 A CN 108502965A
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
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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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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Abstract
Present description provides a kind of method of ammonia nitrogen in zeolite adsorbing and removing waste water and absorption nitrogen rejection facilitys.The method of ammonia nitrogen includes the following steps in the zeolite adsorbing and removing waste water：Nitrogen-containing wastewater is flowed through into the adsorbent equipment filled with zeolite and carries out absorption denitrogenation processing, the temperature of the absorption denitrogenation processing is 30 75 DEG C, residence time of the nitrogen-containing wastewater in the adsorbent equipment is 15min 30min, purified ammonia nitrogen waste water is discharged into composite wastewater treatment plant qualified discharge, the zeolitic material of adsorption saturation is regenerated using the method for " lye reverse circulation+air blast+steam stripping ", and the caustic waterflooding that regeneration lye strips processing unit as high-ammonia-nitrogen sewage recycles.
Description
Technical field
This specification belongs to refinery water treatment technology field, is related to a kind of side of ammonia nitrogen in zeolite adsorbing and removing waste water
Method and absorption nitrogen rejection facility.
Background technology
Nitrogen in oil product crude oil time processing and secondary processing process conversion move to water phase formed it is a large amount of high nitrogenous
Point source sewage (acid water), high-ammonia-nitrogen sewage is handled through stripper plant deamination is converted to general nitrogenous stripping purified water, stripping
Purification water section is back to use electric desalting apparatus as water filling and is being discharged into sewage farm, is partly directly discharged to sewage disposal
.Nitrogen discharged in the sewage of source analysis shows, stripping purified water is sewage farm total nitrogen load maximum contribution source.It is conventional dirty
Water treatment technology denitrification ability analysis shows, it is up to standard that existing petroleum refining sewage treatment process is difficult to realize total nitrogen depth, needs
The total nitrogen to be cut down processing load.
Therefore, a kind of ammonia nitrogen removal method for capableing of in line purified water is found, source sewage total nitrogen materialization removing machine is established
System is an important research topic.
Invention content
The shortcomings that in view of the above-mentioned prior art, this specification are designed to provide ammonia in a kind of zeolite adsorbing and removing waste water
The method and absorption nitrogen rejection facility of nitrogen.It is dirty can effectively to remove high nitrogenous point source for the method for ammonia nitrogen in the zeolite adsorbing and removing waste water
Ammonia nitrogen in water.
In order to reach goal of the invention above-mentioned, the method that this specification provides ammonia nitrogen in a kind of zeolite adsorbing and removing waste water,
It includes the following steps：
Nitrogen-containing wastewater is flowed through into the adsorbent equipment filled with zeolite and carries out absorption denitrogenation processing, the absorption denitrogenation processing
Temperature be 30-75 DEG C, residence time of the nitrogen-containing wastewater in the adsorbent equipment be 15min-30min.
According to the specific embodiment of this specification, it is preferable that in the adsorbent equipment, the volume loading of zeolite is 90%
More than.
According to the specific embodiment of this specification, it is preferable that the grain size of the zeolite is 0.5mm-4.5mm；It is highly preferred that
The grain size of the zeolite is 0.5mm-1.5mm.
According to the specific embodiment of this specification, it is preferable that the silica alumina ratio of the zeolite is 3.5-4.5；It is highly preferred that institute
The silica alumina ratio for stating zeolite is 4.1-4.22.
According to the specific embodiment of this specification, it is preferable that filling the porosity after zeolite inside the adsorbent equipment is
40%-55%.
According to the specific embodiment of this specification, it is preferable that the temperature of the absorption denitrogenation processing is 60 DEG C.
According to the specific embodiment of this specification, it is preferable that the flow velocity of the nitrogen-containing wastewater is 3.6m/h or more；It is preferred that
For 6m/h-10m/h.
According to the specific embodiment of this specification, it is preferable that the method further includes by the boiling after adsorbing denitrogenation processing
The step of stone is regenerated；Preferably, the step of zeolite regeneration includes：Zeolite after adsorbing denitrogenation processing is placed in 60
It impregnates, rinse in the sodium hydroxide lye that DEG C -80 DEG C of mass concentration is 2%-7%, be then discharged out lye, heated using steam
The zeolite 2h or more that dipping by lye is crossed obtains regenerated zeolite.The zeolite 2h or more that dipping by lye is crossed generally is boiled using steam.
This specification, which also provides, adsorbs nitrogen rejection facility used by the method for ammonia nitrogen in above-mentioned zeolite adsorbing and removing waste water,
Including：
Adsorption column, both sides are provided with the first supporting layer and the second supporting layer up and down for the inside of the adsorption column, and described first
Zeolite is filled between supporting layer and the second supporting layer；It is set between the bottom of the adsorption column and the second supporting layer of close bottom
It is equipped with a water distributor；
The bottom sides of the adsorption column are provided with liquid inlet, and the liquid inlet is connected to the water distributor, described
The bottom of adsorption column is provided with air inlet, steam inlet and liquid outlet；Steam (vapor) outlet, institute are provided at the top of the adsorption column
It states the top of adsorption column and is provided with water purification outlet between first supporting layer at top.
According to the specific embodiment of this specification, it is preferable that the liquid inlet respectively with raw material water tank, alkali liquid tank and soft
Change water pot connection.
According to the specific embodiment of this specification, it is preferable that the raw material water tank is connected to macropore ceramics security filter,
The macropore ceramics security filter is connected with purified water.
According to the specific embodiment of this specification, it is preferable that the liquid outlet is connected to salkali waste flow container；Preferably, institute
Salkali waste flow container is stated to be connected to stripper water filling device.
According to the specific embodiment of this specification, it is preferable that the water purification outlet is connected to treated water tank；Preferably, institute
Water purification outlet is stated to be connected to the salkali waste flow container.
According to the specific embodiment of this specification, it is preferable that the steam (vapor) outlet is connected to dense ammoniacal liquor tank, and the steam goes out
It is provided with condenser pipe between mouth and the dense ammoniacal liquor tank.
Compared with prior art, the method for ammonia nitrogen can use in a kind of zeolite adsorbing and removing waste water that this specification provides
Zeolite largely adsorbs the ammonia nitrogen compound in high nitrogenous effluent, and zeolite can regenerate, and the zeolite after regeneration can reuse,
Carry out the absorption and removing of ammonia nitrogen compound.Method is simple, at low cost, and raw material can regenerate, environment friendly and pollution-free.In addition, this
The method of ammonia nitrogen can recycle the note alkali alkali of existing refinery stripper plant in the zeolite adsorbing and removing waste water that specification provides
Liquid greatly reduces the consumption of drug medication, especially under 60 DEG C or so of adsorption conditions, shows fabulous absorption effect
Fruit, adsorption efficiency are high.And zeolite regeneration process uses " lye reverse circulation+air blast+steam stripping " method, zeolite regeneration efficiency
Also very high, especially suitable for the source emission reduction processing of Petrochemical Enterprises point source high ammonia nitrogen stripping purified water nitrogen pollutant.
Description of the drawings
Fig. 1 is the zeolite pictorial diagram that embodiment 1 provides；
Fig. 2 is the zeolite surface scanning figure that embodiment 1 provides；
Fig. 3 is the apparatus structure schematic diagram of the Dynamic Adsorption pilot plant test of embodiment 1；
Fig. 4 is the apparatus structure schematic diagram of the Dynamic Adsorption pilot experiment of embodiment 2；
Fig. 5 is that 3 different-grain diameter zeolite adsorbent solution ammonia nitrogen concentration of embodiment changes over time curve graph；
Fig. 6 is under 3 condition of different temperatures of embodiment, and ammonium chloride of the zeolite in ammonia nitrogen concentration 62.5mg/L to 5000mg/L is molten
Adsorbance change curve in liquid；
Fig. 7 is HRT 15min zeolite dynamic adsorption curve maps in embodiment 3；
Fig. 8 is HRT 30min zeolite dynamic adsorption curve maps in embodiment 3；
Fig. 9 be in embodiment 3 HRT to the impact analysis figure of the rate of adsorption of zeolite；
Figure 10 is the adsorption breakthrough curve figure of the zeolite under different regeneration conditions in embodiment 3；
Figure 11 is surface SEM (scanning electron microscope) picture of 5 zeolite of working condition after adsorption saturation in embodiment 3
Figure 12 is the surface SEM pictures after 5 zeolite regeneration of working condition in embodiment 3；
Figure 13 is the denitrification effect analysis chart that pilot-plant runs 15 periods in embodiment 3.
Specific implementation mode
In order to which the technical characteristic of this specification, purpose and advantageous effect are more clearly understood, now to this specification
Technical solution carry out it is described further below, but should not be understood as to this specification can practical range restriction.
Embodiment 1
Present embodiments provide a kind of lab scale method and device of ammonia nitrogen in dynamic zeolite adsorbing and removing waste water.
Experiment material：Selection Beipiao, liaoning natural clinoptilolite is experiment material, density 1.97g/cm3, bulk density
0.96g/cm3, porosity 40%-55%, silica alumina ratio 4.10-4.22.Using sieve filter out grain size be respectively 0.5-1.5mm,
The zeolite of 1.5-2.5mm, 2.5-3.5mm, 3.5-4.5mm, drying for standby after ultra-pure water cleaning.The element of the natural zeolite forms
It is shown in Table 1, scanning (BEM) photo on pictorial diagram and surface is shown in Fig. 1 and Fig. 2 respectively.
Table 1
| Element | C | O | Na | Mg | Al | Si | K | Ca | Fe |
| Content (%) | 14.92 | 0.27 | 0.31 | 0.76 | 4.24 | 15.86 | 0.45 | 2.93 | 0.33 |
The device of this Dynamic Adsorption pilot plant test is as shown in Figure 3.It is primarily used to determine the zeolite under dynamic condition
Adsorbance and residence time parameter.Adsorb column internal diameter D=32mm, height 1.2m, dischargeable capacity packed height 0.9m, bed
Dischargeable capacity 723mL, filling sized zeolite particles are (0.5-1.5mm) 723mL, about 700g, and immersion measures gap and is about for volume
300mL, porosity 41.49%.Device water inlet uses wriggling pump water inlet, the temperature of adsorption column to be carried out using controllable temperature heat tape
Heating, waste water have the non-filling side of U-tube to enter, enter after being preheating to 60 DEG C, adsorption column deamination.Device water outlet can monitor wink
When effluent quality, device effluent collection measure cumulative mean concentration.
Activated Zeolite Adsorption used by the Dynamic Adsorption pilot plant test of the present embodiment will not introduce other dirts into purified water
Object is contaminated, purified water water quality that treated can still meet its reuse water quality requirement.Therefore, Activated Zeolite Adsorption can to stripping
The purified water of device discharge is handled entirely, and processing water is 78.5t/h.Ammonia nitrogen concentration 166.43mg/L in purified water, quality stream
It is 13.06kg/h to measure, and after emission reduction 6.08kg/h, surplus 6.98kg/h, remaining ammonia nitrogen concentration is 88.92mg/L, and ammonia nitrogen is gone
Except rate 46.57%.Thus may determine that the effluent quality requirement of zeolite absorption after-purification water is<88.92mg/L.
Embodiment 2
Present embodiments provide a kind of pilot scale method and device of ammonia nitrogen in dynamic zeolite adsorbing and removing waste water.
Experiment material：Select the zeolite of embodiment 1 as experiment material.The device of this Dynamic Adsorption pilot experiment is as schemed
Shown in 4.
Zeolite regeneration condition is the key that zeolite absorption denitrogenation method, and the condition for the zeolite regeneration that laboratory research determines is very
The operating mode of hardly possible simulation industrialized unit, so the pilot-plant of the present embodiment structure is primarily used to determine the regeneration condition of zeolite
With the adsorbance after regeneration, science data support is provided for the industrial applications of the technology.As shown in figure 4, absorption column internal diameter D=
350mm, total high 3300mm, effective height 2.75m (ratio of height to diameter 7.85), volume 300L, dischargeable capacity 250L.Zeolite filler is filled
250L fills 240kg zeolites, voidage 100L (porosity 40%).Pilot-plant water inlet uses the diaphragm pump of acid and alkali-resistance
Water inlet, absorption column bottom setting evacuated tube, air hose and low-pressure steam pipeline, outside setting pipeloop.
Embodiment 3
The present embodiment has studied the principal element for influencing zeolite adsorption/desorption ammonia nitrogen, and specific experiment is as follows：
1. Staticadsorption experiment
Content 1：Have studied influence of the sized zeolite particles to adsorption effect：
10g zeolites different-grain diameter (0.5-1.5mm, 1.5-2.5mm, 2.5-3.5mm, 3.5-4.5mm) zeolite is weighed to be put into
In 500ml conical flasks, the NH that 200mL ammonia nitrogen concentrations are 200.00mg/L is added4Cl solution, the constant temperature oscillation at 60 DEG C, every
Ammonia nitrogen concentration is measured by sampling in 0.5h.And equilibrium adsorption capacity (the q of zeolite is calculated according to formula (1)e, mg/g)：
qe=V (C0-Ce)/m (1)
Wherein：C0For ammonia nitrogen initial concentration (mg/L), CeFor remaining ammonia nitrogen concentration (mg/L), m in zeolite adsorption equilibrium solution
For the dosage (g) of zeolite, V is liquor capacity (L).
Content 2：Influence of the adsorption temp to zeolite adsorption effect is determined by measuring adsorption isothermal curve：
10g grain size 0.5~1.5mm zeolites are weighed to be put into 500ml conical flasks, be added 200mL ammonia nitrogen concentrations be 62.5,
125, the NH of 250,500,750,1000,1500,2000,2500,3000,4000,5000mg/L4Cl solution, respectively 30,
45, for 24 hours, ammonia nitrogen concentration is measured by sampling in constant temperature oscillation at 60,75 DEG C.Adsorption isotherm is fitted using Langmuir Adsorption Models.
Langmuir isothermal adsorpting equation formulas are shown in formula (2)：
Ce/qe=1/ (qm×KL)+Ce/qm (2)
Wherein：qe、CeEtc. the same formula of parameters meaning (1), qmFor maximal absorptive capacity (mg/g), KLFor Langmuir isothermals
Absorption constant dimension is L/mg, and value, which increases, indicates that adsorption capacity increases.Ce/qeWith adsorbance QeBetween relationship image be
Langmuir adsorption isotherms.
2. purified water Dynamic Adsorption is tested：By investigating influence of the residence time to zeolite adsorption effect, determining influences boiling
The key parameter of stone absorption, the data reference of science is provided for the design and operation of device.
Experimental provision adsorbs small testing device using the zeolite of embodiment 1, and strip purified water using refinery intakes as device.It fills out
Fill the dischargeable capacity 300mL of device after zeolite, control flow of inlet water 600mL/h, 1200mL/h, then the residence time of sewage be
30min and 15min.A flow of inlet water is changed, needs to recharge primary by dry new zeolite.Control adsorption reaction temperature
60 DEG C of degree.Every the ammonia nitrogen concentration that 1 hour measures water outlet, until outlet, ammonia nitrogen concentration reaches the 95% of import, is considered as and penetrates.It examines
Examine influence of the residence time to zeolite adsorption effect.
3. zeolite regeneration pilot experiment：The main absorption property determined after zeolite regeneration condition and repeatedly regeneration.
Experimental provision adsorbs pilot-plant using the zeolite of embodiment 2, and strip purified water using refinery intakes as device.It fills out
The active porosity volume 100L of device after zeolite is filled, flow of inlet water 200L/h is controlled, then the residence time is 30min, sewage up-flow
Speed 5.5m/h.Control adsorption reaction temperature 60 C.5% sodium hydroxide (technical grade) lye (60 is used after zeolite adsorption saturation
DEG C, every time into the waste-heat for using purified water before device, the raising of temperature improves the kinetic energy of ion motion, makes regeneration lye
Obtain diffusion enhancing of the ammonia nitrogen ion in zeolite cavity) it is regenerated.Each lye dosage 120L, using air feed aeration
Solute delivery rate between mode (15L/min) intensifying regenerating agent and zeolite, and the trip reduced in regenerated liquid is acted on by stripping
From ammonia amount, so that the ammonium ion improved in solution is converted to the rate of free ammonia, and then the ammonia nitrogen on zeolite is improved to regeneration
Migration rate in liquid.Circulating pump is 200L/h with flow in zeolite regeneration, from the bottom to top circular regeneration liquid, is further strengthened
Mass transfer.Alkali liquid regeneration process is repeated 3 times, and regenerated liquid total amount is 360L.Then lead to low-pressure steam (0.35-0.45Mpa, temperature 150
DEG C) zeolite is thermally dried, quantity of steam 8m3/h, the temperature of zeolite layer at 95 DEG C or so, complete by regenerative process at this time.
Note alkali after spent lye collection as stripper plant supplements.The dense ammonia condensing liquid of regenerative process tower top discharge is discharged into stripper original
Expect water pot.
Experimental result and analysis：
1. Staticadsorption experiment results and analysis：
(1) influence of the grain size to zeolite absorption property
Under the conditions of 60 DEG C of adsorption temp, different-grain diameter zeolite adsorbent solution ammonia nitrogen concentration changes over time curve such as Fig. 5
It is shown.The equilibrium concentration of the zeolite of grain size condition 0.5-1.5mm, 1.5-2.5mm, 2.5-3.5mm, 3.5-4.5mm is respectively
38.45,43.62,64.5,79.01mg/L, the adsorbance of zeolite is 2.56,2.46,2.04,1.75mg/g.Grain size is smaller, boiling
The adsorption capacity of stone is stronger.It is mainly that zeolite is mainly with adsorption and ion exchange to the removal of ammonia nitrogen to analyze reason
Main, grain size more small specific surface is bigger, more for the chance of ion-exchange reactions, and the adsorption capacity of zeolite is stronger, therefore final
It chooses 0.5-1.5mm grain size zeolites and carries out further experiment.
(2) influence of the temperature to zeolite absorption property
Fig. 6 shows under condition of different temperatures, ammonium chloride solution of the zeolite in ammonia nitrogen concentration 62.5mg/L to 5000mg/L
In adsorbance change curve.It will be appreciated from fig. 6 that with equilibrium concentration CeIncrease, the adsorbance q of zeoliteeIt steeply rises, still
After balance is more than 1000mg/L or initial concentration is more than 2000mg/L, qeAscendant trend obviously slows down.When equilibrium concentration is super
After crossing 2000mg/L, curve almost becomes straight line, shows that zeolite adsorbance has been saturated.In addition with the raising of temperature,
Zeolite adsorbance also increases.30-75 DEG C of maximal absorptive capacity qmRespectively 20.79,24.10,25.90,26.87mg/g.Temperature
The q between 30-60 DEG CmIncrease that trend comparison is apparent, but 60-75 DEG C of increase trend obviously slows down, and 75 DEG C to operator
High temperature is already belonged to for member, is easy to happen scald.Therefore the safety of adsorption effect and personnel select 60 the considerations of comprehensive zeolite
DEG C be zeolite optimal adsorption temperature.
It will be appreciated from fig. 6 that the characterization of adsorption of zeolite meets Langmuir Adsorption laws, i.e. Ce/qeWith adsorbance CeBetween be in
Linear relationship fits the isothermal adsorpting equation formula of above four temperature according to Langmuir adsorption isotherms (formula 2), knot
Fruit is shown in Table 2.Four temperature conditions are compared, determining zeolite maximal absorptive capacity is tested and Langmuir Fitting equations calculates
Maximal absorptive capacity, match value is more bigger than experiment value, but variation tendency is consistent, and when temperature is higher than 60 DEG C, the maximum of zeolite is inhaled
Attached amount promotes very little, further determines that the temperature of best zeolite treatment purified water is 60 DEG C.
Table 2
| T/℃ | Adsorption isotherm | Related coefficient | KL(L/mg) | qm(mg/g) |
| 30 | Ce/qe=0.04495Ce+10.8911 | 0.9983 | 0.0041 | 22.24 |
| 45 | Ce/qe=0.03907Ce+9.6414 | 0.9968 | 0.0040 | 25.60 |
| 60 | Ce/qe=0.03676Ce+6.1935 | 0.9980 | 0.0059 | 27.20 |
| 75 | Ce/qe=0.03584Ce+4.3272 | 0.9986 | 0.0083 | 27.90 |
By Fig. 6 and the analysis of table 2 it is found that adsorption mechanism of the ammonia nitrogen on zeolite is based on ion exchange and chemisorption, ammonia
The increase of nitrogen concentration, liquid phase (solution) and the concentration difference of solid phase (zeolite) are bigger, and the diffusion kinetics of ammonia nitrogen to zeolite surface are bigger,
Adsorption reaction rate is influenced, already close to zero, entirely to react the maximum adsorption of infinite approach zeolite by the diffusion rate of ammonia nitrogen
Rate, therefore the adsorbance of zeolite increases.When the temperature increases, ion heat movement speed also increases, and ammonia nitrogen penetrates zeolite table
The power of face limitans resistance also increases, and has promoted ammonia nitrogen to the diffusion inside zeolite micropore, the adsorbance of zeolite is caused to increase.
2. result and the analysis of the experiment of purified water Dynamic Adsorption：
(1) residence time 15min zeolites absorption property
Residence time 15min zeolite Absorbency Test condition：Temperature 60 C, inflow 1200mL/h, the ammonia of purified water
Nitrogen concentration 163.85mg/L, zeolite loading 700g.Fig. 7 is HRT (hydraulic detention time) 15min zeolite Dynamic Adsorption curves
Figure, as shown in Figure 7, small testing device are discharged the ammonia nitrogen instantaneous concentration 12.55mg/L and cumulative mean concentration 9.11mg/L of 1h, with
The increase of time, two concentration values all sharply increase.When water outlet instantaneous concentration reaches nearly 60mg/L, it is discharged instantaneous concentration
Increase trend just starts to slow down.When device is run in 57h, the mean concentration of water outlet has reached 86.18mg/L, this
When water outlet instantaneous concentration be 130.7mg/L.After 1 hour, the aqueous concentration of device was climbed to 91.95mg/L, should
The highest that value alreadys exceed purified water emission reduction allows ammonia nitrogen concentration 88.92mg/L, it is thus determined that penetrating benchmark concentration and being
130.7mg/L, run time 57h.After 57h, zeolite also has certain adsorption capacity, but the mean concentration being discharged is
The requirement of nitrogen emission reduction is not achieved, is finally completely penetrated in 97h beds.Therefore based on the angle for stablizing emission reduction, when determining stop
Between under the conditions of 15min, the run time of small testing device is 57h.Processing water is 68.40L at this time, is calculated and is boiled using equilibrium concentration
It is 5125.21mg (zeolite adsorbs ammonia nitrogen amount=68.40L × (163.85mg/L-88.92mg/L)), zeolite that stone, which adsorbs ammonia nitrogen amount,
Equilibrium adsorption capacity 7.32mg/g.
It is calculated according to 60 DEG C of Langmuir Fitting equations, if equilibrium concentration is 130.70mg/L, the suction of zeolite
Attached amount qeEqual to 11.88mg/g.Although the equilibrium concentration that equilibrium concentration adsorbance and Cha Tu that Langmuir curves calculate determine
Adsorbance has certain gap, but 11.88mg/g is much larger than 7.32mg/g, this illustrates that zeolite does not reach equilibrium adsorption at all,
Device has just been discharged in purified water.
(2) residence time 30min zeolites absorption property
Residence time 30min zeolite Absorbency Test condition：Temperature 60 C, inflow 600mL/h, the ammonia nitrogen of purified water
Concentration 174.40mg/L, zeolite loading 700g.Fig. 8 is HRT (hydraulic detention time) 30min zeolite dynamic adsorption curve maps,
It is worth noting that, in fig. 8, small testing device ammonia nitrogen instantaneous concentration and cumulative mean concentration curve occur one small up to 20
When lag phase, device is discharged ammonia nitrogen instantaneous concentration and cumulative mean concentration only from the 8.56mg/L of 1h and 7.41mg/L, respectively
Increase to the 19.79mg/L and 11.98mg/L of 20h.Cumulative mean concentration merely adds 4.57mg/L, this explanation preceding 20h with
Interior zeolite adsorption bed is not pierced.To before 83h after 20h, instantaneous concentration and cumulative mean concentration just start to increase, and two
The increase trend approximation straight line of a curve, increased rate difference 2.26mg/ (Lh) and 1.08mg/ (Lh).90h it
Afterwards, device water outlet instantaneous concentration curve is close to level, aqueous concentration 167.0mg/L already close to influent concentration 174.40mg/L,
Illustrate that zeolite bed is close to be pierced completely, but cumulative mean concentration at this time is only 80.01mg/L, has not exceeded emission reduction
Highest allows ammonia nitrogen concentration 88.92mg/L.It is thus determined that it is device influent concentration 167.0mg/L to penetrate benchmark concentration, when operation
Between be 90h.
When device is run in 95h, the mean concentration of water outlet has reached 87.20mg/L, water outlet at this time
Instantaneous concentration is 167.0mg/L.After 1 hour, the aqueous concentration of device was climbed to 91.95mg/L, which alreadys exceed
The highest of purified water emission reduction allows ammonia nitrogen concentration 88.92mg/L.It is 57.0L that 95h devices, which handle water, is calculated using equilibrium concentration
It is 4970.40mg (zeolite adsorbs ammonia nitrogen amount=57.0L × (174.40mg/L-87.20mg/L)), zeolite that zeolite, which adsorbs ammonia nitrogen amount,
Equilibrium adsorption capacity 7.10mg/g.
It is calculated according to 60 DEG C of Langmuir Fitting equations, if equilibrium concentration is 167.0mg/L, the absorption of zeolite
Measure qeEqual to 13.54mg/g.Although the equilibrium concentration adsorbance that Langmuir curves calculate there are certain error,
13.54mg/g is much larger than 7.10mg/g, this illustrates that zeolite does not reach equilibrium adsorption, and device has just been discharged in purified water.When stop
Between 30min be insufficient for being less than small testing device zeolite and reach time of equilibrium adsorption.
(3) influences of the comparative analysis HRT (hydraulic detention time) to zeolite absorption property
(I) HRT analyzes the influence index of zeolite absorption property：
Table 3 is impact analysis tables of the HRT to zeolite absorption property.As shown in Table 3, under the conditions of HRT15min, zeolite is put down
Weighing apparatus adsorbance and processing water are all higher than HRT30min, this illustrates that zeolite adsorption capacity under the conditions of HRT15min is better than
HRT30min.In addition it is much smaller that benchmark concentration ratio HRT30min is penetrated under the conditions of HRT15min, further proves that zeolite exists
Adsorption capacity is better than HRT30min under the conditions of HRT15min.
Table 3
| HRT | Flow (mL/h) | Equilibrium adsorption capacity (mg/g) | Handle water (L/kg) | Penetrate benchmark concentration |
| 15 | 1200 | 7.32 | 97.71 | 130.70 |
| 30 | 600 | 7.10 | 81.43 | 167.0 |
(II) HRT analyzes the influencing mechanism of zeolite absorption property：
By Fig. 7 and Fig. 8 comparative analyses, in the same device, same sewage, mutually synthermal, equal zeolite amount of filling item
Under the experimental condition carried out under part, the flow of inlet water of HRT15min is one times of HRT30min, therefore, even if Fig. 8 extends dress
The adsorption capacity of the residence time set zeolite instead has dropped.The angle analysis for the mechanism adsorbed from zeolite influences zeolite absorption
The principal element of ammonia nitrogen has at 2 points：First, the influence of ammonia nitrogen diffusion rate；Second, the influence of zeolite adsorption capacity.It is dense in ammonia nitrogen
Spend it is higher under the conditions of (initial concentration is more than 2000mg/L, sees Fig. 6), ammonia nitrogen is diffused into the concentration difference motive force of zeolite surface very
By force, the rate of the diffusion of ammonia nitrogen no longer influences the rate of zeolite absorption ammonia nitrogen；(initial concentration under the conditions of ammonia nitrogen concentration is lower
0-500mg/L is shown in Fig. 6), the concentration difference motive force that ammonia nitrogen is diffused into zeolite surface is insufficient, and the rate of the diffusion of ammonia nitrogen will limit
The rate of zeolite absorption ammonia nitrogen processed.The ammonia-nitrogen content of purified water belongs to the first situation, is controlled by ammonia nitrogen in 160mg/L or so
Diffusion rate.And the increase of flow of inlet water, reduce the residence time, increase the turbulent extent of sewage, increases unit and cut
The processing load of area ammonia nitrogen, to improve the diffusion rate of ammonia nitrogen.This is because, first reduce half sewage stop when
Between, ammonia nitrogen can reduce half in the diffusion time of zeolite surface, can reduce the diffusion rate of zeolite.The residence time is reduced to ammonia nitrogen
Diffusion rate contribution rate is negative value, but diffusion rate is increased on the whole, this explanation is under this working condition, the residence time
To be 30min or 15min influence the diffusion rate of ammonia nitrogen and little.Second, flow velocity, which doubles, means zeolite surface
The increase of turbulivity, and corresponding interfacial film can be thinning, and then increase the power that ammonia nitrogen penetrates zeolite surface limitans resistance.Stream
The turbulent extent of body is doubled with water velocity direct proportionality, water velocity, and turbulivity will double.But
What it is due to zeolite filler layer is interstitial channels that zeolite accumulation gap is formed entirely, and mobility status of the water phase in duct be very multiple
Miscellaneous, turbulivity is difficult quantum chemical method.Third, flow velocity double, it is meant that the ammonia nitrogen loading of the zeolitic contact in each section increases
It doubles.The increase of ammonia nitrogen loading, the corresponding amount that can increase each zeolite surface contact nitrogen pollutant, improves ammonia nitrogen to zeolite
The diffusion rate on surface, and then improve the adsorption capacity of zeolite.
(III) data are taped the latent power analysis
Diffusion of the ammonia nitrogen to zeolite surface can all be promoted by increasing fluid turbulent degree and improving ammonia nitrogen loading, can all improve boiling
The adsorption efficiency of stone.But be on earth turbulent flow or load play the role of it is conclusive, it is difficult to be gone from the angle of mechanism qualitative
Quantitative analysis, and the determination of the two parameters this have very much science to the industrialization design of the following zeolite adsorption technology and application
Directive significance.Therefore, we further tap the latent power to data analysis, judge to influence zeolite adsorption efficiency by treatment effect
Leading factor.
Fig. 9 shows influences of the HRT to the rate of adsorption of zeolite.As shown in Figure 9, within 90h, residence time 15min
The rate of zeolite absorption ammonia nitrogen be almost more than residence time 30min, especially in preceding 10h, residence time 15min's
Ammonia nitrogen absorption Mean Speed (147.78mg/h) is 154.84% times of 30min (95.44mg/h).Twice of turbulent extent and processing
Load significantly improves the absorption property of zeolite, but cannot illustrate which contribution rate higher of the two parameters.Due to same
In the time range of sample, the turbulent extent and processing load of HRT15min are all 2 times of HRT30min, it is difficult to which the two is distinguished
To discuss.Therefore, selection is analyzed within the scope of no time interval under identical processing loading condiction.HRT15min
In the processing water of 1-109h all it is 64.8L in the processing water and HRT30min of 1-55h, NH_3-N treating load is respectively
The close equivalences of 11301.12mg and 10617.48mg.In the two time intervals respectively by two adsorpting rate curves and abscissa
Axis integrates, and the total amount of the zeolite absorption ammonia nitrogen obtained is 4790.10mg and 4389.11mg, and removal rate is respectively 42.38% He
41.34%.Under the conditions of same treatment water, NH_3-N treating load, quantity of sorbent, adsorption temp, experimental provision, HRT15min
HRT30min is better than to the removal amount and removal rate of ammonia nitrogen, this is shown to be turbulent extent caused by flow velocity doubles and doubles to improve
The adsorption efficiency of zeolite.Improve the adsorption capacity that flow velocity of the sewage in zeolite bed is conducive to improve zeolite.Flow velocity improves one
Times, the reaction time of half has been saved, better denitrification effect is also achieved, nitric efficiency has been equivalent to and improves 100%.
By the analysis of experimental results of the purified water Dynamic Adsorption small-scale experiment device of above-mentioned (1)-(3), it is determined that zeolite is dynamic
The key parameter of state absorption：The influence of residence time, up-flow speed to zeolite absorption property, can test for enlarged experiment and provide
Crucial design parameter.Wherein, pilot plant test result of study show the residence time not and be the key that influence zeolite absorption property because
Element, HRT15min can still obtain preferable denitrification effect, but commercial plant residence time needs are longer, to extend
The saturation time of zeolite adsorption bed reduces the regenerated frequency, simplifies operation, it is thus determined that the residence time is 30min.Secondly,
Pilot plant test result of study shows that flow velocity is the key factor for influencing purified water zeolite denitrification process, and upflow velocity is by 1.8m/
H increases to 3.6m/h, can still ensure that the equilibrium adsorption capacity of zeolite is constant, while the adsorption efficiency of zeolite improves 100%,
But influence of the increase of flow to equilibrium adsorption capacity and little.Therefore, zeolite adsorbent equipment will ensure higher in design
Ratio of height to diameter, under the conditions of identical zeolite dosage and sewage load, to ensure higher upflow velocity, determine upper up-flow
Speed at least should be greater than 3.6m/h.In addition, residence time 15min and 30min determines that the equilibrium adsorption capacity of zeolite is respectively 7.32mg/
G and 7.10mg/g.Flow velocity doubles, and equilibrium adsorption capacity increases 0.22mg/g, illustrates that flow velocity increase inhales balance
The influence of attached amount is little.In order to reserve more operating flexibility spaces, determine that the adsorbance of zeolite is 7mg/g.
3. result and the analysis of zeolite regeneration pilot experiment：
(1) zeolite regeneration condition is investigated
Zeolite regeneration process includes dipping by lye regenerative process and steam heating regenerative process.Zeolite regeneration experimental condition is shown in
Table 4 has investigated the shadow of each regenerated liquid soaking time, steam heating time and regenerated liquid cycle to zeolite absorption property respectively
It rings.
Table 4
| Condition | Each soaking time (h) | Heating time (h) | Regenerated liquid recycles |
| 1 | 1 | ||
| 2 | 1 | It is | |
| 3 | 1 | 0.5 | It is |
| 4 | 1 | 1 | It is |
| 5 | 1 | 2 | It is |
Figure 10 is the adsorption breakthrough curve of the zeolite under different regeneration conditions, as shown in Figure 10, compares operating mode 2,3,4,5,
As each soaking time 1h of regenerated liquid, regenerated liquid forced circulation, steam heating time is respectively 0,0.5,1,2 hour, corresponding
Bed penetrate water be respectively 14,17,18,20t.Steam heats the processing water for improving zeolite.In addition, equally handling
Under the conditions of water, with the extension of steam heating time, the concentration of water outlet is substantially reduced, and illustrates that treatment effeciency similarly improves.
Reason is analyzed, zeolite is after alkali liquid regeneration, and all there is also a large amount of free state ammonia nitrogens inside the surface and aperture of zeolite, and
There is also a large amount of ammonia nitrogen in a large amount of lye on zeolite surface, with steam heating zeolite, these remaining ammonia nitrogens will be by
Liquid phase evaporate into gas phase, and then improves the regeneration effect of zeolite.It compares working condition 1 and 2 to find, increases the outer circulation of lye
Be conducive to the regeneration of zeolite.To sum up determine that the regeneration condition of zeolite is operating mode 5.
Figure 11 is surface SEM (scanning electron microscope) picture of 5 zeolite of working condition after adsorption saturation, and Figure 12 is working condition
Surface SEM pictures after 5 zeolite regenerations.Figure 11 is compared with natural zeolite (Fig. 2) surface texture, the zeolite surface of unadsorbed ammonia nitrogen
Show slightly scrappy, it is seen that many ducts.There is relatively full smooth layer structure in zeolite surface after absorption ammonia nitrogen, and duct is
It is not generally visible, lamellar structure is completely covered duct, shows zeolite adsorption saturation.As shown in figure 12, by again
Zeolite pore space structure is more obvious after life, and layer structure disappears, and illustrates that zeolite regeneration is complete.
(2) 5 zeolite regeneration effect analysis of operating mode
Under the conditions of operating mode 5, adsorption column is pierced completely after handling 20t waters, and water outlet is equal with influent concentration.To operating mode
It is 1514mg, the ammonia nitrogen of 20t water that 5 curves and X-axis treating capacity, which carry out the total amount that integral show that accumulation gives off the ammonia nitrogen of adsorption column,
Processing total amount is about 3332mg, and it is 1818mg that adsorption column, which adsorbs ammonia nitrogen amount,.The equilibrium adsorption capacity of zeolite is 7.57mg/ when then penetrating
G, accumulation equilibrium concentration are 75.70mg/L.The target of purified water ammonia nitrogen emission reduction is the ammonia nitrogen concentration of water outlet<88.92mg/L so
When adsorption bed is pierced, the cumulative mean concentration of water outlet can still meet emission reduction requirement.Penetrating occurs in pilot plant test
Benchmark concentration it is equal with influent concentration the phenomenon that, the research knot of this result and HRT30min zeolite Dynamic Adsorption pilot plant tests
Fruit is close, i.e., under the conditions of HRT 30min, when adsorption column is pierced, the accumulative mean concentration of water outlet can still reach emission reduction
Target.5 curve of operating mode in the stage that penetrates without there is gentle slope phase consistent with HRT30min, penetrate the stage variation tendency and
HRT15min is almost the same, although this shows that bed is pierced, since flow velocity is too fast, part zeolite reaches flat not yet
Weigh adsorbance.This is because ammonia nitrogen efficiency is adsorbed compared with long periods of time in order and zeolite to ensure, when pilot-plant designing to stop
Between 30min and upflow velocity 5.5m/h be main technologic parameters benchmark.From the point of view of the operational effect of pilot-plant, device it is effective
Run time (100h), equilibrium adsorption capacity (7.57mg/g) penetrate benchmark concentration (maintaining an equal level with water inlet) and have reached initial and set
Count target.
(3) investigation of zeolite regeneration adsorbance
Continuous operation (was adsorbed -1 day and regenerated) to pilot-plant operation for 4 days 75 days with 5 days for a cycle, to investigate each week
The denitrification effect of phase pilot-plant.Experiment flow of inlet water is 200L/h, is to wear to be discharged ammonia nitrogen concentration to reach 95% influent concentration
Saturating benchmark.Regeneration is each dipping by lye 1 hour, impregnates 3 times, lye outer circulation, steam heats 2h.With the absorption of zeolite
Capacity is performance assessment criteria, the result is shown in Figure 13.
As shown in Figure 13, in the cyclic regeneration and adsorption process of zeolite, slow downward trend, 15 fortune are presented in adsorption capacity
The adsorption capacity average value of row period zeolite is 6.81mg/g, end value 6.60mg/g.Zeolite still keeps good absorption
Effect, system are stablized.
In summary the analysis of the principal element of zeolite adsorption/desorption ammonia nitrogen is it is found that Activated Zeolite Adsorption removes the ammonia in waste water
Nitrogen is industrially feasible, and specific evaluation is as follows：
(1) scheme is industrialized
The pilot scale research result verification feasibility of process route (Fig. 4), therefore industrialization amplification is carried out with pilot-plant.
Zeolite adsorption system primary attachment system and regenerative system are constituted, and critical process design parameter is as follows:
1. run parameter
Residence time 30min, sewage flow up speed ＞ 6m/h, purify 60 DEG C, 0.5~1.5mm of sized zeolite particles of water temperature, zeolite
Adsorbance 6.5mg/g.
2. regeneration technology parameter
Regeneration is each dipping by lye 1 hour, impregnates 3 times, aeration reinforcing mass transfer, lye outer circulation, steam heating
2h.Sodium hydroxide lye proportioning 5%, temperature 60 C.Low-pressure steam heats.Spent lye is supplemented as the note alkali of stripper plant.Again
Raw dense ammonia condensing liquid is discharged into stripper raw material water tank.
(2) cost analysis
Zeolite absorption denitrogenation cost is mainly made of investment in fixed assets cost and operating cost.Investment in fixed assets at
This is mainly the construction cost of device, and zeolite adsorbent equipment belongs to normal temperature and pressure device, and cost of investment is not high.The operation of device
Cost is main precious including electric cost, alkali regenerative agent cost, steam cost, zeolite cost.Each medicament expense when being industrialization of table 5
Accounting.
Table 5
| Title | Price (member/t) | Dosage (kg/t) | Expense (member) |
| Electric cost | 0.10 (valuation) | ||
| Low-pressure steam | 100 | 1.6 | 0.16 |
| NaOH (technical grade) | 4000 | 0.9 | 3.6 |
| Zeolite (valuation regenerates 20 times) | 700 | 0.8 | 0.56 |
| It is total | 4.42 | ||
| Year processing cost | 291 (ten thousand yuan) |
(3) feasibility analysis
For economic angle, sewage load 78.5t/h, chemicals treatment cost is 4.42 yuan/t, if equivalent
To full factory's sewage 357.06t/h, it is equivalent to the processing cost that composite wastewater Treatment stations sewage per ton increases by 0.97 yuan.From technology
For angle, entire technique carries out under normal pressure, normal temperature condition substantially, and main reactor is that adsorption tanks belong to popular response
Device is easy to build, manage and run.For the angle of environmental benefit, emission reduction ammonia nitrogen 6.08kg/h can ensure conventional A/
O biochemical denitrifications technique can realize that the depth of total nitrogen 15mg/L is up to standard.In conclusion adsorbing denitrogenation method to stone using zeolite
The sewage purification water of the oil refining high ammonia nitrogen of enterprise's point source is feasible.
(4) with the comparative analysis of existing materialization removal methods
Steam stripping method, MAP cycles pyrolysismethod, zeolite regeneration absorption method are compared, from the angle analysis of denitrogenation mechanism, steam
Vaporizing extract process is suitable for high concentration ammonia nitrogen sewage (ammonia nitrogen>It 1000mg/L) handles, submarine discharge is all had in 100% petroleum refining enterprise
Device；MAP recycles the processing that pyrolysismethod is suitable for middle low-concentration ammonia-nitrogen sewage (100~500mg/L), excessive concentration chemical agent
Consumption is too big, and the too low precipitation of concentration is not easy to generate and detach；The ammonia-nitrogen sewage that Activated Zeolite Adsorption is suitable for low concentration is handled
(0-200mg/L), since zeolite adsorbance is limited, the regeneration frequency of excessive concentration zeolite is too fast, and regenerative agent consumption is big.
From the angle analysis of technical maturity, steam stripping method forms ripe design, manufacture, operations specification；MAP is precipitated
Method is simple for process, and the ammonia that sinks is with obvious effects, but reagent cost is higher, therefore just exploitation MAP cycles pyrolysismethod is disappeared with reducing medicament
Consumption, but MAP cycle pyrolysismethods are still in the laboratory research stage, there are no form a ripe industrial applications specification；
Zeolite regeneration absorption method is simple for process, belongs to ripe technique, has been widely used in sewage treatment field.
From the angle analysis of cost, the energy consumption of sewage stripping device is 13.90kg standard coals per ton, improves its nitric efficiency
To energy consumption increasing degree very little, it is important to extend or create stripper plant；Pyrolysismethod, reagent cost per ton are recycled for MAP
It is 3.79 yuan (not regenerating 10 yuan) year processing cost 1,500,000 yuan (not regenerating 4,000,000 yuan)；It is per ton for zeolite regeneration absorption method
Reagent cost is 4.42 yuan, year processing cost 291 (ten thousand yuan).
Therefore, the method for ammonia nitrogen is by recycling existing refinery vapour in the zeolite adsorbing and removing waste water that this specification provides
The note alkali lye for carrying device, greatly reduces the consumption of drug medication, especially under 60 DEG C or so of adsorption conditions, performance
Go out fabulous adsorption effect, adsorption efficiency is high.And zeolite regeneration process is using " lye reverse circulation+air blast+steam stripping " side
Method, zeolite regeneration efficiency is also very high, and the zeolite after regeneration can reuse, and carries out the absorption and removing of ammonia nitrogen compound, special
It Shi Yongyu not the source emission reduction processing of Petrochemical Enterprises point source high ammonia nitrogen stripping purified water nitrogen pollutant.It is net Petrochemical Enterprises gas has been filled up
Change the blank of the adsorption technology of water condition, method is simple, at low cost, and sorbing material can regenerate, environment friendly and pollution-free.
Claims (10)
1. a kind of method of ammonia nitrogen in zeolite adsorbing and removing waste water comprising following steps：
Nitrogen-containing wastewater is flowed through into the adsorbent equipment filled with zeolite and carries out absorption denitrogenation processing, the temperature of the absorption denitrogenation processing
Degree is 30-75 DEG C, and residence time of the nitrogen-containing wastewater in the adsorbent equipment is 15min-30min.
2. the method for ammonia nitrogen in zeolite adsorbing and removing waste water according to claim 1, it is characterised in that：
In the adsorbent equipment, the volume loading of zeolite is 90% or more；
Preferably, the grain size of the zeolite is 0.5mm-4.5mm；
It is highly preferred that the grain size of the zeolite is 0.5mm-1.5mm；
Preferably, the silica alumina ratio of the zeolite is 3.5-4.5.
3. the method for ammonia nitrogen in zeolite adsorbing and removing waste water according to claim 1, it is characterised in that：The adsorbent equipment
Porosity after inside filling zeolite is 40%-55%.
4. the method for ammonia nitrogen in zeolite adsorbing and removing waste water according to claim 1, it is characterised in that：The absorption denitrogenation
The temperature of processing is 60 DEG C；
Preferably, the flow velocity of the nitrogen-containing wastewater is 3.6m/h or more；Preferably 6m/h-10m/h.
5. the method for ammonia nitrogen in zeolite adsorbing and removing waste water according to claim 1, it is characterised in that：The method is also wrapped
Include the step of being regenerated the zeolite after adsorbing denitrogenation processing；
Preferably, the step of zeolite regeneration includes：Zeolite after adsorbing denitrogenation processing is placed in 60 DEG C -80 DEG C of quality
It impregnates, rinse in the sodium hydroxide lye of a concentration of 2%-7%, be then discharged out lye, crossed using steam heating dipping by lye
Zeolite 2h or more obtains regenerated zeolite.
6. absorption denitrogenation dress used by the method for ammonia nitrogen in claim 1-5 any one of them zeolite adsorbing and removing waste water
It sets comprising：
The inside of adsorption column, the adsorption column is provided with the first supporting layer and the second supporting layer, first support in both sides up and down
Zeolite is filled between layer and the second supporting layer；It is provided between the bottom of the adsorption column and the second supporting layer of close bottom
One water distributor；
The bottom sides of the adsorption column are provided with liquid inlet, and the liquid inlet is connected to the water distributor, the absorption
The bottom of column is provided with air inlet, steam inlet and liquid outlet；Steam (vapor) outlet, the suction are provided at the top of the adsorption column
It is provided with water purification outlet between the top of attached column and first supporting layer at close top.
7. absorption nitrogen rejection facility according to claim 6, it is characterised in that：The liquid inlet respectively with raw material water tank,
Alkali liquid tank is connected to water softener tank；
Preferably, the raw material water tank is connected to macropore ceramics security filter, the macropore ceramics security filter and purification
Water is connected.
8. absorption nitrogen rejection facility according to claim 6, it is characterised in that：The liquid outlet is connected to salkali waste flow container；
Preferably, the salkali waste flow container is connected to stripper water filling device.
9. the absorption nitrogen rejection facility according to claim 6 or 8, it is characterised in that：The water purification outlet connects with treated water tank
It is logical；
Preferably, the water purification outlet is connected to the salkali waste flow container.
10. absorption nitrogen rejection facility according to claim 6, it is characterised in that：The steam (vapor) outlet is connected to dense ammoniacal liquor tank,
It is provided with condenser pipe between the steam (vapor) outlet and the dense ammoniacal liquor tank.
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| CN110981077A (en) * | 2019-10-28 | 2020-04-10 | 上海电力大学 | System and method for efficiently removing ammonia nitrogen based on side stream shortcut nitrification-anaerobic ammonia oxidation process |
| CN112607915A (en) * | 2020-12-29 | 2021-04-06 | 北京中科博联科技集团有限公司 | Treatment method and treatment system for high ammonia nitrogen deodorization wastewater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110563071A (en) * | 2019-08-23 | 2019-12-13 | 生态环境部华南环境科学研究所 | environment-friendly sewage treatment plant based on attapulgite filler can regenerate |
| CN110563071B (en) * | 2019-08-23 | 2022-04-05 | 生态环境部华南环境科学研究所 | Environment-friendly sewage treatment plant based on attapulgite filler can regenerate |
| CN110981077A (en) * | 2019-10-28 | 2020-04-10 | 上海电力大学 | System and method for efficiently removing ammonia nitrogen based on side stream shortcut nitrification-anaerobic ammonia oxidation process |
| CN112607915A (en) * | 2020-12-29 | 2021-04-06 | 北京中科博联科技集团有限公司 | Treatment method and treatment system for high ammonia nitrogen deodorization wastewater |
| CN115504630A (en) * | 2022-10-13 | 2022-12-23 | 单县永征宠物食品有限公司 | Comprehensive treatment device and process for wastewater generated after fermented food processing |
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