AU2020101661A4 - A device and method for simultaneous recovery of nitrogen and phosphorus from biogas slurry - Google Patents
A device and method for simultaneous recovery of nitrogen and phosphorus from biogas slurry Download PDFInfo
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- AU2020101661A4 AU2020101661A4 AU2020101661A AU2020101661A AU2020101661A4 AU 2020101661 A4 AU2020101661 A4 AU 2020101661A4 AU 2020101661 A AU2020101661 A AU 2020101661A AU 2020101661 A AU2020101661 A AU 2020101661A AU 2020101661 A4 AU2020101661 A4 AU 2020101661A4
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/004—Sludge detoxification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
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- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses an efficient and low-consumption device and method for simultaneous
recovery of nitrogen and phosphorus from biogas slurry, which belongs to the field of biogas
slurry treatment and resource recovery. The invention is composed of biogas slurry preheater,
C02 removal reactor, vacuum NH3 stripping reactor, ammonium bicarbonate recovery system
and struvite recovery system.
-1/1
3 4
Magnsitun salt 1410
Efn Gapurification
M 9
\/ Cooling
Struvite product 2sstemn
Biogas slunry
rccquaton re itculation
ISte CO Centriuge
_1_/ 7 Anunaoniui bicarbonate
product
Figure 1
Description
-1/1
3 4
Magnsitun salt 1410 Efn Gapurification M 9
\/ Cooling Struvite product 2sstemn
Biogas slunry rccquaton re itculation
ISte CO Centriuge
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Figure 1
PATENTS ACT 1990
A device and method for simultaneous recovery of nitrogen and phosphorus from biogas
slurry
The invention is described in the following statement:-
The invention belongs to the field of biogas slurry treatment and resource recovery, in
particular to a device and method for simultaneous recovery of nitrogen and phosphorus
from biogas slurry with high efficiency and low consumption.
During wastewater treatment, 3 0 -4 5 % N and 90% P are enriched in sewage sludge. After
anaerobic digestion, nitrogen in sludge mainly exists in the form of ammonia nitrogen in
biogas slurry. High ammonia nitrogen concentration in biogas slurry has become a
bottleneck problem limiting the whole chain path of sludge anaerobic digestion. At the
same time, with the global shortage of phosphorus resources, the recovery of phosphorus
from sludge is the key direction of sludge recycling in the future.
Traditional biological treatment methods such as nitrification-denitrification and
anammox are mainly used in the nitrogen removal of biogas slurry. Due to the high
concentrations of nitrogen and phosphorus in the biogas slurry and the low COD
concentration, much carbon sources and energy are consumed during biological
treatment, which has the disadvantages of large land occupation and high operation cost,
and it is not considered for the recovery of nitrogen and phosphorus from biogas slurry.
At present, nitrogen recovery methods in biogas slurry mainly include air stripping and
ammonia stripping with steam, and phosphorus recovery is mainly through chemical
precipitation methods. However, the traditional nitrogen and phosphorus recovery methods usually need to add alkali liquor to adjust pH, especially for biogas slurry, which would consume much alkali due to the high buffering capacity, and has the disadvantages of low recovery efficiency, high energy consumption and air pollution.
Aiming at the problem of ammonia removal from biogas slurry, patent document
201510452491.8 discloses an ammonia stripping and resource recovery treatment system
and treatment method for high concentration of ammonia nitrogen wastewater. Ammonia
nitrogen is removed by air stripping at high temperature after alkali adjustment, which
has the disadvantages of large chemical consumption, low removal efficiency and
complex process system. Patent document 201610892778.7 discloses a decarbonization
combined with ammonia removal system of biogas slurry, which realizes two-stage
ammonia removal without external alkali addition, and adopts negative pressure ammonia
evaporation to reduce steam energy consumption. However, the system uses air stripping
to remove C02 in the decarbonization process, which may cause part of ammonia loss
and increase tail gas absorption load. In addition, the system only considers the recovery
of ammonia solution, without the formation of high value-added ammonia products.
Patent document 201810449637.7 discloses a system and method for nitrogen and
phosphorus recovery from municipal sludge based on supercritical technology.
Supercritical oxidation technology is used to recover ammonia nitrogen and phosphate
from sludge. However, there are some shortcomings such as high energy consumption,
the need to add a large amount of alkali liquor, and the recovery of nitrogen fertilizer
products is not considered.
In view of the problems existing in the prior art, the invention provides a device and
method for simultaneous recovery of nitrogen and phosphorus from biogas slurry with
high efficiency and low consumption. The method utilizes the alkalinity of biogas slurry
and biogas energy generated by anaerobic digestion to realize synchronous and efficient
recovery of nitrogen and phosphorus in biogas slurry without alkali addition, reducing
system energy consumption and chemicals consumption. At the same time, it is of great
significance to promote the recycling of sludge resources.
In order to achieve the above purpose, the invention provides a device for simultaneous
recovery of nitrogen and phosphorus from biogas slurry with high efficiency and low
consumption, which is mainly composed of biogas slurry preheater (2), C02 removal
reactor (3), vacuum NH3 stripping reactor (6), carbonization tower (11) and struvite
crystallization reactor (15). Among them, the biogas slurry preheater (2) is a tubular
preheater, and the shell side is the raw biogas slurry, which is connected with the influent
pump (1) and the water inlet of the C02removal reactor (3) through a pipeline, and the
pipe side is the high temperature biogas slurry after ammonia removal, which is
connected with the water outlet of the vacuum NH3 stripping reactor (6) and the
phosphorus recovery lifting pump (14) through a pipeline; A variable-frequency stirring
brush (4) is arranged in the C02 removal reactor (3), the water outlet is connected with
the water inlet of the vacuum ammonia stripping reactor (6) through a booster pump (5);
A spray head (7) and a steam baffle (8) are arranged in the vacuum NH3 stripping reactor
(6), the bottom of the spray head (7) is connected with the water inlet pipe and the steam
pipe, the top steam outlet is connected with the cooler (9) through the pipeline, the condensate water flows back to the ammonia stripping reactor (6), and the non condensable gas containing ammonia is pumped into the carbonization tower (11) through the jet flow vacuum pump (10); the carbonization tower is provided with a condensing coil (12), aC02 air inlet is arranged at the bottom, the bottom water outlet is connected with the crystal slurry tank (13), and the top air outlet is connected with the tail gas purification; the struvite crystallization reactor (15) is provided with an agitator, the top is provided with a magnesium salt adding port, and the bottom is provided with a conical precipitation area.
The invention provides a method for simultaneous recovery of nitrogen and phosphorus
in biogas slurry with high efficiency and low consumption, and the specific steps are as
follows:
(1) The anaerobic digestion biogas slurry was preheated to 55-60°C, and the preheating
energy source was mainly from the residual heat of the biogas slurry with ammonia
removal, and the temperature of the biogas slurry was reduced to room temperature;
(2) Under the conditions of negative pressure and rotary brush stirring, the alkalinity of
the preheated biogas slurry is destroyed, bicarbonate is decomposed, andC02 is released.
The pH of biogas slurry can naturally rise to above 9, which improves the dissociation
degree of free ammonia;
(3) After theC02 is removed, the biogas slurry is pressurized and sprayed, the spray is
formed in the ammonia removal reactor, increasing the gas-liquid contact area, the biogas
slurry is heated to 85-90°C by steam, and the ammonia gas mass transfer driving force
increased under vacuum conditions to improve the ammonia removal efficiency, the
ammonia nitrogen removal can be more than 80%;
(4) After condensation and gas-liquid separation of steam containing ammonia, ammonia
gas enters into the carbonization tower and reacts with C02 to produce ammonium
bicarbonate. After crystallization and centrifugal separation, ammonium bicarbonate
product is formed. The tail gas is purified to meet the emission standards and discharged;
(5) Under the alkaline pH condition of biogas slurry after ammonia removal, magnesium
salt is added to further remove the residual ammonia nitrogen and phosphate in the biogas
slurry, and struvite product is recovered at the same time. The recovery rate of nitrogen
and phosphorus could reach more than 90%.
Preferably, the total alkalinity of the biogas slurry is about 6000-12000 mg CaCO3/L, the
ammonia nitrogen concentration is about 1500-3000 mg/L, and the phosphate
concentration is about 150-300 mg/L.
Preferably, the temperature of biogas slurry in the C02 removal reactor is about 50-55°C,
and the stirring speed is about 50-60 rpm. The pH value can be increased to 9-10 without
alkali addition by taking advantage of the alkalinity destruction of biogas slurry.
Preferably, the steam source of the ammonia stripping reactor is the steam generated by
anaerobic digestion of biogas, the temperature of biogas slurry is 80-85°C, the vacuum
pressure is 70-80 kPa, and the ammonia nitrogen removal rate of biogas slurry is more
than 80%.
Preferably, the C02 source of the carbonization tower can utilize the C02 in the biogas,
and the ammonium bicarbonate product generated can be used as fertilizer and
desulfurization and denitrification agent of the incineration power plant.
Preferably, the struvite crystallization process does not need additional alkali, and the
residual nitrogen and phosphorus recovery rate in the biogas slurry can reach more than
% by using the alkaline pH of the biogas slurry and adding a certain proportion of
magnesium salt.
Compared with the prior art, the invention has the following beneficial effects:
1. Taking full advantage of the alkalinity characteristics of biogas slurry, the bicarbonate
alkalinity decomposes and releases C02 under heating conditions. Meanwhile, by
utilizing the difference of Henry constant of C02 and NH3, the horizontal type rotary
brush stirring method is innovatively adopted to realize the rapid removal of dissolved
C02 in the biogas slurry, so as to avoid the blockage problem caused by the resolution
column, and the pH value of biogas slurry will naturally rise to more than 9 without alkali
addition, which can provide the advantage conditions for the following nitrogen and
phosphorus recovery.
2. The biogas energy generated by anaerobic digestion process is fully utilized to provide
energy for the ammonia removal of biogas slurry. The energy in the system is recycled by
preheating to reduce the subsequent condensate consumption. In addition, the negative
pressure condition is adopted to reduce the energy consumption of the system without
introduction of external air, and the tail gas absorption device is installed to reduce the
pollution to the surrounding environment.
3. Spraying method is adopted in the ammonia stripping process of biogas slurry, which
can effectively increase the gas-liquid contact area, and it could improve the driving force
of mass transfer from the liquid phase to the gas phase under the condition of negative
pressure, so as to avoid the problems of blockage and redissolution in the traditional
ammonia stripping tower, and reduce the system complexity.
4. The carbonization process makes full use of the existing C02resources in biogas. The phosphorus recovery system without alkali addition makes full use of the alkaline pH condition of the biogas slurry after ammonia removal. At the same time, it realizes the simultaneous removal of nitrogen and phosphorus from the biogas slurry, reduces the operation cost, and realizes the efficient recovery and utilization of carbon, nitrogen and phosphorus resources in the sludge.
In order to explain the embodiments of the invention or the technical solutions more
clearly, the following will give a brief introduction to the drawings needed in the
description of the embodiments. It is obvious that other drawings can be obtained
according to these drawings for ordinary technical personnel without paying creative
labor.
Fig. 1 is a schematic diagram of a device and a method for simultaneous recovery of
nitrogen and phosphorus from biogas slurry with high efficiency and low consumption.
In the figure, 1- influent pump, 2-biogas slurry preheater, 3-CO2 removal reactor, 4
stirring brush, 5-booster pump, 6-vacuum NH3 stripping reactor, 7-spray head, 8-steam
baffle, 9-cooler, 10-jet vacuum pump, 11-carbonization tower, 12-condensing coil, 13
crystal slurry tank, 14-lifting pump, 15-struvite crystallization reactor.
The present invention is described in detail with reference to the drawings and
embodiments, but does not constitute any limitation to the invention.
Example 1
The concentration of ammonia nitrogen, total alkalinity, phosphate and pH of biogas
slurry are 1500 mg/L, 6000 mg/L, 150 mg/L and 7.8, respectively. The biogas slurry was
preheated to 50°C and pumped into the C02 removal reactor. At the same time, the rotary
brush stirring and vacuum pumping system were started. The bicarbonate alkalinity was
decomposed, and the release of dissolved C02 in biogas slurry was accelerated. After
being stirred for 30 min at 50 rpm, and the biogas slurry pH increased to 9. Then the
biogas slurry is mixed with steam and sprayed in ammonia stripping reactor to increase
gas-liquid contact area. The temperature of the biogas slurry in ammonia stripping reactor
is 80°C, and the pressure is 70 kPa. The free ammonia in the biogas slurry is removed by
steam stripping under high temperature and negative pressure. The ammonia nitrogen
removal rate of biogas slurry can reach more than 80%, and the ammonia nitrogen
concentration in the residual biogas slurry is less than 300 mg/L. After cooling, steam
containing ammonia is passed into the carbonization tower to form concentrated
ammonia water, which reacts with pressurized C02 to form ammonium bicarbonate
crystal. After low speed centrifugation, ammonium bicarbonate product can be formed.
After ammonia removal, the pH of biogas slurry is about 9, magnesium chloride solution
is added, and the ratio of Mg2+: P043 - is adjusted to about 1.2:1, the rotating speed is 150
rpm, and the reaction time is 10 min, struvite crystal precipitation is formed. The
ammonia nitrogen concentration of effluent is about 150 mg/L, and the phosphate
concentration is about 10 mg/L. The recovery rate of nitrogen and phosphorus of biogas
slurry is more than 90%.
Example 2
The concentration of ammonia nitrogen, total alkalinity, phosphate and pH of biogas
slurry are 3000 mg/L, 12000 mg/L, 300 mg/L and 8, respectively. The biogas slurry was
preheated to 55°C and pumped into the C02 removal reactor. At the same time, the rotary
brush stirring and vacuum pumping system were started. The bicarbonate alkalinity was
decomposed, and the release of dissolved C02 in biogas slurry was accelerated. After
being stirred for 30 min at 50 rpm, and the biogas slurry pH increased to 9.5. Then the
biogas slurry is mixed with steam and sprayed in ammonia stripping reactor to increase
gas-liquid contact area. The temperature of the biogas slurry in ammonia stripping reactor
is 85°C, and the pressure is 80 kPa. The free ammonia in the biogas slurry is removed by
steam stripping under high temperature and negative pressure. The ammonia nitrogen
removal rate of biogas slurry can reach more than 85%, and the ammonia nitrogen
concentration in the residual biogas slurry is less than 450 mg/L. After cooling, steam
containing ammonia is passed into the carbonization tower to form concentrated
ammonia water, which reacts with pressurized C02 to form ammonium bicarbonate
crystal. After low speed centrifugation, ammonium bicarbonate product can be formed.
After ammonia removal, the pH of biogas slurry is about 9, magnesium chloride solution
is added, and the ratio of Mg2+: P043 - is adjusted to about 1.2:1, the rotating speed is 150
rpm, and the reaction time is 10 min, struvite crystal precipitation is formed. The
ammonia nitrogen concentration of effluent is about 150 mg/L, and the phosphate
concentration is about 20 mg/L. The recovery rate of nitrogen and phosphorus of biogas
slurry is more than 90%.
Finally, it should be noted that the above embodiments are only used to illustrate the
technical solutions of the invention, rather than limitations. Although the invention has been described in detail with reference to a better embodiment, those skilled in the art should understand that the technical solution of the invention can be modified or replaced by the same method without departing from the spirit and scope of the technical solution of the invention, which would be covered by the present invention in the scope of claims.
Claims (7)
1. A device for simultaneous recovery of nitrogen and phosphorus from biogas slurry
with high efficiency and low consumption is mainly composed of biogas slurry preheater
(2), C02 removal reactor (3), vacuum NH3 stripping reactor (6), carbonization tower (11)
and struvite crystallization reactor (15). Among them, the biogas slurry preheater (2) is a
tubular preheater, and the shell side is the raw biogas slurry, which is connected with the
influent pump (1) and the water inlet of the C02removal reactor (3) through a pipeline,
and the pipe side is the high temperature biogas slurry after ammonia removal, which is
connected with the water outlet of the vacuum NH3 stripping reactor (6) and the
phosphorus recovery lifting pump (14) through a pipeline; A variable-frequency stirring
brush (4) is arranged in the C02 removal reactor (3), the water outlet is connected with
the water inlet of the vacuum ammonia stripping reactor (6) through a booster pump (5);
A spray head (7) and a steam baffle (8) are arranged in the vacuum NH3 stripping reactor
(6), the bottom of the spray head (7) is connected with the water inlet pipe and the steam
pipe, the top steam outlet is connected with the cooler (9) through the pipeline, the
condensate water flows back to the ammonia stripping reactor (6), and the non
condensable gas containing ammonia is pumped into the carbonization tower (11)
through the jet flow vacuum pump (10); the carbonization tower is provided with a
condensing coil (12), a C02 air inlet is arranged at the bottom, the bottom water outlet is
connected with the crystal slurry tank (13), and the top air outlet is connected with the tail
gas purification; the struvite crystallization reactor (15) is provided with an agitator, the
top is provided with a magnesium salt adding port, and the bottom is provided with a
conical precipitation area.
2. A method for simultaneous recovery of nitrogen and phosphorus in biogas slurry with
high efficiency and low consumption is characterized by the following steps:
(1) The anaerobic digestion biogas slurry was preheated to 55-60°C, and the preheating
energy source was mainly from the residual heat of the biogas slurry with ammonia
removal, and the temperature of the biogas slurry was reduced to room temperature;
(2) Under the conditions of negative pressure and rotary brush stirring, the alkalinity of
the preheated biogas slurry is destroyed, bicarbonate is decomposed, and C02 is released.
The pH of biogas slurry can naturally rise to above 9, which improves the dissociation
degree of free ammonia;
(3) After the C02 is removed, the biogas slurry is pressurized and sprayed, the spray is
formed in the ammonia removal reactor, increasing the gas-liquid contact area, the biogas
slurry is heated to 85-90°C by steam, and the ammonia gas mass transfer driving force
increased under vacuum conditions to improve the ammonia removal efficiency, the
ammonia nitrogen removal can be more than 80%;
(4) After condensation and gas-liquid separation of steam containing ammonia, ammonia
gas enters into the carbonization tower and reacts with C02 to produce ammonium
bicarbonate. After crystallization and centrifugal separation, ammonium bicarbonate
product is formed. The tail gas is purified to meet the emission standards and discharged;
(5) Under the alkaline pH condition of biogas slurry after ammonia removal, magnesium
salt is added to further remove the residual ammonia nitrogen and phosphate in the biogas
slurry, and struvite product is recovered at the same time. The recovery rate of nitrogen
and phosphorus could reach more than 90%.
3. The method according to claim 2, which is characterized in that the total alkalinity of
the biogas slurry in step (1) is about 6000-12000 mg CaCO3/L, the ammonia nitrogen
concentration is about 1500-3000 mg/L, and the phosphate concentration is about 150
300 mg/L.
4. The method according to claim 2, which is characterized in that the temperature of
biogas slurry in the C02 removal reactor in step (2) is about 50-55°C, and the stirring
speed is about 50-60 rpm. The pH value can be increased to 9-10 without alkali addition
by taking advantage of the alkalinity destruction of biogas slurry.
5. The method according to claim 2, which is characterized in that, the steam source of
the ammonia stripping reactor in step (3) is the steam generated by anaerobic digestion of
biogas, the temperature of biogas slurry is 80-85°C, the vacuum pressure is 70-80 kPa,
and the ammonia nitrogen removal rate of biogas slurry is more than 80%.
6. The method according to claim 2, which is characterized in that the C02 source of the
carbonization tower can utilize the C02 in the biogas in step (4), and the ammonium
bicarbonate product generated can be used as fertilizer and desulfurization and
denitrification agent of the incineration power plant.
7. The method according to claim 2, which is characterized in that the struvite
crystallization process does not need additional alkali in step (5), and the residual
nitrogen and phosphorus recovery rate in the biogas slurry can reach more than 90% by using the alkaline pH of the biogas slurry and adding a certain proportion of magnesium salt.
-1/1-
Figure 1
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158986A (en) * | 2020-09-23 | 2021-01-01 | 广西大学 | Method for treating sewage containing high ammonia, nitrogen and phosphorus in livestock and poultry farm by using boric sludge |
| CN112266851A (en) * | 2020-10-28 | 2021-01-26 | 浙江天地环保科技股份有限公司 | Efficient heat recycling system and method for coupling biogas engineering and biogas slurry thermal hydrolysis engineering |
| CN112354216A (en) * | 2020-10-28 | 2021-02-12 | 苏州艾吉克膜科技有限公司 | Ammonia gas recovery device of natural pond liquid deamination |
| CN114074998A (en) * | 2021-11-16 | 2022-02-22 | 中国科学院城市环境研究所 | Pretreatment method and system for recovering pipeline scaling prevention cooperative resources |
| CN114560591A (en) * | 2022-03-04 | 2022-05-31 | 珠海市科立鑫金属材料有限公司 | Clean treatment process of cobalt-containing wastewater |
| CN114920405A (en) * | 2022-05-25 | 2022-08-19 | 江南大学 | Efficient deamination device and method for leachate AnMBR effluent of waste incineration plant |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158986A (en) * | 2020-09-23 | 2021-01-01 | 广西大学 | Method for treating sewage containing high ammonia, nitrogen and phosphorus in livestock and poultry farm by using boric sludge |
| CN112158986B (en) * | 2020-09-23 | 2023-04-07 | 广西大学 | Method for treating sewage containing high ammonia, nitrogen and phosphorus in livestock and poultry farm by using boric sludge |
| CN112266851A (en) * | 2020-10-28 | 2021-01-26 | 浙江天地环保科技股份有限公司 | Efficient heat recycling system and method for coupling biogas engineering and biogas slurry thermal hydrolysis engineering |
| CN112354216A (en) * | 2020-10-28 | 2021-02-12 | 苏州艾吉克膜科技有限公司 | Ammonia gas recovery device of natural pond liquid deamination |
| CN114074998A (en) * | 2021-11-16 | 2022-02-22 | 中国科学院城市环境研究所 | Pretreatment method and system for recovering pipeline scaling prevention cooperative resources |
| CN114074998B (en) * | 2021-11-16 | 2023-11-10 | 中国科学院城市环境研究所 | Pretreatment method and system for preventing pipeline scaling and recovering cooperative resources |
| CN114560591A (en) * | 2022-03-04 | 2022-05-31 | 珠海市科立鑫金属材料有限公司 | Clean treatment process of cobalt-containing wastewater |
| CN114920405A (en) * | 2022-05-25 | 2022-08-19 | 江南大学 | Efficient deamination device and method for leachate AnMBR effluent of waste incineration plant |
| CN114956293A (en) * | 2022-05-25 | 2022-08-30 | 江南大学 | Method for removing ammonia nitrogen in kitchen wastewater |
| CN114956293B (en) * | 2022-05-25 | 2023-10-27 | 江南大学 | Method for removing ammonia nitrogen in kitchen wastewater |
| CN114920405B (en) * | 2022-05-25 | 2023-10-31 | 江南大学 | Efficient deamination device and method for leachate AnMBR effluent of waste incineration plant |
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