AU2021103232A4 - Method for Catalyzing and Treating Spray Booth Wastewater with Renewable Catalysts - Google Patents
Method for Catalyzing and Treating Spray Booth Wastewater with Renewable Catalysts Download PDFInfo
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- AU2021103232A4 AU2021103232A4 AU2021103232A AU2021103232A AU2021103232A4 AU 2021103232 A4 AU2021103232 A4 AU 2021103232A4 AU 2021103232 A AU2021103232 A AU 2021103232A AU 2021103232 A AU2021103232 A AU 2021103232A AU 2021103232 A4 AU2021103232 A4 AU 2021103232A4
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- spray booth
- wastewater treatment
- booth wastewater
- metal ion
- ion recovery
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- 239000002351 wastewater Substances 0.000 title claims abstract description 64
- 239000003054 catalyst Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000007921 spray Substances 0.000 claims abstract description 94
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 62
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 53
- 238000011084 recovery Methods 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000007787 solid Substances 0.000 claims abstract description 25
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 24
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 24
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 24
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 230000008929 regeneration Effects 0.000 claims abstract description 21
- 238000011069 regeneration method Methods 0.000 claims abstract description 21
- 238000001556 precipitation Methods 0.000 claims abstract description 13
- 230000003068 static effect Effects 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical group OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 26
- 235000011149 sulphuric acid Nutrition 0.000 claims description 26
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims description 16
- 230000020477 pH reduction Effects 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- JJLJMEJHUUYSSY-UHFFFAOYSA-L copper(II) hydroxide Inorganic materials [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 claims description 12
- AEJIMXVJZFYIHN-UHFFFAOYSA-N copper;dihydrate Chemical compound O.O.[Cu] AEJIMXVJZFYIHN-UHFFFAOYSA-N 0.000 claims description 12
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 12
- 239000000347 magnesium hydroxide Substances 0.000 claims description 12
- 235000012254 magnesium hydroxide Nutrition 0.000 claims description 12
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 12
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 229910052925 anhydrite Inorganic materials 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 10
- 230000003647 oxidation Effects 0.000 abstract description 10
- 238000007254 oxidation reaction Methods 0.000 abstract description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract description 7
- 238000006731 degradation reaction Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000003973 paint Substances 0.000 description 6
- 239000003595 mist Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000036632 reaction speed Effects 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 150000001555 benzenes Chemical class 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 210000004994 reproductive system Anatomy 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2103/14—Paint wastes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a spray booth wastewater treatment process. It is characterized as
follows. The spray booth wastewater is pumped into a spray booth wastewater treatment device
by a water pump after filtered by a filter screen. Then catalysts and H202 are added into the
spray booth wastewater treatment device, and fully stirred and reacted for 0.5-1 hour. All the
reacted liquid is discharged into a metal ion recovery device containing hydrated lime water,
and then is discharged after static precipitation for 2-3 hours in the metal ion recovery device.
The treatment of the spray booth wastewater is finished after the above processes. At the same
time, the solid deposits in the metal ion recovery device after discharging the liquid are
regenerated. The invention adopts a homogeneous catalytic wet hydrogen peroxide oxidation
method to treat the spray booth wastewater. It has the characteristics of high reaction rate,
thorough degradation and the like. Meanwhile, it considers the problems of subsequent
treatment and regeneration of metal ions. The process flow is simple, the energy consumption
and the equipment investment are low, and the technical and economic advantages are obvious.
Description
Method for Catalyzing and Treating Spray Booth Wastewater with Renewable
Catalysts
The invention relates to a field of wastewater treatment, particularly to a spray booth
wastewater treatment process.
Painting work has the functions of anticorrosion and decoration. But paint mist will be
produced in the process of painting. Benzene compounds such as benzene, toluene and
xylene in the paint mist will cause harm to human blood, nerve and reproductive system.
Direct discharge of the benzene compounds will cause serious air pollution. At present,
the wet water curtain adsorption device is widely adopted in the treatment of paint mist.
Most of the paint mist is dissolved in water, thus forming high-concentration painting
wastewater. The wastewater reaches saturation after being recycled for a period of time,
and must be replaced with fresh water. At present, most paint spray houses generally
discharge this kind of wastewater directly. On the surface, paint mist is transferred from
gaseous state to water body, which reduces the harm of direct discharge. But its toxicity
is transferred to water body, so effective treatment is still needed before it can be
discharged. However, the water body is generally characterized by small quantity,
dispersion, high toxicity and difficult biodegradation. Conventional biological treatment
methods are generally aimed at wastewater with large quantity, stable source property
and easy biodegradation. It will be difficult to use biological methods for such
wastewater. And physical methods such as slag removal and flocculation have
shortcomings such as incomplete treatment. Therefore, the present invention aims to use homogeneous catalytic wet hydrogen peroxide oxidation method to carry out efficient catalytic oxidation degradation on the wastewater. The wastewater is mineralized into water and carbon dioxide, and harmless discharge can be realized. The discharge problem of wastewater produced by wet water curtain adsorption in spray booth is accordingly resolved.
The purpose of the present invention is to solve the treatment problem of small amount
and scattered spray booth wastewater which is directly discharged without treatment. The
present invention proposes to adopt a homogeneous catalytic wet hydrogen peroxide
oxidation method to catalyse, oxidize and degrade the wastewater. The method
mineralizes the wastewater into water and carbon dioxide, thereby realizing harmless
discharge.
In order to achieve the above purpose, the present invention provides the following
technical scheme.
A spray booth wastewater treatment process comprises the following steps. Filtering the
spray booth wastewater by a filter screen and pumping it into a spray booth wastewater
treatment device. Then adding catalysts and H202 into the spray booth wastewater
treatment device, fully stirring and reacting for 0.5-1 hour. Discharging all the reacted
liquid into a metal ion recovery device containing hydrated lime water, and then
discharging the liquid after static precipitation for 2-3 hours in the metal ion recovery
device. The treatment of the spray booth wastewater is finished after the above processes.
At the same time, regenerating the solid deposits in the metal ion recovery device after
discharging the liquid.
Furthermore, the catalysts added in the spray booth wastewater treatment device are
CuSO4-5H20 and MgSO4-7H20.
Furthermore, content of H202 added in the spray booth wastewater treatment device is
0.015%-0.045% (mass percentage).
Furthermore, the CuSO4-5H20 and MgSO4-7H20 catalysts added in the spray booth
wastewater treatment device have a CuSO4-5H20 content of 0.01%-0.1% (mass
percentage) and a MgSO4-7H20 content of 0.001%-0.01% (mass percentage).
Furthermore, the solid deposits after the liquid is discharged from the metal ion recovery
device by static precipitation are Cu(OH)2, Mg(OH)2 and CaSO4.
Furthermore, regenerating the solid deposits in the metal ion recovery device after
discharging the liquid by H2SO4 acidification. The regeneration treatment mode is H2SO4
acidification regeneration.
Furthermore, the pH value of the spray booth wastewater ranges from 3 to 10.6.
Furthermore, the spray booth wastewater treatment device is provided with an activated
carbon fixed bed adsorption layer at the upper part of the liquid surface. The height of the
bed layer is 1/2-3/4 of the vertical distance between the bottom of the device and the
wastewater liquid surface.
Furthermore, the spray booth wastewater treatment device is provided with a mechanical
stirrer, and the stirring speed is 55r/min to 115r/min.
Furthermore, an electric heater is arranged at the bottom of the spray booth wastewater
treatment device to ensure that the reaction temperature range of wastewater in the spray
booth wastewater treatment device is 55°C-80°C.
Furthermore, in the metal ion recovery device containing hydrated lime water, the content
of hydrated lime in the hydrated lime water is 0.02%-0.25% (mass percentage).
Furthermore, the solid deposits in the metal ion recovery device after discharging the
liquid are subjected to H2SO4 acidification regeneration treatment. Wherein the mass of
H2SO4 used for H2SO4 acidification regeneration is 1-1.7 times the mass of Cu(OH)2 and
Mg(OH)2.
The beneficial effects of the invention include the following aspects.
1) Because homogeneous catalytic wet hydrogen peroxide oxidation is adopted, the
catalysts and organic matters in wastewater can be oxidized by rapid contact. Therefore
reducing mass transfer resistance, greatly improving reaction speed. And catalytic
oxidation degradation of organic matters in a short time, usually within half an hour can
be realized.
2) The catalysts adopted in the invention have a wide pH value adaptation range. It has a
great advantage compared with the traditional Fenton method, which generally needs to
operate in the pH value range of 2-4. At the same time, because the wastewater in the
spray booth is generally in the neutral range, there is no need to adjust the pH value of the
wastewater additionally.
3) The invention also provides an activated carbon fixed bed as an adsorption treatment
layer, so as to adsorb organic waste gas volatilized from the wastewater. Therefore zero
pollution discharge of the spray booth wastewater can be realized.
4) Cu(OH)2 and Mg(OH)2 in the metal ion recovery device can be reused as catalysts
after being acidified and regenerated by H2SO4. Therefore the secondary pollution of
metal ions can be reduced and the cost can be saved.
Figure 1 A schematic diagram of a spray booth wastewater treatment process according
to the present invention
The invention will be further described with reference to the drawings and examples.
As shown in the figure, the spray booth wastewater treatment process of this embodiment
includes the following steps.
1) The wastewater of spray booth is filtered by a filter screen and pumped into the
wastewater treatment device of spray booth by a water pump. Then catalysts and H202
are added into the wastewater treatment device of spray booth, fully stirred and reacted
for 0.5-1 hour. All the reacted liquid is discharged into a metal ion recovery device
containing hydrated lime water, and then is discharged after static precipitation in the
metal ion recovery device for 2-3 hours. The treatment of the spray booth wastewater is
finished after the above processes. At the same time, the solid deposits in the metal ion
recovery device after discharging the liquid are regenerated.
2) In the above step 1), the catalysts added in the spray booth wastewater treatment
device are CuSO4-5H20 and MgSO4-7H20.
3) In the above step 1), the content of H202 added in the spray booth wastewater
treatment device is 0.015%-0.045% (mass percentage).
4) In the above step 1), the CuSO4-5H20 and MgSO4-7H20 catalysts added in the spray
booth wastewater treatment device have a CuSO4-5H20 content of 0.01%-0.1% (mass
percentage) and a MgSO4-7H20 content of 0.001%-0.01% (mass percentage).
) In the above step 1), the solid deposits after the liquid is discharged from the metal ion
recovery device by static precipitation are Cu(OH)2,Mg(OH)2and CaSO4.
6) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are regenerated. The regeneration treatment mode is H2SO4
acidificationregeneration.
7) In the above step 1), the pH value of the spray booth wastewater ranges from 3 to 10.6.
8) In the above step 1), the spray booth wastewater treatment device is provided with an
activated carbon fixed bed adsorption layer at the upper part of the liquid surface. The
height of the bed layer is 1/2-3/4 of the vertical distance between the bottom of the device
and the wastewater liquid surface.
9) In the above step 1), the spray booth wastewater treatment device is provided with a
mechanical stirrer with a stirring speed of 55 r/min to 115 r/min.
) In the above step 1), an electric heater is arranged at the bottom of the spray booth
wastewater treatment device to ensure that the wastewater reaction temperature range in
the spray booth wastewater treatment device is 55C-80°C.
11) In the above step 1), in the metal ion recovery device containing hydrated lime water,
the content of hydrated lime in hydrated lime water is 0.02%-0.25% (mass percentage).
12) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are subjected to H2SO4 acidification regeneration treatment. Wherein
the mass of H2SO4 used for H2SO4 acidification regeneration is 1-1.7 times the mass of
Cu(OH)2and Mg(OH)2.
According to the invention, the advantage that the catalysts react with organic matters in
wastewater under homogeneous conditions is fully utilized. Therefore the mass transfer resistance is reduced, the reaction speed is greatly improved, and the catalytic oxidation degradation of organic matters can be realized in a short time. Meanwhile, the catalysts adopted in the invention have synergistic effect and wide pH value adaptability.
Therefore the pH value of wastewater does not need to be adjusted additionally.
According to the invention, the metal ion recovery device is arranged. Thus the catalysts
can be regenerated and reused, the problem of secondary pollution of metal ions is
reduced. The cost is saved, the process flow is simple, the energy consumption and
equipment investment are low, and the overall technical and economic advantages are
obvious.
The first embodiment
1) The wastewater of spray booth is filtered by a filter screen and pumped into the
wastewater treatment device of spray booth by a water pump. Then catalysts and H202
are added into the wastewater treatment device of spray booth, fully stirred and reacted
for 0.5 hour. All the reacted liquid is discharged into a metal ion recovery device
containing hydrated lime water, and then is discharged after static precipitation in the
metal ion recovery device for 2 hours. The treatment of the spray booth wastewater is
finished after the above processes. At the same time, the solid deposits in the metal ion
recovery device after discharging the liquid are regenerated.
2) In the above step 1), the catalysts added in the spray booth wastewater treatment
device areCuSO4-5H20 and MgSO4-7H20.
3) In the above step 1), the content of H202 added in the spray booth wastewater
treatment device is 0.015% (mass percentage).
4) In the above step 1), the CuSO4-5H20 and MgSO4-7H20 catalysts added in the spray
booth wastewater treatment device have a CuSO4-5H20 content of 0.01% (mass
percentage) and a MgSO4-7H20 content of 0.001% (mass percentage).
) In the above step 1), the solid deposits after the liquid is discharged from the metal ion
recovery device by static precipitation are Cu(OH)2, Mg(OH)2 and CaSO4.
6) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are regenerated. The regeneration treatment mode is H2SO4
acidificationregeneration.
7) In the above step 1), the pH value of the spray booth wastewater is 3.
8) In the above step 1), the spray booth wastewater treatment device is provided with an
activated carbon fixed bed adsorption layer at the upper part of the liquid surface. The
height of the bed layer is 1/2 of the vertical distance between the bottom of the device and
the wastewater liquid surface.
9) In the above step 1), the spray booth wastewater treatment device is provided with a
mechanical stirrer with a stirring speed of 55 r/min.
) In the above step 1), an electric heater is arranged at the bottom of the spray booth
wastewater treatment device to ensure that the wastewater reaction temperature in the
spray booth wastewater treatment device is 55C.
11) In the above step 1), in the metal ion recovery device containing hydrated lime water,
the content of hydrated lime in hydrated lime water is 0.02% (mass percentage).
12) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are subjected to H2SO4 acidification regeneration treatment. Wherein the mass of H2SO4 used for H2SO4 acidification regeneration is 1 time the mass of
Cu(OH)2 and Mg(OH)2.
According to the invention, the advantage that the catalysts react with organic matters in
wastewater under homogeneous conditions is fully utilized. Therefore the mass transfer
resistance is reduced, the reaction speed is greatly improved, and the catalytic oxidation
degradation of organic matters can be realized in a short time. Meanwhile, the catalysts
adopted in the invention have synergistic effect and wide pH value adaptability.
Therefore the pH value of wastewater does not need to be adjusted additionally.
According to the invention, the metal ion recovery device is arranged. Thus the catalysts
can be regenerated and reused, the problem of secondary pollution of metal ions is
reduced. The process flow is simple, the energy consumption and equipment investment
are low, and the overall technical and economic advantages are obvious.
The second embodiment
1) The wastewater of spray booth is filtered by a filter screen and pumped into the
wastewater treatment device of spray booth by a water pump. Then catalysts and H202
are added into the wastewater treatment device of spray booth, fully stirred and reacted
for 0.75 hour. All the reacted liquid is discharged into a metal ion recovery device
containing hydrated lime water, and then is discharged after static precipitation in the
metal ion recovery device for 2.5 hours. The treatment of the spray booth wastewater is
finished after the above processes. At the same time, the solid deposits in the metal ion
recovery device after discharging the liquid are regenerated.
2) In the above step 1), the catalysts added in the spray booth wastewater treatment
device are CuSO4-5H20 and MgSO4-7H20.
3) In the above step 1), the content of H202 added in the spray booth wastewater
treatment device is 0.03% (mass percentage).
4) In the above step 1), the CuSO4-5H20 and MgSO4-7H20 catalysts added in the spray
booth wastewater treatment device have a CuSO4-5H20 content of 0.05% (mass
percentage) and a MgSO4-7H20 content of 0.005% (mass percentage).
) In the above step 1), the solid deposits after the liquid is discharged from the metal ion
recovery device by static precipitation are Cu(OH)2, Mg(OH)2 and CaSO4.
6) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are regenerated. The regeneration treatment mode is H2SO4
acidificationregeneration.
7) In the above step 1), the pH value of the spray booth wastewater is 6.8.
8) In the above step 1), the spray booth wastewater treatment device is provided with an
activated carbon fixed bed adsorption layer at the upper part of the liquid surface. The
height of the bed layer is 5/8 of the vertical distance between the bottom of the device and
the wastewater liquid surface.
9) In the above step 1), the spray booth wastewater treatment device is provided with a
mechanical stirrer with a stirring speed of 85 r/min.
) In the above step 1), an electric heater is arranged at the bottom of the spray booth
wastewater treatment device to ensure that the wastewater reaction temperature in the
spray booth wastewater treatment device is 70°C.
11) In the above step 1), in the metal ion recovery device containing hydrated lime water,
the content of hydrated lime in hydrated lime water is 0.115% (mass percentage).
12) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are subjected to H2SO4 acidification regeneration treatment. Wherein
the mass of H2SO4 used for H2SO4 acidification regeneration is 1.35 times the mass of
Cu(OH)2 and Mg(OH)2.
The invention reacts under homogeneous conditions. Therefore the mass transfer
resistance is reduced, the reaction speed is improved, and the catalytic oxidation
degradation of organic matters can be realized in a short time. Meanwhile, the catalysts
adopted in the invention have synergistic effect and wide pH value adaptability.
Therefore the pH value of wastewater does not need to be adjusted additionally.
According to the invention, the catalysts can be regenerated and reused, the problem of
secondary pollution of metal ions is reduced, the cost is saved. The process flow is
simple, the energy consumption and equipment investment are low, and the overall
technical and economic advantages are obvious.
The third embodiment
1) The wastewater of spray booth is filtered by a filter screen and pumped into the
wastewater treatment device of spray booth by a water pump. Then catalysts and H202
are added into the wastewater treatment device of spray booth, fully stirred and reacted
for 1 hour. All the reacted liquid is discharged into a metal ion recovery device
containing hydrated lime water, and then is discharged after static precipitation in the
metal ion recovery device for 3 hours. The treatment of the spray booth wastewater is
finished after the above processes. At the same time, the solid deposits in the metal ion
recovery device after discharging the liquid are regenerated.
2) In the above step 1), the catalysts added in the spray booth wastewater treatment
device are CuSO4-5H20 and MgSO4-7H20.
3) In the above step 1), the content of H202 added in the spray booth wastewater
treatment device is 0.045% (mass percentage).
4) In the above step 1), the CuSO4-5H20 and MgSO4-7H20 catalysts added in the spray
booth wastewater treatment device have a CuSO4-5H20 content of 0.1% (mass
percentage) and a MgSO4-7H20 content of 0.01% (mass percentage).
) In the above step 1), the solid deposits after the liquid is discharged from the metal ion
recovery device by static precipitation are Cu(OH)2, Mg(OH)2 and CaSO4.
6) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are regenerated. The regeneration treatment mode is H2SO4
acidificationregeneration.
7) In the above step 1), the pH value of the spray booth wastewater is 10.6.
8) In the above step 1), the spray booth wastewater treatment device is provided with an
activated carbon fixed bed adsorption layer at the upper part of the liquid surface. The
height of the bed layer is 3/4 of the vertical distance between the bottom of the device and
the wastewater liquid surface.
9) In the above step 1), the spray booth wastewater treatment device is provided with a
mechanical stirrer with a stirring speed of 115 r/min.
) In the above step 1), an electric heater is arranged at the bottom of the spray booth
wastewater treatment device to ensure that the wastewater reaction temperature in the
spray booth wastewater treatment device is 80°C.
11) In the above step 1), in the metal ion recovery device containing hydrated lime water,
the content of hydrated lime in hydrated lime water is 0.25% (mass percentage).
12) In the above step 1), the solid deposits in the metal ion recovery device after
discharging liquid are subjected to H2SO4 acidification regeneration treatment. Wherein
the mass of H2SO4 used for H2SO4 acidification regeneration is 1.7 times the mass of
Cu(OH)2 and Mg(OH)2.
The invention reacts under homogeneous conditions. It has the characteristics of small
mass transfer resistance and high catalytic oxidation degradation speed of organic
matters. Meanwhile, the catalysts adopted in the invention have synergistic effect and
wide pH value adaptability. Therefore the pH value of wastewater does not need to be
adjusted additionally. According to the invention, the catalysts can be regenerated and
reused, the problem of secondary pollution of metal ions is reduced, the cost is saved.
The process flow is simple, the energy consumption and equipment investment are low,
and the overall technical and economic advantages are obvious.
Finally, the above embodiments are only used to illustrate the technical scheme of the
present invention, but not to limit it. Although the present invention has been described in
detail with reference to the preferred embodiments, those of ordinary skill in the art
should understand that the technical scheme of the present invention can be modified or
equivalently replaced without departing from the purpose and scope of the technical
scheme of the present invention, which should be covered by the claims of the present
invention.
Claims (7)
1. A spray booth wastewater treatment process is characterized in that: the spray booth
wastewater is filtered by a filter screen and pumped into a spray booth wastewater
treatment device by a water pump, then catalysts and H202 are added into the spray booth
wastewater treatment device, fully stirred and reacted for 0.5-1 hour, and all the reacted
liquid is discharged into a metal ion recovery device containing hydrated lime water, and
then is discharged after static precipitation for 2-3 hours; the treatment of the spray booth
wastewater is finished after the above processes; at the same time, the solid deposits in
the metal ion recovery device after discharging the liquid are regenerated;
catalysts added in the spray booth wastewater treatment device are CuSO4-5H20 and
MgSO4-7H20;
0 .0 the content of H202 added in the spray booth wastewater treatment device is 15%
0.045% (mass percentage);
the CuSO4-5H20 and MgSO4-7H20 catalysts are added in the spray booth wastewater
treatment device, wherein the content ofCuSO4-5H20 is 0.01%-0.1% (mass percentage),
and the content of MgSO4-7H20 is 0.001%-0.01% (mass percentage);
the metal ion recovery device has solid deposits of Cu(OH)2, Mg(OH)2 and CaSO4 after
discharging liquid by static precipitation.
the solid deposits in the metal ion recovery device after discharging the liquid are
regenerated, and the regeneration treatment mode is H2SO4 acidification regeneration.
2. The spray booth wastewater treatment process according to Claim 1 is characterized in
that the pH value of the spray booth wastewater ranges from 3 to 10.6.
3. The spray booth wastewater treatment process according to Claim 1 is characterized in
that the spray booth wastewater treatment device is provided with an activated carbon
fixed bed adsorption layer at the upper part of the liquid surface, and the height of the bed
layer is 1/2-3/4 of the vertical distance between the bottom of the device and the
wastewater liquid surface.
4. The spray booth wastewater treatment process according to Claim 1 is characterized
in that the spray booth wastewater treatment device is provided with a mechanical stirrer
with a stirring speed of 55 r/min to 115 r/min.
5. The spray booth wastewater treatment process according to Claim 1 is characterized in
that an electric heater is arranged at the bottom of the spray booth wastewater treatment
device to ensure that the wastewater reaction temperature range in the spray booth
wastewater treatment device is 55°C-80°C.
6. The spray booth wastewater treatment process according to Claim 1 is characterized in
that the metal ion recovery device containing hydrated lime water has a hydrated lime
content of 0.02%-0.25% (mass percentage).
7. The spray booth wastewater treatment process according to Claim 1 is characterized in
that the solid deposits in the metal ion recovery device after discharging liquid are
subjected to H2SO4 acidification regeneration treatment, wherein the mass of H2SO4 used
for H2SO4 acidification regeneration is 1-1.7 times the mass of Cu(OH)2 and Mg(OH)2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021103232A AU2021103232A4 (en) | 2021-06-09 | 2021-06-09 | Method for Catalyzing and Treating Spray Booth Wastewater with Renewable Catalysts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021103232A AU2021103232A4 (en) | 2021-06-09 | 2021-06-09 | Method for Catalyzing and Treating Spray Booth Wastewater with Renewable Catalysts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021103232A4 true AU2021103232A4 (en) | 2021-08-05 |
Family
ID=77076047
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021103232A Ceased AU2021103232A4 (en) | 2021-06-09 | 2021-06-09 | Method for Catalyzing and Treating Spray Booth Wastewater with Renewable Catalysts |
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| Country | Link |
|---|---|
| AU (1) | AU2021103232A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890600A (en) * | 2022-05-11 | 2022-08-12 | 南京宇越水性涂料技术有限公司 | A circulation processing system that is arranged in waste gas waste liquid of vehicle after market |
-
2021
- 2021-06-09 AU AU2021103232A patent/AU2021103232A4/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890600A (en) * | 2022-05-11 | 2022-08-12 | 南京宇越水性涂料技术有限公司 | A circulation processing system that is arranged in waste gas waste liquid of vehicle after market |
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