CN111392968A - Multi-stage ecological treatment method for town sewage - Google Patents
Multi-stage ecological treatment method for town sewage Download PDFInfo
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- CN111392968A CN111392968A CN202010220738.4A CN202010220738A CN111392968A CN 111392968 A CN111392968 A CN 111392968A CN 202010220738 A CN202010220738 A CN 202010220738A CN 111392968 A CN111392968 A CN 111392968A
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- phosphorus
- town sewage
- removing agent
- composite
- shell powder
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- 239000010865 sewage Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 124
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 124
- 239000011574 phosphorus Substances 0.000 claims abstract description 124
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 53
- 239000002131 composite material Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 241000894006 Bacteria Species 0.000 claims abstract description 11
- 238000000746 purification Methods 0.000 claims abstract description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 38
- 239000000843 powder Substances 0.000 claims description 36
- 238000005245 sintering Methods 0.000 claims description 30
- 239000010802 sludge Substances 0.000 claims description 20
- 239000012798 spherical particle Substances 0.000 claims description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 18
- 239000010935 stainless steel Substances 0.000 claims description 18
- 241000196324 Embryophyta Species 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 14
- 239000010881 fly ash Substances 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000003795 desorption Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 12
- 239000008213 purified water Substances 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 8
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 6
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 6
- 241000237502 Ostreidae Species 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000000645 desinfectant Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 235000020636 oyster Nutrition 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000004659 sterilization and disinfection Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 6
- 235000005273 Canna coccinea Nutrition 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 240000000785 Tagetes erecta Species 0.000 claims description 3
- 235000005881 Calendula officinalis Nutrition 0.000 claims description 2
- 244000071493 Iris tectorum Species 0.000 claims description 2
- 241000383558 Thalia <angiosperm> Species 0.000 claims description 2
- 240000008555 Canna flaccida Species 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 241000628997 Flos Species 0.000 description 4
- 241000234587 Canna Species 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 244000292211 Canna coccinea Species 0.000 description 1
- 241000219100 Rhamnaceae Species 0.000 description 1
- 235000012311 Tagetes erecta Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
-
- 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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to the technical field of water treatment, in particular to a multi-stage ecological treatment method for town sewage; the composite phosphorus removing agent is used for carrying out preliminary physical adsorption on phosphorus in the phosphorus-containing town sewage, and the specific surface area of the composite phosphorus removing agent is increased by forming a plurality of small holes on the surface of the composite phosphorus removing agent, so that the adsorption efficiency of the composite phosphorus removing agent on the phosphorus in the town sewage is effectively improved; the town sewage is sequentially subjected to the action of aerobic denitrification phosphorus accumulating bacteria and the artificial wetland, so that the phosphorus content, COD (chemical oxygen demand) and turbidity in the town sewage are effectively reduced, and the water quality of the town sewage is improved; the purification and treatment efficiency of phosphorus-containing urban sewage is obviously improved through the coordination of multi-stage phosphorus removal such as physical adsorption, aerobic denitrification phosphorus-accumulating bacteria phosphorus removal and artificial wetland phosphorus removal; in addition, the planting of the aquatic plants can also be used as landscape elements to decorate the constructed wetland, so that the constructed wetland becomes a beautiful small landscape-pocket park in villages and towns.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a multi-stage ecological treatment method for town sewage.
Background
The town sewage refers to domestic sewage of urban residents, drainage of institutions, schools, hospitals, commercial service institutions and various public facilities, industrial town sewage allowed to be discharged into a town sewage collection system, initial rainwater and the like. As a large part of urban sewage is domestic sewage, the urban sewage generally contains more phosphorus and organic matters, so that the phosphorus content in the water body is higher, and the water body is eutrophicated. And the town sewage has relatively large COD, BOD and turbidity, and if the town sewage is directly discharged without being treated, eutrophication of a water body can be caused, so that the water quality is influenced, and the environment is polluted. Therefore, the treatment of town sewage becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multistage ecological treatment method for town sewage, which has the advantages that: the method not only can well remove the phosphorus in the town sewage, but also can obviously reduce COD (chemical oxygen demand) and improve turbidity of the town sewage, improves the purification and treatment efficiency of the phosphorus-containing town sewage, and improves the water quality of the town sewage.
In order to achieve the purpose, the invention provides the following technical scheme:
a multi-stage ecological treatment method for town sewage comprises the following steps:
s1, placing the composite phosphorus removing agent in a stainless steel cylinder filter screen with the mesh number of 30-50, then placing the stainless steel cylinder filter screen filled with the composite phosphorus removing agent in a sedimentation tank of a distributed town sewage treatment device, adsorbing for 15-30 days under the condition, taking out the stainless steel cylinder filter screen, and carrying out physical desorption on the taken out composite phosphorus removing agent, wherein the composite phosphorus removing agent after desorption treatment can be reused;
s2, discharging the upper-layer town sewage containing the phosphorus town sewage treated by the S1 into an oxidation pond, and further removing phosphorus in the town sewage by using aerobic denitrifying phosphorus accumulating bacteria and a sludge discharge amount control mode;
s3, discharging the town sewage containing phosphorus after the treatment of S2 to a vertical flow artificial wetland for further dephosphorization; adding a disinfectant into the treated town sewage effluent area for further disinfection treatment, and collecting the treated town sewage effluent area into an effluent pool through a pipeline to achieve standard discharge or recycle;
the vertical flow artificial wetland comprises a water inlet pipe, a water outlet pipe, a ventilating pipe, a filtering layer consisting of a plurality of layers of fillers, a bottom impermeable layer and aquatic plants with a certain purification function; the multilayer filler comprises the following components from top to bottom in sequence: a slag layer, a fly ash layer and a river sand layer.
By adopting the technical scheme, the phosphorus in the phosphorus-containing town sewage is subjected to preliminary physical adsorption by the composite phosphorus removal agent, the phosphorus-containing town sewage is subjected to adsorption treatment by the composite phosphorus removal agent, and then the phosphorus removal effect on the town sewage can be remarkably improved by using the aerobic denitrifying phosphorus-accumulating bacteria, so that the phosphorus content in the phosphorus-containing town sewage is further reduced. Simultaneously, the COD and BOD content in the town sewage is effectively reduced, and the water quality of the town sewage is improved. Finally, the phosphorus in the town sewage is treated again by the artificial wetland dephosphorization method, so that the treatment effect and quality of the phosphorus-containing town sewage are improved. Meanwhile, the artificial wetland is used for landscape construction, centralized greening is fully utilized, beautiful landscape is added for rest and entertainment of residents, the surrounding ecological environment is improved, and the waterlogging draining capability is improved.
The invention is further configured to: the preparation process of the composite phosphorus removal agent in the step S1 comprises the following steps:
a. cleaning oyster shells with clear water, then crushing and grinding, then sieving the obtained oyster shell powder with a 200-plus-material 300-mesh sieve, then placing the obtained oyster shell powder in a high-temperature sintering furnace, raising the temperature in the high-temperature sintering furnace to 480-plus-material 560 ℃, sintering for 3-4h at the temperature, then cooling the oyster shell powder to room temperature under natural conditions, and taking out and storing the oyster shell powder for later use;
b. b, uniformly mixing and stirring the oyster shell powder obtained in the step a and purified water sludge with the mass of 35-60% of the oyster shell powder, adding hydrochloric acid solution with the concentration of 0.3-0.6 mol/L into a mixed component consisting of the oyster shell powder and the purified water sludge, adjusting the pH value of the mixed component to 3.3-3.8, soaking the mixed component at the temperature of 35-45 ℃ for 12-18h, filtering after soaking, and storing the obtained mixed filter residue for later use;
c. and c, adding a proper amount of hydroxyethyl cellulose thickener into the mixed filter residue obtained in the step b, making the mixed filter residue into spherical particles with the diameter of 2.0-2.5cm, carrying out hole opening treatment on the surfaces of the spherical particles, placing the spherical particles in a high-temperature sintering furnace for sintering and forming, and naturally cooling to room temperature to obtain the finished product of the composite phosphorus removing agent.
By adopting the technical scheme, the composite phosphorus removing agent is used for carrying out preliminary physical adsorption on phosphorus in the phosphorus-containing urban sewage, and the specific surface area of the composite phosphorus removing agent is increased by forming a plurality of small holes on the surface of the composite phosphorus removing agent, so that the adsorption efficiency of the composite phosphorus removing agent on the phosphorus in the urban sewage is effectively improved. In addition, the oyster shell and the purified water sludge are used as raw materials for preparing the composite phosphorus removal agent, so that the effect of removing phosphorus in town sewage is obviously improved, the aim of changing waste into valuable is fulfilled, resources are saved, and the pollution to the environment is reduced.
The invention is further configured to: the aquatic plants in the S4 are selected from any three of canna, Philippine arborescens, marigold, iris tectorum and Thalia flower.
By adopting the technical scheme, the aquatic plants can reduce the turbidity and the bacterial content of the town sewage by using phosphorus in the town sewage in a certain degree, effectively reduce the phosphorus content in the town sewage, and realize the further treatment of the town sewage. In addition, the planting of the aquatic plants can also be used as landscape elements to decorate the constructed wetland, so that the constructed wetland becomes a beautiful small landscape-pocket park in villages and towns. Meanwhile, the environment and the landscape of the artificial wetland are more beautiful, and the artificial wetland can be used as a good place for daily leisure of people.
The invention is further configured to: the thickness ratio of the slag layer, the fly ash layer and the river sand layer in the step S4 is 1: 1.5-2.0: 3.4-4.2.
By adopting the technical scheme, the cooperation of the slag layer, the fly ash and the river sand layer can adsorb and purify town sewage which is contacted with the slag layer again, so that the water quality of the treated town sewage is better than that of the prior art, and the treatment efficiency and effect of the phosphorus-containing town sewage are effectively improved.
In summary, the invention has the following advantages:
1. according to the invention, the composite phosphorus removing agent is used for carrying out primary physical adsorption on phosphorus in the phosphorus-containing town sewage, and then a plurality of small holes are formed in the surface of the composite phosphorus removing agent, so that the specific surface area of the composite phosphorus removing agent is increased, and the adsorption efficiency of the composite phosphorus removing agent on the phosphorus in the town sewage is effectively improved;
2. after the phosphorus-containing town sewage is adsorbed by the composite phosphorus removal agent, the phosphorus removal effect on the town sewage can be obviously improved by using the aerobic denitrifying phosphorus accumulating bacteria, so that the phosphorus content in the phosphorus-containing town sewage is further reduced. Meanwhile, the turbidity and the bacterial content of the town sewage and the COD and the BOD in the town sewage can be effectively reduced, the water quality of the town sewage is improved, and the treatment effect and the quality of the phosphorus-containing town sewage are also effectively improved;
3. the invention obviously improves the purification and treatment efficiency of the phosphorus-containing urban sewage through the coordination of multi-stage phosphorus removal such as physical adsorption, aerobic denitrification phosphorus-accumulating bacteria phosphorus removal, chemical phosphorus removal, artificial wetland phosphorus removal and the like. In addition, the oyster shell and the purified water sludge are used as raw materials for preparing the composite phosphorus removal agent, so that the effect of removing phosphorus in town sewage is obviously improved, the aim of changing waste into valuable is fulfilled, resources are saved, and the pollution to the environment is reduced.
4. The planting of the aquatic plants can also be used as landscape elements to decorate the artificial wetland, so that the artificial wetland becomes a beautiful small landscape-pocket park in villages and towns. Meanwhile, the artificial wetland is used for landscape construction, centralized greening is fully utilized, beautiful landscape is added for rest and entertainment of residents, the surrounding ecological environment is improved, and the waterlogging draining capability is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
a multi-stage ecological treatment method for town sewage comprises the following steps:
s1, placing the composite phosphorus removing agent in a stainless steel cylinder filter screen with the mesh number of 30-50, then placing the stainless steel cylinder filter screen filled with the composite phosphorus removing agent in a sedimentation tank of a distributed town sewage treatment device, adsorbing for 15 days under the condition, taking out the stainless steel cylinder filter screen, and carrying out physical desorption on the taken out composite phosphorus removing agent, wherein the composite phosphorus removing agent after desorption treatment can be reused;
s2, discharging the upper-layer town sewage containing the phosphorus town sewage treated by the S1 into an oxidation pond, and further removing phosphorus in the town sewage by using aerobic denitrifying phosphorus accumulating bacteria and a sludge discharge amount control mode;
s3, discharging the town sewage containing phosphorus after the treatment of S2 to a vertical flow artificial wetland for further dephosphorization; adding a disinfectant into the treated town sewage effluent area for further disinfection treatment, and collecting the treated town sewage effluent area into an effluent pool through a pipeline to achieve standard discharge or recycle;
the vertical flow artificial wetland comprises a water inlet pipe, a water outlet pipe, a ventilating pipe, a filter layer consisting of a plurality of layers of fillers, a bottom impermeable layer and aquatic plants with a certain purification function; the multilayer filler comprises the following components from top to bottom in sequence: a slag layer, a fly ash layer and a river sand layer.
The preparation process of the composite phosphorus removal agent in the step S1 comprises the following steps:
cleaning oyster shells with clear water, crushing and grinding, then sieving the obtained oyster shell powder with a 200-mesh sieve, then placing the obtained oyster shell powder in a high-temperature sintering furnace, raising the temperature in the high-temperature sintering furnace to 480 ℃, sintering for 3 hours at the temperature, then cooling the oyster shell powder to room temperature under natural conditions, taking out and storing for later use;
b, uniformly mixing and stirring the oyster shell powder obtained in the step a and purified water sludge with the mass of 35% of the oyster shell powder, adding hydrochloric acid solution with the concentration of 0.3 mol/L into a mixed component consisting of the oyster shell powder and the purified water sludge, adjusting the pH value of the mixed component to 3.3, soaking the mixed component for 12 hours at the temperature of 35 ℃, filtering after soaking, and storing the obtained mixed filter residue for later use;
c. and c, adding a proper amount of hydroxyethyl cellulose thickener into the mixed filter residue obtained in the step b, making the mixed filter residue into spherical particles with the diameter of 2.0cm, carrying out hole opening treatment on the surfaces of the spherical particles, placing the spherical particles in a high-temperature sintering furnace for sintering and forming, and naturally cooling to room temperature to obtain the finished product of the composite phosphorus removing agent.
S3 the aquatic plant is selected from canna indica, Philippine Rhamnaceae, and Tagetes erecta.
In the step S3, the thickness ratio of the slag layer, the fly ash layer and the river sand layer is 1: 1.5: 3.4.
example 2:
a multi-stage ecological treatment method for town sewage comprises the following steps:
s1, placing the composite phosphorus removing agent in a stainless steel cylinder filter screen with the mesh number of 30-50, then placing the stainless steel cylinder filter screen filled with the composite phosphorus removing agent in a sedimentation tank of a distributed town sewage treatment device, adsorbing for 20 days under the condition, taking out the stainless steel cylinder filter screen, and carrying out physical desorption on the taken out composite phosphorus removing agent, wherein the composite phosphorus removing agent after desorption treatment can be reused;
s2, discharging the upper-layer town sewage containing the phosphorus town sewage treated by the S1 into an oxidation pond, and further removing phosphorus in the town sewage by using aerobic denitrifying phosphorus accumulating bacteria and a sludge discharge amount control mode;
s3, discharging the town sewage containing phosphorus after the treatment of S2 to a vertical flow artificial wetland for further dephosphorization; adding a disinfectant into the treated town sewage effluent area for further disinfection treatment, and collecting the treated town sewage effluent area into an effluent pool through a pipeline to achieve standard discharge or recycle;
the vertical flow artificial wetland comprises a water inlet pipe, a water outlet pipe, a ventilating pipe, a filter layer consisting of a plurality of layers of fillers, a bottom impermeable layer and aquatic plants with a certain purification function; the multilayer filler comprises the following components from top to bottom in sequence: a slag layer, a fly ash layer and a river sand layer.
The preparation process of the composite phosphorus removal agent in the step S1 comprises the following steps:
cleaning oyster shells with clear water, crushing and grinding, then sieving the obtained oyster shell powder with a 250-mesh sieve, then placing the obtained oyster shell powder in a high-temperature sintering furnace, raising the temperature in the high-temperature sintering furnace to 500 ℃, sintering for 3 hours at the temperature, then cooling the oyster shell powder to room temperature under natural conditions, taking out and storing for later use;
b, uniformly mixing and stirring the oyster shell powder obtained in the step a and 45% of purified water sludge by mass, adding a hydrochloric acid solution with the concentration of 0.4 mol/L into a mixed component consisting of the oyster shell powder and the purified water sludge, adjusting the pH value of the mixed component to 3.5, soaking for 14 hours at the temperature of 40 ℃, filtering after soaking, and storing the obtained mixed filter residue for later use;
c. and c, adding a proper amount of hydroxyethyl cellulose thickener into the mixed filter residue obtained in the step b, making the mixed filter residue into spherical particles with the diameter of 2.2cm, carrying out hole opening treatment on the surfaces of the spherical particles, placing the spherical particles in a high-temperature sintering furnace for sintering and forming, and naturally cooling to room temperature to obtain the finished product of the composite phosphorus removing agent.
S3 the aquatic plants are selected from canna, iris and Reli flower.
In the step S3, the thickness ratio of the slag layer, the fly ash layer and the river sand layer is 1: 1.6: 3.8.
example 3:
a multi-stage ecological treatment method for town sewage comprises the following steps:
s1, placing the composite phosphorus removing agent in a stainless steel cylinder filter screen with the mesh number of 30-50, then placing the stainless steel cylinder filter screen filled with the composite phosphorus removing agent in a sedimentation tank of a distributed town sewage treatment device, adsorbing for 25 days under the condition, taking out the stainless steel cylinder filter screen, and carrying out physical desorption on the taken out composite phosphorus removing agent, wherein the composite phosphorus removing agent after desorption treatment can be reused;
s2, discharging the upper-layer town sewage containing the phosphorus town sewage treated by the S1 into an oxidation pond, and further removing phosphorus in the town sewage by using aerobic denitrifying phosphorus accumulating bacteria and a sludge discharge amount control mode;
s3, discharging the town sewage containing phosphorus after the treatment of S2 to a vertical flow artificial wetland for further dephosphorization; adding a disinfectant into the treated town sewage effluent area for further disinfection treatment, and collecting the treated town sewage effluent area into an effluent pool through a pipeline to achieve standard discharge or recycle;
the vertical flow artificial wetland comprises a water inlet pipe, a water outlet pipe, a ventilating pipe, a filter layer consisting of a plurality of layers of fillers, a bottom impermeable layer and aquatic plants with a certain purification function; the multilayer filler comprises the following components from top to bottom in sequence: a slag layer, a fly ash layer and a river sand layer.
The preparation process of the composite phosphorus removal agent in the step S1 comprises the following steps:
cleaning oyster shells with clear water, crushing and grinding, then sieving the obtained oyster shell powder with a 280-mesh sieve, then placing the obtained oyster shell powder in a high-temperature sintering furnace, raising the temperature in the high-temperature sintering furnace to 540 ℃, sintering for 4 hours at the temperature, then cooling the oyster shell powder to room temperature under natural conditions, taking out and storing for later use;
b, uniformly mixing and stirring the oyster shell powder obtained in the step a and 50% of purified water sludge by mass, adding a hydrochloric acid solution with the concentration of 0.5 mol/L into a mixed component consisting of the oyster shell powder and the purified water sludge, adjusting the pH value of the mixed component to 3.7, soaking for 16 hours at the temperature of 40 ℃, filtering after soaking, and storing the obtained mixed filter residue for later use;
c. and c, adding a proper amount of hydroxyethyl cellulose thickener into the mixed filter residue obtained in the step b, making the mixed filter residue into spherical particles with the diameter of 2.4cm, carrying out hole opening treatment on the surfaces of the spherical particles, placing the spherical particles in a high-temperature sintering furnace for sintering and forming, and naturally cooling to room temperature to obtain the finished product of the composite phosphorus removing agent.
S3 the aquatic plants are selected from radix Rhapontici, flos Tagetis Erectae, and flos Helianthi.
In the step S3, the thickness ratio of the slag layer, the fly ash layer and the river sand layer is 1: 1.8: 4.0.
example 4:
a multi-stage ecological treatment method for town sewage comprises the following steps:
s1, placing the composite phosphorus removing agent in a stainless steel cylinder filter screen with the mesh number of 30-50, then placing the stainless steel cylinder filter screen filled with the composite phosphorus removing agent in a sedimentation tank of a distributed town sewage treatment device, adsorbing for 30 days under the condition, taking out the stainless steel cylinder filter screen, and carrying out physical desorption on the taken out composite phosphorus removing agent, wherein the composite phosphorus removing agent after desorption treatment can be reused;
s2, discharging the upper-layer town sewage containing the phosphorus town sewage treated by the S1 into an oxidation pond, and further removing phosphorus in the town sewage by using aerobic denitrifying phosphorus accumulating bacteria and a sludge discharge amount control mode;
s3, discharging the town sewage containing phosphorus after the treatment of S2 to a vertical flow artificial wetland for further dephosphorization; adding a disinfectant into the treated town sewage effluent area for further disinfection treatment, and collecting the treated town sewage effluent area into an effluent pool through a pipeline to achieve standard discharge or recycle;
the vertical flow artificial wetland comprises a water inlet pipe, a water outlet pipe, a ventilating pipe, a filter layer consisting of a plurality of layers of fillers, a bottom impermeable layer and aquatic plants with a certain purification function; the multilayer filler comprises the following components from top to bottom in sequence: a slag layer, a fly ash layer and a river sand layer.
The preparation process of the composite phosphorus removal agent in the step S1 comprises the following steps:
cleaning oyster shells with clear water, crushing and grinding, then sieving the obtained oyster shell powder with a 300-mesh sieve, then placing the obtained oyster shell powder in a high-temperature sintering furnace, raising the temperature in the high-temperature sintering furnace to 560 ℃, sintering for 4 hours at the temperature, then cooling the oyster shell powder to room temperature under natural conditions, taking out and storing for later use;
b, uniformly mixing and stirring the oyster shell powder obtained in the step a and water-purified sludge with the mass of 60% of the oyster shell powder, adding hydrochloric acid solution with the concentration of 0.6 mol/L into a mixed component consisting of the oyster shell powder and the water-purified sludge, adjusting the pH value of the mixed component to 3.8, soaking the mixed component for 18 hours at the temperature of 45 ℃, filtering after soaking, and storing the obtained mixed filter residue for later use;
c. and c, adding a proper amount of hydroxyethyl cellulose thickener into the mixed filter residue obtained in the step b, making the mixed filter residue into spherical particles with the diameter of 2.5cm, carrying out hole opening treatment on the surfaces of the spherical particles, placing the spherical particles in a high-temperature sintering furnace for sintering and forming, and naturally cooling to room temperature to obtain the finished product of the composite phosphorus removing agent.
S3 the aquatic plants are selected from radix Rhapontici, flos Tagetis Erectae, and flos Helianthi.
In the step S3, the thickness ratio of the slag layer, the fly ash layer and the river sand layer is 1: 2.0: 4.2.
and (3) performance detection:
the phosphorus-containing town sewage before and after being treated by the process provided by the invention is respectively detected, the detection items comprise phosphorus content, COD and turbidity, and the obtained data are recorded in the following table:
from the relevant data in the table, it can be seen that the phosphorus-containing town sewage treatment process provided by the invention not only has good effect of removing phosphorus in town sewage, but also can remarkably reduce COD in the town sewage and improve turbidity of the town sewage. The phosphorus-containing town sewage treatment process provided by the invention has a good effect in the field of water treatment and is more suitable for popularization.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (4)
1. A multi-stage ecological treatment method for town sewage is characterized by comprising the following steps:
s1, placing the composite phosphorus removing agent in a stainless steel cylinder filter screen with the mesh number of 30-50, then placing the stainless steel cylinder filter screen filled with the composite phosphorus removing agent in a sedimentation tank of a distributed town sewage treatment device, adsorbing for 15-30 days under the condition, taking out the stainless steel cylinder filter screen, and carrying out physical desorption on the taken out composite phosphorus removing agent, wherein the composite phosphorus removing agent after desorption treatment can be reused;
s2, discharging the upper-layer town sewage containing the phosphorus town sewage treated by the S1 into an oxidation pond, and further removing phosphorus in the town sewage by using aerobic denitrifying phosphorus accumulating bacteria and a sludge discharge amount control mode;
s3, discharging the town sewage containing phosphorus after the treatment of S2 to a vertical flow artificial wetland for further dephosphorization; adding a disinfectant into the treated town sewage effluent area for further disinfection treatment, and collecting the treated town sewage effluent area into an effluent pool through a pipeline to achieve standard discharge or recycle;
the vertical flow artificial wetland comprises a water inlet pipe, a water outlet pipe, a ventilating pipe, a filtering layer consisting of a plurality of layers of fillers, a bottom impermeable layer and aquatic plants with a certain purification function; the multilayer filler comprises the following components from top to bottom in sequence: a slag layer, a fly ash layer and a river sand layer.
2. The multi-stage ecological treatment method for town sewage according to claim 1, wherein the preparation process of the composite dephosphorizing agent in the step S1 comprises the following steps:
a. cleaning oyster shells with clear water, then crushing and grinding, then sieving the obtained oyster shell powder with a 200-plus-material 300-mesh sieve, then placing the obtained oyster shell powder in a high-temperature sintering furnace, raising the temperature in the high-temperature sintering furnace to 480-plus-material 560 ℃, sintering for 3-4h at the temperature, then cooling the oyster shell powder to room temperature under natural conditions, and taking out and storing the oyster shell powder for later use;
b. b, uniformly mixing and stirring the oyster shell powder obtained in the step a and purified water sludge with the mass of 35-60% of the oyster shell powder, adding hydrochloric acid solution with the concentration of 0.3-0.6 mol/L into a mixed component consisting of the oyster shell powder and the purified water sludge, adjusting the pH value of the mixed component to 3.3-3.8, soaking the mixed component at the temperature of 35-45 ℃ for 12-18h, filtering after soaking, and storing the obtained mixed filter residue for later use;
c. and c, adding a proper amount of hydroxyethyl cellulose thickener into the mixed filter residue obtained in the step b, making the mixed filter residue into spherical particles with the diameter of 2.0-2.5cm, carrying out hole opening treatment on the surfaces of the spherical particles, placing the spherical particles in a high-temperature sintering furnace for sintering and forming, and naturally cooling to room temperature to obtain the finished product of the composite phosphorus removing agent.
3. The multi-stage ecological treatment method for town sewage as claimed in claim 1, wherein: the aquatic plants in the S3 are selected from any three of canna, Philippine arborescens, marigold, iris tectorum and Thalia flower.
4. The multi-stage ecological treatment method for town sewage as claimed in claim 1, wherein: the thickness ratio of the slag layer, the fly ash layer and the river sand layer in the step S3 is 1: 1.5-2.0: 3.4-4.2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897806A (en) * | 2021-01-19 | 2021-06-04 | 无锡碧泓达环境科技有限公司 | River channel dephosphorization process |
| CN115196841A (en) * | 2022-08-25 | 2022-10-18 | 威海市大有机械制造有限公司 | Organic sewage living bacterium animal and plant purification process |
-
2020
- 2020-03-26 CN CN202010220738.4A patent/CN111392968A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897806A (en) * | 2021-01-19 | 2021-06-04 | 无锡碧泓达环境科技有限公司 | River channel dephosphorization process |
| CN115196841A (en) * | 2022-08-25 | 2022-10-18 | 威海市大有机械制造有限公司 | Organic sewage living bacterium animal and plant purification process |
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