CN110963644A - High-nitrate industrial wastewater denitrification pretreatment system, method and application thereof - Google Patents
High-nitrate industrial wastewater denitrification pretreatment system, method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
Abstract
The invention relates to a high-nitrate industrial wastewater denitrification pretreatment system, a high-nitrate industrial wastewater denitrification pretreatment method and application thereof, and belongs to the technical field of sewage treatment. The invention adopts the autotrophic denitrification filter as a pretreatment system of the wastewater, on one hand, the high-activity biological filter material prepared by the sulfur-containing tailings is used, no additional organic carbon source is needed, the sulfide is used as an electron donor, and the thiobacillus denitrificans is used for autotrophic denitrification. The sewage treatment pretreatment, which selects a biological filter as a pretreatment system, is not reported at present. The nitrate nitrogen concentration in the high-nitrate industrial wastewater can be greatly reduced through autotrophic denitrification of thiobacillus denitrificans in the biological filter, the Total Nitrogen (TN) concentration is reduced to be lower than 45mg/L, the requirement of the sewage water quality standard of discharging the sewage water into town sewers is met, the treated wastewater is treated by a subsequent sewage treatment plant, and the standard discharge of the total nitrogen of the effluent water can be realized.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a high-nitrate industrial wastewater denitrification pretreatment system, a high-nitrate industrial wastewater denitrification pretreatment method and application of the high-nitrate industrial wastewater denitrification pretreatment system.
Background
With the rapid development of urban construction and industry, the amount of sewage is increasing day by day. At present, municipal sewage in China is generally converged into municipal or industrial park drainage facilities. Because the industrial wastewater has complex components, large fluctuation of water quality and water quantity and large impact of high-load inflow on a biochemical system of a sewage treatment plant, microorganisms can be inactivated, and the process operation is paralyzed for a short time, so that the sewage treatment efficiency is directly influenced.
The sewage treatment plant process matched with the drainage system of the municipal or industrial park mainly aims at the condition that the pollutants are COD and BOD5Total nitrogen, nitrate nitrogen, total phosphorus, SS and the like, the main process mostly adopts an activated sludge method such as an oxidation ditch, SBR and the like, the water quality requirement of the pollutant entering a sewage treatment plant is met, and the biodegradability is more than 0.3; the method has no specific treatment capability on some pollutants containing nitrogen complex benzene ring structures in the wastewater of pesticide plants, biological pharmaceutical plants and chemical plants, and the pollutants inhibit the operation of biochemical treatment processes. Therefore, the management department requires that the industrial wastewater must be pretreated when being connected to the municipal or industrial park pipe network, so that the wastewater meets the pipe network connection standard. At present, the discharge of industrial wastewater into town sewers (municipal or industrial park pipe networks) generally needs to meet the requirements of the water quality standard of wastewater discharge into town sewers (GB/T31962-2015) or the comprehensive wastewater discharge standard (GB 8978-1996).
The high-nitrate wastewater of the chemical plants containing nitrogen in the pesticide plants, the biological pharmaceutical plants and the products has complex components, the total nitrogen and the nitrate nitrogen are far higher than the pipe network access standard, and the wastewater has high nitrogen, low carbon, high salt, contains a large amount of substances which are difficult to degrade, has poor biodegradability, has unsatisfactory wastewater treatment effect under the condition of unchanged original process conditions, and the effluent quality is difficult to reach the discharge standard. Therefore, the sewage needs to pass through an in-plant pretreatment unit, the pollution load is reduced, the requirements of the water quality standard (GB/T31962-2015) for sewage discharged into urban sewers are met, and the TN concentration is reduced to be below 45mg/L so as to meet the water quality requirements of inlet water of a subsequent sewage treatment plant and ensure that the whole treatment process system operates efficiently and stably.
Because of high nitrogen, low carbon and poor biodegradability of the high-nitrate industrial wastewater, the prior denitrification technology mainly comprises adding an organic carbon source and inorganic substances. An organic carbon source is added to meet the requirement of denitrification of denitrifying bacteria on the carbon source, but the excessive addition of the organic carbon source causes the risk of secondary pollution, the treatment cost is increased, and effluent cannot reach the discharge standard; inorganic matters can be added as electron donors of denitrifying bacteria, autotrophic denitrification is realized, the denitrification efficiency of the system is improved, and the problem of lack of carbon sources of inlet water is solved.
The biofilter is usually used for three-stage (advanced) treatment of sewage (wastewater) treatment, is used for further nitrogen and phosphorus removal of the sewage (wastewater), and realizes standard discharge of effluent and upgrading and reconstruction of the existing sewage treatment. The application of the biological filter to sewage (waste water) pretreatment is not reported in the literature. The autotrophic denitrification filter tank is used as a pretreatment system of high-nitrate industrial wastewater, on one hand, a high-activity biological filter material prepared from sulfur-containing tailings is used, no additional organic carbon source is needed, sulfide is used as an electron donor, and thiobacillus denitrificans is used for autotrophic denitrification.
Disclosure of Invention
The invention aims to solve the problems, provides a high-nitrate industrial wastewater denitrification pretreatment system, a high-nitrate industrial wastewater denitrification pretreatment method and application thereof, and solves the technical problems of increased treatment cost and low efficiency in the traditional pretreatment by adding an organic carbon source.
The invention realizes the purpose through the following technical scheme:
the invention provides a high-nitrate industrial wastewater denitrification pretreatment system, which comprises a cylinder body, wherein:
a filter plate is arranged in the cylinder body, a filter material layer is arranged above the filter plate, and the filter material layer is filled with autotrophic denitrification biological filter materials;
the bottom end of the barrel is provided with a sewage inlet, the upper end of the barrel is provided with a sewage outlet, the sewage inlet is connected with sewage to be treated through a sewage inlet pipeline, a peristaltic pump is arranged on the sewage inlet pipeline, and the sewage outlet is connected with a subsequent conventional sewage biological denitrification system through a sewage outlet pipeline; the high nitrate industrial wastewater to be treated adopts an upward flow mode, water is fed through a peristaltic pump, the water is uniformly distributed through a filter plate and then is treated through an autotrophic denitrification biological filter material, and the treated wastewater is output to a subsequent biological sewage denitrification system through a sewage outlet to complete pretreatment;
sulfate is generated in the sewage denitrification pretreatment process to influence the denitrification effect, so that the bottom end of the cylinder body is also provided with a back flush water outlet, the upper end of the cylinder body is also provided with a back flush water inlet, and the back flush water inlet and the back flush water outlet are connected with an external back flush device and used for back flushing biological filter materials in the pretreatment system to realize the repeated cyclic utilization of the biological filter materials;
the upper end of the filter material layer is lower than the sewage outlet and the back flush water inlet;
the upper end of the cylinder body is also provided with an exhaust port for exhausting nitrogen and other gases generated in the sewage pretreatment process.
As a further optimization scheme of the invention, the average pore diameter of the filter plate is 10 mm.
As a further optimized scheme of the invention, the autotrophic denitrification biological filter material is prepared by taking sulfur-containing tailings as a raw material, and comprises the following components: the preparation method of the sulfur-containing tailings, the limestone, the sludge biochar and the binder after the limestone activation treatment comprises the following steps:
(1) activation treatment of sulfur-containing tailings
Crushing the sulfur-containing tailings, adding limestone, uniformly mixing, and performing activation treatment in an inert atmosphere to obtain activated sulfur-containing tailings;
(2) preparation of sludge biochar
Drying the residual sludge in the sewage treatment process, adding zinc chloride for activation, and carrying out carbonization treatment in a nitrogen atmosphere to obtain sludge biochar;
(3) grinding the activated sulfur-containing tailings and the sludge biochar, mixing the ground activated sulfur-containing tailings and the sludge biochar with limestone, adding a binder for bonding, and preparing the biological filter material with uniform particle size.
As a further optimization scheme of the invention, the height of the filter material layer is 1m, and the average particle size of the filter material is 30-40 mm.
As a further optimization scheme of the invention, the pretreatment system further comprises a support and a clamp arranged on the support, and the cylinder body is vertically fixed on the support through the clamp.
As a further optimization of the invention, the peristaltic pump is a peristaltic metering pump for controlling the amount of wastewater to be treated flowing into the pretreatment system.
The invention also provides a method for pretreating high-nitrate industrial wastewater based on the high-nitrate industrial wastewater denitrification pretreatment system, which comprises the following steps:
the method comprises the following steps: film hanging and starting of the biological filter:
taking nitrate-containing wastewater as influent water, taking return sludge of a sewage plant as inoculated sludge, mixing the nitrate-containing wastewater with the inoculated sludge, inputting the mixture through a sewage water inlet to carry out biofilm formation, and continuously operating until a layer of light brown biofilm is formed on the surface of a biological filter material, thereby indicating that the biofilm formation is successful;
step two: pretreatment of high nitrate industrial wastewater
Inputting high-nitrate industrial wastewater to be treated into the cylinder body through a sewage inlet, controlling the rising flow rate of the wastewater, enabling a biological filter material to be in a micro-expansion state in a pretreatment system for autotrophic denitrification and denitrification so as to remove nitrate in the wastewater, discharging the treated wastewater through a wastewater outlet pipe, and feeding the wastewater into a next sewage biological denitrification system;
step three: back flushing
And after the pretreatment system operates for a certain time, the backwashing system is used for backwashing the biological filter material in the pretreatment system.
As a further optimization scheme of the invention, in the second step, the rising flow rate of the wastewater is 10-15m/h, and the retention time of the wastewater in the biological filter material is 20-25 min.
The invention also provides application of the high-nitrate industrial wastewater denitrification pretreatment system in pretreatment equipment used as a sewage biological denitrification treatment process.
The principle of the invention is as follows:
on the one hand, the high-activity biological filter material prepared by utilizing the sulfur-containing tailings does not need to be added with an organic carbon source, and the sulfur compounds are used as electron donors, so that the thiobacillus denitrificans performs autotrophic denitrification. The sewage treatment pretreatment, which selects a biological filter as a pretreatment system, is not reported at present. The nitrate nitrogen concentration in the high-nitrate industrial wastewater can be greatly reduced through autotrophic denitrification of thiobacillus denitrificans in the biological filter, the TN concentration is reduced to be lower than 45mg/L, the requirement of wastewater discharge to town sewer water quality standard (GB/T31962-2015) is met, the treated wastewater is treated by a subsequent sewage treatment plant, and the total nitrogen of the effluent can be discharged after reaching the standard.
The invention has the beneficial effects that:
1) the concentration of nitrate in the sewage can be reduced after the pretreatment of the biological filter, so that the C/N ratio of the effluent of the biological filter can be improved, a proper C/N is provided for microorganisms in the conventional sewage biological denitrification process, and TN and nitrate of the effluent of the high-nitrate industrial wastewater can be discharged up to the standard without adding an organic carbon source.
2) The high-activity biological filter material prepared by using the sulfur-containing tailings, sulfide is used as an electron donor, and an autotrophic denitrification is realized without adding a carbon source under the action of thiobacillus denitrificans. The biological filter material with high activity is prepared by taking sulfur-containing tailings and residual sludge of a sewage plant as main raw materials, limestone as a neutralizing agent and aluminum dihydrogen phosphate as a binder, wherein the main raw materials are solid wastes in the environment, and the biological filter material prepared by taking the sulfur-containing tailings and the residual sludge as the raw materials is used for denitrification of high-nitrate industrial wastewater, so that the aim of treating wastes with processes of wastes against one another is fulfilled.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a graph of nitrate nitrogen in wastewater to be treated according to example 2 as a function of the system operating time;
FIG. 4 is a graph of total nitrogen of wastewater to be treated as a function of system operation time in example 2;
FIG. 5 is a graph of nitrate nitrogen in wastewater to be treated according to example 3 as a function of the system operating time;
FIG. 6 is a graph of total nitrogen of wastewater to be treated as a function of system operation time in example 3;
FIG. 7 is a graph of nitrate nitrogen as a function of run time for different biofilter treatments of example 4;
FIG. 8 is a graph of total nitrogen as a function of run time for different biofilter treatments of example 4.
In the figure: 1-bracket, 2-cylinder, 21-sewage inlet, 22-sewage outlet, 23-backwash outlet, 24-backwash inlet, 25-exhaust outlet, 3-hoop, 4-filter plate, 5-peristaltic pump, 6-filter material layer.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Example 1
A high nitrate industrial wastewater denitrification pretreatment system is shown in figures 1-2 and comprises a support 1 and a plurality of cylinders 2 arranged on the support 1, wherein the cylinders 2 are vertically connected to the support 1 through clamps 3. It should be noted that the pretreatment system of the present invention may include one or more cartridges 2, which are included in the scope of the present invention.
The inside of the cylinder body 2 is provided with a filter plate 4, the average aperture of the filter plate 4 is 10mm, the filter plate 4 is used for distributing water uniformly, and then the water is treated by a biological filter material which is described below.
The bottom of barrel 2 is equipped with sewage water inlet 21, the upper end of barrel 2 is equipped with sewage water outlet 22, sewage water inlet 21 passes through the sewage inlet pipe and is connected with pending sewage, is equipped with peristaltic pump 5 on the sewage inlet pipe, and further, this peristaltic pump 5 is a peristaltic metering pump, can control the volume of the pending sewage that flows into among the pretreatment systems. A plurality of cylinders 2 can share the same peristaltic pump 5, and wastewater to be treated is input into the pretreatment system through the peristaltic pump 5.
The bottom end of the cylinder body 2 is also provided with a back flush water outlet 23, the upper end of the cylinder body 2 is also provided with a back flush water inlet 24, the back flush water outlet 23 and the back flush water inlet 24 are connected with an external back flush device, when the system runs for a period of time, sulfate can be generated in the biological filter material to influence the denitrification effect, and at the moment, the back flush device is started, so that the substances influencing the denitrification effect can be removed, and the recycling of the biological filter material is realized.
A filter material layer 6 is arranged above the filter plate 4, the filter material layer 6 is formed by filling autotrophic denitrification biological filter materials, in the embodiment, the height of the filter material layer 6 is 35cm, the average diameter is 30-40mm, the specification of the filter material layer 6 is not limited to the above, and the filter material layer can be correspondingly adjusted according to the amount of sewage to be treated by the pretreatment system.
The upper end of the filter material layer 6 is lower than the sewage outlet 22 and the back flush outlet 23, and the distance between the upper end of the filter material layer 6 and the sewage outlet 22 is reserved to be about 5 cm.
The upper end of the cylinder 2 is also provided with an exhaust port 25 for exhausting gases such as nitrogen generated in the pretreatment process.
Regarding the autotrophic denitrification biological filter material, the embodiment adopts a biological filter material prepared by using sulfur-containing tailings as raw materials, and the components of the biological filter material comprise the sulfur-containing tailings subjected to limestone activation treatment, limestone, sludge biochar and aluminum dihydrogen phosphate binder:
(1) activation treatment of sulfur-containing tailings
Crushing the sulfur-containing tailings, adding limestone, uniformly mixing (according to a mass ratio of 9:1), performing activation treatment for 2 hours at 400 ℃ in an inert atmosphere (nitrogen atmosphere) to obtain activated sulfur-containing tailings, and performing ball milling on the activated sulfur-containing tailings for later use;
(2) preparation of sludge biochar
Taking residual sludge in the sewage treatment process, drying at 105 ℃, adding into 2-5mol/L zinc chloride solution for soaking, performing activation treatment, then drying at 105 ℃, then placing in a nitrogen atmosphere furnace, carbonizing at 600 ℃, preserving heat for 2 hours to obtain sludge biochar, and grinding for later use;
(3) preparation of biological filter material
Taking 70 parts by weight of the tailings activated in the step (1), 20 parts by weight of the sludge biochar in the step (2), 5 parts by weight of limestone and 5 parts by weight of aluminum dihydrogen phosphate (binder), uniformly mixing, and adding into a granulator to prepare the biological filter material with the particle size of about 10-20 mm.
Example 2
This example provides a method for pre-treating high nitrate content industrial wastewater by using the pre-treatment system of example 1, which comprises:
the method comprises the following steps: film hanging and starting of the biological filter:
taking nitrate-containing wastewater as influent water, taking return sludge of a sewage plant as inoculated sludge, mixing the nitrate-containing wastewater with the inoculated sludge, inputting the mixture through a sewage inlet 21 of a pretreatment system, performing biofilm formation, and continuously operating until a layer of light brown biofilm is formed on the surface of a biological filter material, which indicates that the biofilm formation is successful;
step two: pretreatment of high nitrate industrial wastewater
The high-nitrate industrial wastewater to be treated passes through a biological filter, and the volume is 1m in the embodiment3The height of the filter material is 1m, the ascending flow velocity is 15m/h, the biological filter material is in a micro-expansion state, and the volume load of nitrate nitrogen is 1.0 kg-N/(m)3D), the retention time of the wastewater in the pretreatment system is 20min, the filling height of a water outlet pipe on the filter material layer 6 is 5cm, the average concentration of the nitrate nitrogen in the inlet water is 70.12mg/L, the average concentration of the total nitrogen is 81.56mg/L, the continuous operation is carried out for 30d, and the average concentration of the nitrate nitrogen in the outlet water is 3887mg/L, the average concentration of total nitrogen is 40.41mg/L, the nitrate nitrogen and the total nitrogen of effluent are both lower than 45mg/L, and the experimental results are shown in figures 3 and 4. The pyrite in the biological filter material is used as an electron donor of thiobacillus denitrificans to realize the denitrification of wastewater, the same water quality of inlet water is realized, if an organic carbon source (sodium acetate) is added, the theoretical adding amount is 4.93g according to the removal of 1g of nitrate nitrogen, the actual adding amount is generally 6.0g, and for the embodiment, the adding amount of sodium acetate is 13.5 kg.
Step three: back flushing
And after the pretreatment system continuously operates for 30 days, backwashing the biological filter material in the pretreatment system by using the backwashing system.
Example 3
This example provides another method for pre-treating high nitrate content industrial wastewater using the pre-treatment system of example 1, which comprises:
the method comprises the following steps: film hanging and starting of the biological filter:
taking nitrate-containing wastewater as influent water, taking return sludge of a sewage plant as inoculated sludge, mixing the nitrate-containing wastewater with the inoculated sludge, inputting the mixture through a sewage inlet 21 of a pretreatment system, performing biofilm formation, and continuously operating until a layer of light brown biofilm is formed on the surface of a biological filter material, which indicates that the biofilm formation is successful;
step two: pretreatment of high nitrate industrial wastewater
The high-nitrate industrial wastewater to be treated passes through a biological filter, the height of a filter material is 35cm, the ascending flow rate is 15m/h, the biological filter material is in a micro-expansion state, and the volume load of nitrate nitrogen is 1.0 kg-N/(m)3D), the retention time of the wastewater in the pretreatment system is 20min, the filling height of a water outlet pipe on a filter material layer 6 is 5cm, the average concentration of nitrate nitrogen in wastewater inlet water is 76.56mg/L, the average concentration of TN (total nitrogen) is 87.74mg/L, the wastewater continuously runs for 30d, a biological filter material is used for performing a wastewater treatment experiment, the average concentration of nitrate nitrogen in the wastewater outlet water is 41.44mg/L, the average concentration of TN (total nitrogen) is 43.76mg/L, and the experimental result is shown in figures 5 and 6. The pyrite in the biological filter material is used as an electron donor of the thiobacillus denitrificans to realize the denitrification of the wastewater, the same water quality of the inlet water is realized, and if an organic carbon source (sodium acetate) is added, 1g of nitrate nitrogen is removedThe theoretical amount of sodium acetate added is 4.93g, the actual amount of sodium acetate added is generally 6.0g, and for the embodiment, about 15kg of sodium acetate needs to be added.
Step three: back flushing
And after the pretreatment system continuously operates for 30 days, backwashing the biological filter material in the pretreatment system by using the backwashing system.
Example 4
The embodiment provides the denitrogenation effect comparison when different autotrophic denitrification biological filter materials handle, wherein, the biological filter material that obtains with embodiment 1 preparation is biological filter material A, sets up contrast test simultaneously, includes:
comparative example 1: replacing the sulfur-containing tailings activated by limestone with natural sulfur-containing tailings, and preparing a biological filter material B by using other raw materials and the same preparation method as in example 1;
comparative example 2: using cement to replace aluminum dihydrogen phosphate as an adhesive for granulation, and preparing a biological filter material C from other raw materials and a preparation method thereof as the biological filter material A;
the 3 kinds of biological filter materials A, B, C are filled in a biological filter column to carry out a sewage denitrification experiment, which comprises the following steps:
film forming: the secondary treatment water of a sewage treatment plant and the return sludge of the sewage treatment plant are used as inoculation sludge, upward inflow water is adopted, the ascending flow rate is 10m/h, the retention time of sewage in a filter column is 1h, the treated water is discharged from a water outlet at the upper end of the filter column, and the operation is continuously carried out until a layer of light brown biological membrane is formed on the surface of the biological filter material, which indicates that the membrane hanging is successful.
And (3) treatment: the average concentration of nitrate nitrogen in wastewater inlet water is 14.05mg/L, the average concentration of TN (total nitrogen) is 16.88mg/L, the wastewater is continuously operated for 30 days, three filter columns are respectively filled with the three biological filter materials, and a wastewater treatment comparison experiment is carried out, wherein the experiment results are shown in figures 7 and 8.
The average concentrations of nitrate nitrogen and TN in the effluent treated by the biological filter material A are respectively 2.48mg/L and 4.67mg/L, and the average removal rates are 82.23% and 74.81% respectively; the average concentration of effluent nitrate nitrogen and TN treated by the biological filter material B is 10.37mg/L and 13.02mg/L respectively, and the average removal rate is 25.87 percent and 22.98 percent respectively; the average concentration of nitrate nitrogen and TN in effluent treated by the biological filter material C is 4.69mg/L and 6.10mg/L respectively, and the average removal rate is 66.51% and 63.86% respectively.
The above examples show that: the nitrogen removal efficiency of the unactivated sulfur-containing tailings is lowest; the denitrification efficiency of the activated sulfur-containing tailings and the cement binder is inferior; the activated sulfur-containing tailings have the highest denitrification efficiency. The biological filter material A is prepared from the sulfur-containing tailings activated by limestone, the surface active point sites are increased after the sulfur-containing tailings are activated, the activated sulfur-containing tailings and sludge biochar are jointly used as microorganism carriers, the sludge biochar can stimulate microorganisms to generate more EPS, the microorganisms are promoted to adhere and grow on the surface of the biological filter material, the mass transfer coefficient of the microorganism and wastewater reaction is improved, and the denitrification efficiency is high. The biological filter material B has the lowest denitrification efficiency because the sulfur-containing tailings are not activated, the active sites on the surface of the tailings layer are few, the formation of a biological film on the surface of the filter material is difficult, and the number of microorganisms is few. Although the biological filter material C is prepared from the activated sulfur-containing tailings, cement is used as a binder, so that the surface area and the active site number of the biological filter material are reduced, and the denitrification efficiency after wastewater treatment is lower than that of the biological filter material A.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The utility model provides a high nitrate industrial waste water denitrogenation pretreatment systems which characterized in that, includes the barrel, wherein:
a filter plate is arranged in the cylinder body, a filter material layer is arranged above the filter plate, and the filter material layer is filled with autotrophic denitrification biological filter materials;
the bottom end of the barrel is provided with a sewage inlet, the upper end of the barrel is provided with a sewage outlet, the sewage inlet is connected with sewage to be treated through a sewage inlet pipeline, a peristaltic pump is arranged on the sewage inlet pipeline, and the sewage outlet is connected with a subsequent sewage biological denitrification system through a sewage outlet pipeline;
the bottom end of the cylinder body is also provided with a back-washing water outlet, the upper end of the cylinder body is also provided with a back-washing water inlet, and the back-washing water inlet and the back-washing water outlet are connected with an external back-washing device;
the upper end of the filter material layer is lower than the sewage outlet and the back flush water inlet;
the upper end of the cylinder body is also provided with an exhaust port.
2. The denitrification pretreatment system for industrial wastewater with high nitrate content according to claim 1, wherein the filter plate has an average pore size of 10 mm.
3. The high nitrate content industrial wastewater denitrification pretreatment system of claim 1, wherein the autotrophic denitrification biological filter material is prepared from sulfur-containing tailings, and the biological filter material comprises the following components: the preparation method of the sulfur-containing tailings, the limestone, the sludge biochar and the binder after the limestone activation treatment comprises the following steps:
(1) activation treatment of sulfur-containing tailings
Crushing the sulfur-containing tailings, adding limestone, uniformly mixing, and performing activation treatment in an inert atmosphere to obtain activated sulfur-containing tailings;
(2) preparation of sludge biochar
Drying the residual sludge in the sewage treatment process, adding zinc chloride for activation, and carrying out carbonization treatment in a nitrogen atmosphere to obtain sludge biochar;
(3) grinding the activated sulfur-containing tailings and the sludge biochar, mixing the ground activated sulfur-containing tailings and the sludge biochar with limestone, adding a binder for bonding, and preparing the biological filter material with uniform particle size.
4. The denitrification pretreatment system for the high-nitrate industrial wastewater as claimed in claim 1, wherein the height of the filter material layer is 1m, and the average particle size of the filter material is 30-40 mm.
5. The denitrification pretreatment system for the high-nitrate industrial wastewater as claimed in claim 1, wherein the pretreatment system further comprises a support and a clamp arranged on the support, and the cylinder is vertically fixed on the support through the clamp.
6. The denitrification pretreatment system for high nitrate content industrial wastewater according to claim 1, wherein the peristaltic pump is a peristaltic metering pump.
7. The denitrification pretreatment system for high nitrate content industrial wastewater according to claim 1, wherein the distance from the upper end of the filter material layer to the wastewater outlet is 5 cm.
8. A method for pretreating high nitrate industrial wastewater based on the denitrification pretreatment system for high nitrate industrial wastewater of any one of claims 1 to 7, which comprises the following steps:
the method comprises the following steps: film hanging and starting of the biological filter:
taking nitrate-containing wastewater as influent water, taking return sludge of a sewage plant as inoculated sludge, mixing the nitrate-containing wastewater with the inoculated sludge, inputting the mixture through a sewage water inlet to carry out biofilm formation, and continuously operating until a layer of light brown biofilm is formed on the surface of a biological filter material, thereby indicating that the biofilm formation is successful;
step two: pretreatment of high nitrate industrial wastewater
Inputting high-nitrate industrial wastewater to be treated into the cylinder body through a sewage inlet, controlling the rising flow rate of the wastewater, enabling the biological filter material to be in a micro-expansion state in the pretreatment system for autotrophic denitrification and denitrification so as to remove nitrate in the wastewater, and discharging the treated wastewater through a wastewater outlet pipe to finish pretreatment;
step three: back flushing
And after the pretreatment system operates for a certain time, the backwashing system is used for backwashing the biological filter material in the pretreatment system.
9. The method as claimed in claim 8, wherein in the second step, the rising flow rate of the wastewater is 10-15m/h, and the retention time of the wastewater in the biological filter material is 20-25 min.
10. Use of a high nitrate content industrial wastewater denitrification pretreatment system as defined in any one of claims 1 to 7 as a pretreatment apparatus for a biological denitrification treatment process of wastewater.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112573651A (en) * | 2020-11-23 | 2021-03-30 | 北京泰科智康环保科技有限公司 | Ecological energy-saving control system for autotrophic denitrification biological filter |
| CN112919732A (en) * | 2021-01-26 | 2021-06-08 | 中电环保股份有限公司 | UAD biological filter tower system based on sulfur autotrophy and denitrification method |
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