CN111285461A - System for realizing enhanced denitrification of deep bed denitrification filter and operation method - Google Patents
System for realizing enhanced denitrification of deep bed denitrification filter and operation method Download PDFInfo
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Abstract
A system for realizing enhanced nitrogen removal of a deep bed denitrification filter comprises the deep bed denitrification filter, an active coke adsorption tank and a clean water tank; the deep bed denitrification filter is divided into a pre-filtering area and a main filtering denitrification area, the outlet of the pre-filtering area is connected with the inlet of the main filtering denitrification area, the pre-filtering area is provided with a carbon source adding point, the inlet is provided with an online turbidity detector and a nitrate nitrogen detector, the main filtering denitrification area is provided with a carbon source adding point, the inlet and the outlet are respectively provided with an online COD detector, the water outlet is provided with an online nitrate nitrogen detector, and the water outlet of the active coke adsorption tank is provided with an online COD detector; the outlet of the deep bed denitrification filter tank is connected with the inlet of the active coke adsorption tank or directly connected with the inlet of the clean water tank, and the outlet of the active coke adsorption tank is connected with the inlet of the clean water tank. The system improves the utilization efficiency of the carbon source, improves the flexibility of the amount of the carbon source added in the denitrification unstable period and strengthens the denitrification effect of the deep bed filter.
Description
Technical Field
The invention belongs to the technical field of water treatment, and relates to a system for realizing enhanced denitrification of a deep bed denitrification filter and an operation method.
Background
With the continuous improvement of the demand of improving the water environment quality, the pollutant discharge standard of the urban sewage treatment plant in China is continuously improved. TN is one of the key factors of water eutrophication, and in the local standards published in China successively in Beijing, Tianjin, Zhejiang and Jiangsu, the TN has more strict requirements relative to the discharge standard of pollutants for municipal wastewater treatment plants (GB 18918-2002). Such as the comprehensive discharge standard of water pollutants in Beijing (DB11/307-2013) and the discharge standard of pollutants in urban sewage treatment plants in Tianjin (DB12/599-2015), aiming at the sewage discharged into the class II and class III water bodies and the catchment range thereof and the design scale of the sewage is more than or equal to 10000m3The effluent of the town sewage treatment plant of/d provides a discharge standard with TN lower than 10mg/L and requires COD lower than 20mg/L and 30mg/L respectively, and provides a high requirement for denitrification of the town sewage treatment plant.
The deep bed denitrification filter tank is used as an advanced treatment process which is produced according to the first grade A and meets the discharge standard of pollutants for municipal wastewater treatment plants (GB18918-2002), is applied to a precipitation treatment process, takes quartz sand as a filter material, and can synchronously denitrify while removing suspended matters, thereby being widely applied to the advanced treatment process of municipal wastewater treatment plants in China.
The operation practice of the deep-bed denitrification filter shows that when the effluent of the sedimentation tank, namely the concentration of suspended matters in the inlet water of the filter, has fluctuation impact, the backwashing process frequently started by the deep-bed filter causes the biomembrane growing on the surface of the quartz sand to be damaged, the denitrification effect is influenced, and the fallen biomembrane also easily causes the comprehensive standard exceeding of the effluent quality of the filter; and the COD of the effluent water is up to the standard, but sufficient carbon source cannot be added under the conditions that the total amount of the microbial biomass is low in the starting period and the microbial activity function is reduced in the low-temperature period in winter, so that the denitrification starting period is too long and the removal amount of TN (total nitrogen) is reduced in the low-temperature period.
Therefore, under the high TN standards of the effluent and the strict requirements of COD, a process and a method for realizing the denitrification of the enhanced deep bed denitrification filter and ensuring the COD of the effluent are necessary.
Disclosure of Invention
In order to solve the technical problems of the deep-bed sand filter with the denitrification function, the invention provides a system for realizing the denitrification of the deep-bed denitrification filter, which improves the utilization efficiency of carbon sources, improves the growth environment of denitrifying microorganisms, improves the flexibility of the amount of the carbon sources added in the unstable period of denitrification and strengthens the denitrification effect of the deep-bed filter.
The invention also aims to provide the method for realizing the system for strengthening the denitrification of the deep bed denitrification filter.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a system for realize reinforceing deep bed denitrification filtering pond denitrogenation which characterized in that: comprises a deep bed denitrification filter tank, an active coke adsorption tank and a clean water tank; the deep bed denitrification filter is divided into a pre-filtering area and a main filtering denitrification area, the outlet of the pre-filtering area is connected with the inlet of the main filtering denitrification area, the pre-filtering area is provided with a carbon source adding point, the inlet is provided with an online turbidity detector and a nitrate nitrogen detector, the main filtering denitrification area is provided with a carbon source adding point, the inlet and the outlet are respectively provided with an online COD detector, the water outlet is provided with an online nitrate nitrogen detector, and the water outlet of the active coke adsorption tank is provided with an online COD detector; the outlet of the deep bed denitrification filter tank is connected with the inlet of the active coke adsorption tank or directly connected with the inlet of the clean water tank, and the outlet of the active coke adsorption tank is connected with the inlet of the clean water tank.
The pre-filtering area and the main body of the main filtering denitrification area of the deep bed denitrification filter are separated by a water-permeable partition plate.
The empty bed volume ratio of the pre-filtering area and the main filtering denitrification area of the deep bed denitrification filter is 1: 4-1: 5.
Biological ceramsite is filled in a pre-filtering area of the deep bed denitrification filter, and the particle size of the biological ceramsite is 3-5 mm.
The deep bed denitrification filter is characterized in that a three-way valve is arranged on a main filtering denitrification area water outlet pipe of the deep bed denitrification filter, two branch water outlet pipes which are divided into are respectively connected with an active coke adsorption tank inlet and a clean water tank inlet, and switch valves are arranged on the two branch water outlet pipes.
The main filtration denitrification area of the deep bed denitrification filter takes quartz sand as a filter material, and the particle size is 1.5-3.5 mm.
The filtering speed of the active coke adsorption tank is 8-10 m/h, and the height of the active coke adsorption tank is 2.0-2.5 m.
The active coke filled in the active coke adsorption tank is coal granular active coke, the grain diameter is 4-10 mm, and the iodine value is more than or equal to 500 mg/g.
And independent water backwashing systems are respectively arranged between the clean water tank and the pre-filtering area of the deep bed denitrification filter, between the clean water tank and the main filtration denitrification area of the deep bed denitrification filter and between the clean water tank and the active coke adsorption tank.
And the pre-filtering area, the main filtering denitrification area and the active coke adsorption tank of the deep bed denitrification filter are respectively provided with an independent air washing system.
The operation method of the system for realizing the enhanced deep bed denitrification filter denitrification comprises the following steps:
a. the method comprises the following steps that water to be treated enters a pre-filtering area of a deep bed denitrification filter through a water inlet pipeline, passes through the pre-filtering area from top to bottom at a filtering speed of 5-8 m/h, is subjected to real-time detection of inlet water turbidity through an online turbidity detector, is added with a carbon source through a carbon source adding point, and is adjusted to be 0-20% according to the inlet water turbidity; when the inlet water turbidity is more than or equal to 8NTU, no carbon source is added in the region, and the effect of reducing the concentration of suspended matters entering the main filtration denitrification region is only exerted; when the inlet water turbidity is less than 8NTU, the suspended matter concentration of the area is reduced under the condition of adding a carbon source, and meanwhile, the microorganisms growing on the surface of the ceramsite also have denitrification effect;
b. b, enabling the effluent obtained in the step a to enter a deep bed filter main filtration denitrification area through a permeable partition wall, enabling the effluent to pass through the deep bed filter main filtration denitrification area from top to bottom at a filtration speed of 5-8 m/h, adding a carbon source through a carbon source adding point, enabling the carbon source adding proportion of the area to be 80-100%, denitrifying through the denitrification of microorganisms growing on the surfaces of quartz sand, and removing suspended matters through the interception adsorption of the quartz sand;
c. b, determining whether the active coke adsorption tank runs beyond the water outlet according to the COD concentration of the effluent, when the COD is higher than a target set value, closing a valve on a pipeline between the outlet of the deep bed denitrification filter tank and the inlet of the clean water tank, opening a valve on a pipeline between the outlet of the deep bed denitrification filter tank and the inlet of the active coke adsorption tank, enabling the effluent obtained in the step b to enter the active coke adsorption tank through the pipeline, and removing organic matters through the active coke adsorption tank from bottom to top at a filtering speed of 8-10 m/h to provide guarantee for the effluent reaching the COD during the initial denitrification function instability period of the denitrification start-up period and the low-temperature period;
when COD is lower than a target set value, a valve on a pipeline between the outlet of the deep bed denitrification filter and the inlet of the active coke adsorption tank is closed, a valve on a pipeline between the outlet of the deep bed denitrification filter and the inlet of the clean water tank is opened, and the active coke adsorption tank runs in an overrunning manner;
d. and c, the effluent obtained in the step c enters a clean water tank through an outlet and is discharged.
Compared with the prior art, the invention has the following advantages and positive effects:
1. the deep bed denitrification filter tank is divided into the pre-filtering area and the main filtering denitrification area, and the independent backwashing system is arranged, so that the backwashing frequency of the main filtering denitrification area can be reduced through the counteracting effect of the pre-filtering area on the concentration impact of the inflow suspended matters in the period of high concentration of the inflow suspended matters, the influence of frequent backwashing on the biomass on the surface of the quartz sand is avoided, and favorable conditions are provided for sufficient biomass for denitrification in the main filtering area of the filter tank.
2. The deep bed denitrification filter tank is divided into a pre-filtering area and a main filtering denitrification area, the two areas are both provided with carbon source feeding points, the feeding proportion of the carbon sources in the two areas can be flexibly adjusted according to the change of the turbidity of inlet water, the carbon sources are not fed when the environment of the pre-filtering area is not good, the consumption of the carbon sources is avoided, the denitrification effect can be exerted in both the pre-filtering area and the main filtering denitrification area of the filter tank when the concentration of suspended matters in the inlet water is low, the operation mode is flexible, and the optimal utilization of the additional carbon sources is realized.
3. The active coke adsorption tank is arranged behind the deep bed denitrification filter tank, whether the deep bed denitrification filter tank runs beyond the COD concentration of the effluent water of the deep bed denitrification filter tank can be determined according to the COD concentration of the effluent water of the deep bed denitrification filter tank, the effluent water COD can reach the standard by providing guarantee for the denitrification start period and the denitrification unstable function period at the initial stage of entering the low temperature period, the flexibility of the external carbon source amount of the deep bed denitrification filter tank is improved, and an elastic space is provided for the running of the deep bed denitrification filter tank.
4. The empty bed volume ratio of the pre-filtering area and the main filtering denitrification area of the deep bed denitrification filter is 1: 4-1: 5, when the deep bed denitrification filter is applied to the transformation of the deep bed filter, the height of the deep bed filter is generally 1.8-2.4 m, the ceramsite in the pre-filtering area can also play a role in filtering after the height of a filter column in the main filtering area is reduced, and the concentration of suspended matters in effluent can not be influenced except for the strengthening denitrification effect; in addition, the height of the biological ceramsite adopted in the pre-filtering area is only 0.4-0.5 m, the biological ceramsite can be supported by a water-permeable partition plate with a stainless steel framework, and a structural main body does not need to be changed during application.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
In the figure: 1-water to be treated; 2-deep bed denitrification filter; 2-1, a pre-filtering area of a deep bed denitrification filter; 2-2, a main filtration denitrification area of the deep bed denitrification filter; 3-an active coke adsorption tank; 4-a clean water tank; 5, discharging water; 6-adding a carbon source point in a pre-filtering area; 7-online turbidity detector; 8-online nitrate nitrogen detector; 9-online COD detector; 10-carbon source feeding point in the main filtering area; 11-on-line COD detector; 12-on-line nitrate nitrogen detector; 13-on-line COD detector; 14-pre-filtering zone water backwashing system; 15-water backwashing system of the main filtration denitrification zone; 16-active coke adsorption tank water backwashing system; 17-pre-filter area gas backwashing system; 18-a main filtration denitrification zone gas backwashing system; 19-active coke adsorption tank gas backwashing system.
Detailed Description
As shown in fig. 1: a system for realizing enhanced denitrification of a deep bed denitrification filter comprises a deep bed denitrification filter (2), an active coke adsorption tank (3) and a clean water tank (4).
The device is characterized in that the deep bed denitrification filter (2) is internally divided into a prefiltering area (2-1) and a main filtration denitrification area (2-2) by a water permeable partition plate, an outlet of the prefiltering area (2-1) is connected with an inlet of the main filtration denitrification area (2-2), the prefiltering area (2-1) is provided with a carbon source feeding point (6), the inlet is provided with an online turbidity detector (7) and a nitrate nitrogen detector (8), the main filtration denitrification area (2-2) is provided with a carbon source feeding point (10), the inlet and the outlet are respectively provided with an online COD detector (9) and an online COD detector (11), the water outlet is provided with an online nitrate nitrogen detector (12), and the water outlet of the active coke adsorption tank (3) is provided with an online COD detector (13); be provided with the three-way valve on the outlet pipe of the main denitrification district (2-2) of straining of deep bed denitrification filtering pond (2), two branch ways outlet pipes that fall into all are provided with switch valve on the outlet pipe with active coke adsorption tank (3) import and clean water basin (4) access connection respectively, and two branch ways outlet pipes, switch through switch valve and realize that deep bed denitrification filtering pond export links to each other two kinds of operation modes with active coke adsorption tank (3) access connection or deep bed denitrification filtering pond export is direct with the clean water basin import, the export of active coke adsorption tank (3) and the access connection of clean water basin (4).
The deep bed denitrification filter (2) is provided with a prefiltration area (2-1) and a main filtration denitrification area (2-2), and the volume ratio of empty beds in the two areas is 1: 4-1: 5.
And a pre-filtering area (2-1) of the deep bed denitrification filter (2) is filled with biological ceramsite, and the particle size is 3-5 mm.
The main filtration denitrification area (2-2) of the deep bed denitrification filter (2) takes quartz sand as a filter material, and the particle size is 1.5-3.5 mm.
The filtering speed of the active coke adsorption tank (3) is 8-10 m/h, and the height is 2.0-2.5 m.
The active coke filled in the active coke adsorption tank (3) is coal granular active coke, the grain diameter is 4-10 mm, and the iodine value is more than or equal to 500 mg/g.
An online turbidity detector arranged at the inlet of a pre-filtering area of the deep bed denitrification filter tank is used for guiding the distribution of the carbon source adding proportion between two carbon source adding points, and an online COD detector arranged at the outlet of a main filtering denitrification area of the deep bed denitrification filter tank is used for determining whether the activated coke adsorption tank runs beyond the operating range; an online nitrate nitrogen detector arranged at the inlet of the pre-filtering area, an online COD detector arranged at the inlet of the main filtering denitrification area and an online nitrate nitrogen detector at the outlet are used for assisting in determining the amount of the external carbon source and analyzing the denitrification effect of the filter.
And independent water backwashing systems (14), (15) and (16) are respectively arranged between the clean water tank and the pre-filtering area of the deep bed denitrification filter, between the clean water tank and the main filtering denitrification area of the deep bed denitrification filter and between the clean water tank and the active coke adsorption tank.
The pre-filtering area, the main filtering denitrification area and the active coke adsorption tank of the deep bed denitrification filter are respectively provided with an independent air washing system (17), (18) and (19).
According to the invention, carbon source adding points are arranged in a pre-filtering area and a main filtering denitrification area of the deep bed denitrification filter, the carbon source adding proportion of the two points is flexibly adjusted according to the inlet water turbidity, the carbon source adding proportion of the pre-filtering area is 0-20%, the carbon source adding proportion of the main filtering denitrification area is 80-100%, when the inlet water turbidity is more than or equal to 8NTU, no carbon source is added in the pre-filtering area, and all carbon sources are added in the denitrification main filtering area.
And further, determining whether the active coke adsorption tank runs beyond the target value according to the COD concentration in the effluent of the deep bed denitrification filter, when the COD is higher than the target value, enabling the effluent of the deep bed denitrification filter to enter the active coke adsorption tank, and after adsorption, enabling the effluent of the deep bed denitrification filter to directly enter the clean water tank, and when the COD is lower than the target value, enabling the active coke adsorption tank to run beyond the target value.
When COD is lower than a target set value, a valve on a pipeline between an outlet of a main filtration denitrification area of the deep bed denitrification filter and an inlet of the active coke adsorption tank is closed, a valve on a pipeline between the outlet of the deep bed denitrification filter and the inlet of the clean water tank is opened, and the active coke adsorption tank runs in an overrunning manner.
The operation method of the system for realizing the denitrification of the enhanced deep bed denitrification filter comprises the following steps:
embodiment 1:
a. the method comprises the following steps that water (1) to be treated enters a pre-filtering area (2-1) of a deep bed denitrification filter through a water inlet pipeline, passes through the pre-filtering area from top to bottom at a filtering speed of 5-8 m/h, is subjected to real-time turbidity monitoring through an online turbidity detector (7), and is added with a carbon source through a carbon source adding point (6) when the turbidity of inlet water is lower than 2NTU, wherein the adding proportion of the carbon source in the area is controlled to be 20%, the concentration of suspended matters entering a main filtering denitrification area is reduced, and microorganisms growing on the surface of ceramsite utilize an external carbon source to perform denitrification reaction;
b. the effluent obtained in the step a enters a main filtration denitrification area (2-2) of the deep bed filter through a permeable partition wall, passes through the deep bed filter from top to bottom at a filtration speed of 5-8 m/h, and is subjected to real-time monitoring of COD concentration and carbon source addition at a carbon source addition point (10) by an online COD detector (9), and the carbon source addition proportion of the area is controlled to be 80%; denitrifying by the denitrification of microorganisms growing on the surface of the quartz sand, and removing suspended matters by the interception and adsorption among the quartz sand;
c. monitoring COD of the effluent obtained in the step b in real time by an online COD monitor (11), when the COD of the effluent is higher than a target value, opening a valve on a pipeline between an outlet of the deep bed denitrification filter and an inlet of the active coke adsorption tank, closing the valve on the pipeline between the outlet of the deep bed denitrification filter and the inlet of the clean water tank, and allowing the effluent obtained in the step b to enter the active coke adsorption tank through the pipeline, so that organic matters are removed from bottom to top through the active coke adsorption tank at a filtering speed of 8-10 m/h;
d. c, the effluent obtained in the step c enters a clean water tank through an outlet and is discharged;
wherein the adding amount of COD is comprehensively determined according to the detection results of an online nitrate nitrogen detector arranged at the inlet of the pre-filtering area, an online COD detector arranged at the inlet of the main filtering denitrification area and an online nitrate nitrogen detector arranged at the outlet;
further, the air-water back flushing of the pre-filtering area, the main filtering and denitrifying area and the active coke adsorption tank of the deep bed denitrification filter tank is respectively executed according to the pressure difference change in each tank body, and the back flushing drainage of the main filtering and denitrifying area can be discharged through the drainage outlets of the main filtering and denitrifying area and the pre-filtering area.
Embodiment 2:
a. the method comprises the following steps that water (1) to be treated enters a pre-filtering area (2-1) of a deep bed denitrification filter through a water inlet pipeline and passes through the pre-filtering area from top to bottom at a filtering speed of 5-8 m/h, a water inlet online turbidity detector (7) monitors turbidity in real time, when the turbidity of inlet water is 2-4 NTU, a carbon source is added through a carbon source adding point (6), the carbon source adding proportion of the area is controlled to be 10%, the concentration of suspended matters entering a main filter denitrification area is reduced, and meanwhile microorganisms growing on the surface of a filler utilize an external carbon source to carry out denitrification reaction;
b. the effluent obtained in the step a enters a main filtration denitrification area (2-2) of the deep bed filter through a permeable partition wall, passes through the deep bed filter from top to bottom at a filtration speed of 5-8 m/h, and is subjected to real-time monitoring of COD concentration and carbon source addition at a carbon source addition point (10) by an online COD detector (9), and the carbon source addition proportion of the area is controlled to be 90%; denitrifying by the denitrification of microorganisms growing on the surface of the quartz sand, and removing suspended matters by the interception and adsorption among the quartz sand;
c. monitoring COD of the effluent obtained in the step b in real time by an online COD monitor (11), when the COD of the effluent is lower than a target value, opening a valve on a pipeline between the outlet of the deep bed denitrification filter and the inlet of the clean water tank, closing the valve on the pipeline between the outlet of the deep bed denitrification filter and the inlet of the active coke adsorption tank, and directly feeding the effluent obtained in the step b into the clean water tank through the pipeline and then discharging the effluent;
wherein the adding amount of COD is comprehensively determined according to the detection results of an online nitrate nitrogen detector arranged at the inlet of the pre-filtering area, an online COD detector arranged at the inlet of the main filtering denitrification area and an online nitrate nitrogen detector at the outlet;
further, the air-water back flushing of the pre-filtering area, the main filtering and denitrifying area and the active coke adsorption tank of the deep bed denitrification filter tank is respectively executed according to the pressure difference change in each tank body, and the back flushing drainage of the main filtering and denitrifying area can be discharged through the drainage outlets of the main filtering and denitrifying area and the pre-filtering area.
Embodiment 3:
a. the method comprises the following steps that water (1) to be treated enters a pre-filtering area (2-1) of a deep bed denitrification filter through a water inlet pipeline and passes through the pre-filtering area from top to bottom at a filtering speed of 5-8 m/h, a water inlet online turbidity detector (7) monitors turbidity in real time, when the turbidity of inlet water is 4-8 NTU, a carbon source is added through a carbon source adding point (6), the carbon source adding proportion of the area is controlled to be 5%, the concentration of suspended matters entering a main filter denitrification area is reduced, and microorganisms growing on the surface of filler utilize an external carbon source to carry out denitrification reaction;
b. the effluent obtained in the step a enters a main filtration denitrification area (2-2) of the deep bed filter through a permeable partition wall, passes through the deep bed filter from top to bottom at a filtration speed of 5-8 m/h, and is subjected to real-time monitoring of COD concentration and carbon source addition at a carbon source addition point (10) by an online COD detector (9), and the carbon source addition proportion of the area is controlled to be 95%; denitrifying by the denitrification of microorganisms growing on the surface of the quartz sand, and removing suspended matters by the interception and adsorption among the quartz sand;
c. monitoring COD of the effluent obtained in the step b in real time by an online COD monitor (11), when the COD of the effluent is higher than a target value, opening a valve on a pipeline between an outlet of the deep bed denitrification filter and an inlet of the active coke adsorption tank, closing the valve on the pipeline between the outlet of the deep bed denitrification filter and the inlet of the clean water tank, and allowing the effluent obtained in the step b to enter the active coke adsorption tank through the pipeline, so that organic matters are removed from bottom to top through the active coke adsorption tank at a filtering speed of 8-10 m/h;
d. c, the effluent obtained in the step c enters a clean water tank through an outlet and is discharged;
wherein the adding amount of COD is comprehensively determined according to the detection results of an online nitrate nitrogen detector arranged at the inlet of the pre-filtering area, an online COD detector arranged at the inlet of the main filtering denitrification area and an online nitrate nitrogen detector at the outlet;
further, the air-water back flushing of the pre-filtering area, the main filtering and denitrifying area and the active coke adsorption tank of the deep bed denitrification filter tank is respectively executed according to the pressure difference change in each tank body, and the back flushing drainage of the main filtering and denitrifying area can be discharged through the drainage outlets of the main filtering and denitrifying area and the pre-filtering area.
Embodiment 4:
a. the method comprises the following steps that water (1) to be treated enters a pre-filtering area (2-1) of a deep bed denitrification filter through a water inlet pipeline and passes through the pre-filtering area from top to bottom at a filtering speed of 5-8 m/h, a water inlet online turbidity detector (7) monitors turbidity in real time, and when the turbidity of the water inlet is higher than 8NTU, a carbon source is not added in the area, and the effect of reducing the concentration of suspended matters entering a main filtering denitrification area is achieved;
b. the effluent obtained in the step a enters a deep bed filter main filtration denitrification area (2-2) through a permeable partition wall, passes through the deep bed filter main filtration denitrification area from top to bottom at a filtration speed of 5-8 m/h, is monitored in real time by an online COD detector (9), is added with a carbon source at a carbon source adding point (10), is controlled to be 100% in the carbon source adding proportion, is mainly denitrified by the denitrification of microorganisms growing on the surface of quartz sand in the area, and is removed of suspended matters through the interception adsorption effect among the quartz sand;
c. monitoring COD of the effluent obtained in the step b in real time by an online COD monitor (11), when the COD of the effluent is lower than a target value, opening a valve on a pipeline between the outlet of the deep bed denitrification filter and the inlet of the clean water tank, closing the valve on the pipeline between the outlet of the deep bed denitrification filter and the inlet of the active coke adsorption tank, and directly feeding the effluent obtained in the step b into the clean water tank through the pipeline and then discharging the effluent;
wherein the adding amount of COD is comprehensively determined according to the detection results of an online nitrate nitrogen detector arranged at the inlet of the pre-filtering area, an online COD detector arranged at the inlet of the main filtering denitrification area and an online nitrate nitrogen detector at the outlet;
further, the air-water back flushing of the pre-filtering area, the main filtering and denitrifying area and the active coke adsorption tank of the deep bed denitrification filter tank is respectively executed according to the pressure difference change in each tank body, and the back flushing drainage of the main filtering and denitrifying area can be discharged through the drainage outlets of the main filtering and denitrifying area and the pre-filtering area.
The invention adopts the technical scheme that a prefiltering area is arranged at the upper part of a deep bed denitrification filter tank, the deep bed denitrification filter tank is divided into a prefiltering area and a main filtration denitrification area, and the influence on the denitrification of the filter tank when the concentration of suspended matters in inlet water fluctuates is reduced; carbon source feeding points are arranged in the pre-filtering area and the main filtering denitrification area, and the distribution proportion of the carbon sources in the pre-filtering area and the main filtering denitrification area is adjusted according to the turbidity condition of inlet water, so that the high-efficiency utilization of the external carbon source is guaranteed; in addition, the activated coke adsorption tank is used as a supplement unit, so that the problem of over standard of COD (chemical oxygen demand) of system effluent caused by an external carbon source in the unstable denitrification period is avoided, the flexibility of the amount of the external carbon source in the deep bed denitrification filter is improved, and the denitrification effect of the deep bed filter is enhanced.
The above embodiments are preferred embodiments of the present invention, and are not intended to be limiting embodiments of the present invention, and modifications and equivalent variations made by those skilled in the art based on the spirit of the present invention are within the technical scope of the present invention.
Claims (10)
1. The utility model provides a system for realize reinforceing deep bed denitrification filtering pond denitrogenation which characterized in that: comprises a deep bed denitrification filter tank, an active coke adsorption tank and a clean water tank; the deep bed denitrification filter is divided into a pre-filtering area and a main filtering denitrification area, the outlet of the pre-filtering area is connected with the inlet of the main filtering denitrification area, the pre-filtering area is provided with a carbon source adding point, the inlet is provided with an online turbidity detector and a nitrate nitrogen detector, the main filtering denitrification area is provided with a carbon source adding point, the inlet and the outlet are respectively provided with an online COD detector, the water outlet is provided with an online nitrate nitrogen detector, and the water outlet of the active coke adsorption tank is provided with an online COD detector; the outlet of the deep bed denitrification filter tank is connected with the inlet of the active coke adsorption tank or directly connected with the inlet of the clean water tank, and the outlet of the active coke adsorption tank is connected with the inlet of the clean water tank.
2. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: the empty bed volume ratio of the pre-filtering area and the main filtering denitrification area of the deep bed denitrification filter is 1: 4-1: 5.
3. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: biological ceramsite is filled in a pre-filtering area of the deep bed denitrification filter, and the particle size of the biological ceramsite is 3-5 mm.
4. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: the deep bed denitrification filter is characterized in that a three-way valve is arranged on a main filtering denitrification area water outlet pipe of the deep bed denitrification filter, two branch water outlet pipes which are divided into are respectively connected with an active coke adsorption tank inlet and a clean water tank inlet, and switch valves are arranged on the two branch water outlet pipes.
5. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: the main filtration denitrification area of the deep bed denitrification filter takes quartz sand as a filter material, and the particle size is 1.5-3.5 mm.
6. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: the filtering speed of the active coke adsorption tank is 8-10 m/h, and the height of the active coke adsorption tank is 2.0-2.5 m.
7. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: the active coke filled in the active coke adsorption tank is coal granular active coke, the grain diameter is 4-10 mm, and the iodine value is more than or equal to 500 mg/g.
8. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: and independent water backwashing systems are respectively arranged between the clean water tank and the pre-filtering area of the deep bed denitrification filter, between the clean water tank and the main filtration denitrification area of the deep bed denitrification filter and between the clean water tank and the active coke adsorption tank.
9. The system for realizing the enhanced denitrification of the deep bed denitrification filter according to claim 1, is characterized in that: and the pre-filtering area, the main filtering denitrification area and the active coke adsorption tank of the deep bed denitrification filter are respectively provided with an independent air washing system.
10. A method for implementing the system for enhancing the denitrification of the deep bed denitrification filter according to the claims 1-9, which is characterized in that: the method comprises the following steps:
a. the method comprises the following steps that water to be treated enters a pre-filtering area of a deep bed denitrification filter through a water inlet pipeline, passes through the pre-filtering area from top to bottom at a filtering speed of 5-8 m/h, is subjected to real-time detection of inlet water turbidity through an online turbidity detector, is added with a carbon source through a carbon source adding point, and is adjusted to be 0-20% according to the inlet water turbidity; when the inlet water turbidity is more than or equal to 8NTU, no carbon source is added in the region, and the effect of reducing the concentration of suspended matters entering the main filtration denitrification region is only exerted; when the inlet water turbidity is less than 8NTU, the suspended matter concentration of the area is reduced under the condition of adding a carbon source, and meanwhile, the microorganisms growing on the surface of the ceramsite also have denitrification effect;
b. b, enabling the effluent obtained in the step a to enter a deep bed filter main filtration denitrification area through a permeable partition wall, enabling the effluent to pass through the deep bed filter main filtration denitrification area from top to bottom at a filtration speed of 5-8 m/h, adding a carbon source through a carbon source adding point, enabling the carbon source adding proportion of the area to be 80-100%, denitrifying through the denitrification of microorganisms growing on the surfaces of quartz sand, and removing suspended matters through the interception adsorption of the quartz sand;
c. b, determining whether the active coke adsorption tank runs beyond the water outlet according to the COD concentration of the effluent, when the COD is higher than a target set value, closing a valve on a pipeline between the outlet of the deep bed denitrification filter tank and the inlet of the clean water tank, opening a valve on a pipeline between the outlet of the deep bed denitrification filter tank and the inlet of the active coke adsorption tank, enabling the effluent obtained in the step b to enter the active coke adsorption tank through the pipeline, and removing organic matters through the active coke adsorption tank from bottom to top at a filtering speed of 8-10 m/h to provide guarantee for the effluent reaching the COD during the initial denitrification function instability period of the denitrification start-up period and the low-temperature period;
when COD is lower than a target set value, a valve on a pipeline between the outlet of the deep bed denitrification filter and the inlet of the active coke adsorption tank is closed, a valve on a pipeline between the outlet of the deep bed denitrification filter and the inlet of the clean water tank is opened, and the active coke adsorption tank runs in an overrunning manner;
d. and c, the effluent obtained in the step c enters a clean water tank through an outlet and is discharged.
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| CN114275888A (en) * | 2021-12-29 | 2022-04-05 | 深圳市环水投资集团有限公司 | Denitrification deep bed filter |
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| CN114275888A (en) * | 2021-12-29 | 2022-04-05 | 深圳市环水投资集团有限公司 | Denitrification deep bed filter |
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