CN112225397A - Sewage treatment system and method based on double-sludge denitrification dephosphorization and biological filter tower - Google Patents
Sewage treatment system and method based on double-sludge denitrification dephosphorization and biological filter tower 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2813—Anaerobic digestion processes using anaerobic contact 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/105—Phosphorus compounds
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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
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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
- C02F2101/30—Organic compounds
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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Abstract
The invention provides a sewage treatment system based on double-sludge denitrification dephosphorization and biological filter towers, which comprises an anaerobic tank, a pre-anoxic tank, an anoxic tank, a sedimentation tank, an intermediate tank, a biological filter tower reaction tank and a water outlet tank. The invention also provides a sewage treatment method, wherein sewage is subjected to denitrification dephosphorization reaction through anaerobic treatment, pre-anoxic treatment, anoxic treatment and precipitation, water inflow is separated through precipitation, supernate enters a filter tower, synchronous nitrification and denitrification reaction is carried out under the condition of providing oxygen to carry out deep removal of total nitrogen, and meanwhile, refractory organic matters are decomposed and converted to be removed. The problems of denitrification and dephosphorization and simultaneous COD removal in the advanced municipal sewage treatment under the condition of low carbon-nitrogen ratio are solved; anaerobic and anoxic reflux is increased, the denitrification and dephosphorization effects are enhanced, an acceptor is provided for denitrification and dephosphorization, the removal of easily degradable organic matters is realized, the refractory organic matters are deeply degraded by the filter tower, and the blending is reasonable; the multiple couplings meet the high standard water outlet requirement under the condition of low C/N, and have the characteristics of energy conservation and land occupation saving.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment system and method based on double-sludge denitrification dephosphorization and a biological filter tower.
Background
The lack of water resources and serious pollution in China promote the continuous enhancement of environmental control, and the high-quality water treatment of municipal sewage is a way for realizing sewage recycling and water reclamation. And the high standard treatment of sewage means the increase of the cost of the traditional sewage treatment process: for example, sufficient carbon sources need to be added for nitrogen and phosphorus removal, chemical phosphorus removal facilities, medicaments and management operating cost need to be added for phosphorus removal, and the subsequent treatment cost of phosphorus-containing sludge needs to be increased for phosphorus removal, and deep COD removal processes need to be added for the removal of nondegradable COD, such as advanced oxidation or other deep organic matter removal technologies, so that the contradiction between the pursuit of sewage resource and water environment quality and the difficulty in meeting the requirements of traditional sewage treatment is continuously intensified, the optimization and upgrading of the traditional process are forced to be carried out, and the promotion of the traditional sewage process and technology is an effective means for realizing high-quality water, and is an approach for realizing the quality improvement and the efficiency enhancement of sewage, saving.
Disclosure of Invention
In view of the above, the invention provides a sewage treatment system and method based on double-sludge denitrification dephosphorization and biological filter tower, which solves the problems of complex process flow and high cost of the traditional municipal sewage treatment process and meets the high-standard water outlet requirement.
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The invention adopts the following technical scheme:
in some optional embodiments, a sewage treatment system based on double-sludge denitrification dephosphorization and biological filter tower is provided, which comprises an anaerobic tank, a pre-anoxic tank, an anoxic tank, a sedimentation tank, a biological filter tower reaction tank and a water outlet tank which are connected in sequence;
the anaerobic tank is connected with the sedimentation tank through a first sludge reflux pump, and the denitrifying phosphorus removal sludge in the sedimentation tank flows back to the anaerobic tank through the first sludge reflux pump to be mixed with sewage and to be subjected to phosphorus release under the action of denitrifying phosphorus removal bacteria;
the sedimentation tank is connected with the biological filter tower reaction tank through a lifting pump, and supernatant in the sedimentation tank enters the biological filter tower reaction tank through the lifting pump;
the water outlet tank is connected with the pre-anoxic tank through a second sludge reflux pump, and nitrate discharged by the biological filter tower reaction tank flows back to the pre-anoxic tank through the second sludge reflux pump to provide a receptor for denitrifying phosphorus removal.
In some optional embodiments, the sewage treatment system based on dual-sludge denitrification dephosphorization and biological filter tower further comprises: the middle tank is arranged between the sedimentation tank and the biological filter tower reaction tank, the middle tank is connected with the biological filter tower reaction tank through the lifting pump, supernatant in the sedimentation tank automatically flows into the middle tank, and the supernatant enters the biological filter tower reaction tank through the lifting pump.
In some optional embodiments, the sewage treatment system based on dual-sludge denitrification dephosphorization and biological filter tower further comprises: and the water outlet tank is connected with the biological filter tower reaction tank through the internal circulating pump.
In some optional embodiments, an ORP meter and a stirrer are arranged in each of the anaerobic tank, the pre-anoxic tank and the anoxic tank.
In some optional embodiments, a carbon source adding device is arranged in the anoxic tank.
In some optional embodiments, the sedimentation tank and the biological filter tower reaction tank are provided with a sludge discharge pipe.
In some optional embodiments, a first valve for adjusting the sludge reflux amount of the sedimentation tank is arranged on a pipeline connecting the anaerobic tank and the sedimentation tank, a second valve for adjusting the nitrate reflux amount is arranged on a pipeline connecting the water outlet tank and the pre-anoxic tank, and a third valve for adjusting the circulation amount of the filter tower is arranged on a pipeline connecting the water outlet tank and the biological filter tower reaction tank.
In some optional embodiments, the present invention further provides a sewage treatment method based on dual sludge denitrification dephosphorization and biological filter tower, comprising the following steps:
discharging the sewage into an anaerobic tank, mixing the sewage with denitrifying phosphorus removal sludge which flows back from a sedimentation tank, performing phosphorus release by using an organic carbon source in the sewage under the action of denitrifying phosphorus removal bacteria, and simultaneously converting an external carbon source into an internal carbon source by using thalli;
the mixed solution after phosphorus release enters a pre-anoxic tank, nitrate discharged from a reaction tank of the biological filter tower is used as a nitrification supernatant acceptor, the denitrification phosphorus removal bacteria decompose an internal carbon source to provide energy, excessive phosphate is absorbed, the nitrate is converted into nitrogen, and the rest organic matters are subjected to denitrification;
the mixed liquid in the pre-anoxic tank enters an anoxic tank for denitrification;
the mixed liquid in the anoxic tank enters the sedimentation tank for mud-water separation, one part of denitrification dephosphorization sludge flows back to the anaerobic tank, and the other part of sludge is discharged;
and enabling the supernatant in the sedimentation tank to flow to the biological filter tower reaction tank, circularly degrading ammonia nitrogen into nitrate nitrogen, and decomposing and converting refractory organic matters into a denitrification carbon source under the action of a biological membrane.
In some optional embodiments, the ORP of the anaerobic tank is-200 mv to-400 mv, and the retention time is 1-3 h; the ORP of the pre-anoxic tank is-50 mv to-200 mv, and the retention time is 1-2 h; the ORP of the anoxic tank is-100 mv to-300 mv, and the retention time is 2-4 h; the sludge concentration of the anaerobic tank, the pre-anoxic tank and the anoxic tank is 3500-4500 mg/L.
In some optional embodiments, the sewage treatment method based on dual-sludge denitrification dephosphorization and biological filter tower further comprises:
adjusting the sludge reflux amount of the sedimentation tank, and controlling the denitrification dephosphorization sludge reflux amount to be 50-100%;
adjusting the nitrate reflux amount of the biological filter tower reaction tank, and controlling the denitrification dephosphorization sludge reflux amount to be 200-300%;
adjusting the circulation quantity of the biological filter tower reaction tank, wherein the circulation quantity of a circulating water pump is 20-30 times of that of inlet water;
supplementing a carbon source to the anoxic pond, wherein the adding amount of C/N is 5/1-2/1;
and controlling the sludge age of the sedimentation tank to be 10-20 d.
The invention has the following beneficial effects:
1. the method comprises the steps of firstly optimizing a double-sludge system, arranging a sedimentation tank, increasing anaerobic and anoxic backflow, easily converting common denitrification and dephosphorization bacteria into denitrification and dephosphorization bacteria, arranging pre-anoxic and anoxic for denitrification and dephosphorization and common denitrification to coexist, promoting denitrification, realizing one-carbon dual-purpose, saving carbon source and aeration amount, reducing the yield of residual sludge, and strengthening double functions of dephosphorization and denitrification;
2. the double-sludge denitrification dephosphorization process and the filter tower process are coupled, the easily degradable organic matters are removed, the difficultly degradable organic matters are removed by the filter tower process, the COD is removed, the reasonable decomposition arrangement is realized, the deep removal of the COD is realized, the competition of the heterotypic bacteria on DO is inhibited, the nitrification capability of the nitrifying bacteria is enhanced, and the conditions are created for denitrification dephosphorization;
3. realizing multi-stage denitrification and dephosphorization and COD degradation and realizing high-standard water outlet;
4, the main removing process of TP only depends on a biochemical method, thereby avoiding the subsequent complicated chemical dephosphorization procedure;
5. the double-sludge denitrification dephosphorization process is coupled with the filter tower process, so that the superposition effect is outstanding, the energy is saved, and the water outlet effect is better;
6. the biochemical sludge does not contain chemical phosphorus removal agents, and is beneficial to subsequent sludge recycling and cyclic utilization.
Drawings
FIG. 1 is a schematic diagram of a sewage treatment system based on double-sludge denitrification dephosphorization and biological filter tower.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
As shown in fig. 1, in some illustrative embodiments, a sewage treatment system based on a double-sludge denitrification dephosphorization and biological filter tower is provided, which is used for realizing high-quality effluent, deep denitrification dephosphorization and COD removal for a municipal sewage advanced treatment system with a low C/N ratio, and comprises an anaerobic tank 1, a pre-anoxic tank 2, an anoxic tank 3, a sedimentation tank 4, an intermediate tank 5, a biological filter tower reaction tank 6 and an effluent tank 7 which are connected in sequence.
Firstly, sewage is subjected to denitrification dephosphorization reaction through an anaerobic tank 1, a pre-anoxic tank 2, an anoxic tank 3 and a sedimentation tank 4 to remove TN and TP, water inflow is separated through the sedimentation tank 4, and the anaerobic tank 1, the pre-anoxic tank 2, the anoxic tank 3 and the sedimentation tank 4 form a denitrification dephosphorization system. The supernatant containing ammonia nitrogen and refractory organic matters enters a biological filter tower reaction tank 6, synchronous nitrification and denitrification reaction is carried out under the condition that an internal circulating pump 71 provides oxygen to carry out deep removal of total nitrogen, and meanwhile, the refractory organic matters are decomposed and converted to be removed.
According to the invention, multi-stage nitrogen and phosphorus removal and COD removal are integrated into the system, so that the problems of nitrogen and phosphorus removal and COD removal in advanced treatment of municipal sewage under the condition of low carbon-nitrogen ratio can be solved, anaerobic-anoxic reflux is increased, a denitrification and phosphorus removal system is constructed, and the nitrogen and phosphorus removal effect is enhanced. The high-standard water outlet requirement under the condition of low C/N is realized, and the device has the characteristics of energy conservation, land occupation saving and high-standard water outlet.
The anaerobic tank 1 is connected with the sedimentation tank 4 through a first sludge reflux pump 42, the intermediate tank 5 is connected with the biological filter tower reaction tank 6 through a lift pump 51, the water outlet tank 7 is connected with the pre-anoxic tank 2 through a second sludge reflux pump 72, and the water outlet tank 7 is connected with the biological filter tower reaction tank 7 through an internal circulation pump 71.
An ORP instrument 8 and a stirrer 9 are arranged in the anaerobic tank 1, the pre-anoxic tank 2 and the anoxic tank 3. The ORP of the anaerobic tank 1 is-200 to-400 mv, and the retention time is 1 to 3 hours; the ORP of the pre-anoxic tank 2 is-50 mv to-200 mv, and the retention time is 1 h to 2 h; the ORP of the anoxic tank 3 is-100 to-300 mv, and the retention time is 2 to 4 hours; the sludge concentration of the anaerobic tank 1, the pre-anoxic tank 2 and the anoxic tank 3 is 3500-4500 mg/L.
A carbon source adding device 31 is arranged in the anoxic tank 3. The carbon source adding device 31 may be an existing material adding device, and the specific structure is not described herein. The addition amount is 5/1-2/1 in terms of C/N.
The sedimentation tank 4 and the biological filter tower reaction tank 6 are provided with a sludge discharge pipe 10. The sludge age of the sedimentation tank 4 is 10-20 days.
A first valve 11 for adjusting the sludge reflux amount of the sedimentation tank is arranged on a pipeline connecting the anaerobic tank 1 and the sedimentation tank 4, and the sludge reflux amount of denitrification dephosphorization is controlled to be 50-100%.
A second valve 12 for adjusting the reflux amount of the nitrate is arranged on a pipeline connecting the water outlet tank 7 and the pre-anoxic tank 2, and the reflux amount of the denitrification dephosphorization sludge is controlled to be 200-300%.
And a third valve 13 for adjusting the circulation volume of the filtering tower is arranged on a pipeline connecting the water outlet tank 7 and the biological filtering tower reaction tank 6, and the circulation volume of the internal circulation pump 71 is 20-30 times of that of inlet water.
The sewage treatment system based on double-sludge denitrification dephosphorization and biological filter tower has the following working process:
firstly, mixing sewage with denitrifying phosphorus removal sludge which flows back from a sedimentation tank 4 in an anaerobic tank 1, utilizing an organic carbon source in the sewage to release phosphorus under the action of denitrifying phosphorus removal bacteria, and simultaneously converting an external carbon source into an internal carbon source by thalli;
then the mixed liquid after phosphorus release automatically flows into the pre-anoxic tank 2, the second sludge reflux pump 72 provides a nitrification supernatant acceptor, namely nitrate, and simultaneously the denitrification phosphorus removal bacteria decompose the internal carbon source to provide energy for excessive phosphate absorption and convert the nitrate into nitrogen, and the residual organic matters are subjected to common denitrification;
the mixed liquid in the pre-anoxic tank 2 automatically flows into the anoxic tank 3 to continue the reaction, and simultaneously, a carbon source is properly supplemented by a carbon source adding device 31 according to the requirement of removing TN to carry out denitrification and denitrification;
then the mixed liquid is subjected to mud-water separation in the sedimentation tank 4, part of sludge enters the anaerobic tank 1 through the first sludge return pump 42, and TP is discharged through the sludge discharge pipe 10;
the supernatant of the sedimentation tank 4 automatically flows into the intermediate tank 5, the supernatant enters the biological filter tower reaction tank 6 through the lift pump 51, the supernatant contains ammonia nitrogen and refractory organic matters, air is brought into the system through the circulating pump 71, under the action of repeated circulating operation degradation, the biological filter tower reaction tank 6 degrades the ammonia nitrogen into nitrate nitrogen under the action of oxygen, and meanwhile, the refractory organic matters are decomposed and converted into an available denitrification carbon source under the action of a high-concentration biomembrane, and deep denitrification is carried out, namely part of the carbon source is used for deep denitrification;
and the oxygen-containing mixed liquor is subjected to phosphorus accumulation on the surface of the biological membrane, TP is discharged through a sludge discharge pipe 10 at the bottom of the biological filter tower reaction tank 6, and the supernatant is discharged through a water outlet tank 7.
The denitrifying phosphorus removal utilizes denitrifying phosphorus removal bacteria to realize synchronous nitrogen and phosphorus removal, and compared with the traditional denitrifying bacteria and phosphorus removal bacteria, the denitrifying phosphorus removal bacteria can simultaneously remove two pollutants, so that the invention can realize one carbon dual purpose of a carbon source: the carbon source is saved by more than 50 percent, the oxygen is saved by about 30 percent, and the sludge yield is reduced by more than 50 percent. And the phosphorus removal effect is obvious, the method is a means for realizing deep nitrogen and phosphorus removal, the double-sludge denitrification phosphorus removal system is more stable in operation compared with a single-sludge denitrification system, and the parameters are easier to control.
The biological filter tower adopted by the biological filter tower reaction tank 6 of the invention is a novel biological membrane water treatment technology and mainly aims at improving the quality of sewage waterAnd the concentration of organic pollutants and nutrient elements in the wastewater is reduced. The core technology of the filter tower is a nano ceramic carrier. The ceramic carrier has very high specific surface area, provides a suitable environment for the growth of microorganisms, and obviously improves the thickness of the biofilm in unit space. Generally, the biomass in the biological filter tower can reach 150kg/m3Is far higher than that of the conventional activated sludge system by 3-4kg/m3And 10-12kg/m of membrane bioreactor3And the high biomass lays a foundation for the high processing efficiency of the system. The technology has obvious advantages in the aspect of removing difficultly-degraded COD, ammonia nitrogen and SS. In addition, in the spatial arrangement of the carriers, the design that the nano ceramic carriers are hung on the top hanging rods and are arranged in series greatly improves the space utilization rate of the biological filter tower system, and the water-gas split is realized in the same space, so that the aerobic and anaerobic effects can be simultaneously performed in the system. Due to good water and gas mass transfer, the system can realize the rapid degradation and removal of BOD, COD and ammonia nitrogen in the wastewater without using aeration equipment. The filter tower adopts ceramic materials as fillers attached to microorganisms, has high-concentration activated sludge, can deeply degrade COD (chemical oxygen demand) and deeply denitrify, and saves the occupied area. The deep nitrification of ammonia nitrogen into nitrate nitrogen provides a receptor for denitrifying phosphorus removal, the denitrifying phosphorus removal realizes the removal of easily degradable organic matters, and the filter tower deeply degrades the difficultly degradable organic matters to realize the reasonable allocation of functional units.
The double-sludge system is the key for realizing denitrifying phosphorus removal, and the denitrifying phosphorus removal technology is to realize synchronous nitrogen and phosphorus removal by using a denitrifying phosphorus removal flora. The biological filter tower has more advantages in removing ammonia nitrogen and refractory organics under the condition of high-concentration sludge, and creates conditions for denitrifying phosphorus removal.
Both combinations emphasize the process integrity and coupling even more: the coupling effect among all processes of the whole system is superior to the effect of a single process combination, firstly, the double-sludge system utilizes nitrate provided by the biological filter tower to carry out anoxic denitrification dephosphorization, and realizes synchronous removal of nitrogen and phosphorus and degradation of difficultly biochemical organic matters; secondly, due to the fact that the high-concentration sludge attached to the membrane degrades the organic matters which are difficult to degrade in the double-sludge system, and the synchronous nitrification and denitrification are performed to remove nitrogen and remove phosphate through aerobic absorption, the biological filter tower has the functions of multi-stage nitrogen and phosphorus removal and COD removal; thirdly, denitrifying phosphorus removal bacteria of a double-sludge system react in the anoxic tank 3, the nitration reaction is carried out in the biological filter tower reaction tank 6, sludge discharge of the denitrifying phosphorus removal bacteria and the nitrification reaction is not influenced mutually, and sludge age control is more flexible. Thus providing the optimal generation running condition for the microbial flora and fully playing the advantages of the functional flora. And fourthly, nitrogen and phosphorus removal is realized only by using a biochemical process, and the residual sludge does not contain phosphorus removal chemical agents, so that the subsequent sludge returning and conversion utilization are facilitated.
The principle of the invention is that a double-sludge denitrification dephosphorization process and a biological filter tower process which are independent are changed into a denitrification dephosphorization coupling biological filter tower process, and the difficulty of low-CN high-standard biochemical dephosphorization is solved by removing one bacterium and two phosphorus; meanwhile, the system integration is carried out by combining the biological filter tower process, so that the integral pollutant removal performance is improved, and the COD removal capacity is enhanced; the denitrification dephosphorization realizes the efficient removal of partial TP and TN and the utilization of easily degradable organic matters, saves carbon source and aeration amount, reduces the sludge discharge amount, and is more energy-saving compared with the traditional process; the biological filter tower realizes the attachment of special membrane filaments to high-sludge-concentration floras, synchronous nitrification and denitrification ammonia nitrogen removal, removal of difficultly-degraded COD and partial TP removal are carried out, aeration is not needed, energy is saved, and the total phosphorus in the effluent is lower due to efficient SS removal.
The system has the following advantages that the parts are mutually associated, and the integrity is more emphasized: firstly, denitrifying phosphorus removal bacteria can simultaneously perform nitrogen and phosphorus removal, thereby avoiding the competition of strains in the traditional activated sludge process and having higher efficiency; deep ammonia nitrogen in the biological filter tower is converted into a denitrification system to provide a high-quality nitrate receptor; meanwhile, the biological filter tower deeply degrades refractory organics which are difficult to utilize in denitrification and dephosphorization, so that the advantages of functional units are complemented and reasonably utilized; thirdly, removing TP by absorbing under the condition that dissolved oxygen DO is brought in by circulating water of the biological filter tower, and simultaneously removing synchronous nitrification and denitrification depth TN; fourthly, the sludge age of the denitrification dephosphorization system and the biological filter tower system is independently controlled, and the process is flexibly regulated and controlled.
In some illustrative embodiments, the present invention also provides a sewage treatment method based on double-sludge denitrification dephosphorization and biological filter tower, comprising the following steps:
firstly, mixing sewage with denitrifying phosphorus removal sludge which flows back from a sedimentation tank in an anaerobic tank, and under the action of denitrifying phosphorus removal bacteria, utilizing an organic carbon source in the sewage to release phosphorus, and simultaneously converting an external carbon source into an internal carbon source by thalli;
then, the mixed solution after phosphorus release enters a pre-anoxic tank, a nitrification supernatant acceptor, namely nitrate, is provided in a biological filter tower reaction tank, meanwhile, energy is provided by a carbon source in denitrification phosphorus removal bacteria decomposition, excessive phosphate absorption is carried out, nitrate is converted into nitrogen, and the remaining organic matter is subjected to common denitrification;
the mixed liquid in the pre-anoxic tank enters the anoxic tank to continue to react, and meanwhile, a carbon source is properly supplemented according to the requirement of removing TN to carry out denitrification;
then the mixed liquid is subjected to mud-water separation in a sedimentation tank, part of sludge enters an anaerobic tank, and the other part of sludge is discharged;
then, the supernatant of the sedimentation tank enters a biological filter tower reaction tank, the supernatant contains ammonia nitrogen and refractory organic matters, air is brought into the biological filter tower reaction tank under the action of a circulating pump, the ammonia nitrogen is degraded into nitrate nitrogen under the action of oxygen by the biological filter tower reaction tank under the action of repeated circulating operation degradation, and meanwhile, the refractory organic matters are decomposed and converted into available denitrification carbon sources under the action of a high-concentration biomembrane to carry out deep denitrification, namely part of the carbon sources are used for the deep denitrification;
and finally, carrying out phosphorus accumulation on the surface of the biological membrane by the oxygen-containing mixed solution and discharging, and discharging the supernatant through a water outlet pool.
Wherein the ORP of the anaerobic tank is-200 to-400 mv, and the retention time is 1 to 3 hours; the ORP of the pre-anoxic tank is-50 mv to-200 mv, and the retention time is 1-2 h; the ORP of the anoxic tank is-100 to-300 mv, and the retention time is 2 to 4 hours; the sludge concentration of the anaerobic tank, the pre-anoxic tank and the anoxic tank is 3500-4500 mg/L.
The invention relates to a sewage treatment method based on double-sludge denitrification dephosphorization and a biological filter tower, which further comprises the following steps:
adjusting the sludge reflux amount of the sedimentation tank, and controlling the sludge reflux amount of denitrification dephosphorization to be 50-100%;
adjusting the nitrate reflux amount of the biological filter tower reaction tank, and controlling the denitrification dephosphorization sludge reflux amount to be 200-300%;
adjusting the circulation quantity of a biological filter tower reaction tank, wherein the circulation quantity of a circulating water pump is 20-30 times of that of inlet water;
supplementing a carbon source to the anoxic pond, wherein the adding amount of C/N is 5/1-2/1;
and controlling the sludge age of the sedimentation tank to be 10-20 days.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Claims (10)
1. A sewage treatment system based on double-sludge denitrification dephosphorization and a biological filter tower is characterized by comprising an anaerobic tank, a pre-anoxic tank, an anoxic tank, a sedimentation tank, a biological filter tower reaction tank and a water outlet tank which are connected in sequence;
the anaerobic tank is connected with the sedimentation tank through a first sludge reflux pump, and the denitrifying phosphorus removal sludge in the sedimentation tank flows back to the anaerobic tank through the first sludge reflux pump to be mixed with sewage and to be subjected to phosphorus release under the action of denitrifying phosphorus removal bacteria;
the sedimentation tank is connected with the biological filter tower reaction tank through a lifting pump, and supernatant in the sedimentation tank enters the biological filter tower reaction tank through the lifting pump;
the water outlet tank is connected with the pre-anoxic tank through a second sludge reflux pump, and nitrate discharged by the biological filter tower reaction tank flows back to the pre-anoxic tank through the second sludge reflux pump to provide a receptor for denitrifying phosphorus removal.
2. The sewage treatment system based on the double-sludge denitrification dephosphorization and biological filter tower as claimed in claim 1, further comprising: the middle tank is arranged between the sedimentation tank and the biological filter tower reaction tank, the middle tank is connected with the biological filter tower reaction tank through the lifting pump, supernatant in the sedimentation tank automatically flows into the middle tank, and the supernatant enters the biological filter tower reaction tank through the lifting pump.
3. The sewage treatment system based on the double-sludge denitrification dephosphorization and biological filter tower as claimed in claim 2, further comprising: and the water outlet tank is connected with the biological filter tower reaction tank through the internal circulating pump.
4. The sewage treatment system based on the double-sludge denitrification dephosphorization and biological filter tower as claimed in claim 3, wherein an ORP (oxidation-reduction potential) instrument and a stirrer are arranged in the anaerobic tank, the pre-anoxic tank and the anoxic tank.
5. The sewage treatment system based on the double-sludge denitrification dephosphorization and biological filter tower as claimed in claim 4, wherein a carbon source adding device is arranged in the anoxic tank.
6. The sewage treatment system based on the double-sludge denitrification dephosphorization and biological filter tower as claimed in claim 5, wherein the sedimentation tank and the biological filter tower reaction tank are provided with sludge discharge pipes.
7. The sewage treatment system based on the double-sludge denitrification dephosphorization and biological filter tower as claimed in claim 6, wherein a first valve for adjusting the sludge reflux amount of the sedimentation tank is arranged on a pipeline connecting the anaerobic tank and the sedimentation tank, a second valve for adjusting the nitrate reflux amount is arranged on a pipeline connecting the water outlet tank and the pre-anoxic tank, and a third valve for adjusting the circulation amount of the filter tower is arranged on a pipeline connecting the water outlet tank and the biological filter tower reaction tank.
8. A sewage treatment method based on double-sludge denitrification dephosphorization and a biological filter tower is characterized by comprising the following steps:
discharging the sewage into an anaerobic tank, mixing the sewage with denitrifying phosphorus removal sludge which flows back from a sedimentation tank, performing phosphorus release by using an organic carbon source in the sewage under the action of denitrifying phosphorus removal bacteria, and simultaneously converting an external carbon source into an internal carbon source by using thalli;
the mixed solution after phosphorus release enters a pre-anoxic tank, nitrate discharged from a reaction tank of the biological filter tower is used as a nitrification supernatant acceptor, the denitrification phosphorus removal bacteria decompose an internal carbon source to provide energy, excessive phosphate is absorbed, the nitrate is converted into nitrogen, and the rest organic matters are subjected to denitrification;
the mixed liquid in the pre-anoxic tank enters an anoxic tank for denitrification;
the mixed liquid in the anoxic tank enters the sedimentation tank for mud-water separation, one part of denitrification dephosphorization sludge flows back to the anaerobic tank, and the other part of sludge is discharged;
and enabling the supernatant in the sedimentation tank to flow to the biological filter tower reaction tank, circularly degrading ammonia nitrogen into nitrate nitrogen, and decomposing and converting refractory organic matters into a denitrification carbon source under the action of a biological membrane.
9. The sewage treatment method based on the double-sludge denitrification dephosphorization and biological filter tower according to claim 8, characterized in that the ORP of the anaerobic tank is-200 mv to-400 mv, and the retention time is 1 h to 3 h; the ORP of the pre-anoxic tank is-50 mv to-200 mv, and the retention time is 1-2 h; the ORP of the anoxic tank is-100 mv to-300 mv, and the retention time is 2-4 h; the sludge concentration of the anaerobic tank, the pre-anoxic tank and the anoxic tank is 3500-4500 mg/L.
10. The sewage treatment method based on the double-sludge denitrification dephosphorization and biological filter tower according to claim 9, characterized by further comprising the following steps:
adjusting the sludge reflux amount of the sedimentation tank, and controlling the denitrification dephosphorization sludge reflux amount to be 50-100%;
adjusting the nitrate reflux amount of the biological filter tower reaction tank, and controlling the denitrification dephosphorization sludge reflux amount to be 200-300%;
adjusting the circulation quantity of the biological filter tower reaction tank, wherein the circulation quantity of a circulating water pump is 20-30 times of that of inlet water;
supplementing a carbon source to the anoxic pond, wherein the adding amount of C/N is 5/1-2/1;
and controlling the sludge age of the sedimentation tank to be 10-20 d.
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