CN116199338A - Advanced denitrification and dephosphorization module and method for rural domestic sewage household facility - Google Patents
Advanced denitrification and dephosphorization module and method for rural domestic sewage household facility Download PDFInfo
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Classifications
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- 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
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a rural domestic sewage household facility deep denitrification and dephosphorization module and a method thereof, wherein the module comprises a water inlet area, a deep denitrification area, a deep dephosphorization area and a water outlet area which are communicated in sequence, and each area is separated by a baffle; the sewage flow direction in the deep denitrification and dephosphorization module is as follows: the water enters from the water inlet at the upper part of the water inlet zone, enters into the deep denitrification zone through the lower part of the partition plate between the water inlet zone and the deep denitrification zone, enters into the deep dephosphorization zone from the upper part of the partition plate between the deep denitrification zone and the deep dephosphorization zone, enters into the water outlet zone from the lower part of the partition plate between the deep dephosphorization zone and the water outlet zone, and is discharged from the water outlet at the upper part of the water outlet zone; the water inlet area, the deep denitrification area, the deep dephosphorization area and the water outlet area are respectively filled with filler. The deep denitrification and dephosphorization module can be connected to the sewage household facility to carry out deep denitrification and dephosphorization on the effluent of the sewage household facility.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a rural domestic sewage household facility deep denitrification and dephosphorization module and a method.
Background
Rural environmental management has been increasingly emphasized in recent years, and is especially prominent and sensitive to water environment management. Because of the problems of difficult construction, operation and maintenance fund guarantee, lack of professional technicians, improper treatment process selection and the like, rural domestic sewage treatment becomes a prominent short board for current rural human living environment improvement. Especially, the sewage treatment technology aiming at the water quality sensitive area with higher total nitrogen and total phosphorus removal requirements is relatively lacking. In many local standards, strict requirements are placed on rural domestic sewage treatment devices, including total nitrogen, total phosphorus and other emissions of household facilities.
The household facilities are suitable for farmers who are relatively decentralized, difficult to arrange pipe networks and conduct centralized treatment or high in cost. However, the rural domestic sewage household facilities currently applied are basically a reduced version of the urban domestic sewage treatment process, such as AAO, AO and other processes and devices commonly used in urban domestic sewage treatment, and are also commonly applied to rural domestic sewage household facilities. For example, chinese patent publication No. CN218025598U discloses a rural domestic sewage treatment apparatus employing an AO process, which sequentially includes a water inlet mixing zone, an alternative anoxic/aerobic zone, a parallel secondary sedimentation tank i and a secondary sedimentation tank ii, a parallel disinfection zone and a mud storage tank, and a parallel dosing room and an apparatus room, wherein a combined filler is disposed in the alternative anoxic/aerobic zone, a fan i and a fan ii are disposed in the apparatus room, the fan i and the fan ii are respectively connected with an aeration main pipe i and an aeration main pipe ii, the aeration main pipe i is connected with two paths of aeration branch pipes i, the two paths of aeration branch pipes i are respectively provided with aeration valves i and respectively connected with an aeration disc i, the aeration main pipe ii is connected with two paths of aeration branch pipes ii, and the two paths of aeration branch pipes ii are respectively provided with aeration valves ii and respectively connected with an aeration disc ii. The Chinese patent document with the publication number of CN114162972A discloses a drop reoxygenation multistage AO rural domestic sewage treatment device, which comprises a distribution pool, an A pool, at least two stages of OA pools and an O pool which are arranged in a stepped manner, wherein the distribution pool divides sewage flow into the A pool and the A-stage reaction zone of the OA pool in proportion through weirs, gravity flows are distributed to the A pool and the A-stage reaction zone of the OA pool at the same time, the A pool is upward flow, the outside of the reaction zone is connected with a drop device, the drop device comprises two square water distribution tanks with triangular weirs at two sides, two detachable drop baffles with a plurality of slits are arranged, the O-stage reaction zone of the OA pool is connected under the drop device, the O-stage reaction zone of the OA pool is separated by a baffle to divide the O-stage reaction zone into downward flow and the A-stage reaction zone which is upward flow, the outside of the A-stage reaction zone is connected with the same drop device of the A pool, the O-stage reaction zone of the same OA pool is connected under the O-stage reaction zone, and the O-stage drop device of the last stage OA pool is connected with the O pool under the drop device.
The rural domestic sewage has the characteristics of large water quality fluctuation, less carbon source, low carbon-nitrogen (C/N) ratio and the like. For domestic sewage with low C/N ratio, the enhanced denitrification is realized through nitrification and denitrification, and the carbon source is often required to be additionally added, so that the enhanced denitrification is difficult to realize in household facilities. The processes such as AAO, AO and the like commonly adopted by household facilities are basically processes combined with biomembrane methods and the like, microorganisms are basically hung on the filler, the sludge discharge amount is small, and the aim of removing phosphorus is difficult to achieve through the traditional anaerobic phosphorus release and aerobic excessive phosphorus absorption and a large amount of sludge discharge. Therefore, in water quality sensitive areas with higher requirements on total nitrogen and total phosphorus removal, the problem that the total nitrogen and the total phosphorus are difficult to reach standards is commonly existed.
The development of a high-efficiency deep denitrification and dephosphorization module suitable for rural domestic sewage inflow water quality and quantity features is one of the ways of solving the problems.
Disclosure of Invention
The invention provides a rural domestic sewage household facility deep denitrification and dephosphorization module which can be accessed into a sewage household facility to carry out deep denitrification and dephosphorization on effluent of the sewage household facility.
The technical scheme of the invention is as follows:
a rural domestic sewage household facility deep denitrification and dephosphorization module comprises a water inlet area, a deep denitrification area, a deep dephosphorization area and a water outlet area which are communicated in sequence, wherein each area is separated by a partition board;
the sewage flow direction in the deep denitrification and dephosphorization module is as follows: the water enters from the water inlet at the upper part of the water inlet zone, enters into the deep denitrification zone through the lower part of the partition plate between the water inlet zone and the deep denitrification zone, enters into the deep dephosphorization zone from the upper part of the partition plate between the deep denitrification zone and the deep dephosphorization zone, enters into the water outlet zone from the lower part of the partition plate between the deep dephosphorization zone and the water outlet zone, and is discharged from the water outlet at the upper part of the water outlet zone;
the water inlet area, the deep denitrification area, the deep dephosphorization area and the water outlet area are respectively filled with filler.
Preferably, the partition plate between the water inlet area and the deep denitrification area, the partition plate between the deep dephosphorization area and the water outlet area are provided with discharge holes from the position 15-25cm away from the bottom, the aperture of the discharge holes is 5-10mm, and the interval between the holes is 2-3mm until the depth is 30-40% away from the bottom;
and a partition plate between the deep denitrification region and the deep dephosphorization region starts to punch holes from the position 8-15cm away from the top of the partition plate, the aperture is 5-10mm, and the interval between the holes is 2-3mm until the holes are leveled with the height of the water outlet.
Preferably, the effective volume of the deep denitrification and dephosphorization module is 0.4-1 times of the designed water treatment volume, the effective volume of the deep dephosphorization area is 1-3 times of the designed water treatment volume, and the effective volumes of the water inlet area and the water outlet area are 0.2-0.4 times of the designed water treatment volume.
Preferably, the filler of the deep denitrification zone comprises sulfur particles with the particle size of 6-9mm, loofah sponge and zeolite with the particle size of 3-5 mm.
Further preferably, the filling method is that sulfur and zeolite are mixed according to a volume ratio of 1:1, uniformly mixing, filling the mixture into a mesh bag with 40-90 meshes, starting to fill the mesh bag containing sulfur and zeolite particles at the bottom, paving a layer of loofah sponge after filling one layer, paving a layer of sulfur and zeolite mixed particles filled by the mesh bag, and repeatedly and alternately superposing the mixed particles on the top of a deep denitrification region.
The deep denitrification area utilizes sulfur and loofah to carry out autotrophic and heterotrophic coupling denitrification, so that the denitrification efficiency is greatly improved, meanwhile, the coupling denitrification reduces the generation of sulfate, and the addition of the loofah can promote the degradation of the generated sulfate, so that the double-circulation degradation of nitrogen and sulfur is achieved. The coupling denitrification system composed of sulfur and loofah is also beneficial to the stability of pH, the phenomenon of independent sulfur autotrophic peracid can not occur, and the pH is maintained between 6 and 7. The loofah sponge can slowly provide a slow-release carbon source for a long time, and can not be released in a large amount in a short time, so that secondary pollution of organic matters in effluent is caused. The loofah sponge can also provide a large amount of attachment space for microorganism growth, and a large amount of netlike pore structures are also beneficial to enhancing contact with sewage and improving removal of pollutants.
The autotrophic and heterotrophic coupling denitrification system composed of sulfur and loofah is used for denitrification according to the nitrogen content of the inlet water, has strong buffering and adjusting capacity on the fluctuation of the quality and quantity of the inlet water, and guarantees the quality of the outlet water.
The pH value of the effluent water of the deep denitrification area is 6-7, the weak acid pH value is not only favorable for deep denitrification, but also favorable for dissolution of iron in the iron-carbon filler, avoids hardening failure of the iron-carbon filler during long-term operation, is favorable for strengthening dephosphorization, and is also favorable for maintaining the pH value of the deep dephosphorization module between 7 and 9.
The sulfur and zeolite are combined and placed in the mesh bag, so that the scouring loss of the sulfur is avoided, the zeolite can adsorb microorganisms, the autotrophic denitrification reaction of the sulfur is facilitated, and the pH value of the denitrification microenvironment is regulated.
Further preferably, the addition amount of sulfur is calculated to be 100-150 kg/t according to the daily treatment water amount of design, and the addition amount of loofah sponge is calculated to be 5-15 kg/t according to the daily treatment water amount of design.
Preferably, the deep dephosphorization zone filler comprises 3-6mm particle size iron carbon and 3-6mm particle size gravel, wherein the volume ratio of the iron carbon to the gravel is 3-5: 1.
furthermore, the filling amount of the iron-carbon filler is 1 to 1.5t/t according to the design daily treatment water amount.
Preferably, the bottom of the deep dephosphorization zone is provided with an aeration pipe, the aeration amount is 50-200L/min, and the aeration time is 16-24 h/d.
Preferably, the filling materials of the water inlet area and the water outlet area are gravel with the particle size of 3-6 mm.
The method for treating rural domestic sewage by adopting the deep denitrification and dephosphorization module comprises the following steps:
the method comprises the steps of (1) introducing domesticated sulfur autotrophic sludge and mixed sludge of anaerobic tank sludge of an urban sewage treatment plant into a deep denitrification region, wherein the volume ratio of the sulfur autotrophic sludge to the anaerobic tank sludge is 1:1, a step of;
the deep denitrification and dephosphorization module is connected to a water outlet of a household facility, the deep denitrification and dephosphorization module starts aeration, the water flow is 0.5 times of the design treatment water flow just before starting operation, and after the total nitrogen treatment effect is stable, the water inflow is regulated to the design daily treatment water flow.
Compared with the prior art, the invention has the beneficial effects that:
(1) The deep denitrification and dephosphorization module can be used for new construction, can also be used for standard transformation of original household facilities, and is convenient to operate and operate after being directly connected with a household device.
(2) The water inlet area, the water outlet area, the deep denitrification area and the deep phosphorus area are subjected to modularized design, so that the replacement and operation maintenance of the deep denitrification and dephosphorization filler are facilitated, and particularly the deep denitrification area is convenient to replace the filler. And in the deep dephosphorization zone, an appropriate amount of iron-carbon filler is supplemented annually according to the consumption condition of the filler. The deep denitrification and dephosphorization module is convenient to operate and maintain as a whole.
(3) The baffle partition plate is adopted, and the flow state of baffling of the upper inlet and the lower outlet is favorable for sewage to fully contact with the filler, so that the denitrification and dephosphorization effects are enhanced.
Drawings
FIG. 1 is a schematic structural view of a deep denitrification and dephosphorization module according to an embodiment of the present invention;
fig. 2 is a top view of fig. 1.
Detailed Description
Example 1
And the design treatment capacity of the deep denitrification and dephosphorization module is 1t/d.
The designed deep denitrification and dephosphorization module is pre-connected with 1t/d rural domestic sewage household AO facility.
As shown in FIGS. 1 and 2, the depth denitrification and dephosphorization module is 2.6m long, 1m wide and 1m high, and comprises a water inlet area, a depth denitrification area, a depth dephosphorization area and a water outlet area, wherein the height of a water inlet is 0.85m, the height of a water outlet is 0.8m, each area is separated by a partition plate, the width of each area is 1m, the height is 1m, the water inlet area is 0.3m in length of 2.6m, the interval of the depth denitrification area is 0.625m, the interval of the depth dephosphorization area is 1.375m, and the interval of the water outlet area is 0.3m.
The flow direction of water is that the upper water inlet enters the water inlet region, enters the deep denitrification region through the lower part of the partition plate between the water inlet region and the deep denitrification region, enters the deep dephosphorization region from the upper part of the partition plate between the deep denitrification region and the deep dephosphorization region, enters the water outlet region from the lower part of the partition plate between the deep dephosphorization region and the water outlet region, and flows out from the water outlet region. The partition plate between the water inlet area and the deep denitrification area, the partition plate between the deep denitrification area and the water outlet area are provided with discharge holes from the position 20cm away from the bottom of the deep denitrification and dephosphorization module, the aperture is 8mm, the interval between the holes is 2mm, and the distance is 0.35 m away from the bottom of the deep denitrification and dephosphorization module. The partition board of the deep denitrification area and the deep dephosphorization area is provided with a hole which is punched from the position 10cm away from the top of the partition board, the aperture is 8mm, the interval between the holes is 2mm, and the height is 0.8m away from the water outlet of the deep denitrification and dephosphorization module.
Deep denitrification and dephosphorization module, and effective volume of the deep denitrification area is 0.5m 3 . The effective volume of the deep dephosphorization zone is 1.1m for 0.5 times of the designed water treatment volume 3 Is 1.1 times of the designed water treatment amount, and the effective volumes of the water inlet area and the water outlet area are 0.24m 3 Is 0.24 times of the designed treated water amount.
The filler of the deep denitrification area consists of sulfur particles with the particle size of 6-9mm, loofah sponge and zeolite with the particle size of 3-5mm, and the filling method is that the volume ratio of the sulfur to the zeolite is 1:1, uniformly mixing, filling the mixture into a mesh bag with 90 meshes, starting to fill the mesh bag containing sulfur and zeolite particles at the bottom, paving a layer of loofah sponge after filling one layer, paving a layer of sulfur and zeolite mixed particles filled by the mesh bag, and repeatedly and alternately superposing the mixed particles on the top of a deep denitrification region. The addition amount of sulfur is 125kg, the daily design treatment water amount is calculated to be 125kg/t, the addition amount of the loofah sponge is 10kg, and the daily design treatment water amount is calculated to be 10kg/t.
The deep dephosphorization zone filler is 3-6mm iron carbon filler and 3-6mm gravel mixed filler, and the volume ratio of the mixed filler is 3:1. the filling amount of the iron-carbon filler is 1.2t, which is 1.2t/t of the design daily treatment water amount. An aeration pipe is arranged at the bottom of the deep dephosphorization zone, the aeration amount is 80L/min, and the aeration time is 24h/d.
The filling materials in the water inlet area and the water outlet area are all 3-6mm gravel.
Second, treatment method
In the water inlet area, the water outlet area and the deep denitrification areaFilling the filler into the deep dephosphorization zone, and then, introducing the domesticated sulfur autotrophic sludge and the mixed sludge of the anaerobic tank sludge of the urban sewage treatment plant into the deep denitrification zone, wherein the volume ratio of the mixed sludge is 1:1, introducing AO facility to treat effluent, aerating in a deep dephosphorization module for 24h, wherein the water flow is 0.5m during the operation immediately after the start 3 After the total nitrogen treatment effect is stable in 15 days of operation, the water inflow is regulated to be 1t/d, the water inflow of the deep denitrification and dephosphorization module is collected, the water outflow of the deep denitrification and dephosphorization module is detected for water quality, the water outflow of the deep denitrification and dephosphorization module is detected for 1 time per week, and the continuous operation is carried out for 3 months.
Comparative example 1
In comparison with example 1, the deep denitrification and dephosphorization module of comparative example 1 was not partitioned by a partition, and the type and amount of filler were the same as those of example 1, and mixed filling was performed. And collecting water inlet and outlet after running stably, detecting 1 time per week, and continuously running for 3 months.
Comparative example 2
In comparison with example 1, in comparative example 2, the bottom or upper portion of each partition plate was not opened with 8mm holes, and the partition plates between the water inlet zone and the deep denitrification zone, and between the deep denitrification zone and the deep dephosphorization zone were opened with a communication port at a height of 0.8 m. Otherwise, the method is the same as in the embodiment 1, after the operation is stable, the water quality detection is carried out on the water inlet of the deep denitrification and dephosphorization module, the water outlet of the deep denitrification and dephosphorization module, the water quality detection is carried out on the water outlet of the deep denitrification and dephosphorization module, the detection is carried out for 1 time per week, and the operation is carried out continuously for 3 months.
Comparative example 3
In comparative example 3, the loofah sponge was not packed in the deep denitrification zone as in example 1, and the other steps were the same as in example 1. And collecting water inlet of the deep denitrification and dephosphorization module, discharging water of the deep denitrification and dephosphorization area, detecting water quality of the water discharged by the deep denitrification and dephosphorization module for 1 time per week, and continuously running for 3 months.
Comparative example 4
In comparative example 4, zeolite was not packed in the deep denitrification zone as in example 1, and the other components were the same as in example 1. And collecting water inlet of the deep denitrification and dephosphorization module, discharging water of the deep denitrification and dephosphorization area, detecting water quality of the water discharged by the deep denitrification and dephosphorization module for 1 time per week, and continuously running for 3 months.
Comparative example 5
In comparative example 5, sulfur was not charged in the deep denitrification zone as in example 1, but the same as in example 1. And collecting water inlet of the deep denitrification and dephosphorization module, discharging water of the deep denitrification and dephosphorization area, detecting water quality of the water discharged by the deep denitrification and dephosphorization module for 1 time per week, and continuously running for 3 months.
Comparative example 6
Comparative example 6, which was not charged with iron carbon in the deep dephosphorization zone, was identical to example 1. And collecting water inlet of the deep denitrification and dephosphorization module, discharging water of the deep denitrification and dephosphorization area, detecting water quality of the water discharged by the deep denitrification and dephosphorization module for 1 time per week, and continuously running for 3 months.
Comparative example 7
Comparative example 7, which had an iron carbon content of 0.9t in the deep dephosphorization zone, was compared with example 1, except that the same was conducted as in example 1. And collecting water inlet of the deep denitrification and dephosphorization module, discharging water of the deep denitrification and dephosphorization area, detecting water quality of the water discharged by the deep denitrification and dephosphorization module for 1 time per week, and continuously running for 3 months.
Comparative example 8
Comparative example 8, which had an iron carbon content of 1.6t in the deep dephosphorization zone, was compared with example 1, except that the same was conducted as in example 1. And collecting water inlet of the deep denitrification and dephosphorization module, discharging water of the deep denitrification and dephosphorization area, detecting water quality of the water discharged by the deep denitrification and dephosphorization module for 1 time per week, and continuously running for 3 months.
Comparative example 9
In comparison with example 1, in comparative example 9, the deep denitrification zone and the deep dephosphorization zone are all mixed with 3-5mm zeolite and 3-6mm gravel, and the volume ratio of zeolite to gravel is 3:1. otherwise, the same as in example 1 was used. And collecting water inlet of the deep denitrification and dephosphorization module, discharging water of the deep denitrification and dephosphorization area, detecting water quality of the water discharged by the deep denitrification and dephosphorization module for 1 time per week, and continuously running for 3 months.
Comparative example 10
In comparative example 10, the inflow water flow rate of the deep denitrification and dephosphorization module was adjusted to 3t/d, that is, the inflow water impact load was high, 3 times the design throughput, as compared with example 1, and otherwise, the same as in example 1 was applied.
Comparative example 11
In comparative example 11, the sulfur particles and zeolite particles were not packed with the mesh bag, and the sulfur particles, zeolite particles and retinervus Luffae fructus were mixed randomly and then filled into the deep denitrification zone, in comparison with example 1, except that the process was the same as in example 1.
Results:
example 1 and comparative examples 1-9, the influent water was the same effluent from the anoxic-aerobic tank, and the influent water quality of the deep denitrification and dephosphorization module was the same, and during 3 months of operation, the influent water quality of the deep denitrification and dephosphorization module was: 20.6-50.8mg/L, the average value is 29.2mg/L; ammonia nitrogen: 0.21-1.12mg/L, with an average value of 0.82mg/L; total nitrogen: 35.5-82.6mg/L, with an average value of 62.8mg/L; total phosphorus: 4.2-11.6mg/L, average value of 8.9mg/L, pH of 6.9-7.8, average value of 7.2; sulfate radical: 55.6-80.1mg/L, and the average value is 68.2mg/L.
After 3 months of operation, the average value of the water output of example 1 and comparative examples 1 to 11:
example 1:
deep denitrification effluent: COD average value 46.8mg/L, ammonia nitrogen average value 0.71mg/L, total nitrogen average value 9.1mg/L, total phosphorus average value 7.8mg/L, pH average value 6.6 and sulfate average value 142.6mg/L.
Deep denitrification and dephosphorization effluent: COD average value 28.1mg/L, ammonia nitrogen average value 0.72mg/L, total nitrogen average value 8.9mg/L, total phosphorus average value 0.72, pH average value 8.6, sulfate radical average value 156.2mg/L, total nitrogen removal rate 85.8%, total phosphorus removal rate 91.9%.
Comparative example 1:
deep denitrification and dephosphorization effluent: COD average value 31.5mg/L, ammonia nitrogen average value 0.85mg/L, total nitrogen average value 32.3mg/L, total phosphorus average value 2.8mg/L, pH average value 8.9, sulfate radical average value 148.9mg/L, total nitrogen removal rate 48.6% and total phosphorus removal rate 68.5%.
Comparative example 2:
deep denitrification effluent: COD average value 47.5mg/L, ammonia nitrogen average value 0.75mg/L, total nitrogen average value 18.5mg/L, total phosphorus average value 8.1mg/L, pH average value 6.8 and sulfate radical average value 138.7mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 29.6mg/L, ammonia nitrogen average value 0.73mg/L, total nitrogen average value 18.2mg/L, total phosphorus average value 2.1mg/L, pH average value 8.7, sulfate radical average value 151.6mg/L, total nitrogen removal rate 71%, total phosphorus removal rate 76.4%.
Comparative example 3:
deep denitrification effluent: COD average value 27.8mg/L, ammonia nitrogen average value 0.78mg/L, total nitrogen average value 31.3mg/L, total phosphorus average value 8.2mg/L, pH average value 6.1, sulfate average value 178.6mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 27.2mg/L, ammonia nitrogen average value 0.81mg/L, total nitrogen average value 31mg/L, total phosphorus average value 0.65mg/L, pH average value 8.6, sulfate radical average value 179.8mg/L, total nitrogen removal rate 50.6% and total phosphorus removal rate 92.7%.
Comparative example 4:
deep denitrification effluent: COD average value 49.9mg/L, ammonia nitrogen average value 0.81mg/L, total nitrogen average value 13.2mg/L, total phosphorus average value 8.6mg/L, pH average value 6.4, sulfate average value 139.7mg/L.
Deep denitrification and dephosphorization module effluent: COD average value is 48.5mg/L, ammonia nitrogen average value is 0.85mg/L, total nitrogen average value is 12.9mg/L, total phosphorus average value is 0.98mg/L, pH average value is 8.5, sulfate radical average value is 152.1mg/L, total nitrogen removal rate is 79.5%, and total phosphorus removal rate is 89%.
Comparative example 5:
deep denitrification effluent: COD average value 54.6mg/L, ammonia nitrogen average value 0.75mg/L, total nitrogen average value 38.3mg/L, total phosphorus average value 7.9mg/L, pH average value 7.0, sulfate average value 68.6mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 29.8mg/L, ammonia nitrogen average value 0.75, total nitrogen average value 38.1mg/L, total phosphorus average value 2.2mg/L, pH average value 9.4, sulfate radical average value 68.8mg/L, total nitrogen removal rate 39.3% and total phosphorus removal rate 75.3%.
Comparative example 6:
deep denitrification effluent: COD average value 46.9mg/L, ammonia nitrogen average value 0.75mg/L, total nitrogen average value 9.2mg/L, total phosphorus average value 7.9mg/L, pH average value 6.6 and sulfate radical average value 143.1mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 27.8mg/L, ammonia nitrogen average value 0.71mg/L, total nitrogen average value 8.9mg/L, total phosphorus average value 7.6, pH average value 6.9, sulfate radical average value 143.8mg/L, total nitrogen removal rate 85.8%, total phosphorus removal rate 14.6%.
Comparative example 7:
deep denitrification effluent: COD average value 46.9mg/L, ammonia nitrogen average value 0.72mg/L, total nitrogen average value 9.2mg/L, total phosphorus average value 7.8mg/L, pH average value 6.7, sulfate average value 142.1mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 28.9mg/L, ammonia nitrogen average value 0.73mg/L, total nitrogen average value 9.1mg/L, total phosphorus average value 2.8mg/L, pH average value 8.1, sulfate radical average value 151.2mg/L, total nitrogen removal rate 85.5%, total phosphorus removal rate 68.5%.
Comparative example 8:
deep denitrification effluent: COD average value 46.5mg/L, ammonia nitrogen average value 0.75mg/L, total nitrogen average value 9.2mg/L, total phosphorus average value 7.9mg/L, pH average value 6.7 and sulfate radical average value 143.5mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 29.2mg/L, ammonia nitrogen average value 0.85mg/L, total nitrogen average value 8.8mg/L, total phosphorus average value 0.55mg/L, pH average value 9.6, sulfate radical average value 69.5mg/L, total nitrogen removal rate 86%, total phosphorus removal rate 93.8%.
Comparative example 9:
deep denitrification effluent: COD average value 28.6mg/L, ammonia nitrogen average value 0.73mg/L, total nitrogen average value 57.6mg/L, total phosphorus average value 7.8mg/L, pH average value 7.1 and sulfate average value 69.1mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 28.1mg/L, ammonia nitrogen average value 0.69mg/L, total nitrogen average value 56.5mg/L, total phosphorus average value 6.36mg/L, pH average value 7.2, sulfate radical average value 68.8mg/L, total nitrogen removal rate 10% and total phosphorus removal rate 28.5%.
Comparative example 10:
deep denitrification effluent: COD average value 45.2mg/L, ammonia nitrogen average value 0.81mg/L, total nitrogen average value 10.5mg/L, total phosphorus average value 8.2mg/L, pH average value 6.7, sulfate average value 139.5mg/L.
Deep denitrification and dephosphorization module effluent: COD average value 28.9mg/L, ammonia nitrogen average value 0.76mg/L, total nitrogen average value 10.2mg/L, total phosphorus average value 0.85mg/L, pH average value 8.4, sulfate radical average value 152.8mg/L, total nitrogen removal rate 83.8%, total phosphorus removal rate 90.4%.
Example 11:
deep denitrification effluent: COD average value is 55.8mg/L, ammonia nitrogen average value is 0.81mg/L, total nitrogen average value is 16.8mg/L, total phosphorus average value is 7.9mg/L, pH average value is 6.5, sulfate radical average value is 156.8mg/L.
Deep denitrification and dephosphorization effluent: COD average value 36.5mg/L, ammonia nitrogen average value 0.79mg/L, total nitrogen average value 16.5mg/L, total phosphorus average value 0.89, pH average value 8.7, sulfate radical average value 159.9mg/L, total nitrogen removal rate 73.2% and total phosphorus removal rate 90%.
Summarizing:
comparison of example 1 with comparative example 1 and comparative example 2 shows that the deep denitrification and dephosphorization module is divided into a water inlet area, a deep denitrification area, a deep dephosphorization area and a water outlet area according to a baffle flow state structure of upper inlet and lower outlet, and has the best denitrification and dephosphorization effect.
Compared with the common filler, the filler and the structure filled according to the patent of the invention have the function of strengthening the deep denitrification and dephosphorization, and the deep denitrification and dephosphorization module disclosed by the invention has strong impact resistance and can effectively ensure the quality of effluent.
Comparison of example 1 with comparative example 5, comparative example 3 and comparative example 4 shows that sulfur, retinervus Luffae fructus and zeolite all play a corresponding role in the deep denitrification module, and the combination of the three has the effects of synergetic denitrification and pH adjustment, and the sulfur has the greatest contribution to denitrification, and then the retinervus Luffae fructus and finally the zeolite.
Comparison of example 1 with comparative examples 5, 6, 7 and 8 shows that iron carbon plays a major role in phosphorus removal, but when the iron carbon addition exceeds the addition parameters specified in the patent of the invention, the pH is easily made to be greater than 9, so that the emission standard is not reached. The deep denitrification module composed of sulfur, luffa and zeolite provides a good pH condition for the iron-carbon deep dephosphorization module to strengthen dephosphorization and maintain pH below 9.
A comparison of example 1 with comparative example 11 shows that the deep denitrification zone packing arrangement provided by this patent provides better denitrification than unordered packing and is more conducive to packing replacement.
The foregoing embodiments have described the technical solutions and advantages of the present invention in detail, and it should be understood that the foregoing embodiments are merely illustrative of the present invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like that fall within the principles of the present invention should be included in the scope of the invention.
Claims (10)
1. The rural domestic sewage household facility deep denitrification and dephosphorization module is characterized by comprising a water inlet area, a deep denitrification area, a deep dephosphorization area and a water outlet area which are sequentially communicated, wherein each area is separated by a partition plate;
the sewage flow direction in the deep denitrification and dephosphorization module is as follows: the water enters from the water inlet at the upper part of the water inlet zone, enters into the deep denitrification zone through the lower part of the partition plate between the water inlet zone and the deep denitrification zone, enters into the deep dephosphorization zone from the upper part of the partition plate between the deep denitrification zone and the deep dephosphorization zone, enters into the water outlet zone from the lower part of the partition plate between the deep dephosphorization zone and the water outlet zone, and is discharged from the water outlet at the upper part of the water outlet zone;
the water inlet area, the deep denitrification area, the deep dephosphorization area and the water outlet area are respectively filled with filler.
2. The rural domestic sewage household facility deep denitrification and dephosphorization module according to claim 1, wherein a partition plate between the water inlet area and the deep denitrification area, a partition plate between the deep denitrification area and the water outlet area are provided with discharge holes from 15cm to 25cm away from the bottom, the hole diameter of the discharge holes is 5mm to 10mm, and the interval between the holes is 2mm to 3mm until the depth is 30% to 40% away from the bottom;
and a partition plate between the deep denitrification region and the deep dephosphorization region starts to punch holes from the position 8-15cm away from the top of the partition plate, the aperture is 5-10mm, and the interval between the holes is 2-3mm until the holes are leveled with the height of the water outlet.
3. The rural domestic sewage household facility deep denitrification and dephosphorization module according to claim 1, wherein the effective volume of the deep denitrification and dephosphorization area is 0.4-1 times of the designed treatment water volume, the effective volume of the deep dephosphorization area is 1-3 times of the designed treatment water volume, and the effective volumes of the water inlet area and the water outlet area are 0.2-0.4 times of the designed treatment water volume.
4. The deep denitrification and dephosphorization module for rural domestic sewage household facilities according to claim 1, wherein the filler of the deep denitrification area comprises sulfur particles with the particle size of 6-9mm, luffa and zeolite with the particle size of 3-5 mm.
5. The rural domestic sewage household facility deep denitrification and dephosphorization module according to claim 4, wherein the filling method is that sulfur and zeolite are mixed according to a volume ratio of 1:1, uniformly mixing, filling the mixture into a mesh bag with 40-90 meshes, starting to fill the mesh bag containing sulfur and zeolite particles at the bottom, paving a layer of loofah sponge after filling one layer, paving a layer of sulfur and zeolite mixed particles filled by the mesh bag, and repeatedly and alternately superposing the mixed particles on the top of a deep denitrification region.
6. The deep denitrification and dephosphorization module for rural domestic sewage household facilities according to claim 4 or 5, wherein the sulfur addition amount is 100-150 kg/t calculated according to the daily water treatment amount of design, and the loofah sponge addition amount is 5-15 kg/t calculated according to the daily water treatment amount of design.
7. The rural domestic sewage household facility deep denitrification and dephosphorization module according to claim 1, wherein the deep dephosphorization zone filler comprises iron carbon with the particle size of 3-6mm and gravel with the particle size of 3-6mm, and the volume ratio of the iron carbon to the gravel is 3-5: 1.
8. the rural domestic sewage household facility deep denitrification and dephosphorization module according to claim 7, wherein the filling amount of the iron-carbon filler is 1-1.5 t/t calculated according to the daily treatment water amount.
9. The rural domestic sewage household facility deep denitrification and dephosphorization module according to claim 1, wherein an aeration pipe is arranged at the bottom of the deep dephosphorization zone, the aeration amount is 50-200L/min, and the aeration time is 16-24 h/d.
10. A method for deeply removing nitrogen and phosphorus in rural domestic sewage household facilities, which is characterized in that the adopted device is the deep nitrogen and phosphorus removal module as claimed in any one of claims 1-9;
the method comprises the steps of (1) introducing domesticated sulfur autotrophic sludge and mixed sludge of anaerobic tank sludge of an urban sewage treatment plant into a deep denitrification region, wherein the volume ratio of the sulfur autotrophic sludge to the anaerobic tank sludge is 1:1, a step of;
the deep denitrification and dephosphorization module is connected to a water outlet of a household facility, the deep denitrification and dephosphorization module starts aeration, the water flow is 0.5 times of the design treatment water flow just before starting operation, and after the total nitrogen treatment effect is stable, the water inflow is regulated to the design daily treatment water flow.
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