CN113371924A - Advanced sewage treatment process capable of meeting quasi-IV-class water standard - Google Patents
Advanced sewage treatment process capable of meeting quasi-IV-class water standard Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F2209/16—Total nitrogen (tkN-N)
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- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a sewage advanced treatment process capable of meeting the standard of quasi-IV type water, wherein the effluent of a secondary sedimentation tank or a sewage treatment plant is conveyed to a composite denitrification biological tank through a pipeline; degrading COD, ammonia nitrogen and total nitrogen of the entering sewage in a composite denitrification biological tank; after degradation, conveying the primary treated sewage to a high-efficiency sedimentation tank through a pipeline for sewage treatment; adding a phosphorus removal agent into the high-efficiency sedimentation tank to carry out chemical phosphorus removal; conveying the sewage subjected to secondary treatment to a fiber rotary disc filter tank through a pipeline for sewage treatment; filtering in a fiber rotary disc filter to remove suspended matters in the fiber rotary disc filter, and conveying the sewage to an ozone catalytic oxidation tank through a pipeline for further treatment; ozone in the ozone catalytic oxidation pond generates strong oxidizing hydroxyl free radicals under the action of a catalyst to thoroughly remove organic matters which are difficult to degrade or not biodegradable. The invention can completely meet the standard requirement of surface quasi-IV water and has stable and reliable operation effect.
Description
Technical Field
The invention relates to the technical field of sewage treatment plants in municipal or industrial parks, in particular to a sewage advanced treatment process capable of meeting the standard of quasi-IV water.
Background
At present, the discharge standard of pollutants for urban sewage treatment plants (GB18918-2002) is executed by most provinces and cities for the discharge of urban sewage treatment plants in China. With the needs of improvement of water environment quality, pollutant emission reduction, water resource protection, recycling and the like in various places, from 2012, local water pollutant emission standards are released successively in Beijing, Tianjin, Zhejiang, Hebei and other places, and the emission limit value of main water pollutant indexes in various places standards reaches the III or IV water quality requirements (except total nitrogen) in the surface water environment quality standard (GB 3838-2002), so the standards are also called quasi-III or quasi-IV standards for short.
COD in each index is increased from 50-60 mg/L to 20-30 mg/L; the ammonia nitrogen is increased from 5-8 mg/L to 1.0-l.5mg/L; the TN is increased from 15mg/L to 10 mg/L; the total phosphorus is increased from 0.5-1.0 mg/L to 0.3mg/L, so the selection of the upgrading and transformation technology is important.
COD in secondary treatment effluent of a sewage treatment plant is about 10-60 mg/L, the B/C value is low, the biodegradability is poor, and soluble organic matters in the sewage are mostly non-degradable organic matters such as tannin, lignin, black humic acid and the like, so that the COD in the effluent can reach below 20mg/L by adopting an advanced treatment process combining biological treatment and physicochemical treatment. Ammonia nitrogen means NH or NH4 +The combined ammonia exists in a form, total nitrogen is the sum of organic nitrogen and inorganic nitrogen in water, the total nitrogen in raw water is mostly organic nitrogen and ammonia nitrogen, and the total nitrogen in water after secondary treatment is mostly nitrate nitrogen and ammonia nitrogen. An aerobic treatment unit (such as an aeration biological filter) is required to be added to the secondary effluent to achieve the aim of removing ammonia nitrogen. The denitrification needs to be enhanced aiming at the total nitrogen to enhance the denitrification effect. The secondary treatment unit mainly removes phosphorus through biology, the effect of the secondary treatment unit is influenced by various factors and is unstable, and a chemical phosphorus removal process needs to be added at the rear end. And finally, aiming at suspended matters, a filtering process or a strong coagulation effect is added.
Disclosure of Invention
The invention aims to provide a sewage advanced treatment process capable of meeting the quasi-IV water standard, and solves the technical problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a sewage advanced treatment process capable of meeting the quasi-IV type water standard comprises a composite denitrification biological tank, a high-efficiency sedimentation tank, a fiber rotary disc filter tank and an ozone catalytic oxidation tank, and comprises the following steps:
step S1: the effluent of the secondary sedimentation tank or the sewage treatment plant is conveyed into the composite denitrification biological tank through a pipeline for sewage treatment;
step S2: carrying out further degradation of COD, ammonia nitrogen and total nitrogen on the entering sewage in the composite denitrification biological tank through a carbon source adding and accurate control system and an aeration and backwashing fan;
step S3: after the COD, ammonia nitrogen and total nitrogen are degraded, conveying the primary treated sewage to a high-efficiency sedimentation tank through a pipeline for sewage treatment;
step S4: adding a phosphorus removing agent into the efficient sedimentation tank through a phosphorus removing agent adding device to carry out chemical phosphorus removal, and feeding the excess sludge into a sludge treatment unit for further treatment;
step S5: conveying the sewage subjected to secondary treatment to a fiber rotary disc filter tank through a pipeline for sewage treatment;
step S6: filtering in a fiber rotary disc filter to remove suspended matters in the fiber rotary disc filter, and conveying the sewage to an ozone catalytic oxidation tank through a pipeline for further treatment;
step S7: ozone generated by an ozone generator system in the ozone catalytic oxidation tank is put into the ozone catalytic oxidation tank, and strong oxidizing hydroxyl radicals generated by the ozone under the action of a catalyst thoroughly remove organic matters which are difficult to degrade or not biodegradable so as to ensure that the COD of the effluent is lower than 30mg/L or even 20 mg/L;
step S8: the water treated in the ozone catalytic oxidation tank is conveyed into a disinfection tank through a pipeline for disinfection treatment, and the disinfected water meets the discharge standard and is directly discharged or recycled.
Preferably, the composite denitrification biological tank is in an upward flow form, the control range of the ascending flow velocity is 5-10m/h, the composite denitrification biological tank mainly comprises a water distribution system, a gas backwashing system, biological fillers, a filler support, a water outlet channel, a backwashing wastewater drainage channel and a carbon source accurate feeding control system, and the tank body can be designed to run in a single tank or in parallel.
Preferably, the biological filler is a light suspended combined filler or a modified polyurethane-based functionalized carrier, and the filler support comprises a support beam and an interception net.
Preferably, the water distribution pipeline and the air pipeline system in the composite denitrification biological tank are both made of UPVC or ABS materials, the water distribution system of the composite denitrification biological tank adopts a one-pipe one-point type low-resistance water distribution system, the service area of each water distribution branch pipe is 4-9 square meters, the air pipeline is a perforated pipe, the bottom of each branch pipe is obliquely and 45 degrees downwards staggered and perforated, the aperture is phi 4mm, and the flow rate of the orifice during air backwashing is not more than 5 m/s.
Preferably, the carbon source accurate adding control system comprises a medicament-containing storage tank, a adding pump, an online monitoring instrument (a dissolved oxygen instrument, a flow meter and a nitrate nitrogen instrument) and a PLC control device.
Preferably, the high-efficiency sedimentation tank mainly comprises a rapid stirring area, a reaction area, a sedimentation area, a sludge concentration area and a sludge backflow and discharge system, wherein a phosphorus removing agent iron salt or aluminum salt is added into the rapid stirring area, the retention time is about 2min, a coagulant aid PAM is added into the reaction area, the retention time is about 20min, a counter-flow inclined tube is arranged in the sedimentation area, the surface load is 6-10m/h, floccule is deposited and concentrated at the lower part of the inclined tube into an upper layer and a lower layer, the upper layer is circulating sludge, and the lower layer is concentrated sludge.
Preferably, the fiber rotary disc filter chamber is composed of a plurality of rotary discs which are arranged in a rotary roller, filter cloth which can be conveniently detached is arranged on each rotary disc, the filter aperture of the filter cloth is usually selected to be 10um, and the filter speed range is 6-12 m/h.
Preferably, the ozone catalytic oxidation tank comprises an ozone generator, an ozone contact oxidation tank, a catalyst filler, a circulating pump and a high-efficiency catalytic feeding device.
Preferably, the ozone contact oxidation tank is formed by connecting three stages of reaction tanks in series, catalyst filler is filled in each stage, the filling height is 0.5-1 m, the catalyst filler is an aluminum oxide carrier surface sintering transition metal element, and ozone gas is added into each stage of reaction tank; and each stage of reaction tank is provided with a sewage circulating pump, the circulating pump absorbs water from the reaction tank, a water outlet is connected with a high-efficiency catalytic adding device, ozone gas is also connected into the high-efficiency catalytic adding device, the ozone gas and the water are mixed and dissolved in a Venturi ejector, the mixed water is uniformly distributed and added in the reaction tank through a secondary diffusion device, the ozone and a catalyst filler are in full contact reaction to generate hydroxyl radicals, the hydroxyl radicals further degrade organic pollutants in the sewage, and the ratio of the ozone adding amount to the COD removing amount can reach 1: 1.
Compared with the prior art, the invention has the following beneficial effects:
1. the combined process has high removal efficiency of COD, ammonia nitrogen, total phosphorus and suspended matters, stable performance, small occupied area and low operation cost, can ensure that the effluent index stably reaches the quasi IV-class water standard, and can ensure that the effluent index reaches the quasi III-class standard on the premise of increasing the dosage of various medicaments and ozone and improving the operation cost.
2. The composite denitrification biological tank in the combined process can realize the removal of ammonia nitrogen and COD or total nitrogen respectively, can also realize the synchronous removal of COD, ammonia nitrogen and total nitrogen, and has high removal rate; when the carbon source is sufficient, the total nitrogen of the effluent can be ensured to be lower than 3 mg/L; the nitrification efficiency is high in the aerobic environment, and the ammonia nitrogen in the effluent can reach the undetected standard; under the facultative environment, the synchronous removal function of ammonia nitrogen and total nitrogen can be realized, and higher removal rate is kept; meanwhile, the biological filler has the characteristics of large specific surface area, high porosity, small head loss, less residual sludge, no need of water washing, simple operation management and the like, and the adding amount of the carbon source can be controlled by a carbon source accurate adding control system according to various indexes of inlet and outlet water, so that the operation cost is reduced.
3. The efficient sedimentation tank integrates the functions of coagulation, sedimentation and concentration, has a compact structure, reduces the civil engineering cost and saves the construction land; can high-efficiently get rid of total phosphorus and suspended solid, have that treatment effeciency is high, the unit area water yield is big, strong adaptability, the shock resistance load is strong, treatment effect is stable etc. and area advantage such as little, be particularly useful for old sewage treatment plant to carry the standard transformation project.
4. The filter unit of the invention selects the fiber rotary disc filter pool, can remove suspended matters which can be less than 5mg/L, and has the characteristics of stable effluent quality, low investment, small floor area, high operation automation degree, low operation cost and the like.
5. The ozone catalytic oxidation unit can efficiently remove COD, can be used as a tail end closing process, and has a disinfection function; under the comprehensive action of the catalyst and the high-efficiency catalytic adding device, the utilization rate of ozone is high, and the adding amount and the operating cost of the ozone can be reduced; the ozone contact tank adopts three-stage series connection, and the mode of ozone multistage addition can guarantee that the COD has higher clearance when improving the ozone utilization ratio.
6. In the combined process, the composite denitrification biological tank has the function of intercepting suspended matters by the biological filler, and the high-efficiency sedimentation tank can also remove the suspended matters, so that the water inlet quality of the fiber rotary disc filter tank is improved, and the water outlet quality is improved while the backwashing period of the fiber rotary disc filter tank is prolonged.
7. The ozone catalytic oxidation unit is arranged behind the fiber turntable filtering unit, the water inlet suspended matter is low, and the ozone utilization rate is high.
8. The process flow has low head loss of each unit from front to back, and can adopt gravity inflow, thereby reducing the middle lifting unit and lowering the operation cost.
9. The surpassing pipeline can be arranged between the fiber rotary disc filter tank and the disinfection tank, and can surpass the ozone catalytic oxidation tank under the condition that the COD of the outlet water can reach the standard, so as to reduce the operation cost.
10. The efficient sedimentation tank and the fiber rotary disc filter tank in the combined process are common processes of sewage treatment plants, so that the old waste can be used in combination with the current situation of the sewage treatment plant in the upgrading and modifying project, and the investment cost is reduced. Meanwhile, by combining different discharge standard requirements and the current situation of a sewage plant, the high-efficiency sedimentation tank can be replaced by a magnetic coagulation tank sedimentation tank, and the fiber rotary disc filter tank can be replaced by a V-shaped filter tank and other sand filter tanks or omitted.
11. The combined process has strong coupling capacity among the units, all the units can be jointly built to save occupied land when land used in reconstruction projects is short, and the combined process technology has wide application prospect in upgrading reconstruction and advanced treatment of sewage treatment plants under the condition that the urban land is increasingly short
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution for advanced wastewater treatment that can meet the quasi-iv water standard: a sewage advanced treatment process capable of meeting the quasi-IV type water standard comprises a composite denitrification biological tank, a high-efficiency sedimentation tank, a fiber rotary disc filter tank and an ozone catalytic oxidation tank, and comprises the following steps:
step S1: the effluent of the secondary sedimentation tank or the sewage treatment plant is conveyed into the composite denitrification biological tank through a pipeline for sewage treatment;
step S2: carrying out further degradation of COD, ammonia nitrogen and total nitrogen on the entering sewage in the composite denitrification biological tank through a carbon source adding and accurate control system and an aeration and backwashing fan;
step S3: after the COD, ammonia nitrogen and total nitrogen are degraded, conveying the primary treated sewage to a high-efficiency sedimentation tank through a pipeline for sewage treatment;
step S4: adding a phosphorus removing agent into the efficient sedimentation tank through a phosphorus removing agent adding device to carry out chemical phosphorus removal, and feeding the excess sludge into a sludge treatment unit for further treatment;
step S5: conveying the sewage subjected to secondary treatment to a fiber rotary disc filter tank through a pipeline for sewage treatment;
step S6: filtering in a fiber rotary disc filter to remove suspended matters in the fiber rotary disc filter, and conveying the sewage to an ozone catalytic oxidation tank through a pipeline for further treatment;
step S7: ozone generated by an ozone generator system in the ozone catalytic oxidation tank is put into the ozone catalytic oxidation tank, and strong oxidizing hydroxyl radicals generated by the ozone under the action of a catalyst thoroughly remove organic matters which are difficult to degrade or not biodegradable so as to ensure that the COD of the effluent is lower than 30mg/L or even 20 mg/L;
step S8: the water treated in the ozone catalytic oxidation tank is conveyed into a disinfection tank through a pipeline for disinfection treatment, and the disinfected water meets the discharge standard and is directly discharged or recycled.
Furthermore, the composite denitrification biological tank can be respectively used as an aeration biological tank for removing COD and ammonia nitrogen, a denitrification biological tank for removing total nitrogen or a synchronous nitrification and denitrification biological tank for simultaneously removing COD, ammonia nitrogen and total nitrogen, the operation mode is flexible, and the operation can be switched under three working conditions; the composite denitrification biological pool is in an upward flow mode, the control range of the ascending flow velocity is 5-10m/h, the composite denitrification biological pool mainly comprises a water distribution system, a gas backwashing system, biological fillers, a filler bracket, a water outlet channel, a backwashing wastewater drainage channel and a carbon source accurate feeding control system, and the pool body can be designed to run in a single pool or a plurality of pools in parallel.
Furthermore, the biological filler is a light suspended combined filler or a modified polyurethane-based functional carrier, and the filler support comprises a support beam and an interception net.
Furthermore, the water distribution pipeline and the air pipeline system in the composite denitrification biological tank are both made of UPVC or ABS materials, the water distribution system of the composite denitrification biological tank adopts a one-pipe one-point type low-resistance water distribution system, the service area of each water distribution branch pipe is 4-9 square meters, the air pipeline is a perforated pipe, the bottom of each branch pipe is obliquely and 45 degrees downwards staggered and perforated, the aperture is phi 4mm, and the flow rate of the orifice during air backwashing is not more than 5 m/s.
Furthermore, the accurate carbon source adding control system comprises a medicament-containing storage tank, an adding pump, an online monitoring instrument (a dissolved oxygen instrument, a flow meter and a nitrate nitrogen instrument) and a PLC control device.
Further, the main functions of the high-efficiency sedimentation tank are chemical phosphorus removal and suspended matter removal; the efficient sedimentation tank mainly comprises a rapid stirring area, a reaction area, a sedimentation area, a sludge concentration area and a sludge backflow and discharge system, wherein a phosphorus removing agent iron salt or aluminum salt is added into the rapid stirring area, the retention time is about 2min, a coagulant aid PAM is added into the reaction area, the retention time is about 20min, a counter-current inclined tube is arranged in the sedimentation area, the surface load is 6-10m/h, floccules are deposited and concentrated at the lower part of the inclined tube into an upper layer and a lower layer, the upper layer is circulating sludge, and the lower layer is concentrated sludge.
Furthermore, the fiber rotary disc filter chamber is composed of a plurality of rotary discs which are arranged in a rotary roller, filter cloth which can be conveniently disassembled is arranged on the rotary discs, the filter aperture of the filter cloth is usually selected to be 10um, and the filter speed range is 6-12 m/h; the rotary discs arranged on the fiber rotary disc filter chamber can determine the number of the rotary discs on site according to the actual process requirements.
Furthermore, the ozone catalytic oxidation technology is an efficient sewage advanced treatment technology, is a research hotspot in the field of industrial sewage treatment and municipal domestic sewage upgrading and transformation in recent years, and achieves water quality purification by utilizing a large amount of strong-oxidizing hydroxyl radicals generated in the ozone reaction process to oxidize and decompose organic matters in water; the ozone catalytic oxidation system comprises an ozone generator, an ozone contact oxidation tank, a catalyst filler, a circulating pump and a high-efficiency catalytic adding device.
Further, the ozone contact oxidation tank is formed by connecting three stages of reaction tanks in series, catalyst filler is filled in each stage, the filling height is 0.5-1 m, the catalyst filler is an aluminum oxide carrier surface sintering transition metal element, and ozone gas is added into each stage of reaction tank; and each stage of reaction tank is provided with a sewage circulating pump, the circulating pump absorbs water from the reaction tank, a water outlet is connected with a high-efficiency catalytic adding device, ozone gas is also connected into the high-efficiency catalytic adding device, the ozone gas and the water are mixed and dissolved in a Venturi ejector, the mixed water is uniformly distributed and added in the reaction tank through a secondary diffusion device, the ozone and a catalyst filler are in full contact reaction to generate hydroxyl radicals, the hydroxyl radicals further degrade organic pollutants in the sewage, and the ratio of the ozone adding amount to the COD removing amount can reach 1: 1.
Cite embodiment one:
the invention is used for upgrading and transforming a certain sewage treatment plant, the designed water inlet index is the first grade A standard of the national standard of discharge Standard of pollutants for municipal wastewater treatment plant (GB18918-2002), and simultaneously, the invention contains part of concentrated water of the sewage recycling reverse osmosis device, and the designed discharge standard is the discharge standard of a certain place (the main indexes are that COD is less than or equal to 30mg/L, BOD5Less than or equal to 6mg/L, and less than or equal to ammonia nitrogen1.5mg/L, TN less than or equal to 10mg/L and total phosphorus less than or equal to 0.3mg/L), and the adopted main treatment process flow is the process method and the combination of the invention.
The specific process flow is that national standard first-level A discharge water firstly enters a fully-buried regulating reservoir, sewage in the regulating reservoir firstly enters a denitrification zone of a composite denitrification biological reservoir for denitrification to remove total nitrogen by lifting through a pump, an organic carbon source is added on a denitrification water inlet pipeline, the hydraulic retention time of the denitrification zone is about 55min, effluent of the denitrification zone enters an aerobic aeration zone, the retention time of the aerobic aeration zone is about 3h, COD and ammonia nitrogen are further degraded, and the ammonia nitrogen in effluent of the process unit is ensured to directly reach the discharge index requirement. Then sequentially entering a high-efficiency sedimentation tank, a fiber rotary disc filter tank and an ozone catalytic oxidation tank, and arranging a primary pump lifting device before entering the ozone catalytic oxidation tank; all structures in this example are steel concrete structures.
In the example, the stable operation of the sewage plant for nearly two years proves the stability and reliability of the application of the process in the upgrading and transformation of the sewage plant, the effluent of the denitrification zone can be lower than 3mg/L under the condition of sufficient carbon source, the COD of the effluent can be lower than 30mg/L when the effluent of the aerobic aeration zone is free of RO concentrated water in the influent, the ammonia nitrogen is lower than 0.5mg/L and even is not detected, and the total nitrogen in the aerobic aeration zone can be reduced to 3mg/L under the condition of controlling dissolved oxygen; the TP of the effluent of the high-efficiency sedimentation tank and the fiber rotary disc filter is less than 0.3mg/L, and the suspended matter is less than 6 mg/L. When pure municipal sewage is treated and RO concentrated water is not contained, the ozone catalytic oxidation device at the tail end does not operate normally, and COD of the ozone catalytic oxidation device can meet the requirement of a discharge standard, so that the effluent of the fiber rotary disc filter tank can directly surpass the final end disinfection setting. The operation result of the invention proves that the invention can completely meet the standard requirement of surface quasi IV water and the operation effect is stable and reliable.
Cite example two:
the invention is applied to the sewage emergency treatment device of a certain coastal urban pump station, the sewage of the pump station is mainly domestic sewage and contains partial rainwater, and the designed water inlet index is that COD is less than or equal to 300mg/L and BOD5Less than or equal to 150mg/L, ammonia nitrogen less than or equal to 30mg/L, TN less than or equal to 40mg/L, total phosphorus less than or equal to 4mg/L, wherein the designed discharge standard is a local discharge standard (the main indexes are COD less than or equal to 40mg/L and BOD5The process flow is that sewage in a collecting tank of a station → a rotational flow grit chamber → a composite denitrification biological tank → an intermediate tank → a magnetic coagulation sedimentation tank → an ozone catalytic oxidation tank.
The specific process flow is that the sewage of a pump station is lifted by a pump and firstly enters a rotational flow grit chamber and then enters a denitrification biological tank, wherein a denitrification area of the composite denitrification biological tank is subjected to denitrification to remove total nitrogen, an organic carbon source is added at the water inlet end of the denitrification area, the hydraulic retention time of the denitrification area is about 3 hours, the effluent of the denitrification area enters an aerobic aeration area, the retention time of the aerobic aeration area is about 5 hours, COD and ammonia nitrogen are further degraded, the effluent of the process unit enters an intermediate water tank, the intermediate water tank is provided with a sewage lifting pump and a nitrification liquid reflux pump, and the ammonia nitrogen directly reaches the requirement of a discharge index. Then the wastewater enters an ozone catalytic oxidation tank to degrade COD. All structures in the example are steel structure integrated equipment.
After the process is operated for more than one year, the effluent quality can stably meet the requirement of the discharge standard, which proves that the process can be used for the standard improvement and the reconstruction of sewage treatment plants in municipal and industrial parks, can also be used for the treatment of municipal domestic sewage with relatively low concentration, and ensures that the effluent meets the standard requirement of surface standard IV water
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The advanced sewage treatment process capable of meeting the quasi-IV water standards comprises a composite denitrification biological tank, a high-efficiency sedimentation tank, a fiber rotary disc filter tank and an ozone catalytic oxidation tank, and is characterized in that: the method comprises the following steps:
step S1: the effluent of the secondary sedimentation tank or the sewage treatment plant is conveyed into the composite denitrification biological tank through a pipeline for sewage treatment;
step S2: carrying out further degradation of COD, ammonia nitrogen and total nitrogen on the entering sewage in the composite denitrification biological tank through a carbon source adding and accurate control system and an aeration and backwashing fan;
step S3: after the COD, ammonia nitrogen and total nitrogen are degraded, conveying the primary treated sewage to a high-efficiency sedimentation tank through a pipeline for sewage treatment;
step S4: adding a phosphorus removing agent into the efficient sedimentation tank through a phosphorus removing agent adding device to carry out chemical phosphorus removal, and feeding the excess sludge into a sludge treatment unit for further treatment;
step S5: conveying the sewage subjected to secondary treatment to a fiber rotary disc filter tank through a pipeline for sewage treatment;
step S6: filtering in a fiber rotary disc filter to remove suspended matters in the fiber rotary disc filter, and conveying the sewage to an ozone catalytic oxidation tank through a pipeline for further treatment;
step S7: ozone generated by an ozone generator system in the ozone catalytic oxidation tank is put into the ozone catalytic oxidation tank, and strong oxidizing hydroxyl radicals generated by the ozone under the action of a catalyst thoroughly remove organic matters which are difficult to degrade or not biodegradable so as to ensure that the COD of the effluent is lower than 30mg/L or even 20 mg/L;
step S8: the water treated in the ozone catalytic oxidation tank is conveyed into a disinfection tank through a pipeline for disinfection treatment, and the disinfected water meets the discharge standard and is directly discharged or recycled.
2. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 1, which is characterized in that: the composite denitrification biological pool is in an upward flow mode, the control range of the ascending flow velocity is 5-10m/h, the composite denitrification biological pool mainly comprises a water distribution system, a gas backwashing system, biological fillers, a filler support, a water outlet channel, a backwashing wastewater drainage channel and a carbon source accurate feeding control system, and the pool body can be designed to run in a single pool or a plurality of pools in parallel.
3. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 2, which is characterized in that: the biological filler is a light suspended combined filler or a modified polyurethane-based functionalized carrier, and the filler support comprises a support beam and an interception net.
4. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 1, which is characterized in that: the water distribution pipeline and the air pipeline system in the composite denitrification biological tank are both made of UPVC or ABS materials, the water distribution system of the composite denitrification biological tank adopts a one-pipe one-point type low-resistance water distribution system, the service area of each water distribution branch pipe is 4-9 square meters, the air pipeline is a perforated pipe, the bottom of each branch pipe is obliquely provided with 45-degree downward staggered holes, the hole diameter is phi 4mm, and the flow speed of the hole opening during air backwashing is not more than 5 m/s.
5. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 1, which is characterized in that: the accurate carbon source adding control system comprises a medicament-containing storage tank, an adding pump, an online monitoring instrument and a PLC control device.
6. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 1, which is characterized in that: the efficient sedimentation tank mainly comprises a rapid stirring area, a reaction area, a sedimentation area, a sludge concentration area and a sludge backflow and discharge system, wherein a phosphorus removing agent iron salt or aluminum salt is added into the rapid stirring area, the retention time is about 2min, a coagulant aid PAM is added into the reaction area, the retention time is about 20min, a counter-current inclined tube is arranged in the sedimentation area, the surface load is 6-10m/h, floccule is deposited and concentrated at the lower part of the inclined tube into an upper layer and a lower layer, the upper layer is circulating sludge, and the lower layer is concentrated sludge.
7. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 1, which is characterized in that: the fiber rotary disc filter tank is composed of a plurality of rotary discs which are arranged in a rotary roller, filter cloth which can be conveniently detached is arranged on each rotary disc, the filter aperture of the filter cloth is usually selected to be 10 mu m, and the filter speed range is 6-12 m/h.
8. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 1, which is characterized in that: the ozone catalytic oxidation tank comprises an ozone generator, an ozone contact oxidation tank, a catalyst filler, a circulating pump and a high-efficiency catalytic feeding device.
9. The advanced wastewater treatment process capable of meeting the quasi-IV-class water standard according to claim 8, which is characterized in that: the ozone contact oxidation tank is formed by connecting three stages of reaction tanks in series, catalyst filler is filled in each stage, the filling height is 0.5-1 m, the catalyst filler is aluminum oxide carrier surface sintering transition metal elements, and ozone gas is added into each stage of reaction tank; and each stage of reaction tank is provided with a sewage circulating pump, the circulating pump absorbs water from the reaction tank, a water outlet is connected with a high-efficiency catalytic adding device, ozone gas is also connected into the high-efficiency catalytic adding device, the ozone gas and the water are mixed and dissolved in a Venturi ejector, the mixed water is uniformly distributed and added in the reaction tank through a secondary diffusion device, the ozone and a catalyst filler are in full contact reaction to generate hydroxyl radicals, the hydroxyl radicals further degrade organic pollutants in the sewage, and the ratio of the ozone adding amount to the COD removing amount can reach 1: 1.
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Application publication date: 20210910 |