CN112960859A - Sewage treatment system and method for upgrading and transforming urban sewage plant - Google Patents
Sewage treatment system and method for upgrading and transforming urban sewage plant 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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F1/28—Treatment of water, waste water, or sewage by sorption
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—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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- 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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- 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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- 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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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention provides a sewage treatment system and a method for upgrading and transforming a town sewage plant, wherein the sewage treatment system comprises a primary treatment unit, a secondary biochemical treatment unit, a deep treatment unit and a sludge treatment unit which are sequentially connected; the secondary biochemical treatment unit adopts a multi-stage AO treatment system and comprises an anaerobic tank, an anoxic tank I, an aerobic tank I, an anoxic tank II and an aerobic tank II which are connected in sequence; the secondary biochemical treatment unit also comprises a pre-anoxic tank which is arranged in front of the anaerobic tank and is used for performing anaerobic ammonium oxidation biological denitrification on the effluent of the primary treatment unit; the water outlet of the primary treatment unit is respectively connected with the water inlets of at least two of the pre-anoxic tank, the anoxic tank I and the anoxic tank II in the secondary biochemical treatment unit, so that the sewage from the primary treatment unit provides a carbon source for denitrification. The sewage treatment system and the method provided by the invention can save carbon source addition, save floor area and ensure that the nitrogen and phosphorus content of the effluent water stably reaches the standard.
Description
Technical Field
The invention relates to the technical field of sewage treatment and environmental protection, in particular to a sewage treatment system and method for upgrading and transforming a town sewage plant.
Background
Along with the economic development of China, the urbanization degree is improved, and the generation amount of urban sewage is increased year by year. However, the first class A and the first class B in the current urban sewage plant discharge standard 18918 in China still aim at the inferior five types of standards of surface water, and after the sewage is discharged into natural water, water pollution is caused from point to surface, from cities to rural areas and from the surface to the underground, so that the sewage becomes one of the more serious inducements of water environment problems. Therefore, the upgrading and reconstruction work of the municipal sewage treatment plant becomes important in the sewage treatment industry in China.
The municipal sewage treatment in China mainly comprises secondary biological treatment, the secondary biological treatment process can well remove organic matters in water, but the removal rate of elements such as nitrogen, phosphorus and the like in water is low, and TN and TP of effluent are often out of standard. Aiming at the condition that TN exceeds standard, denitrification reaction is carried out in an anoxic environment under the condition that a carbon source is sufficient to realize denitrification. However, most urban sewage plants are often lack of carbon sources, and denitrification is performed by adding additional carbon sources, so that the method has the risks of large adding amount, high cost and excessive COD (chemical oxygen demand) of effluent water. Aiming at the problem of over standard of total phosphorus, a method of adding a chemical phosphorus removal agent into sewage and reacting the chemical phosphorus removal agent with phosphorus to generate a precipitate is generally adopted. The phosphorus removing agent is usually added in front of a primary sedimentation tank, in front of a secondary sedimentation tank or at the effluent of secondary biochemical treatment, when the phosphorus removing agent is added at the effluent of the secondary biochemical treatment, advanced treatment processes such as coagulation, precipitation, filtration and the like are necessary and later set so as to remove insoluble phosphate formed by the reaction of sewage and the phosphorus removing agent from the sewage, and simultaneously remove SS and organic pollutants with incomplete precipitation, so that indexes such as COD, SS, ammonia nitrogen, total phosphorus and the like in the effluent can be effectively ensured to reach the standard. The biggest disadvantage of the traditional coagulation, sedimentation and filtration (common filter tank) process is large floor space, and the development of available space for a transformed sewage plant has a great challenge.
Consequently, to nitrogen phosphorus problem, reform transform current sewage plant's focus in: the carbon source adding is saved, the occupied area is saved, and the stable standard of the nitrogen and phosphorus content of the effluent water is ensured.
Aiming at the three items, the technical means and the route which need to be adopted are as follows: the development and the efficient utilization of the internal carbon source are realized, the improved and optimized process is adopted, and the final purpose is to fully excavate the nitrogen and phosphorus removal potential of secondary biological treatment and realize stable operation.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a sewage treatment system and a method for upgrading and transforming a town sewage plant, the treatment system is obtained by transforming the existing town sewage plant, so that the addition of a carbon source is saved, the occupied area is saved, and the stable standard of the nitrogen and phosphorus contents of effluent water is ensured.
In order to achieve at least the above purposes, the invention adopts the following technical scheme:
a sewage treatment system for upgrading and transforming a town sewage plant comprises a primary treatment unit, a secondary biochemical treatment unit, an advanced treatment unit and a sludge treatment unit which are connected in sequence; the secondary biochemical treatment unit adopts a multi-stage AO treatment system, and the multi-stage AO treatment system comprises an anaerobic tank, an anoxic tank I, an aerobic tank I, an anoxic tank II and an aerobic tank II which are connected in sequence; the secondary biochemical treatment unit also comprises a pre-anoxic tank arranged in front of the anaerobic tank and used for performing anaerobic ammonia oxidation biological denitrification on the effluent of the primary treatment unit.
As a preferred embodiment, the water outlet of the primary treatment unit is respectively connected with the water inlets of at least two of the pre-anoxic tank, the anoxic tank I and the anoxic tank II in the secondary biochemical treatment unit, so that the sewage from the primary treatment unit provides a carbon source for denitrification.
As a preferred embodiment, the primary treatment unit includes a coarse grid, a fine grid, a grit chamber, and a primary settling chamber, which are connected in sequence according to the water flow direction.
Above-mentioned sewage treatment system, as an preferred embodiment, the water inlet in advance the oxygen deficiency pond with the delivery port of the preliminary sedimentation pond in the primary treatment unit links to each other, the delivery port in advance the oxygen deficiency pond with the water inlet in anaerobism pond links to each other, is used for right the play water of primary treatment unit carries out anaerobic ammonium oxidation biological denitrification, provides optimal condition for the organic matter hydrolysis reaction that goes on in the anaerobism section in the secondary biochemical treatment unit, makes the denitrification process in the anaerobism pond go on thoroughly, improves denitrogenation efficiency.
In the sewage treatment system, as a preferred embodiment, in the secondary biochemical treatment unit, a suspended carrier is added into the aerobic tank I and the aerobic tank II to form an MBBR sludge membrane composite system, so that the fixed enrichment and continuous retention of nitrifying floras are realized, the sludge growth age required by the nitrifying floras is ensured, the sludge age in a suspended state can be reduced to a certain extent, the biological phosphorus removal is enhanced, and particularly, the removal effect on soluble TP is achieved.
The invention adopts multi-stage AO treatment units, namely an anaerobic tank, an anoxic tank I, an MBBR aerobic tank I, an anoxic tank II and an MBBR aerobic tank II, to degrade organic pollutants, and reduces the energy consumption of internal reflux compared with the traditional internal reflux denitrification process.
In the above sewage treatment system, as a preferred embodiment, the secondary biochemical treatment unit is further provided with a denitrification filter tank, a coagulation sedimentation tank and a secondary sedimentation tank in sequence after the aerobic tank II; preferably, the denitrification filter tank is a denitrification deep bed filter tank.
As an optimal implementation manner, the water inlet of the pre-anoxic tank is further connected with the sludge return outlet of the secondary sedimentation tank, and is used for receiving a part of sludge after mud-water separation of the secondary sedimentation tank to return to the pre-anoxic tank, and the pre-anoxic tank removes organic matters in wastewater under the action of activated sludge, so that denitrification capacity is enhanced.
In the invention, the secondary biochemical treatment unit is provided with the pre-anoxic tank, and part of raw water and return sludge of the secondary sedimentation tank are introduced into the pre-anoxic tank to carry out the biological denitrification of the anaerobic ammonia oxidation so as to strengthen the denitrification capability of the system. Meanwhile, nitrate in the returned sludge can be effectively removed through anaerobic ammoxidation in the pre-anoxic tank, low-concentration nitrate in the inlet water of the anaerobic tank is ensured, the phosphorus release efficiency of the anaerobic tank is improved, and the phosphorus removal effect is enhanced.
Because the denitrification efficiency of the multi-stage AO treatment system in the secondary biochemical treatment unit is higher, the denitrification filter tank does not need to consider a large amount of TN removal in the design, and only considers the situation under extreme conditions, thereby further reducing the occupied area.
In the above sewage treatment system, as a preferred embodiment, in the secondary biochemical treatment unit, the coagulation sedimentation tank adopts a high-efficiency coagulation sedimentation tank to further remove phosphorus and soluble SS.
In the above sewage treatment system, as a preferred embodiment, the advanced treatment unit comprises an ozone oxidation device, an activated carbon adsorption device and a fiber filter which are connected in sequence.
In the invention, the advanced treatment unit adopts an ozone oxidation and activated carbon adsorption process to further remove organic matters which are difficult to biodegrade in the wastewater and decolor the wastewater.
In the above sewage treatment system, as a preferred embodiment, the ozone oxidation device includes an ozone catalytic oxidation tower, an ozone generator for supplying ozone to the ozone catalytic oxidation tower, and an ozone tail gas destructor. Wherein, the ozone generator adopts an oxygen source, and oxygen is supplied by the liquid oxygen station.
In the sewage treatment system, as a preferred embodiment, the ozone tail gas destructor is used for treating the ozone tail gas generated by the ozone catalytic oxidation tower so as to enable the ozone tail gas to reach the safe emission standard.
In the above sewage treatment system, as a preferred embodiment, in the advanced treatment unit, a disinfection tank and a clean water tank are connected in sequence after the fiber filter tank.
In the above sewage treatment system, as a preferred embodiment, the disinfection tank is used for disinfecting the effluent filtered by the fiber filter tank, and preferably, the disinfection tank is disinfected by ozone. The invention considers disinfection and advanced treatment as a whole, and reduces the investment cost of the system.
The invention also provides a sewage treatment method for upgrading and transforming the urban sewage plant by adopting the sewage treatment system, which adopts the following technical scheme:
a sewage treatment method for upgrading and transforming urban sewage plants by adopting the sewage treatment system comprises the following steps: primary treatment, secondary biochemical treatment, advanced treatment and sludge treatment; wherein,
the secondary biochemical treatment step sequentially comprises pre-anoxic treatment, anaerobic treatment, I-section anoxic treatment, I-section aerobic treatment, II-section anoxic treatment and II-section aerobic treatment;
the sewage after the primary treatment is respectively fed into a pre-anoxic tank, an anoxic tank I and an anoxic tank II according to a proportion, the sewage after the primary treatment directly provides a carbon source for denitrification reaction, the residual carbon pollutants are removed in an aerobic section, and ammonia nitrogen is oxidized into nitrate nitrogen in the aerobic section to be fed into the anoxic section for treatment.
In the above sewage treatment method, as a preferred embodiment, the secondary biochemical treatment step further includes denitrification treatment, high-efficiency coagulating sedimentation treatment and secondary sedimentation treatment in sequence after the second-stage aerobic treatment.
In the above-mentioned sewage treatment method, as a preferred embodiment, in the secondary biochemical treatment step, the effluent of the primary treatment and the return sludge of the secondary sedimentation tank are introduced into the pre-anoxic tank for anaerobic ammonia oxidation biological denitrification to enhance the denitrification capability of the system.
In the above sewage treatment method, as a preferred embodiment, in the secondary biochemical treatment step, in the stage I aerobic treatment and the stage II aerobic treatment step, suspended carriers are added into the aerobic tank I and the aerobic tank II to form an MBBR sludge membrane composite system.
In the above sewage treatment method, as a preferred embodiment, the primary treatment sequentially includes a coarse grid treatment, a fine grid treatment, a sand setting treatment, and a primary setting treatment.
In the above sewage treatment method, as a preferred embodiment, the advanced treatment step includes an ozone oxidation treatment, an activated carbon adsorption treatment, a fiber filtration treatment and a disinfection treatment in this order.
In the above sewage treatment method, as a preferred embodiment, in the ozone oxidation treatment step, an ozone generator is used to provide an ozone source to perform oxidation treatment on the secondary biochemical treatment effluent, so as to further degrade organic pollutants which are difficult to be biodegraded in the wastewater; after being collected by a pipeline, the ozone tail gas is safely discharged after being treated by the ozone tail gas destructor, so that secondary pollution caused by the ozone tail gas is avoided; preferably, the ozone generator employs a source of oxygen, which is supplied from a liquid oxygen station.
In the above-described sewage treatment method, as a preferred embodiment, the activated carbon adsorption treatment step further removes organic substances in the wastewater to decolor the wastewater by performing activated carbon adsorption treatment on the effluent after the ozone oxidation treatment.
In the above sewage treatment method, as a preferred embodiment, in the fiber filtration treatment step, the sewage after the activated carbon adsorption treatment is subjected to filtration treatment, and the long fibers made of the organic molecular material are used as a filter material to intercept suspended matters in the wastewater, thereby further improving the quality of the effluent.
In the above sewage treatment method, as a preferred embodiment, in the step of disinfection treatment, ozone is used to disinfect the effluent after fiber filtration, and the effluent after disinfection treatment enters a clean water tank to be stored or discharged after reaching standards.
In the above sewage treatment method, as a preferred embodiment, the sludge treatment step sequentially includes sludge concentration, sludge storage, dehydration drying and reuse; wherein in the sludge concentration treatment, the sludge obtained from the high-efficiency coagulating sedimentation treatment, the secondary sedimentation treatment and the active carbon adsorption treatment is concentrated.
In the present invention, the above technical features can be combined with each other to form a new technical solution without conflicting with each other.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the sewage treatment system provided by the invention adds a front-section pre-anoxic biological reaction zone in the secondary biochemical treatment unit, provides an optimal condition for the hydrolysis reaction of organic matters in the anaerobic section, has a thorough denitrification process and improves the denitrification efficiency;
secondly, a water inlet mode of sectional water inlet is adopted, the carbon source for denitrification comes from water inlet, the C source in the raw water is fully utilized, and the additional carbon source is obviously saved;
thirdly, biological nitrogen and phosphorus removal is carried out by adopting a multi-stage AO treatment system, organic pollutants are degraded, and compared with the traditional internal reflux denitrification process, the reaction efficiency is improved, and the energy consumption of internal reflux is reduced;
the aerobic section is provided with the suspension filler, so that the volume load of the aerobic section is improved, the fixed enrichment of nitrifying bacteria groups is realized, and the sludge growth age required by the nitrifying bacteria groups is ensured, so that the sludge age in a suspended state can be reduced to a certain extent, the biological phosphorus removal is enhanced, and particularly, the removal effect on soluble TP is realized;
and fifthly, selecting an ozone oxidation and activated carbon adsorption process in the advanced treatment section to further degrade, adsorb and remove pollutants in the raw water and ensure that the quality of the effluent stably meets the water quality requirements of surface four types of water bodies.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only references to some embodiments in this application document, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts, and some parts of them can be used after adjustment.
Fig. 1 shows a process flow diagram of a system for upgrading and transforming a town sewage plant in an embodiment of the invention. Wherein, 1 is thick grid, 2 is thin grid, 3 is the grit chamber, 4 is just sinking the pond, 5 is the oxygen deficiency pond in advance, 6 is the anaerobism pond, 7 is oxygen deficiency pond I, 8 is good oxygen pond I, 9 is oxygen deficiency pond II, 10 is good oxygen pond II, 11 is the denitrification filtering pond, 12 is the coagulating sedimentation tank, 13 is two sinking ponds, 14 is ozone oxidation device, 15 is active carbon adsorption device, 16 is the fibre filtering pond, 17 is the disinfection pond, 18 is the clean water basin, 19 is the concentrated pond of mud, 20 is the mud reservoir, 21 is the dehydration computer lab.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail with reference to the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto, and the described examples are only a part of examples of the present invention, but not all examples. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
Referring to fig. 1, the specific embodiment of the present invention provides a sewage treatment system for upgrading and transforming a town sewage plant, which comprises a primary treatment unit, a secondary biochemical treatment unit, an advanced treatment unit and a sludge treatment unit, which are connected in sequence; the secondary biochemical treatment unit adopts a multi-stage AO treatment system, and the multi-stage AO treatment system comprises an anaerobic tank 6, an anoxic tank I7, an aerobic tank I8, an anoxic tank II 9 and an aerobic tank II 10 which are connected in sequence. The secondary biochemical treatment unit also comprises a pre-anoxic tank 5 which is arranged in front of the anaerobic tank 6 and is used for carrying out anaerobic ammonia oxidation biological denitrification on the effluent of the primary treatment unit. The details of the respective components and devices included in the sewage treatment system of the present invention will be described below.
A primary processing unit: according to the water flow direction, the device comprises a coarse grating 1, a fine grating 2, a grit chamber 3 and a primary settling chamber 4 which are connected in sequence. Wherein, the coarse grid 1-the fine grid 2-the grit chamber 3 "is used for removing large suspended matters and inorganic particles; the primary sedimentation tank 4 is used for removing settleable matters and floating matters in the wastewater.
A secondary biochemical treatment unit: is connected with the primary treatment unit and is used for carrying out secondary biochemical treatment on the sewage after the primary treatment. The secondary biochemical treatment unit comprises a pre-anoxic tank 5, an anaerobic tank 6, an anoxic tank I7, an aerobic tank I8, an anoxic tank II 9, an aerobic tank II 10, a denitrification filter tank 11, a coagulation sedimentation tank 12 and a secondary sedimentation tank 13 which are connected in sequence.
In one embodiment of the invention, the water outlet of the primary treatment unit is respectively connected with the water inlets of at least two of the pre-anoxic tank 5, the anoxic tank I7 and the anoxic tank II 9 in the secondary biochemical treatment unit, and is used for providing a carbon source for denitrification by using raw water, namely sewage from the primary treatment unit.
Further, the pre-anoxic tank 5: the pre-anoxic tank 5 is arranged at the front section of the secondary biochemical treatment unit, is connected with an outlet of the primary sedimentation tank 4 in the primary treatment unit and is used for carrying out anaerobic ammonia oxidation biological denitrification on the effluent of the primary treatment unit.
Further, a water inlet of the anoxic tank I7 is connected with a water outlet of the primary sedimentation tank 4, and the anoxic tank I7 is used for taking a carbon source in the raw town sewage (namely primary treatment effluent) treated by the primary sedimentation tank 4 as a carbon source for denitrification reaction in the anoxic tank I7, so that an external carbon source is saved.
Further, the water inlet of the anoxic tank II 9 is connected with the water outlet of the primary sedimentation tank 4, and is used for taking a carbon source in the raw town sewage (i.e. primary treatment effluent) treated by the primary sedimentation tank 4 as a carbon source for denitrification reaction in the anoxic tank II 9, so that an additional carbon source is saved.
In the invention, a water inlet mode of sectional water inlet is adopted, the carbon source for denitrification comes from the inlet water, the carbon source in the raw water is fully utilized, and the additional carbon source is obviously saved.
In one embodiment of the invention, the water inlet of the pre-anoxic tank 5 is connected with the water outlet of the primary sedimentation tank 4 in the primary treatment unit, and the water outlet of the pre-anoxic tank 5 is connected with the water inlet of the anaerobic tank 6, so as to carry out anaerobic ammonia oxidation biological denitrification on the effluent of the primary treatment unit, provide optimal conditions for organic hydrolysis reaction in the anaerobic section of the secondary biochemical treatment unit, enable the denitrification process in the anaerobic tank to be thorough, and improve the denitrification efficiency.
In an embodiment of the invention, the water inlet of the pre-anoxic tank 5 is further connected with the sludge return outlet of the secondary sedimentation tank 13, and is used for receiving a part of sludge subjected to sludge-water separation in the secondary sedimentation tank to return to the pre-anoxic tank 5, and under the action of activated sludge, organic matters in wastewater are removed, and the denitrification capability is enhanced.
In the invention, the pre-anoxic tank 5 is arranged in the secondary biochemical treatment unit, partial raw water and return sludge of the secondary sedimentation tank 13 are introduced into the pre-anoxic tank 5 to carry out anaerobic ammonia oxidation biological denitrification so as to strengthen the denitrification capability of the system. Meanwhile, nitrate in the returned sludge can be effectively removed through anaerobic ammoxidation in the pre-anoxic tank, low-concentration nitrate in the inlet water of the anaerobic tank is ensured, the phosphorus release efficiency of the anaerobic tank is improved, and the phosphorus removal effect is enhanced.
In one embodiment of the invention, in the secondary biochemical treatment unit, suspended carriers are added into the aerobic tank I8 and the aerobic tank II 10 to form an MBBR (moving bed biofilm reactor) sludge film composite system, so that fixed enrichment and continuous retention of nitrifying floras are realized, and the sludge growth age required by the nitrifying floras is ensured, thereby reducing the sludge age in a suspended state to a certain extent, strengthening biological phosphorus removal, and particularly removing soluble TP (phosphorus).
Aerobic tank I8 (i.e. MBBR aerobic tank I8): is connected with the water outlet of the anoxic tank I7 and is used for enhancing biological phosphorus removal and removing organic matters in water under the action of activated sludge.
Aerobic pool II 10 (i.e. MBBR aerobic pool I10): is connected with the water outlet of the anoxic tank II 9 and is used for further removing phosphorus and organic matters.
The invention adopts multi-stage AO treatment units, namely an anaerobic tank 6, an anoxic tank I7, an MBBR aerobic tank I8, an anoxic tank II 9 and an MBBR aerobic tank II 10, to degrade organic pollutants, and reduces the energy consumption of internal reflux compared with the traditional internal reflux denitrification process.
In one embodiment of the invention, the denitrification filter 11 adopts quartz sand as a biofilm formation medium of denitrification organisms, and is used for removing nitric acid nitrogen and suspended substances. Further, the denitrification filter 11 is a denitrification deep bed filter.
In the invention, a denitrification deep bed filter is arranged in the secondary biochemical treatment unit, because of the multistage A at the front end2The denitrification efficiency of the/O process is high, so that the denitrification filter 11 is designed without considering a large amount of TN removal and only considering the situation under extreme conditions, and therefore, the occupied area is further reduced.
A depth processing unit: according to the water flow direction, the device comprises an ozone oxidation device 14, an activated carbon adsorption device 15, a fiber filter 16, a disinfection tank 17 and a clean water tank 18 which are connected in sequence. The device is used for carrying out advanced treatment on the effluent after the secondary biochemical treatment, and ensures that the quality of the effluent stably meets the requirement of the surface water quality.
Ozone oxidation device 14: is connected with the water outlet of the high-efficiency coagulating sedimentation tank 12 and is used for further degrading organic matters which are difficult to be biologically degraded in the wastewater. The ozone oxidation device 14 comprises an ozone catalytic oxidation tower, an ozone generator for providing ozone for the ozone catalytic oxidation tower and an ozone tail gas destructor, wherein the ozone generator adopts an oxygen source, and oxygen is supplied by a liquid oxygen station; the ozone tail gas destructor is used for treating ozone tail gas generated by the ozone catalytic oxidation tower so as to enable the ozone tail gas to reach the safe emission standard.
In the invention, the ozone tail gas generated by the ozone catalytic oxidation tower is collected by a pipeline and is safely discharged after being treated by the ozone tail gas destructor.
Activated carbon adsorption device 15: is connected with the water outlet of the ozone oxidation device 14 and is used for further adsorbing organic matters and suspended matters in the sewage, decoloring the wastewater and ensuring the quality of the effluent.
In the invention, an ozone oxidation and activated carbon adsorption process is arranged at the advanced treatment section so as to further remove organic matters which are difficult to biodegrade in the wastewater and decolor the wastewater.
The fiber filter 16: is connected with the water outlet of the activated carbon adsorption device 15, takes long fibers made of organic molecular materials as filtering materials and is used for intercepting suspended matters in the wastewater and further improving the quality of the effluent.
The disinfection tank 17: is connected with the water outlet of the fiber filter 16 and is used for carrying out disinfection and sterilization treatment on the wastewater.
The clean water tank 18: is connected with the water outlet of the disinfection tank 17 and is used for storing the outlet water after disinfection treatment and discharging the outlet water with the quality reaching the standard.
A sludge treatment unit: comprises a sludge concentration tank 19, a sludge storage tank 20 and a dewatering machine room 21 which are connected in sequence. The sludge treatment device is used for concentrating, dehydrating and drying the sludge obtained in the secondary biochemical treatment unit to prepare a dry sludge cake and then transporting the dry sludge cake to the outside; sludge produced by the advanced treatment unit can also be treated. Wherein,
sludge thickener 19: and the sludge outlet of the high-efficiency coagulating sedimentation tank 12, the secondary sedimentation tank 13 and the activated carbon adsorption device 15 is connected for carrying out concentration treatment on the sludge from the high-efficiency coagulating sedimentation tank 12, the secondary sedimentation tank 13 and the activated carbon adsorption device 15.
The invention also provides a sewage treatment method for upgrading and transforming the town sewage plant by adopting the system, which adopts the following technical scheme:
the sewage treatment method for upgrading and transforming the urban sewage plant by adopting the system comprises the following steps: primary treatment, secondary biochemical treatment, advanced treatment and sludge treatment; wherein,
the secondary biochemical treatment step sequentially comprises pre-anoxic treatment, anaerobic treatment, I-section anoxic treatment, I-section aerobic treatment, II-section anoxic treatment and II-section aerobic treatment;
the sewage after the primary treatment is respectively fed into a pre-anoxic tank, an anoxic tank I and an anoxic tank II according to a proportion, the sewage after the primary treatment directly provides a carbon source for denitrification reaction, the residual carbon pollutants are removed in an aerobic section, and ammonia nitrogen is oxidized into nitrate nitrogen in the aerobic section to be fed into the anoxic section for treatment.
As a preferred embodiment of the present invention, the primary treatment sequentially includes a coarse grid treatment, a fine grid treatment, a sand setting treatment, and a primary settling treatment.
The first-stage treatment of a certain town sewage plant adopts 'coarse/fine grid-sand setting-primary sedimentation' treatment, raw water is subjected to removal and interception of large suspended matters and floating matters by the coarse grid, then the raw water plays a role in protecting a subsequent pipe pump, then the raw water enters a water inlet pump station to raise the water level to the fine grid to remove the suspended matters, then the raw water automatically flows into a sand basin by means of gravity to remove inorganic particles such as silt and impurities with high density in sewage, and then the raw water enters the primary sedimentation tank to remove settleable matters, floating matters and some colloidal substances, so that the load of subsequent treatment facilities is reduced. The effluent of the primary treatment after the primary sedimentation tank treatment enters a subsequent secondary biochemical treatment unit for biochemical treatment.
As a preferred embodiment of the invention, the secondary biochemical treatment step also comprises denitrification treatment, high-efficiency coagulating sedimentation treatment and secondary sedimentation treatment in sequence after the section II aerobic treatment; in the secondary biochemical treatment step, the effluent of the primary treatment and the return sludge of the secondary sedimentation tank are introduced into a pre-anoxic tank 5 for anaerobic ammonia oxidation biological denitrification so as to strengthen the denitrification capability of the system.
In the invention, a plurality of stages of AO are arranged in the secondary biochemical treatment, namely an anaerobic tank 6, an anoxic tank I7, an aerobic tank I8, an anoxic tank II 9 and an aerobic tank II 10. Compared with the traditional internal reflux denitrification process, the energy consumption of internal reflux is reduced.
In the invention, the secondary biochemical treatment adopts sectional water inflow, the effluent of the primary treatment enters the pre-anoxic tank 5, the anoxic reaction tank I7 and the anoxic reaction tank II 9 respectively according to the proportion, the sewage directly provides a carbon source for the denitrification reaction, the carbon source in the raw water is fully utilized, the additional carbon source is obviously saved, and the denitrification capability of the system is enhanced; meanwhile, nitrate in the returned sludge can be effectively removed through anaerobic ammoxidation in the pre-anoxic tank 5, low-concentration nitrate in the inlet water of the anaerobic tank is ensured, the phosphorus release efficiency of the anaerobic tank is improved, and the phosphorus removal effect is enhanced.
As a preferred embodiment of the invention, in the aerobic treatment step, suspension carriers are added into the aerobic tank I and the aerobic tank II to form an MBBR sludge membrane composite system, so that the fixed enrichment of nitrifying floras is realized, and the sludge growth age required by the nitrifying floras is ensured, thus the sludge age in a suspended state can be reduced to a certain extent, the biological phosphorus removal is enhanced, and particularly the removal effect on soluble TP is achieved.
The advanced treatment step sequentially comprises ozone oxidation treatment, activated carbon adsorption treatment, fiber filtration treatment and disinfection treatment. Wherein,
in the ozone oxidation treatment step, an ozone generator is adopted to provide an ozone source for the oxidation treatment of the secondary biochemical treatment effluent, so as to further degrade organic pollutants which are difficult to biodegrade in the wastewater; after the ozone tail gas is collected by the pipeline, the ozone tail gas is safely discharged after being treated by the ozone tail gas destructor, and secondary pollution caused by the ozone tail gas is avoided.
In a preferred embodiment of the invention, the ozone generator uses a source of oxygen, which is supplied from a liquid oxygen station.
In the step of activated carbon adsorption treatment, the effluent after ozone oxidation treatment is subjected to activated carbon adsorption treatment, so that organic matters in the wastewater are further removed and the wastewater is decolorized.
In the invention, an ozone oxidation and active carbon adsorption treatment method is adopted in the advanced treatment step to further remove organic matters which are difficult to biodegrade in the wastewater and decolor the wastewater.
In the step of fiber filtration treatment, the sewage after the activated carbon adsorption treatment is filtered, and long fibers made of organic molecular materials are used as filtering materials and are used for intercepting suspended matters in the sewage to further improve the quality of the effluent.
In the step of disinfection treatment, the effluent after fiber filtration is disinfected by ozone, and the effluent after disinfection treatment enters a clean water tank for storage or reaches the standard for discharge. In the invention, the disinfection treatment adopts ozone disinfection, and disinfection and advanced treatment are considered comprehensively, thereby reducing the system investment cost.
In the invention, the step of disinfection treatment adopts ozone disinfection, disinfection and advanced treatment are considered comprehensively, and the system investment cost is reduced.
The sludge treatment step sequentially comprises sludge concentration, sludge storage, dehydration and drying and reutilization. Wherein in the sludge concentration treatment, the sludge obtained from the high-efficiency coagulating sedimentation treatment, the secondary sedimentation treatment and the active carbon adsorption treatment is concentrated.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Variations and modifications to these embodiments may occur to those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The sewage treatment system for upgrading and transforming the urban sewage plant is characterized by comprising a primary treatment unit, a secondary biochemical treatment unit, an advanced treatment unit and a sludge treatment unit which are sequentially connected; the secondary biochemical treatment unit adopts a multi-stage AO treatment system, and the multi-stage AO treatment system comprises an anaerobic tank, an anoxic tank I, an aerobic tank I, an anoxic tank II and an aerobic tank II which are connected in sequence; the secondary biochemical treatment unit also comprises a pre-anoxic tank which is arranged in front of the anaerobic tank and is used for performing anaerobic ammonium oxidation biological denitrification on the effluent of the primary treatment unit;
the water outlet of the primary treatment unit is respectively connected with the water inlets of at least two of the pre-anoxic tank, the anoxic tank I and the anoxic tank II in the secondary biochemical treatment unit, so that the sewage from the primary treatment unit provides a carbon source for denitrification.
2. The system of claim 1, wherein the primary treatment unit comprises a coarse grid, a fine grid, a grit chamber and a primary settling chamber which are connected in sequence according to the water flow direction;
preferably, the water inlet of the pre-anoxic tank is connected with the water outlet of the primary sedimentation tank in the primary treatment unit, and the water outlet of the pre-anoxic tank is connected with the water inlet of the anaerobic tank, and is used for performing anammox biological denitrification on the effluent of the primary treatment unit.
3. The system of claim 2, wherein in the secondary biochemical treatment unit, a suspension carrier is added into the aerobic tank I and the aerobic tank II to form an MBBR sludge membrane composite system;
preferably, the secondary biochemical treatment unit is also sequentially provided with a denitrification filter tank, a coagulation sedimentation tank and a secondary sedimentation tank behind the aerobic tank II; preferably, the denitrification filter tank is a denitrification deep bed filter tank;
preferably, the water inlet of the pre-anoxic tank is further connected with a sludge return outlet of the secondary sedimentation tank, and is used for receiving a part of sludge after mud-water separation of the secondary sedimentation tank to return to the pre-anoxic tank, and the pre-anoxic tank removes organic matters in wastewater under the action of activated sludge and strengthens denitrification capability.
4. The system of claim 1, wherein the advanced treatment unit comprises an ozone oxidation device, an activated carbon adsorption device and a fiber filter which are connected in sequence;
preferably, the ozone oxidation device comprises an ozone catalytic oxidation tower, an ozone generator for providing ozone for the ozone catalytic oxidation tower and an ozone tail gas destructor; wherein, the ozone generator adopts an oxygen source, and oxygen is supplied by the liquid oxygen station; the ozone tail gas destructor is used for treating ozone tail gas generated by the ozone catalytic oxidation tower so as to enable the ozone tail gas to reach the safe emission standard;
preferably, in the advanced treatment unit, a disinfection tank and a clean water tank are also connected in sequence after the fiber filter tank; the disinfection tank is used for disinfecting the effluent filtered by the fiber filter.
5. A method for treating sewage by upgrading a town sewage plant using the sewage treatment system as claimed in any one of claims 1 to 4, comprising the steps of: primary treatment, secondary biochemical treatment, advanced treatment and sludge treatment; wherein,
the secondary biochemical treatment step sequentially comprises pre-anoxic treatment, anaerobic treatment, I-section anoxic treatment, I-section aerobic treatment, II-section anoxic treatment and II-section aerobic treatment;
the sewage after the primary treatment is respectively fed into a pre-anoxic tank, an anoxic tank I and an anoxic tank II according to a proportion, the sewage after the primary treatment directly provides a carbon source for denitrification reaction, the residual carbon pollutants are removed in an aerobic section, and ammonia nitrogen is oxidized into nitrate nitrogen in the aerobic section to be fed into the anoxic section for treatment.
6. The sewage treatment method according to claim 5, wherein the secondary biochemical treatment step further comprises denitrification treatment, high-efficiency coagulating sedimentation treatment and secondary sedimentation treatment in sequence after the section II aerobic treatment; in the secondary biochemical treatment step, the effluent of the primary treatment and the return sludge of the secondary sedimentation tank are introduced into a pre-anoxic tank for anaerobic ammonia oxidation biological denitrification so as to strengthen the denitrification capability of the system.
7. The sewage treatment method according to claim 5 or 6, wherein in the step of the aerobic treatment in the section I and the aerobic treatment in the section II, suspended carriers are added into the aerobic tank I and the aerobic tank II to form an MBBR sludge membrane composite system.
8. The wastewater treatment method according to claim 5, wherein the primary treatment comprises a coarse grid treatment, a fine grid treatment, a sand setting treatment and a primary setting treatment in sequence.
9. The wastewater treatment method according to claim 6, wherein the advanced treatment step comprises an ozone oxidation treatment, an activated carbon adsorption treatment, a fiber filtration treatment and a disinfection treatment in this order;
preferably, in the ozone oxidation treatment step, an ozone generator is adopted to provide an ozone source for oxidation treatment of the secondary biochemical treatment effluent, so as to further degrade organic pollutants which are difficult to biodegrade in the wastewater; after being collected by a pipeline, the ozone tail gas is safely discharged after being treated by the ozone tail gas destructor, so that secondary pollution caused by the ozone tail gas is avoided; preferably, the ozone generator uses an oxygen source, and the oxygen is supplied by the liquid oxygen station;
preferably, in the step of activated carbon adsorption treatment, the effluent after ozone oxidation treatment is subjected to activated carbon adsorption treatment, so as to further remove organic matters in the wastewater and decolor the wastewater;
preferably, in the step of fiber filtration treatment, the sewage after the activated carbon adsorption treatment is subjected to filtration treatment for intercepting suspended matters in the wastewater, so that the quality of the effluent is further improved;
preferably, in the step of disinfection treatment, ozone is adopted to disinfect effluent after fiber filtration, and the effluent after disinfection treatment enters a clean water tank to be stored or is discharged after reaching standards.
10. The sewage treatment method according to any one of claim 9, wherein the sludge treatment step comprises sludge concentration, sludge storage, dehydration drying and reuse in this order; wherein in the sludge concentration treatment, the sludge obtained from the high-efficiency coagulating sedimentation treatment, the secondary sedimentation treatment and the active carbon adsorption treatment is concentrated.
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| CN114180791A (en) * | 2021-12-13 | 2022-03-15 | 沈煜 | High concentration refractory wastewater carries mark processing apparatus |
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