CN110104871B - Distributed biochemical system for treating domestic sewage and domestic sewage treatment method - Google Patents
Distributed biochemical system for treating domestic sewage and domestic sewage treatment method Download PDFInfo
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- CN110104871B CN110104871B CN201910278930.6A CN201910278930A CN110104871B CN 110104871 B CN110104871 B CN 110104871B CN 201910278930 A CN201910278930 A CN 201910278930A CN 110104871 B CN110104871 B CN 110104871B
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a distributed biochemical system for treating domestic sewage, which comprises a biochemical tower and an artificial wetland, and comprises an adjusting tank, an anoxic tank, a sedimentation tank, at least two trickling filters and a water collecting tank for collecting effluent of the trickling filters, wherein the adjusting tank is used for adjusting the water collecting tank; the anoxic tank is connected with the first trickling filter device through a first pipeline, is connected with the second trickling filter device through a second pipeline, and is also connected with the anoxic tank through a first circulating pipeline; the water collecting tank is connected with the first trickling filter device through a second circulating pipeline, is connected with the second trickling filter device through a third circulating pipeline, is connected with the anoxic tank through a fourth circulating pipeline, and is connected with the sedimentation tank through a third pipeline. The biochemical system of the invention forms a complete 'trickling filtration + AO' process by the mutual cooperation of the regulating tank, the anoxic tank, the water collecting tank, the sedimentation tank, the artificial wetland, the trickling filtration device and the pipeline system which can realize multiple functions, and strengthens the nitrogen and phosphorus removal effect of the whole process.
Description
Technical Field
The invention relates to the technical field of domestic sewage treatment, in particular to a distributed biochemical system for treating domestic sewage and a domestic sewage treatment method.
Background
In recent years, China invests a lot of manpower and financial resources in the field of wastewater treatment, and the water environment quality is generally stable and medium with the continuous promotion of water environment treatment. At present, domestic sewage treatment processes at home and abroad mainly adopt a traditional activated sludge method and deformation processes thereof, such as AO, A2O, inverted A2O, MBR and other biochemical system domestic sewage treatment processes, and the processes lead each area of a biochemical system to be in a better state through strict space division, wherein an aerobic pool (O pool) is used as an important treatment unit, and oxygen supply energy consumption accounts for 60-80% of total operating energy consumption. The distribution of dissolved oxygen in the aeration process of domestic sewage treatment directly affects the effect of domestic sewage treatment and the activity of sludge and even the quality of effluent water. However, the existing biochemical system has high operation cost and large occupied space, and is difficult to be applied and popularized on a large scale.
Disclosure of Invention
The invention aims to solve the technical problem of providing a distributed biochemical system for treating domestic sewage, which occupies small space and has low domestic sewage treatment cost.
The invention also aims to solve the technical problem of providing a domestic sewage treatment method which has good domestic sewage treatment effect and low cost.
In order to solve the technical problem, the invention provides a distributed biochemical system for treating domestic sewage, which comprises a biochemical tower and an artificial wetland, wherein the biochemical tower comprises an underground part and an overground part, the underground part comprises a regulating tank, an anoxic tank and a sedimentation tank, and the overground part comprises at least two trickling filters and a water collecting tank for collecting effluent of the trickling filters;
the adjusting tank is communicated with the anoxic tank, and the sedimentation tank is communicated with the artificial wetland;
the anoxic tank is connected with the first trickling filter device through a first pipeline, is connected with the second trickling filter device through a second pipeline, and is also connected with the anoxic tank through a first circulating pipeline;
the water collecting tank is connected with the first trickling filter device through a second circulating pipeline, is connected with the second trickling filter device through a third circulating pipeline, is connected with the anoxic tank through a fourth circulating pipeline, and is connected with the sedimentation tank through a third pipeline.
As an improvement of the above scheme, a first switch is arranged on the first pipeline, a second switch is arranged on the second pipeline, a third switch is arranged on the first circulating pipeline, a fourth switch is arranged on the second circulating pipeline, a fifth switch is arranged on the third circulating pipeline, a sixth switch is arranged on the fourth circulating pipeline, and a seventh switch is arranged on the third pipeline.
As an improvement of the scheme, the anoxic tank is internally provided with a suspended filler, the density of the suspended filler is 95-110% of the sewage density, and the suspended filler is made of high-density polyethylene and has the diameter of 2-7 cm.
As an improvement of the scheme, the volume of the suspended filler is 20-40% of the volume of the sewage in the anoxic tank.
As an improvement of the scheme, the trickling filter device comprises a water distributor and a main filler, wherein the water distributor is positioned above the main filler, the main filler is composed of steel slag and iron slag, and the volume ratio of the steel slag to the iron slag is 1: (3-5).
As an improvement of the scheme, the trickling filter device further comprises ceramsite, and the ceramsite is paved on different heights of the main body filler.
As an improvement of the scheme, the side wall of the tower body is provided with a plurality of air inlet micropores.
As an improvement of the scheme, the artificial wetland comprises calcium-based dephosphorization filler and wetland plants planted on the calcium-based dephosphorization filler and a planting soil layer.
As an improvement of the scheme, the calcium-based phosphorus removal filler comprises sand aerated blocks and pyrite slag, and the wetland plant is mulberry Beius.
Correspondingly, the invention also provides a domestic sewage treatment method, which adopts the distributed biochemical system to treat domestic sewage.
The implementation of the invention has the following beneficial effects:
the invention provides a distributed biochemical system for treating domestic sewage, which comprises a biochemical tower and an artificial wetland, wherein the biochemical tower comprises an underground part and an overground part, the underground part comprises a regulating tank, an anoxic tank and a sedimentation tank, and the overground part comprises at least two trickling filters and a water collecting tank for collecting effluent of the trickling filters.
The distributed biochemical system of the invention forms a complete 'trickling filtration + AO' process by the mutual cooperation of the regulating tank, the anoxic tank, the water collecting tank and the trickling filtration device, namely, the trickling filtration and the AO process are combined, thereby not only improving the treatment efficiency of sewage, but also strengthening the denitrification and dephosphorization effects of the whole process, and simultaneously, the distributed biochemical system is matched with the advanced treatment of the sedimentation tank and the artificial wetland, so that the effluent can stably reach the first-class A standard in the pollutant discharge standard of urban sewage treatment plants (GB18918-2002), namely the current strictest effluent standard in China.
Compared with the traditional AO process, the invention realizes the connection of the trickling filtration process and the AO process through ingenious pipeline connection, and can be switched into different hydraulic conditions according to different requirements so as to meet different requirements and realize different functions.
The biochemical tower adopts the steel slag and the iron slag as main filling materials, the artificial wetland adopts the sand aerated block as the filling material and is matched with a small amount of pyrite slag, all the filling materials are waste slag or construction waste, the price is low, the cost can be effectively saved, and the materials can be found in various regions, so that the local production can be realized, long-distance transportation is not needed, the cost can be saved, and the price of each ton of the filling materials can be reduced to 200 yuan/m3The price of the traditional filler (such as volcanic rock) is 1000 yuan/m3。
The artificial wetland is adopted to realize the advanced treatment of sewage, and is different from the traditional artificial wetland in that the artificial wetland adopts a square backflow type design, the construction is simple, the occupied area can be saved, and the occupied area can be 4m from each water of the traditional artificial wetland2Reduced to 2m2In addition, the nitrogen and phosphorus adsorption capacity of the mulberry bud as the wetland plant can be improved by about 30 percent compared with that of the traditional wetland plant (such as reed, canna and the like).
Drawings
FIG. 1 is a schematic view of a bio-dispersal system of the present invention;
FIG. 2 is a schematic view of a biochemical column of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the distributed biochemical system for treating domestic sewage provided by the invention comprises a biochemical tower 1 and an artificial wetland 2, wherein the biochemical tower 1 comprises an underground part and an overground part, the underground part comprises a regulating tank 11, an anoxic tank 12 and a sedimentation tank 13, and the overground part comprises at least two trickling filters 14 and a water collecting tank 15 for collecting effluent of the trickling filters.
The biochemical towers of the invention are connected through different pipelines to realize different functions. Specifically, the adjusting tank 11 is communicated with the anoxic tank 12, and the sedimentation tank 13 is communicated with the artificial wetland 2; the anoxic tank 12 is connected with the first trickling filter 14 through a first pipeline 31, is connected with the second trickling filter 14 through a second pipeline 32, and is also connected with the anoxic tank 12 through a first circulating pipeline 33; the water collecting tank 15 is connected with the first trickling filter 14 through a second circulating pipeline 34, connected with the second trickling filter 14 through a third circulating pipeline 35, connected with the anoxic tank 12 through a fourth circulating pipeline 36, and connected with the sedimentation tank 13 through a third pipeline 37.
Preferably, a first switch 41 is disposed on the first pipeline 31, a second switch 42 is disposed on the second pipeline 42, a third switch 43 is disposed on the first circulating pipeline 33, a fourth switch 44 is disposed on the second circulating pipeline 34, a fifth switch 45 is disposed on the third circulating pipeline 35, a sixth switch 46 is disposed on the fourth circulating pipeline 36, and a seventh switch 47 is disposed on the third pipeline 37. In other embodiments of the present application, the connection relationship may be implemented by different connection manners.
Specifically, a suspension filler is arranged in the anoxic tank. During operation, domestic sewage firstly enters the regulating reservoir to balance water quality and water quantity, and then is lifted to the anoxic reservoir, the suspended filler in the anoxic reservoir increases the adhesiveness of microorganisms, the biomass in the hydrolysis acidification process is improved, insoluble organic matters are hydrolyzed into soluble substances under the action of a large number of hydrolysis-acid-producing bacteria, and macromolecular and difficultly biodegradable substances are converted into easily biodegradable substances, so that the effect of intercepting suspended matters in sewage can be achieved, and the functions of partial biochemical treatment and sludge volume reduction stabilization are also achieved.
In order to enrich the microorganisms in the sewage, a biofilm can be formed on the suspended filler, and the density of the suspended filler is 95-110% of the sewage density. If the density of the suspended filler is lower than 95% of the sewage density, microorganisms and the suspended filler can deposit on the bottom of the tank to form sludge, and the sludge is finally discharged, so that the treatment effect is influenced.
Preferably, the volume of the suspended filler is 20-40% of the volume of the sewage in the anoxic tank. More preferably, the volume of the suspended filler is 30% of the volume of the sewage in the anoxic tank.
Furthermore, the suspension filler is made of high-density polyethylene and has the diameter of 2-7 cm. The invention adopts hydrophilic materials as the suspended filler and selects proper particle size, which is beneficial to the enrichment of microorganisms on the suspended filler.
Referring to fig. 2, the trickling filter device 14 includes a water distributor 141 and a body packing 142. Wherein, the water distributor 141 is positioned above the main packing 142.
When the device works, sewage is lifted to the water distributor of the trickling filter device and then is treated by the main filler, and the treated water is directly trickled into the water collecting tank. The water distributor is provided with a porous water pipe. Preferably, the trickling filter device comprises 2 trickling filter devices, and the two trickling filter devices can be connected in series or in parallel. It should be noted that in other embodiments of the present application, other types of packing materials are also included in the tower body.
The main filler of the invention consists of steel slag and iron slag, wherein the volume ratio of the steel slag to the iron slag is 1: (3-5). The main filler of the invention can adsorb COD and nitrogen in sewage and can decolor sewage. If the ratio of the steel slag to the iron slag exceeds the above range, the effect of treating the sewage is affected.
The trickling filter 14 further comprises ceramsite 143, and at least one layer of ceramsite 143 is laid in the main filler 142. The ceramsite is arranged at different height positions of the main body filler, and plays a role in uniformly distributing water. Preferably, the diameter of the ceramsite is 1-3 cm.
The biochemical tower adopts a frame tower structure, the side wall of the tower body is provided with a plurality of air inlet micropores, the air permeability is good, aeration is not needed, and the operation energy consumption can be obviously saved.
The water in the water collecting tank 15 passes through the sedimentation tank 13 and the artificial wetland 2 in sequence to complete the advanced treatment of the sewage, so that the effluent can stably reach the first class A standard in the pollutant discharge Standard of urban wastewater treatment plants (GB 18918-2002).
Specifically, the artificial wetland comprises calcium-based dephosphorization filler and wetland plants planted on the calcium-based dephosphorization filler and a planting soil layer.
Preferably, the constructed wetland is of a square backflow structure, the square structure is more convenient and simpler in civil engineering, the backflow structure is greatly different from that of the traditional wetland, and the design is favorable for saving the occupied land.
Preferably, the calcium-based phosphorus removal filler is a sand aerated block.
Preferably, in the artificial wetland, a small amount of pyrite slag is matched in addition to the calcium-based phosphorus removal filler.
Preferably, the wetland plant is mulberry louis, and the use of mulberry louis as the wetland plant is not common, but the sewage treatment effect is more effective than that of the traditional plant.
The outer wall of the tower body can be matched with the beautiful country landscape and policy for doodling, and the tower has remarkable social value.
Correspondingly, the invention also provides a domestic sewage treatment method, which adopts the biochemical system to treat domestic sewage.
When the device works, domestic sewage firstly enters the regulating tank to balance water quality and water quantity, and then is lifted to the anoxic tank, the suspended filler in the anoxic tank increases the adhesiveness of microorganisms, the biomass in the hydrolytic acidification process is improved, insoluble organic matters are hydrolyzed into soluble substances under the action of a large number of hydrolysis-acid-producing bacteria, and macromolecular and difficultly biodegradable substances are converted into easily biodegradable substances, so that the effect of intercepting suspended matters in the sewage can be achieved, and the device also has the functions of partial biochemical treatment and sludge volume reduction stabilization; after the water treated by the anoxic tank is lifted, 20-30% of sewage directly flows back to the anoxic tank, and under the action, the anoxic tank does not need to be provided with mechanical stirring, so that the operation energy consumption can be obviously saved; the other part is lifted to a biochemical tower for treatment; and lifting the rest sewage to a biochemical tower for treatment, wherein the water part treated by the biochemical tower enters an anoxic tank, and the rest enters a sedimentation tank and an artificial wetland to finish the advanced treatment of the sewage.
The biochemical tower of the invention is connected by different pipelines to realize the following functions:
in the small reflux mode, the third switch 43 is opened, the other switches are closed, and the effluent of the anoxic tank directly flows back to the anoxic tank, so that the sewage in the anoxic tank and the suspended filler can be effectively stirred;
secondly, in a large reflux mode, the first switch 41, the second switch 42 and the sixth switch 46 are turned on, and the other switches are turned off, so that the effluent of the trickling filtration device returns to the anoxic tank again to realize the A/O process and enhance the denitrification and dephosphorization effects;
thirdly, in a series mode, the first switch 41, the second switch 42 and the seventh switch 47 are turned on, the other switches are turned off, all the effluent of the trickling filter device is discharged into the artificial wetland in the mode, and the two trickling filter devices simultaneously treat the sewage, so that the sewage treatment capacity is improved;
in the parallel mode, the first switch 41, the fifth switch 45, the sixth switch 46 and the seventh switch 47 are turned on, and the rest switches are turned off, or the second switch 42, the fourth switch 44, the sixth switch 46 and the seventh switch 47 are turned on, and the rest switches are turned off, so that part of sewage discharged from the trickling filter device in the mode flows back to the anoxic tank, the A/O process is realized, part of sewage is discharged into the artificial wetland for advanced treatment, and the treatment effect of the sewage is effectively improved;
and fifthly, in a biofilm culturing mode, the fourth switch 44 or/and the fifth switch 45 is/are turned on, the other switches are turned off, and the effluent of the trickling filter device flows back to the trickling filter device in the mode so as to realize the biofilm culturing of microorganisms of the trickling filter device.
The biochemical system of the invention forms a complete 'trickling filtration + AO' process by the mutual cooperation of the regulating tank, the anoxic tank, the water collecting tank, the sedimentation tank, the artificial wetland and the trickling filtration device, and strengthens the denitrification and dephosphorization effects of the whole process.
Compared with the traditional AO technology, the invention realizes the connection of the trickling filtration technology and the AO technology through ingenious pipeline connection, and can be switched into different hydraulic conditions according to different requirements to meet different requirements and realize different functions.
The biochemical tower of the invention adopts steel slag and iron slag as main filling materials, and the artificial wetland adopts sand aerated block as the filling material and is matched with a small amount of sulfurAll the fillers of the iron ore slag are waste residues or construction waste materials, the cost is effectively saved due to low price, and the materials can be found in various regions, so that the local production can be realized, long-distance transportation is not needed, the cost can be saved, and the price of each ton of the fillers can be reduced to 200 yuan/m3The price of the traditional filler (such as volcanic rock) is 1000 yuan/m3。
The invention adopts the artificial wetland to realize the advanced treatment of sewage, and is different from the traditional artificial wetland, the artificial wetland of the invention adopts a square backflow type design, the construction is simple, the occupied area can be saved, and the occupied area can be 4m from each square of the traditional artificial wetland2Reduced to 2m2In addition, the nitrogen and phosphorus adsorption capacity of the mulberry bud as the wetland plant can be improved by about 30 percent compared with that of the traditional wetland plant (such as reed, canna and the like).
The invention will now be further illustrated by the following specific examples
Example 1
The project is located in the famous city of Guangdong province, the project adopts the biochemical system of the invention to treat domestic sewage, the total number of workers in the collecting range of the domestic sewage pipe network is 352 (64 households), the water quota of rural residents is 120L/man.d, the pollution discharge coefficient is 80 percent, and the daily treatment capacity can reach 40m3The treatment effect is shown in Table 1.
Table 1 shows the parameters before and after the treatment of domestic wastewater
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (5)
1. A distributed biochemical system for treating domestic sewage is characterized by comprising a biochemical tower and an artificial wetland, wherein the biochemical tower comprises an underground part and an overground part, the underground part comprises a regulating tank, an anoxic tank and a sedimentation tank, and the overground part comprises at least two trickling filters and a water collecting tank for collecting the effluent of the trickling filters;
the trickling filter device comprises a water distributor and a main filler, wherein the water distributor is positioned above the main filler, the main filler is composed of steel slag and iron slag, and the volume ratio of the steel slag to the iron slag is 1: (3-5);
the adjusting tank is communicated with the anoxic tank, and the sedimentation tank is communicated with the artificial wetland;
the anoxic tank is connected with the first trickling filter device through a first pipeline, is connected with the second trickling filter device through a second pipeline, and is also connected with the anoxic tank through a first circulating pipeline;
the anaerobic tank is internally provided with a suspended filler, the density of the suspended filler is 95-110% of the sewage density, and the suspended filler is made of high-density polyethylene and has the diameter of 2-7 cm;
the water collecting tank is connected with the first trickling filtration device through a second circulating pipeline, connected with the second trickling filtration device through a third circulating pipeline, connected with the anoxic tank through a fourth circulating pipeline and connected with the sedimentation tank through a third pipeline;
a first switch is arranged on the first pipeline, a second switch is arranged on the second pipeline, a third switch is arranged on the first circulating pipeline, a fourth switch is arranged on the second circulating pipeline, a fifth switch is arranged on the third circulating pipeline, a sixth switch is arranged on the fourth circulating pipeline, and a seventh switch is arranged on the third pipeline;
the artificial wetland comprises a calcium-based dephosphorization filler and wetland plants planted on the calcium-based dephosphorization filler and a planting soil layer;
the calcium-based dephosphorization filler comprises sand aerated blocks and pyrite slag, and the wetland plant is mulberry Beisi.
2. The distributed biochemical system according to claim 1, wherein the volume of the suspended filler is 20% to 40% of the volume of wastewater in the anoxic tank.
3. The biochemical system of claim 1, wherein the trickling filter further comprises ceramic particles, and the ceramic particles are laid on different heights of the main filler.
4. The distributed biochemical system according to claim 3, wherein the side wall of the tower body is provided with a plurality of air inlet pores.
5. A domestic sewage treatment method, characterized in that the decentralized biochemical system according to any one of claims 1 to 4 is used to treat domestic sewage.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928095A (en) * | 2009-10-30 | 2010-12-29 | 江西省科学院能源研究所 | Distributed domestic sewage treatment method |
| CN102730899A (en) * | 2011-04-12 | 2012-10-17 | 池锦蓉 | Plant landscape-type sewage ecological treatment technology |
| CN205011591U (en) * | 2015-09-30 | 2016-02-03 | 河南寰宇环保科技有限公司 | Rural sewage treating system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2698353B1 (en) * | 2007-04-12 | 2024-02-07 | Novozymes Biologicals, Inc. | Wastewater treatment using microbial strains |
| US20120074057A1 (en) * | 2010-09-23 | 2012-03-29 | James Steven Kovalak | Septage treatment system and process |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928095A (en) * | 2009-10-30 | 2010-12-29 | 江西省科学院能源研究所 | Distributed domestic sewage treatment method |
| CN102730899A (en) * | 2011-04-12 | 2012-10-17 | 池锦蓉 | Plant landscape-type sewage ecological treatment technology |
| CN205011591U (en) * | 2015-09-30 | 2016-02-03 | 河南寰宇环保科技有限公司 | Rural sewage treating system |
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