CN114275896B - Percolation biochemical treatment system applied to denitrification of enhanced percolation system - Google Patents
Percolation biochemical treatment system applied to denitrification of enhanced percolation system Download PDFInfo
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Abstract
The application discloses a percolation biochemical treatment system applied to strengthening the denitrification of a percolation system, which comprises a nitrification water collecting tank, a nitrification percolation biochemical unit, a denitrification water collecting tank and a denitrification percolation biochemical unit, wherein inorganic ammonia nitrogen wastewater in the nitrification water collecting tank is intermittently, regularly and quantitatively lifted to the nitrification percolation biochemical unit for uniform water distribution through a lifting pump, flows into the denitrification water collecting tank through a nitrification water outlet pipe, then enters the denitrification percolation biochemical unit through the lifting pump, adsorbs ammonia nitrogen through zeolite powder in ceramsite in the nitrification percolation biochemical unit, provides an alkali source through calcite, and uses cerium oxide as an oxygen storage material, so that baking-free ceramsite has the characteristics of ammonia nitrogen adsorption, slow release alkali source and rapid reoxygenation, a biological membrane is easy to hang on the ceramsite, each ceramsite can be used as an independent nitrification unit, a nitrification coupling effect is formed, the nitrification reaction time is shortened, and the nitrification rate is improved.
Description
Technical Field
The invention relates to the field of waste (sewage) water treatment, in particular to a percolation biochemical treatment system applied to strengthening the denitrification of a percolation system.
Background
In recent years, with the rapid development of economy in China and the deep promotion of industrialization, urbanization and agricultural modernization, more and more waste (sewage) water is generated, and the living environment is seriously influenced. The ammonia nitrogen in the wastewater mainly comprises two types, namely ammonia nitrogen formed by ammonia water, and ammonia nitrogen formed by inorganic ammonia, mainly ammonium sulfate, ammonium chloride and the like. Generally divided into four categories: organic nitrogen, ammonia nitrogen, nitrous Nitrogen (NO) 2 - ) And nitrate Nitrogen (NO) 3 - ). The natural surface water body and the underground water body are mainly nitrate Nitrogen (NO) 3 - ) Mainly comprises the following steps. The general formation of high ammonia nitrogen wastewater is caused by the coexistence of ammonia water and inorganic ammonia, generally, the main source of the ammonia nitrogen of the wastewater with the pH value above neutral is the combined action of the inorganic ammonia and the ammonia water, and the ammonia nitrogen in the wastewater under the acidic condition of the pH value is mainly caused by the inorganic ammonia. The high-concentration inorganic ammonia nitrogen is characterized in that: (1) The main pollutants are ammonia nitrogen and nitrate nitrogen, the content of the ammonia nitrogen and the nitrate nitrogen is high, the concentration range of the ammonia nitrogen is 40 mg/L-300 mg/L, and the concentration range of the nitrate nitrogen is 20 mg/L-40 mg/L; (2) Has very low organic carbon content and is substantially free ofPhosphorus, poor biodegradability; (3) The water quantity is large, and is from thousands of tons to ten thousands of tons every day; and (4) the ammonia nitrogen concentration fluctuation is obvious. At present, the following methods are mainly used for treating ammonia nitrogen: the traditional biological denitrification technology, ammonia stripping method, ion exchange method, breakpoint chlorine method and struvite precipitation method. The ammonia stripping method, the ion exchange method, the breakpoint chlorine method and the struvite precipitation method have the problems of large energy consumption, secondary pollution, high treatment cost and the like. The traditional biological denitrification technology has the defects that although the denitrification effect is good, the nitrification and denitrification are not suitable to be controlled, and the like.
The high-concentration inorganic ammonia nitrogen wastewater can be treated by a percolation system process, and organic pollutants, suspended matters and nitrogen and phosphorus in water are removed by a percolation bed system through adsorption and interception of fillers and microbial action under the general condition. Biological denitrification is an effective method for removing nitrogen in a polluted water body by a percolation bed system, the biological removal of the nitrogen comprises nitrification and denitrification processes, and the denitrification can be completely carried out by requiring sufficient organic carbon sources. The denitrification completely relying on biological action has the limitation, and particularly when the C/N ratio in water is lower, other forms of denitrification methods are required.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. The invention provides a percolation biochemical treatment system applied to strengthening the denitrification of a percolation system, and aims to solve the problem of unstable nitrification and denitrification in the percolation system.
In order to realize the purpose, the invention adopts the following technical scheme:
a percolation biochemical treatment system applied to strengthening the denitrification of a percolation system completes the denitrification effect through a nitrification percolation biochemical unit and a denitrification percolation biochemical unit of the percolation system;
the percolation biochemical treatment unit comprises a nitrification water-collecting tank, a nitrification percolation biochemical unit, a denitrification water-collecting tank and a denitrification percolation biochemical unit;
the nitrification water collecting tank is used for storing inorganic ammonia nitrogen wastewater and adjusting the water quantity and the water quality of the tank;
the nitrification and percolation biochemical unit is provided with a water distribution system, a temperature regulating and air supplying system and a water discharging system, and waste (sewage) water uniformly enters the nitrification and percolation biochemical unit through the water distribution system and passes through a nitrification composite biological filter material layer from top to bottom;
the nitrified composite biological filter material layer is formed by layering medium sand, coarse sand, ceramsite and cobblestone with different grades according to different proportions;
the ceramsite is non-sintered ceramsite and comprises the following raw materials in parts by weight: 15 parts of zeolite powder; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulfonate; 3 parts of cerium oxide.
The oxygen of the nitrification and percolation biochemical unit is derived from dissolved oxygen brought by the rare earth tail water, oxygen brought into the air in the percolation process, and oxygen provided by the blower in a layering and time-sharing manner;
the blower is layered and supplies oxygen in different periods, and the oxygen is supplied in a percolation drying stage;
in the nitrification and percolation biochemical unit, the volume ratios of the medium sand, the coarse sand, the ceramsite and the cobblestone are respectively as follows: 20-30:20-30:20-40:20;
the denitrification percolation biochemical unit is provided with a water distribution system and a drainage system, and the rare earth tail water after nitration enters the denitrification percolation biochemical unit through the water distribution system uniformly and passes through a denitrification composite biological filter material layer from top to bottom;
the denitrification composite biological filter material layer is formed by mixing layers of fine sand, siderite and stone coal with different grades and cobblestones according to different proportions in a layering manner;
in the denitrification percolation biochemical unit, the volume ratios of the fine sand, the mixed layer of siderite and stone coal and the cobblestones are respectively as follows: 25:55:20;
the temperature-regulating gas supply system is used for supplying oxygen to the nitrification and percolation biochemical unit;
the preparation method of the ceramsite comprises the following steps:
1) And (3) dry mixing of materials: weighing 15 parts of zeolite-containing powder according to the weight percentage; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulphonate; 3 parts of cerium oxide powder, adding into a ball mill stirrer, and stirring for 2-5 min.
2) And (3) granulation: putting the dry material into a granulating device, starting a disc granulator to granulate, and adding proper water or dry mixed material according to the dry and wet condition of the surface of the ceramsite in the granulating process, wherein the proper water mark on the surface of the ceramsite is preferred;
3) And (3) maintenance: and maintaining the ceramsite with the grain size meeting the requirement for 25-30 days at room temperature so as to fully hydrate the cement.
Compared with the prior art, the invention has the advantages and beneficial effects that:
firstly, the system of the invention has perfect unit design and strong adaptability; meanwhile, a multistage nitrification and percolation biochemical unit and a denitrification and percolation biochemical unit can be arranged according to the concentration of the ammonia nitrogen and the nitrate nitrogen in the inlet water, so that the effects of the whole treatment system and the treatment process are ensured.
Secondly, zeolite powder in the ceramsite in the nitrification and percolation biochemical unit adsorbs ammonia nitrogen, calcite provides an alkali source, and cerium oxide is used as an oxygen storage material, so that the non-sintered ceramsite has the characteristics of ammonia nitrogen adsorption, alkali source slow release and quick reoxygenation, a biological membrane is easy to hang on the ceramsite, each ceramsite can be used as an independent nitrification unit, a nitrification coupling effect is formed, the nitrification reaction time is shortened, and the nitrification rate is improved.
Thirdly, the oxygen sources in the nitration reaction process of the invention comprise dissolved oxygen brought by the oxygen source, oxygen brought into air in the percolation process and oxygen provided by a blower in a layered and sectional manner through an air supply system, the oxygen supply time period of the blower is carried out in the percolation drying stage, the blower can quickly oxygenate, the energy consumption is effectively reduced, and simultaneously the required wind pressure does not exceed 9800Pa, so the oxygen supply cost of the nitration reaction is far lower than the deepwater aeration cost adopted in the traditional treatment process.
Fourthly, the nitrification and percolation biochemical unit adopts multi-layer aeration, so that the oxygen utilization rate is greatly improved, the multi-layer aeration system relieves the problem of low biochemical temperature in winter, and the stable operation of nitrification is ensured.
Fifthly, the denitrification percolation biochemical unit uses stone coal as a carbon source and Fe in siderite 2+ Also used as electron donor to complete metabolism of autotrophic denitrifying bacteria in stone coal layerA denitrification reaction layer is easily formed in the siderite layer to reduce nitrate nitrogen in the polluted water body into N 2 。
Drawings
FIG. 1 is a schematic diagram of a diafiltration biochemical processing unit;
FIG. 2 is a schematic view of a bio-film coated ceramsite;
FIG. 3 is a graph showing the total nitrogen removal effect of a diafiltration biochemical treatment unit;
FIG. 4 is a schematic diagram of the ammonia nitrogen removal effect of the percolation biochemical treatment unit;
in the figure: 1. a lift pump; 2. an electromagnetic valve; 3. a fan; 4. a water distribution pipe; 5. an air duct; 6. sealing a soil layer; 7. a cobble layer; 8. a ceramic layer; 9. a coarse sand layer; 10. a fine sand layer; 11. nitrifying the supporting layer; 12. a nitrification water outlet pipe; 13. sealing a soil layer; 14. a cobble layer; 15. a nitration system solenoid valve; 16. a mixed layer of stone coal and siderite; 17. a fine sand layer; 18. a support layer; 19. a water distribution pipe; 20. a nitrification water collecting tank; 21. a denitrification water outlet pipe; 22. a denitrification solenoid valve; 23. denitrification water collecting tank
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood and obvious, the technical solutions in the embodiments of the present invention are clearly and completely described below to further illustrate the invention, and obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments.
The inorganic ammonia nitrogen wastewater in the nitrification regulating tank and the denitrification percolation biochemical unit is lifted to the nitrification percolation biochemical unit and the denitrification percolation biochemical unit for uniform water distribution through a lifting pump in an intermittent, timed and quantitative or continuous mode, flows into the denitrification water collecting tank through a nitrification water outlet pipe, and then enters the denitrification percolation biochemical unit through the lifting pump.
The biochemical unit of nitrification and percolation is mainly two-layer reverse reactionThe structure comprises a soil covering layer 6, a cobblestone water distribution layer 7, a ceramsite reaction layer 8, a coarse sand purification layer 9, a middle sand gas distribution layer 10, a second cobblestone layer 7, a second ceramsite reaction layer 8, a second coarse sand purification layer 9, a middle sand gas distribution layer 10, a sealing layer 11 and a nitrification system water outlet pipe 12 which are sequentially arranged from top to bottom. Inorganic ammonia nitrogen wastewater passes through a lift pump 1 and an electromagnetic valve 2, and is uniformly distributed on the nitrification and percolation surface through a nitrification and influent water distribution system 4 in a time-sharing, subsection, timing and quantitative manner; the uniformly distributed inorganic ammonia nitrogen wastewater slowly passes through the ceramsite reaction layer 8 from top to bottom, the zeolite powder in the ceramsite firstly intercepts and adsorbs ammonia nitrogen, and the ammonia nitrogen is converted into nitrate nitrogen through the nitrification reaction of a large amount of nitrifying bacteria attached to the ceramsite reaction layer 8, so that the concentration of the ammonia nitrogen is reduced; oxygen required by the nitration reaction is provided by the blower 3, and the oxygen is provided for the ceramsite reaction layer 8 in a time-sharing, sectional, timed and quantitative manner; and changing the wind pressure to provide a heat source for the nitrification and percolation system under the low-temperature condition. According to different water quality of inlet water and water quality of outlet water, the filler load of the nitrified composite biological filter material is 60-150gNH 4 + -N/m 3 D.
The denitrification percolation biochemical unit mainly has a two-layer reaction structure, and is sequentially provided with a soil covering layer 13, a cobblestone water distribution layer 14, a stone coal layer siderite mixing layer 16, a fine sand purification layer 17, a second cobblestone water distribution layer 14, a second stone coal siderite mixing layer 16, a fine sand purification layer 17, a sealing layer 18 and a denitrification system water outlet pipe 21 from top to bottom. The effluent after nitrification passes through a lift pump 1 and an electromagnetic valve 2, and is uniformly distributed on the denitrification percolation surface (a stone coal layer 15 and an siderite layer 16) through a nitrification water inlet distribution system 13 in a time-sharing, subsection, timing and quantitative manner; the uniformly distributed nitrified effluent slowly passes through the coal seam 15 and the siderite layer 16 from top to bottom, and nitrate nitrogen is converted into nitrogen gas through denitrification reaction under the action of a large amount of denitrifying bacteria, so that the total nitrogen concentration is reduced; the inorganic ammonia nitrogen wastewater permeating through the stone coal siderite mixed layer 16 from top to bottom is discharged in a timed and quantitative manner from a denitrification effluent water collecting system 21 arranged at the bottom of the denitrification percolation biochemical unit through intermittent opening and closing of a denitrification effluent electromagnetic valve 22. According to different water quality of inlet water and water quality of outlet water, denitrifyingThe filler load of the composite biological filter material is 30-80gNO 3 --N/m 3 D.
The treatment process of the inorganic ammonia nitrogen pollution percolation biochemical system is as follows, the invention is further explained by combining specific embodiments.
Example 1
As shown in fig. 1, the percolation biochemical treatment system applied to enhance the denitrification of the percolation system of the invention comprises a nitrification water collecting tank, a nitrification percolation biochemical unit, a denitrification water collecting tank and a denitrification percolation biochemical unit, wherein inorganic ammonia nitrogen wastewater in the nitrification water collecting tank is intermittently lifted to the nitrification percolation biochemical unit at regular time and quantity or continuously by a lifting pump, flows into the denitrification water collecting tank through a nitrification water outlet pipe, and then enters the denitrification percolation biochemical unit through the lifting pump;
the nitrification and percolation biochemical unit mainly has a two-layer reaction structure, and is sequentially provided with a soil covering layer 6, a cobblestone water distribution layer 7, a ceramsite reaction layer 8, a coarse sand purification layer 9, a middle cobblestone gas distribution layer 10, a second cobblestone layer 7, a second ceramsite reaction layer 8, a second coarse sand purification layer 9, a middle cobblestone gas distribution layer 10, a sealing layer 11 and a nitrification system water outlet pipe 12 from top to bottom. Inorganic ammonia nitrogen wastewater passes through a lift pump 1 and an electromagnetic valve 2, and is uniformly distributed on the nitrification and percolation surface through a nitrification and influent water distribution system 4 in a time-sharing, subsection, timing and quantitative manner; the uniformly distributed inorganic ammonia nitrogen wastewater slowly passes through the ceramsite reaction layer 8 from top to bottom, the zeolite powder in the ceramsite firstly intercepts and adsorbs ammonia nitrogen, and the ammonia nitrogen is converted into nitrate nitrogen through the nitrification reaction of a large amount of nitrifying bacteria attached to the ceramsite reaction layer 8, so that the concentration of the ammonia nitrogen is reduced; oxygen required by the nitration reaction is provided by the blower 3, and the oxygen is provided for the ceramsite reaction layer 8 in a time-sharing, sectional, timed and quantitative manner; the wastewater after the nitration reaction enters the denitrification water collecting tank 23 through the nitration water outlet pipe 12 and enters the denitrification water collecting tank 23 in a time-sharing and sectional manner through the electromagnetic valve 15.
The main body of the nitrification and percolation biochemical unit is a box body, the length, the width and the height are respectively 2m multiplied by 1.5m multiplied by 2.2m, and the main body of the nitrification and percolation biochemical unit can be made of organic glass plates. The water entering the nitrification and percolation biochemical unit percolates from top to bottom, the thickness of the soil covering layer 6 is 10cm, and the thickness of the supporting layer 11 is 10cm;
the reaction system of the nitrification and percolation biochemical unit is divided into two layers, and the volume ratio of the medium sand, the coarse sand, the ceramsite and the cobblestone in each layer is respectively as follows: 20:20:40:20;
the ceramsite is non-sintered ceramsite and comprises the following raw materials in parts by weight: 15 parts of zeolite powder; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulfonate; 3 parts of cerium oxide.
The preparation method of the ceramsite comprises the following steps:
1) Dry mixing of materials: weighing 15 parts of zeolite-containing powder according to the weight percentage; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulfonate; 3 parts of cerium oxide powder, adding into a ball mill stirrer, and stirring for 2-5 min.
2) And (3) granulation: putting the dry material into a granulating device, starting a disc granulator to granulate, and adding proper water or dry mixed material according to the dry and wet condition of the surface of the ceramsite in the granulating process, wherein the proper water mark on the surface of the ceramsite is preferred;
3) And (5) maintenance: and maintaining the ceramsite with the grain size meeting the requirement for 25-30 days at room temperature so as to fully hydrate the cement.
The nitrified inorganic ammonia nitrogen effluent is pumped into a denitrification percolation biochemical unit through a lift pump, the denitrification percolation biochemical unit mainly has a two-layer reaction structure, and a soil covering layer 13, a cobblestone water distribution layer 14, a mixed layer 16 of a stone coal layer and siderite, a fine sand purification layer 17, a cobblestone water distribution layer 14 of a second layer, a mixed layer 16 of stone coal and siderite of the second layer, a fine sand purification layer 17, a sealing layer 18 and a denitrification system water outlet pipe 21 are sequentially arranged from top to bottom. The effluent after nitrification passes through a lift pump 1 and an electromagnetic valve 2, and is uniformly distributed on the denitrification percolation surface (a mixed layer 16 of a stone coal bed and siderite) through a nitrification water inlet distribution system 13 in a time-sharing, subsection, timing and quantitative manner; the uniformly distributed nitrified effluent slowly passes through the stone coal layer and the siderite mixed layer 16 from top to bottom, and nitrate nitrogen is converted into nitrogen through denitrification reaction under the action of a large amount of denitrifying bacteria, so that the total nitrogen concentration is reduced; the inorganic ammonia nitrogen wastewater permeating through the mixed layer 16 of the coal seam and the siderite from top to bottom is discharged from a denitrification water outlet pipe 21 arranged at the bottom of the denitrification percolation biochemical unit in a timed and quantitative manner through the intermittent opening and closing of a denitrification water outlet electromagnetic valve 22.
The main body of the denitrification percolation biochemical unit is a box body, the length, the width and the height are respectively 2m multiplied by 1.5m multiplied by 2.2m, and the main body of the denitrification percolation biochemical unit can be made of organic glass plates. The water entering the denitrification percolation biochemical unit percolates from top to bottom, the thickness of the soil covering layer 13 is 10cm, and the thickness of the supporting layer 18 is 10cm;
the reaction system of the denitrification percolation biochemical unit is divided into two layers, and the volume ratio of the fine sand to the mixed layer of the stone coal and siderite powder and the cobblestones in each layer is respectively as follows: 25:55:20;
the volume ratio of the stone coal to the siderite powder in the stone coal siderite powder mixed layer of the denitrification percolation biochemical unit is 2;
during operation, water to be treated enters the nitrification percolation biochemical unit and the denitrification percolation biochemical unit through the reservoir and the water inlet pump and is discharged through the denitrification water outlet pipe 21.
Example 2
As shown in figure 1, the percolation biochemical treatment system applied to enhance the denitrification of the percolation system comprises a nitrification water collecting tank, a nitrification percolation biochemical unit, a denitrification water collecting tank and a denitrification percolation biochemical unit, wherein inorganic ammonia nitrogen wastewater in the nitrification water collecting tank is intermittently, regularly, quantitatively or continuously lifted to the nitrification percolation biochemical unit by a lifting pump, flows into the denitrification water collecting tank through a nitrification water outlet pipe, and then enters the denitrification percolation biochemical unit through the lifting pump.
The nitrification and percolation biochemical unit mainly has a two-layer reaction structure, and is sequentially provided with a soil covering layer 6, a cobblestone water distribution layer 7, a ceramsite reaction layer 8, a coarse sand purification layer 9, a middle cobblestone gas distribution layer 10, a second cobblestone layer 7, a second ceramsite reaction layer 8, a second coarse sand purification layer 9, a middle cobblestone gas distribution layer 10, a sealing layer 11 and a nitrification system water outlet pipe 12 from top to bottom. Inorganic ammonia nitrogen wastewater passes through a lift pump 1 and an electromagnetic valve 2, and is uniformly distributed on the nitrification and percolation surface through a nitrification and influent water distribution system 4 in a time-sharing, subsection, timing and quantitative manner; the uniformly distributed inorganic ammonia nitrogen wastewater slowly passes through the ceramsite reaction layer 8 from top to bottom, the zeolite powder in the ceramsite firstly intercepts and adsorbs ammonia nitrogen, and the ammonia nitrogen is converted into nitrate nitrogen through nitration reaction by a large amount of nitrifying bacteria attached to the ceramsite reaction layer 8, so that the concentration of the ammonia nitrogen is reduced; oxygen required by the nitration reaction is provided by the blower 3, and the oxygen is provided for the ceramsite reaction layer 8 in a time-sharing, sectional, timed and quantitative manner; the wastewater after the nitration reaction enters the denitrification water collecting tank 23 through the nitration water outlet pipe 12 and enters the denitrification water collecting tank 23 in a time-sharing and sectional manner through the electromagnetic valve 15.
The main body of the nitrification-percolation biochemical unit is a box body, the length, the width and the height are respectively 2m multiplied by 1.5m multiplied by 2.2m, and the main body of the nitrification-percolation biochemical unit can be made of organic glass plates. The water entering the nitrification and percolation biochemical unit percolates from top to bottom, the thickness of the soil covering layer 6 is 10cm, and the thickness of the supporting layer 11 is 10cm;
the reaction system of the nitrification and percolation biochemical unit is divided into two layers, wherein the volume ratio of the medium sand, the coarse sand, the ceramsite and the cobblestone in each layer is respectively as follows: 30:30:20:20;
the ceramsite is non-sintered ceramsite and comprises the following raw materials in parts by weight: 15 parts of zeolite powder; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulphonate; 3 parts of cerium oxide.
The preparation method of the ceramsite comprises the following steps:
1) And (3) dry mixing of materials: weighing 15 parts of zeolite-containing powder according to the weight percentage; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulfonate; 3 parts of cerium oxide powder, adding into a ball mill stirrer, and stirring for 2-5 min.
2) And (3) granulation: putting the dry material into a granulating device, starting a disc granulator to granulate, and adding proper water or dry mixed material according to the dry and wet condition of the surface of the ceramsite in the granulating process, wherein the proper water mark on the surface of the ceramsite is preferred;
3) And (3) maintenance: and maintaining the ceramsite with the grain size meeting the requirement for 25-30 days at room temperature so as to fully hydrate the cement.
The nitrified inorganic ammonia nitrogen effluent is pumped into a denitrification percolation biochemical unit through a lift pump, the denitrification percolation biochemical unit mainly has a two-layer reaction structure, and a soil covering layer 13, a cobblestone water distribution layer 14, a mixed layer 16 of a stone coal layer and siderite, a fine sand purification layer 17, a cobblestone water distribution layer 14 of a second layer, a mixed layer 16 of stone coal and siderite of the second layer, a fine sand purification layer 17, a sealing layer 18 and a denitrification system water outlet pipe 21 are sequentially arranged from top to bottom. The effluent after nitrification passes through a lift pump 1 and an electromagnetic valve 2, and is uniformly distributed on the denitrification percolation surface (a mixed layer 16 of a stone coal bed and siderite) through a nitrification water inlet distribution system 13 in a time-sharing, subsection, timing and quantitative manner; the uniformly distributed nitrified effluent slowly passes through the stone coal layer and the siderite mixed layer 16 from top to bottom, and nitrate nitrogen is converted into nitrogen through denitrification reaction under the action of a large amount of denitrifying bacteria, so that the total nitrogen concentration is reduced; the inorganic ammonia nitrogen wastewater permeating through the mixed layer 16 of the coal seam and the siderite from top to bottom is discharged from a denitrification water outlet pipe 21 arranged at the bottom of the denitrification percolation biochemical unit in a timed and quantitative manner through the intermittent opening and closing of a denitrification water outlet electromagnetic valve 22.
The main body of the denitrification percolation biochemical unit is a box body, the length, the width and the height are respectively 2m multiplied by 1.5m multiplied by 2.2m, and the main body of the denitrification percolation biochemical unit can be made of organic glass plates. The water entering the denitrification percolation biochemical unit percolates from top to bottom, the thickness of the soil covering layer 13 is 10cm, and the thickness of the supporting layer 18 is 10cm;
the reaction system of the denitrification percolation biochemical unit is divided into two layers, and the volume ratio of the fine sand to the mixed layer of the stone coal and siderite powder and the cobblestones in each layer is respectively as follows: 25:55:20;
the volume ratio of the stone coal to the siderite powder in the stone coal siderite powder mixed layer of the denitrification percolation biochemical unit is 2;
during operation, water to be treated enters the nitrification percolation biochemical unit and the denitrification percolation biochemical unit through the reservoir and the water inlet pump and is discharged through the denitrification water outlet pipe 21.
With reference to the embodiment 1 and the embodiment 2, as shown in fig. 3 and 4, the inlet water quality is 140-190 mg/L of total nitrogen, 100-150 mg/L of ammonia nitrogen, and 15-25 mg/L of COD, the hydraulic retention time is 6 hours, after the treatment of the percolation biochemical treatment unit, the total nitrogen removal rate is over 86%, the ammonia nitrogen removal rate is over 88%, and the COD outlet water is basically maintained.
Having thus described the principal technical features and basic principles of the invention, and the advantages associated therewith, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description is described in terms of various embodiments, not every embodiment includes only a single embodiment, and such descriptions are provided for clarity only, and those skilled in the art will recognize that the embodiments described herein can be combined as a whole to form other embodiments as would be understood by those skilled in the art.
Claims (6)
1. A percolation biochemical treatment system applied to strengthening the denitrification of a percolation system finishes the denitrification function through a nitrification percolation biochemical unit and a denitrification percolation biochemical unit of the percolation system; the method is characterized in that: the percolation biochemical treatment system comprises a nitrification water collecting tank, a nitrification percolation biochemical unit, a denitrification water collecting tank and a denitrification percolation biochemical unit; the nitrification and percolation biochemical unit is provided with a water distribution system, an air supply system and a drainage system; the waste/sewage uniformly enters the nitrification and percolation biochemical unit through the water distribution system and passes through the filter material layer from top to bottom; the filter material layer of the nitrification and percolation biochemical unit is composed of medium sand, coarse sand, ceramsite and cobblestone with different grades according to different proportions and layers; the ceramsite is non-sintered ceramsite and comprises the following raw materials in parts by weight: 15 parts of zeolite powder; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulfonate; 3 parts of cerium oxide; the ceramsite is prepared by the following steps: 1) Dry mixing of materials: weighing 15 parts of zeolite powder according to weight percentage; 30 parts of fly ash; 16 parts of cement; 33 parts of calcite powder; 2 parts of gypsum powder; 1 part of calcium lignosulfonate; adding 3 parts of cerium oxide powder into a ball mill mixer, and stirring for 2-5 min; 2) And (3) granulation: putting the dry material into a granulating device, starting a disc granulator to granulate, and adding proper water or dry mixed material according to the dry and wet condition of the surface of the ceramsite in the granulating process, wherein the proper water mark on the surface of the ceramsite is preferred; 3) And (5) maintenance: and maintaining the ceramsite with the grain size meeting the requirement for 25-30 days at room temperature so as to fully hydrate the cement.
2. The diafiltration module according to claim 1, wherein the diafiltration module is further configured to provide a second permeate stream to the diafiltration module for enhanced denitrification by the diafiltration module: the oxygen of the nitrification and percolation biochemical unit is derived from dissolved oxygen brought by the rare earth tail water, oxygen brought into the air in the percolation process, and oxygen provided by the blower in a layering and time-sharing manner.
3. A diafiltration module according to claim 2 wherein the module further comprises: the blower is layered and supplies oxygen in different periods, and the oxygen is supplied in a percolation drying stage.
4. A diafiltration module according to claim 1 wherein the module further comprises: in the nitrification and percolation biochemical unit, the volume ratios of the medium sand, the coarse sand, the ceramsite and the cobblestone are respectively as follows: 20-30:20-30:20-40:20.
5. a diafiltration module according to claim 1 wherein the module further comprises: the denitrification percolation biochemical unit is provided with a water distribution system and a drainage system, and the rare earth tail water after nitration enters the denitrification percolation biochemical unit through the water distribution system uniformly and passes through a filter material layer from top to bottom; the filter material layer of the denitrification percolation biochemical unit is composed of fine sand, a mixed layer of siderite and stone coal and cobblestones which are in different grades according to different proportions and layers.
6. A diafiltration module according to claim 5 wherein the module further comprises: in the denitrification percolation biochemical unit, the volume ratios of the fine sand, the siderite and stone coal mixed layer and the cobblestone are respectively as follows: 25:55:20.
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