CN109851167B - Biological trickling filter, high-load biological trickling filter combined landscape filter bed system and process - Google Patents

Biological trickling filter, high-load biological trickling filter combined landscape filter bed system and process Download PDF

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CN109851167B
CN109851167B CN201910101118.6A CN201910101118A CN109851167B CN 109851167 B CN109851167 B CN 109851167B CN 201910101118 A CN201910101118 A CN 201910101118A CN 109851167 B CN109851167 B CN 109851167B
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filter
sewage
tower
trickling filter
biological trickling
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CN109851167A (en
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李永涛
张振
刘梦雪
张坤
曾非凡
王进进
石丹丹
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South China Agricultural University
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South China Agricultural University
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Abstract

The biological trickling filter comprises an aerobic section, an anoxic section and a dephosphorization section which are sequentially arranged from top to bottom, and a water distributor is arranged above the aerobic section; the main structure of the biological trickling filter is in a tower-shaped structure; the upper section of the tower-shaped structure is provided with independent multi-layer shale units, the top of the tower-shaped structure is open, and the side wall of the upper section of the tower-shaped structure is provided with vent holes so as to form an aerobic section; the middle section of the tower-shaped structure is provided with independent multilayer pumice units, and the middle section of the tower-shaped structure is closed, so that an anoxic section is formed; the lower section of the tower-shaped structure is internally provided with independent multi-layer broken brick units, the bottom of the tower-shaped structure is open, and the side wall of the lower section of the tower-shaped structure is provided with a vent hole, so that a phosphorus removal section is formed. A high-load biological trickling filtration combined landscape filter bed system. A high-load biological trickling filtration combined landscape filter bed process. The invention has the advantages of high purification efficiency, low cost, stable operation and the like. The invention belongs to the technical field of sewage purification.

Description

Biological trickling filter, high-load biological trickling filter combined landscape filter bed system and process
Technical Field
The invention belongs to the technical field of sewage purification, and particularly relates to a biological trickling filter, a high-load biological trickling filter combined landscape filter bed system and a process.
Background
The bio-trickling filter is generally adopted when sewage is treated at the present stage. When the biological trickling filter is used for purifying sewage, although the treatment effect can reach the national standard (secondary standard), a plurality of places which can be improved still exist. For example, the sewage is pretreated when being sprayed into the biological trickling filter, and the pretreatment only adjusts the water quality and the water quantity uniformly, so that the purification effect is reduced to a certain extent; moreover, the water purified from the biological trickling filter is not subjected to subsequent treatment and is directly discharged, the discharged water quality cannot reach the first-class B or even the first-class A standard, and the standard is improved from the second-class standard to the first-class B or even the first-class A standard in more and more areas at the present stage, so that the traditional biological trickling filter is difficult to reach the discharge standard. The existing biological trickling filter is internally provided with a zeolite layer and a pebble layer, an iron scrap layer is arranged in the zeolite layer, and microorganisms form a biological biofilm in the zeolite layer, so that organic matters, nitrogen and ammonia substances and the like in sewage are digested and decomposed, the nitrogen-containing substances are further decomposed by utilizing the denitrification of the middle layer of the biological trickling filter relative to an anoxic environment, and phosphorus is removed under the action of the iron scrap layer. The biological trickling filter is contacted with air at the top layer and the bottom layer, a relatively anoxic environment is formed in the middle part, but dissolved oxygen still exists in the middle part of the trickling filter because the oxygen is dissolved in water, so that the denitrification effect is influenced to a certain extent, and the purification efficiency is also influenced; secondly, the zeolite layer and the scrap iron layer are arranged adjacently, and due to the disordered arrangement of the zeolite and the disordered arrangement of the scrap iron, the flow guide effect between the layers is poor, and the sewage is splashed disorderly and distributed unevenly in the trickling filtration process; moreover, the biological membrane-hanging capacity and the adsorption capacity of the zeolite are relatively common.
Disclosure of Invention
In order to solve the problems, the invention provides the biological trickling filter with higher purification efficiency.
The second purpose of the invention is to provide a high-load biological trickling filter combined landscape filter bed system with high purification efficiency, low cost and stable operation.
The third purpose of the invention is to provide a high-load biological trickling filter combined landscape filter bed process with high purification efficiency and low cost.
The biological trickling filter comprises an aerobic section, an anoxic section and a dephosphorization section which are sequentially arranged from top to bottom, and a water distributor is arranged above the aerobic section; the main structure of the biological trickling filter is in a tower-shaped structure; the upper section of the tower-shaped structure is provided with independent multi-layer shale units, the top of the tower-shaped structure is open, and the side wall of the upper section of the tower-shaped structure is provided with vent holes so as to form an aerobic section; the middle section of the tower-shaped structure is provided with independent multilayer pumice units, and the middle section of the tower-shaped structure is closed, so that an anoxic section is formed; the lower section of the tower-shaped structure is internally provided with independent multi-layer broken brick units, the bottom of the tower-shaped structure is open, and the side wall of the lower section of the tower-shaped structure is provided with a vent hole, so that a phosphorus removal section is formed.
Preferably, a combined fiber packing layer is arranged among all units in the aerobic section, the anoxic section and the phosphorus removal section, and a combined fiber packing layer is also arranged among the anoxic section, the aerobic section and the phosphorus removal section.
Preferably, a plurality of grid type support brackets are arranged in the aerobic section, the anoxic section and the dephosphorization section, the grid type support brackets of the aerobic section are filled with shale, the grid type support brackets of the anoxic section are filled with pumice, and the grid type support brackets of the dephosphorization section are filled with broken bricks.
A high-load bio-trickling filter combined landscape filter bed system adopts any one of the bio-trickling filters, and further comprises a pretreatment unit and a depth treatment unit, wherein the pretreatment unit is arranged at the bottom of the bio-trickling filter and is connected with the top of the bio-trickling filter through a water pump and a pipeline; the depth processing unit is also arranged at the bottom of the biological trickling filter, and the main body structure of the depth processing unit is annularly distributed at the periphery of the biological trickling filter.
Preferably, the deep treatment unit is a landscape filter bed, the landscape filter bed comprises a sedimentation tank and an annular filter bed main body, the sedimentation tank is arranged on one side of the biological trickling filter tower, a water outlet at the bottom of the biological trickling filter tower faces the sedimentation tank, the annular filter bed main body is annularly distributed on the periphery of the biological trickling filter tower, and the sedimentation tank is connected with the annular filter bed main body through a water distribution channel.
Preferably, the annular filter bed main body comprises a filler layer, a cultivated layer and a greening layer from bottom to top, the filler layer is filled with the crushed bricks and the pumice, the cultivated layer is used for planting the flower plants, and the flower plants form the greening layer.
Preferably, the water distribution channel is connected with the lower part of the annular filter bed main body, and the water outlet of the annular filter bed main body is arranged at the upper part.
Preferably, the pretreatment unit comprises a grid well and an adjusting tank, the grid well is communicated with the adjusting tank, a filler reaction wall is arranged in the adjusting tank, and a filler of the filler reaction wall is pumice.
A high-load biological trickling filtration combined landscape filter bed process comprises the following steps:
(1) inputting the sewage into a pretreatment unit for pretreatment, wherein the pretreatment comprises intercepting large-particle sewage garbage and improving the C/N ratio of the sewage;
(2) inputting the sewage treated in the step (1) into a biological trickling filter for microbial purification, wherein the microbial purification comprises nitrification in an aerobic section of the biological trickling filter to treat most organic matters and nitrogen ammonia substances in the sewage, denitrification in an anoxic section of the biological trickling filter to further treat nitrogen-containing substances, treatment of organic phosphorus and inorganic phosphorus in the sewage in a phosphorus removal section of the biological trickling filter, and then conveying the sewage to a landscape filter bed;
(3) and (3) inputting the sewage treated in the step (2) into a landscape filter bed for further advanced treatment.
Preferably, in the step (1), large-particle sewage garbage is intercepted through a grating well, and the C/N ratio of the sewage is improved through an adjusting tank internally provided with a filler reaction wall; in the step (3), the sewage is further deeply filtered and purified through the filler layer and the cultivation layer inside the landscape filter bed.
The invention has the beneficial effects that:
1. the pretreatment unit is provided with a grating well for intercepting large-particle sewage garbage; and then the nitrogen in the sewage can be removed in advance by adjusting the setting of the filler reaction wall aiming at removing the nitrogen in the tank, so that the problem of poor biochemical effect in a biochemical treatment unit caused by too low C/N ratio of the domestic sewage is solved.
2. The biological trickling filter adopts a sectional type structural design, combines organic combination of three functional fillers, and sequentially sets the biological trickling filter into an aerobic section, an anoxic section and a dephosphorization section from top to bottom, wherein the aerobic section taking shale as the filler mainly aims at removing organic pollutants and ammonia nitrogen under the nitration action; the nitrate nitrogen generated by nitrification is further removed through denitrification of an anoxic section which takes the pumice as a filler, and meanwhile, the residual organic pollutants in the last nitrification treatment stage can also be further removed in the anoxic section; the phosphorus in the sewage can be efficiently removed through the biological action of phosphorus accumulating bacteria in a phosphorus removal section taking the broken bricks as the fillers and the adsorption action of the broken brick fillers on the phosphorus; in addition, the lowermost layer of the trickling filtration tower adopts small-particle broken brick filler, so that solid suspended matters in sewage can be effectively filtered while phosphorus is adsorbed and removed, and biological films and the like falling from the upper layer are intercepted; according to the invention, a complete nitrification-denitrification system is formed by the arrangement of the aerobic section and the anoxic section, and the system can effectively improve the treatment efficiency of organic matters and total nitrogen in sewage; the anoxic section and the phosphorus removal are arranged to form a complete system of phosphorus release-phosphorus accumulation, and the system can effectively improve the removal efficiency of the total phosphorus in the sewage; and the arrangement of the oxygen/oxygen deficiency section and the phosphorus removal section forms a biological/adsorption-adsorption/filtration treatment system.
3. The three fillers related by the invention are not traditional biological filter fillers, and comprise two kinds of rocks which are widely distributed and have not been fully developed in application, namely shale and pumice, and a building waste, namely broken bricks; from the functional point of view, the three fillers complement each other and act together to form an organic whole: the shale has strong biofilm formation capability and is rich in trace mineral elements required by microorganisms, the nitrification of the microorganisms in an aerobic section is facilitated, a part of organic pollutants in the sewage is degraded and removed under the nitrification, and ammonia nitrogen is converted into nitrate nitrogen under the nitrification; the next layer of the pumice can effectively adsorb nitrate nitrogen in the sewage, the total nitrogen of the effluent is effectively controlled by combining the denitrification of microorganisms, and organic pollutants are further removed by combining the action of the pumice and the microorganisms; the crushed bricks have excellent phosphorus adsorption capacity, so that the total phosphorus in the effluent can be controlled in a phosphorus removal section, and meanwhile, the small-particle crushed bricks can effectively intercept microbial films falling off from the upper-layer shale packing and the pumice packing; the three fillers are easy to obtain and low in price, and the waste materials or the rock which is not fully developed are recycled, so that the environment and economic benefits are achieved;
4. the landscape filter bed is innovatively designed into an annular main body, sewage flows in an annular (circular) manner around the regulating tank and the biological trickling filter, and meanwhile, the inside of the landscape filter bed adopts a compound flow manner, so that the occupied area of the landscape filter bed is far smaller than that of the traditional wetland by means of water inlet from the lower part and water outlet from the upper part, partition walls and the like, and the sewage purification treatment with sufficient duration and better effect is achieved; meanwhile, the annular filter bed system is distributed around the biological trickling filter and matched with wetland plants, so that the landscape effect is obviously improved, and the system is more attractive than the traditional sewage treatment station and is integrated with the surrounding environment; besides the plants arranged on the upper layer, the filter bed system is also provided with mixed filler taking broken bricks and pumice as main bodies on the lower layer, and nitrogen and phosphorus are further adsorbed by the filler layer and the planting layer to deeply treat sewage.
5. The invention also has the following advantages: a. the space is small: the occupied area of the technical process is reduced by about 70 percent compared with the traditional treatment process, the occupied area of a wetland system is generally four times of the sewage treatment scale, and the occupied area can be reduced to 1.2 times of the sewage treatment scale by the process provided by the invention; b. the load is high: the organic load of the traditional trickling filter is generally less than 0.15-0.3kg BOD/m3D, the high-efficiency biological trickling filtration tower process related by the invention can reach 1kg BOD/m3D; c. the cost is low: the running cost of the traditional treatment process is generally more than 0.4 yuan/m3D, the technique may be less than 0.1 yuan/m3D, the project is stable in operation, maintenance personnel are hardly needed, and the operation cost is further reduced; d. the efficiency is high: the effluent quality of the traditional treatment process can only reach the second grade generally, and the effluent quality of the technical process can reach the first grade A standard; e. the operation is stable: the operation and maintenance of most of the traditional processes requires more workers and is difficult to operate and maintain, and the project almost does not need the workers and the sludge discharge, is easy to operate and can stably operate for a long time.
Drawings
FIG. 1 is a schematic view of a high load bio-trickling filter combined landscape filter system according to the present invention.
FIG. 2 is a schematic top view of a high load bio-trickling filter in combination with a landscape filter bed system of the present invention.
FIG. 3 is a graph showing the change of suspended matter content with time in the water treatment of the present invention.
FIG. 4 shows COD in water treatment according to the present inventionCrGraph of the content as a function of time.
FIG. 5 shows BOD in the treatment of water in the present invention5Graph of the content as a function of time.
FIG. 6 is a graph showing the change of ammonia nitrogen content with time in the water treatment of the present invention.
FIG. 7 is a graph showing the change of total nitrogen content with time in the water treatment according to the present invention.
FIG. 8 is a graph showing the change of total phosphorus content with time in water treatment according to the present invention.
The biological trickling filter comprises a 1-biological trickling filter, a 2-aerobic section, a 3-anoxic section, a 4-dephosphorization section, a 5-landscape filter bed, a 6-grid well, a 7-regulating tank, an 8-filler reaction wall, a 9-pretreatment unit, a 10-sedimentation tank, an 11-greening layer, a 12-broken brick unit, a 13-combined fiber filler, a 14-pumice unit, a 15-shale unit, a 16-water distributor, a 17-water distribution channel, an 18-cultivation layer and a 19-filler layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The direction of the arrows on the biotrickling filter in fig. 1 is the direction of air flow, and the directions of the other arrows in fig. 1 are the directions of water flow; the direction of the arrows in fig. 1 is the direction of water flow.
A high-load biological trickling filtration combined landscape filter bed system comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit. The sewage flows through the pretreatment unit for pretreatment, then is input into the top of the biochemical treatment unit, and is purified by the biochemical treatment unit flowing downwards, and then is input into the advanced treatment unit for advanced treatment of organic pollutants, nitrogen and phosphorus in the sewage, and finally is discharged.
The pretreatment unit comprises a grating and an adjusting tank which are connected in sequence. A layer of filler reaction wall is arranged in the adjusting tank, and the filler of the filler reaction wall is pumice. Water enters from the grating and then enters the regulating tank, and the water passing through the regulating tank is pumped to the top end of the biochemical treatment unit. And intercepting large-particle sewage garbage through the grating. The adjusting tank removes nitrogen in the sewage in advance, and since the C/N of the domestic sewage is too low, the nitrogen is removed in advance through the filler reaction wall, so that the improvement of the C/N of the sewage is facilitated, and the biochemical treatment effect of a subsequent biochemical treatment unit is improved.
The biochemical treatment unit is a biological trickling filtration tower. The biological trickling filter comprises an aerobic section, an anoxic section and a phosphorus removal section which are connected in sequence, the main structure of the biological trickling filter is in a tower-shaped structure, the aerobic section, the anoxic section and the phosphorus removal section are sequentially arranged in the tower-shaped structure from top to bottom, and the aerobic section, the anoxic section and the phosphorus removal section all comprise a plurality of independent units. And a water distributor is arranged at the top end of the aerobic section, and water output from the regulating tank is conveyed to the water distributor through a pipeline and then sprayed onto the aerobic section through the water distributor. The aerobic section comprises a plurality of layers of shale units which are connected in sequence, each layer of shale unit adopts a grid type bearing bracket, and the grid type bearing bracket is filled with shale; and combined fiber fillers are filled between each layer of shale units. The top of tower-shaped structure is opened, the top of aerobic section is opened, and the lateral wall of the upper section of tower-shaped structure is provided with a plurality of ventilation holes. The oxygen supply of the aerobic section is sufficient through the opening at the top and the ventilation holes at the periphery, the conventional mechanical aeration is not needed, and the operation energy consumption is saved. The clay characteristic of the shale makes the filler have ideal microorganism biofilm formation capability, the microorganism biofilm formation capability is strong, the shale is rich in mineral elements and is beneficial to promoting the activity of microorganisms, and the shale is subjected to biofilm formation by using the acclimated and aerated aerobic activated sludge and is beneficial to the quick start of the filter tank. The anoxic section comprises a plurality of layers of pumice units which are arranged in sequence, combined fiber filler is filled between each side pumice unit, and pumice is filled in each pumice unit. The top and the bottom of the anoxic section are isolated from the upper and the lower sections (the aerobic section and the dephosphorization section) by filling combined fiber fillers. The side walls of the middle section of the tower-shaped structure and the periphery of the anoxic section are completely sealed, so that the anoxic section forms a closed structure; oxygen deficiency favors the production of NO in the aerobic section3 -Further removed by denitrification in this stage, the pumice as filler has strong adsorption capacity to nitrogen, which is obviously superior to other traditional fillers, for exampleVolcanic rock, ceramsite and the like, and pumice has the function of adsorbing nitrogen and simultaneously promotes the electron transfer function in the microbial metabolism process. The dephosphorization section comprises a plurality of layers of broken brick units which are arranged in sequence, each layer of broken brick unit adopts a grid type support bracket, and each layer of grid type support bracket is filled with broken bricks; and combined fiber filler is filled between two adjacent layers of broken brick units. Broken brick can adsorb PO in sewage high-efficiently4 3-And ions are beneficial to the treatment of total phosphorus in the sewage. And the lower part of the dephosphorization section is opened, the bottom of the tower-shaped structure is opened, the side wall of the lower section of the tower-shaped structure is provided with a vent hole, and the anaerobic biomembrane dropped from the upper anoxic section has certain phosphorus accumulation capability under the aerobic condition through the open ventilation structure, thereby being beneficial to further removing the total phosphorus in the sewage. The biological trickling filtration tower organically combines the advantages of the fillers with the unique combination of 'open + closed + open' ('aerobic + anoxic + dephosphorization'), so that the advantages of the functional fillers are fully exerted; in addition, the biological trickling filter organically combines waste materials or insufficiently developed rocks and is connected with a novel trickling filter system in parallel, so that the development of a new technology of a biological filter can be promoted, the resource utilization of waste residues and waste materials is realized, and the effect of treating wastes with processes of wastes against one another is realized. On the whole, just by designing the functional filler, the combined fiber filler and the open + closed + open structure, the organic load of the high-efficiency biological trickling filter can be controlled from 0.15 to 0.3kg BOD/m3D is increased to 1kg BOD/m3D, the sewage treatment efficiency is obviously improved.
The combined fiber filler consists of a soft fiber bundle, a high polymer plastic ring sheet, a support sleeve and a central rope. The soft fiber bundles are uniformly distributed on the periphery of the plastic ring sheet in a unique perforation fixing mode, the fiber bundles cannot fall off, the phenomenon of central agglomeration of the filler is avoided, the central oxygen supply is improved, and the snowflake-shaped needling structure in the middle of the plastic ring sheet can play good roles in water distribution and gas distribution, so that the filler has the advantages of good mass transfer effect, high oxygen utilization rate, no blockage, impact resistance, stable treatment and the like. . The combined fiber fillers can play a role in draining sewage and effectively prevent the sewage from splashing and uneven distribution in the trickling filtration process; but also can make full use of the space gap, and the sewage is further treated by the biological film on the combined fiber filler in the drainage process.
In general, the biological trickling filter system technically and simultaneously absorbs the technical characteristics of efficient nitrogen and phosphorus removal in an A/O process, the technical characteristics of deep phosphorus removal in a sand filtration process and the interception of macromolecular solid particles and colloids in water, and the technical characteristics of no need of aeration, low energy consumption, small amount of residual sludge, no need of backwashing and the like of a trickling filter process, so that the novel biological trickling filter technology related by the invention has the technical advantages of multiple aspects for the conventional sewage treatment process at present, and can effectively realize the comprehensive and efficient treatment of domestic sewage.
The advanced treatment unit is a landscape filter bed and is used for carrying out advanced treatment on organic pollutants, nitrogen and phosphorus in the sewage. The landscape filter bed is annularly distributed around the biological trickling filter, namely the landscape filter bed annularly surrounds the biological trickling filter. The landscape filter bed comprises a sedimentation tank and an annular filter bed main body, wherein the sedimentation tank is arranged on one side of the biological trickling filter, a water outlet at the bottom of the biological trickling filter faces the sedimentation tank, the annular filter bed main body is annularly distributed on the periphery of the biological trickling filter, and the sedimentation tank is connected with the annular filter bed main body through a water distribution channel. The annular filter bed main body sequentially comprises a filler layer, a cultivation layer and a greening layer from bottom to top, the filler layer is filled with mixed filler taking broken bricks and pumice as main bodies, the cultivation layer is used for planting flower plants, and the greening part is used for planting the flower plants on the cultivation layer. The water distribution channel is connected with the lower part of the annular filter bed main body, and the water outlet of the annular filter bed main body is arranged at the upper part. The water body treated by the biological treatment unit enters the landscape filter bed, and the water body bypasses the annular landscape filter bed to form annular flow, so that the water body is further and fully filtered and purified, and the occupied area of the landscape filter bed arranged in an annular mode is far smaller than that of the driven wetland. When the water body flows in the landscape filter bed, the crushed bricks and the pumice in the filler layer further adsorb nitrogen and phosphorus to deeply treat the sewage. Through ploughing the planting layer and planting flower plant to be equipped with at afforestation layer combination flower plant (canna and iris), the view effect is showing and is promoting, makes this system more pleasing to the eye than traditional sewage treatment station, fuses as an organic whole with the surrounding environment.
The sewage forms a large annular flow through the regulating tank, the biological trickling filter and the landscape filter bed, the sewage is fully purified, and the whole system occupies a small area.
A high-load bio-trickling filter combined landscape filter bed process adopts the high-load bio-trickling filter combined landscape filter bed system, and comprises the following steps:
(1) pretreating sewage by a pretreatment unit: sewage firstly enters a grating well, and large-particle dirt garbage is intercepted and filtered through the grating well; the sewage enters the regulating tank from the grid well, and nitrogen is removed in advance through the filler reaction wall in the regulating tank, so that the C/N ratio in the sewage is improved.
(2) The sewage is subjected to biological purification treatment by a biological trickling filter: the water pretreated by the regulating tank is conveyed to the top of the biological trickling filter by a water pump and a pipeline, and sewage is sprayed above the aerobic section by a water distributor; when the sewage passes through the aerobic section, the sewage is biologically decomposed through a microorganism biofilm on the shale units, and most of organic matters and nitrogen and ammonia substances in the sewage are decomposed; the sewage is guided into the anoxic section through the combined fiber filler layer, and is subjected to denitrification treatment through the pumice unit in the anoxic section so as to further reduce the nitrogen content in the sewage; the treated sewage is led into a dephosphorization section through a combined fiber packing layer, and PO in the sewage can be efficiently adsorbed by broken bricks in the dephosphorization section4 3-The anaerobic biomembrane dropped from the upper anoxic section also has certain phosphorus accumulation capability under the aerobic condition of the phosphorus removal section, thereby realizing the effective removal of phosphorus in the sewage.
(3) The sewage is subjected to advanced treatment by an advanced treatment unit: the sewage treated by the biological trickling filter is converged into a sedimentation tank in the middle of the landscape filter bed, then is input into the bottom of the landscape filter bed through the sedimentation tank, and forms annular flow when passing through the landscape filter bed, so that the sewage is further subjected to deep purification treatment through a filler layer and a cultivation layer of the landscape filter bed, and finally the purified sewage flows out from the top of the landscape filter bed, and the purified water quality meets the national standard.
Application examples of the invention: china south agriculture university domestic sewage and reclaimed water treatment engineering
1. Engineering site conditions: the engineering entity is located at the southern agricultural university of the Tianheyuan of Guangzhou city, Guangdong province, the southern agricultural university of the south China is in the southern part of the Tianheyuan, more than 3200 people and more than 4.1 million people are produced in the school students all day long, and a large amount of domestic sewage generated every day causes huge economic burden to the school; meanwhile, the "bauhinia school" with beautiful environment needs to consume a large amount of landscape water every day, but the abundant lake water resource of the school cannot be effectively utilized.
2. The main economic indexes are as follows: the main item indexes of the item are shown in table a 1.
TABLE A1 Main economic indicators
Serial number Item Unit of Data of Remarks for note
1 Total investment of project Ten thousand yuan 10
2 Project processing scale m3/d 20
3 Floor area of sewage station Square meter 50
4 Pipe network length DN300 Rice and its production process 20
3. Water quality of inlet water: the quality of the influent water for this project is shown in Table A2.
TABLE A2 quality of influent water
Item Quality of inlet water Item Quality of inlet water
CODCr 208mg/L TN 60mg/L
SS 100mg/L TP 6mg/L
Ammonia nitrogen 49mg/L pH 6~9
4. The actual operation effect is as follows: the effluent quality after the sewage treatment of the project is CODCr、BOD5Ammonia nitrogen, total phosphorus and suspended matters are used as main investigation indexes, sampling monitoring is carried out irregularly by taking pollutant discharge standard GB18918-2002 of urban sewage treatment plant as reference standard, and figures 4-8 are water treatment operation effect during 3 months in 2018, wherein COD (chemical oxygen demand) isCr、BOD5The removal rates of ammonia nitrogen, total phosphorus and suspended matters are respectively stabilized at about 78%, 90%, 96%, 85%, 95% and 97%, and according to a comparison graph of raw water (untreated domestic sewage) and pilot effluent (treated domestic sewage), the following can be seen: the test point water treatment effect is stable, and the quality of each water outlet is obviously superior to the national first-class A discharge standard (namely the current strictest sewage discharge standard in China).
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (7)

1. The utility model provides a high load bio-trickling filter combines view filter bed system which characterized in that: the biological trickling filter is characterized by further comprising a pretreatment unit and a depth treatment unit, wherein the pretreatment unit is arranged at the bottom of the biological trickling filter and is connected with the top of the biological trickling filter through a water pump and a pipeline; the depth processing unit is also arranged at the bottom of the biological trickling filter, and the main body structure of the depth processing unit is annularly distributed at the periphery of the biological trickling filter;
the biological trickling filter comprises an aerobic section, an anoxic section and a dephosphorization section which are sequentially arranged from top to bottom, and a water distributor is arranged above the aerobic section; the main structure of the biological trickling filter is in a tower-shaped structure; the upper section of the tower-shaped structure is provided with independent multi-layer shale units, the top of the tower-shaped structure is open, and the side wall of the upper section of the tower-shaped structure is provided with vent holes so as to form an aerobic section; the middle section of the tower-shaped structure is provided with independent multilayer pumice units, and the middle section of the tower-shaped structure is closed, so that an anoxic section is formed; the lower section of the tower-shaped structure is internally provided with independent multi-layer broken brick units, the bottom of the tower-shaped structure is open, and the side wall of the lower section of the tower-shaped structure is provided with a vent hole so as to form a dephosphorization section;
the deep treatment unit is a landscape filter bed, the landscape filter bed comprises a sedimentation tank and an annular filter bed main body, the sedimentation tank is arranged on one side of the biological trickling filter, a water outlet at the bottom of the biological trickling filter faces the sedimentation tank, the annular filter bed main body is annularly distributed on the periphery of the biological trickling filter, and the sedimentation tank is connected with the annular filter bed main body through a water distribution channel;
the pretreatment unit comprises a grid well and an adjusting tank, the grid well is communicated with the adjusting tank, a filler reaction wall is arranged in the adjusting tank, and a filler of the filler reaction wall is pumice.
2. The high load bio-trickling filter combination landscape filter system of claim 1 further comprising: and a combined fiber packing layer is arranged among all units in the aerobic section, the anoxic section and the phosphorus removal section, and a combined fiber packing layer is also arranged among the anoxic section, the aerobic section and the phosphorus removal section.
3. The high load bio-trickling filter combination landscape filter system of claim 1 further comprising: a plurality of grid type bearing brackets are arranged in the aerobic section, the anoxic section and the dephosphorization section, the grid type bearing brackets of the aerobic section are filled with mud shale, the grid type bearing brackets of the anoxic section are filled with pumice, and the grid type bearing brackets of the dephosphorization section are filled with broken bricks.
4. The high load bio-trickling filter combination landscape filter system of claim 1 further comprising: the annular filter bed main body comprises a packing layer, a cultivated layer and a greening layer from bottom to top, wherein the packing layer is filled with crushed bricks and pumice, the cultivated layer is used for planting flower plants, and the flower plants form the greening layer.
5. The high load bio-trickling filter combination landscape filter system of claim 1 further comprising: the water distribution channel is connected with the lower part of the annular filter bed main body, and the water outlet of the annular filter bed main body is arranged at the upper part.
6. A high-load biological trickling filtration combined landscape filter bed process is characterized in that: the method comprises the following steps:
(1) inputting the sewage into a pretreatment unit for pretreatment, wherein the pretreatment comprises intercepting large-particle sewage garbage and improving the C/N ratio of the sewage;
(2) inputting the sewage treated in the step (1) into a biological trickling filter for microbial purification, wherein the microbial purification comprises nitrification in an aerobic section of the biological trickling filter to treat most organic matters and nitrogen ammonia substances in the sewage, denitrification in an anoxic section of the biological trickling filter to further treat nitrogen-containing substances, treatment of organic phosphorus and inorganic phosphorus in the sewage in a phosphorus removal section of the biological trickling filter, and then conveying the sewage to a landscape filter bed;
(3) and (3) inputting the sewage treated in the step (2) into a landscape filter bed for further advanced treatment.
7. The high load bio-trickling filter combined landscape filter bed process of claim 6, wherein: intercepting large-particle sewage garbage through a grating well in the step (1), and improving the C/N ratio of sewage through an adjusting tank internally provided with a filler reaction wall; in the step (3), the sewage is further deeply filtered and purified through the filler layer and the cultivation layer inside the landscape filter bed.
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