CN114349281A - Nitrogen and phosphorus removal treatment device for low-carbon-nitrogen-ratio polluted water and water treatment method - Google Patents
Nitrogen and phosphorus removal treatment device for low-carbon-nitrogen-ratio polluted water and water treatment method Download PDFInfo
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Abstract
The invention discloses a nitrogen and phosphorus removal treatment device for low-carbon-nitrogen-ratio polluted water and a water treatment method, and aims to solve the problem of poor nitrogen and phosphorus removal effect of rural low-carbon-nitrogen-ratio sewage. The invention relates to a nitrogen and phosphorus removal treatment device for polluted water with low carbon-nitrogen ratio, which comprises an ecological treatment chamber, an enhanced nitrogen and phosphorus removal chamber and an anaerobic reaction chamber, wherein aquatic plants are planted in the ecological treatment chamber, artificial aquatic plants are hung below each planting basket, a zeolite packing layer and a shell powder packing layer are arranged in the enhanced nitrogen and phosphorus removal chamber, three layers of partition nets are arranged at intervals along the height direction of the anaerobic reaction chamber, suspended biochar packing is filled between the partition nets, and a water distributor is arranged at the bottom of the anaerobic reaction chamber. The device and the method combine the ecological treatment chamber, the enhanced nitrogen removal chamber and the anaerobic reaction chamber, improve the carbon-nitrogen ratio of the water inlet of the anaerobic reaction chamber through step nitrogen removal, combine the slow-release carbon source, enhance the denitrification biochemical reaction and improve the nitrogen and phosphorus removal effect of the low-carbon-nitrogen-ratio polluted water.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a treatment device and a water treatment method for sewage with a low carbon-nitrogen ratio.
Background
With the development of industrial and agricultural production in China and the continuous improvement of the standard of living of people, a large amount of domestic sewage, industrial wastewater and non-point source water of agricultural production carry nitrogen-containing pollutants to be discharged into an environmental water body, so that the nitrogen content in the water body is increased, the water body is eutrophicated, and the safety problem of drinking water of residents is also caused. NH contained in the water supply network4 +N can enable nitrobacteria to grow and reproduce, the nitrobacteria generate odor in the metabolic process, and excessive nitric acid and nitrogen can reduce gastric nitrite nitrogen in the stomach, so that carcinogenic substances are formed.
In rural areas, chemical fertilizers are used in a large amount in farmlands, so that rural domestic sewage, agricultural production sewage, slope runoff and underground runoff water bodies contain high nitrogen and phosphorus pollutants to form sewage with low carbon-nitrogen ratio, and the traditional denitrification processes, such as an A/O process and an A process2The low content of organic carbon source in water body in the/O process and SBR process obviously reduces the efficiency of denitrification biochemical reaction, and the activity of denitrifying bacteria is low, so that the denitrification and dephosphorization effect of rural sewage with low carbon-nitrogen ratio is poor.
In order to improve the denitrification effect, an activated sludge process is adopted in the prior art, but a large amount of excess sludge is generated along with the continuous growth of microorganisms, secondary pollution is easily introduced in the anaerobic fermentation process, and the generated large amount of excess sludge can be discharged into the environment after being reprocessed.
Disclosure of Invention
The invention aims to solve the problem of poor denitrification and dephosphorization effects of rural sewage with a low carbon-nitrogen ratio, and provides a denitrification and dephosphorization treatment device and a water treatment method for polluted water with a low carbon-nitrogen ratio.
The invention relates to a nitrogen and phosphorus removal treatment device for polluted water with low carbon-nitrogen ratio, which comprises an ecological treatment chamber, an enhanced nitrogen and phosphorus removal chamber and an anaerobic reaction chamber, wherein a floating plate floats on the water surface of the ecological treatment chamber, a plurality of planting baskets are arranged on the lower surface of the floating plate, aquatic plants are planted in the planting baskets, artificial aquatic plants are hung below each planting basket, an oxygen aeration device is arranged at the bottom of the ecological treatment chamber, a water inlet is formed in the wall of one side chamber of the ecological treatment chamber, a drain pipe is formed in the upper part of the ecological treatment chamber, the enhanced nitrogen and phosphorus removal chamber is positioned below the drain pipe, and a zeolite filler layer and a shell powder filler layer are arranged along the lower edge of the water surface of the enhanced nitrogen and phosphorus removal chamber;
the anaerobic reaction chamber comprises an upper cover, partition nets, suspended biochar fillers and a water distributor, wherein the upper cover is arranged on the top of the anaerobic reaction chamber in a covering mode to enable an anaerobic environment to be formed in the anaerobic reaction chamber, three partition nets are arranged at intervals in the height direction of the anaerobic reaction chamber, the suspended biochar fillers are filled between the upper partition net and the middle partition net, the suspended biochar fillers are also filled between the lower partition net and the middle partition net, the filling rate of the upper suspended biochar fillers is higher than that of the lower suspended biochar fillers, the water distributor is arranged at the bottom of the anaerobic reaction chamber, one end of a connecting pipe is communicated with a water outlet of the enhanced denitrification chamber, the other end of the connecting pipe is connected with the water distributor, and the upper portion of the anaerobic reaction chamber is provided with a water outlet.
The nitrogen and phosphorus removal treatment method of the polluted water with the low carbon-nitrogen ratio is realized according to the following steps:
firstly, enabling low-carbon-nitrogen-ratio polluted water to flow into an ecological treatment chamber from a water inlet, aerating a water body by using an oxygen aeration device, increasing the dissolved oxygen of the polluted water, and controlling the hydraulic retention time in the ecological treatment chamber to be 8-16 h to obtain pretreated sewage;
secondly, enabling the pretreated sewage to flow into an enhanced denitrification chamber through a drain pipe, performing enhanced denitrification treatment through a zeolite filler layer and a shell powder filler layer, and controlling the hydraulic retention time of the enhanced denitrification chamber to be 2-6 h to obtain water after denitrification treatment;
thirdly, the water after denitrification flows into the anaerobic reaction chamber through the connecting pipe, rises through the water distributor and flows through the suspended biochar filler area, the hydraulic retention time in the anaerobic reaction chamber is controlled to be 10-20 h, and the purified water is discharged from the water outlet, so that the denitrification and dephosphorization treatment of the low-carbon-nitrogen-ratio polluted water is completed.
The invention relates to a nitrogen and phosphorus removal treatment device and a water treatment method for polluted water with a low carbon-nitrogen ratio, and mainly aims at the influence of denitrification biochemical reaction on rural sewage with a low carbon-nitrogen ratio, such as farmland slope runoff, domestic sewage or sewage subjected to precipitation treatment, wherein the content of nitrogen (organic nitrogen, ammonia nitrogen and nitrate) and phosphorus in a water body is high, the carbon source is insufficient, and the carbon-nitrogen ratio is low (0.8-4.5).
The nitrogen and phosphorus removal treatment device for the carbon-nitrogen ratio polluted water combines the ecological treatment chamber, the enhanced nitrogen removal chamber and the anaerobic reaction chamber, aquatic plants and artificial aquatic weeds are arranged in the ecological treatment chamber, and the aquatic plants can utilize nitrogen and phosphorus nutrient elements in a water body, so that the aquatic plants grow well and provide a certain organic carbon source. The aquatic plant can absorb and intercept nitrogen and phosphorus elements, the plant root microorganisms can mineralize organic phosphorus, the phosphorus accumulating bacteria in the biomembrane on the surface of the artificial aquatic plant can also absorb phosphorus in the water body, and NH in the water body is removed through the nitrification of the microorganisms in the biomembrane3N, the ecological treatment chamber consumes less carbon source as a whole, sewage pretreated by the ecological treatment chamber flows into the enhanced denitrification chamber, the enhanced denitrification chamber is internally provided with a zeolite packing layer and a shell powder packing layer, the zeolite and the shell powder have strong selective adsorbability on ammonia nitrogen ions in water, ammonia nitrogen and total nitrogen in the water are removed effectively, the alkalinity of the water is increased, the zeolite and the shell powder flow back to the ecological treatment chamber through a return pipe, the nitration reaction in the ecological treatment chamber is promoted, and the carbon content is improvedAnd the water after denitrification treatment flows into the anaerobic reaction chamber, suspended biochar filler is used as a carrier and a slow-release carbon source, the carbon-nitrogen ratio is further improved, and denitrification reaction is performed through an anaerobic biomembrane on the suspended biochar filler to perform denitrification.
The invention relates to a nitrogen and phosphorus removal treatment device and a water treatment method for low-carbon-nitrogen-ratio polluted water, wherein an ecological treatment chamber, an enhanced nitrogen removal chamber and an anaerobic reaction chamber are combined, the carbon-nitrogen ratio of inlet water of the anaerobic reaction chamber is improved through stepped nitrogen removal, a slow-release carbon source is combined, the denitrification biochemical reaction is enhanced, the nitrogen and phosphorus removal effect of the low-carbon-nitrogen-ratio polluted water is improved, the COD removal rate of sewage is about 85-90%, the TP removal rate reaches about 95%, and NH is added4 +The removal rate of-N reaches more than 90 percent.
Drawings
FIG. 1 is a schematic structural diagram of a denitrification and dephosphorization treatment device for sewage with low carbon-nitrogen ratio.
Detailed Description
The first embodiment is as follows: the nitrogen and phosphorus removal treatment device for the polluted water with the low carbon-nitrogen ratio comprises an ecological treatment chamber 1, an enhanced nitrogen and phosphorus removal chamber 2 and an anaerobic reaction chamber 3, wherein a floating plate 5 floats on the water surface of the ecological treatment chamber 1, a plurality of planting baskets 6 are arranged on the lower surface of the floating plate 5, aquatic plants 7 are planted in the planting baskets 6, artificial aquatic plants 8 are hung below each planting basket 6, an oxygen exposure device 9 is arranged at the bottom of the ecological treatment chamber 1, a water inlet 4 is formed in the wall of one side chamber of the ecological treatment chamber 1, a drain pipe 11 is formed in the upper part of the ecological treatment chamber 1, the enhanced nitrogen removal chamber 2 is positioned below the drain pipe 11, and a zeolite filler layer 2-1 and a shell powder filler layer 2-2 are arranged along the water surface of the enhanced nitrogen removal chamber 2;
the anaerobic reaction chamber 3 comprises an upper cover 16, a separation net 15, suspended biochar fillers 14 and a water distributor 13, the upper cover 16 is arranged on the top of the anaerobic reaction chamber 3 in a covering mode to enable an anaerobic environment to be formed in the anaerobic reaction chamber 3, three layers of separation nets 15 are arranged at intervals in the height direction of the anaerobic reaction chamber 3, the suspended biochar fillers 14 are filled between the upper layer separation net and the middle layer separation net, the suspended biochar fillers 14 are also filled between the lower layer separation net and the middle layer separation net, the filling rate of the upper suspended biochar fillers 14 is higher than that of the lower suspended biochar fillers 14, the water distributor 13 is arranged at the bottom of the anaerobic reaction chamber 3, one end of a connecting pipe 12 is communicated with a water outlet of the enhanced denitrification chamber 2, the other end of the connecting pipe 12 is connected with the water distributor 13, and the upper portion of the anaerobic reaction chamber 3 is provided with a water outlet 18.
The oxygen aeration device 9 of the present embodiment is connected to an air pump 10.
The second embodiment is as follows: the difference between the present embodiment and the first embodiment is that the planting baskets 6 on the floating plate 5 are arranged in a rectangular array.
The third concrete implementation mode: the difference between the present embodiment and the present embodiment is that the aquatic plant 7 is one or more mixed plants of reed, calamus, cattail, canna and reed.
The fourth concrete implementation mode: the present embodiment is different from one of the first to third embodiments in that a water pump 17 is provided on the connection pipe 12.
The fifth concrete implementation mode: the difference between the present embodiment and one of the first to the fourth embodiments is that one end of the return pipe 19 is communicated with the bottom of the enhanced denitrification chamber 2, and the other end of the return pipe 19 is communicated with the water inlet 4 of the ecological treatment chamber 1.
The sixth specific implementation mode: the difference between the present embodiment and one of the first to fifth embodiments is that the filling rate of the upper suspended biological carbon filler 14 in the anaerobic reaction chamber 3 is 70% -85%, and the filling rate of the lower suspended biological carbon filler 14 is 30% -45%.
The seventh embodiment: the difference between the embodiment and one of the first to sixth embodiments is that the preparation of the suspended biological carbon filler is implemented according to the following steps:
firstly, putting plant straws in a tubular furnace, and carrying out pyrolysis treatment at 800 ℃ for 2-3h in a nitrogen atmosphere to obtain straw biochar;
secondly, soaking the straw biochar in a glucose or starch solution to obtain composite carbon source biochar;
thirdly, heating and dissolving the polyvinyl alcohol and the sodium alginate in water to obtain a cross-linking agent solution, and then adding the diatomite to obtain a cross-linking agent containing the diatomite;
fourthly, adding the composite carbon source biochar into a cross-linking agent containing diatomite, extruding to form a composite material, and then adding CaCl2And carrying out crosslinking reaction in a saturated boric acid solution, and drying to obtain the suspended biochar filler.
The specific implementation mode is eight: the nitrogen and phosphorus removal treatment method for the polluted water with the low carbon-nitrogen ratio is realized according to the following steps:
firstly, the polluted water with low carbon-nitrogen ratio flows into the ecological treatment chamber 1 from the water inlet 4, the water body is aerated by utilizing the aeration device 9, the dissolved oxygen amount of the polluted water is increased, and the hydraulic retention time in the ecological treatment chamber 1 is controlled to be 8-16 h, so that pretreated sewage is obtained;
secondly, the pretreated sewage flows into an enhanced denitrification chamber 2 through a drain pipe 11, enhanced denitrification treatment is carried out through a zeolite filler layer 2-1 and a shell powder filler layer 2-2, and the hydraulic retention time of the enhanced denitrification chamber 2 is controlled to be 2-6 h, so that water after denitrification treatment is obtained;
thirdly, the water after denitrification flows into the anaerobic reaction chamber 3 through the connecting pipe 12, rises through the suspended biochar filler region through the water distributor 13, the hydraulic retention time in the anaerobic reaction chamber 3 is controlled to be 10-20 h, and the purified water is discharged from the water outlet 18, so that the denitrification and dephosphorization treatment of the polluted water with low carbon-nitrogen ratio is completed.
The specific implementation method nine: the difference between the present embodiment and the eighth embodiment is that the concentration of dissolved oxygen in the ecological treatment chamber 1 is controlled to be 4.3-5 mg/L in the first step.
The detailed implementation mode is ten: the difference between the present embodiment and the eighth embodiment is that the hydraulic retention time in the ecological treatment chamber 1 in the first step is controlled to be 10-12 h.
The concrete implementation mode eleven: the difference between the embodiment and the eighth embodiment is that the hydraulic retention time in the anaerobic reaction chamber 3 is controlled to be 14-18 h in the third step.
The first embodiment is as follows: the nitrogen and phosphorus removal treatment device for the low-carbon-nitrogen-ratio polluted water comprises an ecological treatment chamber 1, an enhanced nitrogen and phosphorus removal chamber 2 and an anaerobic reaction chamber 3, wherein a floating plate 5 floats on the water surface of the ecological treatment chamber 1, a plurality of planting baskets 6 are arranged on the lower surface of the floating plate 5, aquatic plants 7 are planted in the planting baskets 6, the aquatic plants 7 are mixed planting of calamus, canna and reed, an artificial float grass 8 is hung below each planting basket 6, a plurality of oxygen exposure devices 9 are arranged at the bottom of the ecological treatment chamber 1, a water inlet 4 is formed in one side chamber wall of the ecological treatment chamber 1, a drain pipe 11 is formed in the upper part of the ecological treatment chamber 1, the enhanced nitrogen and phosphorus removal chamber 2 is positioned below the drain pipe 11, and a zeolite filler layer 2-1 and a shell powder filler layer 2-2 are sequentially arranged below the water surface of the enhanced nitrogen and along the height direction;
the anaerobic reaction chamber 3 comprises an upper cover 16, a separation net 15, suspended biochar filler 14 and a water distributor 13, the upper cover 16 is covered on the top of the anaerobic reaction chamber 3 to form an anaerobic environment in the anaerobic reaction chamber 3, three layers of separation nets 15 are arranged at intervals along the height direction of the anaerobic reaction chamber 3, the suspended biochar filler 14 is filled between the upper layer of separation net and the middle layer of separation net, and the filling rate of the upper suspended biochar filler 14 is 85%; suspended biological carbon fillers 14 are also filled between the lower layer separation net and the middle layer separation net, the filling rate of the lower suspended biological carbon fillers 14 is 40%, the water distributor 13 is arranged at the bottom of the anaerobic reaction chamber 3, one end of the connecting pipe 12 is communicated with the water outlet of the enhanced denitrification chamber 2, the other end of the connecting pipe 12 is connected with the water distributor 13, and the upper part of the anaerobic reaction chamber 3 is provided with a water outlet 18; one end of the return pipe 19 is communicated with the bottom of the enhanced denitrification chamber 2, and the other end of the return pipe 19 is communicated with the water inlet 4 of the ecological treatment chamber 1.
The calamus, canna and reed of this example grew well and had dense roots.
In the embodiment, the shell powder filler layer in the enhanced denitrification chamber ensures that the water entering the anaerobic reaction chamber is alkalescent, and the anaerobic denitrification is ensured to be under the optimal pH condition.
In the embodiment, biological films are hung on the artificial aquatic weed 8 and the suspended biological carbon filler 14 respectively.
The filling rate of the suspended biological carbon filler at the middle upper part of the anaerobic reaction chamber is high, and the anaerobic reaction chamber is equivalent to a fixed bed; the filling rate of the suspended biological carbon filler at the lower part is low, which is equivalent to a moving bed, the suspended biological carbon filler at the lower part is impacted by water flow of a water distributor, the thickness of a biological film on the surface of the suspended biological carbon filler is thinner, but the biological activity is higher.
The preparation of the suspended biochar filler in this example is carried out according to the following steps:
firstly, putting plant straws (corn straws or wheat straws) into a tubular furnace, carrying out pyrolysis treatment for 2 hours at the temperature of 800 ℃ in a nitrogen atmosphere, and controlling the flow of nitrogen to be 1L/min to obtain straw biochar;
secondly, soaking the straw biochar in a glucose or starch solution to obtain composite carbon source biochar;
thirdly, heating and dissolving the polyvinyl alcohol and the sodium alginate in water to obtain a cross-linking agent solution, and then adding the diatomite to obtain a cross-linking agent containing the diatomite;
fourthly, adding the composite carbon source biochar into a cross-linking agent containing diatomite, extruding to form a composite material (block), and putting the composite material into CaCl2And (3) carrying out crosslinking reaction for 30h in a saturated boric acid solution, and drying to obtain the suspended biochar filler.
The mass ratio of the polyvinyl alcohol to the sodium alginate in the example is (5-6): 1, 0.5g of diatomaceous earth is added per ml of crosslinker solution.
The suspended biochar filler prepared by the embodiment has stable carbon release effect, and the average TOC release amount within 15 days is 20-35 mg/g.
The first application embodiment: the embodiment of the invention adopts the treatment device of the first embodiment to carry out nitrogen and phosphorus removal treatment on the low carbon-nitrogen ratio polluted water according to the following steps:
firstly, polluted water with low carbon-nitrogen ratio flows into an ecological treatment chamber 1 from a water inlet 4, an oxygen aeration device 9 is utilized to aerate a water body, the concentration of dissolved oxygen in the ecological treatment chamber 1 is controlled to be 4.6mg/L, the dissolved oxygen of the polluted water is increased, the hydraulic retention time in the ecological treatment chamber 1 is controlled to be 12 hours, and pretreated sewage is obtained;
secondly, the pretreated sewage flows into an enhanced denitrification chamber 2 through a drain pipe 11, enhanced denitrification treatment is carried out through a zeolite filler layer 2-1 and a shell powder filler layer 2-2, and the hydraulic retention time of the enhanced denitrification chamber 2 is controlled to be 3 hours, so that water after denitrification treatment is obtained;
thirdly, the water (pH 7.8) after the denitrification treatment flows into the anaerobic reaction chamber 3 through the connecting pipe 12, rises through the suspended biochar filler region through the water distributor 13, controls the hydraulic retention time in the anaerobic reaction chamber 3 to be 18h, and discharges the purified water from the water outlet 18 to finish the denitrification and dephosphorization treatment of the polluted water with low carbon-nitrogen ratio.
In the embodiment, the carbon source is slowly released through the suspended biochar filler in the anaerobic reaction chamber 3, so that the carbon-nitrogen ratio of the sewage in the anaerobic reaction chamber is 6-7.
In this example, the raw water is farmland slope runoff and the raw water CODCr255mg/L, TN 153mg/L, NH4 +N is 128mg/L, TP is 18mg/L, SS is 132 mg/L; COD of denitrified waterCr158mg/L and TN 48 mg/L; purified water CODCr38mg/L, TN 11.8mg/L, NH4 +N8.1 mg/L, TP 0.8mg/L, and SS 12 mg/L.
Application example two: the embodiment of the invention adopts the treatment device of the first embodiment to carry out nitrogen and phosphorus removal treatment on the low carbon-nitrogen ratio polluted water according to the following steps:
firstly, polluted water with low carbon-nitrogen ratio flows into an ecological treatment chamber 1 from a water inlet 4, an oxygen aeration device 9 is utilized to aerate a water body, the concentration of dissolved oxygen in the ecological treatment chamber 1 is controlled to be 4.6mg/L, the dissolved oxygen of the polluted water is increased, the hydraulic retention time in the ecological treatment chamber 1 is controlled to be 9 hours, and pretreated sewage is obtained;
secondly, the pretreated sewage flows into an enhanced denitrification chamber 2 through a drain pipe 11, enhanced denitrification treatment is carried out through a zeolite filler layer 2-1 and a shell powder filler layer 2-2, and the hydraulic retention time of the enhanced denitrification chamber 2 is controlled to be 3 hours, so that water after denitrification treatment is obtained;
thirdly, the water (pH 7.6) after the denitrification treatment flows into the anaerobic reaction chamber 3 through the connecting pipe 12, rises through the suspended biochar filler region through the water distributor 13, controls the hydraulic retention time in the anaerobic reaction chamber 3 to be 14h, and discharges the purified water from the water outlet 18 to finish the denitrification and dephosphorization treatment of the polluted water with low carbon-nitrogen ratio.
In this example, the raw water is farmland slope runoff and the raw water CODCr283mg/L, TN 118mg/L, NH4 +N is 97mg/L, TP is 12mg/L, and SS is 152 mg/L; purified water CODCr30.5mg/L, TN 13.5mg/L, NH4 +11.4mg/L of-N, 0.7mg/L of TP and 16.5mg/L of SS.
Claims (10)
1. A nitrogen and phosphorus removal treatment device for low carbon-nitrogen ratio polluted water is characterized by comprising an ecological treatment chamber (1), an enhanced nitrogen and phosphorus removal chamber (2) and an anaerobic reaction chamber (3), a floating plate (5) floats on the water surface of the ecological treatment chamber (1), a plurality of planting baskets (6) are arranged on the lower surface of the floating plate (5), aquatic plants (7) are planted in the planting baskets (6), artificial aquatic plants (8) are hung below each planting basket (6), an oxygen aeration device (9) is arranged at the bottom of the ecological treatment chamber (1), a water inlet (4) is arranged on the wall of one side of the ecological treatment chamber (1), a drain pipe (11) is arranged at the upper part of the ecological treatment chamber (1), the enhanced denitrification chamber (2) is positioned below the drain pipe (11), a zeolite filler layer (2-1) and a shell powder filler layer (2-2) are arranged along the lower part of the water surface of the enhanced denitrification chamber (2);
the anaerobic reaction chamber (3) comprises an upper cover (16), a separation net (15), suspended biochar fillers (14) and a water distributor (13), the upper cover (16) is arranged on the top of the anaerobic reaction chamber (3) to enable an anaerobic environment to be formed in the anaerobic reaction chamber (3), three layers of separation nets (15) are arranged at intervals along the height direction of the anaerobic reaction chamber (3), the suspended biochar fillers (14) are filled between the upper layer separation net and the middle layer separation net, the suspended biochar fillers (14) are also filled between the lower layer separation net and the middle layer separation net, the filling rate of the suspended biochar fillers (14) on the upper part is higher than that of the suspended biochar fillers (14) on the lower part, the water distributor (13) is arranged at the bottom of the anaerobic reaction chamber (3), one end of a connecting pipe (12) is communicated with a water outlet of the denitrification enhanced chamber (2), and the other end of the connecting pipe (12) is connected with the water distributor (13), the upper part of the anaerobic reaction chamber (3) is provided with a water outlet (18).
2. The apparatus for removing nitrogen and phosphorus from polluted water with low carbon-nitrogen ratio as claimed in claim 1, wherein the aquatic plant (7) is one or more of reed, calamus, cattail, canna, and reed.
3. The apparatus for removing nitrogen and phosphorus from contaminated water with low carbon-nitrogen ratio as claimed in claim 1, wherein a water pump (17) is provided on the connecting pipe (12).
4. The device for removing nitrogen and phosphorus from polluted water with low carbon-nitrogen ratio as claimed in claim 1, wherein one end of the return pipe (19) is connected to the bottom of the enhanced nitrogen removal chamber (2), and the other end of the return pipe (19) is connected to the water inlet (4) of the ecological treatment chamber (1).
5. The device for removing nitrogen and phosphorus from polluted water with low carbon-nitrogen ratio as claimed in claim 1, wherein the filling rate of the suspended biochar filler (14) at the upper part in the anaerobic reaction chamber (3) is 70% -85%, and the filling rate of the suspended biochar filler (14) at the lower part is 30% -45%.
6. The device for removing nitrogen and phosphorus from polluted water with low carbon-nitrogen ratio as claimed in claim 1, wherein the preparation of the suspended biochar filler is implemented according to the following steps:
firstly, putting plant straws in a tubular furnace, and carrying out pyrolysis treatment at 800 ℃ for 2-3h in a nitrogen atmosphere to obtain straw biochar;
secondly, soaking the straw biochar in a glucose or starch solution to obtain composite carbon source biochar;
thirdly, heating and dissolving the polyvinyl alcohol and the sodium alginate in water to obtain a cross-linking agent solution, and then adding the diatomite to obtain a cross-linking agent containing the diatomite;
fourthly, adding the composite carbon source biochar into a cross-linking agent containing diatomite, extruding to form a composite material, and then adding CaCl2And carrying out crosslinking reaction in a saturated boric acid solution, and drying to obtain the suspended biochar filler.
7. The nitrogen and phosphorus removal treatment method of the polluted water with low carbon-nitrogen ratio is characterized by comprising the following steps:
firstly, enabling the polluted water with low carbon-nitrogen ratio to flow into an ecological treatment chamber (1) from a water inlet (4), aerating a water body by using an oxygen aeration device (9), increasing the dissolved oxygen of the polluted water, and controlling the hydraulic retention time in the ecological treatment chamber (1) to be 8-16 h to obtain pretreated sewage;
secondly, the pretreated sewage flows into an enhanced denitrification chamber (2) through a drain pipe (11), enhanced denitrification treatment is carried out through a zeolite filler layer (2-1) and a shell powder filler layer (2-2), and the hydraulic retention time of the enhanced denitrification chamber (2) is controlled to be 2-6 h, so that water after denitrification treatment is obtained;
thirdly, the water after denitrification flows into the anaerobic reaction chamber (3) through the connecting pipe (12), rises through the water distributor (13) and flows through the suspended biochar filler area, the hydraulic retention time in the anaerobic reaction chamber (3) is controlled to be 10-20 h, and the purified water is discharged from the water outlet (18), so that the denitrification and dephosphorization treatment of the low-carbon-nitrogen-ratio polluted water is completed.
8. The method of claim 7, wherein the concentration of dissolved oxygen in the ecological treatment chamber (1) is controlled to be 4.3-5 mg/L.
9. The method for removing nitrogen and phosphorus from polluted water with low carbon-nitrogen ratio as claimed in claim 7, wherein the hydraulic retention time in the ecological treatment chamber (1) is controlled to be 10-12 h in the first step.
10. The method for removing nitrogen and phosphorus from polluted water with low carbon-nitrogen ratio as claimed in claim 7, wherein the hydraulic retention time in the anaerobic reaction chamber (3) is controlled to be 14-18 h in the third step.
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| CN104445833A (en) * | 2014-12-23 | 2015-03-25 | 江苏艾特克环境工程设计研究院有限公司 | Biochemical denitrifying method for wastewater |
| CN106542635A (en) * | 2016-11-01 | 2017-03-29 | 北京大学 | A kind of artificial wet land system of strengthened denitrification |
| CN111170445A (en) * | 2020-02-25 | 2020-05-19 | 桂林理工大学 | Artificial floating bed system and method for purifying water quality by using superfine fibers |
Cited By (1)
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| CN115557643A (en) * | 2022-10-18 | 2023-01-03 | 威海智洁环保技术有限公司 | Urban domestic sewage treatment system and resource utilization method |
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