CN211141648U - Composite sewage treatment device of tidal flow artificial wetland coupled biological contact reaction tank - Google Patents
Composite sewage treatment device of tidal flow artificial wetland coupled biological contact reaction tank Download PDFInfo
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- CN211141648U CN211141648U CN201922085913.9U CN201922085913U CN211141648U CN 211141648 U CN211141648 U CN 211141648U CN 201922085913 U CN201922085913 U CN 201922085913U CN 211141648 U CN211141648 U CN 211141648U
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Abstract
The utility model relates to a compound sewage treatment plant in tidal flow constructed wetland coupling biological contact reaction pond belongs to the sewage treatment field. The device comprises a tidal flow wetland unit I, a tidal flow wetland unit II, a sedimentation tank and a biological contact reaction tank, wherein the tidal flow wetland unit I and the tidal flow wetland unit II are arranged in parallel, a water outlet pipe I and a water outlet pipe II of the sedimentation tank are respectively communicated with the tidal flow wetland unit I and a water inlet pipe of the tidal flow wetland unit II, the tidal flow wetland unit I and the water outlet pipe of the tidal flow wetland unit II are respectively communicated with the biological contact reaction tank, a water outlet pipe is arranged at the center of a tank body of the biological contact reaction tank, the water outlet pipe of the biological contact reaction tank is respectively communicated with the tidal flow wetland unit I and the water inlet pipe of the tidal flow wetland unit II, and a sludge hopper is arranged at the bottom of the. The device can efficiently remove pollutants in sewage, has strong impact load resistance, can effectively delay the blockage of wetland substrates, improves the wetland treatment capacity and prolongs the service life.
Description
Technical Field
The utility model relates to a compound sewage treatment plant in tidal flow constructed wetland coupling biological contact reaction pond belongs to the sewage treatment field.
Background
With the rapid development of society and economy, the discharge amount of various sewage is increased year by year. However, the construction of sewage treatment facilities in areas with underdeveloped economy or low population density is not perfect, and the phenomenon that a large amount of domestic sewage and the like are directly discharged into rivers or lakes exists, so that the water bodies of the received rivers and lakes are polluted, the functions of the water bodies are reduced, and the ecological safety of a basin is threatened. Therefore, it is urgently needed to improve the coverage rate of domestic sewage treatment in rural areas and improve the overall level of rural environment through the construction of sewage collection pipe networks and the construction of centralized and decentralized sewage treatment facilities.
The artificial wetland technology is a distributed sewage ecological treatment technology, pollutants are removed through wetland substrate interception, adsorption, microbial transformation and decomposition and wetland plant absorption and utilization, the artificial wetland technology has the advantages of low construction and operation cost, convenience in management, good effluent quality, high ecological environment added value and the like, and is widely applied to treatment of domestic sewage in rural areas and the like.
However, the denitrification efficiency of the traditional artificial wetland process is often limited by insufficient content of dissolved oxygen and organic carbon source in water, and the problems of poor long-term pollutant removal effect, wetland blockage and the like are often caused by overhigh pollution load. The tidal flow artificial wetland simulates the natural tidal process, the oxygen content of the wetland is improved through the operation mode of water inlet, reaction and emptying reoxygenation, the nitrification effect is enhanced, and alternate aerobic-anoxic/anaerobic environment conditions are created, so that the method is an operation method for effectively enhancing the denitrification efficiency of the wetland. However, the problems of large floor area, low pollutant removal load, poor pollutant removal effect under high load, easy blockage of substrate and the like still exist in a single tidal flow artificial wetland system, and how to construct a low-cost, high-efficiency and highly sustainable sewage treatment system suitable for rural areas and the like on the basis of the artificial wetland is still one of the difficulties in the related fields. Besides, the wetland is one of the important sources for discharging greenhouse gases, and how to reduce the greenhouse gas discharge of the wetland is also an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The above-mentioned technical problem who exists is used to current constructed wetland sewage treatment technique, provides a composite set who is applicable to the biological contact reaction pond of tidal current constructed wetland coupling of handling all kinds of dispersion type sewage, the utility model discloses carry out organic combination with sedimentation tank, "saturation-evacuation" two-stage tidal current constructed wetland and biological contact reaction pond that operating condition is opposite, remove various pollutants in the sewage through this multithread processing apparatus under the operation scheme of optimal design, shorten sewage treatment required time, promote the sewage treatment effect, can satisfy the requirement that sewage nitrogen and phosphorus removal and organic matter to different C/N ratio got rid of. The biochar particles are used as wetland matrix filler, and greenhouse gas emission reduction is facilitated.
The utility model discloses a tidal flow wetland-biological contact reaction tank composite device for treating the dispersive sewage of different CNs. The tidal flow wetland can provide better conditions for activities of microorganisms for nitrification and organic matter decomposition due to stronger reoxygenation capability, the biological contact reaction tank can keep the anaerobic or facultative state of a certain water body for a long time, a suitable place for denitrifying microorganisms to decompose products of nitrification reaction is provided, and various pollutants are further removed. The wetland is intake and is sedimentated through the sedimentation tank first, can effectively get rid of aquatic particulate matter, and two sets of wetland systems are as the first treatment level in turn simultaneously, effectively delay the wetland bed body and block up, prolong wetland life.
The utility model discloses a solve its technical problem and the technical scheme who adopts is:
a composite sewage treatment device of a tidal flow artificial wetland coupling biological contact reaction tank comprises a tidal flow wetland unit I1, a tidal flow wetland unit II 13, a sedimentation tank 4 and a biological contact reaction tank 7, wherein the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are arranged in parallel, a water outlet pipe I and a water outlet pipe II of the sedimentation tank 4 are respectively communicated with water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13, the water outlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are respectively communicated with the biological contact reaction tank 7, a water outlet pipe is arranged in the center of a tank body of the biological contact reaction tank 7, the water outlet pipe of the biological contact reaction tank 7 is respectively communicated with the water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13, and the bottom of the biological contact reaction tank 7 is provided with a sludge hopper.
And the bottom of the biological contact reaction tank 7 is provided with a water distributor 8, and water outlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are communicated with the water distributor 8.
Preferably, the water distributor 8 is a pulse water distributor, and flushes the existing biological membrane when pulse water enters, so as to be beneficial to promoting the growth of a new biological membrane;
further, the bottom end of the sludge hopper 9 is externally connected with a sludge pump.
The water outlet pipe of the biological contact reaction tank 7 is provided with a timing switch 5 and a water pump 12, and the water outlet pipe of the biological contact reaction tank 7 is respectively communicated with the water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 through the water inlet pipe I and the water inlet pipe II.
Furthermore, an electronic gate 3 is arranged on the water outlet pipe I of the sedimentation tank 4, the water outlet pipe II of the sedimentation tank 4, the water outlet pipe of the tidal flow wetland unit I1, the water outlet pipe of the tidal flow wetland unit II 13, the water inlet pipe I and the water inlet pipe II.
A plurality of rows of biological film fillers 10 are suspended in the biological contact reaction tank 7;
furthermore, the top end and the bottom end of the biological contact reaction tank 7 are both provided with cross bars 6, the biological membrane packing 10 is suspended between the cross bars 6, and the suspension density is 9-12 strings/square meter.
Further, in order to treat low C/N sewage, a slow-release carbon source bag 11 is suspended in the biological contact reaction tank 7 to provide a carbon source required by denitrification for the low C/N ratio sewage, and the slow-release carbon source can be a biomass carbon source such as reed straws and the like.
Furthermore, a detachable opaque cover plate is arranged at the top of the biological contact reaction tank 7, small holes are formed in the opaque cover plate to facilitate gas dissipation generated by sewage treatment, and the reaction tank is in a flooded state for a long time, so that processes such as denitrification and the like are facilitated;
the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are identical in structure and comprise matrixes and wetland plants 2, the wetland plants 2 are planted on the tops of the matrixes, gravel bottom layers are filled at the bottoms of the matrixes, gravel top layers are filled at the tops of the matrixes, and biochar particles are filled between the gravel bottom layers and the gravel top layers.
Further, the gravel particle size of the gravel top layer is smaller than that of the gravel bottom layer;
furthermore, the bed packing of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 comprises small-particle-size gravel (5-10mm), large-particle-size gravel (10-30mm) and biochar particles (3-10mm), and the small-particle-size gravel is filled on the surface layer of the bed and occupies 1/3 of the whole bed volume; the biochar particles are filled in the middle of the bed body and occupy 1/3 of the whole bed body; large-particle-size gravel is filled in the lower layer of the bed body and occupies 1/3 of the whole volume of the bed body;
the inner walls of the sedimentation tank 4, the tidal flow wetland unit I1, the tidal flow wetland unit II 13 and the biological contact reaction tank 7 are all provided with impermeable layers, and the outer walls of the sedimentation tank, the tidal flow wetland unit I1 and the tidal flow wetland unit II are provided with water stop steel plate layers; the tank body is cast by using impermeable concrete, and sewage can be prevented from seeping polluted soil and underground water after waterproof treatment.
The sewage enters a sedimentation tank in the composite device for pretreatment, then flows into the tidal flow wetland unit I1, stays for 3-6 hours for treatment, and then enters a biological contact reaction tank 7; emptying the tidal flow wetland unit I1 for 3-6 hours; before sewage of the tidal flow wetland unit I1 enters a biological contact reaction tank, pumping half volume of the treated sewage in the tank into another tidal flow artificial wetland unit II 13 in an idle period by a water pump for treatment for 3-6 hours, finally discharging the sewage, and emptying the tidal flow wetland unit II 13 for idle for 3-6 hours; when the tidal flow wetland unit II 13 drains water, the idle period of the tidal flow wetland unit I1 is ended, and water is introduced into the sedimentation tank again; the sewage treatment and emptying time of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are equal, but are in opposite sewage saturation treatment-emptying states, namely when the tidal flow wetland unit I1 is in a sewage saturation treatment state, the tidal flow wetland unit II 13 is in a sewage emptying state, and when the tidal flow wetland unit I1 is in a sewage emptying state, the tidal flow wetland unit II 13 is in a sewage saturation treatment state;
the length of the treatment and emptying idle time of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 is determined according to the concentration of pollutants in sewage, and the higher the sewage concentration is, the longer the emptying idle time is;
the sewage flows into the tidal flow wetland unit from the sedimentation tank and flows into the biological contact reaction tank from the tidal flow wetland unit through the electronic valve, and the sewage is controlled by gravity flow; sewage flows into another tidal flow wetland unit from the biological contact reaction tank and is lifted by a water pump; the time length of the water pump which is started each time is controlled to be 5-10 minutes.
And after the system operates for 1-2 months, the water outlet end of the sedimentation tank is changed into a tidal flow wetland unit II 13 from the tidal flow wetland unit I1, sewage is treated in the tidal flow wetland unit II 13 and then discharged into the biological contact reaction tank 7, and then enters the tidal flow wetland unit I1 for treatment and then discharged, and the circulation is carried out according to the treatment.
The utility model has the advantages that:
(1) the composite device of the utility model is connected in series to use three structures with different functions, and can achieve efficient sewage treatment effect in a short hydraulic retention time; the sedimentation tank is mainly used for removing suspended matters in water and also can be used for removing organic matters to a certain extent and is used as a hydrolysis acidification tank. After the tidal flow wetland units are emptied, the substrate is subjected to reoxygenation, and NH is generated by microorganisms through nitrification4 +It is converted to NO3 -The next cycle of water inflow can generate denitrification to remove NO3 -(ii) a Meanwhile, organic matters including extracellular secretion of microorganisms are decomposed. The tidal flow mode of operation is also beneficial to the removal of phosphorus; the biological contact reaction tank keeps the advantageous anoxic/anaerobic environment, which is beneficial to the proceeding of the processes of denitrification and denitrogenation; the hydraulic retention time of each structure is short, pollutants enter the next treatment stage after being treated to a certain extent, and more pollutants are fully utilizedThe stage treatment achieves the high-efficiency sewage treatment effect;
(2) compared with a multi-stage combined wetland or a single biological contact reaction tank system, the composite device has the advantages of small occupied area and high utilization efficiency of water treatment structures; effluent of the sedimentation tank alternately enters one tidal flow wetland unit at certain running time intervals, so that the decontamination capacity of the two wetland units can be fully utilized, the wetland blockage is effectively delayed, and the service life of the wetland is prolonged;
(3) the utility model discloses set composite can supply low-cost plus carbon source in order to strengthen the denitrification effect to biological contact reaction tank according to the different C/N ratio of intaking, and plus carbon source can conveniently replace. The whole system has good adaptability to different water qualities and strong impact load resistance;
(4) the utility model adopts the biochar as the wetland substrate, which has strong nitrogen and phosphorus adsorption capacity, is beneficial to removing pollutants through adsorption, and the tidal operation mode is beneficial to recovering the adsorption capacity of the wetland substrate; meanwhile, the biochar has a larger specific surface area, so that a favorable space can be provided for the attachment of microorganisms, and the efficiency of removing pollutants through a microbial way is enhanced; the application of the biochar can also improve the survival rate and the growth vigor of wetland plants at the initial stage of field planting and reduce the discharge amount of greenhouse gases under the unit pollutant removal amount of a wetland system;
(5) the utility model has less energy consumption during the operation of the compound device; different water treatment structures are placed at different heights to form a potential difference, and sewage can flow into the next-stage water treatment structure by gravity in most stages of the whole process; the whole system only uses one sewage lifting water pump, so that the power consumption and the purchase and maintenance cost of electrical equipment are reduced.
Drawings
FIG. 1 is a structural schematic diagram of a tidal flow constructed wetland coupling biological contact reaction tank composite device and sewage flow direction (water enters from a tidal flow wetland unit I and exits from a tidal flow wetland unit II);
FIG. 2 is a structural schematic diagram of a tidal flow constructed wetland coupling biological contact reaction tank composite device and sewage flow direction (water enters from a tidal flow wetland unit II and water exits from a tidal flow wetland unit I);
in the figure: 1-tidal flow artificial wetland unit I, 2-wetland plants, 3-electronic valves, 4-sedimentation tank, 5-timing switch, 6-cross bar, 7-biological contact reaction tank, 8-water distributor, 9-sludge bucket, 10-biofilm filler, 11-slow release carbon source bag, 12-water pump and 13-tidal flow artificial wetland unit II.
Detailed Description
The present invention will be further described with reference to the following detailed description.
Example 1: as shown in fig. 1, a tidal flow constructed wetland coupling biological contact reaction tank composite sewage treatment device comprises a tidal flow wetland unit I1, a tidal flow wetland unit II 13, a sedimentation tank 4 and a biological contact reaction tank 7, wherein the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are arranged in parallel, a water outlet pipe I and a water outlet pipe II of the sedimentation tank 4 are respectively communicated with water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13, the water outlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are both communicated with the biological contact reaction tank 7, a water outlet pipe is arranged in the center of a tank body of the biological contact reaction tank 7, the water outlet pipe of the biological contact reaction tank 7 is respectively communicated with the water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13, and a sludge hopper 9 is arranged at the bottom of the biological contact reaction tank;
the bottom of the biological contact reaction tank 7 is provided with a water distributor 8, and water outlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are communicated with the water distributor 8; the bottom end of the sludge hopper 9 is externally connected with a sludge pump;
the water outlet pipe of the biological contact reaction tank 7 is provided with a timing switch 5 and a water pump 12, and the water outlet pipe of the biological contact reaction tank 7 is respectively communicated with the water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 through the water inlet pipe I and the water inlet pipe II.
Example 2: as shown in fig. 1, a tidal flow constructed wetland coupling biological contact reaction tank composite sewage treatment device comprises a tidal flow wetland unit I1, a tidal flow wetland unit II 13, a sedimentation tank 4 and a biological contact reaction tank 7, wherein the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are arranged in parallel, a water outlet pipe I and a water outlet pipe II of the sedimentation tank 4 are respectively communicated with water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13, the water outlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are both communicated with the biological contact reaction tank 7, a water outlet pipe is arranged in the center of a tank body of the biological contact reaction tank 7, the water outlet pipe of the biological contact reaction tank 7 is respectively communicated with the water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13, and a sludge hopper 9 is arranged at the bottom of the biological contact reaction tank;
the bottom of the biological contact reaction tank 7 is provided with a water distributor 8, and water outlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are communicated with the water distributor 8; the water distributor 8 is a pulse water distributor, and flushes the existing biological membrane when pulse water enters, so as to be beneficial to promoting the growth of a new biological membrane; the bottom end of the sludge hopper 9 is externally connected with a sludge pump;
a timing switch 5 and a water pump 12 are arranged on a water outlet pipe of the biological contact reaction tank 7, and the water outlet pipe of the biological contact reaction tank 7 is respectively communicated with water inlet pipes of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 through a water inlet pipe I and a water inlet pipe II;
an electronic gate 3 is arranged on the water outlet pipe I of the sedimentation tank 4, the water outlet pipe II of the sedimentation tank 4, the water outlet pipe of the tidal flow wetland unit I1, the water outlet pipe of the tidal flow wetland unit II 13, the water inlet pipe I and the water inlet pipe II;
a plurality of rows of biofilm fillers 10 are suspended in the biological contact reaction tank 7; the top end and the bottom end of the biological contact reaction tank 7 are both provided with cross bars 6, and the biological membrane filler 10 is suspended between the cross bars 6, and the suspension density is 9-12 strings/square meter;
the top of the biological contact reaction tank 7 is provided with a detachable opaque cover plate, the opaque cover plate is provided with a small hole for facilitating the escape of gas generated by sewage treatment, and the reaction tank is in a flooded state for a long time, thereby being beneficial to the implementation of denitrification and other processes;
the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are identical in structure and comprise a substrate and wetland plants 2, the wetland plants 2 are planted on the top of the substrate, a gravel bottom layer is filled at the bottom of the substrate, a gravel top layer is filled at the top of the substrate, and biochar particles are filled between the gravel bottom layer and the gravel top layer;
the gravel particle size of the gravel top layer is smaller than that of the gravel bottom layer; the bed packing of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 comprises small-particle-size gravel (5-10mm), large-particle-size gravel (10-30mm) and biochar particles (3-10mm), and the small-particle-size gravel is filled on the surface layer of the bed and occupies 1/3 of the whole bed volume; the biochar particles are filled in the middle of the bed body and occupy 1/3 of the whole bed body; large-particle-size gravel is filled in the lower layer of the bed body and occupies 1/3 of the whole volume of the bed body;
the inner walls of the sedimentation tank 4, the tidal flow wetland unit I1, the tidal flow wetland unit II 13 and the biological contact reaction tank 7 are all provided with impermeable layers, and the outer walls of the sedimentation tank, the tidal flow wetland unit I1 and the tidal flow wetland unit II are provided with water stop steel plate layers; the tank body is poured by using impervious concrete, and sewage can be prevented from seeping polluted soil and underground water after waterproof treatment;
the sewage enters a sedimentation tank in the composite device for pretreatment, then flows into the tidal flow wetland unit I1, stays for 3-6 hours for treatment, and then enters a biological contact reaction tank 7; emptying the tidal flow wetland unit I1 for 3-6 hours; before sewage of the tidal flow wetland unit I1 enters a biological contact reaction tank, pumping half volume of the treated sewage in the tank into another tidal flow artificial wetland unit II 13 in an idle period by a water pump for treatment for 3-6 hours, finally discharging the sewage, and emptying the tidal flow wetland unit II 13 for idle for 3-6 hours; when the tidal flow wetland unit II 13 drains water, the idle period of the tidal flow wetland unit I1 is ended, and water is introduced into the sedimentation tank again; the sewage treatment and emptying time of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are equal, but are in opposite sewage saturation treatment-emptying states, namely when the tidal flow wetland unit I1 is in a sewage saturation treatment state, the tidal flow wetland unit II 13 is in a sewage emptying state, and when the tidal flow wetland unit I1 is in a sewage emptying state, the tidal flow wetland unit II 13 is in a sewage saturation treatment state;
the length of the treatment and emptying idle time of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 is determined according to the concentration of pollutants in sewage, and the higher the sewage concentration is, the longer the emptying idle time is;
the sewage flows into the tidal flow wetland unit from the sedimentation tank and flows into the biological contact reaction tank from the tidal flow wetland unit through the electronic valve, and the sewage is controlled by gravity flow; sewage flows into another tidal flow wetland unit from the biological contact reaction tank and is lifted by a water pump; the time length of the water pump which is started each time is controlled to be 5-10 minutes.
And after the system operates for 1-2 months, the water outlet end of the sedimentation tank is changed into a tidal flow wetland unit II 13 from the tidal flow wetland unit I1, sewage is treated in the tidal flow wetland unit II 13 and then discharged into the biological contact reaction tank 7, and then enters the tidal flow wetland unit I1 for treatment and then discharged, and the circulation is carried out according to the treatment.
Example 3: as shown in fig. 1, the composite sewage treatment device of the tidal flow constructed wetland coupled biological contact reaction tank of the present embodiment has a structure substantially the same as that of the tidal flow constructed wetland coupled biological contact reaction tank of the embodiment 2, and the difference is that: the bed packing of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 comprises small-particle-size gravel (5-10mm), large-particle-size gravel (10-25mm) and biochar particles (3-10mm), and the small-particle-size gravel is filled on the surface layer of the bed and occupies 1/3 of the whole bed volume; the biochar particles are filled in the middle of the bed body and occupy 1/3 of the whole bed body; large-particle-size gravel is filled in the lower layer of the bed body and occupies 1/3 of the whole volume of the bed body; wetland plants of lythra scandens are planted on the upper part of the wetland, and water outlets of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are positioned at the bottom end of the large gravel packing; the biochar particles are obtained by pyrolyzing branches under oxygen deficiency at 400 ℃ for 2 hours;
the composite device comprises two groups of same tidal flow wetland units, as shown in figure 1, sewage firstly flows into a tidal flow wetland unit I1 under the action of gravity after being pretreated by precipitation and the like in a sedimentation tank 4, and after being treated for 3 hours, the sewage flows into a biological contact reaction tank 7 under the action of gravity and is distributed by a water distributor 8; emptying the tidal flow wetland unit I1 and carrying out idle reoxygenation for 3 hours; before sewage in the wetland unit I1 enters, half volume of sewage in the biological contact reaction tank 7 is lifted to another tidal flow wetland unit II 13 by a water pump 12; after the sewage of the tidal flow wetland unit I1 enters the biological contact reaction tank, the sewage in the tank body is still in a saturated state for treatment; the sewage stays in the tidal flow wetland unit II 13 for 3 hours and is finally discharged; at the moment, sewage in the sedimentation tank enters the tidal flow wetland unit I1 again to carry out treatment in the next period; emptying the tidal flow wetland unit II 13 and carrying out idle reoxygenation for 3 hours;
after the composite device operates for 1 month, the operation working condition is switched to the condition shown in figure 2, sewage firstly flows into a tidal flow wetland unit II 13 for treatment for 3 hours after being pretreated by precipitation and the like, and then flows into a biological contact reaction tank 7 under the action of gravity; emptying the tidal flow wetland unit II 13 and carrying out idle reoxygenation for 3 hours; before sewage in the tidal flow wetland unit II 13 enters, lifting half volume of sewage in the biological contact reaction tank 7 to the other tidal flow wetland unit I1 by a water pump; after the sewage of the tidal flow wetland unit II 13 enters the biological contact reaction tank, the sewage in the tank body is still in a saturated state for treatment; the sewage stays in the tidal flow wetland unit I1 for 3 hours and is finally discharged; at the moment, the sewage in the sedimentation tank enters the tidal flow wetland unit II 13 again for the treatment of the next period. The tidal flow wetland unit I1 is emptied and idled for reoxygenation for 3 hours.
Example 4: as shown in fig. 1, the composite sewage treatment device of the tidal flow constructed wetland coupled biological contact reaction tank of the present embodiment has a structure substantially the same as that of the tidal flow constructed wetland coupled biological contact reaction tank of the embodiment 2, and the difference is that: in order to treat low C/N sewage, a slow-release carbon source bag 11 is suspended in the biological contact reaction tank 7 to provide a carbon source required by denitrification for the low C/N ratio sewage, and the slow-release carbon source can be a biomass carbon source such as reed straws and the like; the bed packing of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 comprises small-particle-size gravel (5-10mm), large-particle-size gravel (15-30mm) and biochar particles (3-10mm), and the small-particle-size gravel is filled on the surface layer of the bed and occupies 1/3 of the whole bed volume; the biochar particles are filled in the middle of the bed body and occupy 1/3 of the whole bed body; large-particle-size gravel is filled in the lower layer of the bed body and occupies 1/3 of the whole volume of the bed body; wetland plant reeds are planted on the upper part of the wetland, and the water outlets of the tidal flow wetland unit I1 and the tidal flow wetland unit II 13 are positioned at the bottom end of the large gravel packing; the biochar particles are obtained by carrying out anoxic pyrolysis on reed straws at 400 ℃ for 2 hours;
the composite device comprises two groups of same tidal flow wetland units, as shown in figure 1, sewage firstly flows into a tidal flow wetland unit I1 under the action of gravity after being pretreated by precipitation and the like in a sedimentation tank 4, after being treated for 5 hours, the sewage flows into a biological contact reaction tank 7 under the action of gravity and is distributed by a water distributor 8, and the formed aged biological membrane is washed away in the water distribution process of the water distributor 8; emptying the tidal flow wetland unit I1 and carrying out idle reoxygenation for 5 hours; before sewage in the wetland unit I1 enters, half volume of sewage in the biological contact reaction tank 7 is lifted to another tidal flow wetland unit II 13 by a water pump 12; after the sewage of the tidal flow wetland unit I1 enters the biological contact reaction tank, the sewage in the tank body is still in a saturated state for treatment; the sewage stays in the tidal flow wetland unit II 13 for 5 hours and is finally discharged; at the moment, sewage in the sedimentation tank enters the tidal flow wetland unit I1 again for the treatment of the next period. Emptying the tidal flow wetland unit II 13 and carrying out idle reoxygenation for 5 hours;
after the system operates for 2 months, the operation working condition is switched to the mode shown in figure 2, sewage firstly flows into a tidal flow wetland unit II 13 for treatment for 5 hours after being pretreated by precipitation and the like, and then flows into a biological contact reaction tank 7 under the action of gravity; emptying the tidal flow wetland unit II 13 and carrying out idle reoxygenation for 5 hours; before sewage in the tidal flow wetland unit II 13 enters, lifting half volume of sewage in the biological contact reaction tank 7 to the other tidal flow wetland unit I1 by a water pump; after the sewage of the tidal flow wetland unit II 13 enters the biological contact reaction tank, the sewage in the tank body is still in a saturated state for treatment; the sewage stays in the tidal flow wetland unit I1 for 5 hours and is finally discharged; at the moment, the sewage in the sedimentation tank enters the tidal flow wetland unit II 13 again for carrying out the treatment of the next period; the tidal flow wetland unit I1 is emptied and idled for reoxygenation for 5 hours.
While the present invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. The composite sewage treatment device of the tidal flow artificial wetland coupling biological contact reaction tank is characterized in that: the device comprises a tidal flow wetland unit I (1), a tidal flow wetland unit II (13), a sedimentation tank (4) and a biological contact reaction tank (7), wherein the tidal flow wetland unit I (1) and the tidal flow wetland unit II (13) are arranged in parallel, a water outlet pipe I and a water outlet pipe II of the sedimentation tank (4) are respectively communicated with the tidal flow wetland unit I (1) and a water inlet pipe of the tidal flow wetland unit II (13), the tidal flow wetland unit I (1) and the water outlet pipe of the tidal flow wetland unit II (13) are respectively communicated with the biological contact reaction tank (7), a water outlet pipe is arranged at the center of the biological contact reaction tank (7), the water outlet pipe of the biological contact reaction tank (7) is respectively communicated with the tidal flow wetland unit I (1) and the water inlet pipe of the tidal flow wetland unit II (13), and a sludge hopper (9) is arranged at the bottom of the biological contact reaction tank (.
2. The composite sewage treatment device of the tidal flow artificial wetland coupled biological contact reaction tank, which is characterized in that: the bottom of the biological contact reaction tank (7) is provided with a water distributor (8), and water outlet pipes of the tidal flow wetland unit I (1) and the tidal flow wetland unit II (13) are communicated with the water distributor (8).
3. The composite sewage treatment device of the tidal flow artificial wetland coupled biological contact reaction tank, which is characterized in that: the bottom end of the sludge hopper (9) is externally connected with a sludge pump.
4. The composite sewage treatment device of the tidal flow artificial wetland coupled biological contact reaction tank, which is characterized in that: a timing switch (5) and a water pump (12) are arranged on a water outlet pipe of the biological contact reaction tank (7), and the water outlet pipe of the biological contact reaction tank (7) is communicated with water inlet pipes of the tidal flow wetland unit I (1) and the tidal flow wetland unit II (13) through a water inlet pipe I and a water inlet pipe II respectively.
5. The composite sewage treatment device of the tidal flow constructed wetland coupled biological contact reaction tank, which is characterized in that: and an electronic gate (3) is arranged on the water outlet pipe I of the sedimentation tank (4), the water outlet pipe II of the sedimentation tank (4), the water outlet pipe of the tidal flow wetland unit I (1), the water outlet pipe of the tidal flow wetland unit II (13), the water inlet pipe I and the water inlet pipe II.
6. The composite sewage treatment device of the tidal flow artificial wetland coupled biological contact reaction tank, which is characterized in that: a plurality of rows of biofilm fillers (10) are suspended in the biological contact reaction tank (7).
7. The composite sewage treatment device of the tidal flow artificial wetland coupled biological contact reaction tank, which is characterized in that: a slow-release carbon source bag (11) is arranged in the biological contact reaction tank (7) in a hanging way.
8. The composite sewage treatment device of the tidal flow artificial wetland coupled biological contact reaction tank, which is characterized in that: the tidal flow wetland unit I (1) and the tidal flow wetland unit II (13) are identical in structure and comprise matrixes and wetland plants (2), the wetland plants (2) are planted on the top of the matrixes, gravel bottom layers are filled at the bottoms of the matrixes, gravel top layers are filled at the tops of the matrixes, and biochar particles are filled between the gravel bottom layers and the gravel top layers.
9. The composite sewage treatment device of the tidal flow artificial wetland coupled biological contact reaction tank, which is characterized in that: the inner walls of the sedimentation tank (4), the tidal flow wetland unit I (1), the tidal flow wetland unit II (13) and the biological contact reaction tank (7) are all provided with impermeable layers, and the outer walls of the sedimentation tank and the tidal flow wetland unit II are provided with water stop steel plate layers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110745954A (en) * | 2019-11-28 | 2020-02-04 | 云南大学 | Composite sewage treatment device and method for tidal flow artificial wetland coupling biological contact reaction tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110745954A (en) * | 2019-11-28 | 2020-02-04 | 云南大学 | Composite sewage treatment device and method for tidal flow artificial wetland coupling biological contact reaction tank |
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