CN211339201U - Device for cooperatively treating biogas slurry and recycling resources through multiple processes - Google Patents
Device for cooperatively treating biogas slurry and recycling resources through multiple processes Download PDFInfo
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- CN211339201U CN211339201U CN201922101514.7U CN201922101514U CN211339201U CN 211339201 U CN211339201 U CN 211339201U CN 201922101514 U CN201922101514 U CN 201922101514U CN 211339201 U CN211339201 U CN 211339201U
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Abstract
The utility model discloses a device for coprocessing biogas slurry and recycling resources by multiple processes; the device comprises a natural settling pond, an ammonia stripping tank, a contact oxidation reaction pond, a flocculation pond and an artificial wetland which are connected in sequence, wherein a water inlet pipe is connected above the natural settling pond, a water outlet pipe is arranged at the top of the natural settling pond, the other end of the natural settling pond extends into the top of the ammonia stripping tank, a water outlet pipe and a gas outlet pipe are arranged at the top of the ammonia stripping tank, an anoxic pond of the contact oxidation reaction pond is connected with an aerobic pond through a return pipe, a sedimentation water outlet pipe is arranged at the top of a buffer sedimentation pond, and the other end of the buffer sedimentation pond extends into; the lower part of the side wall of the flocculation tank is connected with a liquid discharge pipe which is connected with the artificial wetland. The utility model is simple in operation, to the organic matter that contains in the natural pond liquid, elements such as nitrogen phosphorus all have better effect of getting rid of for natural pond liquid after the processing can reach the standard and discharge, can retrieve the partial nutrient element in the natural pond liquid simultaneously, as fertilizer reutilization, reduce cost on the basis of raising the efficiency.
Description
Technical Field
The utility model relates to a natural pond liquid treatment field, concretely relates to device of many technologies coprocessing natural pond liquid and recovery resources.
Background
In recent years, with the development of animal husbandry in China becoming faster and faster, biogas engineering is rapidly developed, and large-scale and intensive biogas engineering is increasing day by day. A large number of biogas projects relieve the problem of natural gas shortage in China, but also enable the discharge of effluent biogas slurry to be a new problem. At present, the treatment of biogas slurry is mainly 2 types, one is to directly return the biogas slurry to the field after dilution, so that the water consumption is high, and the farmland is polluted due to the long-time accumulation of pollutants in the biogas slurry; and the other method is to reduce the content of pollutants in the biogas slurry through process treatment, so that the biogas slurry can reach the standard and then be discharged.
Currently, biogas slurry treatment mainly comprises a Sequencing Batch Reactor (SBR) method, a flocculation process and the like. The traditional SBR process generally has the defects of high energy consumption, poor treatment effect and the like, and the discharged excess sludge also needs to be further treated, so that the treatment cost is increased; the traditional flocculation process takes polyaluminium chloride and polyacrylamide as a flocculating agent and a coagulant aid, if a flocculation product is directly used as a fertilizer to be piled in a field, the accumulation phenomenon of heavy metals and toxic substances can be generated, and the environment and the human body can be damaged after long-term use, so that the improvement of the existing process is still needed at present.
Disclosure of Invention
The utility model discloses a purpose is then poor in order to solve present natural pond liquid treatment process's effect, and the problem that the energy consumption is high provides a device of many technologies coprocessing liquid and recovery resources, and the device easy operation to the organic matter that contains in the natural pond liquid, elements such as nitrogen phosphorus all have better effect of getting rid of for natural pond liquid after the processing can reach the standard and discharge, can retrieve partial nutrient element in the natural pond liquid simultaneously, as fertilizer reutilization, reduce cost on the basis of raising the efficiency.
In order to realize the purpose, the utility model designs a device for multi-process cooperative treatment of biogas slurry and resource recovery, which comprises a natural settling tank, an ammonia stripping tank, a contact oxidation reaction tank, a flocculation tank and an artificial wetland which are connected in sequence, wherein a water inlet pipe is connected above the natural settling tank, a water outlet pipe is arranged at the top of the natural settling tank, one end of the water outlet pipe is inserted into the bottom of the natural settling tank, the other end of the water outlet pipe extends into the top of the ammonia stripping tank, a water outlet pipe and a gas outlet pipe are arranged at the top of the ammonia stripping tank, one end of the water outlet pipe is inserted into the bottom of the ammonia stripping tank, the other end of the water outlet pipe extends into the contact oxidation reaction tank, the,
the contact oxidation reaction tank is equally divided into four sections of tank chambers by double partition plates; and the upper part and the lower part of the double partition plates are respectively provided with a gap to communicate the four sections of the tank chambers; the front section of the four-section tank chamber of the contact oxidation reaction tank is an aerobic tank, the third section is a buffer sedimentation tank, the fourth section is an anoxic tank,
the bottom surface of the buffer sedimentation tank is an inclined surface, the bottom of the buffer sedimentation tank is provided with a sludge discharge port, the anoxic tank is connected with the aerobic tank through a return pipe, one end of the return pipe is connected with the top of the anoxic tank, the other end of the return pipe is inserted into the bottom of the aerobic tank, the top of the buffer sedimentation tank is provided with a sedimentation water outlet pipe, one end of the sedimentation water outlet pipe is inserted into the bottom of the buffer sedimentation tank, and the other end of the sedimentation water outlet pipe extends into the; a sludge discharge port is formed in the bottom of the flocculation tank, a flocculating agent storage tank is arranged at the top of the flocculation tank, a liquid discharge pipe is connected to the lower part of the side wall of the flocculation tank, and the liquid discharge pipe is connected with the artificial wetland; one side of the artificial wetland is connected with a wetland water outlet pipe.
Further, an air inlet pipe is arranged at the top of the ammonia stripping tank, and one end of the air inlet pipe is connected with an air pump; the other end of the air inlet pipe is connected with a plurality of branch air inlet pipes; and a heating plate is arranged at the bottom of the ammonia stripping tank.
Furthermore, the anoxic tank and the two aerobic tanks are both provided with double rows of fillers.
And furthermore, aeration heads are arranged at the bottoms of the aerobic tank and the anoxic tank and are communicated with an air pump through aeration air inlet pipes.
Furthermore, gas flow meters are arranged on aeration air inlet pipes between the aeration heads and the air pumps of the aerobic tank and the anoxic tank; and stirrers are arranged at the top of the ammonia stripping tank and the top of the flocculation tank.
And furthermore, water pumps are arranged on the water outlet pipe, the water drain pipe, the return pipe and the sedimentation water outlet pipe.
Furthermore, canna is planted in the artificial wetland with the area of 10m3The Hydraulic Retention Time (HRT) was 7 days.
The method for performing biogas slurry advanced treatment and resource recycling based on the device comprises the following steps:
1) the biogas slurry firstly enters a natural sedimentation tank for natural sedimentation, settled solid particles in the biogas slurry are discharged, and the biogas slurry enters an ammonia stripping tank through a water outlet pipe after the sedimentation is finished;
2) adjusting a heating plate at the bottom of an ammonia stripping tank, heating the biogas slurry to 55 ℃, simultaneously pumping air into the tank by an air pump and an air inlet pipe, starting stirring, collecting the blown ammonia gas through a gas collecting bottle, completing stripping, and then discharging the treated biogas slurry into a contact oxidation reaction tank through a drain pipe;
3) the biogas slurry is subjected to full nitration reaction in an aerobic tank of the second section, then dissolved oxygen is reduced in a buffer sedimentation tank, then the biogas slurry enters an anoxic tank for denitrification reaction, the reacted biogas slurry flows back to the aerobic tank of the first section through a return pipe for second period treatment, the biogas slurry treated by the second period flows back to the aerobic tank of the second section again, the biogas slurry is subjected to reaction in the aerobic tank of the second section and then enters the buffer sedimentation tank for sedimentation, and supernatant enters a flocculation tank through a sedimentation water outlet pipe;
4) adding a flocculating agent in a flocculating agent storage tank into a flocculation tank, simultaneously starting stirring to quickly flocculate and precipitate organic matters and nitrogen and phosphorus elements in the biogas slurry, discharging the precipitated liquid into the artificial wetland through a liquid discharge pipe, and discharging and collecting flocculates through a sludge discharge port to be used as organic fertilizer;
5) the biogas slurry is further treated in the artificial wetland and then discharged by a wetland water outlet pipe.
In the step 2), the mark of the completion of the stripping is that the ratio of COD to TN in the biogas slurry is 7-8, the pumping air flow is 40-50L/min, sulfuric acid with the concentration of 5% is in the gas collection bottle 9, and the speed of the stirrer is 100-150 r/min.
In the step 3), the concentration of dissolved oxygen in the aerobic pool is 2.5-3.5mg/L, the hydraulic retention time of each pool is 2 hours, and the total hydraulic retention time is 16 hours;
in the step 4), the speed of the stirrer is 150r/min, the stirring time is 10min, the settling time is 30min, the flocculating agent is a biological flocculating agent prepared from sludge and hydrochloric acid, and the dosage of the flocculating agent is 25 ml/L.
The utility model has the advantages that:
the utility model discloses a device and method mainly used reduce the organic matter of wherein most to the processing of pig farm anaerobism play water natural pond liquid, and elements such as nitrogen phosphorus carry out the recycle of resource on making its basis that can discharge to reach standard, specifically do:
1) the utility model discloses earlier blow to take off technology through ammonia and handle natural pond liquid, improve the carbon-nitrogen ratio of natural pond liquid on the basis of getting rid of partial ammonia nitrogen, and then improve the biodegradability of natural pond liquid for subsequent biological treatment effect improves by a wide margin.
2) The utility model discloses a carry out further improvement to the contact oxidation pond, combine intermittent type aeration technology and contact oxidation technology, further prevent the mud inflation, reduced surplus sludge's production, improved denitrification efficiency on the basis of guaranteeing the nitration ability, and then improved the clearance of total nitrogen, through controlling into water carbon-nitrogen ratio, realized the short cut and nitrified moreover, further reduced the energy consumption, reduced the processing time.
3) The utility model discloses the flocculating agent that uses is organic polymeric flocculant, and is nontoxic, easily degrades, and the flocculation thing can directly be used for the compost, can not produce secondary pollution to the environment, does not have the difficult degradability and the shortcoming such as toxicity of traditional inorganic flocculating agent.
4) The utility model discloses blow off ammonia, the contact oxidation method combines with flocculation technology, utilizes the different characteristics coprocessing biogas slurry of several kinds of technologies, has improved the natural pond liquid treatment effect and has carried out the recycle of resource, is a new thinking of natural pond liquid treatment.
Drawings
FIG. 1 is a schematic diagram of a device for co-processing biogas slurry and recovering resources by multiple processes;
in the figure, a natural settling tank 1, a water inlet pipe 1.1, an ammonia stripping tank 2, a heating plate 2.1, a contact oxidation reaction tank 3, a double partition plate 3.1, an aerobic tank 3.2, a buffer sedimentation tank 3.3, a sludge discharge port 3.31, an anoxic tank 3.4, a flocculation tank 4, a flocculation sludge discharge port 4.1, a liquid discharge pipe 4.2, an artificial wetland 5, a wetland water outlet pipe 5.1, a water outlet pipe 6, a water discharge pipe 7, a gas outlet pipe 8, a gas collection bottle 9, a return pipe 10, a sedimentation water outlet pipe 11, a flocculant storage tank 12, a gas inlet pipe 13, a branch gas inlet pipe 13.1, a gas pump 14, double-row fillers 15, an aeration head 16, an aeration gas inlet pipe 17, a gas flowmeter 18, a stirrer 19 and.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments so that those skilled in the art can understand the invention.
The device for the multi-process cooperative treatment of biogas slurry and resource recovery as shown in figure 1 comprises a natural settling pond 1, an ammonia stripping tank 2, a contact oxidation reaction pond 3, a flocculation tank 4 and an artificial wetland 5 which are connected in sequence, wherein a water inlet pipe 1.1 is connected above the natural settling pond 1, a water outlet pipe 6 is arranged at the top of the natural settling pond 1, one end of the water outlet pipe 6 is inserted into the bottom of the natural settling pond 1, the other end of the water outlet pipe extends into the top of the ammonia stripping tank 2, a water discharge pipe 7 and a gas outlet pipe 8 are arranged at the top of the ammonia stripping tank 2, one end of the water discharge pipe 7 is inserted into the bottom of the ammonia stripping tank, the other end of the water discharge pipe 7 extends into the contact oxidation reaction,
an air inlet pipe 13 is arranged at the top of the ammonia stripping tank 2, and one end of the air inlet pipe 13 is connected with an air pump 14; the other end of the air inlet pipe 13 is connected with a plurality of branch air inlet pipes 13.1; a heating plate 2.1 is arranged at the bottom of the ammonia stripping tank 2;
the contact oxidation reaction tank 3 is equally divided into four sections of tank chambers by double clapboards 3.1; and the upper and lower parts of the double partition plates 3.1 are respectively provided with gaps to communicate the four sections of the tank chambers; the front 2 sections of four sections of tank chambers of the contact oxidation reaction tank 3 are aerobic tanks 3.2, the third section is a buffer sedimentation tank 3.3, the fourth section is an anoxic tank 3.4, and double rows of fillers 15 are filled in the anoxic tank 3.4 and the two aerobic tanks 3.2; the bottom parts of the aerobic tank 3.2 and the anoxic tank 3.4 are provided with aeration heads 16, and the aeration heads 16 are communicated with an air pump 14 through aeration air inlet pipes 17; an air flow meter 18 is arranged on an aeration air inlet pipe 17 between an aeration head 16 and an air pump 14 of the aerobic tank 3.2 and the anoxic tank 3.4; the top parts of the ammonia stripping tank 2 and the flocculation tank 4 are both provided with a stirrer 19;
the bottom surface of the buffer sedimentation tank 3.3 is an inclined surface, the bottom of the buffer sedimentation tank is provided with a sludge discharge port 3.31, the anoxic tank 3.4 is connected with the aerobic tank 3.2 through a return pipe 10, one end of the return pipe 10 is connected with the top of the anoxic tank 3.4, the other end of the return pipe is inserted into the bottom of the aerobic tank 3.2, the top of the buffer sedimentation tank 3.3 is provided with a sedimentation water outlet pipe 11, one end of the sedimentation water outlet pipe 11 is inserted into the bottom of the buffer sedimentation tank 3.3, and the other end of the sedimentation water outlet; a flocculation sludge discharge port 4.1 is formed at the bottom of the flocculation tank 4, a flocculant storage tank 12 is arranged at the top of the flocculation tank 4, a liquid discharge pipe 4.2 is connected to the lower part of the side wall of the flocculation tank 4, and the liquid discharge pipe 4.2 is connected with the artificial wetland 5; the water outlet pipe 3, the water outlet pipe 7, the return pipe 10 and the sedimentation water outlet pipe 11 are all provided with a water pump 20.
One side of the artificial wetland 5 is connected with a wetland water outlet pipe 5.1. Canna planted in the artificial wetland 5 with the area of 10m3The hydraulic retention time was 7 days.
Based on the device, the advanced treatment and resource recycling of 100L biogas slurry are carried out, and the method comprises the following steps:
1) the biogas slurry firstly enters a natural sedimentation tank 1, natural sedimentation is carried out to remove part of insoluble substances, and then the biogas slurry enters an ammonia stripping tank 2 through a water pump 20;
2) after water inflow is finished, the air pump 14 is started to pump air into the tank, the air flow rate is 40L/min, the heating plate 2.1 is started at the same time, the temperature is controlled to be constant at 55 ℃, biogas slurry blowing-off is started, the top stirrer 19 is started, and the set rotating speed is 150 r/min. In the stripping process, a large amount of ammonia gas enters a gas collecting bottle 9 through an air outlet pipe 8, and contacts with sulfuric acid to react to generate ammonium sulfate which is collected; 3) blowing off is completed after 6 hours, the C/N in the biogas slurry is 7-8 at the moment, blowing off is stopped, and 25L of biogas slurry is pumped into a first section aerobic tank 3.2 of a contact oxidation reaction tank 3 through a water pump 20; opening the air pump 14 to start aeration to the contact oxidation reaction tank 3, controlling the DO concentration in the first section aerobic tank 3.2 to be 2.5-3.5mg/L, starting nitration reaction on the biogas slurry in the tank, opening the water pump 20 to continue pumping the biogas slurry after aeration for 2h, and then gradually pushing the biogas slurry in the tank and flowing into the second section aerobic tank 3.2 from the bottom through the diversion effect of the double partition plates 3.1 to continue aeration;
4) after continuing aeration for 2 hours, aerating the biogas slurry in the first section aerobic tank 3.2 for 2 hours, aerating the biogas slurry in the second section aerobic tank 3.2 for 4 hours, opening the water pump 20 again, pumping 25L of biogas slurry into the first section aerobic tank 3.2, pushing the biogas slurry in the second section aerobic tank 3.2 into the buffer sedimentation tank 3.3, and continuously aerating the biogas slurry in the original first section aerobic tank 3.2 into the second section aerobic tank 3.2;
5) continuing aerating for 2 hours, then greatly reducing the DO concentration of the biogas slurry in the buffer sedimentation tank 3.3, aerating the biogas slurry in the first section of aerobic tank 3.2 for 2 hours, aerating the biogas slurry in the second section of aerobic tank 3.2 for 4 hours, then opening the water pump 20 again, pumping 25L of biogas slurry into the first section of aerobic tank 3.2, pushing the biogas slurry in the original tank to the next tank again, pushing the biogas slurry in the buffer sedimentation tank 3.3 into the anoxic tank 3.4 to start denitrification, and controlling the DO concentration in the anoxic tank 3.4 to be 0.2-0.5 mg/L;
6) after the reaction is continued for 2 hours, the water pump 20 is opened, the biogas slurry in the anoxic tank 3.4 flows back to the first section aerobic tank 3.2 through the return pipe 10, and the reaction of the second period is started. After the second period of reaction is finished, the biogas slurry continuously flows back to the first section aerobic tank 3.2 to carry out the third period of reaction, when the second section aerobic tank 3.2 is finished, the biogas slurry is pushed into the buffer sedimentation tank 3.3, the water pump 20 is opened after 2h of sedimentation, and the biogas slurry is discharged into the flocculation tank 4; the residual sludge is discharged and collected through a sludge discharge port 3.31 at the bottom of the buffer sedimentation tank 3.3; at the moment, the effluent biogas slurry undergoes 12h of nitration reaction and 4h of denitrification reaction, so that COD and TN are greatly reduced;
7) after the water inflow of the flocculation tank 4 is finished, opening a flocculant storage tank 12, pouring a flocculant and biogas slurry into the flocculation tank 4 in a ratio of 1:40, fully mixing the flocculant and the biogas slurry by stirring, stopping stirring after 10min, settling for 30min, opening a liquid discharge pipe 4.2, discharging supernatant into the artificial wetland 5, discharging flocculates through a flocculation sludge discharge port 4.1, collecting the flocculates, and using the flocculates as compost fertilizer;
8) the biogas slurry is further treated in the artificial wetland 5 and is discharged from a wetland water outlet pipe 5.1 after 7 days.
After the biogas slurry is treated by the method, the test shows that insoluble substances and suspended substances in the biogas slurry are basically and completely removed, the COD concentration is 224mg/L, the TN concentration is 71mg/L, and NH is generated3The concentration was 14mg/L and the TP concentration was 3 mg/L.
Other parts not described in detail are prior art. Although the above embodiments have been described in detail, it is only a part of the embodiments of the present invention, rather than all embodiments, and other embodiments can be obtained without inventive step according to the present embodiments.
Claims (7)
1. A device for coprocessing biogas slurry and recycling resources in a multi-process manner is characterized in that: it comprises a natural settling pond (1), an ammonia stripping tank (2), a contact oxidation reaction tank (3), a flocculation tank (4) and an artificial wetland (5) which are connected in sequence, wherein a water inlet pipe (1.1) is connected above the natural settling pond (1), a water outlet pipe (6) is arranged at the top of the natural settling pond (1), one end of the water outlet pipe (6) is inserted into the bottom of the natural settling pond (1), the other end of the water outlet pipe is extended into the top of the ammonia stripping tank (2), a water outlet pipe (7) and a gas outlet pipe (8) are arranged at the top of the ammonia stripping tank (2), one end of the water outlet pipe (7) is inserted into the bottom of the ammonia stripping tank, the other end of the water outlet pipe (8) is inserted into the bottom of a gas collecting bottle (9),
the contact oxidation reaction tank (3) is equally divided into four sections of tank chambers through double partition plates (3.1); and the upper part and the lower part of the double partition plate (3.1) are respectively provided with a gap to communicate the four sections of the tank chambers; the front 2 sections of the four sections of the tank chambers of the contact oxidation reaction tank (3) are aerobic tanks (3.2), the third section is a buffer sedimentation tank (3.3), the fourth section is an anoxic tank (3.4),
the bottom surface of the buffer sedimentation tank (3.3) is an inclined surface, the bottom of the buffer sedimentation tank is provided with a sludge discharge port (3.31), the anoxic tank (3.4) is connected with the aerobic tank (3.2) through a return pipe (10), one end of the return pipe (10) is connected with the top of the anoxic tank (3.4), the other end of the return pipe is inserted into the bottom of the aerobic tank (3.2), the top of the buffer sedimentation tank (3.3) is provided with a sedimentation water outlet pipe (11), one end of the sedimentation water outlet pipe (11) is inserted into the bottom of the buffer sedimentation tank (3.3), and the other end of the sedimentation water outlet pipe extends into the flocculation tank (4) from the; a flocculation sludge discharge port (4.1) is formed in the bottom of the flocculation tank (4), a flocculant storage tank (12) is arranged at the top of the flocculation tank (4), a liquid discharge pipe (4.2) is connected to the lower portion of the side wall of the flocculation tank (4), and the liquid discharge pipe (4.2) is connected with the artificial wetland (5); one side of the artificial wetland (5) is connected with a wetland water outlet pipe (5.1).
2. The device for the multi-process cooperative treatment of biogas slurry and resource recovery according to claim 1, is characterized in that: an air inlet pipe (13) is arranged at the top of the ammonia stripping tank (2), and one end of the air inlet pipe (13) is connected with an air pump (14); the other end of the air inlet pipe (13) is connected with a plurality of branch air inlet pipes (13.1); and a heating plate (2.1) is arranged at the bottom of the ammonia stripping tank (2).
3. The device for the multi-process cooperative treatment of biogas slurry and resource recovery according to claim 1, is characterized in that: the anoxic tank (3.4) and the two aerobic tanks (3.2) are both provided with double rows of fillers (15).
4. The device for the multi-process cooperative treatment of biogas slurry and resource recovery according to claim 1, is characterized in that: the bottom parts of the aerobic tank (3.2) and the anoxic tank (3.4) are provided with aeration heads (16), and the aeration heads (16) are communicated with an air pump (14) through aeration air inlet pipes (17).
5. The device for the multi-process cooperative treatment of biogas slurry and resource recovery according to claim 1, is characterized in that: gas flow meters (18) are respectively arranged on aeration air inlet pipes (17) between aeration heads (16) and air pumps (14) of the aerobic tank (3.2) and the anoxic tank (3.4); and stirrers (19) are arranged at the tops of the ammonia stripping tank (2) and the flocculation tank (4).
6. The device for the multi-process cooperative treatment of biogas slurry and resource recovery according to claim 1, is characterized in that: and the water outlet pipe (6), the water outlet pipe (7), the return pipe (10) and the sedimentation water outlet pipe (11) are all provided with a water pump (20).
7. The device for the multi-process cooperative treatment of biogas slurry and resource recovery according to claim 1, is characterized in that: canna planted in the artificial wetland (5) with the area of 10m3The hydraulic retention time was 7 days.
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| CN110862194A (en) * | 2019-11-27 | 2020-03-06 | 华中农业大学 | Device and method for cooperatively treating biogas slurry and recycling resources through multiple processes |
| CN110862194B (en) * | 2019-11-27 | 2024-04-30 | 华中农业大学 | Device and method for cooperatively treating biogas slurry and recycling resources through multiple processes |
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