CN209890347U - Rural domestic sewage treatment's of kitchen garbage combination device - Google Patents
Rural domestic sewage treatment's of kitchen garbage combination device Download PDFInfo
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- CN209890347U CN209890347U CN201920267699.6U CN201920267699U CN209890347U CN 209890347 U CN209890347 U CN 209890347U CN 201920267699 U CN201920267699 U CN 201920267699U CN 209890347 U CN209890347 U CN 209890347U
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Abstract
The utility model provides a device and method for treating rural domestic sewage by combining kitchen waste, the device comprises: the system comprises a water storage tank, an AAO system, a secondary sedimentation tank, a fermentation mixed liquid reflux system, a secondary effluent drainage system and a sludge drainage system, wherein the water storage tank is communicated with the AAO system which is communicated with the secondary sedimentation tank; the secondary sedimentation tank is provided with a water outlet for discharging secondary effluent in the secondary sedimentation tank; the kitchen waste pretreatment tank is arranged in the fermentation tank and used for pretreating kitchen waste and releasing the pretreated kitchen waste into fermentation mixed liquid in the fermentation tank for fermentation. Through the technical scheme, domestic sewage treatment and kitchen waste treatment are combined, domestic sewage and kitchen waste in villages and small towns are removed simultaneously, and a novel approach is provided for harmlessness, reduction and recycling of the domestic sewage and the kitchen waste in the villages and small towns.
Description
Technical Field
The utility model relates to a villages and small towns sewage treatment technical field, concretely relates to rural domestic sewage treatment's of kitchen garbage combination device is mainly applicable to decentralized rural sewage treatment and middle-size and small-size cities and towns sewage treatment.
Background
With the development of new rural areas, the quality of life of residents in rural areas is also improved day by day, but meanwhile, the sewage discharge amount of villages and towns and the yield of kitchen waste are also increased day by day. According to statistics, domestic sewage is generated by about more than 80 hundred million tons every year in villages and towns in China, wherein 96% of villages do not have drainage channels and sewage treatment systems; more than 2000 million tons of kitchen waste are generated every year in villages and towns in China, and more than 90% of the kitchen waste is treated by landfill, incineration and feed conversion technologies. The random discharge of domestic sewage in villages and towns causes serious negative effects on agricultural ecological environment and water body environment, and directly threatens the physical health of villagers and the economic development of rural areas. The environmental and health problems caused by the disposal of kitchen waste in villages and small towns through landfill, incineration and feeding of poultry are also increasing. Particularly, the incidents of avian influenza, African swine fever, dioxin, foot and mouth disease and mad cow disease outbreak in European countries cause high importance of governments of various countries, developed countries have been put into law, and kitchen waste which is not subjected to harmless treatment is strictly forbidden to be used for feeding ruminant poultry, and kitchen waste is strictly forbidden to be burnt.
At present, the method for treating sewage in villages and towns in China mainly adopts a combined process of physicochemical and biological treatment, and the effluent quality of the biological sewage treatment technology is difficult to reach the standard under the condition that an influent carbon source is difficult to ensure. Kitchen waste is an important component of town waste, and the development of villages and towns is hindered by the extremely high yield of the kitchen waste, while the traditional disposal mode cannot meet the stricter and stricter environmental standards. However, the kitchen waste fermentation product contains abundant organic matter components, and can meet the carbon source requirement in the biological sewage treatment process. Therefore, the carbon source supply by utilizing the kitchen waste fermentation product is favorable for reasonable disposal of the solid waste, and the pollutant removal performance of the biological sewage treatment system can be effectively improved, so that a novel pollutant control mode combining solid waste disposal and sewage treatment is realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rural domestic sewage treatment's of kitchen garbage combination device to solve prior art villages and small towns waste water treatment and kitchen garbage and handle the problem that is difficult to up to standard. The kitchen waste and rural domestic sewage combined treatment device is mainly applied to treatment of rural domestic sewage.
In order to achieve the above object, the utility model provides a rural domestic sewage treatment's device is united to kitchen garbage in an aspect, include: a water storage tank, an AAO system, a secondary sedimentation tank, a fermentation mixed liquid reflux system, a secondary effluent drainage system and a sludge drainage system,
the water storage tank is communicated with the AAO system, and the AAO system is communicated with the secondary sedimentation tank; the secondary sedimentation tank is provided with a water outlet for discharging secondary effluent in the secondary sedimentation tank; the fermentation tank is internally provided with a kitchen waste pretreatment tank for pretreating kitchen waste and releasing the pretreated kitchen waste into fermentation mixed liquid in the fermentation tank for fermentation;
the secondary effluent drainage system is used for conveying secondary effluent in the secondary sedimentation tank to the fermentation tank, the sludge drainage system is used for conveying residual sludge in the secondary sedimentation tank to the fermentation tank, and the fermentation mixed liquid backflow system is used for returning fermentation mixed liquid in the fermentation tank to the AAO system.
Optionally, the AAO system includes an anaerobic tank, an anoxic tank, and an aerobic tank, which are sequentially communicated, the water storage tank is communicated with the anaerobic tank, an air-lift type return pipe is arranged between the aerobic tank and the anoxic tank, and the air-lift type return pipe is used for returning the nitrified liquid in the aerobic tank to the anoxic tank;
the liquid inlet of the fermentation mixed liquid reflux system is communicated with the fermentation tank, and the liquid outlet of the fermentation mixed liquid reflux system is communicated with the anaerobic tank.
Optionally, the sludge drainage system has a sludge inlet and two sludge outlets, the sludge inlet is communicated with the secondary sedimentation tank, and the two sludge outlets are respectively communicated with the fermentation tank and the anaerobic tank.
Optionally, the device that rural domestic sewage was handled is united to kitchen garbage still includes: the aeration head is arranged at the bottom of the aerobic tank.
Optionally, a stainless steel heating air pipe is arranged in the fermentation tank, and the stainless steel heating air pipe is communicated with the air compressor.
Optionally, the device that rural domestic sewage was handled is united to kitchen garbage still includes: a PLC automatic control system;
the PLC automatic control system is electrically connected with the fermentation mixed liquid reflux system so as to control the reflux quantity and the reflux time period of the fermentation mixed liquid reflux system;
the PLC automatic control system is electrically connected with the secondary water outlet and drainage system so as to control the drainage quantity and the drainage time period of the secondary water outlet and drainage system;
the PLC automatic control system is electrically connected with the sludge drainage system so as to control the drainage quantity and the drainage time period of the sludge drainage system;
the PLC automatic control system is electrically connected with the air compressor to control the air supply quantity of the PLC automatic control system.
Optionally, stirrers are arranged in the anaerobic tank, the anoxic tank and the fermentation tank.
Optionally, a flow guide pipe is arranged in the secondary sedimentation tank, and the aerobic tank is communicated with the secondary sedimentation tank through the flow guide pipe.
Optionally, the communication port of the water storage tank and the anaerobic tank is arranged at the upper part of the water storage tank, the communication port of the anaerobic tank and the anoxic tank is arranged at the lower part of the anaerobic tank, and the communication port of the anoxic tank and the aerobic tank is arranged at the upper part of the anoxic tank.
The utility model discloses another aspect provides a processing method of rural domestic sewage treatment's of kitchen garbage combination device, includes following step:
s1, starting the AAO system: inoculating activated sludge and the AAO system, and controlling the concentration range of the activated sludge to be 3500-4500 mg/L; introducing domestic sewage into the water storage tank; adjusting parameters of the AAO system to enable the effluent of the water outlet to reach the standard;
s2, start-up fermenter: inoculating anaerobic fermentation sludge into a fermentation tank, and controlling the concentration range of the activated sludge to be 10000-20000 mg/L; periodically putting kitchen waste into the kitchen waste pretreatment tank for pretreatment, and periodically discharging the pretreated kitchen waste into a fermentation tank for fermentation;
s3, running AAO system and fermentor in series: and sludge is periodically conveyed into the fermentation tank through a sludge drainage system, secondary effluent in the secondary sedimentation tank is conveyed into the fermentation tank according to a preset proportion, and fermentation mixed liquor in the fermentation tank is periodically conveyed to the AAO system through a fermentation mixed liquor backflow system.
By adopting the technical scheme, domestic sewage treatment and kitchen waste treatment are combined, so that domestic sewage and kitchen waste in village and town areas are removed simultaneously, a novel approach is provided for harmlessness, reduction and recycling of the domestic sewage and the kitchen waste in the village and town, and greater economic benefit is further obtained; meanwhile, the efficient intensive treatment of rural sewage with less land occupation is realized through the optimized combination of the characteristics of the fermentation and sewage treatment processes.
Drawings
FIG. 1 is a schematic view of a device for treating rural domestic sewage by combining Chinese food and kitchen garbage according to an embodiment of the present invention.
Reference numerals:
10: a water storage tank; 11-domestic sewage inlet; 12-a slag discharge port;
20-AAO system; 21-an anaerobic tank; 22-anoxic tank; 23-an aerobic tank; 231-gas stripping return pipe;
30-a secondary sedimentation tank; 31-a water outlet; 32-a flow guide pipe;
40-a fermentation tank; 41-a kitchen waste pretreatment tank; 42-stainless steel heating air pipe; 43-residual sludge discharge port;
51-a fermentation mixed liquor reflux system; 52-a secondary effluent drainage system; 53-sludge drainage system;
60-an air compressor; 61-an aeration head;
70-PLC automatic control system;
81. 82, 83-stirrer.
Detailed Description
In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are some, but not all embodiments of the invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.
Referring to fig. 1, the present embodiment provides a device for treating rural domestic sewage by combining kitchen waste, including: a water storage tank 10, an AAO (Anaerobic-Oxic) system 20, a secondary sedimentation tank 30, a fermentation tank 40, a fermentation mixed liquid reflux system 51, a secondary effluent drainage system 52 and a sludge drainage system 53; wherein the reservoir 10 is in communication with the AAO system 20, and the AAO system 20 is in communication with the secondary sedimentation tank 30; the secondary sedimentation tank 30 is provided with a water outlet 31 for discharging secondary effluent in the secondary sedimentation tank 30; the fermentation tank 40 is internally provided with a kitchen waste pretreatment tank 41 for pretreating kitchen waste and releasing the pretreated kitchen waste into fermentation mixed liquid in the fermentation tank 40 for fermentation; the secondary effluent drainage system 52 is used for conveying the secondary effluent in the secondary sedimentation tank 30 to the fermentation tank 40, the sludge drainage system 53 is used for conveying the residual sludge in the secondary sedimentation tank 30 to the fermentation tank 40, and the fermentation mixed liquor backflow system 51 is used for returning the fermentation mixed liquor in the fermentation tank 40 to the AAO system 20. By adopting the technical scheme, domestic sewage treatment and kitchen waste treatment are combined, so that domestic sewage and kitchen waste in village and town areas are removed simultaneously, a novel approach is provided for harmlessness, reduction and recycling of the domestic sewage and the kitchen waste in the village and town, and greater economic benefit is further obtained; realizing the efficient intensive treatment of rural sewage with less land occupation. The kitchen waste and rural domestic sewage combined treatment device is mainly applied to treatment of rural domestic sewage.
In the above scheme, the AAO system 20 is a device for a sewage treatment process, can be used for secondary sewage treatment or tertiary sewage treatment, and has a good nitrogen and phosphorus removal effect. The water storage tank 10 is provided with a domestic sewage inlet 11 and a slag discharge port 12, domestic sewage enters the water storage tank 10 from the domestic sewage inlet 11, and sundries in the water storage tank 10 can be discharged through the slag discharge port 12.
The AAO system 20 specifically comprises an anaerobic tank 21, an anoxic tank 22 and an aerobic tank 23 which are sequentially communicated, the water storage tank 10 is communicated with the anaerobic tank 21, an air-lift type return pipe 231 is arranged between the aerobic tank 23 and the anoxic tank 22, the air-lift type return pipe 231 is used for returning nitrified liquid in the aerobic tank 23 to the anoxic tank 22, and the nitrified liquid is used for denitrification; the liquid inlet of the fermentation mixed liquid reflux system 51 is communicated with the fermentation tank 40, and the liquid outlet of the fermentation mixed liquid reflux system 51 is communicated with the anaerobic tank 21. Wherein, the anaerobic tank 21, the anoxic tank 22 and the aerobic tank 23 are communicated by adopting water flow holes which are staggered up and down, thereby ensuring the flow state; specifically, the method comprises the following steps: the communication port of the water storage tank 10 and the anaerobic tank 21 is arranged at the upper part of the water storage tank 10, the communication port of the anaerobic tank 21 and the anoxic tank 22 is arranged at the lower part of the anaerobic tank 21, and the communication port of the anoxic tank 22 and the aerobic tank 23 is arranged at the upper part of the anoxic tank 22. A stirrer 81 is provided in the anaerobic tank 21 for stirring the sludge in the anaerobic tank 21, and a stirrer 82 is provided in the anoxic tank 22 for stirring the sludge in the anoxic tank 22. The fermentation tank 40 is also provided with a stirrer 83 for stirring the sludge in the fermentation tank 40, the stirring mainly serving to promote microbial decomposition.
Further, the sludge drainage system 53 has a sludge inlet and two sludge outlets, the sludge inlet is communicated with the secondary sedimentation tank 30, and the two sludge outlets are respectively communicated with the fermentation tank 40 and the anaerobic tank 21, so that the residual sludge in the secondary sedimentation tank 30 can be discharged into the fermentation tank 40, and can also be discharged into the anaerobic tank 21 according to requirements, thereby improving the utilization rate of the sludge in the secondary sedimentation tank 30 and reducing the sludge discharge.
Further, rural domestic sewage treatment's of kitchen garbage combination device still includes: an air compressor 60 and an aeration head 61 communicated with the air compressor 60, wherein the aeration head 61 is arranged at the bottom of the aerobic tank 23. Air can be continuously supplied to the aerobic tank 23 through the air compressor 60 and the aeration head 61 to increase the oxygen content in the aerobic tank 23.
Further, a stainless steel heating air pipe 42 is arranged in the fermentation tank 40, and the stainless steel heating air pipe 42 is communicated with the air compressor 60. The heat energy generated by the air compressor 60 is transferred to the fermentation tank 40 through the stainless steel heating air pipe 42, and the fermentation temperature in the fermentation tank 40 is ensured. Thus, the air compressor 60 can be used both for supplying air to the aerobic tank 23 and for heating the fermentation tank 40. The bottom of the fermentation tank 40 is also provided with an excess sludge discharge port 43 for discharging excess sludge.
In order to conveniently control the fermentation mixed liquid backflow system 51, the secondary effluent drainage system 52, the sludge drainage system 53 and the air compressor 60, the device for treating the rural domestic sewage by combining the kitchen waste is also provided with a PLC automatic control system 70; control fermentation mixed liquor return system 51, second grade play water drainage system 52, mud drainage system 53 and air compressor 60 all with PLC autonomous system 70 electricity is connected, PLC autonomous system 70 can control the return flow volume and the backward flow period of fermentation mixed liquor return system 51, the drainage volume and the drainage period of second grade play water drainage system 52 the drainage volume and the drainage period of mud drainage system 53, and air compressor 60's air supply volume.
A draft tube 32 is arranged in the secondary sedimentation tank 30, and the aerobic tank 23 is communicated with the secondary sedimentation tank 30 through the draft tube 32.
Based on the introduction of the device for treating the kitchen waste and the rural domestic sewage, the embodiment also provides a treatment method of the device for treating the kitchen waste and the rural domestic sewage, which comprises the following steps:
s1, start AAO system 20: inoculating activated sludge into the AAO system 20, and controlling the concentration range of the activated sludge to be 3500-4500 mg/L; introducing domestic sewage into the water storage tank 10; adjusting various parameters of the AAO system 20 to enable the effluent of the water outlet 31 to reach the standard; the activated sludge contains nitrogen and phosphorus removal microorganisms, such as: can be used for inoculating the active sludge returned by the municipal sewage treatment plant.
Specifically, activated sludge returned by the municipal sewage treatment plant is inoculated into the AAO system 20, the concentration ranges of the sludge in the anaerobic tank 21, the anoxic tank 22 and the aerobic tank 23 are kept at 3500-4500mg/L, and meanwhile, domestic sewage is introduced into the water storage tank 10; the process of adjusting the various parameters of the AAO system 20 includes: starting the stirrer 81, the stirrer 82 and the air compressor 60, and respectively controlling the reflux ratio of the nitrifying liquid and the reflux ratio of the residual sludge to be about 300% and 100%; the volume of the anaerobic tank 21, the volume of the anoxic tank 22 and the volume of the aerobic tank 23 are 1:2:4, and the hydraulic retention time of the AAO system 20 is controlled to be 11-16h by adjusting the inflow rate; the concentration of the dissolved oxygen in the aerobic tank 23 is always controlled to be 1.5-2.5mg/L through a rotor flow meter; the sludge age of the AAO system 20 is controlled to be 20-30 days by adjusting the discharge amount of the excess sludge. The successful start-up of the AAO system 20 is marked by the system effluent COD < 50mg/L, NH4+N is less than 5mg/L, TN is less than 15mg/L, and TP is less than 1 mg/L. Wherein COD represents chemical oxygen demand; NH4+ -N represents the amount of ammonia nitrogen; TN represents the total nitrogen amount; TP represents the total phosphorus amount.
S2, start-up fermentor 40: inoculating anaerobic fermentation sludge into the fermentation tank 40, and controlling the concentration range of the activated sludge to 10000-20000 mg/L; the anaerobic fermentation sludge can meet the requirement of anaerobic fermentation, and can be generally inoculated with the concentrated sludge of an urban sewage treatment plant; then, regularly putting the kitchen waste into the kitchen waste pretreatment tank 41 for pretreatment, and regularly discharging the pretreated kitchen waste into a fermentation tank 40 for fermentation;
specifically, the concentrated sludge of the municipal sewage treatment plant is inoculated into the fermentation tank 40, the concentration of the sludge in the fermentation tank is kept at 10000-20000mg/L, and then the stirrer 83 is started to stir under anaerobic conditions; collecting a certain amount of kitchen waste into a kitchen waste pretreatment tank 41 regularly every day, and discharging the pretreated kitchen waste into a fermentation tank 40 regularly through a feeding port; discharging excess sludge generated by the AAO system 20 after the AAO system is stabilized, wherein the total amount of sludge in the fermentation tank 40 is not more than one third of the volume of the fermentation tank; controlling the sludge age in the fermentation tank 40 to be 7-10d, the fermentation temperature to be 25-35 ℃, and the rotating speed of the stirrer 83 to be 80 r/min; the mark of successful starting of the fermentation tank 40 is that the grain size of the pretreated kitchen waste particles is less than 5 mm; the concentration of SCOD (soluble organic matter) and SCFAs (volatile fatty acid) in the residual sludge fermentation liquor is kept stable, and the self-digestion rate of the residual sludge in the fermentation tank 40 is more than 0.3 kgTSS/d; the concentration fluctuation range of SCOD and SCFAs is within 200mg/L, which is considered as stable.
S3, running the AAO system 20 and fermentor 40 in series: sludge is periodically conveyed into the fermentation tank 40 through a sludge drainage system 53, secondary effluent in the secondary sedimentation tank 30 is conveyed into the fermentation tank 40 according to a preset proportion, and fermentation mixed liquor in the fermentation tank 40 is periodically conveyed to the AAO system 20 through a fermentation mixed liquor backflow system 51.
Specifically, the excess sludge generated by the AAO system 20 is periodically discharged into the fermentation tank 40 for anaerobic hydrolytic acidification of the excess sludge; according to living habits of local villagers, collecting domestic sewage and kitchen waste generated by the villagers regularly, introducing the domestic sewage into a water storage tank 10 for adjusting water quality and water quantity, pouring the kitchen waste into a kitchen waste pretreatment tank 41 for pretreatment, and then performing anaerobic fermentation in combination with residual sludge; the secondary effluent after the domestic sewage treatment enters a fermentation tank 40 according to a certain proportion to be mixed with kitchen waste and excess sludge fermentation liquor, the fermentation mixed liquor periodically flows back to an anaerobic tank 21 of the AAO system 20 through a fermentation mixed liquor backflow system 51, and the nitrogen and phosphorus removal performance of the fermentation mixed liquor is enhanced through rich ideal carbon sources in the fermentation mixed liquor; wherein, the fermentation mixed liquor meets the following conditions: C/N is more than or equal to 5, C/P is more than or equal to 30, TN is less than 60mg/L, and TP is less than 10 mg/L.
Compared with the prior art, the treatment method of the kitchen waste and excess sludge combined co-fermentation integrated village and town sewage treatment device has the following advantages:
1. the device for treating the rural domestic sewage by combining the kitchen waste realizes the simultaneous removal of the domestic sewage and the kitchen waste in the village and town, provides a novel way for the harmlessness, reduction and reclamation of the rural domestic sewage and the kitchen waste, and further obtains greater economic benefit;
2. rich organic components in the kitchen waste are converted into an ideal carbon source required by a biological sewage treatment process through a way of co-fermentation with excess sludge, and the pollutant removal performance of biological sewage treatment equipment can be realized by recycling the ideal carbon source, so that the quality of effluent is ensured to be stable and reach the standard;
3. by optimally combining the characteristics of the AAO system treatment process (biological nitrogen and phosphorus removal process) and the fermentation tank treatment process (sludge anaerobic fermentation process), the efficient intensive treatment of rural sewage with less land occupation is realized.
In a particular embodiment of the present invention,
the effective volume of the kitchen waste and excess sludge co-fermentation integrated village and town sewage treatment device is 18.3m3Wherein the water storage tank is 5m3AAO System 6.3m3(the volume of the anaerobic tank: the volume of the anoxic tank: the volume of the aerobic tank: 1:2:4), and the volume of the secondary sedimentation tank is 2m35m in the fermentation tank3Kitchen waste pretreatment tank 1m3And the device is made by welding stainless steel plates with the thickness of 10 mm.
The specific water quality of the influent during the test is as follows:
the specific operation is as follows:
1) inoculating return sludge of the urban sewage treatment plant into an AAO system, keeping the sludge concentration in an anaerobic tank 21, an anoxic tank 22 and an aerobic tank 23 at 3500-; then the stirrer 81, the stirrer 82 and the air compressor 60 are started to respectively control the reflux ratio of the nitrifying liquid and the reflux ratio of the excess sludge to 300 percent and 100 percentLeft and right; the volume of the anaerobic tank 21, the volume of the anoxic tank 22 and the volume of the aerobic tank 23 are 1:2:4, and the flow of inlet water is controlled to be 0.5 +/-0.1 m3The hydraulic retention time of the AAO system is controlled to be 11-16 h; the concentration of the dissolved oxygen in the aerobic tank 23 is always controlled to be 1.5-2.5mg/L through a rotor flow meter; controlling the discharge amount of the residual sludge to be 0.4 +/-0.1 m3And d, controlling the sludge age of the AAO system to be 20-30 d.
2) Inoculating 1-2m3The municipal sewage treatment plant concentrates the sludge in the fermentation tank 40, keeps the sludge concentration therein at 10000-; after the AAO system is stabilized, discharging the residual sludge generated by the AAO system into the fermentation tank 40 periodically, wherein the total amount of the sludge in the fermentation tank 40 is not more than one third of the volume of the sludge; controlling the sludge age of the fermentation tank to be 7-10d, the fermentation temperature to be 25-35 ℃, and the rotating speed of the stirrer 83 to be 80 r/min; kitchen waste (300kg/d) of nearby residents is periodically collected and pretreated in a kitchen waste pretreatment tank 41, stirred for 2 hours and then discharged into a fermentation tank 40 for anaerobic fermentation.
3) The second-stage effluent after the domestic sewage treatment by the AAO system passes through a second-stage effluent drainage system 52 at a certain flow rate (3 m)3D) flowing into the fermentation tank 40 to be mixed with fermentation liquor of the kitchen waste and the residual sludge, and discharging the rest secondary effluent from the water outlet 31 under the action of water level potential energy; when the liquid level in the fermentation tank 40 is higher than the designated height, the fermentation mixed liquid reflux system 51 is controlled by the liquid level meter to be opened, the fermentation mixed liquid is introduced into the anaerobic tank 21 to provide an ideal carbon source for the AAO system, and the flow of the fermentation mixed liquid is controlled to be 0.1 +/-0.05 m3H; after the kitchen waste and the residual sludge fermentation liquor are mixed and diluted with secondary effluent, C/N of the fermentation mixed liquor is 9-11, C/P is 37-42, TN is 45.6-57.8mg/L, and TP is 6.0-9.7 mg/L.
The test result shows that: after the system operates stably for 120 days, the COD of the effluent of the AAO system is 38.2-45.4mg/L, NH4+-N-0.1-0.7 mg/L, TN-7.1-10.6 mg/L, TP-0.1-0.6 mg/L; the acid yield of the fermentation tank 40 is 700-800mgSCOD/L, and the self-digestion rate of the excess sludge is 0.31kg TSS/d. All the above parameters meet the emission requirements.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The utility model provides a rural domestic sewage treatment's of kitchen garbage combination device which characterized in that includes: a water storage tank (10), an AAO system (20), a secondary sedimentation tank (30), a fermentation tank (40), a fermentation mixed liquid reflux system (51), a secondary effluent drainage system (52) and a sludge drainage system (53),
the reservoir (10) is in communication with the AAO system (20), the AAO system (20) being in communication with the secondary sedimentation tank (30); the secondary sedimentation tank (30) is provided with a water outlet (31) for discharging secondary effluent in the secondary sedimentation tank (30); the fermentation tank (40) is internally provided with a kitchen waste pretreatment tank (41) for pretreating kitchen waste and releasing the pretreated kitchen waste into fermentation mixed liquid in the fermentation tank (40) for fermentation;
the secondary effluent drainage system (52) is used for conveying secondary effluent in the secondary sedimentation tank (30) to the fermentation tank (40), the sludge drainage system (53) is used for conveying residual sludge in the secondary sedimentation tank (30) to the fermentation tank (40) and the AAO system (20), and the fermentation mixed liquid backflow system (51) is used for returning fermentation mixed liquid in the fermentation tank (40) to the AAO system (20).
2. The kitchen waste rural domestic sewage treatment device according to claim 1, wherein the AAO system (20) comprises an anaerobic tank (21), an anoxic tank (22) and an aerobic tank (23) which are communicated in sequence, the water storage tank (10) is communicated with the anaerobic tank (21), an air-lift type return pipe (231) is arranged between the aerobic tank (23) and the anoxic tank (22), and the air-lift type return pipe (231) is used for returning nitrified liquid in the aerobic tank (23) to the anoxic tank (22);
the liquid inlet of the fermentation mixed liquid reflux system (51) is communicated with the fermentation tank (40), and the liquid outlet of the fermentation mixed liquid reflux system (51) is communicated with the anaerobic tank (21).
3. The kitchen waste rural domestic sewage treatment plant according to claim 2, wherein said sludge drainage system (53) has a sludge inlet and two sludge outlets, said sludge inlet is connected to said secondary sedimentation tank (30), and said two sludge outlets are connected to said fermentation tank (40) and said anaerobic tank (21), respectively.
4. The device for treating rural domestic sewage by combining kitchen waste according to claim 2, wherein the device for treating rural domestic sewage by combining kitchen waste further comprises: the aeration device comprises an air compressor (60) and an aeration head (61) communicated with the air compressor (60), wherein the aeration head (61) is arranged at the bottom of the aerobic tank (23).
5. The kitchen waste rural domestic sewage treatment unit according to claim 4, wherein a stainless steel heating air pipe (42) is arranged in the fermentation tank (40), and the stainless steel heating air pipe (42) is communicated with the air compressor (60).
6. The device for treating rural domestic sewage by combining kitchen waste according to claim 4, wherein the device for treating rural domestic sewage by combining kitchen waste further comprises: a PLC autonomous system (70);
the PLC automatic control system (70) is electrically connected with the fermentation mixed liquid reflux system (51) to control the reflux quantity and the reflux time period of the fermentation mixed liquid reflux system (51);
the PLC automatic control system (70) is electrically connected with the secondary effluent drainage system (52) so as to control the drainage quantity and the drainage time period of the secondary effluent drainage system (52);
the PLC automatic control system (70) is electrically connected with the sludge drainage system (53) to control the drainage quantity and the drainage time period of the sludge drainage system (53);
the PLC automatic control system (70) is electrically connected with the air compressor (60) so as to control the air supply quantity of the PLC automatic control system (70).
7. The device for treating the rural domestic sewage by combining the kitchen waste according to claim 2, wherein stirrers are arranged in the anaerobic tank (21), the anoxic tank (22) and the fermentation tank (40).
8. The kitchen waste rural domestic sewage treatment combined device according to claim 2, wherein a draft tube (32) is arranged in the secondary sedimentation tank (30), and the aerobic tank (23) is communicated with the secondary sedimentation tank (30) through the draft tube (32).
9. The kitchen waste rural domestic sewage treatment device according to claim 2, wherein the communication port of the water storage tank (10) and the anaerobic tank (21) is arranged at the upper part of the water storage tank (10), the communication port of the anaerobic tank (21) and the anoxic tank (22) is arranged at the lower part of the anaerobic tank (21), and the communication port of the anoxic tank (22) and the aerobic tank (23) is arranged at the upper part of the anoxic tank (22).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920267699.6U CN209890347U (en) | 2019-03-04 | 2019-03-04 | Rural domestic sewage treatment's of kitchen garbage combination device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920267699.6U CN209890347U (en) | 2019-03-04 | 2019-03-04 | Rural domestic sewage treatment's of kitchen garbage combination device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109942084A (en) * | 2019-03-04 | 2019-06-28 | 西安建筑科技大学 | A kind of device and method of kitchen garbage joint rural domestic sewage treatment |
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2019
- 2019-03-04 CN CN201920267699.6U patent/CN209890347U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109942084A (en) * | 2019-03-04 | 2019-06-28 | 西安建筑科技大学 | A kind of device and method of kitchen garbage joint rural domestic sewage treatment |
| CN109942084B (en) * | 2019-03-04 | 2023-10-20 | 西安建筑科技大学 | Kitchen waste combined rural domestic sewage treatment device and method |
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