CN109942084B - Kitchen waste combined rural domestic sewage treatment device and method - Google Patents
Kitchen waste combined rural domestic sewage treatment device and method Download PDFInfo
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- CN109942084B CN109942084B CN201910158902.0A CN201910158902A CN109942084B CN 109942084 B CN109942084 B CN 109942084B CN 201910158902 A CN201910158902 A CN 201910158902A CN 109942084 B CN109942084 B CN 109942084B
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Abstract
The invention provides a kitchen waste combined rural domestic sewage treatment device and a kitchen waste combined rural domestic sewage treatment method, wherein the device comprises the following components: the device comprises a water storage tank, an AAO system, a secondary sedimentation tank, a fermentation mixed liquor backflow system, a secondary effluent drainage system and a sludge drainage system, wherein 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 kitchen waste pretreatment tank is arranged in the fermentation tank and is used for pretreating kitchen waste and releasing the pretreated kitchen waste into the 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 village and town areas are removed at the same time, and a novel approach is provided for harmless, reduction and recycling of the domestic sewage and the kitchen waste in villages and towns.
Description
Technical Field
The invention relates to the technical field of village and town sewage treatment, in particular to a kitchen waste combined rural domestic sewage treatment device and method, which are mainly suitable for decentralized rural sewage treatment and medium and small town sewage treatment.
Background
At present, the method for treating the sewage in villages and towns in China still takes a combined technology of physical and chemical combined biological treatment as a main component, and the quality of the effluent is difficult to reach the standard under the condition that the carbon source of the inlet water is difficult to ensure by the biological sewage treatment technology. Kitchen waste is an important component of village and town waste, and the great yield of the kitchen waste has hindered the development of villages and towns, and the traditional disposal mode cannot meet the increasingly strict environmental standards. However, the kitchen waste fermentation product contains rich organic components, so that the carbon source requirement in the biological sewage treatment process can be met. Therefore, the carbon source is supplied by utilizing the kitchen waste fermentation product, so that the reasonable treatment of the solid waste is facilitated, the pollutant removal performance of the biological sewage treatment system can be effectively improved, and the novel pollutant control mode combining the solid waste treatment and the sewage treatment is realized.
Disclosure of Invention
The invention aims to provide a device and a method for treating kitchen waste combined rural domestic sewage, which are used for solving the problems that the wastewater treatment of villages and towns and the kitchen waste treatment are difficult to reach standards in the prior art. The kitchen waste combined rural domestic sewage treatment device and method are mainly applied to the treatment of rural domestic sewage.
In order to achieve the above purpose, according to one aspect of the present invention, there is provided a kitchen waste combined rural domestic sewage treatment apparatus, comprising: a water storage tank, an AAO system, a secondary sedimentation tank, a fermentation mixed liquid reflux system, a secondary water outlet 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 which is used for pretreating kitchen waste and releasing the pretreated kitchen waste into fermentation mixed liquor 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 liquor reflux system is used for refluxing fermentation mixed liquor in the fermentation tank to the AAO system.
Optionally, the AAO system comprises an anaerobic tank, an anoxic tank and an aerobic tank which are sequentially communicated, the water storage tank is communicated with the anaerobic tank, and an air-lifting return pipe is arranged between the aerobic tank and the anoxic tank and used for returning 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 is provided with 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 kitchen waste combined rural domestic sewage treatment device further comprises: 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 kitchen waste combined rural domestic sewage treatment device further comprises: a PLC automatic control system;
the PLC automatic control system is electrically connected with the fermentation mixed liquid reflux system to control the reflux quantity and the reflux period of the fermentation mixed liquid reflux system;
the PLC automatic control system is electrically connected with the secondary water outlet drainage system to control the drainage quantity and drainage period of the secondary water outlet drainage system;
the PLC automatic control system is electrically connected with the sludge drainage system to control the drainage quantity and drainage period of the sludge drainage system;
the PLC automatic control system is electrically connected with the air compressor so as to control the air supply quantity of the PLC automatic control system.
Optionally, the anaerobic tank, the anoxic tank and the fermentation tank are all provided with stirrers.
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 invention further provides a treatment method of the kitchen waste combined rural domestic sewage treatment device, which comprises the following steps of:
s1, starting an AAO system: inoculating activated sludge into the AAO system, and controlling the concentration range of the activated sludge to 3500-4500mg/L; introducing domestic sewage into a water storage tank; adjusting parameters of the AAO system to enable the outlet water of the water outlet to reach the standard;
s2, starting the fermentation tank: inoculating anaerobic fermentation sludge into a fermentation tank, and controlling the concentration range of the activated sludge to 10000-20000mg/L; the kitchen waste is put into the kitchen waste pretreatment tank for pretreatment at regular intervals, and the pretreated kitchen waste is discharged into the fermentation tank for fermentation at regular intervals;
s3, operating the AAO system and the fermentation tank in series: and (3) periodically conveying sludge into the fermentation tank through a sludge drainage system, conveying secondary effluent in the secondary sedimentation tank into the fermentation tank according to a preset proportion, and periodically conveying fermentation mixed liquor in the fermentation tank to the AAO system through a fermentation mixed liquor reflux system.
By the technical scheme, domestic sewage treatment and kitchen waste treatment are combined, domestic sewage and kitchen waste in village and town areas are removed at the same time, a novel approach is provided for harmless, reduction and recycling of the domestic sewage and the kitchen waste in villages and towns, and larger economic benefits are further obtained; meanwhile, the efficient intensive treatment of rural sewage with less occupied area is realized by the optimized combination of fermentation and sewage treatment process characteristics.
Drawings
Fig. 1 is a schematic diagram of an apparatus for treating kitchen waste combined with rural domestic sewage in an embodiment of the present invention.
Reference numerals:
10: a water storage tank; 11-an inlet for domestic sewage; 12-a slag discharge port;
a 20-AAO system; 21-an anaerobic tank; 22-an anoxic tank; 23-an aerobic tank; 231-air-lift type 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 pipes; 43-excess sludge discharge port;
51-a fermentation mixed liquor reflux system; 52-a secondary effluent drainage system; 53-a sludge drainage system;
a 60-air compressor; 61-an aeration head;
70-PLC automatic control system;
81. 82, 83-agitators.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be understood that the depicted embodiments are some, but not all, embodiments of the present invention. The specific embodiments described herein are to be considered in an illustrative rather than a restrictive sense. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
Referring to fig. 1, this embodiment provides a kitchen waste combined rural domestic sewage treatment device, including: a water storage tank 10, an AAO (Anaerobic-Anoxic-Oxic) system 20, a secondary sedimentation tank 30, a fermentation tank 40, a fermentation mixed liquor reflux system 51, a secondary effluent drainage system 52 and a sludge drainage system 53; wherein the water storage tank 10 is communicated with the AAO system 20, and the AAO system 20 is communicated 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 provided with a kitchen waste pretreatment tank 41 for pretreating kitchen waste and releasing the pretreated kitchen waste into a fermentation mixed solution 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 into the fermentation tank 40, the sludge drainage system 53 is used for conveying residual sludge in the secondary sedimentation tank 30 into the fermentation tank 40, and the fermentation mixed liquor reflux system 51 is used for refluxing fermentation mixed liquor in the fermentation tank 40 into the AAO system 20. By the technical scheme, domestic sewage treatment and kitchen waste treatment are combined, domestic sewage and kitchen waste in village and town areas are removed at the same time, a novel approach is provided for harmless, reduction and recycling of the domestic sewage and the kitchen waste in villages and towns, and larger economic benefits are further obtained; realizing the efficient intensive treatment of rural sewage with less occupied area. The kitchen waste combined rural domestic sewage treatment device is mainly applied to the treatment of rural domestic sewage.
In the above scheme, the AAO system 20 is a device for sewage treatment process, can be used for secondary sewage treatment or tertiary sewage treatment, and has good denitrification and dephosphorization effects. The water storage tank 10 has 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 impurities in the water storage tank 10 can be discharged through the slag discharge port 12.
For the AAO system 20, the anaerobic tank 21, the anoxic tank 22 and the aerobic tank 23 are sequentially communicated, the water storage tank 10 is communicated with the anaerobic tank 21, a gas stripping type return pipe 231 is arranged between the aerobic tank 23 and the anoxic tank 22, the gas stripping 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 water flow holes staggered up and down, thereby ensuring the flow state; specifically: the water storage tank 10 is provided with a communication port with the anaerobic tank 21 at the upper part of the water storage tank 10, the anaerobic tank 21 is provided with a communication port with the anoxic tank 22 at the lower part of the anaerobic tank 21, and the anoxic tank 22 is provided with a communication port with the aerobic tank 23 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 fermenter 40 is also provided with a stirrer 83 for stirring the sludge in the fermenter 40, and stirring mainly plays a role in promoting decomposition of microorganisms.
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 also can be discharged into the anaerobic tank 21 according to the requirement, thereby improving the utilization rate of the sludge in the secondary sedimentation tank 30 and reducing the sludge discharge.
Further, the kitchen waste combined rural domestic sewage treatment device further 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. Air is continuously supplied into the aerobic tank 23 through an air compressor 60 and an aeration head 61 to increase the oxygen content in the aerobic tank 23.
Further, a stainless steel heating air pipe 42 is provided in the fermenter 40, and the stainless steel heating air pipe 42 communicates with the air compressor 60. The heat energy generated by the air compressor 60 is transferred to the fermenter 40 through the stainless steel heating air pipe 42, and the fermentation temperature in the fermenter 40 is ensured. Thus, the air compressor 60 can be used to both deliver air to the aerobic tank 23 and to heat the fermenter 40. The bottom of the fermenter 40 is further provided with a surplus sludge discharge port 43 for discharging surplus sludge.
In order to facilitate control of the fermentation mixed liquor reflux system 51, the secondary water drainage system 52, the sludge drainage system 53 and the air compressor 60, the kitchen waste combined rural domestic sewage treatment device is also provided with a PLC automatic control system 70; the control fermentation mixed liquor reflux system 51, the secondary water outlet drainage system 52, the sludge drainage system 53 and the air compressor 60 are all electrically connected with the PLC automatic control system 70, the PLC automatic control system 70 can control the reflux amount and the reflux period of the fermentation mixed liquor reflux system 51, the drainage amount and the drainage period of the secondary water outlet drainage system 52, the drainage amount and the drainage period of the sludge drainage system 53 and the air supply amount of the air compressor 60.
A flow guide pipe 32 is arranged in the secondary sedimentation tank 30, and the aerobic tank 23 is communicated with the secondary sedimentation tank 30 through the flow guide pipe 32.
Based on the introduction of the kitchen waste combined rural domestic sewage treatment device, the embodiment also provides a treatment method of the kitchen waste combined rural domestic sewage treatment device, which comprises the following steps:
s1, starting an AAO system 20: inoculating activated sludge into the AAO system 20, and controlling the concentration of the activated sludge to be 3500-4500mg/L; introducing domestic sewage into the water reservoir 10; adjusting each parameter of the AAO system 20 to enable the effluent of the water outlet 31 to reach the standard; wherein the activated sludge contains nitrogen and phosphorus removal microorganisms, for example: the method can be used for inoculating the return activated sludge of the municipal sewage treatment plant.
Specifically, inoculating the activated sludge returned by the municipal sewage treatment plant into the AAO system 20, keeping the sludge concentration range in the anaerobic tank 21, the anoxic tank 22 and the aerobic tank 23 at 3500-4500mg/L, and simultaneously introducing domestic sewage into the water storage tank 10; the process of adjusting the parameters of the AAO system 20 includes: starting the stirrer 81, the stirrer 82 and the air compressor 60 to control the reflux ratio of the nitrified liquid and the reflux ratio of the residual sludge to be about 300% and 100% respectively; the volume of the anaerobic tank 21 is equal to the volume of the anoxic tank 22, the volume of the aerobic tank 23 is equal to 1:2:4, and the hydraulic retention time of the AAO system 20 is controlled to be 11-16h by adjusting the inflow; the concentration of dissolved oxygen in the aerobic tank 23 is always controlled to be 1.5-2.5mg/L through a rotameter; the sludge age of the AAO system 20 was controlled to 20-30 days by adjusting the excess sludge discharge amount. The sign of successful start-up of AAO system 20 is that the COD of the system effluent is less than 50mg/L and NH4 + N is less than 5mg/L, TN is less than 15mg/L, TP is less than 1mg/L. Wherein COD represents chemical oxygen demand; NH4+ -N represents ammonia nitrogen amount; TN represents the total nitrogen content; TP represents the total phosphorus amount.
S2, starting the fermentation tank 40: inoculating anaerobic fermentation sludge into a fermentation tank 40, and controlling the concentration range of the activated sludge to 10000-20000mg/L; the anaerobic fermentation sludge can meet the anaerobic fermentation requirement, and can be inoculated with the concentrated sludge of the municipal sewage treatment plant; then, kitchen waste is periodically put into the kitchen waste pretreatment tank 41 for pretreatment, and the pretreated kitchen waste is periodically discharged into the fermentation tank 40 for fermentation;
specifically, inoculating concentrated sludge of an urban sewage treatment plant into the fermentation tank 40, keeping the sludge concentration in the fermentation tank to 10000-20000mg/L, and then starting the stirrer 83 to stir under anaerobic conditions; a certain amount of kitchen waste is periodically collected every day in a kitchen waste pretreatment tank 41, and the pretreated kitchen waste is periodically discharged into a fermentation tank 40 through a feeding port; after the AAO system 20 is stabilized, the surplus sludge generated by the AAO system is discharged into the fermentation tank 40, and the total amount of the sludge in the fermentation tank 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 regulating the rotating speed of the stirrer 83 to be 80r/min; the sign of successful start-up of the fermenter 40 is that the particle size of the pretreated kitchen waste particles is < 5mm; the concentration of SCOD (soluble organic matter) and SCFAs (volatile fatty acids) in the excess sludge fermentation broth remains stable, and the self-digestion rate of the excess sludge in the fermentation tank 40 is more than 0.3kg TSS/d; fluctuations in SCOD and SCFAs concentrations within 200mg/L can be considered stable.
S3, operating the AAO system 20 and the fermentation tank 40 in series: the sludge is periodically conveyed to the fermentation tank 40 by a sludge drainage system 53, the secondary effluent in the secondary sedimentation tank 30 is conveyed to the fermentation tank 40 according to a predetermined proportion, and the fermentation mixed liquor in the fermentation tank 40 is periodically conveyed to the AAO system 20 by a fermentation mixed liquor reflux system 51.
Specifically, the surplus sludge produced by the AAO system 20 is kept to be periodically discharged into the fermentation tank 40 for anaerobic hydrolysis acidification of the surplus sludge; according to living habits of local villagers, the living sewage and kitchen waste generated by the villagers are collected periodically, the living sewage is introduced into the water storage tank 10 for adjusting water quality and water quantity, the kitchen waste is poured into the kitchen waste pretreatment tank 41 for pretreatment, and then anaerobic fermentation is carried out in combination with residual sludge; the secondary effluent after domestic sewage treatment enters the fermentation tank 40 according to a certain proportion and is mixed with kitchen waste and residual sludge fermentation liquor, the fermentation mixed liquor is periodically refluxed to the anaerobic tank 21 of the AAO system 20 through the fermentation mixed liquor reflux system 51, and the denitrification and dephosphorization 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, TP is less than 10mg/L.
The treatment method of the kitchen waste combined with residual sludge co-fermentation integrated village and town sewage treatment device has the following advantages compared with the prior art:
1. the kitchen waste is combined with rural domestic sewage treatment device, so that domestic sewage and kitchen waste in village and town areas are removed at the same time, a novel approach is provided for harmless, reduction and recycling of the domestic sewage and kitchen waste in villages and towns, and larger economic benefits are further obtained;
2. the rich organic components in the kitchen waste are converted into ideal carbon sources required by a biological sewage treatment process through a way of co-fermentation with the residual sludge, and the pollutant removal performance of biological sewage treatment equipment can be realized by recycling the ideal carbon sources, so that the quality of effluent is ensured to reach the standard stably;
3. by optimally combining the characteristics of an AAO system treatment process (biological denitrification and dephosphorization process) and a fermentation tank treatment process (sludge anaerobic fermentation process), the rural sewage small-occupation efficient intensive treatment is realized.
In one specific embodiment of the present invention,
the effective volume of the kitchen waste combined with residual sludge co-fermentation village and town sewage treatment device is 18.3m 3 Wherein the water storage tank 5m 3 AAO System 6.3m 3 (anaerobic tank volume: anoxic tank volume: aerobic tank volume=1:2:4), secondary sedimentation tank 2m 3 Fermentation tank 5m 3 Kitchen waste pretreatment tank 1m 3 The device was made of stainless steel plates 10mm thick by welding.
The specific water quality of the water fed during the test is shown in the following table:
the specific operation is as follows:
1) Inoculating the reflux sludge of the urban sewage treatment plant into an AAO system, keeping the sludge concentration in the anaerobic tank 21, the anoxic tank 22 and the aerobic tank 23 to 3500-4500mg/L, and simultaneously introducing the village domestic sewage into the water storage tank 10 every day to regulate the water quality and the water quantity; subsequently, the stirrer 81, the stirrer 82 and the air compressor 60 are started, and the reflux ratio of the nitrified liquid and the reflux ratio of the residual sludge are controlled to be about 300% and 100%, respectively; the volume of the anaerobic tank 21, the volume of the anoxic tank 22 and the volume of the aerobic tank 23 are respectively 1:2:4, and the inflow water flow is controlled to be 0.5+/-0.1 m 3 Controlling the hydraulic retention time of the AAO system to be 11-16h; dissolved oxygen in the aerobic tank 23The concentration is always controlled to be 1.5-2.5mg/L through a rotameter; controlling the discharge amount of the excess sludge to be 0.4+/-0.1 m 3 And/d, controlling the sludge age of the AAO system to be 20-30d.
2) Inoculating 1-2m 3 Concentrated sludge of the municipal sewage treatment plant is placed in a fermentation tank 40, the concentration of the sludge in the fermentation tank is kept to 10000-20000mg/L, and then a stirrer 83 is started to stir under anaerobic conditions; after the AAO system is stabilized, the generated surplus sludge is also discharged into the fermentation tank 40 periodically, and 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 7-10d, the fermentation temperature to 25-35 ℃ and the rotating speed of the stirrer 83 to 80r/min; kitchen waste (300 kg/d) of nearby residents is periodically collected and pretreated in a kitchen waste pretreatment tank 41, and after stirring for 2 hours, the kitchen waste is discharged into a fermentation tank 40 for anaerobic fermentation.
3) The secondary effluent after the treatment of domestic sewage by the AAO system is led to flow (3 m) at a certain flow rate through the secondary effluent drainage system 52 3 And/d) flowing into the fermentation tank 40 to be mixed with fermentation liquor of kitchen waste and residual sludge, and the residual secondary effluent is completely discharged 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 reflux system 51 of the fermentation mixed liquid is controlled to be opened by a liquid level meter, the fermentation mixed liquid is introduced into the anaerobic tank 21 to provide an ideal carbon source for the AAO system, and the flow rate of the fermentation mixed liquid is controlled to be 0.1+/-0.05 m 3 /h; after the kitchen waste and the residual sludge fermentation liquor are mixed and diluted with secondary effluent, the fermentation mixed liquor has C/N=9-11, C/P=37-42, TN=45.6-57.8 mg/L and TP=6.0-9.7 mg/L.
The test results show that: after the system stably operates for 120 days, the effluent COD=38.2-45.4 mg/L and NH4 of the AAO system + -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 residual sludge is 0.31kg TSS/d. The above parameters all meet emission requirements.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a kitchen garbage unites rural domestic sewage treatment's 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 liquor reflux system (51), a secondary water outlet drainage system (52) and a sludge drainage system (53),
the water storage tank (10) is communicated with the AAO system (20), and the AAO system (20) is communicated 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 kitchen waste pretreatment tank (41) is arranged in the fermentation tank (40) and is used for pretreating kitchen waste and releasing the pretreated kitchen waste into fermentation mixed liquor 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) into the fermentation tank (40), the sludge drainage system (53) is used for conveying residual sludge in the secondary sedimentation tank (30) into the fermentation tank (40) and the AAO system (20), and the fermentation mixed liquor reflux system (51) is used for refluxing fermentation mixed liquor in the fermentation tank (40) into the AAO system (20);
the AAO system (20) 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), a gas stripping type return pipe (231) is arranged between the aerobic tank (23) and the anoxic tank (22), and the gas stripping 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).
2. The device for treating rural domestic sewage by combining kitchen waste according to claim 1, wherein the sludge drainage system (53) is provided with 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).
3. The apparatus for treating kitchen waste combined rural domestic sewage according to claim 1, wherein the apparatus for treating kitchen waste combined rural domestic sewage further 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).
4. A kitchen waste combined rural domestic sewage treatment device according to claim 3, 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).
5. A kitchen waste combined rural domestic sewage treatment apparatus according to claim 3, wherein the kitchen waste combined rural domestic sewage treatment apparatus further comprises: a PLC automatic control system (70);
the PLC automatic control system (70) is electrically connected with the fermentation mixed liquor backflow system (51) so as to control the backflow amount and the backflow period of the fermentation mixed liquor backflow system (51);
the PLC automatic control system (70) is electrically connected with the secondary water outlet drainage system (52) so as to control the drainage quantity and drainage period of the secondary water outlet drainage system (52);
the PLC (70) is electrically connected with the sludge drainage system (53) to control the drainage amount and drainage period of the sludge drainage system (53);
the PLC (70) is electrically connected with the air compressor (60) to control the air supply amount of the PLC (70).
6. The kitchen waste combined rural domestic sewage treatment apparatus according to claim 1, wherein the anaerobic tank (21), the anoxic tank (22) and the fermentation tank (40) are provided with stirrers.
7. The kitchen waste combined rural domestic sewage treatment device according to claim 1, wherein a flow guide pipe (32) is arranged in the secondary sedimentation tank (30), and the aerobic tank (23) is communicated with the secondary sedimentation tank (30) through the flow guide pipe (32).
8. The kitchen waste combined rural domestic sewage treatment device according to claim 1, wherein a 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), a communication port of the anaerobic tank (21) and the anoxic tank (22) is arranged at the lower part of the anaerobic tank (21), and a communication port of the anoxic tank (22) and the aerobic tank (23) is arranged at the upper part of the anoxic tank (22).
9. A method for treating a kitchen waste combined rural domestic sewage treatment apparatus according to any one of claims 1 to 8, comprising the steps of:
s1, starting an AAO system (20): inoculating activated sludge into the AAO system (20), and controlling the concentration range of the activated sludge to 3500-4500mg/L; introducing domestic sewage into the water storage tank (10); adjusting parameters of the AAO system (20) to enable the effluent of the water outlet (31) to reach the standard;
s2, starting the fermentation tank (40): inoculating anaerobic fermentation sludge into a fermentation tank (40), and controlling the concentration range of the anaerobic fermentation sludge to 10000-20000mg/L; stirring anaerobic fermentation sludge under anaerobic conditions; the kitchen waste is periodically put into the kitchen waste pretreatment tank (41) for pretreatment, and the pretreated kitchen waste is periodically discharged into the fermentation tank (40) for fermentation;
s3, operating the AAO system (20) and the fermentation tank (40) in series: the 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 into the AAO system (20) through a fermentation mixed liquor reflux system (51).
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| CN110642654B (en) * | 2019-11-19 | 2021-03-02 | 重庆大学 | Urban kitchen waste anaerobic fermentation biogas residue aerobic composting stirring system |
| CN112174314A (en) * | 2020-10-19 | 2021-01-05 | 国投信开水环境投资有限公司 | Ecological comprehensive system based on sinking type regeneration water plant and construction method |
| CN112573781A (en) * | 2020-12-29 | 2021-03-30 | 湖北君集水处理有限公司 | Synergistic treatment system and treatment method for performing nitrogen and phosphorus removal on low C/N sewage by using kitchen waste hydrolysis acidification liquid |
| CN114455783A (en) * | 2022-03-04 | 2022-05-10 | 中国电建集团西北勘测设计研究院有限公司 | Sewage sludge co-treatment system and method in low-temperature environment |
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| CN102718315A (en) * | 2012-06-01 | 2012-10-10 | 天津大学 | Method for hydrolyzing and acidifying residual sludge and organic wastes and supplementing carbon sources to promote biological nitrogen removal and application thereof |
| CN103833133A (en) * | 2014-03-06 | 2014-06-04 | 清华大学 | Method for treating domestic wastewater based on kitchen waste hydrolytic acidizing fluid |
| CN104388479A (en) * | 2014-11-21 | 2015-03-04 | 哈尔滨工业大学 | Method for producing short chain fatty acid by strengthening anaerobic fermentation of kitchen garbage |
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