Waste liquid treatment system and waste liquid treatment method

Abstract

The application discloses a waste liquid treatment system and a waste liquid treatment method based on the waste liquid treatment system. The waste liquid treatment system comprises a first system and a second system. The first system comprises a first subsystem and a second subsystem. The first subsystem is used for pre-deposition and deodorization of landfill leachate. The second subsystem comprises a first decarburization module. The second system comprises a third subsystem and a fourth subsystem. The third subsystem is suitable for pre-deposition and deodorization of kitchen biogas slurry. The fourth subsystem comprises a second decarburization module. The first decarburization module and the second decarburization module are connected to realize carbon-nitrogen ratio adjustment of any one of the first decarburization module and the second decarburization module through liquid intercommunication between the first decarburization module and the second decarburization module. The waste liquid treatment system has the advantages of high treatment efficiency of kitchen biogas slurry and high stability of continuous work.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste treatment equipment, in particular to a waste liquid treatment system and a waste liquid treatment method based on the waste liquid treatment system. BACKGROUND

[0002] Kitchen biogas liquid is the digestion liquid after anaerobic fermentation solid-liquid separation of kitchen waste, the water quality composition of kitchen biogas liquid is complex, the concentration of organic pollutants is high, the nutrition ratio is out of balance, the biochemical property is unstable, and the oil content in the biogas liquid is high, the efficiency of the waste liquid treatment system in the related art is low when treating the kitchen biogas liquid, and the operation cost is high. SUMMARY

[0003] The present application is made based on the discovery and realization of the inventors on the following facts and problems:

[0004] The kitchen biogas liquid treatment system in the related art generally adopts the combination process of the biological treatment method of "pretreatment system + membrane bioreactor MBR system + membrane deep treatment system" and membrane method, and problems such as slow biochemical start, large carbon source addition amount, and the influence of oil removal rate of pretreatment on membrane system blockage exist in the actual operation process.

[0005] The present application aims to at least solve one of the technical problems in the related art to some extent. To this end, the embodiments of the present application propose a waste liquid treatment system, which has the advantages of high treatment efficiency of kitchen biogas liquid and high stability of continuous work.

[0006] The waste liquid treatment system of the embodiments of the present application comprises a first system, the first system comprises a first subsystem and a second subsystem, the first subsystem is used for pre-deposition and deodorization of landfill leachate, and the second subsystem comprises a first decarburization module, the first decarburization module is used for decarburization treatment of landfill leachate discharged by the first subsystem; a second system, the second system comprises a third subsystem and a fourth subsystem, the third subsystem is adapted to pre-deposition and deodorization of kitchen biogas liquid, and the fourth subsystem comprises a second decarburization module, the second decarburization module is used for decarburization treatment of kitchen biogas liquid discharged by the third subsystem, and the first decarburization module and the second decarburization module are connected to realize carbon-nitrogen ratio adjustment of any one of the first decarburization module and the second decarburization module through liquid intercommunication between the first decarburization module and the second decarburization module.

[0007] The waste liquid treatment system of the embodiments of the present application has the advantages of high treatment efficiency of kitchen biogas liquid and high stability of continuous work.

[0008] In some embodiments, the second subsystem comprises a first denitrification module and a first filtration module, the first denitrification module is connected downstream of the first decarburization module, and the first filtration module is connected downstream of the first denitrification module.

[0009] and / or, the fourth subsystem comprises a second denitrification module connected downstream of the second decarburization module and a second filtration module connected downstream of the second denitrification module.

[0010] In some embodiments, the first decarburization module comprises a first anoxic tank disposed downstream of the first subsystem, the second decarburization module comprises a second anoxic tank disposed downstream of the third subsystem, and the first anoxic tank and the second anoxic tank are in fluid communication to enable liquid communication between the first decarburization module and the second decarburization module.

[0011] In some embodiments, the first denitrification module and the second filtration module are in fluid communication to enable liquid in the first denitrification module to be discharged to the second filtration module and to enable adjustment of the carbon-to-nitrogen ratio of the liquid discharged from the second filtration module.

[0012] In some embodiments, the first denitrification module comprises a first denitrification tank connected downstream of the first decarburization module and a first nitrification tank disposed downstream of the first denitrification tank, and the first nitrification tank is in fluid communication with the second filtration module to enable liquid in the first nitrification tank to be discharged to the second filtration module.

[0013] The second denitrification module comprises a second denitrification tank connected downstream of the second decarburization module and a second nitrification tank disposed downstream of the second denitrification tank, and the second nitrification tank is in fluid communication with the first filtration module to enable liquid in the second nitrification tank to be discharged to the first filtration module.

[0014] In some embodiments, the first filtration module is in fluid communication with the second anoxic tank to enable liquid in the first filtration module to be discharged to the second anoxic tank, and the second filtration module is in fluid communication with the first anoxic tank to enable liquid in the second filtration module to be discharged to the first anoxic tank.

[0015] In some embodiments, the first decarburization module further comprises a first aerobic tank connected between the first anoxic tank and the first denitrification module, and the second decarburization module further comprises a second aerobic tank connected between the second anoxic tank and the second denitrification module, and the first dewatering module is in fluid communication with the first subsystem and the first aerobic tank to enable dewatering of sludge generated in the first subsystem and the first aerobic tank, and the second dewatering module is in fluid communication with the second subsystem and the second aerobic tank to enable dewatering of sludge generated in the second subsystem and the second aerobic tank.

[0016] In some embodiments, the first dewatering module is connected to the second dewatering module so that the first dewatering module and the second dewatering module back up each other.

[0017] The waste liquid treatment method of the embodiments of the present application is based on the waste liquid treatment system of any of the above embodiments, and the waste liquid treatment method comprises the following steps:

[0018] The leachate discharged by the first subsystem is discharged into the fourth subsystem so that the carbon-nitrogen ratio of the waste liquid in the fourth subsystem is within the first set interval;

[0019] And / or, the waste liquid discharged by the second subsystem is discharged into the second filtration module so that the sludge concentration of the waste water in the second filtration module is within the second set interval;

[0020] And / or, the filtrate of the first filtration module is discharged into the fourth subsystem to increase the carbon-nitrogen ratio of the waste liquid in the fourth subsystem, and the filtrate of the second filtration module is discharged into the second subsystem to decrease the carbon-nitrogen ratio of the waste liquid in the second subsystem.

[0021] In some embodiments, discharging the leachate discharged by the first subsystem into the fourth subsystem comprises the following steps:

[0022] Detecting the organic pollutant content, ammonia-nitrogen pollutant content and total nitrogen content of the leachate discharged by the first subsystem, and detecting the organic pollutant content, ammonia-nitrogen pollutant content and total nitrogen content of the kitchen biogas liquid discharged by the third subsystem;

[0023] According to the organic pollutant content, ammonia-nitrogen pollutant content, total nitrogen content of the leachate discharged by the first subsystem, the organic pollutant content, ammonia-nitrogen pollutant content, total nitrogen content of the kitchen biogas liquid discharged by the third subsystem and the first set interval, the amount of the leachate discharged by the first subsystem into the fourth subsystem is obtained so that the carbon-nitrogen ratio of the waste liquid in the fourth subsystem is within the first set interval. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the waste liquid treatment system of the embodiments of the present application.

[0025] REFERENCE NUMERALS:

[0026] First system 1; first subsystem 11; basket filter 111; primary sedimentation tank 112; first adjusting tank 113; anaerobic tank 114; sedimentation tank 115; second subsystem 12; first decarbonization module 121; first anoxic tank 1211; first aerobic tank 1212; first denitrification module 122; first denitrification tank 1211; first nitrification tank 1212; first filtration module 1223;

[0027] The second system 2; the third subsystem 21; the biogas slurry pool 211; the air floatation system 212; the second adjusting pool 213; the fourth subsystem 22; the second decarburization module 221; the second anoxic pool 2211; the second aerobic pool 2212; the second denitrification module 222; the second denitrification pool 2221; the second nitrification pool 2222; the second filtration module 2223;

[0028] The first dewatering module 3; the first sludge pool 31; the first dewatering device 32;

[0029] The second dewatering module 4; the second sludge pool 41; the second dewatering device 42. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0031] The following describes the waste liquid treatment system according to the embodiments of the present application. Figure 1 The waste liquid treatment system according to the embodiments of the present application.

[0032] The waste liquid treatment system according to the embodiments of the present application comprises a first system 1 and a second system 2.

[0033] The first system 1 comprises a first subsystem 11 and a second subsystem 12, the first subsystem 11 is used for pre-deposition and deodorization of landfill leachate, and the second subsystem 12 comprises a first decarburization module 121, which is used for decarburization treatment of landfill leachate discharged by the first subsystem 11.

[0034] Specifically, the first subsystem 11 comprises a basket filter 111 and a primary sedimentation tank 112, the primary sedimentation tank 112 is arranged downstream of the basket filter 111, the basket filter 111 is used for filtering solid impurities in the landfill leachate, and the primary sedimentation tank 112 is used for separating impurities such as sludge in the landfill leachate from the liquid.

[0035] The first subsystem 11 further comprises a first adjusting pool, an anaerobic tank 114 and a sedimentation tank 115, the first adjusting pool 113, the anaerobic tank 114 and the sedimentation tank 115 are used for deodorization treatment of the landfill leachate separated in the primary sedimentation tank 112, so as to facilitate the second subsystem 12 to treat the landfill leachate.

[0036] The first decarburization module 121 comprises a first anoxic pool 1211 and a first aerobic pool 1212, through anoxic treatment and air floatation treatment of the landfill leachate, chemical reaction of organic matter in the landfill leachate occurs to produce precipitate, the organic matter in the landfill leachate is separated, and the effect of decarburization treatment of the landfill leachate is achieved.

[0037] The second system 2 comprises a third subsystem 21 and a fourth subsystem 22, the third subsystem 21 is suitable for pre-deposition and deodorization of the kitchen biogas slurry, the fourth subsystem 22 comprises a second decarburization module 221, the second decarburization module 221 is used for decarburization treatment of the kitchen biogas slurry discharged by the third subsystem 21, and the first decarburization module 121 and the second decarburization module 221 are connected to realize carbon-nitrogen ratio adjustment of any one of the first decarburization module 121 and the second decarburization module 221 through liquid intercommunication between the first decarburization module 121 and the second decarburization module 221.

[0038] Specifically, the third subsystem 21 comprises a biogas slurry pool 211, an air flotation system 212 and a second adjusting pool 213, the biogas slurry pool 211 is used for storing kitchen waste and performing anaerobic digestion treatment on the kitchen waste, so that solids in the kitchen biogas slurry are digested into liquid for convenient treatment, and the air flotation system 212 and the second adjusting pool 213 are used for deodorization treatment of the kitchen biogas slurry, so that the kitchen biogas slurry is further treated by the fourth subsystem 22.

[0039] The second decarburization module 221 comprises a second anoxic pool 2211 and a second aerobic pool 2212, through anoxic treatment and air flotation treatment of the kitchen biogas slurry, chemical reaction of organic matters in the kitchen biogas slurry is caused to produce precipitates, so that the organic matters in the kitchen biogas slurry are separated, and the effect of decarburization treatment of the kitchen biogas slurry is achieved.

[0040] The liquid discharge port of the second adjusting pool 213 is connected with the liquid inlet of the first adjusting pool 113, when the fourth subsystem 22 fails, waste liquid in the second adjusting pool 213 can be discharged into the first adjusting pool 113, and the waste liquid in the second adjusting pool 213 is treated by the first subsystem 11 and the second subsystem 12, so that the first system 1 serves as a backup of the second system 2.

[0041] The liquid inlet of the second decarburization module 221 is connected with the liquid inlet of the first decarburization module 121, when the first decarburization module 121 fails, waste liquid discharged by the first subsystem 11 can be discharged into the second decarburization module 221 in the fourth subsystem 22 for treatment, and when the second decarburization module 221 fails, waste liquid discharged by the third subsystem 21 can be discharged into the first decarburization module 121 in the second subsystem 12 for treatment.

[0042] The waste liquid treatment system of the embodiment of the present application connects the first system 1 for treating landfill leachate with the second system 2 for treating kitchen biogas slurry, on the one hand, the second subsystem 12 and the fourth subsystem 22 are backups of each other, when any one of the second subsystem 12 or the fourth subsystem 22 fails and cannot work, waste liquid originally required to be treated by the failed second subsystem 12 or the fourth subsystem 22 is introduced into the other one without failure for treatment, so that the waste liquid treatment system of the embodiment of the present application can continuously and stably work, and the waste liquid treatment system of the embodiment of the present application has the advantages of high stability and continuous work.

[0043] In another aspect, the second subsystem 12 and the fourth subsystem 22 are connected, so that the waste leachate discharged by the first subsystem 11 can flow into the fourth subsystem 22, and the waste leachate is used as a carbon source for adding to the kitchen biogas slurry, and is used as a raw material for treating the kitchen biogas slurry, thereby reducing the economic consumption of the waste liquid treatment system in the embodiment of the present application. The waste leachate and the kitchen biogas slurry are treated cooperatively, so that the oil content of the kitchen biogas slurry is diluted, the oil removal efficiency of the fourth subsystem 22 is improved, the risk of the fourth subsystem 22 being blocked is reduced or effectively avoided, and thus the efficiency of the fourth subsystem 22 for treating the kitchen biogas slurry is improved, so that the waste liquid treatment system in the embodiment of the present application has the advantage of high treatment efficiency for the kitchen biogas slurry.

[0044] In some embodiments, the second subsystem 12 comprises a first denitrification module 122 and a first filtration module 1223, the first denitrification module 122 is connected downstream of the first decarburization module 121, and the first filtration module 1223 is connected downstream of the first denitrification module 122.

[0045] And / or, the fourth subsystem 22 comprises a second denitrification module 222 and a second filtration module 2223, the second denitrification module 222 is connected downstream of the second decarburization module 221, and the second filtration module 2223 is connected downstream of the second denitrification module 222.

[0046] Specifically, the first denitrification module 122 comprises a first denitrification tank 1221 and a first nitrification tank 1222, the first nitrification tank 1222 is arranged downstream of the first denitrification tank 1221, the first denitrification tank 1221 is used for denitrification treatment of the waste liquid in the second subsystem 12, and the first nitrification tank 1222 is used for digestion treatment of the waste liquid in the second subsystem 12, so that the nitride in the waste liquid in the second subsystem 12 forms a precipitate, so as to facilitate the first filtration module 1223 to separate the nitrogen-containing compound in the waste liquid from the waste liquid to realize denitrification treatment of the waste liquid in the second subsystem 12.

[0047] The second denitrification module 222 comprises a second denitrification tank 2221 and a second nitrification tank 2222, the second nitrification tank 2222 is arranged downstream of the second denitrification tank 2221, the second denitrification tank 2221 is used for denitrification treatment of the waste liquid in the fourth subsystem 22, and the second nitrification tank 2222 is used for digestion treatment of the waste liquid in the fourth subsystem 22, so that the nitride in the waste liquid in the fourth subsystem 22 forms a precipitate, so as to facilitate the second filtration module 2223 to separate the nitrogen-containing compound in the waste liquid from the waste liquid to realize denitrification treatment of the waste liquid in the fourth subsystem 22.

[0048] In some embodiments, the first decarburization module 121 comprises a first anoxic tank 1211 arranged downstream of the first subsystem 11, and the second decarburization module 221 comprises a second anoxic tank 2211 arranged downstream of the third subsystem 21, and the first anoxic tank 1211 and the second anoxic tank 2211 are in communication with each other to realize liquid communication between the first decarburization module 121 and the second decarburization module 221.

[0049] Specifically, the first anoxic tank 1211 contains anaerobic bacteria, and when the waste liquid discharged by the first subsystem 11 enters the first anoxic tank 1211, the anaerobic bacteria in the first anoxic tank 1211 perform anaerobic respiration to consume the organic matter in the waste liquid in the first anoxic tank 1211, and the second anoxic tank 2211 contains anaerobic bacteria, and when the waste liquid discharged by the third subsystem 21 enters the second anoxic tank 2211, the anaerobic bacteria in the second anoxic tank 2211 perform anaerobic respiration to consume the organic matter in the waste liquid in the second anoxic tank 2211.

[0050] Thus, the first anoxic tank 1211 and the second anoxic tank 2211 are in communication, so that the waste liquid in the first anoxic tank 1211 and the waste liquid in the second anoxic tank 2211 can be communicated, on the one hand, the second subsystem 12 and the fourth subsystem 22 are backup to each other, when any one of the second subsystem 12 or the fourth subsystem 22 fails to work, the waste liquid originally required to be treated by the failed second subsystem 12 or the fourth subsystem 22 is diverted to the other one for treatment, on the other hand, the second subsystem 12 and the fourth subsystem 22 are connected, so that the leachate waste liquid discharged by the first subsystem 11 can flow into the fourth subsystem 22, and the leachate is used as a carbon source for adding to the kitchen biogas liquid, which is used as a raw material for treating the kitchen biogas liquid, thereby reducing the economic consumption of the waste liquid treatment system of the embodiment.

[0051] In some embodiments, the first denitrification module 122 and the second filtration module 2223 are connected so that the liquid in the first denitrification module 122 can be discharged to the second filtration module 2223 and the carbon-nitrogen ratio of the liquid discharged by the second filtration module 2223 is adjusted.

[0052] Specifically, the second filtration module 2223 is used to filter the waste liquid discharged by the second denitrification module 222, separate the sludge in the waste liquid, and discharge the separated waste liquid after nanofiltration treatment, and the first denitrification module 122 is connected to the second filtration module 2223 to discharge the treated leachate from the first denitrification module 122 into the second filtration module 2223 and mix with the treated kitchen biogas liquid from the second denitrification module 222 to the second filtration module 2223, and then perform ultrafiltration.

[0053] Thus, the first denitrification module 122 is connected with the second filtration module 2223, and the treated landfill leachate discharged from the first denitrification module 122 is discharged into the second filtration module 2223, mixed with the treated kitchen biogas liquid discharged from the second denitrification module 222 into the second filtration module 2223, and then subjected to ultrafiltration. The waste liquid discharged from the first denitrification module 122 can be mixed with the kitchen biogas liquid discharged from the second denitrification module 222 and then introduced into the second filtration module 2223, so that the sludge concentration in the second filtration module 2223 is increased to about 10 g / L, which is beneficial to improving the filtration efficiency of the second filtration module 2223 and effectively preventing the second filtration module 2223 from being blocked.

[0054] In some embodiments, the first denitrification module 122 comprises a first denitrification tank 1221 connected downstream of the first decarburization module 121 and a first nitrification tank 1222 arranged downstream of the first denitrification tank 1221, the first nitrification tank 1222 being connected with the second filtration module 2223 for discharging the waste liquid in the first nitrification tank 1222 into the second filtration module 2223.

[0055] The second denitrification module 222 comprises a second denitrification tank 2221 connected downstream of the second decarburization module 221 and a second nitrification tank 2222 arranged downstream of the second denitrification tank 2221, the second nitrification tank 2222 being connected with the first filtration module 1223 for discharging the waste liquid in the second nitrification tank 2222 into the first filtration module 1223.

[0056] Specifically, the first denitrification module 122 comprises a first denitrification tank 1221 and a first nitrification tank 1222, the first nitrification tank 1222 being arranged downstream of the first denitrification tank 1221, the first denitrification tank 1221 being used for denitrification treatment of the waste liquid in the second subsystem 12, and the first nitrification tank 1222 being used for digestion treatment of the waste liquid in the second subsystem 12, so that the nitrides in the waste liquid in the second subsystem 12 form precipitates, thereby facilitating the first filtration module 1223 to separate the nitrogen-containing compounds in the waste liquid from the waste liquid to achieve denitrification treatment of the waste liquid in the second subsystem 12.

[0057] The second denitrification module 222 comprises a second denitrification tank 2221 and a second nitrification tank 2222, the second nitrification tank 2222 being arranged downstream of the second denitrification tank 2221, the second denitrification tank 2221 being used for denitrification treatment of the waste liquid in the fourth subsystem 22, and the second nitrification tank 2222 being used for digestion treatment of the waste liquid in the fourth subsystem 22, so that the nitrides in the waste liquid in the fourth subsystem 22 form precipitates, thereby facilitating the second filtration module 2223 to separate the nitrogen-containing compounds in the waste liquid from the waste liquid to achieve denitrification treatment of the waste liquid in the fourth subsystem 22.

[0058] In some embodiments, the first filtration module 1223 is connected to the second anoxic tank 2211 to discharge the filtrate in the first filtration module 1223 into the second anoxic tank 2211, and the second filtration module 2223 is connected to the first anoxic tank 1211 to discharge the filtrate in the second filtration module 2223 into the first anoxic tank 1211.

[0059] Specifically, the first filtration module 1223 is used to filter the leachate of garbage after being treated by the first decarburization module 121 and the first denitrification module 122, separate the sludge in the waste liquid discharged from the first denitrification module 122 from the waste liquid, and the first filtration module 1223 is connected to the second anoxic tank 2211 to send the sludge filtered by the first filtration module 1223 into the second anoxic tank 2211; the second filtration module 2223 is used to filter the kitchen biogas liquid after being treated by the second decarburization module 221 and the second denitrification module 222, separate the sludge in the waste liquid discharged from the second denitrification module 222 from the waste liquid, and the second filtration module 2223 is connected to the first anoxic tank 1211 to send the sludge filtered by the second filtration module 2223 into the first anoxic tank 1211.

[0060] The first filtration module 1223 is connected to the second anoxic tank 2211, and the second filtration module 2223 is connected to the first anoxic tank 1211, the sludge produced in the second subsystem 12 is backflowed into the fourth subsystem 22, and the sludge produced in the fourth subsystem 22 is backflowed into the second subsystem 12, so as to adjust the biochemical characteristics such as COD content, ammonia nitrogen content and total nitrogen content of the waste liquid in the fourth subsystem 22 by the sludge in the first filtration module 1223, and adjust the biochemical characteristics such as COD content, ammonia nitrogen content and total nitrogen content of the waste liquid in the second subsystem 12 by the sludge in the second filtration module 2223.

[0061] Therefore, by adjusting the biochemical characteristics of the waste liquid in the fourth subsystem 22 by the sludge in the first filtration module 1223 and adjusting the biochemical characteristics of the waste liquid in the second subsystem 12 by the sludge in the second filtration module 2223, on the one hand, the nitrogen-carbon ratio of the waste liquid in the second subsystem 12 and the fourth subsystem 22 can be reasonably adjusted to 5-8, which is beneficial to improve the processing efficiency of the waste liquid treatment system of the embodiment of the present application on the garbage leachate and the kitchen biogas liquid, and on the other hand, the sludge discharged from the second subsystem 12 has a high carbon content, and sending the sludge filtered by the first filtration module 1223 into the fourth subsystem 22 can provide a carbon source for the fourth subsystem 22 to reduce the operation cost of the waste liquid treatment system of the embodiment of the present application.

[0062] In some embodiments, the first and second dewatering modules 3 and 4 are included, the first decarburization module 121 further comprises a first aerobic tank 1212 connected between the first anoxic tank 1211 and the first denitrification module 122, and the second decarburization module 221 further comprises a second aerobic tank 2212 connected between the second anoxic tank 2211 and the second denitrification module 222, the first dewatering module 3 is connected to the first subsystem 11 and the first aerobic tank 1212 to dewater sludge generated in the first subsystem 11 and the first aerobic tank 1212, and the second dewatering module 4 is connected to the second subsystem 12 and the second aerobic tank 2212 to dewater sludge generated in the second subsystem 12 and the second aerobic tank 2212.

[0063] Specifically, the first and second aerobic tanks 1212 and 2212 contain aerobic bacteria, the first aerobic tank 1212 is located downstream of the first anoxic tank 1211, and the waste liquid discharged from the first anoxic tank 1211 flows into the first aerobic tank 1212, and the aerobic bacteria in the first aerobic tank 1212 perform aerobic respiration to consume organic matter in the landfill leachate in the first aerobic tank 1212, thereby decarburizing the landfill leachate in the first aerobic tank 1212.

[0064] The second aerobic tank 2212 is located downstream of the second anoxic tank 2211, and the waste liquid discharged from the second anoxic tank 2211 flows into the second aerobic tank 2212, and the aerobic bacteria in the second aerobic tank 2212 perform aerobic respiration to consume organic matter in the kitchen biogas liquid in the second aerobic tank 2212, thereby decarburizing the kitchen biogas liquid in the second aerobic tank 2212.

[0065] The first dewatering module 3 includes a first sludge tank 31 and a first dewatering device 32, the first sludge tank 31 is connected to the first aerobic tank 1212, the anaerobic tank 114 and the sedimentation tank 115 in the first subsystem 11 to collect sludge discharged from the first aerobic tank 1212, the anaerobic tank 114 and the sedimentation tank 115 in the first subsystem 11, and to pretreat the sludge; the first dewatering device 32 is located downstream of the first sludge tank 31, and the first dewatering device 32 is used to dewater the sludge in the first sludge tank 31 and to incinerate the dewatered sludge.

[0066] The second dewatering module 4 includes a second sludge tank 41 and a second dewatering device 42, the second sludge tank 41 is connected to the air flotation system 212 and the second aerobic tank 2212 to collect sludge discharged from the air flotation system 212 and the second aerobic tank 2212, and to pretreat the sludge. The second dewatering device 42 is located downstream of the second sludge tank 41, and the second dewatering device 42 is used to dewater the sludge in the second sludge tank 41 and to incinerate the dewatered sludge.

[0067] In some embodiments, the first dewatering module 3 is connected to the second dewatering module 4 so that the first dewatering module 3 and the second dewatering module 4 back up each other.

[0068] Specifically, the first sludge tank 31 and the second sludge tank 41 are connected so that the sludge in the first sludge tank 31 can be discharged into the second sludge tank 41, and the sludge in the first sludge tank 31 is dewatered by using the second dewatering device 42, or the sludge in the second sludge tank 41 can be discharged into the first sludge tank 31, and the sludge in the second sludge tank 41 is dewatered by using the first dewatering device 32.

[0069] Therefore, when the first dewatering device 32 fails or has a low processing efficiency, the sludge in the first sludge tank 31 is processed by using the second dewatering device 42, which improves the working efficiency of the first dewatering module 3 and the second dewatering module 4 and avoids the influence of the dewatering efficiency of the first dewatering module 3 and the second dewatering module 4 on the working efficiency of the waste liquid treatment system of the embodiment of the present application.

[0070] The waste liquid treatment method of the embodiment of the present application is described below.

[0071] The waste liquid treatment method of the embodiment of the present application is based on the waste liquid treatment system of any of the above embodiments, and the waste liquid treatment method comprises the following steps:

[0072] The leachate discharged from the first subsystem 11 is discharged into the fourth subsystem 22 so that the carbon-nitrogen ratio of the waste liquid in the fourth subsystem 22 is within the first set interval; and / or the waste liquid discharged from the second subsystem 12 is discharged into the second filtration module 2223 so that the sludge concentration of the waste water in the second filtration module 2223 is within the second set interval; and / or the filtrate of the first filtration module 1223 is discharged into the fourth subsystem 22 to increase the carbon-nitrogen ratio of the waste liquid in the fourth subsystem 22, and the filtrate of the second filtration module 2223 is discharged into the second subsystem 12 to reduce the carbon-nitrogen ratio of the waste liquid in the second subsystem 12.

[0073] Specifically, the carbon content in the leachate is higher than that in the kitchen biogas, and the nitrogen content in the kitchen biogas is higher than that in the leachate. The leachate pretreated by the first subsystem 11 is discharged into the fourth subsystem 22 and mixed with the kitchen biogas in the fourth subsystem 22, which on the one hand makes the carbon-nitrogen ratio of the waste liquid in the fourth subsystem 22 be 5-8, and on the other hand adjusts the biochemical characteristics of the waste liquid in the fourth subsystem 22, improves the processing efficiency of the fourth subsystem 22, and reduces the oil content of the waste liquid in the fourth subsystem 22 after the two kinds of waste water are mixed and treated, thereby improving the oil removal efficiency of the fourth subsystem 22 and reducing the risk of blockage of the second filtration module 2223 during operation.

[0074] In some embodiments, the step of discharging the leachate from the first subsystem 11 into the fourth subsystem 22 comprises the following steps:

[0075] detecting the organic pollutant content, ammonia nitrogen pollutant content and total nitrogen content of the leachate discharged from the first subsystem 11 and the organic pollutant content, ammonia nitrogen pollutant content and total nitrogen content of the kitchen biogas slurry discharged from the third subsystem 21;

[0076] According to the organic pollutant content, ammonia nitrogen pollutant content, total nitrogen content of the leachate discharged from the first subsystem 11 and the organic pollutant content, ammonia nitrogen pollutant content, total nitrogen content of the kitchen biogas slurry discharged from the third subsystem 21 and the first set interval, the amount of the leachate discharged from the first subsystem 11 into the fourth subsystem 22 is obtained so that the carbon-nitrogen ratio of the waste liquid in the fourth subsystem 22 is within the first set interval.

[0077] Specifically, the waste liquid treatment system of the embodiment of the present application uses biochemical nitrogen removal to treat the organic matter and nitrogen compounds in the kitchen waste liquid and the leachate, and the processing efficiency of the waste liquid treatment system of the embodiment of the present application can be improved when the carbon-nitrogen ratio of the waste liquid is 5-8. By analyzing and detecting the leachate discharged from the first subsystem 11 and the kitchen biogas slurry discharged from the third subsystem 21, the COD content, ammonia nitrogen content and total nitrogen content of the leachate discharged from the first subsystem 11 and the kitchen biogas slurry discharged from the third subsystem 21 can be obtained respectively, and according to the optimal nitrogen-carbon ratio of 5-8, the amount of the waste liquid required to be discharged from the first subsystem 11 into the fourth subsystem 22 can be reversely calculated, so that the carbon-nitrogen ratio of the waste liquid in the fourth subsystem 22 is 5-8.

[0078] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0079] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0080] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", "unfixed", and the like are to be construed in a broad sense, for example, they can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection, or communication with each other; can be direct connection, or indirect connection via intermediate medium; can be internal communication of two elements, or interaction between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0082] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0083] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and the changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A waste liquid treatment system characterized by comprising: The system comprises: a first system comprising a first subsystem and a second subsystem, the first subsystem being configured to pre-deposit and deodorize landfill leachate, the second subsystem comprising a first decarburization module configured to decarburize the landfill leachate discharged from the first subsystem; a second system comprising a third subsystem and a fourth subsystem, the third subsystem being configured to pre-deposit and deodorize kitchen biogas slurry, the fourth subsystem comprising a second decarburization module configured to decarburize the kitchen biogas slurry discharged from the third subsystem, the first decarburization module and the second decarburization module being connected to each other to allow adjustment of the carbon-nitrogen ratio of the liquid discharged from either of the first decarburization module and the second decarburization module through liquid communication between the first decarburization module and the second decarburization module.

2. The waste fluid treatment system according to claim 1, wherein The second subsystem comprises a first denitrification module connected downstream of the first decarburization module and a first filtration module connected downstream of the first denitrification module. The fourth subsystem comprises a second denitrification module connected downstream of the second decarburization module and a second filtration module connected downstream of the second denitrification module.

3. The waste fluid treatment system according to claim 2, wherein The first decarburization module comprises a first anoxic tank disposed downstream of the first subsystem, and the second decarburization module comprises a second anoxic tank disposed downstream of the third subsystem, the first anoxic tank and the second anoxic tank being in communication with each other to allow liquid communication between the first decarburization module and the second decarburization module.

4. The waste fluid treatment system according to claim 3, wherein The first denitrification module and the second filtration module are connected to allow liquid in the first denitrification module to be discharged to the second filtration module and to allow adjustment of the carbon-nitrogen ratio of the liquid discharged from the second filtration module.

5. The waste fluid treatment system according to claim 4, wherein The first denitrification module comprises a first denitrification tank connected downstream of the first decarburization module and a first nitrification tank disposed downstream of the first denitrification tank, the first nitrification tank being connected to the second filtration module to allow waste liquid in the first nitrification tank to be discharged to the second filtration module. The second denitrification module comprises a second denitrification tank connected downstream of the second decarburization module and a second nitrification tank disposed downstream of the second denitrification tank, the second nitrification tank being connected to the first filtration module to allow waste liquid in the second nitrification tank to be discharged to the first filtration module.

6. The waste fluid treatment system according to claim 3, wherein The first filtration module is connected to the second anoxic tank to allow filtrate in the first filtration module to be discharged to the second anoxic tank, and the second filtration module is connected to the first anoxic tank to allow filtrate in the second filtration module to be discharged to the first anoxic tank.

7. The waste fluid treatment system according to claim 3, wherein The first dewatering module and the second dewatering module are connected to each other to serve as backup for each other.

8. The waste fluid treatment system according to claim 7, wherein The method comprises the following steps:

9. A waste liquid treatment method based on the waste liquid treatment system according to any one of claims 4 to 8, characterized by, The leachate discharged from the first subsystem is discharged into the fourth subsystem through the second subsystem, so that the carbon-nitrogen ratio of the waste liquid in the fourth subsystem is within the first set range; And / or, the waste liquid discharged from the second subsystem is discharged into the second filtration module, so that the sludge concentration of the waste water in the second filtration module is within the second set range; And / or, the filtrate of the first filtration module is discharged into the fourth subsystem to increase the carbon-nitrogen ratio of the waste liquid in the fourth subsystem, and the filtrate of the second filtration module is discharged into the second subsystem to decrease the carbon-nitrogen ratio of the waste liquid in the second subsystem. Discharging the leachate discharged from the first subsystem into the fourth subsystem comprises the following steps:

10. The waste liquid treatment method according to claim 9, wherein Detecting the organic pollutant content, ammonia-nitrogen pollutant content and total nitrogen content of the leachate discharged from the first subsystem, and detecting the organic pollutant content, ammonia-nitrogen pollutant content and total nitrogen content of the kitchen biogas liquid discharged from the third subsystem; According to the organic pollutant content, ammonia-nitrogen pollutant content, total nitrogen content of the leachate discharged from the first subsystem, the organic pollutant content, ammonia-nitrogen pollutant content, total nitrogen content of the kitchen biogas liquid discharged from the third subsystem and the first set range, the amount of the leachate discharged from the first subsystem into the fourth subsystem is obtained, so that the carbon-nitrogen ratio of the waste liquid in the fourth subsystem is within the first set range. ​

Images