CN111423072A - Treatment system for fruit and vegetable waste squeezing liquid or fermented biogas liquid and working method - Google Patents
Treatment system for fruit and vegetable waste squeezing liquid or fermented biogas liquid and working method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Fertilizers (AREA)
Abstract
The invention belongs to the technical field of sewage treatment, and particularly relates to a treatment system for fruit and vegetable waste squeezing liquid or fermentation biogas slurry and a working method. The system comprises: the device comprises a pretreatment unit, a biochemical treatment unit, an advanced treatment unit and a sludge dehydration unit. The working method comprises the following steps: the pretreatment unit filters the pressing liquid or biogas slurry and performs flocculation air floatation to generate grid slag and scum; the biochemical treatment unit removes pollutants from the effluent after the flocculation air floatation, and returns and outputs sludge; the advanced treatment unit secondarily removes pollutants from the effluent of the biochemical treatment unit, separates sludge and outputs standard-reaching drainage water; the sludge dewatering unit dewaters the scum and the sludge to generate mud cakes and conveys the mud cakes. Under the current situation that the domestic fruit and vegetable waste squeezing liquid or fermentation biogas slurry treatment industry is in a mature case, the invention adopts the combination and matching of various traditional process units, effectively removes the biochemical indexes of pollutants such as high organic matters, high nitrogen, high phosphorus and the like of the squeezing liquid or biogas slurry, and is suitable for the treatment of various polluted liquids generated by the recycling of organic wastes.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a treatment system for fruit and vegetable waste squeezing liquid or fermentation biogas slurry and a working method.
Background
In recent years, with continuous optimization and adjustment of rural industrial structures, the fruit and vegetable industry in China develops rapidly, the planting area of fruit and vegetable crops is accelerated remarkably, and the proportion of the fruit and vegetable crops in agriculture is also enlarged year by year. A lot of byproducts are generated in the fruit and vegetable processing, and the increase of the processing byproducts is determined by the huge yield of the fruits and vegetables. However, the domestic field of fruit and vegetable waste treatment, especially the resource direction, is still in the exploration stage, and the development and accumulation of technology and engineering are far from foreign countries. The technology for collecting, transporting and treating fruit and vegetable garbage in developed countries abroad develops and deposits for many years and moves to the mature stage, and the pretreatment technology, the anaerobic fermentation technology, the aerobic composting, the aerobic-anaerobic combined treatment method, the squeezed liquid or biogas slurry treatment technology and the like adopted in the treatment aspect are accumulated quite much.
By the limitation of the industry, no mature organic fertilizer utilization market exists at present in China, and the fruit and vegetable squeezed liquid or fermented biogas slurry is mostly treated by sewage. The fruit and vegetable squeezed liquid or biogas slurry belongs to special sewage with high organic matter concentration, high nitrogen and phosphorus, high suspended matter and the like, and when the traditional process is applied to the fruit and vegetable squeezed liquid or biogas slurry, the design risk is large, the treatment difficulty is high, and the resource recovery cannot be realized. In the practical case, the problems such as the failure of one fruit and vegetable garbage, configuration waste, over-design and the like exist, and the domestic fruit and vegetable garbage squeezing liquid or fermentation biogas liquid treatment industry has no success case. The fruit and vegetable waste disposal project is usually remote in site selection, the problem that the treatment facilities of downstream sewage plants are incomplete when the pipe network facilities matched around are not complete or a pipe network is provided frequently occurs, and the determination of the treatment standard of fruit and vegetable squeezing liquid or biogas slurry is very important. The treatment of the fruit and vegetable squeezing liquid or biogas slurry is preferably combined with a planned system to be built, namely how to be well combined with a solid fertilizer, a liquid fertilizer or a semi-finished product preparation system thereof, and the improvement of the resource degree of fruit and vegetable garbage is the major trend in the long run.
Therefore, there is a need to develop a system for treating fruit and vegetable waste pressing liquid or fermented biogas liquid to solve the above problems.
Disclosure of Invention
The invention aims to provide a treatment system and a working method for fruit and vegetable waste squeezing liquid or fermented biogas slurry, and solves the technical problem that the treatment of the fruit and vegetable waste squeezing liquid or fermented biogas slurry can not realize resource utilization.
In order to solve the technical problem, the invention provides a treatment system for fruit and vegetable waste squeezing liquid or fermentation biogas liquid, which comprises:
the device comprises a pretreatment unit, a biochemical treatment unit, an advanced treatment unit and a sludge dehydration unit;
the pretreatment unit is suitable for filtering and flocculating and air-floating fruit and vegetable garbage squeezing liquid or fermented biogas slurry to generate grid slag and floating slag;
the biochemical treatment unit is suitable for receiving the effluent of the pretreatment unit to remove pollutants and separate sludge;
the advanced treatment unit is suitable for receiving the effluent of the biochemical treatment unit to carry out secondary pollutant removal and separating sludge;
the sludge dewatering unit is suitable for dewatering scum and sludge and outputting the generated mud cake.
Further, the biochemical treatment unit comprises a two-stage A/O treatment and sedimentation tank;
the two-stage A/O treatment is suitable for removing pollutants from the effluent of the pretreatment unit;
the sedimentation tank is suitable for sedimentating the effluent of the two-stage A/O treatment and respectively conveying the sedimentated sludge to the two-stage A/O treatment and sludge dewatering units.
Further, the advanced treatment unit comprises a coagulation reaction tank which is suitable for receiving the effluent of the sedimentation tank and carrying out coagulation sedimentation, and the precipitated sludge is conveyed to the sludge dewatering unit.
Further, the advanced treatment unit also comprises an iron-carbon reaction tank or a Fenton reaction sedimentation tank, a two-stage biochemical reaction tank, a final sedimentation tank and a sand filter;
the iron-carbon reaction tank or the Fenton reaction sedimentation tank is suitable for removing the effluent of the sedimentation tank and improving the biodegradability, and the generated sludge is conveyed to the sludge dewatering unit;
the second-stage biochemical reaction tank is suitable for deeply removing the effluent of the iron-carbon reaction tank or the Fenton reaction sedimentation tank;
the final sedimentation tank is suitable for precipitating the effluent of the second-stage biochemical reaction tank and conveying the precipitated sludge to the sludge dewatering unit;
the sand filter is suitable for filtering the effluent of the final sedimentation tank.
Further, the treatment system for the fruit and vegetable waste squeezing liquid or the fermented biogas liquid further comprises a solid-liquid separation unit, a fertilizer fixing unit and a liquid fertilizer unit;
the solid-liquid separation unit is suitable for removing and concentrating fruit and vegetable garbage squeezed liquid or fermented biogas slurry and floating slag before entering the pretreatment unit, and respectively conveying the separated squeezed slag and fine filter liquor to the solid fertilizer unit and the liquid fertilizer unit;
the fertilizer fixing unit is suitable for receiving the pressed slag output by the solid-liquid separation unit and performing fertilizer fixing treatment;
the liquid fertilizer unit is suitable for receiving the fine filtrate output by the solid-liquid separation unit and performing liquid fertilizer treatment.
Further, the solid-liquid separation unit comprises a screw extruder and a micro-filter;
the screw extruder is suitable for removing the concentrated fruit and vegetable garbage squeezing liquid or the fermented biogas slurry and scum and conveying the generated pressing slag to the fertilizer fixing unit;
the micro-filter is suitable for filtering the outlet water of the screw extruder, conveying the filtered fine filtrate to the liquid fertilizer unit, and conveying the filtered coarse filtrate to the pretreatment unit.
In another aspect, the invention also provides a working method of the fruit and vegetable garbage squeezing liquid or the fermentation biogas slurry, which comprises the following steps:
the pretreatment unit is used for filtering and flocculating and air-floating fruit and vegetable garbage squeezing liquid or fermented biogas liquid and generating grid slag and scum;
the biochemical treatment unit carries out pollutant removal on the effluent after the flocculation air floatation, and reflows and outputs sludge separated by the biochemical treatment unit;
the advanced treatment unit carries out secondary pollutant removal on the effluent of the biochemical treatment unit, separates sludge and outputs standard-reaching drainage;
the sludge dewatering unit dewaters the scum and the sludge to generate sludge cakes and conveys the sludge cakes.
Further, delivering the effluent of the advanced treatment unit to an iron-carbon reaction tank or a Fenton reaction sedimentation tank for removing and improving biodegradability, and delivering the generated sludge to a sludge dewatering unit;
conveying the effluent of the iron-carbon reaction tank or the Fenton reaction sedimentation tank to a second-stage biochemical reaction tank for deep removal;
conveying the effluent of the second-stage biochemical reaction tank to a final sedimentation tank for sedimentation;
the precipitated sludge is conveyed to a sludge dewatering unit, and the effluent of the final settling tank is conveyed to a sand filter to filter out suspended matters.
Further, conveying the fruit and vegetable waste squeezing liquid or the fermented biogas liquid to a screw extruder for removing and concentrating, and conveying the generated pressing slag to a fertilizer fixing unit;
and filtering the effluent of the screw extruder, conveying the filtered fine filtrate to a liquid fertilizer unit, and conveying the filtered coarse filtrate to a pretreatment unit.
The treatment system and the working method have the beneficial effects that under the current situation that the domestic fruit and vegetable waste squeezing liquid or fermentation biogas liquid treatment industry is in a mature case, different treatment processes are selected according to different water production standards, and a plurality of traditional process units are adopted for combination and collocation, so that biochemical indexes of pollutants such as high organic matters, high nitrogen (total nitrogen, ammonia nitrogen), high phosphorus and the like in the squeezing liquid or biogas liquid are effectively removed, and the treatment system and the working method can be popularized and applied to treatment of leachate, squeezing liquid, biogas liquid and the like generated in the organic waste recycling process (such as kitchen waste, livestock and poultry waste, fruit and vegetable waste, straws and the like); mature technology, stable treatment effect, easy operation and maintenance, and saved engineering investment and operating cost.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of the structure of the preferred embodiment of the fruit and vegetable waste squeezing liquid or fermented biogas liquid treatment system (nano-tube discharge) of the present invention;
FIG. 2 is a block diagram of the structure of the preferred embodiment of the fruit and vegetable waste squeezing liquid or fermented biogas liquid treatment system (direct discharge) of the present invention;
FIG. 3 is a block diagram of the structure of the preferred embodiment of the fruit and vegetable waste pressing liquid or fermentation biogas slurry treatment system (combined with solid and liquid fertilizer and discharging from a nano-tube) of the present invention;
FIG. 4 is a block diagram of the structure of the preferred embodiment of the fruit and vegetable waste squeezing liquid or fermentation biogas slurry treatment system (combined with solid and liquid fertilizer and directly discharged) of the present invention;
FIG. 5 is a graph of unit removal rates of nano-tube water and straight drainage water of the fruit and vegetable waste squeezing liquid or fermented biogas liquid treatment system of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the system for treating fruit and vegetable waste squeezing liquid or fermented biogas slurry of the embodiment includes a pretreatment unit, a biochemical treatment unit, a deep treatment unit and a sludge dewatering unit; the pretreatment unit is suitable for filtering and flocculating and air-floating fruit and vegetable garbage squeezed liquid or fermented biogas liquid (water quality is shown in table 1) to generate grid slag and scum; the pretreatment unit comprises a grid well and an air floatation device, wherein the grid well is suitable for filtering grid residues of fruit and vegetable garbage squeezing liquid or fermentation biogas slurry, and delivering the water after residue removal to the air floatation device; the air flotation device is suitable for carrying out flocculation air flotation on the effluent of the grid well to generate scum; the biochemical treatment unit is suitable for receiving the effluent of the pretreatment unit, removing pollutants and separating sludge; the advanced treatment unit is suitable for receiving the effluent of the biochemical treatment unit and separating sludge; the sludge dewatering unit is suitable for dewatering the scum and the sludge, and outputting the generated sludge cake to an external biogas manure unit or a fermentation unit for biogas manuring or fermentation. Because the fruit and vegetable garbage squeezing liquid or biogas slurry has weak corrosivity, the high grade can not be adopted in the anticorrosion engineering of equipment and facilities. The fruit and vegetable garbage squeezing liquid or biogas slurry has high chroma and needs to be removed by combining the processes of air flotation, biochemistry, materialization or advanced oxidation and the like. The total phosphorus index in the squeezing liquid or the biogas slurry is combined with air flotation, biochemical phosphorus removal and chemical phosphorus removal, so that the total phosphorus can reach the standard. Under the current situation that the domestic fruit and vegetable waste squeezing liquid or fermentation biogas liquid treatment industry has a mature case, different treatment processes are selected according to different water production standards, and various traditional process units are combined, so that biochemical indexes such as high organic matters, high nitrogen (total nitrogen, ammonia nitrogen), high phosphorus and the like of the squeezing liquid or biogas liquid are effectively removed, and the method can be popularized and used for treating leachate, squeezing liquid, biogas liquid and the like generated in the organic waste recycling process (such as kitchen waste, livestock and poultry waste, fruit and vegetable waste, straws and the like); mature technology, stable treatment effect, easy operation and maintenance, and saved engineering investment and operating cost.
TABLE 1 typical Water quality Meter for squeezing liquid or biogas slurry
As shown in fig. 1, the fruit and vegetable squeezed liquid or biogas slurry is delivered to a grating well through self-flowing or pumping, large impurities or fibers in the fruit and vegetable squeezed liquid or biogas slurry are filtered out and discharged as grating residues to be transported outside; in order to realize the function of the grid well, the grid well has a certain depth, so that the discharged water after deslagging is difficult to convey to the air floatation device, and a lifting water pool is arranged between the grid well and the air floatation device so as to realize buffering and outputting the discharged water after deslagging; and lifting the discharged water after deslagging to an air flotation device by a pump, adding a flocculating agent for reaction, removing most suspended matters, more and more organic matters (indexes such as COD and the like) and more total phosphorus indexes in the sewage, and pumping the scum to a sludge dewatering unit for treatment. When the air flotation device is selected, a pipeline mixing and releasing mode is preferably selected, and the medicament, the dissolved air water and the stock solution are fully mixed and then released, so that the problems of uneven mixing, caking, pollution blockage and the like are avoided. In this embodiment, PAM is preferably added to the preparation. In the embodiment, the air flotation device is adopted for pretreatment, so that an anaerobic reactor is omitted, and the adverse effect of high suspended matters on the anaerobic reactor and related engineering investment are avoided; meanwhile, after the squeezed liquid or the biogas slurry is treated by the air flotation device, the indexes of organic matters and total phosphorus in the sewage can be greatly reduced, and the treatment load of the subsequent process is reduced. An adjusting tank and an emergency tank are arranged between the air floatation device and the biochemical treatment unit in parallel, the water outlet of the air floatation device is suitable for being conveyed to the biochemical treatment unit after being stored, buffered, emergent, averaged and equalized, and the tops of the adjusting tank and the emergency tank are suitable for being sealed. The sludge dewatering unit comprises a sludge storage tank, a No. 1 sludge dewatering device, a sludge concentration tank and a No. 2 sludge dewatering device, scum generated by flocculation of the air floatation device is pumped into the sludge storage tank to be buffered and temporarily stored, then is conveyed to the No. 1 sludge dewatering device to be dewatered to generate sludge cakes, and the sludge cakes are conveyed to the biogas fertilizer unit or the fermentation unit to be subjected to biogas fertilizing or fermentation treatment.
As shown in fig. 1, the biochemical treatment unit includes two stages of a/O treatment and a sedimentation tank, the two stages of a/O treatment include a first stage a/O treatment and a second stage a/O treatment for receiving the effluent of the first stage a/O treatment, and the each stage of a/O treatment includes an a tank and an O tank for receiving the effluent of the a tank. The tank tops of the first-level A tank and the second-level A tank are preferably sealed, and scum and bubble passing holes are formed in the partition wall between each A tank and the corresponding O tank. And each O tank is provided with a defoaming treatment process, and the top of the O tank can be flushed by sewage. The two-stage A/O processing is arranged and operated according to the scale of the system. The nitrifying liquid internal reflux is arranged between every two stages of A/O, and the reasonable reflux ratio is set, so that the denitrification of the system is facilitated. The sewage self-regulation pool is lifted to a biochemical treatment unit, two-stage A/O treatment is adopted in the embodiment (if necessary, a process combining the two-stage A/O treatment and MBR can be adopted, the treatment load of a system is improved, the engineering occupied area is saved), the further removal of indexes such as organic matters, total nitrogen, ammonia nitrogen, total phosphorus, suspended matters, chromaticity and the like is realized, the standard discharge of a nano pipe is realized by the indexes such as the organic matters, the total nitrogen, the ammonia nitrogen and the like, and the mud water is precipitated and separated in a precipitation tank. According to the actual situation of the local climate characteristics, the necessity of arranging a cooling unit in the biochemical treatment unit in summer is evaluated, and the cooling unit needs to be added if necessary. The fruit and vegetable waste squeezing liquid or biogas slurry has sufficient alkalinity, and alkalinity does not need to be supplemented in the process of the biochemical treatment unit. Odor can be released due to anaerobic fermentation in the fruit and vegetable garbage squeezing liquid or biogas slurry treatment process, and odor collection and treatment need to be considered in the adjusting tank, each tank A and the sludge dewatering unit. In addition, for closed facilities, if anaerobic fermentation is possible, the relevant equipment and instruments are preferably considered to be explosion-proof. Considering that the land area is reduced, the effective water depth of the biochemical treatment unit is higher than that of the conventional sewage and can reach 8m, the O tank is recommended to be oxygenated by jet aeration, and a magnetic suspension or air suspension type centrifugal blower is preferably selected. The problem of insufficient organic matters in the secondary A/O treatment can be caused, and the denitrification of the system is influenced, so that a carbon source needs to be properly supplemented to the secondary A pool. The sedimentation tank is suitable for precipitating the effluent of the biochemical treatment unit, one part of precipitated sludge is conveyed to the first-stage A tank and the second-stage A tank in a backflow mode, the other part of precipitated sludge is conveyed to the sludge concentration tank for buffering and temporary storage and then conveyed to the sludge concentration tank and the No. 2 sludge dehydrator for dehydration to generate sludge cakes, and the sludge cakes are conveyed to the biogas fertilizer unit or the fermentation unit for biogas fertilization or fermentation treatment. And (3) conveying the filtrate produced by the 1# sludge dehydrator and the 2# sludge dehydrator and the clear liquid produced by the sludge concentration tank to a lifting water tank, and refluxing to the system for secondary treatment.
As shown in fig. 1, the advanced treatment unit comprises a coagulation reaction tank, which is adapted to receive the effluent from the sedimentation tank and perform coagulation sedimentation, and the separated sludge is delivered to a sludge concentration tank and a # 2 sludge dehydrator for treatment. The effluent of the sedimentation tank enters a coagulation reaction tank, and coagulant is added for reaction, so that indexes such as total phosphorus, suspended matters, chromaticity and the like are further removed; and the effluent of the coagulation reaction tank is sent to a drainage tank for storage or the effluent is discharged after reaching the standard. When the system is abnormal, the drainage of the releasing pool flows back to the emergency pool to store and buffer the average value of the emergency mean values.
In the embodiment, the standard of the nano-tubes is based on the standard of the grade A of the Water quality Standard for Sewage discharge into cities and towns (GB/T31962-2015), and the parameters for removing the sewage indexes of the nano-tubes for drainage are shown in the table 2 in the figure 5.
Example 2
As shown in fig. 2, in the embodiment, in order to solve the problem that the pressing liquid or biogas slurry after treatment does not have a nanotube condition and needs to be directly discharged into a nearby water body, the advanced treatment unit further includes an iron-carbon reaction tank or a fenton reaction sedimentation tank, a two-stage biochemical reaction tank, a final sedimentation tank and a sand filter according to the lifting of the effluent standard on the basis of embodiment 1, and is suitable for deeply removing the effluent of the sedimentation tank. Namely, the pretreatment process of the squeezing liquid or the biogas slurry is a process before the coagulation reaction tank in fig. 1, and is shown in fig. 2. The advanced treatment process added by the advanced treatment unit is a mature, economically feasible process.
As shown in FIG. 2, organic matters such as lignin and the like which are not easily biochemically degraded exist in the causal vegetable garbage pressing liquid or biogas slurry, if the final effluent is directly discharged, a high-grade oxidation or redox process is adopted to improve the biodegradability of the causal vegetable garbage pressing liquid or biogas slurry, and the causal vegetable garbage pressing liquid or biogas slurry enters a second-stage biochemical reaction tank for further removal. Namely, an iron-carbon reaction tank or a Fenton reaction sedimentation tank is arranged, and is suitable for removing the effluent of the sedimentation tank and improving the biodegradability, and the generated sludge is conveyed to a sludge dewatering unit; the second-stage biochemical reaction tank is suitable for deeply removing the effluent of the iron-carbon reaction tank or the Fenton reaction sedimentation tank; the final sedimentation tank is suitable for precipitating the effluent of the second-stage biochemical reaction tank and conveying the precipitated sludge to the sludge dewatering unit; the sand filter is suitable for filtering the effluent of the final sedimentation tank. And the effluent of the sedimentation tank enters an iron-carbon reaction tank or a Fenton reaction sedimentation tank, and is added with an oxidation-reduction reaction agent or a medium for reaction, so that the biodegradability of the sewage is improved while the indexes of organic matters, total phosphorus, suspended matters, chromaticity and the like in the sewage are further removed. And the treated effluent enters a second-stage biochemical reaction tank to deeply remove indexes such as organic matters, nitrogen, phosphorus and the like, and the produced sludge and water are separated in a final sedimentation tank unit. The effluent of the final sedimentation tank can be directly discharged after reaching the standard after filtering suspended matters by a sand filter. And the sludge produced by the final sedimentation tank enters a sludge concentration tank for buffering and temporary storage, and then is conveyed to a 2# sludge dehydrator for dehydration to generate a sludge cake, and the sludge cake is conveyed to a biogas fertilizer unit or a fermentation unit for biogas fertilization or fermentation treatment. And (3) conveying the filtrate generated by the 2# sludge dehydrator and the clear liquid generated by the sludge concentration tank to a lifting water tank, and refluxing to the system for secondary treatment. The air floatation scum and the sludge in the sedimentation tank, the iron-carbon reaction tank or the Fenton reaction sedimentation tank, the second-stage biochemical reaction tank and the final sedimentation tank are all fed into a sludge dewatering unit for treatment. The floating scum can be produced by adopting a sludge storage tank instead of a sludge concentration tank due to the high solid content (5-7%).
The direct discharge standard is based on the first class A of pollutant discharge standard of urban sewage treatment plants, and the sewage index removal parameters of direct discharge are shown in table 3 in table 5.
Example 3
As shown in fig. 3, when recycling is realized by combining the pressing liquid or biogas slurry treatment with the solid fertilizer and the liquid fertilizer, the treatment system for fruit and vegetable waste pressing liquid or fermentation biogas slurry further includes a solid-liquid separation unit, a solid fertilizer unit and a liquid fertilizer unit according to production requirements on the basis of embodiment 1, and is suitable for removing and concentrating the fruit and vegetable waste pressing liquid or fermentation biogas slurry before entering the air flotation device. The treatment process is mature, economical and feasible.
As shown in fig. 3, specifically, the solid-liquid separation unit includes a screw extruder and a micro-filter; the screw extruder is suitable for removing the concentrated fruit and vegetable garbage squeezing liquid or the fermented biogas slurry and scum and conveying the separated pressing slag to the fertilizer fixing unit; the micro-filter is suitable for filtering the effluent of the screw extruder, conveying the filtered fine filtrate to the liquid fertilizer unit, and conveying the filtered coarse filtrate to the air flotation device. The pressing liquid or the biogas liquid is sent to the grid well through self-flow or pumping to filter out large impurities or fibers in the pressing liquid or the biogas liquid. And lifting the sewage to a screw extruder by a pump for solid-liquid separation, removing and concentrating the pressed slag in the sewage, conveying the pressed slag to a solid fertilizer unit for fertilizer treatment, then, allowing the rest sewage to enter a micro-filter for fine separation, conveying the filtered fine filtrate to a liquid fertilizer unit for fertilizer treatment, conveying the filtered coarse filtrate to a lifting water tank, and if the production of liquid fertilizer is not considered, directly pumping the coarse filtrate of the screw extruder to a subsequent sewage treatment process for treatment without arranging the micro-filter in the solid-liquid separation unit. The following sewage treatment process differs from example 1 in that: and (3) removing a sludge storage tank and a No. 1 sludge dehydrator in the system, and conveying scum produced by the air floatation device to a screw press for continuous separation and concentration treatment.
Example 4
As shown in fig. 4, when recycling is realized by combining the pressing liquid or biogas slurry treatment with the solid fertilizer and the liquid fertilizer, the system for treating fruit and vegetable waste pressing liquid or fermented biogas slurry further includes a solid-liquid separation unit, a solid fertilizer unit and a liquid fertilizer unit on the basis of embodiment 2, and is suitable for removing and concentrating the fruit and vegetable waste pressing liquid or fermented biogas slurry before entering the air flotation device. The treatment process is mature, economical and feasible.
The difference between this embodiment and embodiment 3 is the same as that between embodiment 1 and embodiment 2, and the description thereof is omitted.
Example 5
As shown in fig. 1 to 5, on the basis of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4, embodiment 5 provides a working method of fruit and vegetable waste squeezing liquid or fermented biogas slurry, which is implemented by using the processing system of fruit and vegetable waste squeezing liquid or fermented biogas slurry in the above embodiments.
Conveying the fruit and vegetable waste squeezing liquid or the fermentation biogas liquid to a screw extruder for removing and concentrating, and conveying the separated pressing slag to a fertilizer fixing unit; and filtering the effluent of the screw extruder, conveying the filtered fine filtrate to a liquid fertilizer unit, and conveying the filtered coarse filtrate to a pretreatment unit.
The pretreatment unit is used for filtering and flocculating and air-floating fruit and vegetable garbage squeezing liquid or fermented biogas liquid and generating grid slag and scum; the biochemical treatment unit carries out pollutant removal on the effluent after the flocculation air floatation and reflows sludge separated by the biochemical treatment unit; the advanced treatment unit carries out secondary pollutant removal on the effluent of the biochemical treatment unit, separates sludge and outputs standard-reaching drainage; the sludge dewatering unit dewaters the scum and the sludge to generate sludge cakes and conveys the sludge cakes.
Delivering the effluent of the advanced treatment unit to an iron-carbon reaction tank or a Fenton reaction sedimentation tank for removing and improving biodegradability, and delivering the generated sludge to a sludge dewatering unit; conveying the effluent of the iron-carbon reaction tank or the Fenton reaction sedimentation tank to a second-stage biochemical reaction tank for deep removal; conveying the effluent of the second-stage biochemical reaction tank to a final sedimentation tank for sedimentation; the precipitated sludge is conveyed to a sludge dewatering unit, and the effluent of the final settling tank is conveyed to a sand filter to filter out suspended matters.
In conclusion, under the current situation that the fruit and vegetable waste squeezing liquid or fermentation biogas slurry treatment industry in China is a rare case, different treatment processes are selected according to different water production standards, and a plurality of traditional process units are adopted for combination and collocation, so that biochemical indexes of pollutants such as high organic matters, high nitrogen (total nitrogen, ammonia nitrogen), high phosphorus and the like in the squeezing liquid or biogas slurry are effectively removed, and the system and the working method can be popularized and applied to treatment of percolate, squeezing liquid, biogas slurry and the like generated in the organic waste recycling process (such as kitchen waste, livestock and poultry waste, fruit and vegetable waste, straws and the like); mature technology, stable treatment effect, easy operation and maintenance, and saved engineering investment and operating cost.
The components selected for use in the present application (components not illustrated for specific structures) are all common standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experimentation.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The utility model provides a processing system of fruit vegetables rubbish squeeze liquid or fermentation natural pond liquid which characterized in that includes:
the device comprises a pretreatment unit, a biochemical treatment unit, an advanced treatment unit and a sludge dehydration unit;
the pretreatment unit is suitable for filtering and flocculating and air-floating fruit and vegetable garbage squeezing liquid or fermented biogas slurry to generate grid slag and floating slag;
the biochemical treatment unit is suitable for receiving the effluent of the pretreatment unit to remove pollutants and separate sludge;
the advanced treatment unit is suitable for receiving the effluent of the biochemical treatment unit to carry out secondary pollutant removal and separating sludge;
the sludge dewatering unit is suitable for dewatering scum and sludge and outputting the generated mud cake.
2. The system for treating the fruit and vegetable garbage squeezing liquid or the fermented biogas liquid according to claim 1,
the biochemical treatment unit comprises a two-stage A/O treatment and sedimentation tank;
the two-stage A/O treatment is suitable for removing pollutants from the effluent of the pretreatment unit;
the sedimentation tank is suitable for sedimentating the effluent of the two-stage A/O treatment and respectively conveying the sedimentated sludge to the two-stage A/O treatment and sludge dewatering units.
3. The system for treating the fruit and vegetable garbage squeezing liquid or the fermented biogas liquid according to claim 2,
the advanced treatment unit comprises a coagulation reaction tank which is suitable for receiving the effluent of the sedimentation tank and carrying out coagulation sedimentation, and the precipitated sludge is conveyed to the sludge dewatering unit.
4. The system for treating the fruit and vegetable garbage squeezing liquid or the fermented biogas liquid according to claim 3,
the advanced treatment unit also comprises an iron-carbon reaction tank or a Fenton reaction sedimentation tank, a two-stage biochemical reaction tank, a final sedimentation tank and a sand filter;
the iron-carbon reaction tank or the Fenton reaction sedimentation tank is suitable for removing the effluent of the sedimentation tank and improving the biodegradability, and the generated sludge is conveyed to the sludge dewatering unit;
the second-stage biochemical reaction tank is suitable for deeply removing the effluent of the iron-carbon reaction tank or the Fenton reaction sedimentation tank;
the final sedimentation tank is suitable for precipitating the effluent of the second-stage biochemical reaction tank and conveying the precipitated sludge to the sludge dewatering unit;
the sand filter is suitable for filtering the effluent of the final sedimentation tank.
5. The system for treating the fruit and vegetable garbage squeezing liquid or the fermented biogas liquid according to claim 1,
the treatment system for the fruit and vegetable waste squeezing liquid or the fermentation biogas slurry further comprises a solid-liquid separation unit, a fertilizer fixing unit and a liquid fertilizer unit;
the solid-liquid separation unit is suitable for removing and concentrating fruit and vegetable garbage squeezed liquid or fermented biogas slurry and floating slag before entering the pretreatment unit, and respectively conveying the separated squeezed slag and fine filter liquor to the solid fertilizer unit and the liquid fertilizer unit;
the fertilizer fixing unit is suitable for receiving the pressed slag output by the solid-liquid separation unit and performing fertilizer fixing treatment;
the liquid fertilizer unit is suitable for receiving the fine filtrate output by the solid-liquid separation unit and performing liquid fertilizer treatment.
6. The system for treating the fruit and vegetable garbage squeezing liquid or the fermented biogas liquid according to claim 5,
the solid-liquid separation unit comprises a screw extruder and a micro-filter;
the screw extruder is suitable for removing the concentrated fruit and vegetable garbage squeezing liquid or the fermented biogas slurry and scum and conveying the generated pressing slag to the fertilizer fixing unit;
the micro-filter is suitable for filtering the outlet water of the screw extruder, conveying the filtered fine filtrate to the liquid fertilizer unit, and conveying the filtered coarse filtrate to the pretreatment unit.
7. A working method of fruit and vegetable waste squeezing liquid or fermented biogas liquid is characterized by comprising the following steps:
the pretreatment unit is used for filtering and flocculating and air-floating fruit and vegetable garbage squeezing liquid or fermented biogas liquid and generating grid slag and scum;
the biochemical treatment unit carries out pollutant removal on the effluent after the flocculation air floatation, and reflows and outputs sludge separated by the biochemical treatment unit;
the advanced treatment unit carries out secondary pollutant removal on the effluent of the biochemical treatment unit, separates sludge and outputs standard-reaching drainage;
the sludge dewatering unit dewaters the scum and the sludge to generate sludge cakes and conveys the sludge cakes.
8. The working method of the fruit and vegetable garbage squeezing liquid or the fermentation biogas slurry according to claim 7,
delivering the effluent of the advanced treatment unit to an iron-carbon reaction tank or a Fenton reaction sedimentation tank for removing and improving biodegradability, and delivering the generated sludge to a sludge dewatering unit;
conveying the effluent of the iron-carbon reaction tank or the Fenton reaction sedimentation tank to a second-stage biochemical reaction tank for deep removal;
conveying the effluent of the second-stage biochemical reaction tank to a final sedimentation tank for sedimentation;
the precipitated sludge is conveyed to a sludge dewatering unit, and the effluent of the final settling tank is conveyed to a sand filter to filter out suspended matters.
9. The working method of the fruit and vegetable garbage squeezing liquid or the fermentation biogas slurry according to claim 7 or 8,
conveying the fruit and vegetable waste squeezing liquid or the fermented biogas liquid to a screw extruder for removing and concentrating, and conveying the generated pressing slag to a fertilizer fixing unit;
and filtering the effluent of the screw extruder, conveying the filtered fine filtrate to a liquid fertilizer unit, and conveying the filtered coarse filtrate to a pretreatment unit.
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Application publication date: 20200717 |