CN113458124B - Kitchen waste treatment system and method - Google Patents
Kitchen waste treatment system and method Download PDFInfo
- Publication number
- CN113458124B CN113458124B CN202110846356.7A CN202110846356A CN113458124B CN 113458124 B CN113458124 B CN 113458124B CN 202110846356 A CN202110846356 A CN 202110846356A CN 113458124 B CN113458124 B CN 113458124B
- Authority
- CN
- China
- Prior art keywords
- kitchen waste
- pulping
- solid
- treatment
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010806 kitchen waste Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 230000001954 sterilising effect Effects 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 239000007791 liquid phase Substances 0.000 claims abstract description 19
- 239000012528 membrane Substances 0.000 claims abstract description 19
- 230000029087 digestion Effects 0.000 claims abstract description 15
- 239000012071 phase Substances 0.000 claims abstract description 14
- 238000005188 flotation Methods 0.000 claims abstract description 3
- 238000004537 pulping Methods 0.000 claims description 50
- 239000002002 slurry Substances 0.000 claims description 22
- 239000004576 sand Substances 0.000 claims description 21
- 239000002893 slag Substances 0.000 claims description 19
- 238000004659 sterilization and disinfection Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- 239000005416 organic matter Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 8
- 238000000108 ultra-filtration Methods 0.000 claims description 7
- 239000007790 solid phase Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000008346 aqueous phase Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 16
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000007857 degradation product Substances 0.000 abstract description 2
- 239000010813 municipal solid waste Substances 0.000 description 22
- 230000008569 process Effects 0.000 description 8
- 235000002566 Capsicum Nutrition 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000006002 Pepper Substances 0.000 description 4
- 241000722363 Piper Species 0.000 description 4
- 235000016761 Piper aduncum Nutrition 0.000 description 4
- 235000017804 Piper guineense Nutrition 0.000 description 4
- 235000008184 Piper nigrum Nutrition 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 240000008574 Capsicum frutescens Species 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 239000001390 capsicum minimum Substances 0.000 description 2
- 238000009264 composting Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a kitchen waste treatment system and a kitchen waste treatment method. The system comprises a pulper, a desanding system, a sterilizing device, a two-phase centrifuge, an anaerobic digestion container, a solid-liquid separation system, an A/O reaction system and a membrane treatment system which are connected in sequence; the solid-liquid separation system comprises a centrifugal machine, an air flotation machine and a rotary drum grating machine which are sequentially connected along the water flow direction. The kitchen waste treatment system and the kitchen waste treatment method can realize high-precision separation of organic matters and impurities; the yield of the biological anaerobic degradation products is high, and the recycling rate of kitchen waste is high; the liquid phase has high purity, which is beneficial to the stability of the subsequent anaerobic system; the effluent of the anaerobic system is treated by the solid-liquid separation system, so that the stable and reliable operation of the subsequent A/O reaction system and the membrane system is ensured, and the full resource utilization of kitchen waste at low cost is finally realized.
Description
Technical Field
The invention relates to the technical field of garbage disposal, in particular to a kitchen garbage disposal system and a kitchen garbage disposal method.
Background
At present, except for two main harmless treatment processes of landfill and incineration, the independent treatment of kitchen waste mainly adopts biochemical treatment and resource utilization, and the biochemical treatment mainly adopts two main treatment processes of anaerobic digestion and aerobic composting. Compared with the traditional aerobic composting process, the anaerobic digestion process has the advantages that the reaction is carried out in a closed environment, the environmental influence is relatively small, and the anaerobic digestion process has great advantages on the influence of the surrounding environment and the utilization of the final product, and represents the current mainstream development direction.
Because the anaerobic digestion technology only acts on organic matters, and the kitchen waste is a mixture of the organic matters and non-biodegradable impurities, a kitchen waste pretreatment system is required to be configured to separate the organic matters from the non-biodegradable materials affecting anaerobic digestion treatment. The current pretreatment technology is classified into mechanical sorting and mechanical pulping technologies.
The mechanical separation generally adopts various screening devices, which can separate organic components by screening under the assumption that organic matters in the organic garbage accord with the particle size distribution rule. But suffer from the following drawbacks: (1) In principle, organic matters in the garbage do not accord with the size rule, only have the probability sorting significance, and the particle size sorting inevitably causes a great deal of organic matter loss; (2) the bagged refuse must be broken; (3) The sorted and rejected materials are still garbage, garbage treatment is also needed, and the reduction rate is low.
The mechanical pulping generally adopts crushing pulping or squeezing pulping, and organic matters are separated through a sieve plate after being crushed by mechanical force. But suffer from the following drawbacks: (1) Crushing pulping can cause a large amount of impurities to be crushed together into slurry, so that the subsequent impurity removal is difficult; (2) The pressed pulping organic matters are adhered and taken away by impurities, and the recovery rate of the organic matters is extremely low.
Disclosure of Invention
The kitchen waste treatment system and the kitchen waste treatment method can realize high-precision separation of organic matters and impurities, are convenient for full-resource utilization of waste components, are stable and reliable in operation, and meet treatment requirements at low cost.
Specifically, the invention adopts the following technical scheme:
A kitchen waste treatment system comprising:
the pulping machine comprises a pulping cavity, a rotor arranged in the pulping cavity, a kitchen waste inlet and a slag discharge port arranged on the wall of the pulping cavity, and a sieve plate arranged at the opening at the bottom of the pulping cavity, wherein a liquid discharge port is arranged below the sieve plate;
the sand removal system is communicated with a liquid outlet of the pulper;
The sterilization device is communicated with the liquid outlet of the sand removal system;
and the two-phase centrifugal machine is communicated with the discharge port of the sterilization device and is used for separating materials from the sterilization device into a liquid phase and a solid phase.
According to the pulping machine, the vortex field is formed by the garbage flow through the rotor, and in 3-5 minutes, the organic garbage can be decomposed into organic matter slurry and residues such as fibers, plastics, fabrics, inert matters and the like. The separated slag can be directly incinerated after dehydration, and the separated organic slurry enters a sterilization device after fine, light and heavy impurities are removed by a sand removal system, so that the sterilization and deodorization of kitchen waste are realized. The sterilized slurry is sent to a two-phase centrifuge for solid-liquid separation, solid phase outward transportation is carried out, and the liquid phase contains about 0.3 percent of grease, so that an anaerobic fermentation device such as a CSTR reactor has better tolerance to the grease, and the liquid phase can be directly sent to a rear-end anaerobic fermentation device without further separating the grease. And (3) after the anaerobic treatment, the biogas slurry is subjected to centrifugation, air floatation and filtration treatment, enters a subsequent O/A system and a membrane system for treatment, and finally reaches the discharge standard.
The inventor finds that effluent after anaerobic treatment of a liquid phase of the two-phase centrifugal machine is different from anaerobic effluent of common high-concentration wastewater, sludge in a digestion liquid phase is in a suspension state, the concentration is generally 10000-20000 mg/L, the sludge enters a subsequent O/A system and a membrane system after direct entering or centrifugal treatment, huge load is caused on the subsequent sewage treatment system, the membrane system is easy to be blocked, and a bag filter in an external ultrafiltration membrane system needs to be cleaned in half an hour, even the sludge cannot be operated at all. In order to solve the defects, the inventor finds that in the research process, the anaerobic effluent is subjected to a solid-liquid separation system which is subjected to centrifugal separation by a centrifugal machine, then air floatation by an air floatation machine and finally filtration by a rotary drum grating machine before the A/O reaction system, so that the operation load of the subsequent A/O reaction system and the membrane system can be effectively reduced, the stable operation of the system is ensured, and meanwhile, the low operation cost is also considered.
Preferably, in the kitchen waste treatment system, the rotor comprises a rotating shaft and a pulping blade spirally arranged on the rotating shaft, and the pulping blade is spirally reduced in diameter from the bottom end of the rotating shaft to the top end in a anticlockwise or clockwise direction. More preferably, the rotor is vertically upwards arranged above the sieve plate, and even more preferably, a bed knife is arranged at the joint of the rotor and the sieve plate.
Preferably, in the kitchen waste treatment system, the ratio of the maximum value of the spiral diameter of the pulping blade to the diameter of the rotating shaft is 11-13:1; and/or the ratio of the maximum value of the spiral diameter of the pulping blade to the height of the rotating shaft is 0.8-1.2:2. Therefore, the kitchen waste flows are ensured to form a strong vortex field, and the effects of tearing, friction and rubbing formed by the differential speed among the various flow layers of the vortex are utilized to achieve the effect of maximally decomposing objects in the waste into substance components, and meanwhile, the abrasion and blockage of equipment are reduced.
Preferably, in the kitchen garbage treatment system, the diameter of the sieve holes on the sieve plate isUnder the diameter of the sieve holes, the high-precision separation of organic matters and impurities can be ensured, and the full resource utilization of garbage components is facilitated.
Preferably, in the kitchen waste treatment system, the pulping machine comprises an annular water spray pipe, and the annular water spray pipe is arranged at the top in the pulping cavity. The annular spray pipe can be used for adjusting the solid content of garbage, and can clean slag after pulping treatment, so as to further recover organic matters adhered to the slag.
Preferably, in the kitchen garbage treatment system, the pulping machine comprises a pulp baffle plate, wherein the pulp baffle plate is arranged on the inner wall of the pulping cavity, so that vortex of wet garbage can be effectively destroyed, the decomposition speed is increased, the decomposition time is reduced, and the abrasion of the tank body is reduced.
Preferably, in the kitchen garbage treatment system, the sand removal system comprises a high-concentration sand remover and a sand-water separator which are sequentially connected. The sand removing system can ensure that fine heavy materials such as fine sand stone, shells and the like in slurry and fine light materials such as pepper particles, capsicum skin, fine plastic sheets and the like are effectively removed.
Preferably, in the kitchen waste treatment system, the sterilization device adopts a heat sterilization mode.
Preferably, the kitchen garbage treatment system further comprises a heat exchanger, wherein the heat exchanger is used for transferring part of heat of the liquid phase discharged from the two-phase centrifugal machine to slurry to be flowed into the sterilizing device, so that the temperature of the incoming material of the sterilizing device is increased, and the heat consumption is reduced.
Preferably, in the kitchen garbage treatment system, the kitchen garbage treatment system further comprises a screw press, wherein the screw press is connected with a slag discharging port of the pulper and is used for dehydrating slag separated by the pulper.
Aiming at the characteristics of high water content and high organic matter content of kitchen waste, in order to fully utilize the organic matters in a recycling way, the anaerobic digestion vessel is preferably a continuous stirred tank reactor CSTR, and the temperature is further preferably controlled at 35+/-3 ℃.
In order to ensure complete denitrification and meet the requirement of 40mg/L of total nitrogen emission limit, the A/O reaction system preferably comprises a primary A/O reaction unit and a secondary A/O reaction unit which are sequentially connected along the water flow direction.
Preferably, in the kitchen waste treatment system, the membrane treatment system is an external ultrafiltration membrane.
The invention also provides a method for treating kitchen waste by adopting the kitchen waste treatment system, which is characterized by comprising the following steps:
(1) The kitchen waste enters a pulper for pulpifying treatment, and the kitchen waste is decomposed into organic matter slurry and slag;
(2) The organic matter slurry enters a sand removal system for sand removal treatment;
(3) The effluent of the sand removal system enters a sterilization device for sterilization treatment;
(4) The effluent of the sterilizing device enters a two-phase separator and is separated into a liquid phase and a solid phase;
(5) The liquid phase enters an anaerobic digestion container for anaerobic treatment;
(6) The effluent of the anaerobic digestion vessel enters a solid-liquid separation system for solid-liquid separation;
(7) The effluent of the solid-liquid separation system enters an A/O reaction system for biochemical treatment;
(8) The effluent of the A/O reaction system enters a membrane treatment system for filtration;
further preferably, in the step (1), before the pulping treatment, the method further comprises the step of adjusting the solid content of the kitchen waste to 14-16 wt%;
and/or in the step (1), in the pulping treatment, the rotating speed of the rotor is 150-250 r/min;
And/or in the step (3), the temperature of the sterilization treatment is 70-80 ℃ and the time is 20-30 min;
And/or, in the solid-liquid separation system, the rotating speed of the centrifugal machine is 1500-2500 r/min, and the grid gap of the rotary drum grid machine is 0.1-1 mm.
The beneficial effects obtained by the invention are as follows:
The kitchen waste treatment system and the kitchen waste treatment method provided by the invention can realize high-precision separation of organic matters and impurities; the yield of the biological anaerobic degradation products is high, and the recycling rate of kitchen waste is high; the liquid phase has high purity, which is beneficial to the stability of the subsequent anaerobic system; the effluent of the anaerobic system is treated by the solid-liquid separation system, so that the stable and reliable operation of the subsequent A/O reaction system and the membrane system is ensured, and the full resource utilization of kitchen waste at low cost is finally realized.
Drawings
Fig. 1 shows a schematic view of a kitchen waste pretreatment system according to embodiment 1.
Fig. 2 shows a schematic view of a pulper according to example 1, wherein the 10-pulper cavity, the 11-rotor, the 12-kitchen waste inlet, the 13-slag discharge, the 14-screen plate, the 15-liquid discharge, the 16-annular water jet, the 17-baffle.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention. The specific techniques or conditions are not identified in the examples and are described in the literature in this field or are carried out in accordance with the product specifications.
In the description of the present invention, unless otherwise indicated, the terms "upper," "lower," and the like refer to an orientation or state relationship based on that shown in the drawings, for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the following examples, the equipment and the like used were conventional products available for purchase by a regular channel manufacturer, without specifying the manufacturer. The methods are conventional methods unless otherwise specified, and the starting materials are commercially available from the public sources unless otherwise specified.
Example 1
A kitchen garbage treatment system (refer to figure 1 in part) comprises a receiving hopper, a slurrying machine, a discharge tank (connected with a liquid outlet of the slurrying machine), a high-concentration sand remover, a sand-water separator, a heat exchanger (tube pass), a sterilization tank, a two-phase centrifuge, a water buffer tank (connected with a liquid phase outlet of the two-phase centrifuge), a heat exchanger (shell pass), a filtrate tank, an anaerobic tank, a centrifuge, an air floatation machine, a rotary drum grille machine, a middle water tank, a primary A/O reaction unit, a secondary A/O reaction unit and an external ultrafiltration membrane which are sequentially connected along the water flow direction;
the screw press is connected with a slag discharging port of the pulper;
The pulping machine (refer to fig. 2 in part) comprises a pulping cavity 10, a rotor 11 arranged in the pulping cavity, a kitchen waste inlet 12 and a slag discharging port 13 arranged on the wall of the pulping cavity, and a sieve plate 14 arranged at the opening at the bottom of the pulping cavity, wherein a liquid outlet 15 is arranged below the sieve plate;
The rotor 11 is vertically upwards arranged above the sieve plate and comprises a rotating shaft and a pulping blade spirally arranged on the rotating shaft, wherein the pulping blade is clockwise rotated from the bottom end to the top end of the rotating shaft, the diameter of the spiral is gradually decreased, and the diameter of the spiral is gradually decreased to 0 when the diameter of the spiral is gradually decreased to the top end; the ratio of the maximum value of the spiral diameter of the pulping blade to the diameter of the rotating shaft is 12:1, and the ratio of the maximum value of the spiral diameter of the pulping blade to the height of the rotating shaft is 1:2;
The pulper 2 further comprises an annular water spray pipe 16 arranged at the top of the pulping cavity and a pulp baffle 17 arranged on the inner wall of the pulping cavity;
The anaerobic tank is a Continuous Stirred Tank Reactor (CSTR);
The grid gap of the rotary drum grid machine is 0.5mm.
Example 2
The system of the embodiment 1 is adopted to pretreat kitchen waste according to the method of the invention, and the method specifically comprises the following steps:
(1) Kitchen garbage is discharged into the receiving hopper, and is put in after being classified, so that the water content is relatively low, the material size is relatively large, more non-perishable garbage can be mixed in the initial stage of garbage classification or in the classification putting setting, and the grab bucket type feeding is adopted to ensure the process to be smooth. The components of the kitchen waste are shown in table 1.
Table 1 kitchen waste composition table
(2) Kitchen waste is fed from a receiving hopper to a pulper (the equipment parameters are shown in table 2) in a grab bucket mode, industrial water is added into the pulper through an annular water spray pipe to adjust the solid content of the kitchen waste to be 15%, a rotor is started to rotate for pulping, the rotor enables the waste to flow to form a strong vortex field, and in 3-5 minutes, organic waste can be decomposed into organic matter slurry and slag. The organic matter slurry flows downwards through the sieve plate, is pumped to a discharge tank through a liquid outlet for storage, slag is dehydrated through a screw squeezer through a slag discharge port, and the non-biodegradable material after dehydration can be directly incinerated.
Table 2 pulper equipment parameters
(3) The slurry in the discharge tank is sequentially discharged from the high-concentration sand remover and the sand-water separator to remove fine heavy materials such as fine sand stone, shells and the like in the slurry, and fine light materials such as pepper particles, capsicum skin, fine plastic sheets and the like are fed into the heat exchanger, and the liquid phase discharged by the two-phase centrifugal machine participates in the heat exchange process of the heat exchanger, so that the temperature of the slurry is increased.
(4) The organic slurry from the heat exchanger enters a sterilizing tank, and is kept at a high temperature of 75 ℃ for 25min, so that the sterilizing and deodorizing of kitchen waste are realized.
(5) And sending the sterilized slurry into a two-phase centrifuge for solid-liquid separation. The solid phase is cooperatively burned or can be used as a dry anaerobic raw material, the liquid phase uses waste heat to preheat the slurry of the heat exchanger, then the slurry is cooled to about 38-40 ℃, and the slurry is pumped to a filtrate tank for entering a subsequent anaerobic system for treatment.
After the kitchen waste is treated by the steps, the technical effects that the removal rate of non-degradable light and heavy impurities is 95%, the removal rate of fine slag impurities is 96%, and the yield of biodegradable materials is 94% are achieved. Wherein, the non-degradable light and heavy impurities mainly refer to heavy substances which are not easy to break, such as plastic bags, cloth strips, metals and the like; the fine residue mainly refers to fine sand, fine residue formed by crushing shells, bones and other substances, and lighter pepper particles, pepper peels and other substances which are difficult to crush.
(6) The liquid phase in the filtrate tank is sent into an anaerobic tank for anaerobic treatment, the temperature is controlled at 35 ℃, and the stirring mode is top stirring; the daily treatment capacity of kitchen waste is calculated to be 100 tons, the daily feeding capacity of the anaerobic tank is 81 tons, the daily yield of methane reaches 5296m 3, namely the gas yield is 53m 3/ton, and the economic benefit is obvious.
(7) And (3) treating by a solid-liquid separation system: adding a proper amount of PAM reagent into the liquid phase after anaerobic treatment, entering a centrifugal machine, and enabling the centrifugal filtrate to enter an air floatation machine, wherein the concentration of air floatation feeding is 0.5-2%; adding a proper amount of PAM and PAC liquid medicine into an air floatation machine, removing certain chemical precipitation of TP in water while further removing SS, and enabling air floatation effluent to enter an intermediate regulating tank after further intercepting residual SS in water by a rotary drum grating machine.
(8) After water is distributed by the middle regulating tank, the waste water enters a two-stage AO reaction system, most of organic matters and ammonia nitrogen in the solution are converted into inorganic matters (CO 2、H2O、N2) to be removed from water, and the small part of the organic matters and ammonia nitrogen are converted into cellular matters to be discharged out of the system through periodic mud discharge, and the effluent of the AO reaction system passes through an external ultrafiltration membrane to remove residual pollutants, so that the requirement of effluent water quality emission standard is met.
The bag filters in the external ultrafiltration membrane of this embodiment need to be cleaned once a day.
Comparative example 1
Compared with the embodiment 2, the difference is that in the step (2), the industrial water is added into the pulper through the annular water spray pipe to adjust the solid content of the kitchen waste to 17 percent.
Through detection, the removal rate of the non-degradable light and heavy impurities is 92%, the removal rate of the fine slag impurities is 95%, and the yield of the biodegradable materials is 87%.
Comparative example 2
The only difference compared with example 2 is that in the rotor of the pulper, the ratio of the maximum value of the spiral diameter of the pulping blade to the diameter of the rotating shaft is 10:1, and the ratio of the maximum value of the spiral diameter of the pulping blade to the height of the rotating shaft is 1:3.
Through detection, the removal rate of the non-degradable light and heavy impurities is 95%, the removal rate of the fine slag impurities is 95%, and the yield of the biodegradable materials is 82%.
Comparative example 3
The difference from example 2 is that the air flotation machine treatment is not included in the step (7), and the centrifugal filtrate after the centrifugal machine treatment is directly fed into the rotary drum grating machine for treatment.
The bag filters in the external ultrafiltration membranes of this comparative example required 4h of cleaning.
While the invention has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (7)
1. A kitchen waste treatment system, comprising:
the pulping machine comprises a pulping cavity, a rotor arranged in the pulping cavity, a kitchen waste inlet and a slag discharge port arranged on the wall of the pulping cavity, and a sieve plate arranged at the opening at the bottom of the pulping cavity, wherein a liquid discharge port is arranged below the sieve plate; the diameter of the sieve holes on the sieve plate is phi, and phi is more than or equal to 6mm and less than or equal to 8mm;
The sand removal system is communicated with a liquid outlet of the pulper; the pulping machine comprises an annular water spray pipe, and the annular water spray pipe is arranged at the inner top of the pulping cavity;
The sterilization device is communicated with the liquid outlet of the sand removal system;
The two-phase centrifuge is communicated with the discharge port of the sterilization device and is used for separating materials from the sterilization device into a liquid phase and a solid phase;
an anaerobic digestion vessel in communication with the aqueous phase outlet of the two-phase centrifuge;
the solid-liquid separation system is communicated with a liquid outlet of the anaerobic digestion container; the solid-liquid separation system comprises a centrifuge, an air flotation machine and a rotary drum grating machine which are sequentially connected along the water flow direction;
The A/O reaction system is communicated with a liquid outlet of the solid-liquid separation system;
the membrane treatment system is communicated with the liquid outlet of the A/O reaction system;
The rotor comprises a rotating shaft and a pulping blade spirally arranged on the rotating shaft, wherein the pulping blade is spirally anticlockwise or clockwise from the bottom end of the rotating shaft to the top end, and the diameter of the spiral is gradually decreased; the ratio of the maximum value of the spiral diameter of the pulping blade to the diameter of the rotating shaft is 11-13:1; the ratio of the maximum value of the spiral diameter of the pulping blade to the height of the rotating shaft is 0.8-1.2:2.
2. A kitchen waste treatment system according to claim 1, wherein the sand removal system comprises a high-concentration sand remover and a sand-water separator connected in sequence.
3. A kitchen waste treatment system according to claim 1 or 2, wherein the sterilizing means is a thermal sterilization means.
4. A kitchen waste treatment system according to claim 1 or 2, further comprising a heat exchanger arranged to transfer a portion of the heat of the liquid phase discharged from the two-phase centrifuge to the heat exchanger of the slurry to be flowed into the sterilizing device;
and/or, the device further comprises a screw press, wherein the screw press is connected with a slag discharging port of the pulper.
5. A kitchen waste treatment system according to claim 1 or 2, characterized in that the anaerobic digestion vessel is a continuous stirred tank reactor.
6. The kitchen waste treatment system according to claim 1 or 2, wherein the a/O reaction system comprises a primary a/O reaction unit and a secondary a/O reaction unit which are sequentially connected in a water flow direction;
and/or the membrane treatment system is an external ultrafiltration membrane.
7. A method of treating kitchen waste using the kitchen waste treatment system of any one of claims 1 to 6, comprising the steps of:
(1) The kitchen waste enters a pulper for pulpifying treatment, and the kitchen waste is decomposed into organic matter slurry and slag;
(2) The organic matter slurry enters a sand removal system for sand removal treatment;
(3) The effluent of the sand removal system enters a sterilization device for sterilization treatment;
(4) The effluent of the sterilization device enters a two-phase centrifuge and is separated into a liquid phase and a solid phase;
(5) The liquid phase enters an anaerobic digestion container for anaerobic treatment;
(6) The effluent of the anaerobic digestion vessel enters a solid-liquid separation system for solid-liquid separation;
(7) The effluent of the solid-liquid separation system enters an A/O reaction system for biochemical treatment;
(8) The effluent of the A/O reaction system enters a membrane treatment system for filtration;
In the step (1), before the pulping treatment, the method further comprises the step of adjusting the solid content of the kitchen waste to 14-16wt%;
And/or in the step (1), in the pulping treatment, the rotating speed of the rotor is 150-250 r/min;
and/or in the step (3), the temperature of the sterilization treatment is 70-80 ℃ and the time is 20-30 min;
And/or in the solid-liquid separation system, the rotating speed of the centrifugal machine is 1500-2500 r/min, and the grid gap of the rotary drum grid machine is 0.1-1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110846356.7A CN113458124B (en) | 2021-07-26 | 2021-07-26 | Kitchen waste treatment system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110846356.7A CN113458124B (en) | 2021-07-26 | 2021-07-26 | Kitchen waste treatment system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113458124A CN113458124A (en) | 2021-10-01 |
| CN113458124B true CN113458124B (en) | 2024-05-28 |
Family
ID=77882468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110846356.7A Active CN113458124B (en) | 2021-07-26 | 2021-07-26 | Kitchen waste treatment system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113458124B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113896380B (en) * | 2021-11-15 | 2023-09-05 | 美都生态环境科技(天津)有限公司 | Urban garbage leakage liquid treatment process |
| CN114716057A (en) * | 2022-03-25 | 2022-07-08 | 上海市政工程设计研究总院（集团）有限公司 | Kitchen waste dry anaerobic fermentation biogas slurry solid-liquid separation system and method |
| CN115301672A (en) * | 2022-06-30 | 2022-11-08 | 广西博世科环保科技股份有限公司 | Comprehensive treatment method for kitchen garbage |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102950137A (en) * | 2011-08-19 | 2013-03-06 | 光大环保科技发展（北京）有限公司 | Kitchen waste collaborative processing method |
| CN203803586U (en) * | 2014-04-14 | 2014-09-03 | 瑞科际再生能源股份有限公司 | Kitchen waste pulping device |
| CN205288592U (en) * | 2015-11-19 | 2016-06-08 | 北京京城环保股份有限公司 | Homogenate preprocessing device is selected separately in slurrying in kitchen garbage anaerobic fermentation technology |
| CN105925361A (en) * | 2016-04-13 | 2016-09-07 | 江苏维尔利环保科技股份有限公司 | Pretreatment method of anaerobic digestion treatment of kitchen garbage |
| CN205926564U (en) * | 2016-07-29 | 2017-02-08 | 上海浦东环保发展有限公司 | A complete sets that is used for kitchen garbage preliminary treatment edulcoration, proposes oil and slurrying |
| CN108097401A (en) * | 2018-02-08 | 2018-06-01 | 广东瀚蓝生物环保科技有限公司 | A kind of executive device, size degradation pulp all-in-one machine and kitchen garbage processing system |
| CN109513722A (en) * | 2018-10-23 | 2019-03-26 | 东莞理工学院 | A kind of restaurant garbage treating system and processing method |
| CN110343726A (en) * | 2019-06-04 | 2019-10-18 | 无锡市政设计研究院有限公司 | A kind of cooperative processing method of food garbage and rubbish from cooking |
| CN110976472A (en) * | 2019-11-14 | 2020-04-10 | 武汉龙净环保工程有限公司 | Kitchen waste and household waste co-processing method |
| CN111099781A (en) * | 2019-12-31 | 2020-05-05 | 北京嘉博文生物科技有限公司 | Pretreatment device and method for kitchen waste leachate |
| CN111318552A (en) * | 2020-03-30 | 2020-06-23 | 中国联合工程有限公司 | Kitchen waste pretreatment device and pretreatment method |
| WO2020232996A1 (en) * | 2019-05-21 | 2020-11-26 | 北京高能时代环境技术股份有限公司 | Pretreatment process and apparatus for sorting organic matter of kitchen waste |
| CN111992566A (en) * | 2020-07-08 | 2020-11-27 | 东莞市东实新能源有限公司 | Kitchen waste treatment method |
| CN112209577A (en) * | 2020-10-30 | 2021-01-12 | 芜湖海螺投资有限公司 | Kitchen wastewater treatment method |
| CN112658019A (en) * | 2021-01-22 | 2021-04-16 | 浙江师范大学 | Pretreatment method of kitchen waste |
| CN215998036U (en) * | 2021-07-26 | 2022-03-11 | 中国环境保护集团有限公司 | Kitchen waste treatment system |
-
2021
- 2021-07-26 CN CN202110846356.7A patent/CN113458124B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102950137A (en) * | 2011-08-19 | 2013-03-06 | 光大环保科技发展（北京）有限公司 | Kitchen waste collaborative processing method |
| CN203803586U (en) * | 2014-04-14 | 2014-09-03 | 瑞科际再生能源股份有限公司 | Kitchen waste pulping device |
| CN205288592U (en) * | 2015-11-19 | 2016-06-08 | 北京京城环保股份有限公司 | Homogenate preprocessing device is selected separately in slurrying in kitchen garbage anaerobic fermentation technology |
| CN105925361A (en) * | 2016-04-13 | 2016-09-07 | 江苏维尔利环保科技股份有限公司 | Pretreatment method of anaerobic digestion treatment of kitchen garbage |
| CN205926564U (en) * | 2016-07-29 | 2017-02-08 | 上海浦东环保发展有限公司 | A complete sets that is used for kitchen garbage preliminary treatment edulcoration, proposes oil and slurrying |
| CN108097401A (en) * | 2018-02-08 | 2018-06-01 | 广东瀚蓝生物环保科技有限公司 | A kind of executive device, size degradation pulp all-in-one machine and kitchen garbage processing system |
| CN109513722A (en) * | 2018-10-23 | 2019-03-26 | 东莞理工学院 | A kind of restaurant garbage treating system and processing method |
| WO2020232996A1 (en) * | 2019-05-21 | 2020-11-26 | 北京高能时代环境技术股份有限公司 | Pretreatment process and apparatus for sorting organic matter of kitchen waste |
| CN110343726A (en) * | 2019-06-04 | 2019-10-18 | 无锡市政设计研究院有限公司 | A kind of cooperative processing method of food garbage and rubbish from cooking |
| CN110976472A (en) * | 2019-11-14 | 2020-04-10 | 武汉龙净环保工程有限公司 | Kitchen waste and household waste co-processing method |
| CN111099781A (en) * | 2019-12-31 | 2020-05-05 | 北京嘉博文生物科技有限公司 | Pretreatment device and method for kitchen waste leachate |
| CN111318552A (en) * | 2020-03-30 | 2020-06-23 | 中国联合工程有限公司 | Kitchen waste pretreatment device and pretreatment method |
| CN111992566A (en) * | 2020-07-08 | 2020-11-27 | 东莞市东实新能源有限公司 | Kitchen waste treatment method |
| CN112209577A (en) * | 2020-10-30 | 2021-01-12 | 芜湖海螺投资有限公司 | Kitchen wastewater treatment method |
| CN112658019A (en) * | 2021-01-22 | 2021-04-16 | 浙江师范大学 | Pretreatment method of kitchen waste |
| CN215998036U (en) * | 2021-07-26 | 2022-03-11 | 中国环境保护集团有限公司 | Kitchen waste treatment system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113458124A (en) | 2021-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113458124B (en) | Kitchen waste treatment system and method | |
| CN110343726A (en) | A kind of cooperative processing method of food garbage and rubbish from cooking | |
| EP3429701B1 (en) | Solid waste processing with pyrolysis of cellulosic waste | |
| JP3755982B2 (en) | Recycling method of organic waste | |
| JP5574398B2 (en) | Method and system for methane fermentation of organic solid waste | |
| JP4642203B2 (en) | Organic waste treatment methods | |
| CN113714260A (en) | Kitchen waste sand and oil removing pretreatment method and device | |
| CN114850170A (en) | Kitchen garbage resource and energy recovery pollution-reducing carbon-reducing cooperative device | |
| CN112851051A (en) | Method for treating solid-liquid separation leachate of dining table residues | |
| CN215998036U (en) | Kitchen waste treatment system | |
| CN215998029U (en) | Kitchen waste treatment system | |
| JPH11197636A (en) | Method for treatment of organic waste | |
| CN113441531B (en) | Kitchen waste pretreatment system and method | |
| CN215998027U (en) | Kitchen garbage pretreatment system | |
| CN215998028U (en) | Kitchen waste pretreatment system | |
| JPH11300323A (en) | Treatment of organic waste | |
| CN113458125B (en) | Kitchen waste treatment system and method | |
| JP4537282B2 (en) | Sludge treatment equipment and sludge treatment method | |
| CN114505334B (en) | Kitchen waste treatment process method | |
| JPH11319782A (en) | Methane fermentation process | |
| KR101972903B1 (en) | Food waste treatment system using eco-friendly low temperature evaporation vacuum drying method | |
| JP2006224090A (en) | Methane fermentation system | |
| KR20090026843A (en) | The equipment and method of foodwaste digestion and bio-gas production using uasb | |
| CN113458123B (en) | Kitchen waste pretreatment system and method | |
| JPH11197639A (en) | Treatment of organic waste |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |