CN103739173A - Kitchen wastewater treatment method - Google Patents
Kitchen wastewater treatment method Download PDFInfo
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- CN103739173A CN103739173A CN201410045967.1A CN201410045967A CN103739173A CN 103739173 A CN103739173 A CN 103739173A CN 201410045967 A CN201410045967 A CN 201410045967A CN 103739173 A CN103739173 A CN 103739173A
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Abstract
The invention discloses a kitchen wastewater treatment method which comprises the following steps: 1, chemical phosphorus removal is performed on kitchen wastewater flowing out from an IC (internal circulation) reactor; 2, after passing through a water quality equalization tank, the wastewater enters a CASS (Cyclic Activated Sludge System) to react, so that soluble substrates, organisms, phosphorus and an synchronous nitrification and denitrification effect are removed; 3, after the wastewater flows into an intermediate water tank to be subjected to volume regulation, the wastewater enters a Fenton oxidation reactor and an iron-carbon micro-electrolysis device so as to improve biodegradability of the wastewater; 4, after passing through the Fenton oxidation reactor and the iron-carbon micro-electrolysis device, the wastewater directly enters a hydrolysis acidification pool from the intermediate water tank, suspended matter and iron ions are removed and sludge is separated, hydrolyzed and acidified; 5, the wastewater is subjected to aerated oxidation to remove COD (Chemical Oxygen Demand) content; 6, the wastewater enters an MBR (Meane Biological Reactor) pool and hardly degradable substances are degraded, so that the drained wastewater reaches the take-over standard of a sewage treatment plant; 7, after the sludge discharged from a chemical phosphorus removal pool and the MBR pool is processed by a precision solid-liquid separator, solids are prepared into an organic fertilizer and filter-pressing liquid enters the water quality equalization tank.
Description
Technical field
The present invention relates to a kind for the treatment of process of kitchen waste water.
Background technology
Along with socioeconomic development, the quantity in restaurant, hotel, hotel and dining room is increasing, scale expanding day, the food and drink waste water amount thereupon producing is increasing, according to incompletely statistics, the undressed waste water of the annual catering trade discharge of China reaches more than one hundred million tons, and presents ever-increasing trend.According to another document announcement, food and drink waste water quantity discharged accounts for 3% of city domestic sewage quantity discharged, but its BOD
5and COD
crcontent but account for 1/3 of total load.Visible food and drink waste water is high density pollution source, is the contaminated one of the main reasons of peri-urban water body.Kitchen waste water is due to its complicated component simultaneously, and the feature that organic content is high, biochemical is poor, saltiness is higher, is used common biochemistry to be difficult to the organic composition in waste water and ammonia nitrogen degradation, processes a great problem that becomes up to standard.But the further investigation to changing food waste along with scientific and technological development and people, to changing food waste carry out minimizing, innoxious, resource utilization becomes current important development direction both domestic and external.
At present, both at home and abroad the processing of changing food waste is mainly divided into two kinds of dry slaking and WET DIGESTION, the Method of Food Wastes Disposal in this programme adopts wet type anaerobic digestion.Changing food waste through anaerobic digestion becomes natural pond liquid, and the main purpose of this programme is just for the natural pond liquid processing after anaerobic digestion.According to data at home and abroad investigation, the anaerobic digestion of changing food waste wet type has organism high density, biochemical is poor, grease, suspended substance, saltiness and chloride ion content high.
It is as follows that kitchen waste water is processed front water-quality guideline:
| Project | Content (mg/L) | Project | Content (mg/L) |
| COD cr | 8000～15000 | Ammonia nitrogen | 250～400 |
| BOD 5 | 500～1500 | Suspended substance | 1000～2000 |
| pH | 6～9 | Colourity | 3000～6000 |
| Total phosphorus | 100～500 | Total nitrogen | 700 |
| Chlorion | 1000～3500 | ? | ? |
This compared with national sewage comprehensive emission standard (GB8978-1996) (table 1), total phosphorus in food and drink waste water, BOD
5, COD
cr, SS etc. will be far above grade III Standard, and food and drink waste water, entering before the urban pipe network of sewage work, should be administered and reach grade III Standard.At present, anaerobism and the aerobic biochemical processing process combining that such high concentrated organic wastewater adopts conventionally, wherein anaerobic treatment process mainly contains UASB, IC, EGSB etc., aerobic treatment technique has activated sludge process, biological contact oxidation process, A2/O, A/O, HCR, SBR and development technique, but, no matter be that anaerobism or aerobic treatment technique all must arrange effective pre-treatment before it, as improper in the pre-treatment design of anaerobism or without pre-treatment, the voltaile fatty acid of anaerobic reactor inside (VFA) will be difficult to control so, be in operation and must cause becoming sour of whole anaerobic reactor, otherwise, effectively pre-treatment can be controlled the VFA in anaerobic reactor, the convenient potential of hydrogen of controlling in reactor, temperature and pH value, thereby make wastewater treatment up to standard.Therefore, finding a kind of effective method has important practical significance the governance for reaching standard discharge of food and drink waste water.
Summary of the invention
The object of the invention is the kitchen waste water treatment process for a kind of effective reduction SS, ammonia nitrogen, COD, total phosphorus are provided, make waste discharge reach sewage work and take over mark Huaihe River.Technical scheme of the present invention is: kitchen waste water treatment process comprises the following steps:
(1) chemical dephosphorization: by IC reactor (anaerobic reactor) kitchen waste water out, the dephosphorization agent that adds 500-1000ppm carries out chemical dephosphorization precipitation 30-90 minute, to remove more than 90% phosphorus and COD and the ammonia nitrogen of small portion.
(2) water quality evenly and CASS reaction: because the water outlet after chemical dephosphorization is certain period water outlet, need behind the even pond of water quality, make current evenly enter CASS reactor.CASS reactor is comprised of Two Areas, i.e. biological selecting area (pre-reaction zone) and main reaction region.Biological selecting area adds microbial strains to react 30-60 minute under anaerobism or double oxygen condition, removes solvability substrate and further dephosphorization.Main reaction region is divided water inlet, aeration, is precipitated, strains water and idle, and the time is respectively 2-8 hour, makes organism that degraded and simultaneous nitrification and denitrification effect occur.The part of contaminated water of CASS reactor is back to again the even pond of water quality.
(3) biodegradability of raising waste water: waste water flows into intermediate pool after CASS biochemical treatment to carry out after volume adjustment, enters Fenton oxidation reactor and iron-carbon micro-electrolysis device.Fenton oxidation reactor is by acid adding, ferrous iron and hydrogen peroxide, is oxidized, and iron-carbon micro-electrolysis device is by adding iron powder and carbon dust to carry out micro-electrolysis, and waste water is respectively 15-30 minute, 60-90 minute in the reaction times of above two processing units.Both objects are the biodegradability energy in order to change waste water.
(4) acidication: waste water is after Fenton oxidation reactor and iron-carbon micro-electrolysis device or directly enter hydrolysis acidification pool.In the situation that operation debugging biodegradability is good, can short distance be set at Fenton and iron-carbon micro-electrolysis processing unit place and surmount pipe, directly from intermediate pool, enter hydrolysis acidification pool.Hydrolysis acidification pool is divided into two settling tanks, and front end is flocculation sediment 1-6 hour, removes suspended substance and iron ion that Fenton and iron-carbon micro-electrolysis produce; Rear end is natural sedimentation 1-6 hour, separates hydrolysis acidification sludge, sludge reflux is guaranteed to the treatment effect of hydrolysis acidification pool to hydrolytic tank front end.Diving mixer is set in hydrolysis acidification pool, guarantees that acidication mud fully contacts with waste water, mud is always in fluidized suspension state.
(5) aeration oxidation: enter contact-oxidation pool after hydrolysis acidification pool, carry out aeration aerobic reaction and reduce COD content, aeration time is 5-10 hour.
(6) MBR pond: finally enter membrane biological reaction pond (MBR), utilize membrane separation plant that the active sludge in biochemical reaction tank and larger molecular organics matter are held back, the material of difficult degradation is constantly reacted in reactor, degrade.
(7) fertilizer processed: from chemical dephosphorization pond and MBR pond mud out, enter sludge sump, by accurate solid-liquid separating machine, isolated solid carries out piling fermentation fertilizer processed, and isolated liquid enters the even pond of water quality again.
Feature of the present invention is to select two-stage aerobic, and between two-stage aerobic is processed, the secondary anaerobic that improves wastewater biodegradability is set again---acidication processing unit and MBR pond.
1. the CASS pond of one-level aerobic treatment: the whole technique of CASS is a batch reactor, it is the one renewal modification of SBR technique and ICEAS technique.Cyclic activated sludge system is owing to a) having good Nitrogen/Phosphorus Removal.B) biological selector also can suppress hyphomycetic amount reproduction effectively, overcomes sludge bulking, improves the stability of system.C) main reaction region is moved in the mode of mixing completely, and water treatment is effective.D) structures are few, and reduced investment is taken up an area less, and equipment is few, and maintenance mode just.Do not establish second pond, technical process is simple.E) aeration time is short, efficiency is high.H) advantage easy and simple to handle, level of automation is high, especially excellent denitrogenation dephosphorizing function and more and more being paid attention to.
2. the aerobic contact-oxidation pool of secondary: biological contact oxidation process be the microbial film being attached on carrier (being commonly called as filler) be main, a kind of High-efficient Water treatment process of purification of organic waste water.There is the biomembrance process of activated sludge process feature, have the advantage of activated sludge process and biomembrance process concurrently.The features such as purification efficiency is high, the treatment time is short, floor space is little because having for this technique, anti impulsion load, operational management convenience are widely used.
3.MBR pond: membrane bioreactor (MBR pond) is by the new and effective sewage treatment process of one of Modern Membrane Technology and the combination of traditional biological treatment technology.MBR technique major advantage is: 1. effluent quality good stable 2. excess sludge production 3. floor space is little less, occasion restriction is not set and 4. can be removed 5. convenient operation and management of ammonia nitrogen and hard-degraded substance, easily be automated.The present invention, owing to adopting above-mentioned treatment process, can effectively reduce COD content, suspension content, ammonia-nitrogen content and total phosphorous, makes waste discharge reach sewage work and takes over mark Huaihe River.
Accompanying drawing explanation
Fig. 1 is the process schematic representation of the inventive method.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
(1) step 1, chemical dephosphorization: by IC reactor kitchen waste water out, the dephosphorization agent that adds 500-1000ppm carries out chemical dephosphorization precipitation 30-90 minute, as adds the dephosphorization agent of 1000ppm to carry out chemical precipitation 30 minutes.(2) step 2, water quality are evenly and CASS reaction: behind the even pond of water quality, make current evenly enter CASS reactor the water outlet after chemical dephosphorization.Biological selecting area at CASS reactor is reacted 30-60 minute with microbial strains under anaerobism or double oxygen condition, removes solvability substrate and further dephosphorization.Again to the main reaction region of CASS reactor successively water inlet, aeration, precipitate, strain water and idle, the time is respectively 2-8 hour, makes organism that degraded and simultaneous nitrification and denitrification effect occur.The part of contaminated water of CASS reactor is back to again the even pond of water quality.Biological selecting area forms dynamic (dynamical) rule according to active sludge population and arranges, enter the sewage of reactor and the active sludge of main reactor internal reflux mutually mixes and contacts in biological selecting area, take full advantage of the quick adsorption effect of active sludge and accelerate the removal to solvability substrate, can make the phosphorus in mud under anaerobic effectively be discharged simultaneously.In addition, in selection district, can effectively control hyphomycetic breeding, thereby can reduce the foam that Aerobic Pond aeration produces.Main reaction region is moved in the mode of mixing completely, in operational process, conventionally dissolved oxygen intensity in the aeration intensity of control main reaction region and aeration tank, so that in reaction zone in main body solution in good oxygen condition, it is nitrated that the outside of assurance mud flco has an aerobic environment to carry out, and active sludge inside configuration is substantially in anoxic condition, and dissolved oxygen is restricted to the transmission in mud flco, higher nitrate concentration can be penetrated into flco inside preferably, effectively carries out denitrification.(3) biodegradability of step 3, raising waste water: waste water flows into intermediate pool through CASS reactor to carry out after volume adjustment, enters Fenton oxidation reactor and iron-carbon micro-electrolysis device.Fenton oxidation reactor is by acid adding, ferrous iron and hydrogen peroxide, is oxidized, and iron-carbon micro-electrolysis device, by adding iron powder and carbon dust to carry out micro-electrolysis, improves the biodegradability energy of waste water.Waste water is respectively 15-30 minute, 60-90 minute in the reaction times of above two processing units.(4) step 4, acidication: waste water, after Fenton oxidation reactor and iron-carbon micro-electrolysis device or in the situation that operation debugging biodegradability is good, directly enters hydrolysis acidification pool from intermediate pool.Hydrolysis acidification pool is divided into two settling tanks, and front end is flocculation sediment 1-6 hour, removes suspended substance and iron ion that Fenton and iron-carbon micro-electrolysis produce; Rear end is natural sedimentation 1-6 hour, separates hydrolysis acidification sludge.(5) step 5, aeration oxidation: enter contact-oxidation pool after hydrolysis acidification pool, carry out aeration aerobic reaction and reduce COD content, aeration time is 5-10 hour.(6) step 6, MBR pond: finally enter membrane biological reaction pond (MBR), utilize membrane separation plant that the active sludge in biochemical reaction tank and larger molecular organics matter are held back, saved second pond, therefore activated sludge concentration improves greatly, hydraulic detention time (HRT) and sludge retention time (SRT) can be controlled respectively, the material of difficult degradation is constantly reacted in reactor, degrade.In membrane bioreactor, the membrane module being comprised of hollow-fibre membrane soaks in aerobic aeration district, because the aperture of 0.03 micron of hollow-fibre membrane can stop passing through of bacterium completely, so zoogloea and free bacteria are all retained in aeration tank, only by crossing in the water remittance header filtering, discharge, thereby reach mud-water separation, exempted second pond.Various suspended particles, bacterium, algae, turbidity and COD and organism are all effectively removed, and have guaranteed water suspension and have approached zero good effluent quality.(7) step 7, fertilizer processed: from chemical dephosphorization pond and MBR pond mud out, enter sludge sump, by accurate solid-liquid separating machine, isolated solid carries out piling fermentation fertilizer processed, and isolated liquid enters the even pond of water quality again.
Through above-mentioned steps, and COD content, ammonia-nitrogen content, total phosphorous and the SS content of each step water inlet and water outlet are detected, according to the mean value of 10 different time sections, can table 1.
The each step removal efficiency of table 1 table (unit: mg/L)
From table 1, kitchen waste water is through above-mentioned treatment process, COD content has declined 98.3%, ammonia-nitrogen content has declined 93.25%, and total phosphorous 99.4%, the SS content that declined has declined 96.5%, reach sewage work and take over mark Huaihe River, in Table 2, from domestic pollution source, cut off the direct discharge of this eutrophic wastewater of kitchen waste water, guaranteed water body and underground water avoid pollute.
Table 2 sewage work takes over standard
| Project | Content (mg/L) | Project | Content (mg/L) |
| COD cr | <300 | Total phosphorus | <4.5 |
| SS | <200 | Ammonia nitrogen | <31 |
Kitchen waste water treatment process of the present invention adopt secondary aerobic+acidication+MBR pond method, can be to kitchen waste water purification of water quality, process stabilizing, be applicable to food processing plant, changing food waste centralized treatment plant etc., COD content, ammonia-nitrogen content, total phosphorous and SS content are all had to good removal effect, eliminated the water pollution that direct discharge brings.Although the disclosed treatment process that relates to a kind of kitchen waste water has been carried out to special description with reference to example, embodiment described above is illustrative and not restrictive, without departing from the spirit and scope of the present invention, thus variation and revise all within the scope of the present invention.
Claims (5)
1. a kitchen waste water treatment process, it is characterized in that, comprise two paths after chemical dephosphorization settling tank after IC reactor, article one, for liquid enters the even pond of the water quality connecting successively by pipeline, CASS pond, intermediate pool, Fenton oxidation reactor, iron-carbon micro-electrolysis device, hydrolysis acidification pool, contact-oxidation pool and MBR pond, another enters after settling tank by accurate solid-liquid separating machine for throw out, the solid separating carries out piling fermentation fertilizer processed, the pressing filtering liquid of described accurate solid-liquid separating machine and the sewage backflow of CASS are to entering the even pond of water quality, described intermediate pool setting surmounts pipe, can be directly to hydrolysis acidification pool, the mud in described MBR pond enters sludge sump, the dephosphorization agent that adds 500-1000ppm in described chemical dephosphorization settling tank carries out chemical dephosphorization precipitation 30-90 minute, to remove more than 90% phosphorus and COD and the ammonia nitrogen of small portion, described CASS reactor is comprised of Two Areas, be biological selecting area (pre-reaction zone) and main reaction region, biological selecting area adds microbial strains to react 30-60 minute under anaerobism or double oxygen condition, remove solvability substrate and further dephosphorization, water inlet is divided in main reaction region, aeration, precipitation, strain water and idle, time is respectively 2-8 hour, make organism that degraded and simultaneous nitrification and denitrification effect occur, described Fenton oxidation reactor is to pass through acid adding, ferrous iron and hydrogen peroxide, be oxidized, reaction times is 15-30 minute, described iron-carbon micro-electrolysis device is by adding iron powder and carbon dust to carry out micro-electrolysis, reaction times is 60-90 minute, described hydrolysis acidification pool is divided into two settling tanks, front end is flocculation sediment 1-6 hour, remove suspended substance and iron ion that Fenton and iron-carbon micro-electrolysis produce, rear end is natural sedimentation 1-6 hour, separate hydrolysis acidification sludge, sludge reflux is guaranteed to the treatment effect of hydrolysis acidification pool to hydrolytic tank front end, diving mixer is set in hydrolysis acidification pool, guarantee that acidication mud fully contacts with waste water, mud is always in fluidized suspension state, described contact-oxidation pool, and aeration 5-10 hour reduces COD content.
2. a kind of kitchen waste water treatment process according to claim 1, is characterized in that: it is to carry out volume adjustment that waste water flows into intermediate pool after CASS biochemical treatment.
3. a kind of kitchen waste water treatment process according to claim 1, is characterized in that: waste water enters Fenton oxidation reactor and iron-carbon micro-electrolysis device is the biodegradability energy in order to change waste water.
4. a kind of kitchen waste water treatment process according to claim 1, is characterized in that: short distance is set, and to surmount pipe be that waste water directly enters hydrolysis acidification pool from intermediate pool in the situation that operation debugging biodegradability is good.
5. a kind of kitchen waste water treatment process according to claim 1, it is characterized in that: membrane biological reaction pond (MBR) utilizes membrane separation plant that the active sludge in biochemical reaction tank and larger molecular organics matter are held back, and the material of difficult degradation constantly reacted in reactor, degrade.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104003573A (en) * | 2014-05-20 | 2014-08-27 | 苏州市众和固体废物回收处理有限公司 | Treatment system and treatment method of organic waste water |
| CN106477829A (en) * | 2016-12-23 | 2017-03-08 | 山东鑫中鑫无害化设备制造有限公司 | The innoxious Waste Water Treatment of spoil and method of wastewater treatment |
| CN106495411A (en) * | 2016-12-09 | 2017-03-15 | 南京大善环境科技有限公司 | Wastewater treatment ICBB technique and device in Ginkgo Biloba Extract extraction process |
| CN106746174A (en) * | 2016-11-21 | 2017-05-31 | 中机国际工程设计研究院有限责任公司 | A kind of kitchen garbage slurry anaerobic fermentation method of wastewater treatment |
| CN109467266A (en) * | 2018-11-29 | 2019-03-15 | 长沙凯天工研院环保服务有限公司 | A kind of changing food waste into resources treatment process |
| CN111762961A (en) * | 2020-06-19 | 2020-10-13 | 苏州市双利环保工程有限公司 | Kitchen wastewater treatment method |
| CN112441703A (en) * | 2020-11-19 | 2021-03-05 | 天津中滨远大环境科技有限公司 | Middle and small kitchen waste leachate treatment process |
| CN112495982A (en) * | 2020-10-22 | 2021-03-16 | 湖北君集水处理有限公司 | Method for converting kitchen waste into wastewater denitrification carbon source through catalytic wet oxidation |
| CN113307668A (en) * | 2021-06-18 | 2021-08-27 | 安徽国祯环卫科技有限公司 | New method for composting and fermenting kitchen waste |
| CN113636718A (en) * | 2021-08-06 | 2021-11-12 | 广东汇祥环境科技有限公司 | Improved sewage treatment composite process |
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Cited By (13)
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|---|---|---|---|---|
| CN104003573A (en) * | 2014-05-20 | 2014-08-27 | 苏州市众和固体废物回收处理有限公司 | Treatment system and treatment method of organic waste water |
| CN106746174A (en) * | 2016-11-21 | 2017-05-31 | 中机国际工程设计研究院有限责任公司 | A kind of kitchen garbage slurry anaerobic fermentation method of wastewater treatment |
| CN106495411A (en) * | 2016-12-09 | 2017-03-15 | 南京大善环境科技有限公司 | Wastewater treatment ICBB technique and device in Ginkgo Biloba Extract extraction process |
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| CN109467266A (en) * | 2018-11-29 | 2019-03-15 | 长沙凯天工研院环保服务有限公司 | A kind of changing food waste into resources treatment process |
| CN111762961A (en) * | 2020-06-19 | 2020-10-13 | 苏州市双利环保工程有限公司 | Kitchen wastewater treatment method |
| CN112495982A (en) * | 2020-10-22 | 2021-03-16 | 湖北君集水处理有限公司 | Method for converting kitchen waste into wastewater denitrification carbon source through catalytic wet oxidation |
| CN112441703A (en) * | 2020-11-19 | 2021-03-05 | 天津中滨远大环境科技有限公司 | Middle and small kitchen waste leachate treatment process |
| CN113307668A (en) * | 2021-06-18 | 2021-08-27 | 安徽国祯环卫科技有限公司 | New method for composting and fermenting kitchen waste |
| CN113636718A (en) * | 2021-08-06 | 2021-11-12 | 广东汇祥环境科技有限公司 | Improved sewage treatment composite process |
| CN115231780A (en) * | 2021-08-06 | 2022-10-25 | 广东汇祥环境科技有限公司 | Efficient nitrogen and phosphorus removal sewage treatment system and method |
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Application publication date: 20140423 |