CN101643301A - Method for purifying oil-containing waste water of catering and complete equipment thereof - Google Patents
Method for purifying oil-containing waste water of catering and complete equipment thereof Download PDFInfo
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- CN101643301A CN101643301A CN200910195696A CN200910195696A CN101643301A CN 101643301 A CN101643301 A CN 101643301A CN 200910195696 A CN200910195696 A CN 200910195696A CN 200910195696 A CN200910195696 A CN 200910195696A CN 101643301 A CN101643301 A CN 101643301A
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Abstract
The invention belongs to the technical field of water processing, and in particular relates to a method for purifying oil-containing waste water of catering and complete equipment thereof. The methodcomprises the following steps: mechanical-type oil-dirt separation, coagulation treatment of suspended substances, air floatation biochemical treatment, and biological filtration and sterilization. Compared with the prior art, the method of the invention has the characteristics of high removal efficiency, simple equipment, low running cost, convenient operation, management and maintenance, and caneffectively remove large amount of organic substances and grease in the waste water, the mmonian and chroma of the waste water, and the like, and enables every outlet water index to satisfy the requirement of recycle water.
Description
Technical field
The invention belongs to water-treatment technology field, be specifically related to a kind of method for purifying oil-containing waste water of catering and suite of equipment.
Background technology
In recent years, China's catering trade is flourish, and the proportion of whole industry in national economy rapidly rises to annual revenue and exceeds 100 billion, and has grown into the very important important force of China's Economic development.Yet along with city and development of urbanization, the scale in hotel, hotel, dining room enlarges day by day, and quantity is increasing, the food and drink waste water amount of Chan Shenging is increasing thereupon, according to incompletely statistics, the undressed waste water of the annual catering trade discharging of China reaches more than one hundred million tons, and ever-increasing trend is arranged.According to another document announcement, the food and drink waste water quantity discharged accounts for 3% of city domestic sewage quantity discharged, but its BOD
5But account for 1/3 of total load with the content of COD, visible food and drink waste water is the high density pollution source, is the contaminated one of the main reasons of peri-urban water body.Class seasoning matter, washing composition and protein or the like pollutent.Such waste water has COD
CrAnd BOD
5Value is high, and oleaginousness is big, and certain colourity and smell are arranged, and water quality and quantity changes the characteristics that wait greatly, these organism also can go bad when temperature is high as not treated and after being discharged into rivers,lakes and seas, can make the water body muddiness, make the water blackening in the rivers and lakes, and send foul odour, have a strong impact on environment.The bacterium of waste water can become the transmission of disease source, brings serious threat for people's physical and mental health.If undressed oil-containing waste water of catering is used for agricultural irrigation, then can stop up interstices of soil, hinder crop growth.Along with the raising of urban environmental management level and the strictness of emission standard, to reach sewage row people municipal sewage system water quality standard before the food and drink waste water discharging, exceed standard fine and move away from intown danger otherwise face.Therefore, the discharging of the governance for reaching standard of food and drink waste water has important practical significance.
According to being 200～400mg/L to oil-containing waste water of catering detected result table: BODs such as Guangzhou, China developed regions, Shanghai, CODcr is 400～800mg/L at present, and SS is 250～500mg/L, and grease is 150-420mg/L, and ammonia nitrogen mean value is 6～50mg/L.The management task of oil-containing waste water of catering mainly is to remove grease, organism, ammonia nitrogen and suspended substance.
In the prior art; at oil-containing waste water of catering multiple treatment process is arranged; mainly contain physics method (sedimentation, machinery, centrifugal, coarse, filtration, membrane sepn etc.); physico-chemical processes (flotation, absorption, ion-exchange, electrolysis etc.), chemical method (cohesion, acidifying, saltout etc.) and biological process (active sludge, biomembrance process etc.) etc.The treatment process of existing several main oil-containing waste water of catering is specific as follows:
1) gravity oil removal partition method:
Gravity oil removal partition method is to utilize profit biphase density difference and oil to separate with the not mutual solubility of water.This class methods device structure is simple, easy to operate, and deoiling effect is stable.Oily-water seperating equipment based on the gravity separation principle is of a great variety, and main products has API type oil-water separation tank (parallel flow intercepter), PPI type oil-water separation tank, CPI type oil-water separation tank etc.
This method mainly is applicable to oil slick and emulsification dispersed oil, but can't remove oil in water emulsion, and is relatively poor to the removal effect of organism and ammonia nitrogen, is difficult to reach emission standard, needs follow-up further processing.
2) coarse method:
Coarse method (coalescent method) is to utilize the difference of profit two relative coalescence material avidity to separate, and is mainly used in the dispersion oil handling.The key problem in technology of this method is the selection of coarse material; the lipophilic-hydrophobic property of material surface is main; coarse method oil-containing waste water of catering can effectively reduce the oleaginousness of oil-containing waste water of catering, but the oil-containing waste water of catering high to concentration of suspension, coalescence material easily stops up.
3) Coagulation Method
Coacervation is to point in the waste water to add flocculation agent, utilizes the bridging action of agglutinating matter, makes the particulate oil droplet be combined into polymer.Oil in the oil-containing waste water of catering, it is fully hydrophobic to say so by its surface properties, and density is littler than water, it stands to reason that to inhale poly-ly mutually, annexs bigger oil droplet, borrows its density difference to float to the water surface on voluntarily.Effect such as catch by neutralization, absorption-bridge formation and precipitating thing net, to reach the ideal coagulation effect.
Have with the Coagulation with Treatment oil-containing waste water of catering that flow process is short, equipment simple, the characteristics of floor space, oil-containing waste water of catering qualitative change variation range is big, though after coagulating treatment, the COD clearance is higher, and the ammonia nitrogen removal effect is relatively poor.
4) membrane filter method
It is to grow up nearly decades that membrane separation process is handled oil-containing waste water of catering, mainly contains micro-filtration (MF), nanofiltration (NF), ultrafiltration (UF) and reverse osmosis (RO) method.Membrane separation process is suitable for removing stable oil in water emulsion and the dispersed oil in the waste water, when pre-treatment, need remove bigger oil in water emulsion and the dispersed oil of particle in anhydrating, advantage such as it has need not add other reagent, do not produce oily sludge, concentrated solution can burn, processing, cost of equipment are low.The problem that it exists is that treatment capacity is less, need waste water is carried out strict pre-treatment, and the cleaning of film also bothers.
5) electrochemical process
Electrochemical process is to utilize electric current to carry out the process of solution oxide reduction reaction, and pollutants in waste water matter is oxidized at anode, after cathodic reduction, or with the effect of electrode reaction product, change into harmless composition, reach the purpose of purifying waste water.The method of normal employing has the electrolytic flocculation method, technologies such as pulse electro-flocculation method in oil-containing waste water of catering is handled.Handle oil-containing waste water of catering with electrochemical process, higher, simple to operate to organic removal efficient, but power consumption is big, the easy loss of pole plate, and with the increase of waste strength, current consumption also can obviously increase, and equipment is also had certain corrosion harmfulness.
6) biological treatment
Biological treatment is a kind of method of utilizing the biological oxidation of microorganism that waste water is purified.Biological process processing efficiency height, capacity of resisting impact load is strong, technology maturation, the biological process that is applied in the oil-containing waste water of catering process field mainly contains SBR method (Sequencing Batch Reactor, be called for short SBR, sequencing batch active sludge), contact oxidation method, MBR method (membrane bioreactor is called for short MBR, the membrane bioreactor method) etc.Though these methods are better to the organism effect, floor space is bigger, cost of investment height, working cost height.
In sum, in existing oil-containing waste water of catering treatment process.Flow process is short though physics method, physico-chemical processes, chemical method have, the simple advantage of facility, and processing efficiency is not high; And when the influent quality acute variation, effluent quality also has fluctuation, and therefore general physico-chemical process also will carry out advanced treatment ability qualified discharge thereafter only as pre-treatment; Biological treatment possesses advantages such as processing efficiency height, capacity of resisting impact load are strong, but because its floor space is bigger, the working cost height is difficult to promote the use of in the catering trade of city.Make a general survey of existing various oil-containing waste water of catering treatment process, have problem more or less respectively at aspects such as economy, energy consumption and treatment effects.And how can simplify the sewage disposal step, and reach high processing efficient, be those skilled in the art institute problem demanding prompt solution.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of method for purifying oil-containing waste water of catering and suite of equipment are provided.
To achieve these goals, the present invention adopts following technical scheme:
1) the mechanical type greasy dirt separates: oil-containing waste water of catering enters oil trap then and carries out the separation of mechanical type greasy dirt by suspended substance and impurity in the grid removal oily(waste)water;
2) suspended substance coagulating treatment: the water outlet after the mechanical type greasy dirt separates enters reaction tank, adds coagulating agent in reaction tank, carries out coagulating and handles;
3) air supporting biochemical treatment: the water outlet after coagulating is handled enters the air supporting biochemistry pool and carries out solid-liquid separation processing and biochemical treatment;
4) biofiltration: solid-liquid separation handle and biochemical treatment after water outlet enter the Improvement type biological filter and carry out Microbial denitrogenation and carbon removal treatment, the water outlet after using biofilter material to Microbial denitrogenation and carbon removal treatment is then filtered;
5) sterilization and disinfection: use sterilizing agent that sterilization and disinfection is carried out in the water outlet after filtering and handle.
In the described step 1), the greasy dirt after the separation can with separate scraper plate and separate and collect.
Preferably, the coagulating agent described step 2) is selected from one or more in polymerize aluminum chloride or the polyaluminium sulfate.
Preferably, described step 2) the throwing amount of coagulating agent is 20～50mg/L in, and the time of the coagulating treatment in reaction tank is 5～10min.
Air supporting biochemistry pool in the described step 3) comprises pond body, air-dissolving apparatus, microbial suspension filler and slag scraper, wherein, the surface, pond is provided with slag scraper, and body inside, described pond comprises air supporting contact separation district and biochemical zone, wherein, described air supporting contact separation district is positioned at the upper strata, and available depth is 0.7～1.2m, and surface load is 0.8～2m
3/ m
2H, and be provided with dissolved air release in the described air supporting contact separation district; Described biochemical zone is positioned at lower floor, and available depth is 1～2m, and is provided with the microbial suspension filler in the described biochemical zone.
Preferably, described air-dissolving apparatus is made up of gas-liquid mixing pump and small pressure surge tank.
Preferably, described microbial suspension filler is a microbial membrane carrier, can select commercially available microbial membrane carrier according to institute fixed microorganism by those skilled in the art.
The principle that described solid-liquid separation is handled is: suspended matter that contains in the water outlet after coagulating is handled and the micro-bubble combination in the dissolved air water, form the medium lighter than water, and bubble through the water column and removed by slag scraper and realize solid-liquid separation.
The principle of described biochemical treatment is: adopt the membrane carrier that is fixed with microorganism as the microbial suspension filler, the fixed microorganism can be decomposed the organism in the water in the microbial suspension filler.
Preferably, the microorganism in the described step 4) comprises nitrobacteria and denitrifying bacterium.
Preferably, the mass percent of the moiety of the biofilter material in the described step 4) and each component is: quartz sand 10～30%; Gac 30～60%; Zeolite molecular sieve 20～40%.
Preferably, in the described step 4), adopt the recoil water pump back flushing to be carried out in the Improvement type biological filter, back washing strength 2～5L/S.m
2, flushing cycle is: 24～72h, counter-flushing liquid enters in the grating tank.
Preferably, in the described step 5), sterilizing agent is C1O
2, working concentration is 1～10mg/L.
The present invention also provides a kind of oil-containing waste water of catering purifying treatment suite of equipment that is used for described method, comprises the grating tank, oil trap, reaction tank, air supporting biochemistry pool, Improvement type biological filter and the clean water basin that connect successively.
Preferably, the inside of described grating tank is provided with grid, and a side of grating tank is provided with water inlet pipe, and opposite side is connected with oil trap; The inside of described oil trap is provided with dividing plate, and a side of oil trap is connected with reaction tank; Described reaction tank is connected with the air supporting biochemistry pool by internal pipeline; Bottom one side of described air supporting biochemistry pool is connected with the Improvement type biological filter by the perforate water leg; Bottom one side of Improvement type biological filter is connected with a side of clean water basin, and the opposite side of clean water basin is provided with rising pipe.
Preferably, described reaction tank is provided with the dosing pond, and top, described dosing pond is provided with stirrer.
Preferably, the top of described air supporting biochemistry pool is provided with slag scraper, and its inside is provided with dissolved air release and microbial suspension filler, and the outside also is provided with small-sized force balance jar and gas-liquid mixing pump.
The method of oil-containing waste water of catering purifying treatment of the present invention and recycling has following characteristics:
1, by in reaction tank, carrying out the suspended substance coagulating treatment, can be beneficial to follow-up solid-liquid separation so that most suspended substances in the water body and colloid form flock;
2, owing to used the air-dissolving apparatus of the pressurized dissolved air flotation biochemistry pool of being made up of gas-liquid mixing pump and small pressure surge tank, the gas-liquid mixed pump intake can utilize suction function to suck gas, and the pump impeller of high speed rotating mixes stirring with liquid with gas.Because the pressurization in the pump mixes, gas and liquid fully dissolve, and dissolved efficiency can reach 80～100%, and performance is better than the air-dissolving apparatus be made up of air compressor machine, reflux pump, dissolving in the routine techniques; And the molten gas mode of use gas-liquid mixing pump can improve molten gas-liquid and produce efficient, simplifies device for making, saves space, reduces investment, saves running cost and maintenance cost;
3, the pressurized dissolved air flotation biochemistry pool comprises air supporting contact separation district and biochemical zone: wherein, in the air supporting contact separation district, the suspended matter of sewage and the micro-bubble combination in the dissolved air water form the medium lighter than water, and bubbling through the water column is removed; And biochemical zone microbial suspension filler has adopted the novel microorganism membrane carrier as the microbial suspension filler, this microbial suspension filler has satisfactory stability and physical and chemical performance in sewage, its voidage is more than 90%, support density behind the fixation of microbe approaches water, the load of microorganisms amount is big, up to 18～40g/L, volumetric loading can be up to 10-16kgBOD
5/ m
3.d, specific surface area can reach 200～500m
2/ m
3Simultaneously, because this air supporting biochemistry pool utilizes its inner available depth that the work area is divided into bilevel constructional feature, therefore can make sewage, air and microbial film obtain abundant blending and contact exchange, microbial film can not only be grown in microbe carrier in large quantities, keep good activity and space mutability, and in operational process gas under mobile sewage drives, the microbe carrier that runs foul of each other and be in the state of highly wriggling constantly cuts into littler bubble, has increased the utilization ratio of oxygen.Therefore it has characteristics such as the cutting bubbling ability is strong, the spatial volume utilization ratio is big, no dead band, therefore at biochemical zone, microorganism utilizes the supersaturation dissolved oxygen (dissolved oxygen in the general air supporting water outlet can reach 6-8mg/L) of air supporting water outlet on the microbial suspension filler, as growth and the required oxygen source of decomposing organic matter, reach the purpose of decomposing organic matter;
4, the filtrate of Improvement type biological filter is quartz sand, gac and zeolite molecular sieve, by contrasting with conventional biological filter, carries out wastewater treatment with this filtrate, and its hydraulic load can reach 1.5-3.0m/h, can improve 30% to organism, ammonia-N removal rate.Its cardinal principle is that gac can adsorb colloid in the sewage and dissolved organic matter matter, adsorbed organic matter is utilized with growth and breeding and degraded by microorganism, these microorganisms have further been adsorbed suspended substance and colloid and the dissolved matter in the sewage again simultaneously, thereby form microbial film gradually, the microorganism on the microbial film carries out the adsorption and oxidation effect again to organism in the sewage; And the specific surface area of zeolite molecular sieve is big, very strong ion-exchange capacity is arranged, ammonia nitrogen is had the obligate adsorption, and the nitrification and denitrification bacterium on the logical filtrate of the ammonia nitrogen after being adsorbed is decomposed and is effectively removed, simultaneously by regenerated the again ammonia nitrogen absorption function of zeolite molecular sieve of biological degradation ammonia nitrogen;
5, adopt the recoil water pump that regular back flushing is carried out in the filter tank, can make filtering basin be in efficient treated state.
Simultaneously, compared with prior art, method of the present invention has following outstanding technical characterstic:
1, remove the efficient height,, make organism in the waste water by the reasonable combination of decontamination step, grease, contamination indexs such as ammonia nitrogen can effectively remove, and reclaimed water can directly be discharged or be back to treat effluent;
2, by to the rational deployment of various processes, make that its support equipment floor space is little, compact construction, attractive in appearance, not only can be applicable to take up an area of the restaurant unit of the big and medium-sized cities such as hotel, hotel of space anxiety.Also can be applicable to landscaped area, travel resort away from urban pipe network.Adopt this integration apparatus to handle, can make effluent quality reach discharging standards or reclaimed water reuse standard.Simultaneously can be according to the surrounding landscape specific requirement of project, integration apparatus adopts buried or ground type, and it is coordinated mutually with natural landscape on every side;
3, can effectively remove large amount of organic in the waste water, grease, and can remove ammonia nitrogen in the waste water, colourity etc., make the every index of water outlet can satisfy the reuse water requirement, the water quality of the oil-containing waste water of catering water outlet after the processing can reach " urban wastewater treatment firm pollutant emission standard " one-level A emission standard, and reclaimed water can be directly discharged or be back in water outlet.
Description of drawings
Fig. 1 is the schema of method for purifying oil-containing waste water of catering of the present invention.
Fig. 2 is the structure iron of oil-containing waste water of catering purifying treatment suite of equipment of the present invention.
Fig. 3 is the A-A face sectional view of oil-containing waste water of catering purifying treatment suite of equipment of the present invention.
Fig. 4 is the B-B face sectional view of oil-containing waste water of catering purifying treatment suite of equipment of the present invention.
Embodiment
Further set forth the present invention below in conjunction with embodiment.Should be understood that these embodiment only are used to illustrate the present invention, but not limit the scope of the invention.
Embodiment 1
The oil-containing waste water of catering source of using in the present embodiment is: there is the kitchen waste water of hotel, hotel, dining room, holiday village, landscaped area, residential building in the oil-containing waste water of catering source; The impurity that wherein contains mainly comprises: foodstuff fibre, starch, animal-plant oil, all kinds of seasoning matter, washing composition and protein.
Fig. 1 is the method flow diagram of oil-containing waste water of catering purifying treatment in the present embodiment.
Fig. 2 is the structure iron of oil-containing waste water of catering purifying treatment suite of equipment in the present embodiment, and the suite of equipment of described food and drink waste water treatment process comprises: dosing pond 1, reaction tank 2, air supporting biochemistry pool 3, Improvement type biological filter 4, clean water basin 5, oil trap 6 and grating tank 10; Wherein, the inside of grating tank 10 is provided with grid 13, and a side of grating tank 10 is provided with water inlet pipe 7, and opposite side is connected with oil trap 6; The inside of oil trap 6 is provided with erects first baffle plate 8 and the second baffle of placing 9, and a side of oil trap 6 is connected with reaction tank 2.
The top in dosing pond 1 is provided with stirrer 12; Reaction tank 2 is connected with the internal pipeline that passes through in air supporting life pond 3; Bottom one side of described air supporting biochemistry pool 3 is connected with Improvement type biological filter 4 by the perforate water leg 14 around 3 one weeks of air supporting biochemistry pool; Bottom one side of Improvement type biological filter 4 is connected with a side of clean water basin 5 by perforated panel 15, and the opposite side of clean water basin 5 is provided with rising pipe 16.Simultaneously, the outside of clean water basin is provided with sterilizing unit 22 and recoil water pump 23.
The top of air supporting biochemistry pool 3 is provided with slag scraper 17, and its inside is provided with dissolved air release 18 and microbial suspension filler 19, and the outside also is provided with small pressure surge tank 20 and gas-liquid mixing pump 21.
Be provided with biofilter material 25 in the Improvement type biological filter 4.
When carrying out the processing of oil-containing waste water of catering, oil-containing waste water of catering enters the grating tank 10 from water inlet pipe 7, large granular impurity in the waste water is through grid 13 filterings, and effusive water outlet enters in the oil trap 6 from grating tank 10, carries out the mechanical type greasy dirt through first baffle plate 8 with second baffle 9 and separates.
The water outlet of discharging from oil trap 6 enters in the reaction tank 2, and dosing pond 1 adding coagulating agent in the reaction tank 2 carries out coagulating.
Enter air supporting biochemistry pool 3 through the water outlet behind the coagulating, sewage is carried out that solid-liquid separation is handled and through after the fixed microorganism is decomposed the organism that contains in the sewage in the microbial suspension filler 19, enter through perforate water leg 14 and carry out filtration treatment in the Improvement type biological filter 4.In this process, the suction function that gas-liquid mixing pump 21 produces, the air suction is carried out air water with recirculation water be mixed into pressure air-dissolving water, undertaken being delivered to dissolved air release 18 after pressure is regulated by small pressure surge tank 20 then, the dissolved air water thorough mixing of waste water behind the coagulation and process dissolved air release 18, after flock and microbubble attach, rise to water surface and form scum silica frost, scum silica frost is struck off by slag scraper 17.Then, the water outlet of air supporting biochemistry pool 3 is carried out biofiltration through the inside that perforate water leg 14 enters Improvement type biological filter 4.Water outlet water outlet after the biofiltration enters in the clean water basin 5 through perforate dividing plate 15, directly discharges or reuse from rising pipe 16 after the sterilization and disinfection of sterilizing unit 22 is handled.
In the present embodiment, the purifying treatment method of oil-containing waste water of catering comprises the steps:
1) the mechanical type greasy dirt separates: oil-containing waste water of catering enters oil trap then and carries out the separation of mechanical type greasy dirt by suspended substance and impurity in the grid removal oily(waste)water;
2) suspended substance coagulating treatment: the water outlet after the mechanical type greasy dirt separates enters reaction tank, the dose that adds according to 20mg/L in the pond adds coagulant polymeric aluminium chloride, carry out entering after the mechanical stirring reaction tank and stop 10min and make most suspended substances and colloid in the water body form flock, be beneficial to follow-up solid-liquid separation;
3) air supporting biochemical treatment: after the water outlet after the coagulating treatment is come out from reaction tank, enter the pressurized dissolved air flotation biochemistry pool and carry out solid-liquid separation processing and biochemical treatment;
4) as shown in Figure 2, the air supporting biochemistry pool comprises pond body, air-dissolving apparatus, microbial suspension filler and slag scraper.Wherein, the surface, pond is provided with slag scraper, and body inner available depth in described pond comprises air supporting contact separation district and biochemical zone, and wherein, described air supporting contact separation district is positioned at the upper strata, and available depth is 1.2m, and surface load is 2m
3/ m
2H, and be provided with air-dissolving apparatus in the air supporting contact separation district; Described biochemical zone is positioned at lower floor, and available depth is 2m, and is provided with the microbial suspension filler in the biochemical zone; The air-dissolving apparatus of air supporting biochemistry pool is made up of gas-liquid mixing pump and small pressure surge tank, wherein, (concrete pressure range is-0.03～0.05Mpa) to the suction function that Gas-liquid pump produces, the air suction is carried out air water with treated recirculation water be mixed into pressure air-dissolving water, carrying out pressure by pressure balancing tank then is adjusted to and becomes dissolved air water behind 0.25～0.4Mpa and be delivered to dissolved air release, through the dissolved air water thorough mixing of the waste water after the coagulating treatment with the process dissolved air release, after flock and microbubble attach, rise to water surface and form scum silica frost, scum silica frost is struck off by the slag scraper that air supporting biochemistry pool top is provided with;
5) water body after the solid-liquid separation enters the biochemical zone of air supporting biochemistry pool lower floor downwards, be filled with the microbial suspension filler in the biochemical zone, this microbial suspension filler is a microbial membrane carrier, attached to the microorganism on this microbial membrane carrier the organism in the sewage is decomposed, can detect to determine organic removal situation by the BOD index in the decomposition course;
6) biofiltration: solid-liquid separation handle and biochemical treatment after water outlet enter Improvement type biological filter (containing the nitrification and denitrification bacterium in the Improvement type biological filter) and carry out Microbial denitrogenation and carbon removal treatment, the water outlet after using biofilter material to Microbial denitrogenation and carbon removal treatment is then filtered; The moiety of the biofilter material in the present embodiment and the mass percent of each component are: quartz sand 20%; Gac 60%; Zeolite molecular sieve 20%;
Utilize the synergy of the nitrification and denitrification bacterium in the filter tank, ammonia nitrogen in the sewage finally is converted into nitrogen discharges system, simultaneously in denitrifying process, residual organic substances in the sewage is removed with the form of carbon source, in addition, water body can further be removed the fine particle thing behind filtrate, adopt the recoil water pump back flushing to be carried out in the Improvement type biological filter, back washing strength 5L/S.m simultaneously
2, flushing cycle is: 72h, counter-flushing liquid enter in the grating tank;
7) sterilization and disinfection: use sterilizing agent that sterilization and disinfection is carried out in the water outlet after filtering and handle, sterilizing agent is ClO
2, preferred working concentration is 10mg/L, sterilization back water outlet is directly discharged or reuse by rising pipe;
8) the water outlet detected result after the purifying treatment:
Water outlet basic controlling project place to go rate data sheet after table 1 embodiment 1 purifying treatment
| Project | SS or oil removing rate | The COD clearance | The BOD clearance | Chroma removal rate |
| Oil-containing waste water of catering | ??98％ | ?95％ | ?98％ | ??70％ |
Water outlet basic controlling project emission concentration (annual average) unit: mg/L after table 2 embodiment 1 purifying treatment
| Sequence number | The basic controlling project | Primary standard A standard | Waste water (mg/L) before the purifying treatment | Water outlet after the purifying treatment (mg/ L) |
| ??1 | Chemical oxygen demand (COD) (COD) | ??50 | ??400-800 | ??≤50 |
| ??2 | Biochemical oxygen demand (BOD) (BOD 5) | ??10 | ??200-400 | ??≤10 |
| ??3 | Suspended substance (SS) | ??10 | ??250-500 | ??≤10 |
| ??4 | Vegetable and animals oils | ??1 | ??150-420 | ??≤1 |
| ??5 | Anion surfactant | ??0.5 | ??3-5 | ??≤0.5 |
| ??6 | Total nitrogen (in N) | ??15 | ??40-60 | ??≤15 |
| ??7 | Ammonia nitrogen (in N) | ??(5)8 | ??6-50 | ??≤5 |
| ??8 | Total phosphorus (in P) | ??0.5 | ??3-6 | ??≤0.5 |
| ??9 | Colourity (extension rate) | ??30 | ??100-200 | ??≤30 |
| ??10 | ??pH | ??6-9 | ??6-9 | ??6-9 |
| ??11 | The excrement colibacillus group number (individual/L) | ??10 3 | ??≥10 5 | ??≤10 3 |
Above-mentioned detected result explanation: after the purifying treatment through the oil-containing waste water of catering in the present embodiment, removed large amount of organic, grease, and the ammonia nitrogen of waste water water, colourity etc., make the every index of water outlet can satisfy the reuse water requirement, the oil-containing waste water of catering effluent quality after the processing can reach " urban wastewater treatment firm contaminants thing emission standard " one-level A emission standard, and reclaimed water can be directly discharged or be back in water outlet.
Embodiment 2
Identical among the oil-containing waste water of catering that uses in present embodiment source and the impurity that wherein contains and the embodiment 1.
The method flow of purifying treatment is:
1) the mechanical type greasy dirt separates: oil-containing waste water of catering enters oil trap then and carries out the separation of mechanical type greasy dirt by suspended substance and impurity in the grid removal oily(waste)water;
2) suspended substance coagulating treatment: the water outlet after the mechanical type greasy dirt separates enters reaction tank, the dose that adds according to 50mg/L in the pond adds aluminum sulfate coagulant, carry out entering after the mechanical stirring reaction tank and stop 5min and make most suspended substances and colloid in the water body form flock, be beneficial to follow-up solid-liquid separation;
3) air supporting biochemical treatment: after the water outlet after the coagulating treatment is come out from reaction tank, enter the pressurized dissolved air flotation biochemistry pool and carry out solid-liquid separation processing and biochemical treatment;
4) as shown in Figure 2, the air supporting biochemistry pool comprises pond body, air-dissolving apparatus, microbial suspension filler and slag scraper, wherein, the surface, pond is provided with slag scraper, and body inner available depth in described pond comprises air supporting contact separation district and biochemical zone, and wherein, described air supporting contact separation district is positioned at the upper strata, available depth is 0.7m, and surface load is 0.8m
3/ m
2H, and be provided with air-dissolving apparatus in the air supporting contact separation district; Described biochemical zone is positioned at lower floor, and available depth is 1m, and is provided with the microbial suspension filler in the biochemical zone; The air-dissolving apparatus of air supporting biochemistry pool is made up of gas-liquid mixing pump and small pressure surge tank, wherein, (concrete pressure range is-0.03～0.05Mpa) to the suction function that Gas-liquid pump produces, the air suction is carried out air water with treated recirculation water be mixed into pressure air-dissolving water, carrying out pressure by pressure balancing tank then is adjusted to and becomes dissolved air water behind 0.25～0.4Mpa and be delivered to dissolved air release, through the dissolved air water thorough mixing of the waste water after the coagulating treatment with the process dissolved air release, after flock and microbubble attach, rise to water surface and form scum silica frost, scum silica frost is struck off by the slag scraper that air supporting biochemistry pool top is provided with;
5) water body after the solid-liquid separation enters the biochemical zone of air supporting biochemistry pool lower floor downwards, be filled with the microbial suspension filler in the biochemical zone, this microbial suspension filler is a microbial membrane carrier, attached to the microorganism on this microbial membrane carrier the organism in the sewage is decomposed, can detect to determine organic place to go situation by the BOD index in the decomposition course;
6) biofiltration: solid-liquid separation handle and biochemical treatment after water outlet enter Improvement type biological filter (containing the nitrification and denitrification bacterium in the Improvement type biological filter) and carry out Microbial denitrogenation and carbon removal treatment, the water outlet after using biofilter material to Microbial denitrogenation and carbon removal treatment is then filtered; The moiety of the biofilter material in the present embodiment and the mass percent of each component are: quartz sand 10%; Gac 50%; Zeolite molecular sieve 40%;
Utilize the synergy of the nitrification and denitrification bacterium in the filter tank, ammonia nitrogen in the sewage finally is converted into nitrogen discharges system, simultaneously in denitrifying process, residual organic substances in the sewage is removed with the form of carbon source, in addition, water body can further be removed the fine particle thing behind the filter tank, adopt the recoil water pump back flushing to be carried out in the Improvement type biological filter, back washing strength 2L/S.m simultaneously
2, flushing cycle is: 24h, counter-flushing liquid enter in the grating tank;
7) sterilization and disinfection: use sterilizing agent that sterilization and disinfection is carried out in the water outlet after filtering and handle, sterilizing agent is ClO
2, working concentration is 5mg/L, sterilization back water outlet is directly discharged or reuse by rising pipe;
8) the water outlet detected result after the purifying treatment:
Water outlet basic controlling project place to go rate data sheet after table 3 embodiment 2 purifying treatment
| Project | SS or oil removing rate | The COD clearance | The BOD clearance | Chroma removal rate |
| Oil-containing waste water of catering | ??98％ | ?95％ | ?98％ | ??70％ |
Embodiment 3
Each component and the ratio thereof of the biofilter material in the step 6) are: quartz sand 30%; Gac 30%; Zeolite molecular sieve 40%, other treatment steps are with embodiment 1.
Claims (10)
1, a kind of method for purifying oil-containing waste water of catering comprises the steps:
1) the mechanical type greasy dirt separates: oil-containing waste water of catering enters oil trap then and carries out the separation of mechanical type greasy dirt by suspended substance and impurity in the grid removal oily(waste)water;
2) suspended substance coagulating treatment: the water outlet after the mechanical type greasy dirt separates enters reaction tank, adds coagulating agent in reaction tank, carries out coagulating and handles;
3) air supporting biochemical treatment: the water outlet after coagulating is handled enters the air supporting biochemistry pool and carries out solid-liquid separation processing and biochemical treatment;
4) biofiltration: solid-liquid separation handle and biochemical treatment after water outlet enter the Improvement type biological filter and carry out Microbial denitrogenation and carbon removal treatment, the water outlet after using biofilter material to Microbial denitrogenation and carbon removal treatment is then filtered;
5) sterilization and disinfection: use sterilizing agent that sterilization and disinfection is carried out in the water outlet after filtering and handle.
2, the method for purifying oil-containing waste water of catering described in claim 1 is characterized in that, described step 2) in coagulating agent be selected from polymerize aluminum chloride or the polyaluminium sulfate one or both.
3, the method for purifying oil-containing waste water of catering described in claim 1 is characterized in that, described step 2) in the throwing amount of coagulating agent be 20～50mg/L, the time of the coagulating treatment in reaction tank is 5～10min.
4, the method for purifying oil-containing waste water of catering described in claim 1, it is characterized in that, air supporting biochemistry pool in the described step 3) comprises pond body, air-dissolving apparatus, microbial suspension filler and slag scraper, wherein, the surface, pond is provided with slag scraper, and body inside, described pond comprises air supporting contact separation district and biochemical zone, wherein, described air supporting contact separation district is positioned at the upper strata, and available depth is 0.7～1.2m, and surface load is 0.8～2m
3/ m
2H, and be provided with dissolved air release in the described air supporting contact separation district; Described biochemical zone is positioned at lower floor, and available depth is 1～2m, and is provided with the microbial suspension filler in the described biochemical zone.
5, the method for purifying oil-containing waste water of catering described in claim 1 is characterized in that, the moiety of the biofilter material in the described step 4) and the mass percent of each component are: quartz sand 10～30%; Gac 30～60%; Zeolite molecular sieve 20～40%.
6, the method for purifying oil-containing waste water of catering described in claim 1 is characterized in that, in the described step 5), sterilizing agent is ClO
2, working concentration is 1～10mg/L.
7, a kind of oil-containing waste water of catering purifying treatment suite of equipment that is used for the described method of the arbitrary claim of claim 1～6 comprises the grating tank, oil trap, reaction tank, air supporting biochemistry pool, Improvement type biological filter and the clean water basin that connect successively.
8, the oil-containing waste water of catering purifying treatment suite of equipment described in claim 7 is characterized in that the inside of described grating tank is provided with grid, and a side of grating tank is provided with water inlet pipe, and opposite side is connected with oil trap; The inside of described oil trap is provided with dividing plate, and a side of oil trap is connected with reaction tank; One side of described reaction tank is connected with the air supporting biochemistry pool; Bottom one side of described air supporting biochemistry pool is connected with the Improvement type biological filter by the perforate water leg; Bottom one side of Improvement type biological filter is connected with a side of clean water basin, and the opposite side of clean water basin is provided with rising pipe.
9, the oil-containing waste water of catering purifying treatment suite of equipment described in claim 7 is characterized in that described reaction tank is provided with the dosing pond.
10, the oil-containing waste water of catering purifying treatment suite of equipment described in claim 7, it is characterized in that, the top of described air supporting biochemistry pool is provided with slag scraper, and its inside is provided with dissolved air release and microbial suspension filler, and the outside also is provided with small pressure surge tank and gas-liquid mixing pump.
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