CN107352746A - Anaerobic digestion of kitchen wastes method of wastewater treatment - Google Patents

Anaerobic digestion of kitchen wastes method of wastewater treatment Download PDF

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Publication number
CN107352746A
CN107352746A CN201710684267.0A CN201710684267A CN107352746A CN 107352746 A CN107352746 A CN 107352746A CN 201710684267 A CN201710684267 A CN 201710684267A CN 107352746 A CN107352746 A CN 107352746A
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waste water
water
processing
ammonia
cod
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蒋剑虹
唐清畅
罗友元
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China Machinery International Engineering Design and Research Institute Co Ltd
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China Machinery International Engineering Design and Research Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/16—Total nitrogen (tkN-N)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/18—PO4-P
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

Anaerobic digestion of kitchen wastes method of wastewater treatment, waste water and kitchen garbage after being dehydrated for the anaerobic digestion of kitchen garbage slurry handle the wastewater produced processing method of other processes.Waste water is successively through heavy at the beginning of oil removal, water quantity and quality regulation, pH value regulation for the first time, the free ammonia aeration of Ammonia blowing-out tower, second of regulation of pH value, A/O biochemical treatments, precipitation process, air-flotation process, Fenton reactor processing, coagulative precipitation tank processing, BAF processing.COD, BOD in effectively removal waste water is met5, the pollutant such as SS while, can effectively remove TN, TP and effectively reduce chroma in waste water, and improve TN, TP clearance, COD, BOD in the waste water after processing5、NH3N, the pollutant such as TP, colourity can stably reach《Integrated wastewater discharge standard》The requirement of (GB8978 1996) " primary standard ", and TN is less than 70mg/L.

Description

Anaerobic digestion of kitchen wastes method of wastewater treatment
Technical field
The present invention relates to a kind of kitchen garbage, waste-water processing method, and in particular to one kind disappears for kitchen garbage slurry anaerobism Change the waste water after dehydration, and kitchen garbage handles the wastewater produced processing method of other processes, belongs to sewage treatment area.
Background technology
Waste water after kitchen garbage slurry anaerobic digestion dehydration, and kitchen garbage handle waste water caused by other processes, Waste component is complicated, the big high concentrated organic wastewater of category intractability.Pollutants in Wastewater concentration is high, COD (COD, 8000~20000mg/L), biochemical oxygen demand (BOD) (BOD5, 4000~8000mg/L), total nitrogen (TN, 2000~3000mg/L), ammonia nitrogen (NH3- N, 1500~2500mg/L), total phosphorus (TP, 50~150mg/L), suspension (SS,>8000mg/L), salt content (15000 ~30000mg/L), vegetable and animals oils (800~1500mg/L), colourity (300~1000 times).Cellulose, protein in waste water, The refractory organic such as lipid matter institute accounting is big, its carbon-nitrogen ratio (BOD5:TKN it is) low, only 2:1~3:1, the carbon nitrogen of waste water Than the low effective removal for being unfavorable for total nitrogen.
Kitchen waste water processing is at present mainly using anaerobic bio-treated, Aerobic biological process, advanced oxidation, membrane technology processing The process route combined etc. several or kinds of processes unit.It should reach after kitchen waste water processing《Integrated wastewater discharge standard (GB8978-1996)》In " grade III Standard " and《Sewage is discharged into town sewer water standard》In (GB/T 31962-2015) " B levels " standard, some areas also need to reach more strict《Integrated wastewater discharge standard》(GB8978-1996) " one-level mark It is accurate ", and total nitrogen discharge value is required.
Publication number CN106746174A document discloses " a kind of kitchen garbage slurry anaerobic fermentation method of wastewater treatment ", Waste water and kitchen garbage after being dehydrated for kitchen garbage slurry anaerobic fermentation handle the wastewater produced processing of other processes, its Step is successively：Heavy, water quantity and quality at the beginning of oil removal is adjusted, pH value is adjusted for the first time, the second free ammonia aeration of Ammonia blowing-out tower, pH value of tune Section, A/O biochemical treatments, precipitation process, Fenton reactor processing, coagulative precipitation tank are handled, in the waste water after this method processing COD、BOD5、TN、NH3The pollutants such as-N, TP, colourity can stably reach《Integrated wastewater discharge standard》(GB8978-1996) " grade III Standard " and《Sewage is discharged into town sewer water standard》GB/T 31962-2015) " B levels " requirement, have preferable Effect, but be unsatisfactory for《Integrated wastewater discharge standard》(GB8978-1996) " primary standard " requirement.
There is a kind of entitled " method of kitchen garbage, waste-water processing " in the prior art, its step includes：First through pre- place Manage, solid impurity, oil, dope in removal waste water etc., then respectively through anaerobic organism membrane reactor, aerobe film reaction Device is acidified and removed to wastewater through organic matter, is most discharged afterwards after reverse osmosis membrane processing；" the pretreatment+anaerobism+good of this method technique category Oxygen+advanced treating (reverse osmosis membrane filtration) " group technology, its deficiency are, first, the Anaerobic Treatment unit operation pipe in this method Reason requires high, and especially anaerobic processing device consumes the carbon source in waste water in the process of running, makes carbon-nitrogen ratio in waste water further Decline (COD, BOD5Reduce, ammonia nitrogen rise), the reduction of carbon-nitrogen ratio is less useful for the biological denitrificaion of waste water；Second, this method is adopted Reverse osmosis membrane processing technology, although can meet《Sewage is discharged into town sewer water standard》The requirement of " B levels " standard And《Integrated wastewater discharge standard》(GB8978-1996) requirement of " primary standard ", its deficiency are：Grease in waste water is easily led Film is caused to block, the high salt branch in waste water accelerates the aging of film, and the service life of film is short, and especially membrane technology is a kind of physics mistake Filter technology, simply the pollutant in waste water is retained, pollutant not degraded really, caused a large amount of concentrates The processing of complex process need to be separately carried out, easily causes secondary pollution, and operating cost is higher.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of anaerobic digestion of kitchen wastes method of wastewater treatment, i.e. kitchen Waste water and kitchen garbage after rubbish slurry anaerobic digestion dehydration handle the wastewater produced processing method of other processes, this method COD, BOD in effectively removal waste water is met5, the pollutant such as SS while, can effectively remove TN, TP and effectively reduce waste water color Degree, and TN, TP clearance are improved, COD, BOD in the waste water after processing5、NH3The pollutants such as-N, TP, colourity, which can be stablized, to be reached Arrive《Integrated wastewater discharge standard》(GB8978-1996) requirement of " primary standard ", and TN is smaller than 70mg/L.
The step of the inventive method, is as follows：
Referring to accompanying drawing
A, waste water initially enters oil removal preliminary sedimentation tank and carries out oil removal just heavy processing, excludes the oil slick in waste water, big in waste water Granule foreign and bulky grain suspension are deposited in oil removal preliminary sedimentation tank bottom of pond under gravity, and sludge caused by precipitation is arranged Enter mud storage pool, remove most suspended substances SS；
B, the waste water after oil removal preliminary sedimentation tank processing enters regulating reservoir, and the water, water quality to waste water are adjusted；With Beneficial to the stable operation of subsequent treatment process；
C, the waste water after regulating reservoir processing enters the first pH regulating reservoirs, adds alkali and is stirred, to useless Water pH value carries out first time regulation, makes the form of ammonia nitrogen in waste water by NH4 +It is converted into free ammonia (NH3)；For follow-up ammonia aeration mistake Effective removal ammonia nitrogen of journey provides advantage；
D, the waste water after the first pH regulating reservoirs processing enters Ammonia blowing-out tower inner chamber top, and by Ammonia blowing-out tower inner chamber Bottom up to blow air, gas liquid ratio is 2500~3500:1, waste water lands from top to bottom, the air-flow of rising and the waste water to fall Fully contact, passes through liquid --- and gas mass transport process, free ammonia then switch to gas phase by liquid phase and turn into ammonia-containing exhaust and discharge, and realize The stripping of free ammonia and removal, make the carbon-nitrogen ratio (BOD in waste water5:TKN 4) are promoted to:1~6:1；For follow-up biological denitrificaion Suitable carbon-nitrogen ratio condition is provided, in favor of follow-up biological denitrificaion treatment effect；
E, the waste water after Ammonia blowing-out tower processing enters the 2nd pH regulating reservoirs, adds sulfuric acid and is stirred, Second is carried out to pH value of waste water to adjust, and forms the suitable growing environment of microorganism；Necessary environment is provided for subsequent biochemical processing；
F, the waste water after second of pH regulating reservoirs processing enters the progress biochemical treatment of A/O biochemical treatment apparatus, has Effect removes most COD, BOD5, further remove NH3- N, TN, effectively remove TP；
G, the waste water after A/O biochemical treatment apparatus processing enters sedimentation basin progress precipitation process, realizes muddy water point From, further remove SS, TP；
H, the waste water after the precipitation process (supernatant in sedimentation basin) enters air-floating apparatus progress air-flotation process, to Coagulant is added into the waste water of air-floating apparatus, coagulation is carried out with waste water, solid- liquid separation is realized through air-flotation process, is removed useless Suspension, colloid pollutant in water, further remove the pollutants such as COD, TP, colourity；
I, the waste water after air-floating apparatus processing enters Fenton reactor, is added first into Fenton reactor corresponding Sulfuric acid, and mixed with waste water, the pH of waste water adjusted to 3~6, Fenton reagent is then added into Fenton reactor simultaneously It is stirred, the oxidizing species effect that the refractory organic pollutant in waste water generates during Fenton's reaction Lower to be oxidized, macromolecular is changed into small molecule, while partial organic substances are inorganic matter by exhaustive oxidation, further reduces in waste water COD、BOD5, the coloured groups in waste water are destroyed, and the colourity that waste water is effectively reduced for follow-up coagulating kinetics creates conditions；
J, the waste water after Fenton reactor processing enters the coagulation area of coagulative precipitation tank, is added into coagulation area Alkali, and being mixed with waste water, pH value of waste water is adjusted to neutrality, the iron ion in waste water occurs in the case where pH value is neutrallty condition Coagulating, iron hydroxide not soluble in water, ferric phosphate flco are formed, remove iron ion and TP in waste water, meanwhile, flocculation is made With COD, SS, colourity and the other pollutants that can further remove in waste water, the waste water after the coagulation area is handled enters mixed The settling zone of solidifying sedimentation basin, realizes separation of solid and liquid；
K, the waste water after coagulative precipitation tank processing, which enters, carries out biology and physical treatment in BAF, give up Water fully contacts with microbial film, and the organic matter in degrading waste water simultaneously carries out nitration denitrification denitrogenation, while carries out the mistake of filtrate Filter and absorption, further eliminate COD, BOD in waste water5、TN、NH3-N、SS；
Discharged wastewater met the national standard after the BAF processing, or sterilized pond is discharged after disinfecting again.
Compared with the prior art, the invention has the characteristics that and technique effect：
1st, a kind of new processing unit is combined as using " first time pH value regulation+ammonia aeration " in the present invention, in the first pH First time regulation is carried out to the pH value of waste water in regulating reservoir, makes the form of ammonia nitrogen in waste water from NH4 +It is converted into free ammonia (NH3), The free ammonia effectively removed in waste water for follow-up ammonia aeration processing procedure provides favourable technical conditions, in ammonia aeration processing Passing through liquid --- gas mass transport process, inverted free ammonia then switch to gas phase by liquid phase and turn into ammonia-containing exhaust and discharge, so as to Effective removal of the ammonia aeration processing procedure to free ammonia is realized, TN, NH are effectively removed to realize3- N and raising TN, NH3- N is removed The purpose of rate establishes good basis.
2nd, described " the pH value regulation+A/O of ammonia aeration+second biochemical treatments " is formed into another innovation form in the present invention Processing unit, because the ammonia aeration processing procedure is effectively removed the free ammonia in waste water, effectively improve waste water In carbon-nitrogen ratio, so as to provide suitable carbon-nitrogen ratio condition for follow-up biological denitrificaion, the waste water entrance after ammonia aeration processing Second of regulation is carried out to the pH value of waste water in 2nd pH regulating reservoirs, forms the suitable growing environment of microorganism again；
Because the processing of Ammonia blowing-out tower provides suitable carbon-nitrogen ratio condition for the biological denitrificaion of A/O biochemical treatment apparatus, together When second of regulation is carried out to the pH value of waste water and forms the suitable growing environment of microorganism, in A/O biochemical treatment apparatus pair During waste water carries out biochemical treatment, the microorganism in the aerobic zone of A/O biochemical treatment apparatus in activated sludge can be effectively Metabolism is carried out, by COD, BOD in waste water5Degraded, while the ammonium oxidation in waste water is by the nitrifier in activated sludge Nitrate nitrogen and cultured water, effectively increase the carbon-nitrogen ratio in waste water due to ammonia aeration processing procedure, and the carbon source in waste water is rich Richness, denitrifying bacterium consumption carbon source COD, BOD in waste water is removed in A/O biochemical treatment apparatus anoxic zone5While, by nitric acid Salt nitrogen and cultured water are converted into nitrogen, by nitrification-denitrification reaction, realize effective denitrogenation；Meanwhile in activated sludge Microorganism (polyP bacteria) absorbs phosphorus in metabolic processes, forms Quadrafos and is stored in polyP bacteria (microorganism) in vivo, has Effect removes the phosphorus in waste water.
3rd, " precipitation+air supporting+Fenton's reaction+coagulating sedimentation+BAF " and aforementioned processing of postmedian of the present invention The combination of unit constitutes overall new departure that the present invention is handled waste water, is obtained in aforementioned processing unit corresponding effective On the basis for the treatment of effect, in the sedimentation basin processing of sedimentation basin, the SS in waste water is further eliminated；Enter in air-floating apparatus One step eliminates colloid pollutant, COD, SS, TP, and waste water is after air-floating apparatus is handled, the COD pollutants in water, particularly Macromolecular Recalcitrant chemicals obtain part removal, can reduce the dosage of Fenton reagent in follow-up Fenton reactor, save fragrant The cost of reagent；Fenton reactor reduce further COD, BOD in waste water5, the coloured groups in waste water are destroyed, and are The colourity that follow-up coagulative precipitation tank effectively reduces waste water creates conditions；In coagulative precipitation tank processing, by Fenton's reaction water outlet pH Regulation further removes COD, SS, colourity and other pollutants in waste water to neutrality；In the biology and physics of BAF In processing step, COD, BOD are further removed5、TN、NH3- N, while remove the SS remained in waste water, make it is processed by the invention after Waste water in COD, BOD5、NH3The pollutants such as-N, TP, colourity can stably reach《Integrated wastewater discharge standard》(GB8978- 1996) requirement of " primary standard ", and TN is smaller than 70mg/L.
4th, the present invention " on the basis of publication number CN106746174A " prior arts, is being additionally arranged in Fenton reactor front end " air-floating apparatus ", it is additionally arranged " coagulative precipitation tank ", " BAF " successively in Fenton reactor rear end, that is, forms the present invention The processing unit at the rear portion " air supporting+Fenton's reaction+coagulating sedimentation+BAF processing " of scheme so that at the present invention COD, BOD in waste water after reason5、NH3The pollutants such as-N, TP, colourity can stably reach《Integrated wastewater discharge standard》 (GB8978-1996) requirement of " primary standard ", and the part set up can use prior art construction, it is stable, just In maintenance, operating cost can be reduced, relative to existing " pretreatment+anaerobism+aerobic+advanced treating (reverse osmosis membrane filtration) " group Close technique, avoid the technique because using Anaerobic Treatment and membrane technology and existing for deficiency.
With reference to embodiment, the present invention is further described.
Brief description of the drawings
Accompanying drawing is the flow chart of the inventive method.
Embodiment
Referring to accompanying drawing, using treatment scale as 100m3Exemplified by/d kitchen garbage, waste-water, embodiment is as follows：
Waste water and kitchen garbage after kitchen garbage slurry anaerobic digestion dehydration handle waste water quality caused by other processes： COD：12000~15000mg/L, BOD5：4500~5000mg/L, TN：2100~2400mg/L, NH3-N：1800~2000mg/ L, TP：110~130mg/L, SS：7000~10000mg/L, vegetable and animals oils：800~1000mg/L, pH：7.5~8, colourity： 800~1000 times.
A, the waste water after kitchen garbage slurry anaerobic digestion dehydration and kitchen garbage handle waste water caused by other processes, first It is introduced into oil removal preliminary sedimentation tank and carries out oil removal just heavy processing, excludes the oil slick in waste water, large granular impurity and bulky grain in waste water Suspension is separated and is deposited in oil removal preliminary sedimentation tank bottom of pond under gravity, and sludge caused by precipitation is discharged into storage mud Pond, remove most suspended substances SS；The oil removal preliminary sedimentation tank is prior art construction, and oil slick baffle plate is arranged at oil removal preliminary sedimentation tank top, Mud chamber is arranged at bottom, and sludge outlet is arranged at mud chamber bottom, and the sludge outlet passes through pipe fitting or other components and the mud storage pool phase Logical, the oil slick retained by the oil slick baffle plate is periodically removed using corresponding device；Oil removal preliminary sedimentation tank and regulating reservoir can use steel Reinforced concrete pond body or carbon steel anti-corrosion pond body, the oil removal preliminary sedimentation tank size of embodiment：5m × 2m × 3m (depth).
B, the waste water after the processing of oil removal preliminary sedimentation tank enters regulating reservoir, and the water, water quality to waste water are adjusted, in favor of The stable operation of subsequent treatment process；Regulating reservoir can use armored concrete pond body or carbon steel anti-corrosion pond body, the tune of embodiment Save pond dischargeable capacity 100m3；
After oil removal preliminary sedimentation tank and regulating reservoir processing, SS ＜ 2000mg/L, vegetable and animals oils the ＜ 300mg/L of waste water.
C, the waste water after adjusted pond processing enters the first pH regulating reservoirs, and alkali is added into pond and is stirred, right PH value of waste water carries out first time regulation, makes the form of ammonia nitrogen in waste water from NH4 +It is converted into free ammonia (NH3), it is follow-up ammonia aeration Effective removal ammonia nitrogen of process provides advantage；Alkali can use sodium hydroxide, calcium oxide, calcium hydroxide etc.；Embodiment adds Alkali be sodium hydroxide；PH value of waste water is adjusted to 10.5~12 in the first pH regulating reservoirs, under the pH value, in waste water The form of ammonia nitrogen is from NH4 +It is converted into free ammonia (NH3)；First pH adjusts pool size：1.5m × 1.5m × 1.5m (depth), the first pH Rabbling mechanism is set in regulating reservoir, in implementation and pH value detector is configured and automatically controls the dosage of aqueous slkali with controller.
D, the waste water after the processing of the first pH regulating reservoirs enters Ammonia blowing-out tower inner chamber top, and by Ammonia blowing-out tower intracavity bottom Air is blown up, gas liquid ratio is 2500~3500:1, waste water lands from top to bottom, and the air-flow of rising and the waste water to fall are abundant Contact, passes through liquid --- and gas mass transport process, free ammonia then switch to gas phase by liquid phase and turn into ammonia-containing exhaust and discharge, and realize free The stripping of ammonia and removal, make the carbon-nitrogen ratio (BOD in waste water5:TKN 4) are promoted to:1~6:1, provided for follow-up biological denitrificaion Suitable carbon-nitrogen ratio condition, in favor of follow-up biological denitrificaion treatment effect.The middle part of the Ammonia blowing-out tower inner chamber sets filler Layer, top are provided with water distribution component, and waste water is showered into downwards on packing layer simultaneously through water distribution component water distribution from Ammonia blowing-out tower inner chamber top Fallen into water droplet state along filler, form adverse current with the air being blown up from bottom of towe, air fully contacts with waste water, free ammonia Gas phase is then switched to by liquid phase and turns into ammonia-containing exhaust, up to more than 60%, the ammonia-containing exhaust discharged enters other ammonia nitrogen removal frank Corresponding processing unit otherwise processed, is such as handled into corresponding tail gas absorber；In embodiment, ammonia aeration gas liquid ratio is 3000:1, because ammonia aeration process effectively eliminates free ammonia, carbon-nitrogen ratio is improved to 5 in waste water:1~6:1；Handled through ammonia aeration The ammonia nitrogen ＜ 800mg/L of waste water afterwards.In implementation, the wastewater outlet of the first pH regulating reservoirs is by conveying pipe fitting and ammonia aeration The water distribution component water inlet of tower internal upper part is connected, and delivery pump is set on the conveying pipe fitting.
E, the waste water after Ammonia blowing-out tower is handled enters the 2nd pH regulating reservoirs, and sulfuric acid (H is added into pond2SO4) and stirred Mixing is mixed, carrying out second to pH value of waste water is adjusted, and is formed the suitable growing environment of microorganism, is provided for follow-up biochemical treatment Necessary environment；PH value of waste water is adjusted to 7.0~8.5 in the 2nd pH regulating reservoirs, the pH value of waste water is adjusted to the scope Effect is to be suitable and be advantageous to the Biochemical Treatment of follow-up A/O biochemical treatment apparatus；2nd pH adjusts pool size：1.5m× 1.5m × 1.5m (depth), the 2nd pH regulating reservoirs are interior to be provided with rabbling mechanism, in specific implementation and sets pH value Detection ＆ Controling instrument certainly The dosage of dynamic control sulfuric acid solution.
F, the waste water after second of pH regulating reservoir is handled enters the progress biochemical treatment of A/O biochemical treatment apparatus, effectively goes Except most COD, BOD5, further remove NH3- N, TN, effectively remove TP；Aerobic zone is (molten in the A/O biochemical treatment apparatus Solution oxygen is 1.5~2.5mg/L) microorganism in interior activated sludge can effectively carry out metabolism (activated sludge concentration MLSS, 3.5~4.5g/L), by COD, BOD in waste water5Degraded, while the nitrobacteria in activated sludge is by the ammonium oxidation in waste water For nitrate nitrogen and cultured water, due to the carbon-nitrogen ratio (BOD in waste water5:TKN) effectively carried in ammonia aeration processing procedure Height, the carbon source in waste water are enriched, the denitrification of anoxic zone (dissolved oxygen is 0.2~0.5mg/L) in the A/O biochemical treatment apparatus Bacterium consumption carbon source COD, BOD in waste water is removed5While, nitrate nitrogen and cultured water are converted into nitrogen, by nitrification- Anti-nitration reaction, effective denitrogenation is realized, while the polyP bacteria (microorganism) in activated sludge absorbs phosphorus in metabolic processes, Form Quadrafos and be stored in polyP bacteria (microorganism) in vivo, effectively remove the phosphorus (biological phosphate-eliminating) in waste water；The A/O is biochemical Muddy water mixed solution in processing unit aerobic zone is flowed back in the anoxic zone by the mechanism that flows back, and is formed " interior backflow ", interior time For stream than being 200%~500%, the internal reflux ratio in this example is 300%~400%；Waste water is in the A/O biochemical treatment apparatus Total hrt is 10~20 days, wherein anoxic zone 4~6 days, aerobic zone 6~15 days, in this example, total hrt For 17 days, wherein anoxic zone 4 days, aerobic zone 13 days；In operation, the temperature of muddy water mixed solution in the A/O biochemical treatment apparatus Control is at 20~35 DEG C, and control is at 25~35 DEG C in this example；Water outlet COD ＜ 700mg/ after the processing of A/O biochemical treatment apparatus L, BOD5＜ 200mg/L, NH3- N ＜ 15mg/L, TN ＜ 80mg/L.In this example, the A/O biochemical treatment apparatus is existing structure Anaerobic-aerobic activated sludge process sewage-treatment plant or existing structure anaerobic-aerobic activated sludge process treatment tank, by The composition such as anoxic zone, aerobic zone and backflow mechanism, pipeline, rabbling mechanism, aeration mechanism, size is 20m × 20m × 5m (depth), the wastewater outlet of the 2nd pH regulating reservoirs are connected with the waste water inlet of A/O biochemical treatment apparatus by pipe fitting, set on the pipe fitting Put delivery pump；In operation, when the temperature of muddy water mixed solution in the A/O biochemical treatment apparatus is less than 20 DEG C, filled using heating Put and muddy water mixed solution temperature in the A/O biochemical treatment apparatus risen to 20~35 DEG C, such as directly heated using electric heater or Heat exchanger etc. is heated, and when muddy water mixed solution temperature is higher than 35 DEG C in the A/O biochemical treatment apparatus, is filled using cooling Put to take and muddy water mixed solution temperature in the A/O biochemical treatment apparatus 6 is down to 20~35 DEG C, such as use cooler or cooling tower Etc. being cooled down.
G, the waste water after A/O biochemical treatments enters sedimentation basin progress precipitation process, realizes mud-water separation, further removes SS, TP, in the step, partial sludge after sedimentation basin mud-water separation by reflux by the sedimentation basin lower return extremely It is surplus in sedimentation basin for maintaining the activated sludge concentration of A/O biochemical treatment apparatus in the anoxic zone of A/O biochemical treatment apparatus Remaining sludge enters described mud storage pool, by the sedimentation basin be back to the return sludge ratio of A/O biochemical treatment apparatus for 50~ 100%, waste water SS ＜ 100mg/L, TP ＜ 30mg/L after precipitation process.
H, the waste water after sedimentation basin is handled (supernatant in sedimentation basin) enters air-floating apparatus progress air-flotation process, Xiang Jin Enter in the waste water of air-floating apparatus and add coagulant, coagulation is carried out with waste water, realize solid- liquid separation through air supporting, remove in waste water Suspension, colloid pollutant, further remove the pollutants such as COD, TP, colourity；Coagulant can use molysite, aluminium salt or high score Sub- flocculant etc.；Residence time of the waste water in air floatation machine is 10-30 minutes；In embodiment, air-floating apparatus is prior art knot The flat flow dissolved gas floatator of structure, liquor ferri trichloridi is added into air floatation machine by pipe-line mixer and is used as coagulant, waste water Residence time in air floatation machine is 15min, water outlet COD ＜ 300mg/L, BOD after air-floating apparatus is handled5＜ 150mg/L, 50 times of TP ＜ 6mg/L, SS ＜ 50mg/L, colourity ＜.
I, the waste water after air-floating apparatus is handled enters Fenton reactor, as needed, adds first into Fenton reactor Add corresponding sulfuric acid (H2SO4), and mixed with waste water, the pH of waste water is adjusted to 3~6, then thrown into Fenton reactor Add Fenton reagent, the oxidizing species that the refractory organic pollutant in waste water generates during Fenton's reaction are made It is oxidized with lower, macromolecular is changed into small molecule, while partial organic substances are inorganic matter by exhaustive oxidation, further reduces in waste water COD, BOD5, meanwhile, the coloured groups in waste water are destroyed, and the colourity wound of waste water is effectively reduced for follow-up coagulating kinetics Make condition；The mol ratio of hydrogen peroxide and ferrous ion is 1~3 in the Fenton reagent:1, the dosage of Fenton reagent is by entering COD concentration determines in water, and reaction time of the waste water in Fenton reactor is 1~2 hour；In this example：Fenton reactor is The Fenton reactor of existing structure, size are φ 2m × 3m, and Fenton reactor is provided with air stirring component, and waste water is in Fenton's reaction Reaction time (hydraulic detention time) in device is about 1.5 hours；In implementation, the pipe fitting at the waste water inlet end of Fenton reactor Upper setting pipe-line mixer adds sulfuric acid (H2SO4), and sulfuric acid solution and the waste water in the pipe fitting are made by the pipe-line mixer Mixed, or by the air stirring component in Fenton reactor to the sulfuric acid solution that is directly added into Fenton reactor It is stirred and realizes the mixing of sulfuric acid and waste water；Fenton reagent is added in Fenton reactor using measuring pump, passes through air Agitating member stirs, and Fenton reagent is sufficiently mixed with waste water；PH value Detection ＆ Controling instrument is set to automatically control sulfuric acid dosage, The pH value of waste water is adjusted to 3~5, the mol ratio of hydrogen peroxide and ferrous ion is 1.5 in the Fenton reagent added:1, through sweet smell Water outlet COD ＜ 200mg/L, BOD after reactor for treatment of pausing5＜ 50mg/L.
J, the waste water after Fenton reactor is handled enters the coagulation area of coagulative precipitation tank, and adding alkali into coagulation area goes forward side by side Row stirring, is mixed with waste water, and the pH value of waste water is adjusted into neutrality, and the iron ion in waste water is in the case where pH value is neutrallty condition Generation coagulating, iron hydroxide not soluble in water, ferric phosphate flco are formed, remove iron ion and TP in waste water, meanwhile, wadding Solidifying effect can further remove COD, SS, colourity and other pollutants in waste water, and the waste water after the coagulation area is handled enters Enter the settling zone of coagulative precipitation tank, realize separation of solid and liquid, sludge caused by precipitation is discharged into described mud storage pool；Alkali can use hydrogen-oxygen Change sodium, calcium oxide, calcium hydroxide etc.；Waste water reaction time in the coagulation area of coagulative precipitation tank is 10-30 minutes, embodiment Reaction time is 20 minutes；In implementation, coagulative precipitation tank is prior art construction, including coagulation area and settling zone, coagulation area with Settling zone connects, and the species that alkali is added by pipe-line mixer is sodium hydroxide, aqueous slkali is mixed with waste water, by waste water PH value is adjusted to 7~8 i.e. neutrality, sets pH value Detection ＆ Controling instrument to automatically control dosage, tube settling is set in settling zone Component, hydraulic surface loading of the waste water in settling zone is 1m3/m2.h；Water outlet COD ＜ 150mg/L after coagulating kinetics, BOD540 times of ＜ 40mg/L, TP ＜ 0.5mg/L, SS ＜ 50mg/L, colourity ＜.
K, the waste water after coagulative precipitation tank is handled enter BAF carry out biology and physical treatment, waste water with it is micro- Biomembrane fully contacts, and the organic matter in degrading waste water simultaneously carries out nitration denitrification denitrogenation, while carries out the filtering and suction of filtrate It is attached, further eliminate COD, BOD in waste water5、TN、NH3-N、SS；Filtrate can use ceramic grain filter, granular activated carbon filtrate Or other similar filtrates；In embodiment, BAF is prior art construction, using ceramic grain filter, 3~4m/h of filtering velocity, The water outlet dissolved oxygen of BAF is not higher than 5mg/L, and BAF is periodically backwashed.The coagulative precipitation tank Wastewater outlet communicated by pipe fitting with BAF, set delivery pump on the pipe fitting；After BAF is handled Water outlet, COD ＜ 100mg/L, BOD5＜ 20mg/L, TP ＜ 0.5mg/L, TN ＜ 70mg/L, NH3- N ＜ 10mg/L, vegetable and animals oils ＜ 40 times of 10mg/L, SS ＜ 40mg/L, colourity ＜.
Discharged wastewater met the national standard after BAF processing；When needing, then heel row is disinfected in sterilized pond Put, i.e., discharged after the processing that carried out disinfection again to the waste water after BAF is handled；The present embodiment is to BAF Waste water after processing carries out disinfection discharge after processing again, and disinfectant can use chlorine dioxide, ozone, bleaching powder etc..
Sludge in the mud storage pool is separately disposed after device for dehydrating sladge waste is handled；Device for dehydrating sladge waste can use centrifugation Dewaterer or belt type dewaterer etc., this example use centrifugal dehydrator, the sludge outward transport after dehydration, and dehydration liquid is reflowable at the beginning of oil removal Heavy pond.
After above-mentioned steps are handled, pollutant concentration value and pollutants removal rate are as follows：
Go out water pollutant index to reach《Integrated wastewater discharge standard (GB8978-1996)》In " primary standard ", and TN is less than 70mg/L.

Claims (8)

1. anaerobic digestion of kitchen wastes method of wastewater treatment, it is characterized in that comprising the following steps：
A, waste water initially enters oil removal preliminary sedimentation tank and carries out oil removal just heavy processing, excludes the oil slick in waste water, the bulky grain in waste water Impurity and bulky grain suspension are deposited in oil removal preliminary sedimentation tank bottom of pond under gravity, and sludge caused by precipitation is discharged into storage Mud sump, remove most suspended substances SS；
B, the waste water after oil removal preliminary sedimentation tank processing enters regulating reservoir, and the water, water quality to waste water are adjusted；
C, the waste water after regulating reservoir processing enters the first pH regulating reservoirs, adds alkali and is stirred, to waste water PH value carries out first time regulation, makes the form of ammonia nitrogen in waste water by NH4 +It is converted into free ammonia (NH3)；
D, the waste water after the first pH regulating reservoirs processing enters Ammonia blowing-out tower inner chamber top, and by Ammonia blowing-out tower intracavity bottom Air is blown up, gas liquid ratio is 2500~3500:1, waste water lands from top to bottom, and the air-flow of rising and the waste water to fall are abundant Contact, passes through liquid --- and gas mass transport process, free ammonia then switch to gas phase by liquid phase and turn into ammonia-containing exhaust and discharge, and realize free The stripping of ammonia and removal, make the carbon-nitrogen ratio (BOD in waste water5:TKN 4) are promoted to:1~6:1；
E, the waste water after Ammonia blowing-out tower processing enters the 2nd pH regulating reservoirs, adds sulfuric acid and is stirred, to useless The pH value of water carries out second and adjusted, and forms the suitable growing environment of microorganism；
F, the waste water after second of pH regulating reservoirs processing enters the progress biochemical treatment of A/O biochemical treatment apparatus, effectively goes Except most COD, BOD5, further remove NH3- N, TN, effectively remove TP；
G, the waste water after A/O biochemical treatment apparatus processing enters sedimentation basin progress precipitation process, realizes mud-water separation, enters One step removes SS, TP；
H, the waste water after the precipitation process enters air-floating apparatus, and coagulant is added into the waste water for entering air-floating apparatus, with Waste water carries out coagulation, and solid- liquid separation is realized through air-flotation process, removes suspension, colloid pollutant in waste water, further goes Except pollutants such as COD, TP, colourities；
I, the waste water after air-floating apparatus processing enters Fenton reactor, adds sulfuric acid into Fenton reactor first, and Mixed with waste water, the pH of waste water adjusted to 3~6, Fenton reagent is then added into Fenton reactor and is stirred, Refractory organic pollutant in waste water is oxidized under the oxidizing species effect that Fenton's reaction generates, macromolecular It is changed into small molecule, while partial organic substances are inorganic matter by exhaustive oxidation, further reduce COD, BOD in waste water5, meanwhile, Coloured groups in waste water are destroyed, and the colourity that waste water is effectively reduced for follow-up coagulative precipitation tank creates conditions；
J, the waste water after Fenton reactor processing enters the coagulation area of coagulative precipitation tank, and alkali is added into coagulation area, and Mixed with waste water, pH value of waste water is adjusted to neutrality, in the case where pH value is neutrallty condition coagulation occurs for the iron ion in waste water Reaction, iron hydroxide not soluble in water, ferric phosphate flco are formed, remove iron ion and TP in waste water, while flocculation can COD, SS, colourity and the other pollutants in waste water are further removed, the waste water after the coagulation area is handled sinks into coagulation The settling zone in shallow lake pond, realizes separation of solid and liquid；
K, through the coagulative precipitation tank processing after waste water enter BAF in carry out biology and physical treatment, waste water with Microbial film fully contacts, and the organic matter in degrading waste water simultaneously carries out nitration denitrification denitrogenation, at the same carry out filtrate filtering and Absorption, further eliminates COD, BOD in waste water5、TN、NH3-N、SS；
Discharged wastewater met the national standard after the BAF processing, or sterilized pond is discharged after disinfecting again.
2. according to the anaerobic digestion of kitchen wastes method of wastewater treatment described in claim 1, it is characterized in that：In the step c, the PH value of waste water is adjusted to 10.5~12 in one pH regulating reservoirs.
3. according to the anaerobic digestion of kitchen wastes method of wastewater treatment described in claim 1, it is characterized in that：In the step e, the PH value of waste water is adjusted to 7~8.5 in two pH regulating reservoirs.
4. according to the anaerobic digestion of kitchen wastes method of wastewater treatment described in claim 1, it is characterized in that：In the step f, institute The muddy water mixed solution stated in A/O biochemical treatment apparatus aerobic zone is flowed back in the anoxic zone by the mechanism that flows back, and is formed " interior time Stream ", internal reflux ratio are 200%~500%.
5. according to the anaerobic digestion of kitchen wastes method of wastewater treatment described in claim 4, it is characterized in that：Waste water is in the A/O The total hrt of biochemical treatment apparatus is 10~20 days, wherein anoxic zone 4~6 days, aerobic zone 6~15 days.
6. according to the anaerobic digestion of kitchen wastes method of wastewater treatment described in claim 1, it is characterized in that：In the step g, warp Partial sludge after the sedimentation basin mud-water separation is filled by reflux by the sedimentation basin lower return to A/O biochemical treatments In the anoxic zone put, reflux ratio is 50~100%.
7. according to the anaerobic digestion of kitchen wastes method of wastewater treatment described in claim 1, it is characterized in that：In the step i, institute The mol ratio of hydrogen peroxide and ferrous ion is 1~3 in the Fenton reagent stated:1, reaction time of the waste water in Fenton reactor For 1~2 hour.
8. according to the anaerobic digestion of kitchen wastes method of wastewater treatment described in claim 1, it is characterized in that：In the step j, give up Water reaction time in the coagulation area of coagulative precipitation tank is 10-30 minutes.
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CN106396282A (en) * 2016-11-21 2017-02-15 中机国际工程设计研究院有限责任公司 Kitchen waste paste anaerobic fermentation wastewater treatment device
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
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