CN107352745A - Kitchen garbage fermentation waste water processing method - Google Patents

Kitchen garbage fermentation waste water processing method Download PDF

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Publication number
CN107352745A
CN107352745A CN201710684246.9A CN201710684246A CN107352745A CN 107352745 A CN107352745 A CN 107352745A CN 201710684246 A CN201710684246 A CN 201710684246A CN 107352745 A CN107352745 A CN 107352745A
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waste water
processing
water
kitchen garbage
cod
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蒋剑虹
罗友元
唐清畅
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China Machinery International Engineering Design & Research Institute Co Ltd
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China Machinery International Engineering Design & Research Institute Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/08Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/10Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/14NH3-N
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/16Total nitrogen (tkN-N)
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/06Aerobic processes using submerged filters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/308Biological phosphorus removal

Abstract

Kitchen garbage fermentation waste water processing method, 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 handled through heavy, water quantity and quality regulation, A/O biochemical treatments, precipitation process, the processing of the first coagulative precipitation tank, Fenton reactor processing, the processing of the second coagulative precipitation tank, BAF at the beginning of oil removal.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 ".

Description

Kitchen garbage fermentation waste water processing method
Technical field
The present invention relates to kitchen garbage, waste-water processing method, and in particular to one kind takes off for kitchen garbage slurry anaerobic digestion Waste water after water, and kitchen garbage handle the wastewater produced processing method of other processes, belong 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 ".
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 kitchen garbage fermentation waste water processing method, i.e. kitchen garbage Waste water and kitchen garbage after slurry anaerobic digestion dehydration handle the wastewater produced processing method of other processes, and this method is full Foot effectively removes COD, BOD in waste water5, the pollutant such as SS while, can effectively remove TN, TP and effectively reduce chroma in waste water, And TN, TP clearance are improved, COD, BOD in the waste water after processing5、NH3The pollutants such as-N, TP, colourity can stably reach 《Integrated wastewater discharge standard》(GB8978-1996) requirement of " primary standard ".
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 progress biochemical treatment of A/O biochemical treatment apparatus, effectively removes big Part COD, BOD5、NH3- N, effectively remove TN, TP;
D, 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;
E, the waste water (supernatant in sedimentation basin) after sedimentation basin processing enters the first of the first coagulative precipitation tank Coagulation area, to the first coagulation area dosing coagulant and it is stirred, coagulation is carried out with waste water, removes phosphate, glue in waste water Body pollutant, the pollutants such as COD, SS, colourity are further removed, the waste water after the first coagulation area is handled enters first First settling zone of coagulative precipitation tank, realizes separation of solid and liquid;
F, the waste water (supernatant in coagulative precipitation tank) after first coagulative precipitation tank processing enters Fenton's reaction Device, corresponding sulfuric acid is added into Fenton reactor first, and mixed with waste water, the pH of waste water adjusted to 3~6, so Fenton reagent is added in backward Fenton reactor and is stirred, and the refractory organic pollutant in waste water is anti-in Fenton The oxidizing species effect generated during answering is lower oxidized, and macromolecular is changed into small molecule, meanwhile, partial organic substances are thorough Inorganic matter is oxidized to, further reduces COD, BOD in waste water5, the coloured groups in waste water are destroyed, and are follow-up second coagulation The colourity that precipitation process effectively reduces waste water creates conditions;
G, the waste water after Fenton reactor processing enters the second coagulation area of the second coagulative precipitation tank, mixed to second Alkali is added in coagulation zone, and is mixed with waste water, pH value of waste water is adjusted to neutrality, the iron ion in waste water is neutrality in pH value Under the conditions of coagulating occurs, form iron hydroxide not soluble in water, ferric phosphate flco, remove iron ion and TP in waste water, Meanwhile flocculation can further remove COD, SS, colourity and the other pollutants in waste water, handled through the second coagulation area Waste water afterwards enters the second settling zone of the second coagulative precipitation tank, realizes separation of solid and liquid;
H, the waste water after second coagulative precipitation tank processing, which enters in BAF, is carried out at biology and physics Reason, waste water fully contact with microbial film, and the organic matter in degrading waste water simultaneously carries out nitration denitrification denitrogenation, while carries out filtrate Filtering 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, described " oil removal just heavy processing+regulating reservoir regulation+A/O biochemical treatments " is formed into a kind of innovation shape in the present invention The processing unit of formula, i.e., oil removal precipitation process is first carried out to processed waste water, then waste water is adjusted processing, with routine Processing, the rear mode ratio for carrying out oil removal precipitation process is first adjusted, grease can be avoided in the accumulation of the regulating reservoir water surface and big Grain impurity and suspension sink to regulating reservoir bottom of pond under gravity, avoid the frequent cleaning of regulating reservoir, are advantageous to improve and make Industry efficiency;During A/O biochemical treatment apparatus carries out biochemical treatment to waste water, in the aerobic zone of A/O biochemical treatment apparatus Microorganism in activated sludge can effectively carry out metabolism, by COD, BOD in waste water5Degraded, while in activated sludge Ammonium oxidation in waste water is nitrate nitrogen and cultured water by nitrifier, the denitrification in A/O biochemical treatment apparatus anoxic zone 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, realize effective denitrogenation;Meanwhile the microorganism (polyP bacteria) in activated sludge absorbs in metabolic processes Phosphorus, forms Quadrafos and is stored in polyP bacteria (microorganism) in vivo, effectively removes the phosphorus in waste water.
2nd, the " precipitation+first time coagulating sedimentation+coagulating sedimentation of Fenton's reaction+second+aeration and biological follow-up in the present invention The combination of filter tank " and aforementioned processing unit constitutes overall new departure that the present invention is handled waste water, in aforementioned processing list On the basis of member obtains corresponding effective treatment effect, in the sedimentation basin processing of sedimentation basin, further eliminate in waste water SS;Colloid pollutant, COD, SS, TP are further eliminated in the first coagulative precipitation tank, waste water is through the first coagulative precipitation tank After processing, the COD pollutants in water, particularly macromolecular Recalcitrant chemicals obtain part removal, and it is anti-can to reduce follow-up Fenton The dosage of Fenton reagent in device is answered, saves the cost of Fenton reagent;Fenton reactor reduce further COD in waste water, BOD5, the coloured groups in waste water are destroyed, are created conditions for the colourity that follow-up second coagulative precipitation tank effectively reduces waste water; In the processing of second coagulative precipitation tank, Fenton's reaction water outlet pH is adjusted to neutrality, further remove COD, SS in waste water, colourity and Other pollutants;In the biology and physical treatment step of BAF, COD, BOD are further removed5、TN、NH3- N, together When remove the SS that remains in waste water, make it is processed by the invention after waste water in COD, BOD5、NH3The pollutants such as-N, TP, colourity are equal It can stably reach《Integrated wastewater discharge standard》(GB8978-1996) requirement of " primary standard ".
3rd, the present invention " on the basis of publication number CN106746174A " prior arts, is being additionally arranged in Fenton reactor front end " first time coagulating sedimentation ", it is additionally arranged " second of coagulating sedimentation ", " BAF " successively in Fenton reactor rear end, i.e., Form the rear portion " the first time coagulating sedimentation+coagulating sedimentation of Fenton's reaction+second+BAF processing " of the present invention program Processing unit so that COD, BOD in the waste water after processed by the invention5、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 the part set up can use it is existing Technical pattern, it is stable, it is easy to safeguard, operating cost can be reduced, relative to existing " pretreatment+anaerobism+aerobic+depth Handle (reverse osmosis membrane filtration) " group technology, 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 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;Regulating reservoir can use armored concrete pond body or carbon steel anti-corrosion pond body, embodiment Regulating reservoir 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 regulating reservoir processing enters the progress biochemical treatment of A/O biochemical treatment apparatus, effectively removes big Part COD, BOD5、NH3- N, effectively remove TN, TP;Aerobic zone in the A/O biochemical treatment apparatus (dissolved oxygen is 1.5~ Microorganism in 2.5mg/L) in activated sludge can effectively carry out metabolism (activated sludge concentration MLSS, 3.5~4.5g/ L), by COD, BOD in waste water5Degraded, while the ammonium oxidation in waste water is nitrate nitrogen by the nitrobacteria in activated sludge And cultured water, the denitrifying bacterium consumption carbon of anoxic zone (dissolved oxygen is 0.2~0.5mg/L) in the A/O biochemical treatment apparatus Source COD, BOD in waste water is removed5While, nitrate nitrogen and cultured water are converted into nitrogen, it is anti-by nitrification-denitrification Should, effective denitrogenation is realized, while the polyP bacteria (microorganism) in activated sludge absorbs phosphorus in metabolic processes, forms poly- phosphorus Hydrochlorate is stored in polyP bacteria (microorganism) in vivo, effectively removes the phosphorus (biological phosphate-eliminating) in waste water;The A/O biochemical treatment apparatus Muddy water mixed solution in aerobic zone is flowed back in the anoxic zone by the mechanism that flows back, and is formed " interior backflow ", internal reflux ratio is 200%~500%, the internal reflux ratio in this example is 300%~400%;Total waterpower of the waste water in the A/O biochemical treatment apparatus Residence time is 10~20 days, wherein anoxic zone 4~6 days, aerobic zone 6~15 days, in this example, total hrt 17 My god, wherein anoxic zone 4 days, aerobic zone 13 days;In operation, the temperature control of muddy water mixed solution in the A/O biochemical treatment apparatus At 20~35 DEG C, control is at 25~35 DEG C in this example;Water outlet COD < 700mg/L after the processing of A/O biochemical treatment apparatus, BOD5< 200mg/L, NH3- N < 15mg/L,;In this example, the A/O biochemical treatment apparatus is lived for the anaerobic-aerobic of existing structure The anaerobic-aerobic activated sludge process treatment tank of property sludge sewage-treatment plant or existing structure, by anoxic zone, aerobic zone And backflow mechanism, pipeline, rabbling mechanism, aeration mechanism etc. composition, size are 20m × 20m × 5m (depth), the 2nd pH regulating reservoirs Wastewater outlet connected by pipe fitting with the waste water inlet of A/O biochemical treatment apparatus, delivery pump is set on the pipe fitting;In operation, When the temperature of muddy water mixed solution in the A/O biochemical treatment apparatus is less than 20 DEG C, using heater by A/O biochemistry Muddy water mixed solution temperature rises to 20~35 DEG C in reason device, is such as directly heated using electric heater or is carried out by heat exchanger Heating, when muddy water mixed solution temperature is higher than 35 DEG C in the A/O biochemical treatment apparatus, the A/O is given birth to using cooling device Change muddy water mixed solution temperature in processing unit 6 and be down to 20~35 DEG C, such as cooled down using cooler or cooling tower.
D, the waste water after A/O biochemical treatment apparatus processing enters sedimentation basin progress precipitation process, realizes muddy water point From further removing SS, TP, in the step, the partial sludge after sedimentation basin mud-water separation is by reflux by described heavy In shallow lake pond lower return to the anoxic zone of A/O biochemical treatment apparatus, for maintaining the activated sludge of A/O biochemical treatment apparatus dense Spend, the excess sludge in sedimentation basin enters described mud storage pool, and the sludge of A/O biochemical treatment apparatus is back to by the sedimentation basin Reflux ratio is 50~100%, waste water SS < 100mg/L, TP < 30mg/L after precipitation process.
E, the waste water (supernatant in sedimentation basin) after sedimentation basin processing enters the first of the first coagulative precipitation tank Coagulation area, to the first coagulation area dosing coagulant and it is stirred, coagulation is carried out with waste water, removes phosphate, glue in waste water Body pollutant, the pollutants such as COD, SS, colourity are further removed, the waste water after the first coagulation area is handled enters first First settling zone of coagulative precipitation tank, realizes separation of solid and liquid, and sludge caused by precipitation is discharged into described mud storage pool;Coagulant can be adopted With molysite, aluminium salt or high polymer coagulant etc.;Waste water reaction time in the coagulation area of the first coagulative precipitation tank is 10-30 points Clock, the reaction time of embodiment is 20 minutes;In embodiment, the first coagulative precipitation tank is prior art construction, and the first coagulation sinks Shallow lake pond includes the first coagulation area and the first settling zone, and the first coagulation area connects with the first settling zone, is thrown by pipe-line mixer Liquor ferri trichloridi is added iron salt solutions is mixed with waste water, the first coagulation area sets rabbling mechanism, and first is heavy as coagulant Tube settling component is set in the area of shallow lake, and hydraulic surface loading of the waste water in settling zone is 1m3/m2.h, after coagulating kinetics Water outlet COD < 300mg/L, BOD550 times of < 150mg/L, TP < 6mg/L, SS < 50mg/L, colourity <.
F, the waste water after first coagulating kinetics (supernatant in sedimentation basin) enters Fenton reactor, according to Need, add corresponding sulfuric acid (H into Fenton reactor first2SO4), and mixed with waste water, by the pH of waste water adjust to 3~6, then add Fenton reagent into Fenton reactor, the refractory organic pollutant in waste water is in Fenton's reaction During the oxidizing species effect that generates is lower is oxidized, macromolecular is changed into small molecule, while partial organic substances are by thorough oxygen Inorganic matter is turned to, further reduces COD, BOD in waste water5, meanwhile, the coloured groups in waste water are destroyed, and are follow-up second The colourity that coagulating kinetics effectively reduce waste water creates conditions;Mole of hydrogen peroxide and ferrous ion in the Fenton reagent Than for 1~3:1, the dosage of Fenton reagent is determined by the concentration of COD in water inlet, reaction time of the waste water in Fenton reactor For 1~2 hour;In this example:Fenton reactor is the Fenton reactor of existing structure, and size is φ 2m × 3m, Fenton reactor Provided with air stirring component, reaction time (hydraulic detention time) of the waste water in Fenton reactor is about 1.5 hours;Implement In, set pipe-line mixer to add sulfuric acid (H on the pipe fitting at the waste water inlet end of Fenton reactor2SO4), and pass through the pipeline Blender makes sulfuric acid solution be mixed with the waste water in the pipe fitting, or passes through the air stirring structure in Fenton reactor Part is stirred to the sulfuric acid solution being directly added into Fenton reactor and realizes the mixing of sulfuric acid and waste water;Fenton reagent uses Measuring pump is added in Fenton reactor, is stirred by air stirring component, Fenton reagent is sufficiently mixed with waste water;PH is set Value Detection & Controling instrument automatically controls the dosage of sulfuric acid, the pH value of waste water is adjusted into 3~5, mistake in the Fenton reagent added The mol ratio of hydrogen oxide and ferrous ion is 1.5:1, water outlet COD < 200mg/L, BOD after Fenton reactor is handled5< 50mg/L。
G, through waste water after the processing of book Fenton reactor enter the second coagulation area of the second coagulative precipitation tank, it is mixed to second Alkali is added in coagulation zone and is stirred, is mixed with waste water, the pH value of waste water is adjusted to neutrality, the iron ion in waste water exists PH value is that coagulating occurs under neutrallty condition, forms iron hydroxide not soluble in water, ferric phosphate flco, removes the iron in waste water Ion and TP, meanwhile, flocculation can further remove COD, SS, colourity and other pollutants in waste water, through described second Waste water after the processing of coagulation area enters the second settling zone of the second coagulative precipitation tank, realizes separation of solid and liquid, sludge caused by precipitation It is discharged into described mud storage pool;Alkali can use sodium hydroxide, calcium oxide, calcium hydroxide etc.;Waste water is in the mixed of the second coagulative precipitation tank The reaction time is 10-30 minutes in coagulation zone, and the reaction time of embodiment is 20 minutes;Second coagulative precipitation tank is prior art knot Structure, including the second coagulation area and the second settling zone, the second coagulation area are connected with the second settling zone, and alkali is added by pipe-line mixer Species be sodium hydroxide, aqueous slkali is mixed with waste water, pH value of waste water adjusted to 7~8 i.e. neutral, sets pH value to examine Survey and automatically control alkali dosage with controller, tube settling component is set in settling zone, surface hydraulic of the waste water in settling zone is born Lotus is 1m3/m2.h.Water outlet COD < 150mg/L, BOD after coagulating kinetics5< 40mg/L, TP < 0.5mg/L, SS < 40 times of 50mg/L, colourity <.
H, the waste water after second coagulative precipitation tank processing enters BAF progress biology and physical treatment, Waste water fully contacts with microbial film, and the organic matter in degrading waste water simultaneously carries out nitration denitrification denitrogenation, while carries out filtrate Filtering and absorption, further eliminate COD, BOD in waste water5、TN、NH3-N、SS;Filtrate can use ceramic grain filter, particle to live Property carbon filtration material or other similar filtrates;In embodiment, BAF is prior art construction, using ceramic grain filter, filtering velocity 3 ~4m/h, the water outlet dissolved oxygen of BAF are not higher than 5mg/L, and BAF is periodically backwashed;Described The wastewater outlet of two coagulative precipitation tanks is communicated by pipe fitting with BAF, and delivery pump is set on the pipe fitting;Through aeration and biological Water outlet after the processing of filter tank, COD < 100mg/L, BOD5< 20mg/L, TP < 0.5mg/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 the BAF processing;When needing, then sterilized pond disinfect after discharge, Carry out disinfection i.e. to the waste water after BAF is handled and discharged after handling again, the present embodiment is to BAF processing Waste water afterwards carries out disinfection and discharged 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 ".

Claims (7)

1. kitchen garbage fermentation waste water processing method, 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 progress biochemical treatment of A/O biochemical treatment apparatus, effectively removes most of COD、BOD5、NH3- N, effectively remove TN, TP;
D, 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;
E, the waste water after sedimentation basin processing enters the first coagulation area of the first coagulative precipitation tank, is added to the first coagulation area Coagulant is simultaneously stirred, and coagulation is carried out with waste water, is removed phosphate, colloid pollutant in waste water, is further removed The pollutants such as COD, SS, colourity, the waste water after the first coagulation area is handled enter the first precipitation of the first coagulative precipitation tank Area, realize separation of solid and liquid;
F, the waste water after first coagulating kinetics enters Fenton reactor, adds sulphur into Fenton reactor first Acid, and mixed with waste water, the pH of waste water is adjusted to 3~6, Fenton reagent is then added into Fenton reactor and is carried out Stirring, the refractory organic pollutant in waste water is oxidized under the oxidizing species effect that Fenton's reaction generates, Macromolecular is changed into small molecule, while partial organic substances are inorganic matter by exhaustive oxidation, further reduces COD, BOD in waste water5, Coloured groups in waste water are destroyed, and are created conditions for the colourity that follow-up second coagulative precipitation tank effectively reduces waste water;
G, the waste water after Fenton reactor processing enters the second coagulation area of the second coagulative precipitation tank, to the second coagulation area Alkali is inside added, and is mixed with waste water, pH value of waste water is adjusted to neutrality, the iron ion in waste water is neutrallty condition in pH value Lower generation coagulating, iron hydroxide not soluble in water, ferric phosphate flco are formed, remove iron ion and TP in waste water, meanwhile, Flocculation can further remove COD, SS, colourity and other pollutants in waste water, after being handled through the second coagulation area Waste water enters the second settling zone of the second coagulative precipitation tank, realizes separation of solid and liquid;
H, the waste water after second 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.
2. according to the kitchen garbage fermentation waste water processing method described in claim 1, it is characterized in that:In the step c, the A/ Muddy water mixed solution in O biochemical treatment apparatus aerobic zone is flowed back in the anoxic zone by the mechanism that flows back, and is formed " interior backflow ", Internal reflux ratio is 200%~500%.
3. according to the kitchen garbage fermentation waste water processing method described in claim 2, it is characterized in that:Waste water is biochemical in the A/O The total hrt of processing unit is 10~20 days, wherein anoxic zone 4~6 days, aerobic zone 6~15 days.
4. according to the kitchen garbage fermentation waste water processing method described in claim 1, it is characterized in that:In the step d, through described Partial sludge after sedimentation basin mud-water separation is by reflux by the sedimentation basin lower return to A/O biochemical treatment apparatus In anoxic zone, reflux ratio is 50~100%.
5. according to the kitchen garbage fermentation waste water processing method described in claim 1, it is characterized in that:In the step e, waste water exists The reaction time is 10-30 minutes in first coagulation area of the first coagulative precipitation tank.
6. according to the kitchen garbage fermentation waste water processing method described in claim 1, it is characterized in that:It is described in the step f The mol ratio of hydrogen peroxide and ferrous ion is 1~3 in Fenton reagent:1, reaction time of the waste water in Fenton reactor is 1 ~2 hours.
7. according to the kitchen garbage fermentation waste water processing method described in claim 1, it is characterized in that:In the step g, waste water exists The reaction time is 10-30 minutes in second coagulation area of the second coagulative precipitation tank.
CN201710684246.9A 2017-08-11 2017-08-11 Kitchen garbage fermentation waste water processing method Pending CN107352745A (en)

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