CN106396282A - Kitchen waste paste anaerobic fermentation wastewater treatment device - Google Patents

Abstract

Disclosed is a kitchen waste paste anaerobic fermentation wastewater treatment device. Wastewater is sequentially treated through an oil-separating primary settling tank (1), an adjusting tank (2), a first pH adjusting tank (3), an ammonia stripping tower (4), a second pH adjusting tank (5), an A/O biochemical treatment device (6), a settling tank (7), a Fenton reactor (8) and a coagulatory settling tank (9), so that pollutants like COD, BOD5 and SS in the wastewater are removed, TN and TP can be effectively removed, chromaticity of the wastewater can be effectively lowered, removal rate of TN and TP is increased, pollutants like COD, BOD5, TN, NH3-N, TP and chromaticity in the wastewater after being treated can stably reach three-grade standards of 'integrated wastewater discharge standards' (GB8978-1996) and grade-B requirements of 'standards on water quality of wastewater discharged into urban sewers' (GB/T 31962-2015).

Description

Changing food waste slurry anaerobic fermentation wastewater treatment equipment

Technical field

The present invention relates to a kind of changing food waste slurry anaerobic fermentation wastewater treatment equipment is and in particular to a kind of changing food waste is starched Waste water after material anaerobic fermentation dehydration, and the processing meanss that the other operations of changing food waste process are wastewater produced, belong at sewage Reason field.

Background technology

Waste water after the dehydration of changing food waste slurry anaerobic fermentation, and the waste water that the other operations of changing food waste process produce, Waste component is complicated, belongs to the big high concentrated organic wastewater of intractability.Pollutants in Wastewater concentration is high, COD (COD, 8000～20000mg/L), BOD₅(4000～8000mg/L), total nitrogen (TN, 2000～3000mg/L), ammonia nitrogen (NH₃- N, 1500 ～2500mg/L), total phosphorus (TP, 50～150mg/L), float (SS,>8000mg/L), salinity (15000～30000mg/ L), vegetable and animals oils (800～1500mg/L), colourity (300～800 times).Cellulose in waste water, protein, lipid etc. are difficult raw Thing degradation of organic substances matter institute accounting is big, its carbon-nitrogen ratio (BOD₅:TKN) low, only 2:1～3:1, the carbon-nitrogen ratio of waste water is low to be unfavorable for Effective removal of total nitrogen.

Kitchen waste water process that mainly to adopt anaerobic bio-treated, Aerobic biological process and membrane technology to process at present etc. several or The processing meanss of multiple unit combinations.Waste water should reach after treatment《Integrated wastewater discharge standard (GB8978-1996)》In " three Level standard " is and more strict《Sewage enters town sewer water standard》GB/T 31962-2015) in " B level " standard.

There is one kind by " pretreatment unit+anaerobic processing device+aerobic treatment device+flocculation is sunk in existing processing meanss The processing meanss that shallow lake pond " is formed by combining, its deficiency is：One is that anaerobic treatment unit operational management has high demands, especially anaerobism Processing meanss consume the carbon source in waste water in running, make carbon-nitrogen ratio in waste water decline (COD, BOD further₅Reduce, ammonia Nitrogen raises), the reduction of carbon-nitrogen ratio is less useful for the biological denitrificaion of waste water；Second, the ammonia nitrogen in waste water is mainly sent out in aerobic stage Give birth to nitration reaction and be converted into nitrate nitrogen and nitrite nitrogen, due to carbon-nitrogen ratio (BOD₅:TKN) originally it is being in relatively low shape Reduced again under state, lead to carbon source to lack, because no sufficient carbon source is it is impossible to complete denitrification denitrogenation, then total nitrogen is failed effectively to drop Solution with remove, nitrogen removal rate low it is difficult to reach《Sewage enters town sewer water standard》In (GB/T 31962-2015) The requirement of " B level " standard.

Also has one kind by " pretreatment unit+anaerobic processing device+aerobic treatment device+reverse osmosis membrane mistake in prior art The processing meanss that filter device " is formed by combining, its deficiency is that one is at the anaerobism in anaerobic treatment unit and above-mentioned processing meanss Reason unit there is a problem of same；Two be reverse osmosis membrane filtration device as the advanced treating of end although can meet《Sewage Enter town sewer water standard》The requirement of " B level " standard, its defect is that oils and fatss in waste water are easily caused reverse osmosis membrane and block up Plug, the high salt branch in waste water accelerates the aging of reverse osmosis membrane, and reverse osmosis membrane service life is short, especially reverse osmosis membrane filtration dress Putting is a kind of physical filtering device, is simply retained the pollutant in waste water, pollutant is not really degraded, is produced Raw a large amount of concentrated solutions need to separately carry out the process of complex process, be easily caused secondary pollution, and operating cost is higher.

Content of the invention

For the deficiencies in the prior art, the present invention provides a kind of changing food waste slurry anaerobic fermentation wastewater treatment equipment, that is, Changing food waste slurry anaerobic fermentation dehydration after waste water and other operations of changing food waste processing procedure wastewater produced process dress Put, this device while the pollutant such as COD, BOD, SS, can effectively remove TN, NH in meeting effective removal waste water₃- N, TP and Effectively reduce chroma in waste water, and improve TN, NH₃- N, the clearance of TP, COD, BOD in the waste water after process₅、TN、NH₃-N、TP、 The pollutant such as colourity all can stably reach《Integrated wastewater discharge standard》(GB8978-1996) " grade III Standard " and《Sewage enters Town sewer water standard》GB/T 31962-2015) " B level " requirement.

Technical scheme is as follows：

Referring to accompanying drawing, including oil removal preliminary sedimentation tank 1, regulating reservoir 2, the first pH regulator pond 3, Ammonia blowing-out tower 4, the second pH regulator pond 5th, A/O biochemical treatment apparatus 6, sedimentation tank 7, Fenton reactor 8, coagulative precipitation tank 9；

Oil slick baffle plate 1a is arranged at described oil removal preliminary sedimentation tank 1 top, and sludge bucket 1b is arranged at bottom, and sludge bucket has sludge outlet 1c, every The wastewater outlet of oily preliminary sedimentation tank 1 is communicated with described regulating reservoir 2, and oil removal preliminary sedimentation tank carries out oil removal, process of just sinking to waste water, removes big Partial suspended thing SS；

Described regulating reservoir 2 is communicated with described first pH regulator pond 3, and regulating reservoir 2 is adjusted to the waste water water yield, water quality；

There is the first rabbling mechanism 3a, the first pH regulator pond (3) inner chamber is simultaneously thrown with alkali (NaOH) in described first pH regulator pond 3 Plus component communicates, the first pH regulator pond 3 carries out to the pH value of waste water adjusting for the first time, and the form making ammonia nitrogen in waste water is by NH₄ ⁺Turn Turn to free ammonia (NH₃), provide advantage for effectively removing ammonia nitrogen in follow-up Ammonia blowing-out tower processing procedure；

Offgas outlet 4a is arranged at described Ammonia blowing-out tower 4 top, and air intlet 4b is arranged at bottom, and Ammonia blowing-out tower 4 inner chamber top has joins Water component 4c, the waste water inlet of water distribution component 4c is communicated with described first pH regulator pond 3, the wastewater outlet of Ammonia blowing-out tower 4 and Two pH regulator ponds 5 communicate, and waste water is processed through Ammonia blowing-out tower, realizes stripping and the removal of free ammonia, makes the carbon-nitrogen ratio in waste water (BOD₅:TKN) improve, the biological denitrificaion for follow-up A/O biochemical treatment apparatus provides suitable carbon-nitrogen ratio condition；

Have the second rabbling mechanism 5a in described second pH regulator pond 5, the second pH regulator pond (5) inner chamber and with sulphuric acid (H₂SO₄) Add component to communicate, the second pH regulator pond 5 is communicated with the anoxic zone 6a in described A/O biochemical treatment apparatus 6, the second pH regulator pond Second regulation is carried out to the pH value of waste water, forms the suitable growing environment of microorganism, for the life of follow-up A/O biochemical treatment apparatus Change to process and necessary environment is provided；

Aerobic zone 6b in described A/O biochemical treatment apparatus 6 is communicated with described sedimentation tank 7, and A/O biochemical treatment apparatus 6 are right Waste water carries out biochemical treatment, effectively removes most COD, BOD₅, remove NH further₃- N, TN, effectively go dephosphorization；

Described sedimentation tank 7 bottom You Zhuni chamber 7a, there is sludge outlet in storage mud chamber, and sedimentation tank 7 top is anti-with described Fenton The waste water inlet answering device 8 communicates, and waste water, through sedimentation tank 7 precipitation process, removes SS and TP further；

Be provided with Gas Stirring component 8a in described Fenton reactor 8, Fenton reactor 8 inner chamber and with sulphuric acid add component and Fenton reagent adds component and communicates, and waste water is connect with Fenton reagent in described Fenton reactor 8 under acid pH environment Touch reaction, waste water is processed through Fenton reactor (8), reduce COD, BOD in waste water further₅, coloured groups quilt in waste water Destroy, the colourity of waste water effectively reduces；

Described coagulative precipitation tank 9 includes coagulation area 9a and settling zone 9b, and sludge bucket 9c, sludge bucket are arranged at the bottom of settling zone 9b 9c is provided with mud mouth 9d, and coagulation area 9a adds component with alkali (NaOH) and communicates, the wastewater outlet of described Fenton reactor 8 with mixed The coagulation area 9a of solidifying sedimentation tank 9 communicates；In operation, component is added from alkali (NaOH) in coagulation area, adds alkali, and enter with waste water Row mixing, pH value of waste water is adjusted to neutrality, and waste water occurs under pH neutral environment in the coagulation area 9a of coagulative precipitation tank Coagulating, forms water-fast hydrated ferric oxide., iron phosphate flco, removes the iron ion in waste water and TP, meanwhile, further COD in removal waste water, SS, colourity and other pollutant, the waste water after processing through described coagulation area 9a enters coagulative precipitation tank Settling zone 9b, realize solid-liquid separation, the supernatant qualified discharge in settling zone 9b, be deposited in mud in sludge bucket 9c and enter separately The mud storage pool 10 of outer setting.

Compared with the prior art, the invention has the characteristics that and technique effect：

1st, in the present invention, a kind of new processing unit is combined as, in a pH using " the first pH regulator pond+Ammonia blowing-out tower " In regulating reservoir, the pH value of waste water is carried out adjusting for the first time, the form making ammonia nitrogen in waste water is from NH₄ ⁺It is converted into free ammonia (NH₃), The free ammonia effectively removing in waste water for follow-up Ammonia blowing-out tower processing procedure provides favourable technical conditions, at Ammonia blowing-out tower Pass through liquid gas mass transport process, inverted free ammonia then switchs to gas phase by liquid phase and becomes ammonia-containing exhaust and discharge in reason, Thus realizing effective removal to part free ammonia in waste water for the Ammonia blowing-out tower, for realizing effectively removing TN, NH₃- N and raising TN, NH₃The purpose of-N clearance establishes good basis.

2nd, in the present invention, described " Ammonia blowing-out tower the+the second pH regulator pond+A/O biochemical treatment apparatus " are formed another innovation Processing unit, the free ammonia in waste water is effectively removed by the process due to described Ammonia blowing-out tower, effectively improves in waste water Carbon-nitrogen ratio, the biological denitrificaion for follow-up A/O biochemical treatment apparatus provides suitable carbon-nitrogen ratio condition, ammonia aeration process after useless Water enters in the second pH regulator pond and carries out second regulation to the pH value of waste water, defines the suitable growing environment of microorganism again；

Process due to Ammonia blowing-out tower provides suitable carbon-nitrogen ratio condition for the biological denitrificaion of A/O biochemical treatment apparatus, right The pH value of waste water carries out second regulation and defines the suitable growing environment of microorganism, in A/O biochemical treatment apparatus to waste water again During carrying out biochemical treatment, the microorganism in activated sludge in the aerobic zone of A/O biochemical treatment apparatus can be carried out effectively Metabolism, by COD, BOD in waste water₅Degraded, the ammonium oxidation in waste water is nitric acid by the nitrifier in activated sludge simultaneously Salt 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 enriched, A/ Denitrifying bacterium in O biochemical treatment apparatus anoxic zone consumes carbon source COD, BOD in removing waste water₅While, by nitrate nitrogen It is converted into nitrogen with cultured water, by nitrification-denitrification reaction it is achieved that effective denitrogenation；Meanwhile, the poly- phosphorus in activated sludge Bacterium (microorganism) absorbs phosphorus in metabolic processes, forms Quadrafos and is stored in described polyP bacteria (microorganism) in vivo, Effectively remove the phosphorus in waste water.

3rd, follow-up sedimentation tank in the present invention, Fenton reactor, coagulative precipitation tank combine composition with aforementioned processing unit Overall new departure that the present invention is processed to waste water, obtains the basis of accordingly effectively treatment effect in aforementioned processing unit On, in the sedimentation tank of sedimentation tank is processed, eliminate the SS in waste water further；In the Fenton's reaction of Fenton reactor, enter One step reduces COD, BOD in waste water₅Reduce chroma in waste water with effective；In coagulative precipitation tank is processed, remove further COD、BOD₅, TP, SS and colourity.Make processed by the invention after waste water in COD, BOD₅、TN、NH₃The pollutant such as-N, TP, colourity All can stably reach《Integrated wastewater discharge standard》(GB8978-1996) " grade III Standard " and《Sewage enters town sewer water Matter standard》The requirement of (GB/T 31962-2015) " B level ", thus avoid using lacking existing for reverse osmosis membrane processing technique Fall into.

4th, employ the front-end processing unit of " oil partiting precipitation pool+regulating reservoir " in the present invention, that is, to processed waste water first Oil removal precipitation process is carried out to waste water by oil partiting precipitation pool, then waste water is adjusted process by regulating reservoir, with conventional elder generation Be adjusted processing by regulating reservoir, after carry out the mode ratio of oil removal precipitation process, oils and fatss can be avoided in the accumulation of the regulating reservoir water surface and Large granular impurity and float sink to regulating reservoir at the bottom of pond under gravity, it is to avoid the frequent cleaning of regulating reservoir, are conducive to carrying High working performance.

With reference to specific embodiment, the present invention is further described.

Brief description

Accompanying drawing is the structural representation of the present invention.

Specific embodiment

Referring to accompanying drawing, with treatment scale as 100m³As a example the kitchen garbage, waste-water of/d, specific embodiment is as follows：

Waste water after the dehydration of changing food waste slurry anaerobic fermentation and changing food waste process the waste water quality that other operations produce： 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.

Referring to accompanying drawing, the present invention includes oil removal preliminary sedimentation tank 1, regulating reservoir 2, the first pH regulator pond 3, Ammonia blowing-out tower 4, the 2nd pH Regulating reservoir 5, A/O biochemical treatment apparatus 6, sedimentation tank 7, Fenton reactor 8, coagulative precipitation tank 9.

Oil slick baffle plate 1a is arranged at described oil removal preliminary sedimentation tank 1 top, and sludge bucket 1b is arranged at bottom, and sludge bucket has sludge outlet 1c, gives up Water enters oil removal preliminary sedimentation tank by waste pipe, and oil removal preliminary sedimentation tank carries out oil removal, process of just sinking to waste water, removes most suspended substances SS, the wastewater outlet of oil removal preliminary sedimentation tank 1 is communicated with regulating reservoir 2；In operation, described oil slick baffle plate excludes and floats on waste water in freedom The oil slick of layer, the oil slick of retention is periodically removed using corresponding device, and the large granular impurity in waste water and bulky grain float exist It is deposited in the sludge bucket of oil removal preliminary sedimentation tank bottom, the mud of precipitation is by the sludge outlet 1c on sludge bucket 1b in the presence of gravity Discharge, realize the removal of most suspended substances SS；The storage of in addition setting in being embodied as, is entered by the mud that sludge bucket 1b discharges In mud sump 10；The wastewater outlet of described oil removal preliminary sedimentation tank 1 is connected by pipe fitting or pocket member with regulating reservoir 2.

Described regulating reservoir 2 is adjusted to the water yield of waste water, water quality, is beneficial to the stable operation of subsequent treatment operation, adjusts Section pond 2 is communicated with the first pH regulator pond 3；

Described oil removal preliminary sedimentation tank and regulating reservoir can adopt armored concrete cell body or carbon steel anticorrosion equipment cell body, this example Oil removal preliminary sedimentation tank size：5m × 2m × 3m (deep), regulating reservoir dischargeable capacity 100m³.After processing through oil removal preliminary sedimentation tank and regulating reservoir, The SS ＜ 2000mg/L, vegetable and animals oils ＜ 300mg/L of waste water.

There is the first rabbling mechanism 3a, the first pH regulator pond 3 inner chamber is simultaneously added with alkali (NaOH) in described first pH regulator pond 3 Component communicates, and the first pH regulator pond 3 carries out to the pH value of waste water adjusting for the first time, and the pH value of waste water is adjusted to 10.5～12, Under this pH value, the form making ammonia nitrogen in waste water is by NH₄ ⁺It is converted into free ammonia (NH₃), in follow-up Ammonia blowing-out tower processing procedure Effectively removing ammonia nitrogen provides advantage；In operation, add NaOH into pond and be stirred mixing, realize to pH value of waste water Adjust for the first time；First pH regulator 3 pool size of this example is 1.5m × 1.5m × 1.5m (deep), configures pH value detector and control Instrument automatically controls the dosage of aqueous slkali.

Offgas outlet 4a is arranged at described Ammonia blowing-out tower 4 top, and air intlet 4b is arranged at bottom, and Ammonia blowing-out tower 4 inner chamber top has joins Water component 4c, the waste water inlet of water distribution component 4c is communicated with the first pH regulator pond 3, and waste water is processed through Ammonia blowing-out tower, realizes free The stripping of ammonia and removal, make the carbon-nitrogen ratio (BOD in waste water₅:TKN) improve to 4:1～6:1, for follow-up A/O biochemical treatment apparatus Biological denitrificaion suitable carbon-nitrogen ratio condition is provided, the wastewater outlet of Ammonia blowing-out tower 4 is communicated with the second pH regulator pond 5；Described ammonia It is provided with packing layer 4f, waste water, through water distribution component 4c water distribution, is showered on filler by top and forms drops in the middle part of stripping tower 4 inner chamber State falls along filler.In operation, the waste water after processing through the first pH regulator pond enters the water distribution component 4c of Ammonia blowing-out tower internal upper part, Through water distribution component water distribution, waste water becomes water droplet state to land from top to bottom, and air is entered by the air intlet 4b of Ammonia blowing-out tower bottom, Gas liquid ratio is 2500～3500:1, and blowed by the bottom up of Ammonia blowing-out tower inner chamber, the air-flow of rising is useless with even drop down Water is fully contacted, and by liquid gas mass transport process, free ammonia then switchs to gas phase by liquid phase and becomes ammonia-containing exhaust and by tail gas Outlet 4a discharges, because partially or mostly free ammonia is by stripping and removal, so that carbon-nitrogen ratio (BOD in waste water₅:TKN) carry Up to 4:1～6:1, thus providing suitable carbon-nitrogen ratio condition for follow-up biological denitrificaion, it is beneficial to follow-up A/O biochemical treatment dress The Nitrogen removal effect put, in this example：Gas liquid ratio is 3000:1, in waste water, carbon-nitrogen ratio improves to 5:1～6:1, ammonia nitrogen removal frank Reach more than 60%, the ammonia nitrogen ＜ 800mg/L in waste water after processing through ammonia aeration；Described first pH regulator pond 3 and described water distribution Waste water inlet on component 4c passes through to convey pipe fitting 4d connection, conveying pipe fitting 4d setting delivery pump 4e；Described Ammonia blowing-out tower 4 useless Water out is connected by pipe fitting or other component with the second pH regulator pond 5.In being embodied as, by offgas outlet 4a discharge containing ammonia Tail gas can be processed using respective handling device exhaust absorption tower, using dilute sulfuric acid as ammonia absorbing liquid, tail containing ammonia Gas with enter tail gas absorber in absorbing liquid contact and produce chemical reaction generation ammonium sulfate, the ammonia in ammonia-containing gas from Gas is transferred in absorbing liquid, the tail gas qualified discharge after absorbing, and absorbing liquid (ammonium sulfate) can be used as agricultural fertilizer or other Purposes.

Have the second rabbling mechanism 5a in described second pH regulator pond 5, the second pH regulator pond 5 inner chamber and with sulphuric acid (H₂SO₄) throw Plus component communicates, the second pH regulator pond carries out second regulation to the pH value of waste water, pH value of waste water is adjusted to 7.0～8.5, shape Become the suitable growing environment of microorganism, the biochemical treatment for follow-up A/O biochemical treatment apparatus provides necessary environment, the second pH regulator Pond 5 is communicated with the anoxic zone 6a in A/O biochemical treatment apparatus 6；In operation, add sulphuric acid H into pond₂SO₄And be stirred mixing Close, realize the pH value of waste water is carried out second regulation, configuration pH value Detection ＆ Controling instrument automatically controls adding of sulfuric acid solution Amount；In this example, the second pH regulator pool size：1.5m × 1.5m × 1.5m (deep).The wastewater outlet of described Ammonia blowing-out tower 4 passes through pipe Part or other component are connected with the waste water inlet in the second pH regulator pond.Pump 5b and corresponding pipe fitting are passed through in described second pH regulator pond 5 Communicate with the anoxic zone 6a in A/O biochemical treatment apparatus 6.

Described A/O biochemical treatment apparatus 6 carry out biochemical treatment to waste water, effectively remove most COD, BOD₅, further Remove NH₃- N, TN, effectively remove the phosphorus in waste water, the aerobic zone 6b in described A/O biochemical treatment apparatus 6 and described sedimentation tank 7 Communicate；Micro- life in operation, in A/O biochemical treatment apparatus 6 aerobic zone 6b (dissolved oxygen is 1.5～2.5mg/L) interior activated sludge Thing can carry out metabolism (activated sludge concentration MLSS, 3.5～4.5g/L) effectively, by COD, BOD in waste water₅Degraded, has Effect removes most COD, BOD₅, the ammonium oxidation in waste water is nitrate nitrogen and Asia by the nitrobacteria in activated sludge simultaneously Nitrate nitrogen, due to the carbon-nitrogen ratio (BOD in waste water₅:TKN) effectively improve in ammonia aeration processing procedure, the carbon in waste water Source is enriched, and the denitrifying bacterium in A/O biochemical treatment apparatus 6 anoxic zone 6a (dissolved oxygen is 0.2～0.5mg/L) consumes carbon source and going Except COD, BOD in waste water₅While, nitrate nitrogen and cultured water are converted into nitrogen, remove NH further₃- N, TN, pass through Nitrification-denitrification reaction, realizes effective denitrogenation, and meanwhile, the polyP bacteria (microorganism) in activated sludge is in metabolic processes Absorb phosphorus, form Quadrafos and be stored in described polyP bacteria (microorganism) in vivo, (biology removes effective phosphorus removing in waste water Phosphorus)；Muddy water mixed solution in aerobic zone 6b in described A/O biochemical treatment apparatus is flowed back in described anoxic zone 6a by backflow member 6c Interior, formed " internal reflux ", reflux ratio is 200%～500%, the internal reflux ratio in this example is 300%～400%.Waste water is in institute State in A/O biochemical treatment apparatus 6 total hrt be 10～20 days, wherein anoxic zone 4～6 days, aerobic zone 6～15 My god, in this example, total hrt is 17 days, wherein anoxic zone 4 days, aerobic zone 13 days.In this example, at described A/O biochemistry Reason device is the anaerobic-aerobic activated sludge process of existing anaerobic-aerobic activated sludge process sewage-treatment plant or existing structure Treatment tank, is made up of anoxic zone, aerobic zone and backflow member, valve, pipeline, rabbling mechanism, aeration mechanism etc., a size of 20m × 20m × 5m (deep).Water outlet COD ＜ 700mg/L, BOD after processing through A/O biochemical treatment apparatus₅＜ 200mg/L, NH₃-N ＜ 30mg/L, TN ＜ 80mg/L.

Described sedimentation tank 7 bottom You Zhuni chamber 7a, there is sludge outlet in storage mud chamber, and waste water, through sedimentation tank precipitation process, enters One step removes SS and TP in waste water, and sedimentation tank 7 top is communicated with the waste water inlet of described Fenton reactor 8；In operation, waste water Realize mud-water separation in sedimentation tank 7, remove SS, TP further；The partial sludge that mud intracavity is store in described sedimentation tank 7 bottom passes through In the anoxic zone 6a that reflux 7b flows back in A/O biochemical treatment apparatus, return sludge ratio is 50～100%, for maintaining The activated sludge concentration of A/O biochemical treatment apparatus；Waste water SS ＜ 100mg/L, TP ＜ 30mg/L after processing through sedimentation tank.Specifically In enforcement, the excess sludge of storage mud intracavity is then entered by the sludge outlet 7a in storage mud chamber in the mud storage pool 10 of other setting.

Be provided with Gas Stirring component 8a in described Fenton reactor 8, Fenton reactor 8 inner chamber and with sulphuric acid add component and Fenton reagent adds component and communicates；Waste water is connect with Fenton reagent in described Fenton reactor 8 under acid pH environment Touch reaction, reduce COD, BOD in waste water further₅, coloured groups in waste water are destroyed, and the colourity of waste water effectively reduces；

In operation, component is added by sulphuric acid in the water inlet pipe of Fenton reactor 8, adds sulphuric acid, Fenton's reaction will be entered PH value of waste water in device 8 is adjusted to acidity, and the waste water entering in Fenton reactor 8 carries out contacting instead with the Fenton reagent adding Should, the organic pollutant of the difficult for biological degradation in waste water is oxidized under the strong oxidation of Fenton reagent, and macromole is changed into It is easy to biochemical degradation, the biodegradability raising of waste water, partial organic substances are inorganic matters by exhaustive oxidation to small molecule simultaneously, enter one Step reduces COD, the BOD in waste water₅, meanwhile, the coloured groups in waste water are destroyed, and the colourity of waste water effectively reduces；Fenton is anti- Device is answered to be existing, the response time (hydraulic detention time) in Fenton reactor 8 for the waste water is 1～2 hour, in Fenton reagent Hydrogen peroxide is 1～3 with the mol ratio of ferrous ion:1, the dosage of Fenton reagent is determined by the concentration of COD in intaking.This example In：Fenton reactor a size of φ 2m × 3m, the response time (hydraulic detention time) in Fenton reactor for the waste water is about 1.5 Hour, sulphuric acid is added by pipe-line mixer, dosage is automatically controlled according to the pH value Detection ＆ Controling instrument of setting, by waste water PH value is adjusted to 4～5, and in the Fenton reagent adding, hydrogen peroxide and the mol ratio of ferrous ion are 1.5:1.Through Fenton reactor Water outlet COD ＜ 250mg/L, BOD after process₅＜ 120mg/L, 100 times of colourity ＜.

Described coagulative precipitation tank 9 includes coagulation area 9a and settling zone 9b, and sludge bucket 9c, sludge bucket are arranged at the bottom of settling zone 9b 9c is provided with mud mouth 9d, and coagulation area 9a is communicated with the component that adds of alkali NaOH, the wastewater outlet of described Fenton reactor 8 with mixed The coagulation area 9a of solidifying sedimentation tank 9 communicates；Waste water carries out coagulating sedimentation under pH neutral environment in coagulative precipitation tank, removes useless Iron ion in water and TP, remove COD in waste water, SS, colourity and other pollutant further, and realize solid-liquid to waste water and divide From；In operation, add alkali in the waste water entering coagulation area 9a, make the pH value of waste water be adjusted to neutrality, the iron ion in waste water There is coagulation process in coagulation area in neutral conditions, form water-fast hydrated ferric oxide., iron phosphate flco, remove in waste water Iron ion and TP, simultaneously flocculation can remove COD in waste water, SS, colourity and other pollutant further；Through described mixed Waste water after the process of coagulation zone 9a enters the settling zone 9b of coagulative precipitation tank, realizes solid-liquid separation, the precipitation of described coagulative precipitation tank Supernatant qualified discharge in area 9b；In this example, coagulative precipitation tank is the coagulative precipitation tank of existing structure, by pipe-line mixer Component adds alkali NaOH in the water inlet pipe of described coagulation area 9a, and setting pH value Detection ＆ Controling instrument automatically controls the throwing of aqueous slkali Dosage, the pH value of waste water entering coagulation area 9a is adjusted to 7～8 i.e. neutrality, waste water in the response time of coagulation area 9a is 20min, is provided with tube settling assembly in settling zone 9b, waste water is 1m in the hydraulic surface loading of settling zone 9b³/m².h.Through coagulation Water outlet COD ＜ 200mg/L, BOD after sedimentation tank process₅＜ 100mg/L, TP ＜ 6mg/L, SS ＜ 50mg/L, 50 times of colourity ＜, Supernatant qualified discharge in described settling zone 9b, is deposited in the mud storage pool that mud in described sludge bucket 9c enters other setting 10.

In being embodied as, the mud in mud storage pool 10 is separately disposed after device for dehydrating sladge waste process；Device for dehydrating sladge waste Centrifugal dehydrator or belt type dewaterer etc. can be adopted, this example adopts centrifugal dehydrator, the mud outward transport after dehydration.

, after apparatus of the present invention process, pollutant levels value and pollutants removal rate are as follows for waste water：

Go out water pollutant index to be superior to《Integrated wastewater discharge standard (GB8978-1996)》In " grade III Standard " and 《Sewage enters town sewer water standard》" B level " standard in GB/T 31962-2015.

Claims (8)

1. changing food waste slurry anaerobic fermentation wastewater treatment equipment, it is characterized in that including：Oil removal preliminary sedimentation tank (1), regulating reservoir (2), First pH regulator pond (3), Ammonia blowing-out tower (4), the second pH regulator pond (5), A/O biochemical treatment apparatus (6), sedimentation tank (7), Fenton Reactor (8), coagulative precipitation tank (9)；

Oil slick baffle plate (1a) is arranged at described oil removal preliminary sedimentation tank (1) top, and sludge bucket (1b) is arranged at bottom, and sludge bucket has sludge outlet (1c), the wastewater outlet of oil removal preliminary sedimentation tank (1) is communicated with described regulating reservoir (2), and oil removal preliminary sedimentation tank carries out oil removal, just sinks to waste water Process, remove most suspended substances SS；

Described regulating reservoir (2) is communicated with described first pH regulator pond (3), and regulating reservoir (2) is adjusted to the waste water water yield, water quality；

There is the first rabbling mechanism (3a), the first pH regulator pond (3) inner chamber is simultaneously thrown with alkali (NaOH) in described first pH regulator pond (3) Plus component communicates, the first pH regulator pond (3) carries out to the pH value of waste water adjusting for the first time, and the form making ammonia nitrogen in waste water is by NH₄ ⁺ It is converted into free ammonia (NH₃)；

Offgas outlet (4a) is arranged at described Ammonia blowing-out tower (4) top, and air intlet (4b), Ammonia blowing-out tower (4) inner chamber top are arranged at bottom There is water distribution component (4c), the waste water inlet of water distribution component (4c) is communicated with described first pH regulator pond (3), Ammonia blowing-out tower (4) Wastewater outlet is communicated with described second pH regulator pond (5), and waste water is processed through Ammonia blowing-out tower, realizes stripping and the removal of free ammonia, Make the carbon-nitrogen ratio (BOD in waste water₅:TKN) improve；

Have the second rabbling mechanism (5a) in described second pH regulator pond (5), the second pH regulator pond (5) inner chamber and with sulphuric acid (H₂SO₄) Add component to communicate, the second pH regulator pond (5) is communicated with the anoxic zone (6a) in described A/O biochemical treatment apparatus (6), the 2nd pH Regulating reservoir carries out second regulation to the pH value of waste water, forms the suitable growing environment of microorganism；

Aerobic zone (6b) in described A/O biochemical treatment apparatus (6) is communicated with described sedimentation tank (7), A/O biochemical treatment apparatus (6) biochemical treatment is carried out to waste water, effectively remove most COD, BOD₅, remove NH further₃- N, TN, effectively go dephosphorization；

Described sedimentation tank (7) bottom You Zhuni chamber (7a), there are sludge outlet, sedimentation tank (7) top and described Fenton in storage mud chamber The waste water inlet of reactor (8) communicates, and waste water, through sedimentation tank (7) precipitation process, removes ss suspended solid and TP in waste water further；

It is provided with Gas Stirring component (8a), Fenton reactor (8) inner chamber simultaneously adds component with sulphuric acid in described Fenton reactor (8) Add component with Fenton reagent to communicate, waste water is processed through Fenton reactor (8), reduce COD, the BOD in waste water further₅, give up Coloured groups in water are destroyed, and the colourity of waste water effectively reduces；

Described coagulative precipitation tank (9) includes coagulation area (9a) and settling zone (9b), and the bottom of settling zone (9b) is provided with sludge bucket (9c), sludge bucket is provided with mud mouth (9d), and coagulation area 9a is communicated with the component that adds of alkali NaOH, described Fenton reactor (8) Wastewater outlet is communicated with the coagulation area (9a) of coagulative precipitation tank, through coagulative precipitation tank (9) process, remove waste water in iron ion with TP, the COD in removal waste water, SS, colourity and other pollutant further, and solid-liquid separation is realized to waste water, described coagulation sinks Supernatant qualified discharge in the settling zone (9b) in shallow lake pond.

2., according to the changing food waste slurry anaerobic fermentation wastewater treatment equipment described in claim 1, it is characterized in that, a described pH Regulating reservoir (3) adjusts the pH value of waste water to 10.5～12.

3. according to the changing food waste slurry anaerobic fermentation wastewater treatment equipment described in claim 1, it is characterized in that, enter described ammonia The air of stripping tower (4) is 2500～3500 with the gas liquid ratio of the waste water entering Ammonia blowing-out tower (4):1, described Ammonia blowing-out tower inner chamber There is packing layer (4f) at middle part, the carbon-nitrogen ratio (BOD after waste water is processed through described Ammonia blowing-out tower, in waste water₅:TKN) improve to 4:1～ 6:1.

4., according to the changing food waste slurry anaerobic fermentation wastewater treatment equipment described in claim 1, it is characterized in that, described 2nd pH Regulating reservoir (5) adjusts pH value of waste water to 7.0～8.5.

5. according to the changing food waste slurry anaerobic fermentation wastewater treatment equipment described in claim 1, it is characterized in that, described A/O life The muddy water mixed solution changed in aerobic zone (6b) in processing meanss is flowed back in anoxic zone (6a) by backflow member (6c), and reflux ratio is 200%～500%.

6., according to the changing food waste slurry anaerobic fermentation wastewater treatment equipment described in claim 5, it is characterized in that, waste water is described Total hrt in A/O biochemical treatment apparatus (6) is 10～20 days, wherein anoxic zone 4～6 days, aerobic zone 6～15 My god.

7., according to the changing food waste slurry anaerobic fermentation wastewater treatment equipment described in claim 1, it is characterized in that：Described sedimentation tank (7) bottom is store the partial sludge of mud intracavity and is flowed back in anoxic zone (6a) in the A/O biochemical treatment apparatus by reflux (7b), dirt Mud reflux ratio is 50～100%.

8., according to the changing food waste slurry anaerobic fermentation wastewater treatment equipment described in claim 1, it is characterized in that, waste water is described Response time in Fenton reactor (8) is 1～2 hour, in Fenton reagent the mol ratio of hydrogen peroxide and ferrous ion be 1～ 3:1.