CN105293833B - A kind of integrated iron and steel works' comprehensive wastewater processing unit and technique - Google Patents

A kind of integrated iron and steel works' comprehensive wastewater processing unit and technique Download PDF

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CN105293833B
CN105293833B CN201510815635.1A CN201510815635A CN105293833B CN 105293833 B CN105293833 B CN 105293833B CN 201510815635 A CN201510815635 A CN 201510815635A CN 105293833 B CN105293833 B CN 105293833B
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ozone
denitrification
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CN105293833A (en
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王丽英
谢勇冰
李海波
王项晗
巴雨
马晨
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王丽英
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Abstract

The present invention provides a kind of integrated iron and steel works' comprehensive wastewater processing unit and techniques, described device includes coagulation unit, biochemical treatment unit, filter element and ozone catalytic oxidation unit, and the biochemical treatment unit includes nitrification biofilter and denitrification bio-filter;Coagulation unit, denitrification bio-filter, nitrification biofilter, filter element and ozone catalytic oxidation unit are sequentially connected;Or, coagulation unit, ozone catalytic oxidation unit, denitrification bio-filter, nitrification biofilter and filter element are sequentially connected;Or, coagulation unit, nitrification biofilter, denitrification bio-filter, filter element and ozone catalytic oxidation unit are sequentially connected.The device can at low cost in simultaneous removing waste water COD and ammonia nitrogen, treatment effeciency is high, and stability is good, impact resistance ability is strong, easy to operate, and the type of attachment of processing unit can be flexibly selected according to water quality situation, it can realize whole flow by gravity, reduce energy consumption, be conducive to engineering popularization.

Description

A kind of integrated iron and steel works' comprehensive wastewater processing unit and technique
Technical field
The invention belongs to technical field of waste water processing, it is related to a kind of integrated iron and steel works' comprehensive wastewater processing unit and work Skill more particularly to a kind of use coagulation-biofilter-catalytic ozonation-filtering technique processing integrated iron and steel works synthesis are useless Water reaches the processing unit and technique of reuse standard.
Background technology
China is Chan Gang big countries of the world, and steel mill's production includes the production work such as material choosing, sintering, ironmaking, steel-making, steel rolling and coking Skill.Steel and iron industry water consumption is very big, and waste water is mainly derived from production process water, equipment and product cooling water, flue gas and washes Wash, place is rinsed and sanitary sewage etc., wastewater discharge is big, complicated component, and Pollutants in Wastewater concentration is high, toxicity is big, and Relatively it is difficult to biodegradation.After the processing such as conventional physico-chemical process or bioanalysis, although waste water quality can meet country and place reaches Discharge standard is marked, but there are still a considerable amount of organic matters, microorganism, colloid, particle suspensions, high valence ions in efflux wastewater And soluble inorganic salt etc., it recycles and is greatly limited.With the worsening shortages of water resource, constantly increased with water cost Add.With the continuous continuous improvement reinforced with environment protectment protection of Environment Protection Policy, to avoid industrial wastewater up to standard straight Meeting outer row causes water resource waste, waste water to also need to, by further advanced treating, to remove the pollutant in water removal, it be made to reach To industrial fresh water reuse standard.
To realize industrial effluent reusing, for the suspended matter and hardly degraded organic substance in waste water, biochemical treatment, coagulation, height A variety of ripe treatment technologies such as grade oxidation and membrane filtration have put into engineer application.As CN 103172224A disclose a kind of surface Wastewater recycling treatment process is handled, waste water flows directly into after coagulation, precipitation and carries out biochemical treatment in biochemistry pool, biochemistry pool water outlet It is sent in MBR membrane cisternas and is filtered processing, reuse standard can be reached by being discharged after processing;CN 102557292A disclose one kind Coking wastewater deep treatment and reuse method, to the coking wastewater after biochemical treatment using Fenton reagent oxidation, flocculation Method carry out advanced treating, then by the way that water quality stabilizer control water outlet is added to the rate of corrosion of carbon steel equipment, water outlet can reach To steel-making muddy water water quality requirement as circulating water system reuse;CN 1524809A disclose a kind of industrial wastewater depth Science and engineering skill, waste water initially enters a series of sand filters, ultrafiltration apparatus is sent into after ultraviolet sterilization, using two-pass reverse osmosis Processing, water outlet can return to production line and be used as high purity water;It is deep that CN 101468859A disclose a kind of high concentrated organic wastewater Cleaning treatment system is spent, the system comprises the grid of interconnection, aerating regulation pond, coagulating basin, a heavy pond, anaerobic pond, water It is excellent to solve acidification pool, aerobic biofilter, secondary settling tank, deep oxidation equipment, sludge-tank and reuse cistern, the deep oxidation equipment Photochemical catalytic oxidation clarifier of the choosing with ozone input is ultimately formed by oxidation of the ozone under photochemical catalyst catalysis Water outlet degree of purification it is high, and there is no biological pollution, water uses in being used as, and the present invention is suitable for handling various high concentrations The waste water of organic contamination;CN 103626360A disclose the advanced treating of integrated ozone catalysis oxidation-biological aerated filter water Method, the method are:Water from water inlet water pump and master of the ozone in waste water for being mixed in ozone generation system oxygen It is mixed in pipeline, by being located at the filter plate of ozone catalytic reaction zone bottom even into catalytic ozonation area, in ozone catalytic Load common biological ceramic particle in oxidant haydite upper end;The filling height of catalytic ozonation agent is 0.3m~1m;Common biology pottery The filling height of grain is 2~3m;Waste water and ozone are in ozone catalytic reaction zone under catalytic ozonation agent haydite catalytic action After fully oxidized decomposition, the biological aerated filter on top is above flowed to;The addition of ozone is the matter of ozone and COD in accessing pending water Amount is than being 0.05~1:1, waste water is 1~2 hour in the ozone catalytic reaction zone reaction time;In stopping for biological aerated filter processing It is 1~4 hour to stay the time, is finally discharged by effluent weir.
But, it is contemplated that the pollutant kind contained in comprehensive wastewater is various, complicated component, using the depth of monotechnics Treatment process is difficult the indices for effectively making water outlet meet reuse standard comprehensively, will certainly if treatment effect to be promoted Equipment and operating cost is dramatically increased, does not meet the cost-effectiveness requirement of wastewater treatment.It can in short, still lacking one kind at present Technology of the low-cost processes steel and iron industry qualified discharge waste water as recycle-water.
Invention content
The purpose of the present invention is to provide a kind of integrated iron and steel works' comprehensive wastewater processing unit and technique, the processing dress The multiple pollutant that can be effectively removed in waste water is set, treatment effeciency is high, and stability is good, and impact resistance ability is strong, easy to operate, energy consumption Low, operating cost is relatively low, is conducive to engineering popularization.
For this purpose, the present invention uses following technical scheme:
A kind of integrated iron and steel works' comprehensive wastewater processing unit, described device include coagulation unit, biochemical treatment unit and Filter element, described device further include ozone catalytic oxidation unit, and the biochemical treatment unit is including nitrification biofilter and instead Nitrify biofilter;
Coagulation unit, denitrification bio-filter nitrify biofilter, filter element and ozone catalytic oxidation unit phase successively Even;Or,
Coagulation unit, denitrification bio-filter, nitrifies biofilter and filter element phase successively at ozone catalytic oxidation unit Even;Or,
Coagulation unit nitrifies biofilter, denitrification bio-filter, filter element and ozone catalytic oxidation unit phase successively Even.
Integrated iron and steel works' comprehensive wastewater of the present invention is that integrated iron and steel works generate, has met work through preliminary treatment The waste water of the organic wastewater of industry direct discharging of waste water standard or other qualified discharges after processing.
Coagulation unit, denitrification bio-filter nitrify biofilter, filter element and ozone catalytic oxidation unit phase successively Even (referred to as:The first connection type) processing unit for wastewater biodegradability it is preferable, and in effluent quality CODcr requirement Stringent waste water recycling engineering.
Coagulation unit, denitrification bio-filter, nitrifies biofilter and filter element phase successively at ozone catalytic oxidation unit Even (referred to as:Second of connection type) processing unit for lacking in waste water or almost without available organic carbon source Waste water recycling engineering.
Coagulation unit nitrifies biofilter, denitrification bio-filter, filter element and ozone catalytic oxidation unit phase successively Even (referred to as:The third connection type) processing unit for lacking in waste water or almost without available organic carbon source, Ammonia-nitrogen content is higher, and total nitrogen requires stringent waste water recycling engineering in effluent quality.
The coagulation unit is to make suspended matter in water and colloid under the highly effective coagulation pharmacy effect added, is formed larger Flock mutually collides flocking settling, removes suspended impurity and organic matter in waste water, while efficiently removal total cyanide and color Degree, subsequent biochemical treatment unit of ensuring public security;The denitrification bio-filter is used to remove the nitrate nitrogen in water removal;The nitrification life Object filter tank is mainly used for the ammonia nitrogen in water removal;Ozone catalytic oxygen in the first described connection type and the third connection type Change unit for the organic pollution in degrading waste water, the CODcr for reducing waste water reaches quality of reused water requirement, second of connection The persistent organic pollutants that ozone catalytic oxidation unit in mode is used in degrading waste water are easily biodegradable organics, are improved useless The biodegradability of water;The filter element is used to remove fine particle, suspended matter and the part colloid in water removal.
The coagulation unit is preferably mixing-flocculation-sedimentation basin, potassium permanganate composites or accelerator.When next Concentration of suspension is relatively low in water, when SS indexs are less than 70mg/L, to ensure treatment effect, can add one at the beginning of system operation The circulating sludge (such as silt) of certainty ratio helps settling of floccus, and the impurity particle after taking off surely is made, for wadding core, to pass through high score with carrier The bridge formation suction-operated of subchain and the strainer net effect of catching of micro- sand particle, quickly generate the larger alumen ustum of density, to significantly Shorten the sedimentation time, improves the processing capacity of clarifying basin, and successfully manage HI high impact load.
Preferably, the coagulated agent added in the coagulation unit be polymeric iron, polymeric aluminum or polymer- cement based composite macromolecule In copolymer any one or at least two combination.The high-molecular copolymer of the polymeric iron can be selected from bodied ferric sulfate And/or poly-ferric chloride etc., the high-molecular copolymer of the polymeric aluminum can be selected from polyaluminium sulfate and/or aluminium polychloride etc., The high-molecular copolymer of the polymer- cement based composite can be selected from polymeric aluminum sulfate iron etc..Typical but non-limiting coagulant is combined as: Bodied ferric sulfate and poly-ferric chloride, polyaluminium sulfate and aluminium polychloride, bodied ferric sulfate, poly-ferric chloride and polyaluminum sulfate Ferro-aluminum, polyaluminium sulfate, aluminium polychloride and polymeric aluminum sulfate iron, bodied ferric sulfate, polyaluminium sulfate, gather poly-ferric chloride Close aluminium chloride and polymeric aluminum sulfate iron etc..
Filtrate in the nitrification biofilter and denitrification bio-filter is one in volcanic rock, modified haydite or coke Kind or at least two combination, typical but non-limiting combination can be:Volcanic rock and modified haydite, volcanic rock and coke, fire Mountain rock, modified haydite and coke.
Preferably, carbon nutrition is insufficient in waste water, and organic carbon source is added into denitrification bio-filter.It is excessive Additional carbon can remove in subsequent processing, treatment effect will not be had an impact.
Preferably, the organic carbon source is glucose and/or methanol.
Preferably, Prepositive denitrification bio-filter hydraulic surface loading is 8~10m3/(m2H), such as 8m3/(m2·h)、 8.5m3/(m2·h)、9m3/(m2·h)、9.5m3/(m2Or 10m h)3/(m2H) etc., denitrification load is 0.8~1.0 (kgNO3 --N)/(m2D) (containing reflux), such as 0.8 (kgNO3 --N)/(m2·d)、0.85(kgNO3 --N)/(m2·d)、0.9 (kgNO3 --N)/(m2·d)、0.95(kgNO3 --N)/(m2Or 1.0 (kgNO d)3 --N)/(m2D) etc., the empty bed residence time For 25~30min, such as 25min, 26min, 27min, 28min, 29min or 30min.(kgNO in the present invention3 --N)/ (m2D) unless otherwise instructed, mean the daily denitrification load in every square metre of filter tank surface is calculated as how many with nitrate nitrogen Kilogram.
Preferably, rear-mounted denitrification biofilter hydraulic surface loading is 8~12m3/(m2H), such as 8m3/(m2·h)、 9m3/(m2·h)、10m3/(m2·h)、11m3/(m2Or 12m h)3/(m2H) etc., denitrification load is 1.5~2.0 (kgNO3 --N)/(m2D), such as 1.6 (kgNO3 --N)/(m2·d)、0.7(kgNO3 --N)/(m2·d)、0.8(kgNO3 --N)/ (m2·d)、1.9(kgNO3 --N)/(m2Or 2.0 (kgNO d)3 --N)/(m2D) etc., the empty bed residence time is 20~25min, Such as 20min, 21min, 22min, 23min, 24min or 25min.
The denitrification bio-filter relies primarily on the denitrifying bacteria being attached on biofilter material, under anaerobic, By nitrate (NO3 -) in nitrogen (N), pass through series of intermediate products (NO2 -、NO、N2O) it is reduced to nitrogen (N2), to reduce Total nitrogen index in waste water.Denitrifying bacteria belongs to heterotroph, when shortage in waste water or almost without available organic carbon source When, preposition ozone catalytic oxidation unit may be used or add external organic carbon source.
Preferably, nitrification biofilter hydraulic surface loading is 3~5m3/(m2H), such as 3m3/(m2·h)、 3.5m3/(m2·h)、4m3/(m2·h)、4.5m3/(m2Or 5m h)3/(m2H) etc., nitrification load is 0.6~1.0 (kgNO3 --N)/(m2D), such as 0.6 (kgNO3 --N)/(m2·d)、0.7(kgNO3 --N)/(m2·d)、0.8(kgNO3 --N)/ (m2·d)、0.9(kgNO3 --N)/(m2Or 1.0 (kgNO d)3 --N)/(m2D) etc., the empty bed residence time is 40~45min, Such as 41min, 42min, 43min, 44min or 45min.
The nitrification biofilter relies primarily on the nitrobacteria being attached on biofilter material, under aerobic conditions, by ammonia Nitrogen (NH3、NH4 +) in nitrogen (N) be oxidized to nitrate, to reduce the ammonia nitrogen index in waste water.Nitrobacteria belongs to autotrophic bacterium, When wastewater biodegradability is preferable, and more available organic carbon source is contained in water, filter tank postposition, while basis should will be nitrified Effluent quality requirement, it is appropriate to flow back.
The way of realization of biochemical treatment unit uses aeration biochemical processing unit, maximum feature be collection biological oxidation and Suspended solid is retained in one, saves follow-up secondary sedimentation tank, simplifies treatment process under the premise of ensureing treatment effect;Separately Outside, the technique organic matter volumetric loading is high, and hydraulic loading is big, and hydraulic detention time is short, and capital expenditure is few, energy consumption and operating cost It is low, while can ensure higher effluent quality.In view of the nitrification, denitrification bio-filter depend not only upon at runtime Biological oxidation, there is also significant biological adsorption and filtrations, can not only remove the larger pollutant of grain size, can also inhale It is attached to remove the not strong substance of some biodegradabilities.For industrial wastewater, even if in the case where biodegradability is not strong, the technique Treatment effect also superior to general technology.
Biofilter is designed as needing constantly being backwashed, to enable biomembrane effectively to update, specific table It is now that biomembrane is relatively thin, activity is very high.In terms of the biomembrane of high activity is not only embodied in biological oxidation, degradation, more performance is made a living Object flocculation, suction-operated, the substance difficult to degrade to some can be adsorbed, are trapped in pond, be removed.
The ozone catalytic oxidation unit includes ozone reactor and the ozone generator to ozone reactor ozone supply, It is placed with catalyst in the ozone reactor.
Preferably, the catalyst is any one in activated carbon, zeolite, porous ceramics, diatomite or metal oxide Kind or at least two combination.It is typical but non-limiting to be combined as:Activated carbon and zeolite, porous ceramics and diatomite, metal Oxide, activated carbon and zeolite, activated carbon, zeolite, porous ceramics and diatomite etc..
The ozone reactor is closed container, into ozone gas the shutting off anti-by catalyst of ozone reactor It answers in device and is uniformly distributed, the contact surface bigger with catalyst enhances mass transfer, improves ozone utilization rate.
Preferably, the ozone generator is using pure oxygen as air source.
Preferably, the volumn concentration of ozone is more than 4% in the ozone gas that the anti-raw device of the ozone generates, preferably The volumn concentration of ozone is more than or equal to 10%.The bigger reaction effect of ozone concentration is better, but equipment and operating cost simultaneously It can increase.
Ozone molecule (O3) under the action of catalyst can Efficient Conversion be hydroxyl radical free radical (OH), hydroxyl radical free radical due to Its extremely strong oxidisability, oxidation it is more efficient, and to pollutant without selectivity, can effectively remove difficult to degrade in waste water Organic pollution.
Preferably, waste water from top to bottom enter ozone reactor, ozone from bottom to top enter ozone reactor, waste water with it is smelly Oxygen enters ozone reactor in this manner, and the organic pollution in waste water is aoxidized more thorough.
Preferably, residence time of the waste water in ozone catalytic oxidation unit be more than 5min, as 6min, 8min, 10min, 12min, 14min, 15min, 17min, 19min, 20min, 30min, 40min or 100min etc., preferably 10~25min.
The filter element is filter tank or filter.
Preferably, the inlet outlet pressure differential of the filter is 0.05MPa.
Preferably, the filter medium in the filter element is one kind or at least two in cobble, quartz sand or anthracite The combination of kind, it is typical but non-limiting to be combined as:Cobble and quartz sand, cobble and anthracite, cobble, quartz sand with it is smokeless Coal.
Preferably, the filtering velocity of the filter element is 5~12m3/(m2H), such as 5m3/(m2·h)、6m3/(m2·h)、 7m3/(m2·h)、8m3/(m2·h)、9m3/(m2·h)、10m3/(m2Or 11m h)3/(m2H) etc..It is described when water is smaller Filter element is preferably filter, and 8~12m may be selected in filtering velocity3/(m2·h);When water is larger, the filter element is preferably Filter tank, filtering velocity can be reduced to 5m3/(m2·h)。
It is another object of the present invention to provide a kind of technique handling waste water using device as described above, the techniques Including:
Pending waste water carries out biological denitrification processing successively after coagulating treatment and biological nitration is handled, at biological nitration Catalytic ozonation processing is carried out after waste water filtering after reason, obtains recycle-water;Or,
Pending waste water carries out catalytic ozonation processing after coagulating treatment, catalytic ozonation treated waste water according to The processing of secondary progress biological denitrification and biological nitration processing, treated that waste water is filtered for biological nitration, obtains recycle-water; Or,
Pending waste water carries out biological nitration processing and biological denitrification processing, biological denitrification successively after coagulating treatment Treated, and waste water carries out catalytic ozonation processing after filtration treatment, obtains recycle-water.
The recycle-water refers to advanced treating production water, can reach industrial fresh water standard.
The treatment process is particularly suitable for processing integrated iron and steel works comprehensive wastewater.
The coagulant that the coagulating treatment uses is appointing in the high-molecular copolymer of polymeric iron, polymeric aluminum or polymer- cement based composite It anticipates a kind of or at least two combinations.The high-molecular copolymer of the polymeric iron can be selected from bodied ferric sulfate and/or polyaluminium The high-molecular copolymer of iron etc., the polymeric aluminum can be selected from polyaluminium sulfate and/or aluminium polychloride etc., the polymer- cement based composite High-molecular copolymer can be selected from polymeric aluminum sulfate iron etc..Typical but non-limiting coagulant is combined as:Bodied ferric sulfate and poly- Close iron chloride, polyaluminium sulfate and aluminium polychloride, bodied ferric sulfate, poly-ferric chloride and polymeric aluminum sulfate iron, polyaluminum sulfate Aluminium, aluminium polychloride and polymeric aluminum sulfate iron, bodied ferric sulfate, poly-ferric chloride, polyaluminium sulfate, aluminium polychloride and polymerization Aluminium iron sulfate etc..
Preferably, the coagulating treatment is divided into mix stages, flocculated stage and precipitate phase, the residence time of mix stages For 10~30s, such as 12s, 13s, 15s, 17s, 19s, 21s, 22s, 25s or 28s, reaction time of flocculated stage is 15~ The residence time of 30min, such as 18min, 20min, 22min, 25min, 28min or 29min, precipitate phase should be greater than 2h, such as 2.5h, 3h, 4h, 5h or 8h etc..
Preferably, before the coagulating treatment, the substances such as silt are added into comprehensive wastewater, the silt is acted on coagulant Form the carrier granular that volume is larger, viscosity is higher, density is larger.
Preferably, the dosage of the silt be wastewater quality 5~20%, such as 6%, 8%, 10%, 12%, 15%, 18% or 19% etc., it is reduced according to concentration of suspension in waste water, the dosage of silt can be increased in right amount.
The biological denitrification processing carries out in denitrification bio-filter, and the biological nitration processing is in nitrification biological filter It is carried out in pond.
Preferably, the filtrate in the nitrification biofilter and denitrification bio-filter is volcanic rock, modified haydite or coke One kind in charcoal or at least two combination.
Preferably, when lacking organic carbon source in pending waste water, organic carbon source is added into the denitrification bio-filter.
Preferably, the organic carbon source added is glucose and/or methanol.
Preferably, Prepositive denitrification bio-filter hydraulic surface loading is 8~10m3/(m2H), such as 8m3/(m2·h)、 8.5m3/(m2·h)、9m3/(m2·h)、9.5m3/(m2Or 10m h)3/(m2H) etc., denitrification load is 0.8~1.0 (kgNO3 --N)/(m2D), such as 0.8 (kgNO3 --N)/(m2·d)、0.85(kgNO3 --N)/(m2·d)、0.9(kgNO3 --N)/ (m2·d)、0.95(kgNO3 --N)/(m2Or 1.0 (kgNO d)3 --N)/(m2D) etc., the empty bed residence time be 25~ 30min, such as 25min, 26min, 27min, 28min, 29min or 30min.
Preferably, rear-mounted denitrification biofilter hydraulic surface loading is 8~12m3/(m2H), such as 8m3/(m2·h)、 9m3/(m2·h)、10m3/(m2·h)、11m3/(m2Or 12m h)3/(m2H) etc., denitrification load is 1.5~2.0 (kgNO3 --N)/(m2D), such as 1.6 (kgNO3 --N)/(m2·d)、0.7(kgNO3 --N)/(m2·d)、0.8(kgNO3 --N)/ (m2·d)、1.9(kgNO3 --N)/(m2Or 2.0 (kgNO d)3 --N)/(m2D) etc., the empty bed residence time is 20~25min, Such as 20min, 21min, 22min, 23min, 24min or 25min.
Preferably, nitrification biofilter hydraulic surface loading is 3~5m3/(m2H), such as 3m3/(m2·h)、 3.5m3/(m2·h)、4m3/(m2·h)、4.5m3/(m2Or 5m h)3/(m2H) etc., nitrification load is 0.6~1.0 (kgNO3 --N)/(m2D), such as 0.6 (kgNO3 --N)/(m2·d)、0.7(kgNO3 --N)/(m2·d)、0.8(kgNO3 --N)/ (m2·d)、0.9(kgNO3 --N)/(m2Or 1.0 (kgNO d)3 --N)/(m2D) etc., the empty bed residence time is 40~45min, Such as 41min, 42min, 43min, 44min or 45min.
The catalytic ozonation processing carries out on ozone reactor.
Preferably, the ozone gas used in catalytic ozonation processing, the volumn concentration of ozone are excellent more than 4% The volumn concentration for being selected as ozone is more than or equal to 10%.
Preferably, the time of catalytic ozonation processing is more than 5min, as 6min, 8min, 10min, 12min, 14min, 15min, 17min, 19min, 20min, 30min, 40min or 100min etc., preferably 10~25min.
Preferably, the catalyst that the catalytic ozonation processing uses is activated carbon, zeolite, porous ceramics, diatomite In metal oxide any one or at least two combination, it is typical but non-limiting to be combined as:Activated carbon and zeolite, Porous ceramics and diatomite, diatomite and metal oxide, activated carbon, zeolite and porous ceramics, activated carbon, zeolite, porous pottery Porcelain, diatomite and metal oxide etc..The catalyst that the metal oxide catalyst is known to the skilled person, can root Different metal oxide catalysts is selected according to actual conditions, specifically, the metal oxide catalyst can be Al2O3、 TiO2、MnO2Or TiO2/Al2O3(TiO2Load and Al2O3On) in any one or at least two combination.
The filter medium that the filtration treatment uses is the group of one kind or at least two in cobble, quartz sand or anthracite It closes, typical but non-limiting filter medium is cobble and quartz sand, cobble and anthracite, cobble, quartz sand and anthracite.
Preferably, the filtering velocity of the filtration treatment is 5~12m3/(m2H), such as 5m3/(m2·h)、6m3/(m2·h)、 7m3/(m2·h)、8m3/(m2·h)、9m3/(m2·h)、10m3/(m2·h)、11m3/(m2Or 12m h)3/(m2H) etc..
Compared with prior art, beneficial effects of the present invention are:
Integrated iron and steel works' comprehensive wastewater processing unit provided by the invention by coagulation, catalytic ozonation, nitrification and The optimization of the key technologies such as denitrification bio-filter is integrated, COD and ammonia nitrogen that can at low cost in simultaneous removing waste water, processing effect Rate is high, in the case that COD contents are less than 30 in waste water, can still remove in waste water 50% or more COD, while also can be effective The multiple pollutant in waste water is removed, stability is good, and impact resistance ability is strong, easy to operate.
Integrated iron and steel works' comprehensive wastewater processing unit provided by the invention, the way of realization of biochemical treatment is using aeration Biological filter unit can save follow-up secondary sedimentation tank, simplify treatment process under the premise of ensureing treatment effect, reduce base Investment is built, and reduces energy consumption and operating cost;For industrial wastewater, even if in the case where biodegradability is not strong, the technique Treatment effect also superior to general technology.
Integrated iron and steel works' comprehensive wastewater processing unit provided by the invention can be according to specific water quality situation, neatly Design process flow selects three kinds of different processing unit types of attachment, when organic carbon source is more abundant in sewage, Ke Yikao Consider nitrification biofilter postposition to obtain better treatment effect, when organic carbon source content is relatively low in sewage, it may be considered that Catalytic ozonation is preposition, it can be as the small of microbial metabolism nutrition to which the hardly degraded organic substance in sewage to be degraded to Molecular organic, both improved Biodegradability of Wastewater it is not strong in the case of system operational efficiency, be significantly reduced system external Portion adds the dependence of carbon source.
Whole process can be realized using integrated iron and steel works' comprehensive wastewater processing unit provided by the invention processing comprehensive wastewater Flow by gravity reduces energy consumption, while catalytic ozonation part is equipped with catalyst in the form of retaining, and can increase reaction contact Area improves reaction efficiency.
In general, integrated iron and steel works' comprehensive wastewater processing unit processing cost provided by the invention is relatively low, is conducive to Engineering is promoted.
Description of the drawings
Fig. 1 is the process flow chart for the processing integrated iron and steel works comprehensive wastewater that Examples 1 to 3 provides;
Wherein, (A) is the process flow chart that embodiment 1 provides;(B) process flow chart provided for embodiment 2;(C) it is The process flow chart that embodiment 3 provides.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.But following reality Example is only the simple example of the present invention, does not represent or limit the scope of the present invention, protection scope of the present invention It is subject to claims.
Embodiment 1
A kind of integrated iron and steel works' comprehensive wastewater processing unit, described device include sequentially connected coagulation unit, anti-nitre Change biofilter, nitrification biofilter, filter element and ozone catalytic oxidation unit;The coagulation unit is heavy for mixing-flocculation- Shallow lake pond, the filtrate in the denitrification bio-filter are volcanic rock, the filtrate in the nitrification biofilter be modified haydite and Coke, the filter element are normal pressure filter tank, and the filter medium in the normal pressure filter tank is quartz sand, the catalytic ozonation Unit is ozone reactor and the ozone generator to ozone reactor ozone supply, and catalysis is placed in the ozone reactor Agent.
It is handled shown in technique such as Fig. 1 (A) of waste water using device as described above, the technique includes the following steps:It waits locating Reason waste water initially enters coagulation unit, adds coagulated agent, and settling suspension impurity ensures that subsequent bio filter tank system is normally transported Row;
Coagulation water outlet enters denitrification bio-filter, supplements electron donor carbon source, carries out denitrification, and nitrate anion is reduced into Nitrogen is overflowed from water, to achieve the purpose that remove total nitrogen;
Denitrification water outlet enters nitrification biofilter aeration, and the residual organic substances in degrading waste water realize the depth of ammonia nitrogen Removing;
Biofilter water outlet enters filter tank, and the fine particle and colloid that removal microbial metabolism generates urge follow-up ozone Change oxidation and play security personnel's filtration, while ensureing that delivery turbidity and suspended matter are up to standard;
Filter tank water outlet enters ozone reactor, and using a small amount of ozone as oxidant, under the effect of the catalyst, hardly possible is dropped It solves oxidation operation to decompose, the indexs such as water outlet COD and coloration is made to reach processing target.
Embodiment 2
A kind of integrated iron and steel works' comprehensive wastewater processing unit, described device include sequentially connected coagulation unit, ozone Catalytic oxidation unit, denitrification bio-filter, nitrification biofilter and filter element;The coagulation unit precipitates for high density Pond, the filtrate in the denitrification bio-filter are volcanic rock and coke, the filtrate in the nitrification biofilter be volcanic rock, Modified haydite and coke, the filter element are more medium filter, the filter medium in the more medium filter be cobble, Quartz sand and anthracitic combination, the ozone catalytic oxidation unit is for ozone reactor and to ozone reactor ozone supply Ozone generator is placed with catalyst in the ozone reactor.
Using second of process waste water, as shown in Fig. 1 (B), the technique includes the following steps:Pending waste water is first It is introduced into coagulation unit, adds coagulated agent, settling suspension impurity ensures follow-up catalytic ozonation normal operation;
Coagulation water outlet enters catalytic ozonation under the effect of the catalyst, will be difficult using a small amount of ozone as oxidant Degradation of organic substances oxygenolysis is the organic matter of easily biological-degradable, improves the biodegradability of waste water, while making the coloration etc. of water outlet Index reaches processing target;
Catalytic ozonation water outlet enters denitrification bio-filter, appropriate to supplement electron donor carbon source, carries out denitrification;
Denitrification water outlet enters nitrification biofilter aeration, the residual organic substances in degrading waste water, and realizes the depth of ammonia nitrogen Degree removing;
Denitrification bio-filter water outlet enters filtering ponds, and the fine particle and colloid that removal microbial metabolism generates are used The indexs such as water COD and coloration reach processing target.
Embodiment 3
A kind of integrated iron and steel works' comprehensive wastewater processing unit, described device include sequentially connected coagulation unit, nitrification Biofilter, denitrification bio-filter, filter element and ozone catalytic oxidation unit;The coagulation unit is clarified for mechanical agitation Pond, the filtrate in the denitrification bio-filter are modified haydite, and the filtrate in the nitrification biofilter is coke, the mistake Filter unit is normal pressure filter tank, and the filter medium in the normal pressure filter tank is cobble, quartz sand and anthracitic combination, the ozone Catalytic oxidation unit is ozone reactor and the ozone generator to ozone reactor ozone supply, is put in the ozone reactor It is equipped with catalyst.
It is handled shown in technique such as Fig. 1 (C) of waste water using device as described above, the technique includes the following steps:It waits locating Reason waste water initially enters coagulation unit, adds coagulated agent, and settling suspension impurity ensures that subsequent bio filter tank system is normally transported Row;
Coagulation water outlet enters nitrification biofilter aeration, realizes the nitrification removing of ammonia nitrogen;
Nitrified effluent enters denitrification bio-filter, supplements electron donor carbon source, carries out denitrification, and nitrate anion is reduced into Nitrogen is overflowed from water, to achieve the purpose that remove total nitrogen;
Biofilter water outlet enters filtering ponds, the fine particle and colloid that removal microbial metabolism generates, to follow-up ozone Catalysis oxidation plays security personnel's filtration, while ensureing that delivery turbidity and suspended matter are up to standard;
Filtering water outlet enters catalytic ozonation, using a small amount of ozone as oxidant, under the effect of the catalyst, degradation Residual organic substances make the indexs such as water outlet COD and coloration reach processing target.
Embodiment 4
Using the processing unit of integrated iron and steel works' comprehensive wastewater described in embodiment 1 to the synthesis of steel and iron industry qualified discharge Waste water is handled, and as recycle-water, for steel and iron industry comprehensive wastewater after pre-treatment, COD 40mg/L, BOD are less than 20mg/L, Suspended matter is 20~40mg/L, and ammonia nitrogen is less than 15mg/L, and total nitrogen is less than 20mg/L.
Treatment process includes the following steps:
Integrated iron and steel works' comprehensive wastewater enters mixing-flocculation-sedimentation basin, is added into mixing-flocculation-sedimentation basin efficiently Coagulation medicine polymeric aluminum sulfate iron is thoroughly mixed flocculation reaction, 2~3 hours sedimentation times;
Mixing-flocculation-sedimentation basin water outlet enters denitrification bio-filter, and adds glucose into denitrification bio-filter With the mixture of methanol the nitrate nitrogen in waste water, the surface water of denitrification bio-filter are removed under the action of denitrifying bacterium Power load is 8m3/(m2H) (containing reflux), denitrification load is 0.85 (kgNO3 --N)/(m2D), the empty bed residence time is 25min;
Denitrification bio-filter water outlet enters nitrification biofilter, removes remaining organic matter, and depth removes the ammonia in water removal Nitrogen, nitrification biofilter hydraulic surface loading are 4m3/(m2H), nitrification load is 0.62 (kgNO3 --N)/(m2D), empty bed Residence time is 42min, and reflux ratio is less than 100%;
It nitrifies biofilter water outlet and enters normal pressure filter tank, using quartz sand as filtrate, filtering velocity 10m3/(m2H), it goes Except fine particle and colloid that microbial metabolism generates, security personnel's filtration is played to the follow-up catalytic ozonation of waste water;
The water outlet of normal pressure filter tank enters ozone reactor and, by hardly degraded organic substance oxygenolysis, makes under the action of activated carbon The water outlet indexs such as COD and coloration reach processing target, and COD oxidation loads are 1 (kg O3)/(kg COD), (the kg O3)/(kg COD) unless otherwise specified, O is meant3Quality alignment processing COD quality, reaction time 20min.
Water outlet after processing, COD are less than 20mg/L, and BOD is less than 5mg/L, and suspended matter is less than 5mg/L, and ammonia nitrogen is less than 5mg/L, total nitrogen are less than 15mg/L.
Embodiment 5
Using the processing unit of integrated iron and steel works' comprehensive wastewater described in embodiment 1 to the synthesis of steel and iron industry qualified discharge Waste water is handled, and as recycle-water, for steel and iron industry comprehensive wastewater after biochemical treatment, COD 40mg/L, BOD are less than 20mg/ L, suspended matter are 20~40mg/L, and ammonia nitrogen is less than 15mg/L, and total nitrogen is less than 20mg/L.
Treatment process includes the following steps:
Integrated iron and steel works' comprehensive wastewater enters mixing-flocculation-sedimentation basin, and polymerization is added into mixing-flocculation-sedimentation basin Aluminium iron sulfate is thoroughly mixed flocculation reaction, 2~3 hours sedimentation times;
Mixing-flocculation-sedimentation basin water outlet enters denitrification bio-filter, and adds glucose into denitrification bio-filter With the mixture of methanol the nitrate nitrogen in waste water, the surface water of denitrification bio-filter are removed under the action of denitrifying bacterium Power load is 9m3/(m2H) (containing reflux), denitrification load is 0.8 (kgNO3 --N)/(m2D), the empty bed residence time is 30min;
Denitrification bio-filter water outlet enters nitrification biofilter, removes remaining organic matter, and depth removes the ammonia in water removal Nitrogen, nitrification biofilter hydraulic surface loading are 3m3/(m2H), nitrification load is 0.6 (kgNO3 --N)/(m2D), empty bed stops It is 40min to stay the time, and reflux ratio is less than 100%;
It nitrifies biofilter water outlet and enters normal pressure filter tank, using quartz sand as filtrate, filtering velocity 5m3/(m2H), it removes The fine particle and colloid that microbial metabolism generates, security personnel's filtration is played to the follow-up catalytic ozonation of waste water;
The water outlet of normal pressure filter tank enters ozone reactor, under the action of porous ceramics, by hardly degraded organic substance oxygenolysis, The indexs such as water outlet COD and coloration are made to reach processing target, COD oxidation loads are 1 (kgO3)/(kgCOD), reaction time 10min.
Water outlet after processing, COD are less than 25mg/L, and BOD is less than 5mg/L, and suspended matter is less than 5mg/L, and ammonia nitrogen is less than 5mg/L, total nitrogen are less than 18mg/L.
Embodiment 6
Using the processing unit of integrated iron and steel works' comprehensive wastewater described in embodiment 1 to the synthesis of steel and iron industry qualified discharge Waste water is handled, and as recycle-water, for steel and iron industry comprehensive wastewater after biochemical treatment, COD 40mg/L, BOD are less than 20mg/ L, suspended matter are 20~40mg/L, and ammonia nitrogen is less than 15mg/L, and total nitrogen is less than 20mg/L.
Treatment process includes the following steps:
Integrated iron and steel works' comprehensive wastewater enters mixing-flocculation-sedimentation basin, and polymerization is added into mixing-flocculation-sedimentation basin Aluminum sulfate is thoroughly mixed flocculation reaction, 2~3 hours sedimentation times;
Mixing-flocculation-sedimentation basin water outlet enters denitrification bio-filter, and adds glucose into denitrification bio-filter With the mixture of methanol the nitrate nitrogen in waste water, the surface water of denitrification bio-filter are removed under the action of denitrifying bacterium Power load is 10m3/(m2H) (containing reflux), denitrification load is 1.0 (kgNO3 --N)/(m2D), the empty bed residence time is 28min;
Denitrification bio-filter water outlet enters nitrification biofilter, removes remaining organic matter, and depth removes the ammonia in water removal Nitrogen, nitrification biofilter hydraulic surface loading are 5m3/(m2H), nitrification load is 1.0 (kgNO3 --N)/(m2D), empty bed stops It is 45min to stay the time, and reflux ratio is less than 100%;
It nitrifies biofilter water outlet and enters normal pressure filter tank, using quartz sand as filtrate, filtering velocity 12m3/(m2H), it goes Except fine particle and colloid that microbial metabolism generates, security personnel's filtration is played to the follow-up catalytic ozonation of waste water;
The water outlet of normal pressure filter tank enters ozone reactor, under the action of metal oxide catalyst, by hardly degraded organic substance Oxygenolysis, makes the indexs such as water outlet COD and coloration reach processing target, and COD oxidation loads are 1 (kgO3)/(kgCOD), reaction Time 25min.
Water outlet after processing, COD are less than 22mg/L, and BOD is less than 6mg/L, and suspended matter is less than 6mg/L, and ammonia nitrogen is less than 7mg/L, total nitrogen are less than 12mg/L.
Embodiment 7
Using the processing unit of integrated iron and steel works' comprehensive wastewater described in embodiment 3 to the synthesis of steel and iron industry qualified discharge Waste water is handled, and as recycle-water, for steel and iron industry comprehensive wastewater after biochemical treatment, COD 40mg/L, BOD are less than 20mg/ L, suspended matter are 20~40mg/L, and ammonia nitrogen is less than 15mg/L, and total nitrogen is less than 20mg/L.
Treatment process includes the following steps:
Integrated iron and steel works' comprehensive wastewater enters accelerator, and polyaluminum sulfate is added into accelerator Ferro-aluminum and bodied ferric sulfate are thoroughly mixed flocculation reaction, 2~3 hours sedimentation times;
Accelerator water outlet enters nitrification biofilter, and depth removes the ammonia nitrogen in water removal, nitrifies biofilter table Face hydraulic loading is 5m3/(m2H), nitrification load is 1.0 (kgNO3 --N)/(m2D), the empty bed residence time is 45min, is returned Stream is than being less than 100%;
It nitrifies biofilter water outlet and enters denitrification bio-filter, and add glucose and first into denitrification bio-filter The mixture of alcohol removes the nitrate nitrogen in waste water under the action of denitrifying bacterium, and the surface hydraulic of denitrification bio-filter is negative Lotus is 8m3/(m2H) (containing reflux), denitrification load is 1.5 (kgNO3 --N)/(m2D), the empty bed residence time is 20min;
Denitrification bio-filter water outlet enters normal pressure filter tank, and filtrate is used as with anthracitic combine using cobble, quartz sand, Filtering velocity is 5m3/(m2H), the fine particle and colloid that removal microbial metabolism generates, to the follow-up catalytic ozonation of waste water Play security personnel's filtration;
The water outlet of normal pressure filter tank enters ozone reactor, under the action of zeolite and porous ceramics, by hardly degraded organic substance oxygen Change and decompose, the indexs such as water outlet COD and coloration is made to reach processing target, COD oxidation loads are 1 (kgO3)/(kgCOD), when reaction Between 10min.
Water outlet after processing, COD are less than 20mg/L, and BOD is less than 5mg/L, and suspended matter is less than 5mg/L, and ammonia nitrogen is less than 5mg/L, total nitrogen are less than 15mg/L.
Embodiment 8
Using the processing unit of integrated iron and steel works' comprehensive wastewater described in embodiment 3 to the synthesis of steel and iron industry qualified discharge Waste water is handled, and as recycle-water, for steel and iron industry comprehensive wastewater after biochemical treatment, COD 40mg/L, BOD are less than 20mg/ L, suspended matter are 20~40mg/L, and ammonia nitrogen is less than 15mg/L, and total nitrogen is less than 20mg/L.
Treatment process includes the following steps:
Integrated iron and steel works' comprehensive wastewater enters accelerator, and polyaluminum sulfate is added into accelerator Ferro-aluminum is thoroughly mixed flocculation reaction, 2~3 hours sedimentation times;
Accelerator water outlet enters nitrification biofilter, and depth removes the ammonia nitrogen in water removal, nitrifies biofilter table Face hydraulic loading is 3m3/(m2H), nitrification load is 0.6 (kgNO3 --N)/(m2D), the empty bed residence time is 40min, is returned Stream is than being less than 100%;
It nitrifies biofilter water outlet and enters denitrification bio-filter, and add glucose and first into denitrification bio-filter The mixture of alcohol removes the nitrate nitrogen in waste water under the action of denitrifying bacterium, and the surface hydraulic of denitrification bio-filter is negative Lotus is 12m3/(m2H) (containing reflux), denitrification load is 2.0 (kgNO3 --N)/(m2D), the empty bed residence time is 25min;
Denitrification bio-filter water outlet enters normal pressure filter tank, and filtrate is used as with anthracitic combine using cobble, quartz sand, Filtering velocity is 12m3/(m2H), the fine particle and colloid that removal microbial metabolism generates, to the follow-up catalytic ozonation of waste water Play security personnel's filtration;
The water outlet of normal pressure filter tank enters ozone reactor and, by hardly degraded organic substance oxygenolysis, makes under the action of diatomite The water outlet indexs such as COD and coloration reach processing target, and COD oxidation loads are 1 (kgO3)/(kgCOD), reaction time 25min.
Water outlet after processing, COD are less than 28mg/L, and BOD is less than 10mg/L, and suspended matter is less than 8mg/L, and ammonia nitrogen is less than 7mg/L, total nitrogen are less than 20mg/L.
Embodiment 9
Using the processing unit of integrated iron and steel works' comprehensive wastewater described in embodiment 3 to the synthesis of steel and iron industry qualified discharge Waste water is handled, and as recycle-water, for steel and iron industry comprehensive wastewater after biochemical treatment, COD 40mg/L, BOD are less than 20mg/ L, suspended matter are 20~40mg/L, and ammonia nitrogen is less than 15mg/L, and total nitrogen is less than 20mg/L.
Treatment process includes the following steps:
Integrated iron and steel works' comprehensive wastewater enters accelerator, and polyaluminum sulfate is added into accelerator Iron and aluminium polychloride are thoroughly mixed flocculation reaction, 2~3 hours sedimentation times;
Accelerator water outlet enters nitrification biofilter, and depth removes the ammonia nitrogen in water removal, nitrifies biofilter table Face hydraulic loading is 4m3/(m2H), nitrification load is 0.8 (kgNO3 --N)/(m2D), the empty bed residence time is 42min, is returned Stream is than being less than 100%;
It nitrifies biofilter water outlet and enters denitrification bio-filter, and add glucose and first into denitrification bio-filter The mixture of alcohol removes the nitrate nitrogen in waste water under the action of denitrifying bacterium, and the surface hydraulic of denitrification bio-filter is negative Lotus is 10m3/(m2H) (containing reflux), denitrification load is 1.8 (kgNO3 --N)/(m2D), the empty bed residence time is 23min;
Denitrification bio-filter water outlet enters normal pressure filter tank, and filtrate is used as with anthracitic combine using cobble, quartz sand, Filtering velocity is 10m3/(m2H), the fine particle and colloid that removal microbial metabolism generates, to the follow-up catalytic ozonation of waste water Play security personnel's filtration;
The water outlet of normal pressure filter tank enters ozone reactor, and under the action of activated carbon and zeolite, hardly degraded organic substance is aoxidized It decomposes, the indexs such as water outlet COD and coloration is made to reach processing target, COD oxidation loads are 1 (kgO3)/(kgCOD), the reaction time 15min。
Water outlet after processing, COD are less than 20mg/L, and BOD is less than 5mg/L, and suspended matter is less than 5mg/L, and ammonia nitrogen is less than 5mg/L, total nitrogen are less than 15mg/L.
Applicant states, the foregoing is merely the specific implementation mode of the present invention, but protection scope of the present invention not office It is limited to this, person of ordinary skill in the field is it will be clearly understood that any belong to those skilled in the art and taken off in the present invention In the technical scope of dew, the change or replacement that can be readily occurred in are all fallen within protection scope of the present invention and the open scope.

Claims (26)

1. a kind of integrated iron and steel works' comprehensive wastewater processing unit, described device includes coagulation unit, biochemical treatment unit and mistake Filter unit, which is characterized in that described device further includes ozone catalytic oxidation unit, and the biochemical treatment unit is at aeration biochemical Manage unit, including nitrification biofilter and denitrification bio-filter;
Coagulation unit, denitrification bio-filter, nitrification biofilter, filter element and ozone catalytic oxidation unit are sequentially connected; Or,
Coagulation unit, ozone catalytic oxidation unit, denitrification bio-filter, nitrification biofilter and filter element are sequentially connected; Or,
Coagulation unit, nitrification biofilter, denitrification bio-filter, filter element and ozone catalytic oxidation unit are sequentially connected;
Prepositive denitrification bio-filter hydraulic surface loading is 8~10m3/(m2H), denitrification load is 0.8~1.0 (kgNO3 --N)/(m2D), the empty bed residence time is 25~30min;
Rear-mounted denitrification biofilter hydraulic surface loading is 8~12m3/(m2H), denitrification load is 1.5~2.0 (kgNO3 --N)/(m2D), the empty bed residence time is 20~25min;
Nitrification biofilter hydraulic surface loading is 3~5m3/(m2H), nitrification load is 0.6~1.0 (kgNO3 --N)/ (m2D), the empty bed residence time is 40~45min;
The coagulation unit is mixing-flocculation-sedimentation basin, potassium permanganate composites or accelerator;
The filter element is filter tank or filter;
The ozone catalytic oxidation unit includes ozone reactor and the ozone generator to ozone reactor ozone supply, described Catalyst is placed in ozone reactor.
2. the apparatus according to claim 1, which is characterized in that the coagulated agent added in the coagulation unit is polymerised sulphur In sour iron, poly-ferric chloride, polyaluminium sulfate, aluminium polychloride or polymeric aluminum sulfate iron any one or at least two group It closes.
3. the apparatus according to claim 1, which is characterized in that in the nitrification biofilter and denitrification bio-filter Filtrate is volcanic rock, modified haydite or one kind in coke or at least two combination.
4. the apparatus according to claim 1, which is characterized in that carbon nutrition is insufficient in waste water, to denitrification Organic carbon source is added in biofilter.
5. device according to claim 4, which is characterized in that the organic carbon source is glucose and/or methanol.
6. the apparatus according to claim 1, which is characterized in that the catalyst is activated carbon, zeolite, porous ceramics, silicon In diatomaceous earth or metal oxide any one or at least two combination.
7. the apparatus according to claim 1, which is characterized in that the ozone generator is using pure oxygen as air source.
8. the apparatus according to claim 1, which is characterized in that ozone in the ozone gas that the anti-raw device of the ozone generates Volumn concentration is more than 4%.
9. the apparatus according to claim 1, which is characterized in that waste water enters ozone reactor from top to bottom, and ozone is under And it is upper into ozone reactor.
10. the apparatus according to claim 1, which is characterized in that residence time of the waste water in ozone catalytic oxidation unit More than 5min.
11. the apparatus according to claim 1, which is characterized in that the inlet outlet pressure differential of the filter is 0.05MPa.
12. the apparatus according to claim 1, which is characterized in that the filter medium in the filter element is cobble, quartz One kind in sand or anthracite or at least two combination.
13. the apparatus according to claim 1, which is characterized in that the filtering velocity of the filter element is 5~12m3/(m2·h)。
14. utilizing the technique of one of claim 1-13 described device processing waste water, which is characterized in that the technique includes:
Pending waste water carries out biological denitrification processing and biological nitration processing successively after coagulating treatment, after biological nitration processing Waste water filtering after carry out catalytic ozonation processing, obtain recycle-water;Or,
Pending waste water carries out catalytic ozonation processing after coagulating treatment, catalytic ozonation treated waste water successively into The processing of row biological denitrification and biological nitration processing, treated that waste water is filtered for biological nitration, obtains recycle-water;Or,
Pending waste water carries out biological nitration processing and biological denitrification processing, biological denitrification processing successively after coagulating treatment Waste water afterwards carries out catalytic ozonation processing after filtration treatment, obtains recycle-water;
The coagulating treatment is divided into mix stages, flocculated stage and precipitate phase, and the residence time of mix stages is 10~30s, The reaction time of flocculated stage is 15~30min, and the residence time of precipitate phase should be greater than 2h;
Prepositive denitrification bio-filter hydraulic surface loading is 8~10m3/(m2H), denitrification load is 0.8~1.0 (kgNO3 --N)/(m2D), the empty bed residence time is 25~30min;
Rear-mounted denitrification biofilter hydraulic surface loading is 8~12m3/(m2H), denitrification load is 1.5~2.0 (kgNO3 --N)/(m2D), the empty bed residence time is 20~25min;
Nitrification biofilter hydraulic surface loading is 3~5m3/(m2H), nitrification load is 0.6~1.0 (kgNO3 --N)/ (m2D), the empty bed residence time is 40~45min;
The filtering velocity of the filtration treatment is 5~12m3/(m2·h);
The time of the catalytic ozonation processing is more than 5min;
The volumn concentration of the ozone gas used in catalytic ozonation processing, ozone is more than 4%.
15. technique according to claim 14, which is characterized in that the coagulant that the coagulating treatment uses is polyaluminum sulfate In iron, poly-ferric chloride, polyaluminium sulfate, aluminium polychloride or polymeric aluminum sulfate iron any one or at least two group It closes.
16. technique according to claim 14, which is characterized in that before the coagulating treatment, mud is added into comprehensive wastewater Sand.
17. technique according to claim 16, which is characterized in that the dosage of the silt particle be wastewater quality 5~ 20%.
18. technique according to claim 14, which is characterized in that the biological denitrification processing is in denitrification bio-filter Middle progress, the biological nitration processing carry out in nitrifying biofilter.
19. technique according to claim 18, which is characterized in that in the nitrification biofilter and denitrification bio-filter Filtrate be volcanic rock, modified haydite or one kind in coke or at least two combination.
20. technique according to claim 18, which is characterized in that when lacking organic carbon source in pending waste water, to described Organic carbon source is added in denitrification bio-filter.
21. technique according to claim 20, which is characterized in that the organic carbon source added is glucose and/or first Alcohol.
22. technique according to claim 14, which is characterized in that the catalytic ozonation processing is on ozone reactor It carries out.
23. technique according to claim 14, which is characterized in that in the ozone gas used in catalytic ozonation processing The volumn concentration of ozone is more than or equal to 10%.
24. technique according to claim 14, which is characterized in that the time of catalytic ozonation processing is 10~ 25min。
25. technique according to claim 14, which is characterized in that the catalytic ozonation handles the catalyst used and is In activated carbon, zeolite, porous ceramics, diatomite or metal oxide any one or at least two combination.
26. technique according to claim 14, which is characterized in that the filter medium that the filtration treatment uses be cobble, One kind in quartz sand or anthracite or at least two combination.
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