CN104445613A - Mineralized refuse packed bed and wastewater denitrification method - Google Patents
Mineralized refuse packed bed and wastewater denitrification method Download PDFInfo
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- CN104445613A CN104445613A CN201410121990.4A CN201410121990A CN104445613A CN 104445613 A CN104445613 A CN 104445613A CN 201410121990 A CN201410121990 A CN 201410121990A CN 104445613 A CN104445613 A CN 104445613A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
In order to realize low-cost denitrification of nitrogen-containing wastewater and reasonably utilize the mineralized refuse, the invention provides a mineralized refuse packed bed and a method of removing the nitrogen in the nitrogen-containing wastewater based on the mineralized refuse packed bed. The blockage problem of the packed bed is solved by lowering BOD5 in inlet water, cooperation of partial nitrification and the anaerobic ammonia oxidation is realized by an additionally-arranged vent pipe, and the treatment efficiency is guaranteed by use of a thermal insulation layer, so that the mineralized refuse packed bed is a mineralized refuse packed bed which has low energy consumption, low cost and low carbon footprint. Besides, the wastewater denitrification method is a nitrogen-containing wastewater denitrification treatment method.
Description
Technical field
The present invention relates to a kind of mineralized waste bed of packings, and based on the method that the nitrogen in nitrogenous effluent is sloughed by this mineralized waste bed of packings.
Background technology
Nitrogen-containing pollutant comprises itrogenous organic substance, nitrate, nitrite, ammonia nitrogen, and controlling to discharge nitrogen-containing pollutant to natural water is the important means controlling body eutrophication.Chinese Government has carried out strict restriction to the discharge of ammonia nitrogen, the pollutant emission standard relating to ammonia nitrogen limit value has more than 40, industry standard has more than 20, in addition some standards are also had to relate to the control of nitrate nitrogen and nitrite nitrogen, along with the lasting raising of environmental requirement, more standard will be had and relate to nitrate nitrogen and nitrite nitrogen.China's body eutrophication is serious, and wherein exceed standard with ammonia nitrogen again the most serious, polluted by nitrogen situation is very severe.
The existing method of denitrogenation of waste water has physical treatment method, chemical treatment method, bioremediation.
Physical treatment method comprises distillation, stripping, film absorption.Distillation cost is higher, is applicable to ammonia nitrogen concentration higher than 5000mg/L waste water; Stripping belongs to the technology that do not reencourage of country because of its secondary pollution problem; Film absorbs and easily seepage occurs.
Chemical treatment method comprises the struvite precipitator method, break point chlorination method, ion exchange method, electrochemical method etc., chemical precipitation method is not suitable for the waste water containing toxic ingredient, and need to be adjusted to strong basicity environment, often neutrality is adjusted to again when discharge or aftertreatment, its acid and alkali consumption amount is large, limits its industrial application; Break point chlorination method is usually used in the advanced treatment of waste water or the process of tap water, too high for cost for wastewater treatment; Ion exchange method is due to the large usage quantity of ion-exchanger, and regeneration is frequent, and regenerated liquid causes secondary pollution, also limit its application; Electrochemical method energy consumption is large, cost is high, and practical application is fewer.
Biological treatment comprises that nitrated/denitrification, synchronous nitration and denitrification, short-cut nitrification-denitrification are nitrated, Anammox, SHARON-ANAMMOX.
Traditional denitrogenation of waste water usually uses nitrated/denitrification, and nitration reaction is often oxidized 1g ammonia nitrogen needs oxygen consumption 4.57g, consumes basicity 7.14g; Often reduce 1g nitrate nitrogen at denitrification and need consume methyl alcohol 1.91 grams, increase basicity is 3.57g, need when carbon source in waste water is not enough to add the organism such as methyl alcohol, glucose as electron donor, so for low C/N waste water, be that nitrogen needs to consume oxygen 4.57 grams by the mineralized nitrogen of 1g, consume the electron donor 1.94g that methyl alcohol calculates, need in addition to regulate the potential of hydrogen of waste water, its adding of agent expense is huge, adopt nitrated-denitrification process, when considering backflow, processed in units expense is estimated as 17 ~ 33 $/kgN.（Tsushima I,Ogasawara Y,Kindaichi T,et al.Development of high-rate anaerobic ammonium oxidizing (anammox) biofilm reactors[J].Water research,2007,41:1623 –1634）。
Synchronous nitration and denitrification is owing to avoiding NO in nitrifying process
2-and NO
3-accumulation, and nitrated consumption basicity and denitrification produce basicity achieves coupling, have significant advantage than complete nitrification-denitrification.But synchronous nitration-denitrification is very strict to the control of condition, and main at present have application in Western European countries such as Holland, Denmark, Germany, Italy, and domestic application is fewer.
Short-cut nitrification and denitrification is only by NH
4+ be oxidized to nitrite, reduce oxygen and the basicity of needs, also reduce the organism required for denitrification simultaneously, thus reduce cost.The accumulation of nitrite is the key of this technology, but industrially at present realizes nitrite to stablize the example of accumulation also fewer.
Nitration-anaerobic ammoxidation is by the ammonium oxidation of a part to nitrate, and nitrate and ammonia nitrogen generate nitrogen under the effect of anaerobic ammonium oxidizing bacteria.The eighties in 20th century has found the phenomenon of Anammox, and Holland has realized its industrial application.The technical difficult points of this technology is that Anammox bacterial classification source is deficient, thalline value-added speed is slow, anaerobic ammonium oxidizing bacteria easily runs off.
First part ammonium oxidation is become nitrite by SHARON-ANAMMOX technique, and nitrite and remaining mineralized nitrogen are nitrogen by anaerobic ammonium oxidizing bacteria.It is nitrite that this technique only needs the ammonium oxidation of part, and oxygen and basicity consumption are little, and the Anammox stage does not need carbon source, has good economy for low C/N waste water.Because this process control condition is strict and complicated, require much skill level, so industrial application is still not extensive at present.The core of this technique is biological propagation and maintenance in the accumulation of nitrite and anaerobic ammonia oxidation reactor, usually adopt perfectly mixed reactor to realize the accumulation of nitrite, adopt UASB (up-flow anaerobic sludge blanket), AF(anaerobic filter) or both reactors of combining realize propagation and the maintenance of anaerobic ammonium oxidizing bacteria.Adopt these implementations, realize the removal of nitrogen, the ammonia nitrogen of waste water at least half need be converted into nitrite nitrogen in theory, and the restraining effect of nitrous acid to microorganism is larger, adopt this art breading as the higher waste water of the ammonia nitrogen concentrations such as percolate, refinery water, waste water of livestock poultry, due to the accumulation of nitrite, easily Product inhibiton is caused to nitrosation reaction; Enter into the Anammox stage, cause substrate to suppress again to anaerobic ammonium oxidizing bacteria, so in the higher occasion of concentration, this is the contradiction being difficult to for a pair be in harmonious proportion.In addition, the doubling time of anaerobic ammonium oxidizing bacteria reaches 11 days, so for anaerobic ammonia oxidation reactor, sludge retention time is almost that the longer the better, technique means is often adopted to realize being separated of hydraulic detention time and sludge retention time, the means such as the solid-liquid separation capability of such as microbial film, anaerobic membrane bioreactor, raising upflow type anaerobic reactor realize, and achieve good effect.But be limited by the speed of growth slow, the initial failure period of reactor is general all very long, has a lot of documents to describe cultural method comparatively fast at present, but there is not been reported to be applied to the fast culture process of engineering.
Since the nineties in last century, Tongji University Zhao is by just proposing the new approaches adopting mineralized waste to carry out purification of waste water as filler in a creative way, under the support of multiple funds such as National 863 plan, the systematic research technical staple of the multiclass waste water such as mineralized refuse bioreactor process landfill percolate, city domestic sewage, waste water of livestock poultry, coking chemical waste water, phenolic wastewater, dyeing waste water, coking chemical waste water.Tongji University discloses a kind for the treatment of process of diffusion water of garbage burying ground in " a kind for the treatment of process of diffusion water of garbage burying ground " that the application number that on November 7th, 2000 applies for is 00127298.5, as a kind of pioneer invention, this invention has inspired the research of domestic a lot of employing mineralized waste as filler process waste water, but as early stage achievement, also exist reactor plugs, efficiency lower, be not suitable with the problems such as winter climate.East China Normal University is the biological denitrification method disclosing a kind of middle mature landfill leachate in the prospectus of " biological denitrification method of middle mature landfill leachate and the device " of 201110260863.9 at the application number that on September 5th, 2011 applies for, at pretreatment stage, the ammonia nitrogen of part in waste water is disposablely oxidized to nitric nitrogen or nitrite nitrogen, afterwards again in anaerobic ammonia oxidation reactor by ammonia nitrogen and NO
x-remove together.The method first by the filler of stale garbage effect anaerobic ammonia oxidation reactor, and obtains certain treatment effect.But remain in following defect: in due to waste water, ammonia nitrogen concentration is up to 2000mg/L, the ammonia nitrogen in Anammox stage be enable all to be removed by Anammox reaction, then at least need the ammonium oxidation of 1000 mg/L to become NO
x-, this will cause higher nitrite accumulation, consume a large amount of basicity simultaneously and cause pH to decline, and both actings in conjunction cause serious substrate to suppress by Anammox reaction; The Anammox stage needs again to produce a large amount of basicity simultaneously, makes the pH bottom anaerobic ammonia oxidation reactor higher, equally also affects efficiency and the stability of anaerobic ammonia oxidation reactor; BOD in waste water
5concentration is higher, heterotrophic microorganism and autotrophic microorganism in pre-treatment mineralized waste bed is formed and competes, and because nitrobacteria, anaerobic ammonium oxidizing bacteria are all autotrophic bacterias, its growth is suppressed; Meanwhile, the breeding of a large amount of heterotrophic microorganism makes filler block, and needs irregular dredging, reduces operational efficiency and treatment effect; In addition, owing to not adopting insulation and heating measures, must run under the environment that temperature is higher, limit the application of this technology.
Summary of the invention
In order to solve the problem, the invention provides a kind of mineralized waste bed of packings that can carry out denitrogenation processing to nitrogenous effluent.
This mineralized waste bed of packings comprises supporting layer and is positioned at the packing area on supporting layer, is mineralized waste filler, arranges the vent-pipe of horizontal direction in described packing area in packing area.
Described horizontal ventilation pipe can be the vent-pipe of porous surface, also can be the vent-pipe having multiple outlet.Described horizontal ventilation pipe has multilayer, is interrupted arrangement in vertical direction.The described vent-pipe number of plies is in vertical direction 1-5 layer, is preferably layer 2-4, is more preferably 3 layers.Distance between two-layer vent-pipe is 0.5m-1.5m, is preferably 0.7m-1.3m, is more preferably 0.9m-1.1m; The upper surface 0.1m-0.5m of the superiors' vent-pipe distance mineralized waste filler, is preferably 0.2m-0.4m, is more preferably 0.3m.Operationally, the air transporting arrangements such as the external air compressor of vent-pipe, gas blower, carry oxygen-containing gas, as air, oxygen, make to become aerobic environment near vent-pipe in bed of packings.Transfer pressure is normal pressure to 1500 handkerchief malleation, and concrete numerical value changes along with the distance between vent-pipe, and the numerical value of pressure should make to there is certain thickness anaerobism or the environment close to anaerobism between two-layer vent-pipe.Therefore, in mineralized waste bed of packings, anaerobic zone and aerobic zone are alternately arranged in vertical direction, and its quantity sum is 2-10 layer.
In order to improve invention further, solve prior art problem, the present invention is based on foregoing invention, and also provide a kind of mineralized waste bed of packings, the outer wall of its bed of packings is provided with thermal insulation layer.This thermal insulation layer is lagging material or can heating material, and described thermal insulation layer, when mineralized waste bed of packings works, maintains mineralized waste filler temperature at 20 DEG C-40 DEG C, is preferably 30 DEG C-37 DEG C, is more preferably 33 DEG C-37 DEG C, most preferably is 35 DEG C.
Above-mentioned arbitrary mineralized waste bed of packings, need tame when bringing into use.
Based on above-mentioned arbitrary mineralized waste bed of packings, the present invention also provides a kind of method of being sloughed by the nitrogen in nitrogenous effluent.Particularly, be applicable to the waste water of total nitrogen concentration 100-5000mg/L, comprise following steps:
Step one: carry out pre-treatment to waste water, makes the BOD in waste water
5lower than 200mg/L, temperature is 20-40 DEG C, and pH value is 6.6-9;
Step 2: by waste water good for pre-treatment from sprinkle above above-mentioned arbitrary mineralized waste bed of packings.
Under situation in need, time as higher in influent concentration, the water of step 2 process gained can be back to step one, carry out reprocessing.
In order to improve invention further, solve prior art problem, the present invention is based on foregoing invention, a kind of method of being sloughed by the nitrogen in nitrogenous effluent is also provided, namely before waste water sprinkle, in waste water, add nutritive substance, bed of packings inside can be entered along with waste water sprinkle.The effective constituent of described nutritive substance is trace element, yeast extract and phosphorus containg substances, and described trace element is one or more in Fe, K, Mg, Cu, Co, Ni, Mo, Mn.Operationally, the air transporting arrangements such as the external air compressor of vent-pipe, gas blower, carry oxygen-containing gas, as air, oxygen, make to become aerobic environment near vent-pipe in bed of packings.Transfer pressure is normal pressure to 1500 handkerchief malleation, and concrete numerical value changes along with the distance between vent-pipe, and the numerical value of pressure should make to there is certain thickness anaerobism or the environment close to anaerobism between two-layer vent-pipe.When mineralized waste bed of packings works, maintain mineralized waste filler temperature at 20 DEG C-40 DEG C, be preferably 30 DEG C-37 DEG C, be more preferably 33 DEG C-37 DEG C, most preferably be 35 DEG C.
In order to implement foregoing invention better, the mineralized waste filler in described mineralized waste bed of packings is by mineralized waste sorting removing glass, metal, plastics, sieves the material that the particle diameter obtained is less than 30mm after hazardous and noxious substances.Described mineralized waste is domestic refuse or take biomass as the material of main component, landfill or pile up the soil shape material formed for more than 5 years in physical environment.
The present invention also can by containing NO
xgas or waste gas import to mineralized waste packing area, to promote the generation of mineralized waste packing area Anammox reaction, and play simultaneously and remove NO in waste gas
xobject.Containing CO
2waste gas or gas also can import to mineralized waste packing area to promote the generation of nitrated, nitrosification, Anammox reaction.
Mineralized waste bed of packings provided by the invention, the collaborative of short distance nitration-anaerobic ammoxidation can be achieved in same reactor, whole process only adds a small amount of soda acid to regulate initial pH value, do not add organic carbon source, and aeration rate needed for this process is considerably less, technique is simple, is the mineralized waste bed of packings of nitrogenous effluent denitrogenation of a kind of less energy-consumption, low cost, low-carbon (LC) footprint.
Contain at the same time in the waste water of organism and ammonia nitrogen, heterotrophic microorganism and autotrophic microorganism form competitive relation, and heterotrophic microorganism generally occupies competitive edge.The present invention, from sludge yield, proposes the supposition of sludge bulking blocking and verifies.The present invention reduces the organic content in waste water by pre-treatment, preventing the transition of microorganism to breed causes bed of packings to block, prevent the amount reproduction of heterotrophic microorganism and autotrophic microorganism to compete simultaneously, the autotrophic microorganism in aged refuse reactor is made to obtain growth and living environment preferably, anaerobic ammonium oxidizing bacteria autotroph is occupied an leading position, and improves the efficiency of reaction bed nitration reaction and Anammox reaction in this way.
The invention provides a kind of approach of mineralized waste resource utilization, be conducive to the recycle of refuse landfill, significant to urban sustainable development.
Accompanying drawing explanation
Fig. 1 is the front view of mineralized waste bed of packings in the present invention.
Fig. 2 is the side-view of mineralized waste bed of packings in the present invention.
Embodiment
In order to better the present invention is described, introduce the specific embodiment of the present invention in conjunction with Figure of description.
In accompanying drawing, 1 is water distributor, and 2 is mineralized waste filler, and 3 is reaction bed bed wall, 4 is supervisor of ventilating, and 5 is branch vent, and 6 is thermal insulation layer, 7 is supporting layer, and 101 for dispensing in the waste water above mineralized waste bed of packings, and 102 is the gas importing to mineralized waste packing area.
Embodiment 1.
Water inlet character: coking chemical waste water, ammonia-nitrogen content 1433 ~ 2134 mg/L, COD are 1577 ~ 2544 mg/L, BOD
5be 574 ~ 763 mg/L, pH be 10.5 ~ 11.3.
Pre-treatment: adopt activated sludge process by BOD
5be reduced to 25-51 mg/L, the pH regulating waste water is 7.8-8.9, adopts dividing wall type well heater 20-40 DEG C, obtains waste water 101.
Mineralized waste bed of packings: mineralising rubbish filler 2 is obtain brown chessom shape material after the landfill domestic waste of 8 years removes macrobead glass, battery remaining excess, metal, stone after 30mm screening.The high 3.5m of mineralized waste bed of packings bed wall 3, inside establish 4 aerobic zones, 3 anaerobic zones, anaerobic zone and aerobic zone are arranged alternately.Aerobic zone bottom bed of packings is realized by natural ventilation, the formation of all the other 3 aerobic zones is by arranging that individual layer caliber is the porous venting pipe realization of 25mm, ventilation supervisor 4 connects gas blower, imports the air 102 of the malleation about maintenance 1000 handkerchief, enters branch vent 5.The vent-pipe of the superiors is apart from surperficial 0.3m, and second layer vent-pipe is 1m below the superiors' vent-pipe, and third layer vent-pipe is 1m below second layer vent-pipe.Rubbish bed of packings internal surface lays lagging material 6, maintains the temperature of mineralized waste filler at 30 ± 2 DEG C.Evenly spread is on the top of bed of packings for waste water 101, and under gravity successively by aerobic zone and anaerobic zone, the water outlet of aged refuse reactor does not reflux.First with clear water washing before startup, hydraulic load 12m/d, washs one day.5g yeast extract, 3g FeCl is added according to every cubic metre of mineralized waste filler after having washed
2, 1g KCl, 3g MgSO
47H
2o, 1g CuSO45H
2o, 1g CoCl
2, 1g NiCl
2, 1g Na
2moO
42H
2o, 1g MnCl
24H
2o, above-mentioned nutritive substance is mixed with dissolution homogeneity and dispenses in bed of packings upper surface.This nutritive medium adds in mineralized waste bed of packings according to frequency once of each season.
The domestication of mineralized waste bed of packings: add the coking chemical waste water of 10% when domestication starts in tap water, keep hydraulic load 3m/d, run one week, then the concentration of intaking is improved according to the gradient of 20%, 20%, 20%, 30%, after increasing concentration, water outlet COD there will be short period of time rising, can reduce gradually and tend towards stability afterwards, stable effluent quality be a stage domestication successfully mark, the time in one to two weeks of general experience.Through the domestication of 57 days in the present embodiment, domestication terminates substantially, and water outlet ammonia nitrogen is 223-407mg/L lower than 15mg/L, COD.
Treatment effect: when reaction bed temperature is lower than 20 DEG C, whole reaction bed processing efficiency obviously declines, and water outlet ammonia nitrogen is even more than 100 mg/L; Reaction bed temperature, at 20-40 DEG C, can normally be run, and water outlet ammonia control is within 100 mg/L.
Reaction bed temperature is at 35 ± 2 DEG C, and outlet effect is best, when hydraulic surface loading is 1.5m/d, water outlet ammonia-nitrogen content is lower than 15mg/L, and the overwhelming majority time is 178 ~ 341mg/L lower than 10 mg/L, COD, nitrate content is lower than 30mg/L, and nitrite content is lower than 10mg/L.When hydraulic surface loading is 3m/d, water outlet ammonia-nitrogen content is 223-407 mg/L lower than 15 mg/L, COD, and nitrate content is lower than 30mg/L, and nitrite content is lower than 10mg/L.
Will containing NO
x(0.05 ~ 0.1%) and CO
2the mixed gas of (2 ~ 8%) introduces bed of packings by the vent-pipe 4 of aerobic layer, collects mineralized waste bed of packings expellant gas, NO in the gas of collection
xlower than 5mg/m
3, reach more than 99% according to material balance clearance; CO
2concentration is reduced to less than 1%, removes reach more than 80% according to material balance.From the results of view, CO
2be make use of as inorganic carbon source by nitrobacteria.
Embodiment 2.
Influent quality: the middle aged percolate from garbage filling field in 8 years ages of landfill, COD is 1834 ~ 2433mg/L, and ammonia nitrogen is 2430 ~ 3071mg/L, BOD
5be 244 ~ 336mg/L, pH value is 7.4 ~ 8.5.
Pre-treatment: by Fenton oxidation, BOD
5be reduced to 87 ~ 200 mg/L, add soda ash and make the pH of waste water be 8.0-8.8, regulating temperature to be 30 ± 2 DEG C by being directly filled with high-temperature steam, obtaining waste water 101.
Mineralized waste bed of packings: mineralising rubbish filler 2 is the brown chessom shape material obtained after the landfill domestic waste of 10 years removes macrobead glass, battery remaining excess, metal, stone after the screening of 10mm sieve.The high 2m of mineralized waste bed of packings bed wall 3, inside establish 2 aerobic zones, 1 anaerobic zone, anaerobic zone and aerobic zone are arranged alternately.Aerobic zone bottom bed of packings is realized by natural ventilation, and the formation of aerobic zone, top is by arranging that individual layer caliber is the porous venting pipe realization of 25mm, and ventilation supervisor 4 connects gas blower, imports the air 102 of the malleation about maintenance 1000 handkerchief, enters branch vent 5.The vent-pipe of the superiors is apart from surperficial 0.3m.Rubbish bed of packings internal surface lays lagging material 6, and holding temperature is at 30 ± 2 DEG C.Evenly spread is on the top of bed of packings for waste water 101, and under gravity successively by aerobic zone and anaerobic zone, before the effluent recycling of aged refuse reactor to pretreatment temperature regulating step, reflux ratio is 1.First with clear water washing before startup, hydraulic load 12m/d, washs one day.5g yeast extract, 3g FeCl is added according to every cubic metre of mineralized waste filler after having washed
2, 1g KCl, 3g MgSO
47H
2o, 1g CuSO45H
2o, 1g CoCl
2, 1g NiCl
2, 1g Na
2moO
42H
2o, 1g MnCl
24H
2o, above-mentioned nutritive substance is mixed with dissolution homogeneity and dispenses in bed of packings upper surface.This nutritive medium adds in mineralized waste bed of packings according to frequency once of each season.
The domestication of mineralized waste bed of packings: add the percolate of 10% when domestication starts in tap water, keep hydraulic load 3m/d, run one week, then the concentration of intaking is improved according to the gradient of 20%, 20%, 20%, 20%, 10%, after increasing concentration, water outlet COD there will be short period of time rising, can reduce gradually and tend towards stability afterwards, stable effluent quality be a stage domestication successfully mark.This project was through the domestication of 85 days, and domestication terminates substantially, and water outlet ammonia nitrogen is 155-405mg/L, BOD lower than 15mg/L, COD
5for 15-33mg/L.
Treatment effect: when reflux ratio is 1, when mineralized waste bed of packings hydraulic surface loading is 3m/d, water outlet ammonia-nitrogen content is 155-405mg/L, BOD lower than 15 mg/L, COD
5for 15-33mg/L, nitrate content is lower than 25mg/L, and nitrite content is lower than 15mg/L.
Embodiment 3.
Water inlet character: pig farm breeding wastewater, ammonia-nitrogen content 209-1100 mg/L, COD are 847 ~ 1544 mg/L, BOD
5be 363 ~ 758 mg/L, pH be 7.1 ~ 7.6.
Pre-treatment: adopt activated sludge process, water outlet BOD
5for 45-96 mg/L, pH are 6.9-7.3, ammonia-nitrogen content is 247-683 mg/L.
Mineralized waste bed: mineralising rubbish filler 2 is the brown chessom shape material obtained after the landfill domestic waste of 10 years removes macrobead glass, battery remaining excess, metal, stone after the screening of 10mm sieve.The high 2m of mineralized waste bed of packings bed wall 3, inside establish 2 aerobic zones, 1 anaerobic zone, anaerobic zone and aerobic zone are arranged alternately.Aerobic zone bottom bed of packings is realized by natural ventilation, and the formation of aerobic zone, top is by arranging that individual layer caliber is the porous venting pipe realization of 25mm, and ventilation supervisor 4 connects gas blower, imports the air 102 of the malleation about maintenance 1000 handkerchief, enters branch vent 5.The vent-pipe of the superiors is apart from surperficial 0.3m.Rubbish bed of packings internal surface lays lagging material 6, and holding temperature is at 30 ± 2 DEG C.Evenly spread is on the top of bed of packings for waste water 101, and under gravity successively by aerobic zone and anaerobic zone, before the effluent recycling of aged refuse reactor to pretreatment temperature regulating step, reflux ratio is 1.First with clear water washing before startup, hydraulic load 12m/d, washs one day.5g yeast extract, 3g FeCl is added according to every cubic metre of mineralized waste filler after having washed
2, 1g KCl, 3g MgSO
47H
2o, 1g CuSO45H
2o, 1g CoCl
2, 1g NiCl
2, 1g Na
2moO
42H
2o, 1g MnCl
24H
2o, above-mentioned nutritive substance is mixed with dissolution homogeneity and dispenses in bed of packings upper surface.This nutritive medium adds in mineralized waste bed of packings according to frequency once of each season.
The domestication of mineralized waste bed of packings: add the percolate of 10% when domestication starts in tap water, keep hydraulic load 3m/d, run one week, then the concentration of intaking is improved according to the gradient of 20%, 20%, 20%, 20%, 10%, after increasing concentration, water outlet COD there will be short period of time rising, can reduce gradually and tend towards stability afterwards, stable effluent quality be a stage domestication successfully mark.This project was through the domestication of 85 days, and domestication terminates substantially, and water outlet ammonia nitrogen is 155-405mg/L, BOD lower than 15mg/L, COD
5for 15-33mg/L.
Treatment effect: water outlet ammonia nitrogen lower than 30mg/L, COD lower than 200mg/L.
The present invention includes but be not limited to the content of above-described embodiment, those skilled in the art do usual variation to the present invention, also belong to protection scope of the present invention.
Claims (20)
1. a mineralized waste bed of packings, comprises the packing area being filled with mineralized waste filler, it is characterized in that: the vent-pipe arranging horizontal direction in described packing area.
2. mineralized waste bed of packings as claimed in claim 1, is characterized in that: described horizontal ventilation pipe has multilayer, is interrupted arrangement in vertical direction.
3. mineralized waste bed of packings as claimed in claim 2, is characterized in that: the described vent-pipe number of plies is in vertical direction 1-5 layer, is preferably layer 2-4, is more preferably 3 layers.
4. mineralized waste bed of packings as claimed in claim 3, is characterized in that: the distance between two-layer vent-pipe is 0.5m-1.5m, is preferably 0.7m-1.3m, is more preferably 0.9m-1.1m; The upper surface 0.1m-0.5m of the superiors' vent-pipe distance mineralized waste filler, is preferably 0.2m-0.4m, is more preferably 0.3m.
5. the mineralized waste bed of packings as described in claim as arbitrary in Claims 1-4, is characterized in that: described vent-pipe is the vent-pipe of porous surface.
6. the mineralized waste bed of packings as described in claim as arbitrary in Claims 1-4, is characterized in that: the outer wall of described packing area is provided with thermal insulation layer.
7. mineralized waste bed of packings as claimed in claim 6, is characterized in that: described thermal insulation layer is lagging material or can heating material.
8. mineralized waste bed of packings as claimed in claim 1, is characterized in that: described mineralized waste filler is the material that will sieve the particle diameter obtained after mineralized waste sorting removing glass, metal, plastics, hazardous and noxious substances and be less than 30mm.
9. mineralized waste bed of packings as claimed in claim 8, is characterized in that: described mineralized waste is domestic refuse or take biomass as the material of main component, landfill or pile up the soil shape material formed for more than 5 years in physical environment.
10. based on a denitrogenation of waste water method for the mineralized waste bed of packings described in above-mentioned arbitrary claim, it is characterized in that: the external air transporting arrangement of described vent-pipe, delivering gas in bed of packings, evenly dispenses in waste water above mineralized waste bed of packings.
11. denitrogenation of waste water methods as claimed in claim 10, is characterized in that: the waste water dispensed in above mineralized waste bed of packings is BOD
5lower than 200mg/L, temperature is 20-40 DEG C, and pH value is the waste water of 6.6-9.
12. denitrogenation of waste water methods as claimed in claim 11, is characterized in that: the waste water total nitrogen concentration used is 100-5000mg/L.
13. denitrogenation of waste water methods as claimed in claim 10, is characterized in that: described gas comprises oxygen-containing gas.
14. denitrogenation of waste water methods as claimed in claim 13, is characterized in that: described gas also comprises containing NO
x, CO
2in one or more waste gas or gas.
15. denitrogenation of waste water methods as described in claim 10,13 or 14, is characterized in that: described transfer of gas pressure is normal pressure to 1500 handkerchief malleation, make to there is certain thickness anaerobism or the environment close to anaerobism between two-layer vent-pipe.
Denitrogenation of waste water method as described in 16. claims as arbitrary in claim 10 to 15, is characterized in that: needing to add nutritive substance, along with waste water sprinkle enters bed of packings inside in waste water to be processed.
17. denitrogenation of waste water methods as claimed in claim 16, is characterized in that: the effective constituent of described nutritive substance is trace element, yeast extract and phosphorus containg substances.
18. mineralized waste bed of packings as claimed in claim 17, is characterized in that: described trace element is one or more in Fe, K, Mg, Cu, Co, Ni, Mo, Mn.
Denitrogenation of waste water method as described in 19. claims as arbitrary in claim 10 to 18, is characterized in that: described return of waste water after the process of mineralized waste bed of packings.
20. denitrogenation of waste water methods as described in claim arbitrary in claim 10 to 19, it is characterized in that: described mineralized waste bed of packings in the course of the work, maintains mineralized waste filler temperature at 20 DEG C-40 DEG C, is preferably 30 DEG C-39 DEG C, be more preferably 33 DEG C-37 DEG C, most preferably be 35 DEG C.
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