A kind of processing method of landfill leachate
Technical field
The present invention relates to waste disposal method more particularly to a kind of processing methods of landfill leachate.
Background technique
Landfill leachate refers to the moisture that rubbish itself contains in refuse landfill, the sleet water into landfill yard
And other moisture, the saturation moisture capacity of rubbish, overburden layer is deducted, and undergo waste layer and overburden layer and a kind of high concentration for being formed
Waste water.Landfill leachate has the characteristics that be different from general municipal sewage: pollutant concentration is high, some landfill percolates
COD, ammonia nitrogen concentration can be up to nearly 100,000, nearly ten thousand mg/L respectively.There are three the most prominent features of percolate: first is that ammonia nitrogen concentration
Height has inhibiting effect to the breeding and growth of microorganism;Second is that the concentration of phosphorus is low;Third is that water quality is in aperiodicity change, and become
Change amplitude is big, is difficult to adapt to wastewater treatment equipment.It is the simplest method by landfill leachate and municipal sewage merging treatment,
But landfill yard is typically remote from cities and towns, therefore its percolate and municipal sewage merging treatment have certain specific difficulty, often not
It obtains and oneself does not handle individually.The processing of city refuse landfill landfill leachate is always in Landfill Site Design, operation and management
Very stubborn problem.Landfill leachate is product of the liquid in landfill yard gravity flowing, is mainly derived from precipitation and rubbish sheet
Body it is interior aqueous.Since liquid may influence in many of flow process factor the property of percolate, including physical factor,
Chemical factor and biological factor etc., so the property of percolate changes in a sizable range.In general, pH
Value between 4~9, COD in the range of 4000~100000mg/L, BOD5 from 200~10000mg/L, heavy metal concentration and
The concentration of heavy metal is almost the same in municipal wastewater.City refuse landfill landfill leachate is a kind of high concentration of complicated component
If organic wastewater is directly discharged into environment untreated, will cause serious environmental pollution.For the purpose of protecting environment, to infiltration
It is essential that filtrate, which carries out processing,.
Existing method for treating garbage percolation liquid is broadly divided into bioanalysis, physico-chemical process and land law three categories.Biological treatment
Anaerobic Treatment has up-flow anaerobic sludge blanket UASB, anaerobic baffled reactor ABR, anaerobic pond, EGSB, IC etc. in method;It is aerobic
Processing has the aerobic aeration pool, activated sludge process, biological rotating disk and trickling filter etc., anaerobic/aerobic (A/O) mixed processing.Physico-chemical process
Mainly there are chemical coagulation and precipitation, activated carbon adsorption, chemical oxidation, catalysis oxidation, film process etc..Land treatment systems such as artificial swamp etc.
Mainly by the filtering of soil particle, ion-exchange absorption echos precipitating etc..The high-concentration ammonia nitrogenous wastewater of landfill leachate, discharge amount
Greatly, complicated component, strong toxicity is big to environmental hazard, and processing difficulty is again very big, so that the pollution and its improvement of ammonia nitrogen waste water are always
Great attention by whole world environment protection field.The extremely strong landfill leachate of the pollution generated during garbage loading embeading is easily
Lower infiltration polluted underground water, karst landform especially special with Southwestern China area, Groundwater ecological environment frailty, local resident
Drinking water source is mostly underground water, if significant damage can be brought to ecological environment and human health by dealing with improperly, therefore rubbish seeps
One of the difficult point for very urgently having become current home and abroad environment engineering field is effectively treated in filtrate.Country props up energetically in recent years
Environmental protection industry is held, resident increases accordingly environmental requirement with the improvement of people ' s living standards, and Design of Waste Landfill Site scheme must
It must optimize, create and the landfill yard of reorganization and expansion will execute discharge standard with GB16889-2008.
Recent years, a kind of new CANON technique (Completely autotrophic ammoni-um removal
Over nitrite, autotrophic denitrification technique in biomembrane) it is used for the processing of percolate from garbage filling field, obtain processing effect well
Fruit.CANON technique is a kind of Process of Biological Nitrogen Removal, which refers to passes through control in single reactor or biomembrane
Dissolved oxygen realizes nitrosation and Anammox, to achieve the purpose that denitrogenation.Under micro-oxygen conditions, Nitrosomas is by ammonia nitrogen portion
Divide and is oxidized to nitrous acid, anaerobic environment needed for ANAMMOX process is created in consumption oxidation;The nitrous acid of generation and some residual
Ammonia nitrogen occurs ANAMMOX reaction and generates nitrogen, and the stoichiometric equation of CANON process is as follows: nitrosation: 1NH+1.5O2 →
1NO+H+H2O
ANAMMOX:1NH3+1.32NO+H → 1.02N2+0.26NO+2H2O
CANON:1NH+0.85O2 → 0.435N2+0.13NO+0.14H+1.3H2O
From reaction formation, CANON technique is the combination of SHARON technique and ANAMMOX technique.The control of CANON technical process
System, be first reach dynamic equilibrium between aerobic ammonia oxidation and Anammox to be realized, and anaerobic ammonia oxidizing bacteria growth rate it is slow,
Doubling time is long, once growing environment is destroyed, it is necessary to and long time could restore;DO and ASL is two masters simultaneously
The control parameter wanted, for the stability for keeping sludge, it should avoid the excessive concentration of O2 and NO2-N, this can be by controlling oxygen
Change reduction potential and DO concentration to realize.CANON technique due to being not necessarily to additional organic carbon source substance in the process of running, to have
Effect is overcome traditional nitrification-denitrification process requirement and is supported denitrifying problem using organic matter as electron donor, can be saved
100% carbon source is particularly suitable for handling the high-concentration ammonia nitrogenous wastewater of low C/N;Since the technique is using restricted oxygen supply
Mode, DO concentration is lower in reactor, can save 60% aeration consumption;The technique can complete NH-N extremely in a reactor
N2's is totally converted process, so that the process of biological removal of nitrogen is very brief, corresponding construction, operation, administration fee are also expected to greatly
Width reduces.
But since refuse landfill landfill leachate is complex in composition, CANON technical face is to capricious, high ammonia nitrogen
Landfill leachate, or not therefore design requirement is often not achieved in treatment effect to the stability of processing.
Summary of the invention
It is an object of the invention to complex in composition, the CANON technical faces in order to solve conventional garbage Landfill Leachate
To capricious, high ammonia nitrogen landfill leachate, or not therefore design requirement is often not achieved in treatment effect to the stability of processing
Defect and provide it is a kind of the landfill leachate of complex in composition, capricious refuse landfill can be carried out stablizing processing, reach
Mark the processing method of the landfill leachate of discharge.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of processing method of landfill leachate, the treating method comprises following steps:
Step 1: landfill leachate treatment material, and and stone is made in cinder, flyash and chitin mixture modified
Ash is poured into together in landfill leachate neutralization pond;
Step 2: will treated that landfill leachate send carries out deamination reaction to Ammonia blowing-out tower through step 1;
Step 3: anaerobic pond will be imported through step 2 treated landfill leachate;
Step 4: will import SBR runoff investigation pond through step 3 treated landfill leachate, with being pumped to sbr reactor in parallel
Biological respinse is carried out in pond;
Step 5: will import coagulating basin through step 4 treated landfill leachate, addition composite inorganic flocculant and be compounded with
The reaction of machine flocculant;The sludge that coagulating basin generates burns after concentrating.
Preferably, the mass ratio of cinder, flyash and chitin modified is 3-5: 2-3: 1;Landfill leachate
The mass ratio for handling material and lime is 3: 1.
Preferably, composite inorganic flocculant described in step 5, additive amount 1-5wt%, consisting of atlapulgite: pottery
Grain: waste slag of electrolytic aluminium: the composition of ferric trichloride, atlapulgite: haydite: waste slag of electrolytic aluminium: the mass ratio of ferric trichloride is 5: 3
∶1∶1.3。
Preferably, step 5 adds the compound organic flocculant formed based on polyacrylamide in coagulating basin, add
Dosage 2-3wt%, formula are as follows: anion-polyacrylamide 40wt%-70wt%, Powdered Activated Carbon 25wt%-55wt%,
Chitosan 1wt%-5wt%.
Preferably, the operation program in the parallel connection sbr reactor pond are as follows: water inlet 45~50min → 9~12h of aeration → heavy
Shallow lake 60min → draining 60min, spoil disposal after drained water, each spoil disposal are the 1/10 of total inflow, and sludge age is 20~30d, are transported daily
2~3 periods of row.
Preferably, the modified chitin uses following technique to prepare: by 20-35 parts of deacetylations for 35-45%'s
Chitin is added the sodium hydroxide solution that 100-140 parts of concentration are 2.5-3.5mol/L and impregnates 1-3 days, filters, washing, is added double
The bleaching of oxygen water, is filtered, and is washed, dry, and 1-3 parts of epoxy bromopropanes, 0.05-0.09 parts of maleic anhydrides, 0.5-0.9 parts of front threes are added
Amine aqueous solution, 0.001-0.003 part azodiisobutyronitrile and 0.01-0.05 parts of tetrabutylammonium bromide stirred under pressure, mixing speed
For 400-700r/min, whipping temp is 150-170 DEG C, mixing time 15-35min, and spray drying obtains modified crust
Element.
Preferably, the anaerobic pond uses common anaerobic nitrification, 35 DEG C, load is 1kgCOD/ (m3D), it stops
Time 10d.
Compared with prior art the beneficial effects of the present invention are: due to above-mentioned technical proposal of the invention, use inorganic
Flocculant and organic flocculant, inorganic flocculating agent are the composite inorganic flocculants formed based on atlapulgite, and having reduces water
The flocculant of the water process of middle ammonia nitrogen denitrogenation and can be such that suspended matter precipitates;Organic flocculant is based on polyacrylamide
The compound organic flocculant of composition, anionic polyacrylamide form insoluble sediment in conjunction with heavy metal ion, are formulated
Middle chitosan is a kind of anionic polymer flocculant, has charge neutrality effect, adsorption bridging effect and metal-chelating effect.Shell
Glycan is compound with active carbon, forms chemistry between anionic chitosan and porous active carbon and builds bridge, neutralizes and reduce colloid
The charge on surface, facilitates elimination of colloid stability;This formula has the function of reducing heavy metal ion and other pollutants in water.This hair
It is bright that the landfill leachate of complex in composition, capricious refuse landfill can be carried out stablizing processing, qualified discharge.
Specific embodiment
Below in conjunction with specific embodiment, the present invention will be further explained:
Embodiment 1
A kind of processing method of landfill leachate, the treating method comprises following steps:
Step 1: landfill leachate treatment material, and and stone is made in cinder, flyash and chitin mixture modified
Ash is poured into together in landfill leachate neutralization pond;The mass ratio of cinder, flyash and chitin modified is 3: 2: 1;Rubbish
It is 3: 1 that rubbish percolate, which handles material and the mass ratio of lime,;The modified chitin is prepared using following technique: by 20 parts of de- second
The chitin that acyl degree is 35% is added the sodium hydroxide solution that 100 parts of concentration are 2.5mol/L and impregnates 1 day, filters, washs, is added
Hydrogen peroxide bleaching filters, and washs, dry, be added 1 part of epoxy bromopropane, 0.05 part of maleic anhydride, 0.5 part of trimethylamine aqueous solution,
0.001 part of azodiisobutyronitrile and 0.01 part of tetrabutylammonium bromide stirred under pressure, mixing speed 400r/min, whipping temp are
150 DEG C, mixing time 15min, spray drying obtains modified chitin;
Step 2: will treated that landfill leachate send carries out deamination reaction to Ammonia blowing-out tower through step 1;
Step 3: anaerobic pond will be imported through step 2 treated landfill leachate;Anaerobic pond use common anaerobic nitrification, 35
DEG C, load is 1kgCOD/ (m3D), residence time 10d;
Step 4: will import SBR runoff investigation pond through step 3 treated landfill leachate, with being pumped to sbr reactor in parallel
Biological respinse is carried out in pond;The operation program in sbr reactor pond in parallel are as follows: water inlet 45min → aeration 9h → precipitating 60min → draining
60min, spoil disposal after drained water, each spoil disposal are 1/10, sludge age 20d of total inflow, run 2 periods daily;
Step 5: will import coagulating basin through step 4 treated landfill leachate, addition composite inorganic flocculant and be compounded with
The reaction of machine flocculant;The sludge that coagulating basin generates burns after concentrating;The composite inorganic flocculant, additive amount 1wt%, composition
For atlapulgite: haydite: waste slag of electrolytic aluminium: the composition of ferric trichloride, atlapulgite: haydite: waste slag of electrolytic aluminium: ferric trichloride
Mass ratio be 5: 3: 1: 1.3;Compound organic flocculant, additive amount 2wt%, formula are as follows: anion-polyacrylamide
40wt%, Powdered Activated Carbon 55wt%, chitosan 5wt%.
Embodiment 2
A kind of processing method of landfill leachate, the treating method comprises following steps:
Step 1: landfill leachate treatment material, and and stone is made in cinder, flyash and chitin mixture modified
Ash is poured into together in landfill leachate neutralization pond;The mass ratio of cinder, flyash and chitin modified is 4: 3: 1;Rubbish
It is 3: 1 that rubbish percolate, which handles material and the mass ratio of lime,;The modified chitin is prepared using following technique: by 23 parts of de- second
The chitin that acyl degree is 38% is added the sodium hydroxide solution that 125 parts of concentration are 2.8mol/L and impregnates 2 days, filters, washs, is added
Hydrogen peroxide bleaching filters, and washs, dry, be added 2 parts of epoxy bromopropanes, 0.6 part of maleic anhydride, 0.8 part of trimethylamine aqueous solution,
0.002 part of azodiisobutyronitrile and 0.04 part of tetrabutylammonium bromide stirred under pressure, mixing speed 500r/min, whipping temp are
168 DEG C, mixing time 24min, spray drying obtains modified chitin;
Step 2: will treated that landfill leachate send carries out deamination reaction to Ammonia blowing-out tower through step 1;
Step 3: anaerobic pond will be imported through step 2 treated landfill leachate;Anaerobic pond use common anaerobic nitrification, 35
DEG C, load is 1kgCOD/ (m3D), residence time 10d;
Step 4: will import SBR runoff investigation pond through step 3 treated landfill leachate, with being pumped to sbr reactor in parallel
Biological respinse is carried out in pond;The operation program in sbr reactor pond in parallel are as follows: water inlet 48min → aeration 11h → precipitating 60min → row
Water 60min, spoil disposal after drained water, each spoil disposal are 1/10, sludge age 25d of total inflow, run 3 periods daily;
Step 5: will import coagulating basin through step 4 treated landfill leachate, addition composite inorganic flocculant and be compounded with
The reaction of machine flocculant;The sludge that coagulating basin generates burns after concentrating;The composite inorganic flocculant, additive amount 3wt%, composition
For atlapulgite: haydite: waste slag of electrolytic aluminium: the composition of ferric trichloride, atlapulgite: haydite: waste slag of electrolytic aluminium: ferric trichloride
Mass ratio be 5: 3: 1: 1.3;Compound organic flocculant, additive amount 2.5wt%, formula are as follows: anion-polyacrylamide
70wt%, Powdered Activated Carbon 25wt%, chitosan 5wt%.
Embodiment 3
A kind of processing method of landfill leachate, the treating method comprises following steps:
Step 1: landfill leachate treatment material, and and stone is made in cinder, flyash and chitin mixture modified
Ash is poured into together in landfill leachate neutralization pond;The mass ratio of cinder, flyash and chitin modified is 5: 3: 1;Rubbish
It is 3: 1 that rubbish percolate, which handles material and the mass ratio of lime,;The modified chitin is prepared using following technique: by 35 parts of de- second
The chitin that acyl degree is 45% is added the sodium hydroxide solution that 140 parts of concentration are 3.5mol/L and impregnates 3 days, filters, washs, is added
Hydrogen peroxide bleaching filters, and washs, dry, be added 3 parts of epoxy bromopropanes, 0.09 part of maleic anhydride, 0.9 part of trimethylamine aqueous solution,
0.003 part of azodiisobutyronitrile and 0.05 part of tetrabutylammonium bromide stirred under pressure, mixing speed 700r/min, whipping temp are
170 DEG C, mixing time 35min, spray drying obtains modified chitin;
Step 2: will treated that landfill leachate send carries out deamination reaction to Ammonia blowing-out tower through step 1;
Step 3: anaerobic pond will be imported through step 2 treated landfill leachate;Anaerobic pond use common anaerobic nitrification, 35
DEG C, load is 1kgCOD/ (m3D), residence time 10d;
Step 4: will import SBR runoff investigation pond through step 3 treated landfill leachate, with being pumped to sbr reactor in parallel
Biological respinse is carried out in pond;The operation program in sbr reactor pond in parallel are as follows: water inlet 50min → aeration 12h → precipitating 60min → row
Water 60min, spoil disposal after drained water, each spoil disposal are 1/10, sludge age 30d of total inflow, run 3 periods daily;
Step 5: will import coagulating basin through step 4 treated landfill leachate, addition composite inorganic flocculant and be compounded with
The reaction of machine flocculant;The sludge that coagulating basin generates burns after concentrating;The composite inorganic flocculant, additive amount 5wt%, composition
For atlapulgite: haydite: waste slag of electrolytic aluminium: the composition of ferric trichloride, atlapulgite: haydite: waste slag of electrolytic aluminium: ferric trichloride
Mass ratio be 5: 3: 1: 1.3;Compound organic flocculant, additive amount 3wt%, formula are as follows: anion-polyacrylamide
60wt%, Powdered Activated Carbon 39wt%, chitosan 1wt%.
Certain refuse landfill landfill leachate 100m3, waste water composition is shown in Table 1
Table 1, waste component
COD |
mg/L |
50000 |
BOD3 |
mg/L |
3800 |
NH3-N |
mg/L |
3500 |
SS |
mg/L |
500 |
Treated that water quality detection is shown in Table 2 for method processed by the invention.
Table 2, water quality detection
Project |
Unit |
1 water quality of embodiment |
2 water quality of embodiment |
3 water quality of embodiment |
COD |
mg/L |
30 |
28 |
25 |
BOD3 |
mg/L |
5 |
4.8 |
4.5 |
NH3-N |
mg/L |
3.1 |
2.9 |
2.8 |
SS |
mg/L |
2.5 |
2.3 |
2.1 |
Copper |
mg/L |
It is not detected |
It is not detected |
It is not detected |
Nickel |
mg/L |
It is not detected |
It is not detected |
It is not detected |
Lead |
mg/L |
It is not detected |
It is not detected |
It is not detected |
Cadmium |
mg/L |
It is not detected |
It is not detected |
It is not detected |
Mercury |
mg/L |
It is not detected |
It is not detected |
It is not detected |
Description of the invention book, which does not elaborate, partly belongs to techniques well known.
The above is only a preferred embodiment of the present invention, it is noted that come for those of ordinary skill in the art
It says, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvement and modification also should be regarded as
Protection scope of the present invention.