CN101618922A - Method for processing landfill percolate - Google Patents
Method for processing landfill percolate Download PDFInfo
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- CN101618922A CN101618922A CN200910055963A CN200910055963A CN101618922A CN 101618922 A CN101618922 A CN 101618922A CN 200910055963 A CN200910055963 A CN 200910055963A CN 200910055963 A CN200910055963 A CN 200910055963A CN 101618922 A CN101618922 A CN 101618922A
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Abstract
The invention relates to a method for processing landfill percolate in the technical field of wastewater processing, which comprises the following steps: 1. filtering landfill percolate by an iron scrap layer; 2. sequentially filtering the filter liquor obtained in the step 1 by a mineralized garbage layer and a stone layer; and 3. sequentially filtering the filter liquor obtained in the step 2 by the mineralized garbage layer and the stone layer to obtain purified water. Fe and part of carbon substances in mineralized garbage are combined to form internal electrolysis, generated Fe<2+> is used as catalyst and microorganism flocculating agent needed by a following mineralized garbage biological reaction bed to reinforce the biological reaction effect of the mineralized garbage and finally the CODCr and the ammonia nitrogen of the filter liquor are reduced; and the processing cost is reduced on the basis of meeting the standard discharge of the tail water of the percolate.
Description
Technical field
The present invention relates to a kind of treatment process of technical field of waste water processing, specifically is a kind of treatment process of landfill percolate.
Background technology
China's domestic waste amount of clearing is with every year greater than 8% speed increase, and the percolate annual production of domestic refuse controllable dot source emission is about 2,900 ten thousand tons, and 1 ton of contained Pollutant levels of percolate are equivalent to the concentration of 100 tons of municipal effluents.Percolate is because characteristic such as toxicity is big, water quality is complicated, water yield fluctuation is big, organism and ammonia nitrogen concentration height, nutritive element are out of proportion, and still there is very big problem in it.China's part percolate does not carry out just directly discharging of any processing at present, and surrounding environment has been caused severe contamination.
Biological treatment is handled necessary operation as landfill percolate, in handling, percolate is widely used, general landfill yard can adopt the treatment process on the equalizing tank-anaerobic pond-oxygen pool of holding concurrently, but its water outlet COD is still about 3000～5000mg/L, the ammonia nitrogen water outlet is then about 100～1000mg/L, and after follow-up conventional aerobic treatment, its COD and ammonia nitrogen are still respectively up to 500～2000mgL
-1With 100～500mgL
-1, contain the organism of multiple difficult for biological degradation, a large amount of inorganic salt and complicated complex compound and huge legendary turtle compound in these remaining percolates.Water-quality guideline can only near or reach national percolate receive pipe standards (COD＜1000mg/L), often need to adopt the materialization treatment process that it is carried out advanced treatment, just might reach " household refuse landfill sites pollutes control criterion GB 16887-1997 " secondary standard of present universal demand, but some advanced treatment technology commonly used at present, as: reverse osmosis, activated carbon adsorption, Fenton (Fenton) oxidation, electrolysis treatment etc., because processing cost height, operation are comparatively complicated, not quite be fit to the extensive processing present situation of percolate.
The applicant is discovering for many years the landfill yard stabilization, landfill yard closed after the several years (general 8～10 years of southern area), the easily complete or approaching degraded fully of degradation material in the rubbish, this moment landfill yard surface settlement amount very little (as less than 1cm/a), rubbish itself seldom or not produces percolate and landfill gas, biodegradable content (BDM) less (as＜2.55%) in the rubbish, percolate COD concentration is lower, it is innoxious state that refuse landfill reaches stabilization of state, and the matured waste stink of this moment reduces, sieve naturally easily dries in the air.Fines material wherein (outer appearnce of Φ≤100mm) like soil ulmin, be the microaggregate shape, countless atomic holes and huge surface-area are loosened, had to quality, and be rich in organic matter, permeability is good, cation exchange capacity is high, in addition on it because of special forming process apposition growth of a great variety, quantity is huge, adaptable microflora and various organized enzyme, hardly degraded organic substances such as Mierocrystalline cellulose, xylogen, polycyclic aromatic hydrocarbons there are inherent affinity and degradation capability, therefore are very suitable for as good sewage purification matrix efficiently.
Simultaneously, interior electrolysis treatment can effectively change part hard-degraded substance structural form in the sewage, thereby improves the biodegradability of waste water.Iron filings (more use cast iron filing) and other some materials (such as C, zeolite etc.) anabolic reaction system are generally adopted in interior electrolysis.When cast iron is immersed in the waste water solution, just constituted thousands of tiny microbattery loops, pure iron is an anode, iron carbide and impurity then become negative electrode, and inner electrolytic reaction takes place, and constitute the microcosmic galvanic cell of iron inside.Simultaneously carbon inert materials such as (graphite, coke, gac, coals etc.) and iron filings etc. contact, and form macroscopical galvanic cell.In the galvanic cell reaction process, the product that electrode reaction generates has higher chemically reactive, in neutrality or tart environment, and cast iron electrode itself and the nascent state [H], the Fe that are produced
2+Deng all can with some organic composition generation redox reaction in the waste water, macromolecular substance is cracked into small molecules, be the easy group of degraded with the difficult degradation groups converted, improve the biodegradability of waste water.Therefore, generally speaking, the iron filings internal electrolysis is that collection redox, flocculation absorption, catalyzed oxidation, complexing, galvanic deposit and co-precipitation etc. act on one, can improve the good processing unit of biodegradable.But factors such as mineralized refuse bioreactor is handled in the percolate process, and is big owing to floor space, that temperature influence is serious make its popularization process be subjected to restriction to a certain degree.And in the interior electrolytic reaction process, the cost of investment of its activated carbon is excessive relatively, and the particularly interior electrolytic problem that hardens has had a strong impact on its further utilization.
Find through literature search prior art, (day for announcing: patent specification 2003.9.3) has disclosed following content: adopt landfill yard stabilization rubbish or mineralized waste to form bio-reaction bed for CN1120131C for Chinese patent Granted publication number, with pump garbage seeping water is sprayed on the mineralized waste in the reaction bed by water distributor then, water from diffusion reaches decontamination effect improving by the absorption and the degraded of mineralized waste, and part has solved percolate and handled problem not up to standard.The technical problem to be solved in the present invention is: the hard-degraded substance poor removal effect, the cost of handling after landfill percolate purifies is higher.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of treatment process of landfill percolate is provided.Part carbon species among the present invention in Fe and the mineralized waste is in conjunction with electrolysis in forming, the Fe of generation
2+As catalyzer and the microbial flocculant that follow-up mineralized refuse bioreactor needs, strengthen the biological respinse effect of mineralized waste, finally reduce the COD of percolate
CrAnd ammonia nitrogen, on the basis that solves percolate tail water qualified discharge, reduce processing cost.
The present invention realizes by following technical scheme:
The present invention relates to a kind of treatment process of landfill percolate, comprise the steps:
In the step 1, described landfill percolate: COD is 700～5000mg/L, and ammonia nitrogen concentration is 100～400mg/L, SS value＜600mg/L.
In the step 1, described iron filings layer, iron plate is wherein handled through diluted acid, and iron plate is of a size of: 0＜wide＜1cm, 1＜length＜5cm.
In the step 1, the bottom of described iron filings layer is provided with the water-permeable back up pad, is distributed with the hole that diameter is 5～10mm on the back up pad.
In step 2 and the step 3, described mineralized waste is the mineralized waste in 6～10 years of landfill.
In step 2 and the step 3, described mineralized waste is: the mineralized waste screening fines of 0＜particle diameter＜100cm.
In step 2 and the step 3, described mineralized waste is: the mineralized waste screening fines of 40＜particle diameter＜60mm.
In step 2 and the step 3 in the quality sum of mineralising waste layer and the step 1 ratio of the quality of iron filings layer be (10～20): 1.
Among the present invention, some the pollutent generation reductive actions in iron and the landfill percolate, the structure of destruction color development, auxochrome group, the biodegradability of raising landfill percolate.Along with the corrosion oxidation of iron constantly strengthens, the part ammonia nitrogen may directly be oxidized to nitrogen and removes in the percolate, and formula is seen in concrete reaction:
6Fe
3++2NH
4 +→6Fe
2++N
2+8H
+????ΔG
Θ＝-100kJ
Iron also can produce cathodic hydrogen as the hydrogen supply source by the galvanic cell effect, impels nitrate nitrogen to carry out biological autotrophic denitrification reaction.Along with the carrying out of metallic iron corrosion reaction, the autotrophic denitrification bacterium constantly grows and reduces nitrate nitrogen.
Overall equation can be used formula:
5Fe
0+2NO
3 -+6H
2O→5Fe
2++N
2+12OH
-????ΔG
Θ＝-1147kJ
In biological internal electrolysis of iron reaction system, the ferrous ion of generation and ferric ion, all energy and PO
4 3-Generate precipitation, simultaneously Fe
3+And OH
-And PO
4 3-Between strong avidity, may generate Fe
2.5PO
4(OH)
45And Fe
1.5H
2PO
4(OH)
3.8In the indissoluble complex compound, and there is very strong adsorption on the complex compound surface that generates, is further improved thereby make the total phosphorus of biological internal electrolysis of iron reaction bed remove efficient.
Compared with prior art, the present invention has following beneficial effect: the part carbon species among the present invention in Fe and the mineralized waste, and in conjunction with electrolysis in forming, the Fe of generation
2+As catalyzer and the microbial flocculant that follow-up mineralized refuse bioreactor needs, strengthen the biological respinse effect of mineralized waste, finally reduce the COD of percolate
CrAnd ammonia nitrogen, on the basis that solves percolate tail water qualified discharge, reduce its processing cost.Simultaneously, both can make things convenient for the interpolation work after the iron laminar flow loses, and in case hardening function takes place, can conveniently carry out the bed body is stopped up or tight zone is rooted out, turned over and dig or upgrade because the iron layer mainly is positioned at a body top.
Description of drawings
Fig. 1 is the treatment unit synoptic diagram of landfill percolate of the prior art;
The biological internal electrolysis of iron reaction bed of Fig. 2 water outlet COD concerns synoptic diagram over time;
The effect synoptic diagram of the biological internal electrolysis of iron reaction bed of Fig. 3 water outlet ammonia nitrogen;
The biological internal electrolysis of iron reaction bed of Fig. 4 is removed the performance synoptic diagram to percolate COD;
The biological internal electrolysis of iron reaction bed of Fig. 5 is to percolate ammonia nitrogen removal performance synoptic diagram;
The variation tendency synoptic diagram of the biological internal electrolysis of iron reaction bed of Fig. 6 water outlet COD;
The variation tendency synoptic diagram of the biological internal electrolysis of iron reaction bed of Fig. 7 water outlet ammonia nitrogen.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Fig. 1 is the treatment unit synoptic diagram of landfill percolate of the prior art, before filtering each filtering layer is filled in the staving, filters afterwards.Landfill percolate filters through the filtering layer in the staving, finishes purification.The specific nature of the landfill percolate in the present embodiment is as shown in table 1, and the specific nature that makes up the used mineralized waste of bed body is as shown in table 2.
Table 1 influent quality index (mg/L)
| Outward appearance | ??pH | ??COD Cr | ??TOC | ??TN | ??NH 3-N | Specific conductivity |
| Black | ??7.56 | ??937 | ??146.8 | ??551.5 | ??135.3 | ??10120 |
The essential property of table 2 mineralized waste (8 years ages of landfill, the screening particle diameter≤40mm)
| Character | Unit weight (g/cm3) | Porosity (%) | Permeability coefficient (cm/min) | Cation exchange capacity (the dried rubbish of milligramequivalent/g) | Organic (g/kg) | Total plate count (the dried rubbish of 106/g) |
| Numerical value | ??0.75 | ??37.25 | ??2.152 | ??65.4 | ??102.5 | ??7.2 |
Is that 1: 20 ratio makes up biological internal electrolysis of iron reaction bed with Fe and mineralized waste (the mineralized waste quality sum that refers to each layer in the staving) with mass ratio; The bottom of iron filings layer is provided with the water-permeable back up pad, is distributed with the hole that diameter is 7mm on the back up pad; Iron filings layer 510g wherein, mineralized waste 10.2Kg mixes, is packed in the staving, top spray landfill percolate (the SS value is 590mg/L), overflow enters biological internal electrolysis of iron reaction bed.System after 30d influent concentration gradient increases domestication, intermittent operation, psychrometric ratio=20: 1, solid-to-liquid ratio=50: 1, effluent quality COD, NH
3-N is shown in Fig. 2 and 3.Therefrom as can be seen, the percolate water outlet can be stablized and reached secondary discharge standard (COD＜300mg/L, ammonia nitrogen＜25mg/L).
The employing internal diameter is 10cm and highly is the PVC post of 1.0m, fills each filtering layer therein.Wherein the reaction bed body is by the high rubble supporting layer of 5cm, main body responding layer (wherein reaction bed main body responding layer is made up of by mass ratio mineralized waste and corresponding waste iron filing at 10: 1, and the Fe layer is descending at last and mineralized waste layer) and 5cm superelevation composition; The bottom of iron filings layer is provided with the water-permeable back up pad, is distributed with the hole that diameter is 10mm on the back up pad; The particle diameter of mineralized waste is 40～60mm, landfill 10 years.The jacks that lathe turning went out when used waste iron filing derived from metal machining factory processing steel alloy part, the wide about 4mm of iron filings, thick about 1mm is curling shape, and use is preceding with 1% salt acid soak 12h, and flush away surface oxidation material is rinsed well repeatedly with clear water again.
Landfill percolate (the SS value is 500mg/L) and used mineralized waste character see Table 3 and table 4 respectively.Operating parameter is that solid-to-liquid ratio is 100: 1, and the cycle of operation is 3h, and hydraulic load is 0.08m
3/ m
3Mineralized waste, reaction result is seen Figure 4 and 5.The COD clearance reaches 90%～96.8%, and water outlet is extremely yellowish inclined to one side white, can stablize to reach secondary discharge standard, when reaction bed operation 20d, its water outlet COD satisfies the GB16889-1997 first discharge standard, and its temperature higher period is described, effect is better, can reach higher emission request.
Table 3 influent quality index (mg/L)
| ??COD | ??BOD 5 | Colourity | ??pH | ??NH 3-N | ??TN | ??TP |
| ??1150-4750 | ??195-1619 | ??1200-1800 | ??7.4-8.5 | ??100-400 | ??80.5-2359 | ??1.89-29 |
Annotate: above parameter is except that pH value, colourity, and used unit is mg/L.
The essential property of table 4 mineralized waste
| Saturated hydraulic permeability coefficient (Ks) | Water ratio (%) | Organic content (%) | ??pH | Total nitrogen (g/kg) | Total phosphorus (g/kg) | Cation exchange capacity (the dried rubbish of milligramequivalent/100g) |
| ??0.994 | ??30.5 | ??10.25 | ??7.6 | ??5.19 | ??7.42-7.78 | ?66.7 |
The specific nature of landfill percolate is as shown in table 5,
Table 5 influent quality index (mg/L)
| ??COD Cr | ??pH | Specific conductivity | Ammonia nitrogen | ??TOC | ??TN | |
| Three grades of water | ??701 | ??7.47 | ??10010 | ??135 | ??398.9 | ??510.8 |
Annotate: specific conductivity unit is (μ s/cm); PH does not have unit, and all the other indexs are mg/L.
The quality of iron filings layer is 510g in this enforcement, and the quality of mineralized waste layer (the mineralized waste quality sum of each layer in the staving) is 4.65Kg; Iron plate in the used iron filings is of a size of: 0＜wide＜1cm, 1＜length＜5cm; Landfill percolate (the SS value is 400mg/L) enters into staving, and through the iron filings layer, the filtration of mineralized waste layer and stone layer is flowed out by water outlet; The bottom of iron filings layer is provided with the water-permeable back up pad, is distributed with the hole that diameter is 5mm on the back up pad; Wherein, mineralized waste is the mineralized waste in 6 years of landfill, water inlet flow velocity: 10mL/h; Reaction property: successive reaction.As can be seen from Figure 6: after biological internal electrolysis of iron reaction bed is handled, the COD of secondary water
CrCan drop to below the 300mg/L from 701mg/L, reach the two-level index of national water outlet, embody stronger processing power.As can be seen from Figure 7: mineralized waste drops to about 10mg/L from 135.3mg/L the obvious processing effect of ammonia nitrogen.This is because nitration reaction has taken place, with NH
3Change into NO
2-, NO
3-Reduced ammonia nitrogen.
From above three examples as can be seen: biological internal electrolysis of iron reaction process, for having good COD and ammonia nitrogen removal ability through biological treatment back percolate tail water, its water outlet can be satisfied " State Standard of the People's Republic of China---consumer waste filling and embedding pollutes control criterion " standard (GB16889-1997).
Claims (8)
1, a kind of treatment process of landfill percolate is characterized in that, comprises the steps:
Step 1 by the iron filings layer, is filtered landfill percolate;
Step 2 successively by mineralized waste layer and stone layer, is filtered step 1 gained filtrate;
Step 3 is passed through mineralized waste layer and stone layer successively with step 2 gained filtrate again, filters, and must purify waste water.
2, the treatment process of landfill percolate according to claim 1 is characterized in that, in the step 1, described landfill percolate: COD is 700～5000mg/L, and ammonia nitrogen concentration is 100～400mg/L, SS value＜600mg/L.
3, the treatment process of landfill percolate according to claim 1 is characterized in that, in the step 1, and described iron filings layer, iron plate is wherein handled through diluted acid, and iron plate is of a size of: 0＜wide＜1cm, 1＜length＜5cm.
4, the treatment process of landfill percolate according to claim 1 is characterized in that, in the step 1, the bottom of described iron filings layer is provided with the water-permeable back up pad, is distributed with the hole that diameter is 5～10mm on the back up pad.
5, the treatment process of landfill percolate according to claim 1 is characterized in that, in step 2 and the step 3, described mineralized waste is the mineralized waste in 6～10 years of landfill.
6, the treatment process of landfill percolate according to claim 1 is characterized in that, in step 2 and the step 3, described mineralized waste is: the mineralized waste screening fines of 0＜particle diameter＜100cm.
7, the treatment process of landfill percolate according to claim 6 is characterized in that, in step 2 and the step 3, described mineralized waste is: the mineralized waste screening fines of 40＜particle diameter＜60mm.
8, the treatment process of landfill percolate according to claim 1 is characterized in that, in step 2 and the step 3 in the quality sum of mineralising waste layer and the step 1 ratio of the quality of iron filings layer be (10～20): 1.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891356A (en) * | 2010-08-05 | 2010-11-24 | 上海交通大学 | Landfill leachate treatment method realizing zero sludge discharge |
| CN101966422A (en) * | 2010-09-26 | 2011-02-09 | 环境保护部南京环境科学研究所 | Method for processing CH4 in landfill site after acclimatizing and mineralizing garbage by utilizing percolate |
| CN102897921A (en) * | 2012-09-07 | 2013-01-30 | 常州大学 | Aged refuse participating organic waste water electro-Fenton treatment method |
| CN103342426A (en) * | 2013-08-02 | 2013-10-09 | 苏州市环境卫生管理处 | Percolate treatment method and device |
| CN103466888A (en) * | 2013-09-13 | 2013-12-25 | 广西大学 | Device for physico-chemical-biochemical combined treatment of old-aged landfill leachate |
| CN104445613A (en) * | 2014-03-29 | 2015-03-25 | 湖南碧源环保工程建设有限公司 | Mineralized refuse packed bed and wastewater denitrification method |
| CN109775929A (en) * | 2019-02-18 | 2019-05-21 | 江西盖亚环保科技有限公司 | The processing method of landfill leachate based on GY-4 type filler matrix |
-
2009
- 2009-08-06 CN CN200910055963A patent/CN101618922A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891356A (en) * | 2010-08-05 | 2010-11-24 | 上海交通大学 | Landfill leachate treatment method realizing zero sludge discharge |
| CN101891356B (en) * | 2010-08-05 | 2011-11-16 | 上海交通大学 | Landfill leachate treatment method realizing zero sludge discharge |
| CN101966422A (en) * | 2010-09-26 | 2011-02-09 | 环境保护部南京环境科学研究所 | Method for processing CH4 in landfill site after acclimatizing and mineralizing garbage by utilizing percolate |
| CN101966422B (en) * | 2010-09-26 | 2013-06-05 | 环境保护部南京环境科学研究所 | Method for processing CH4 in landfill site after acclimatizing and mineralizing garbage by utilizing percolate |
| CN102897921A (en) * | 2012-09-07 | 2013-01-30 | 常州大学 | Aged refuse participating organic waste water electro-Fenton treatment method |
| CN102897921B (en) * | 2012-09-07 | 2013-12-18 | 常州大学 | Mineralized refuse participating organic waste water electro-Fenton treatment method |
| CN103342426A (en) * | 2013-08-02 | 2013-10-09 | 苏州市环境卫生管理处 | Percolate treatment method and device |
| CN103466888A (en) * | 2013-09-13 | 2013-12-25 | 广西大学 | Device for physico-chemical-biochemical combined treatment of old-aged landfill leachate |
| CN104445613A (en) * | 2014-03-29 | 2015-03-25 | 湖南碧源环保工程建设有限公司 | Mineralized refuse packed bed and wastewater denitrification method |
| CN109775929A (en) * | 2019-02-18 | 2019-05-21 | 江西盖亚环保科技有限公司 | The processing method of landfill leachate based on GY-4 type filler matrix |
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