CN1251971C - Treating process of percolated liquid in city refuse landfill - Google Patents
Treating process of percolated liquid in city refuse landfill Download PDFInfo
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- CN1251971C CN1251971C CN 02111488 CN02111488A CN1251971C CN 1251971 C CN1251971 C CN 1251971C CN 02111488 CN02111488 CN 02111488 CN 02111488 A CN02111488 A CN 02111488A CN 1251971 C CN1251971 C CN 1251971C
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- french drain
- landfill
- recharge
- percolate
- garbage
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Abstract
The present invention belongs to the technical field of new environmental protection, particularly to a processing technology for the recirculation of the leachate of garbage landfill sites; the leachate is recirculated and penetrated in an old garbage dump body through blind drains; the yielding water is reduced further by spraying or recirculation through the blind drains or is used for speeding up the stabilization of fresh garbage; simultaneously, the biochemical performance of the leachate is improved. The processing technology has the advantages of simpleness, flexibility, environmental protection, low cost of investment and operation and high treatment efficiency.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to a kind for the treatment of process of percolated liquid in city refuse landfill.
Background technology
The disposal of current municipal wastes is still based on sanitary landfill, and the percolate that produces in refuse landfill is a kind of high density, polycomponent organic waste water, and it is its key character that water quality and quantity fluctuates widely, so the processing of percolate is a difficult problem always.The researchist has attempted the whole bag of tricks at the processing of percolate so far, problems such as biological process, chemical method, physico-chemical process, pyrolysis method and electrolytic process etc., these treatment process ubiquity long flow paths, investment are big, working cost height.
Leachate recirculation process, not only treatment process is simple, and treatment effect is good, and can quicken the stabilization process of landfill yard, thereby making traditional landfill yard regard the theory of a totally-enclosed isolated system as, convert the new concept as bioreactor system to, is the innovation of an idea.
Nearly 10 years, though the report of leachate recirculation is a lot, in the past research and practice at home and abroad, recycling mode mainly adopts surface sprinkling, owing to only pay attention to evaporate decrement and quicken the degraded of rubbish by humidity in the increase landfill yard, therefore not only the COD and the ammonia nitrogen concentration clearance of percolate are lower, and the former water of the percolate of high density is exposed to the pollution that causes rainfall runoff and air in the face of land or the air in a large number in the sprinkling process.
Summary of the invention
The objective of the invention is to propose a kind of simple, economy, environmental protection, treating process of percolated liquid in city refuse landfill efficiently.
The treating process of percolated liquid in city refuse landfill that the present invention proposes, concrete steps are as follows: after the former water process of percolate simple precipitation, utilize stale garbage (having referred generally to landfill rubbish in age more than 6 years) landfill heap body in the landfill yard that percolate is carried out french drain and recharge, tail water (referring to recharge water outlet after the processing through french drain) is carried out surface sprinkling or french drain again recharge.
In the technology of the present invention, improve the biodegradability of percolate simultaneously for quickening the new refuse stabilization, tail water can also be utilized french drain or sprinkling cross flow to recharge and infiltrate new refuse landfill heap body, water outlet utilizes french drain to recharge infiltration stale garbage heap body again.
In addition, in the technology of the present invention, percolate can also be carried out repeatedly self circulation french drain in single landfill waste heap body recharges, or fill out the french drain of connecting successively in the heap body at a plurality of (more than 2) rubbish and recharge, and the combination under the both of these case recharges, and reaches the certain index requirement until water outlet.The flow process of this technology is seen shown in Figure 1.
Among the present invention, the former water of percolate is carried out simple precipitation, used settling tank, french drain recharges engineering practice as shown in Figure 2.The pipe that it has a hole by the middle part is imbedded in rubble or the sand grains and is constituted.The diameter of pipe is generally 50-200mm, in the pipe both sides respectively perforate several, aperture 3-15mm.Filling out the tube side formula is, the hole of pipe is aimed at horizontal direction, and both sides are rubble or sand grains, and pipe can be overburden layer up and down.
In above-mentioned leachate recirculation treatment process, according to weather condition and percolate influent density, control recharging hydraulic load, the rubbish height of each landfill heap body must not be less than 1 meter, the top layer thickness of earth covering is no less than 0.3 meter, be generally 0.3-0.5 rice, cycle index or series-connected stage are several to be determined according to percolate pollutants removal rate or evaporation reduction rate.
Above-mentioned leachate recirculation treatment process advantage is as follows;
(1) can realize that percolate COD, ammonia nitrogen removal frank are respectively more than 85% and 80%;
(2) can realize cutting down significantly the percolate water yield by evaporation;
(3) this technology has extremely strong capacity of resisting impact load, moves under suitable operating mode, and it goes out the influence that water concentration and pollutants removal rate are not changed by influent concentration significantly;
(4) prevent effectively or improved the pollution of leachate recirculation atmosphere and rainfall runoff;
(5) french drain recharges in the rainy day and still can handle percolate;
(6) can quicken the stabilization of new refuse significantly.
Description of drawings
Fig. 1 is the schema of leachate recirculation treatment process of the present invention,
Fig. 2 is a french drain engineering practice synoptic diagram.Wherein, Fig. 2 (a) is a french drain pipe side diagram, and Fig. 2 (b) is the cross-section illustration of french drain pipe at the hole place, and Fig. 2 (c) is a french drain pipe landfill synoptic diagram.
Among Fig. 11,2,3 indicates three kinds of outlets of tail water respectively: 1-in this landfill heap body self circulation decrement and processing; 2-recharge new refuse heap body with tail water to quicken new refuse stabilization and processing; 3-if tail water concentration is up to standard, then discharging; Otherwise recharge next stage landfill heap further decrement of body and processing or after connect other technology and carry out processing up to standard.5 are stale garbage landfill heap body, and 6 are new refuse landfill heap body, and 7 is settling tank, and 8 is the french drain pipe, and 9 is rubble or sand grains, and 10 is earthing, and 11 is the hole on the french drain pipe.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1, recharges with somewhere, Shanghai landfill percolate and is treated to example.Main treatment facility is made up of three concrete structures: settling tank, french drain recharge junk-heap body and junk-heap body is recharged in sprinkling.Two junk-heap body areas are 17.3 square metres, and the scrap heap layer height is 1 meter, and used landfill age is without any pretreated stale garbage more than 6 years.Landfill percolate is after settling tank is removed suspended solids, flowing through successively, french drain recharges and sprinkling is recharged, in servicely be controlled at 50～200 liters according to weather condition order treatment capacity, operation result is that the moisture evaporation reduction rate is more than 30%, percolate COD concentration clearance is 85%～98%, the ammonia nitrogen concentration clearance is 82%～94%, and meets the requirement of landfill yard waste gas uncontrollable discharge standard GB14554-93 defined, i.e. NH
3＜5mg/m
3, H
2S＜0.6mg/m
3
Embodiment 2, recharge with somewhere, Shanghai landfill percolate and are treated to example.Technical process is by shown in Figure 1, and the treatment unit area is 2.25 square metres, and height is 1.5 meters, and this device is provided with french drain and sprays two kinds and recharge into water facility, and the scrap heap layer height is 1 meter, and used landfill age is without any pretreated stale garbage more than 6 years.Landfill percolate is after precipitation is removed suspended solids, carrying out french drain earlier recharges, again its water outlet is sprayed and recharge, in servicely be controlled at 7～18 liters according to the weather condition day output, operation result be the moisture evaporation reduction rate more than 30%, percolate COD concentration clearance is 85%～95%, the ammonia nitrogen concentration clearance is 82%～92%, and meet the requirement of landfill yard waste gas uncontrollable discharge standard GB14554-93 defined, i.e. NH
3＜5mg/m
3, H
2S＜0.6mg/m
3
Claims (3)
1, a kind for the treatment of process of percolated liquid in city refuse landfill, it is characterized in that concrete steps are as follows: after the former water process of percolate simple precipitation, utilize in the landfill yard landfill at the heap of the stale garbage landfill more than 6 years body percolate to be carried out french drain age and recharge, tail water is carried out surface sprinkling or french drain again recharge processing; Wherein: the garbage loading embeading waste height is greater than 1 meter, and the top layer thickness of earth covering is a 0.3-0.5 rice; French drain recharges in the step, and french drain pipe diameter is 50-200mm, and the pipe both sides have some holes, and the aperture is 3-15mm, and the both sides landfill of french drain pipe is in rubble or sand grains, and upper and lower is earthing.
2, percolate treating process according to claim 1 is characterized in that tail water is utilized french drain to recharge or sprays cross flow and recharge and infiltrate new refuse landfill heap body, and water outlet utilizes french drain to recharge to infiltrate stale garbage heap body again.
3, percolate treating process according to claim 1, it is characterized in that percolate is carried out repeatedly self french drain to be recharged in single landfill waste heap body, or pile the french drain of connecting successively in the bodies at a plurality of garbage loading embeadings and recharge, and the combination under the both of these case is recharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111488 CN1251971C (en) | 2002-04-25 | 2002-04-25 | Treating process of percolated liquid in city refuse landfill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111488 CN1251971C (en) | 2002-04-25 | 2002-04-25 | Treating process of percolated liquid in city refuse landfill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1375462A CN1375462A (en) | 2002-10-23 |
| CN1251971C true CN1251971C (en) | 2006-04-19 |
Family
ID=4741595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02111488 Expired - Fee Related CN1251971C (en) | 2002-04-25 | 2002-04-25 | Treating process of percolated liquid in city refuse landfill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1251971C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340490C (en) * | 2004-12-15 | 2007-10-03 | 深圳相控科技有限公司 | Method and system for self purification of penetrated liquid from garbage buried site by recirculation |
| CN1329318C (en) * | 2005-09-14 | 2007-08-01 | 北京天地人环保科技有限公司 | Method for disposing refuse leachate of domestic refuse landfill |
| CN101015832B (en) * | 2007-03-05 | 2010-05-19 | 清华大学 | Denitrification facultative type domestic refuse bioreactor landfill and leachate recirculation process |
| CN102390881A (en) * | 2011-09-13 | 2012-03-28 | 北京高能时代环境技术股份有限公司 | Recharging device for concentrated solution of refuse landfill |
-
2002
- 2002-04-25 CN CN 02111488 patent/CN1251971C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1375462A (en) | 2002-10-23 |
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Granted publication date: 20060419 |