CN208454725U - A kind of pretreatment system for landfill leachate treatment - Google Patents
A kind of pretreatment system for landfill leachate treatment Download PDFInfo
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- CN208454725U CN208454725U CN201820805698.8U CN201820805698U CN208454725U CN 208454725 U CN208454725 U CN 208454725U CN 201820805698 U CN201820805698 U CN 201820805698U CN 208454725 U CN208454725 U CN 208454725U
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Abstract
A kind of pretreatment system for landfill leachate treatment, including sequentially connected coagulating basin, flocculation basin, sedimentation basin, subsequent processing units and discharge bay, subsequent processing units include sequentially connected intermediate pool, Ammonia blowing-out tower and device for absorbing tail gas, the bypass line directly connecting with discharge bay is additionally provided on sedimentation basin, it also is provided with being equipped with the first NaOH chemicals dosing plant, heavy metal chelating agent chemicals dosing plant and the first online PH sensor within/on the first online ammonia chlorine detector, coagulating basin within/on sedimentation basin；PAM chemicals dosing plant is equipped in flocculation basin；The 2nd NaOH chemicals dosing plant, the second online PH sensor, heating device and line temperature sensor are equipped within/on intermediate pool；Intermediate pool is connect by return line with discharge bay, and the first sulfuric acid chemicals dosing plant, the online PH sensor of third and the second online ammonia chlorine detector are equipped within/on discharge bay.The utility model can effectively remove heavy metal and ammonia nitrogen in landfill leachate raw water.
Description
Technical field
The utility model relates to water treatment field, in particular to a kind of pretreatment system for landfill leachate treatment.
Background technique
With the expansion of China's city size, the raising of the increase of urban population and Living consumption, China city is raw
The yield of rubbish living is also steeply rising.The especially big cities such as Shanghai, Guangzhou produce rubbish daily more than 1kg, close to work per capita
Industry level of developed countries.According to the principle of China's garbage disposal " innoxious, minimizing, recycling ", large quantities of lifes will be created
Garbage sanitary filling field living.And landfill leachate whether can processed qualified discharge be to measure whether landfill yard is health
One of important indicator of landfill yard.
Landfill leachate is a kind of waste water that cost is sufficiently complex, the pollutant component of percolate include organic matter, it is inorganic from
Son and nutriment.It is mainly characterized by:
(1) COD and BOD concentration is high: COD highest is close to 100,000, and BOD generally also have it is thousands of；
(2) tenor is higher: contain more than ten metal ion species in landfill leachate, common are Fe, Cu, Pt, Ca etc.,
Wherein the concentration of iron can reach 2050mg/L, and the concentration of lead can arrive 12.3mg/L, and the concentration of calcium is even up to 4300mg/L；
(3) content of ammonia nitrogen is higher in landfill leachate: ammonia nitrogen concentration is very high in waste water (commonly reaching thousands of mg/L), especially
It is in the ammonia-nitrogen content filled out in landfill percolate always it is higher；
(4) water quality complexity, water change greatly: the ingredient of landfill leachate and the composition of rubbish have certain correlation, by
In rubbish type, the diversity of ingredient, make the landfill leachate complicated component generated, while the water of landfill leachate is by rubbish
Property, the soil property of landfill yard, meteorology and hydrologic condition influence.
The percolate treating process of existing city refuse landfill, majority select biochemistry+membrane processing method.Using it is biochemical+
When film process landfill leachate, the NH of excessive concentration3- N seriously increases the load of biochemical treatment, the weight contained in percolate
Metal component is also inhibited to bioactivity, and especially middle and advanced stage percolate processing difficulty is even more to increase；
It is main to percolate C/N imbalance at present to improve water in the way of the Add formaldehyde in biochemical treatment or the glucose
C content in body, or ammonia nitrogen is removed using traditional ammonia aeration treatment process, subsequent place has then been placed on to the removal of heavy metal
Unit is managed, the cleaning frequency and operating cost of subsequent film processing unit are increased；And there is also entirety in actual moving process
The problems such as upper operating cost is high, operational effect is unstable.
Utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies of the prior art and provide one kind for landfill leachate
The pretreatment system of processing, it can effectively remove heavy metal and ammonia nitrogen in landfill leachate raw water, can solve percolate C:N ratio
Unbalance, raw water content of beary metal is excessively high to influence the problem of back segment biochemical system operates normally, while can also solve back segment film
The easy fouling of system, the problem that cleaning frequency is high, processing cost is high.
In order to solve the above technical problems, the utility model proposes technical solution are as follows: one kind be used for landfill leachate treatment
Pretreatment system, including sequentially connected coagulating basin, flocculation basin, sedimentation basin, subsequent processing units and discharge bay are described subsequent
Processing unit includes sequentially connected intermediate pool, Ammonia blowing-out tower and device for absorbing tail gas, is additionally provided on the sedimentation basin directly
The bypass line connecting with discharge bay also is provided in the first online ammonia chlorine detector, the coagulating basin within/on the sedimentation basin
Within/on be equipped with the first NaOH chemicals dosing plant, heavy metal chelating agent chemicals dosing plant and the first online PH sensor；In the flocculation basin
Equipped with PAM chemicals dosing plant, macromolecule PAM flocculant can further make to react mixed percolate progress mud-water separation；It is described
The 2nd NaOH chemicals dosing plant, the second online PH sensor, heating device and line temperature sensor are equipped within/on intermediate pool；
The intermediate pool is connect by return line with discharge bay, and the first sulfuric acid chemicals dosing plant, third are equipped within/on the discharge bay
Online PH sensor and the second online ammonia chlorine detector.
As a further improvement of the above technical scheme: being equipped with the second sulfuric acid dosing within/on the device for absorbing tail gas and fill
It sets, device for absorbing tail gas is connect with ammonium sulfate recyclable device.
Further, the sedimentation basin is also connect with sludge treating system, and the sludge treating system is the folded spiral shell of integration
Formula sludge dewatering equipment.
Further, PH control can effectively remove most of heavy metal ion 9.0~9.5 in the coagulating basin.
Further, PH control is 10.0~11.0 in the intermediate pool, and temperature control is at 40~45 DEG C, intermediate pool
Above-mentioned parameter be back segment the pretreatment reacted of ammonia aeration, above-mentioned PH range is that ammonia aeration reacts best PH, and temperature is blown for ammonia
De- optimal reaction temperature.
Further, the heating device is steam heater, and heating effect is preferable, and heating uniformity is higher.
Further, the sedimentation basin is vertical-flow carbon steel structure sedimentation basin, and sedimentation effect is preferable, convenient for being separated by solid-liquid separation.
Further, 7.0~7.5, this pH value is the control of subsequent biochemical processing unit for PH control in the discharge bay
Best PH range, in 100~300mg/l, this ammonia-nitrogen content is that subsequent biochemical handles more suitable range for ammonia-nitrogen content control.
Further, the switching of the bypass line and return line can be opened by installation electrically operated valve come control valve
Degree is automatically controlled with realizing, can greatly reduce labor intensity and error.
The above-mentioned preprocess method for landfill leachate treatment, comprising the following steps:
1) so that landfill leachate is entered coagulating basin, NaOH and heavy metal chelating agent are added into coagulating basin, control coagulating basin
Interior PH is chemically reacted 9.0~9.5；
2) product in coagulating basin after reaction uniformly enters flocculation basin, and PAM flocculant is put into flocculation basin, is carried out into one
The chemical reaction of step；
3) product in flocculation basin after reaction uniformly enters sedimentation basin progress mud-water separation, and detects the ammonia nitrogen in supernatant
Content makes supernatant enter directly into discharge bay by bypass line as ammonia nitrogen≤300mg/l in supernatant；Work as supernatant
When ammonia nitrogen > 300mg/l in liquid, so that supernatant is entered subsequent processing units and be further processed, until in solution
When ammonia nitrogen≤300mg/l, discharge bay is entered eventually into, the sludge in sedimentation basin enters sludge treating system and handled.
As a further improvement of the above technical scheme: the treatment process of the subsequent processing units includes the following steps:
A: supernatant is flowed into intermediate pool, NaOH is put into intermediate pool, and carry out steam to intermediate pool
Heating controls PH in intermediate pool 10.0~11.0, and temperature is controlled at 40~45 DEG C, is chemically reacted；
B: the product in intermediate pool after reaction uniformly enters Ammonia blowing-out tower, and ammonia aeration reaction is carried out in Ammonia blowing-out tower,
Sewage after ammonia aeration reacts enters discharge bay, and the tail gas that ammonia aeration reaction generates enters device for absorbing tail gas, inhales to tail gas
Sulfuric acid is added in receiving apparatus, forms ammonium sulfate and carries out Resource recovery utilization；
C: entering the ammonia-nitrogen content in the sewage in discharge bay in detecting step b, as ammonia nitrogen≤300mg/l in discharge bay
When, meet water outlet ammonia nitrogen index request, opens the flowing water Valve of discharge bay；As ammonia nitrogen > 300mg/l in discharge bay, close out
The flowing water Valve in pond opens return line, so that the sewage in discharge bay is re-introduced into Ammonia blowing-out tower and carries out stripping reaction, directly
Reach requirement to water outlet ammonia nitrogen index.
Compared with the prior art, the advantages of the utility model are:
1, the pretreatment system for landfill leachate treatment of the utility model by setting coagulating basin, flocculation basin and sinks
Shallow lake pond and subsequent processing units can remove in advance heavy metal in landfill leachate and ammonia nitrogen, reduce subsequent biological treatment unit
Processing pressure, guarantee percolate treatment effect；
2, the pretreatment system for landfill leachate treatment of the utility model passes through to heavy metal in percolate and ammonia
Nitrogen effectively removes, and can be relieved the blocking scale formation of rear end membrane treatment process unit, effectively extends the service life of membrane module；
3, the online ammonia chlorine detector of the pretreatment system for landfill leachate treatment of the utility model, PH sensor and
Line temperature sensor can be easy to implement the intelligentized control method of whole process, and the degree of automation of whole process can be made higher, can
Greatly reduce labor intensity and error；
4, the pretreatment system for landfill leachate treatment of the utility model passes through setting device for absorbing tail gas and sulphur
Sour ammonium recyclable device, can not only realize waste reclamation, but also can guarantee that the environmental-protecting performance of whole system is higher；
5, the pretreatment system structure for landfill leachate treatment of the utility model is simple, construction cost is lower, and
And use is also very convenient.
Detailed description of the invention
Fig. 1 is the flow diagram of the utility model.
Marginal data:
1, coagulating basin；11, the first NaOH chemicals dosing plant；12, heavy metal chelating agent chemicals dosing plant；13, the first online PH is passed
Sensor；2, flocculation basin；21, PAM chemicals dosing plant；3, sedimentation basin；31, the first online ammonia chlorine detector；32, sludge treating system；
4, subsequent processing units；41, intermediate pool；411, the 2nd NaOH chemicals dosing plant；412, the second online PH sensor；413, it heats
Device；414, line temperature sensor；42, Ammonia blowing-out tower；43, device for absorbing tail gas；44, the second sulfuric acid chemicals dosing plant；45, sulphur
Sour ammonium recyclable device；5, discharge bay；51, the first sulfuric acid chemicals dosing plant；52, the online PH sensor of third；53, the second online ammonia chlorine
Detector；6, bypass line；7, return line.
Specific embodiment
For the ease of understanding the utility model, below in conjunction with Figure of description and preferred embodiment to the utility model
Work more comprehensively, meticulously describes, but the protection scope of the utility model is not limited to embodiment in detail below.
As shown in Figure 1, a kind of pretreatment system for landfill leachate treatment, including sequentially connected coagulating basin 1, wadding
Solidifying pond 2, sedimentation basin 3, subsequent processing units 4 and discharge bay 5, subsequent processing units 4 include sequentially connected intermediate pool 41, ammonia
Stripping tower 42 and device for absorbing tail gas 43 are additionally provided with the bypass line 6 directly connecting with discharge bay 5, sedimentation basin 3 on sedimentation basin 3
Within/on also be provided with being equipped with the first NaOH chemicals dosing plant 11, heavy metal within/on the first online ammonia chlorine detector 31, coagulating basin 1 and catch
Catch agent chemicals dosing plant 12 and the first online PH sensor 13；PAM chemicals dosing plant 21 is equipped in flocculation basin 2；Within/on intermediate pool 41
Equipped with the 2nd NaOH chemicals dosing plant 411, the second online PH sensor 412, heating device 413 and line temperature sensor 414；In
Between pond 41 connect with discharge bay 5 by return line 7, exist within/on discharge bay 5 equipped with the first sulfuric acid chemicals dosing plant 51, third
Line PH sensor 52 and the second online ammonia chlorine detector 53.
In the present embodiment, within/on device for absorbing tail gas 43 be equipped with the second sulfuric acid chemicals dosing plant 44, device for absorbing tail gas 43 with
Ammonium sulfate recyclable device 45 connects.
In the present embodiment, sedimentation basin 3 is also connect with sludge treating system 32, and sludge treating system 32 is the folded spiral shell formula of integration
Sludge dewatering equipment.
In the present embodiment, PH control is 9.0~9.5 in coagulating basin 1.
In the present embodiment, 10.0~11.0, temperature is controlled at 40~45 DEG C for PH control in intermediate pool 41.
In the present embodiment, heating device 413 is steam heater.
In the present embodiment, sedimentation basin 3 is vertical-flow carbon steel structure sedimentation basin.
In the present embodiment, 7.0~7.5, ammonia-nitrogen content is controlled in 100~300mg/l for PH control in discharge bay 5.
The above-mentioned preprocess method for landfill leachate treatment, comprising the following steps:
1) so that landfill leachate is entered coagulating basin 1, NaOH and heavy metal chelating agent are added into coagulating basin 1, control coagulation
PH is chemically reacted 9.0~9.5 in pond 1；
2) product in coagulating basin 1 after reaction uniformly enters flocculation basin 2, and PAM flocculant is put into flocculation basin 2, carries out
Further chemical reaction；
3) product in flocculation basin 2 after reaction uniformly enters the progress mud-water separation of sedimentation basin 3, and detects the ammonia in supernatant
Nitrogen content makes supernatant enter directly into discharge bay 5 by bypass line 6 as ammonia nitrogen≤300mg/l in supernatant；When
When ammonia nitrogen > 300mg/l in supernatant, so that supernatant is entered subsequent processing units 4 and be further processed, until molten
When ammonia nitrogen≤300mg/l in liquid, discharge bay 5 is entered eventually into, the sludge in sedimentation basin 3 enters the progress of sludge treating system 32
Processing.
In the present embodiment, the treatment process of subsequent processing units 4 includes the following steps:
A: supernatant is flowed into intermediate pool 41, puts into NaOH into intermediate pool 41, and to intermediate pool 41 into
The heating of row steam controls PH in intermediate pool 41 10.0~11.0, and temperature is controlled at 40~45 DEG C, is chemically reacted；
B: the product in intermediate pool 41 after reaction uniformly enters Ammonia blowing-out tower 42, and ammonia aeration is carried out in Ammonia blowing-out tower 42
Reaction, the sewage after ammonia aeration reacts enter discharge bay 5, and the tail gas that ammonia aeration reaction generates enters device for absorbing tail gas 43,
Sulfuric acid is added into device for absorbing tail gas 43, forms ammonium sulfate and carries out Resource recovery utilization；
C: entering the ammonia-nitrogen content in the sewage in discharge bay 5 in detecting step b, when ammonia nitrogen in discharge bay 5≤
When 300mg/l, meets water outlet ammonia nitrogen index request, open the flowing water Valve of discharge bay 5；As ammonia nitrogen > 300mg/l in discharge bay 5
When, the flowing water Valve of discharge bay 5 is closed, return line 7 is opened, the sewage in discharge bay 5 is made to be re-introduced into Ammonia blowing-out tower 42
Stripping reaction is carried out, until water outlet ammonia nitrogen index reaches requirement.
Claims (8)
1. a kind of pretreatment system for landfill leachate treatment, it is characterised in that: including sequentially connected coagulating basin (1),
Flocculation basin (2), sedimentation basin (3), subsequent processing units (4) and discharge bay (5), the subsequent processing units (4) include successively connecting
Intermediate pool (41), Ammonia blowing-out tower (42) and the device for absorbing tail gas (43) connect is additionally provided on the sedimentation basin (3) directly and goes out
The bypass line (6) of pond (5) connection, also is provided in the first online ammonia chlorine detector (31), institute within/on the sedimentation basin (3)
It states and is equipped with the first NaOH chemicals dosing plant (11), heavy metal chelating agent chemicals dosing plant (12) and the first online PH within/on coagulating basin (1)
Sensor (13)；PAM chemicals dosing plant (21) are equipped in the flocculation basin (2)；Second is equipped within/on the intermediate pool (41)
NaOH chemicals dosing plant (411), the second online PH sensor (412), heating device (413) and line temperature sensor (414)；Institute
It states intermediate pool (41) to connect by return line (7) with discharge bay (5), the first sulfuric acid is equipped within/on the discharge bay (5) and is added
Medicine device (51), the online PH sensor of third (52) and the second online ammonia chlorine detector (53).
2. the pretreatment system according to claim 1 for landfill leachate treatment, it is characterised in that: the tail gas is inhaled
The second sulfuric acid chemicals dosing plant (44), device for absorbing tail gas (43) and ammonium sulfate recyclable device (45) are equipped within/on receiving apparatus (43)
Connection.
3. the pretreatment system according to claim 1 for landfill leachate treatment, it is characterised in that: the sedimentation basin
(3) it is also connect with sludge treating system (32), the sludge treating system (32) is integrated Stacked sludge dewatering machine.
4. the pretreatment system according to claim 1 for landfill leachate treatment, it is characterised in that: the coagulating basin
(1) interior PH control is 9.0~9.5.
5. the pretreatment system according to claim 1 for landfill leachate treatment, it is characterised in that: the intermediate water
10.0~11.0, temperature is controlled at 40~45 DEG C pond (41) interior PH.
6. the pretreatment system according to any one of claims 1-5 for landfill leachate treatment, it is characterised in that:
The heating device (413) is steam heater.
7. the pretreatment system according to any one of claims 1-5 for landfill leachate treatment, it is characterised in that:
The sedimentation basin (3) is vertical-flow carbon steel structure sedimentation basin.
8. the pretreatment system according to any one of claims 1-5 for landfill leachate treatment, it is characterised in that:
7.0~7.5, ammonia-nitrogen content is controlled in 100~300mg/l for the interior PH control of discharge bay (5).
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| CN108395048A (en) * | 2018-05-28 | 2018-08-14 | 湖南北控威保特环境科技股份有限公司 | A kind of pretreatment system and its processing method for landfill leachate treatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108395048A (en) * | 2018-05-28 | 2018-08-14 | 湖南北控威保特环境科技股份有限公司 | A kind of pretreatment system and its processing method for landfill leachate treatment |
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