CN109928476A - A kind of landfill leachate pretreatment system and its technique - Google Patents
A kind of landfill leachate pretreatment system and its technique Download PDFInfo
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- CN109928476A CN109928476A CN201910345367.XA CN201910345367A CN109928476A CN 109928476 A CN109928476 A CN 109928476A CN 201910345367 A CN201910345367 A CN 201910345367A CN 109928476 A CN109928476 A CN 109928476A
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Abstract
The present invention discloses and provides a kind of pollutional load is low, equipment scaling probability is small, service life of equipment is long and total processing cost is low landfill leachate pretreatment system and its treatment process.Treated through the invention landfill leachate supernatant, suspended matter (SS) is significantly reduced, removal rate reaches 60-70%, and COD removal rate reaches 20-30%, and the calcium ions and magnesium ions of heat exchange pipe of evaporator binding dirt is easy to cause also to obtain biggish removal.Treated through the invention simultaneously, and landfill leachate supernatant greatly reduces the difficulty of the mainstreams treatment process such as subsequent MVR function of mechanical steam recompression, MBR+NF/RO, DTRO, improves standard water discharge fraction.The present invention is suitable for sewage treatment field.
Description
Technical field
The present invention relates to a kind of landfill leachate pretreatment system and its techniques.
Background technique
The general main body treatment process of landfill leachate has MVR function of mechanical steam recompression, MBR+NF/RO, DTRO etc..This is several
Kind technique requires to include pretreating process section.Pretreating process phase method is different, and mode is different, is also not achieved due
Effect.Conventional pretreating process has coagulating sedimentation, physical filtering, ozone oxidation, advanced oxidation etc..Its main problem is usually
The problems such as dosage is big, at high cost, large labor intensity etc., and effect is undesirable, and heat-exchanging tube bundle fouling, film is easy to cause to block up.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide, a kind of pollutional load is low, equipment
The landfill leachate pretreatment system and its treatment process that fouling probability is small, service life of equipment is long and total processing cost is low.
The technical scheme adopted by the invention is that: the landfill leachate pretreatment system in the present invention includes being sequentially connected to connect
Stoste pool, coagulation reaction tank group, device for separating mud and water and intermediate pool, the landfill leachate pretreatment system further includes
Filter press, sodium hydroxide delivery device, aluminium polychloride delivery device and polyacrylamide delivery device, the filter press point
It is not connected with the device for separating mud and water and the intermediate pool, the sodium hydroxide delivery device, the polyaluminium
Aluminium delivery device and the polyacrylamide delivery device are connected with the coagulation reaction tank group respectively.
The coagulation reaction tank group includes being sequentially connected the first coagulation reaction tank, the second coagulation reaction tank and third connect
Coagulation reaction tank, the stoste pool are connected by stoste delivery pump with first coagulation reaction tank, and the third coagulation is anti-
The discharge end of Ying Chi is connected with the device for separating mud and water.
The sodium hydroxide delivery device includes sodium hydroxide medicament holding vessel and the first dosing pump, the sodium hydroxide
Holding vessel is connected by first dosing pump with first coagulation reaction tank.
The aluminium polychloride delivery device includes aluminium polychloride medicament storage tank and the second dosing pump, the polymerization
Aluminium chloride medicament storage tank is connected by second dosing pump with second coagulation reaction tank.
The polyacrylamide delivery device includes polyacrylamide medicament holding vessel and third dosing pump, and described poly- third
Acrylamide medicament storage tank is connected by the third dosing pump with the third coagulation reaction tank.
The sodium hydroxide medicament holding vessel, the aluminium polychloride medicament storage tank and the polyacrylamide medicament
Holding vessel is connected with external water supply, the sodium hydroxide medicament holding vessel, the aluminium polychloride medicament storage tank
And the polyacrylamide medicament holding vessel is built-in with blender.
The device for separating mud and water includes sedimentation basin, immersible pump and sludge concentration tank, and the immersible pump is arranged described
The output end connection of the bottom of sedimentation basin, the immersible pump is arranged in the sludge concentration tank, and the third coagulation is anti-
The discharge end of Ying Chi is connected with the sedimentation basin, and the sedimentation basin is connected with the intermediate pool.
The filter press is connected by sludge screw pump with the bottom of the sludge concentration tank, and the filter press goes out liquid
End is connected with the intermediate pool.
The landfill leachate pretreating process completed in the present invention by above-mentioned landfill leachate pretreatment system, packet
Include following steps:
A. the percolate in the stoste pool is delivered in first coagulation reaction tank by the stoste delivery pump, and described first
Dosing pump by the sodium hydroxide medicament in the sodium hydroxide medicament holding vessel be thrown in first coagulation reaction tank and with
Percolate hybrid reaction in first coagulation reaction tank；
B. the resulting mixed liquor of step A is delivered in second coagulation reaction tank, second dosing pump is by the polymerization
In aluminium polychloride medicament delivery to second coagulation reaction tank in aluminium chloride medicament storage tank and with second coagulation
Mixed liquor hybrid reaction in reaction tank；
C. the resulting mixed liquor of step B is delivered in the third coagulation reaction tank, the third dosing pump is by described poly- third
Polyacrylamide medicament in acrylamide medicament storage tank be thrown in the third coagulation reaction tank and with the third coagulation
Mixed liquor hybrid reaction in reaction tank；
D. the mixed liquor after step C reaction is flow in the sedimentation basin by self weight carries out mud-water separation；
E. after step D, the supernatant for being placed in the sedimentation basin top is temporary into the intermediate pool, and what is precipitated is placed in
The sludge of the precipitating bottom of pond portion is extracted to progress secondary concentration precipitating in the sludge concentration tank through the immersible pump；
F. sludge obtained by step E is extracted into the filter press and is dehydrated by the sludge screw pump, outside dewatered sludge
Fortune processing, gained extraction raffinate are back in the sludge concentration tank.
The beneficial effects of the present invention are: treated through the invention landfill leachate supernatant, suspended matter (SS) obtain
It significantly reduces, removal rate reaches 60-70%, and COD removal rate reaches 20-30%, is easy to cause heat exchange pipe of evaporator binding
The calcium ions and magnesium ions of dirt have also obtained biggish removal.Treated through the invention simultaneously, and landfill leachate supernatant substantially reduces
The difficulty of the mainstreams treatment process such as subsequent MVR function of mechanical steam recompression, MBR+NF/RO, DTRO improves standard water discharge and guarantees
Rate.
Detailed description of the invention
Fig. 1 is structure connection diagram of the invention.
Specific embodiment
As shown in Figure 1, the landfill leachate pretreatment system in the present invention includes being sequentially connected the stoste pool 1 connect, coagulation
Reaction tank group, device for separating mud and water and intermediate pool 2, the landfill leachate pretreatment system further include filter press 3, hydrogen-oxygen
Change sodium delivery device, aluminium polychloride delivery device and polyacrylamide delivery device, the filter press 3 respectively with the mud
Water separation device and the intermediate pool 2 are connected, the sodium hydroxide delivery device, the aluminium polychloride delivery device
And the polyacrylamide delivery device is connected with the coagulation reaction tank group respectively.
The coagulation reaction tank group include be sequentially connected the first coagulation reaction tank 41 connect, the second coagulation reaction tank 42 and
Third coagulation reaction tank 43, the stoste pool 1 is connected by stoste delivery pump 11 with first coagulation reaction tank 41, described
The discharge end of third coagulation reaction tank 43 is connected with the device for separating mud and water.
The sodium hydroxide delivery device includes sodium hydroxide medicament holding vessel 51 and the first dosing pump 52, the hydrogen-oxygen
Change sodium holding vessel 51 to be connected by first dosing pump 52 with first coagulation reaction tank 41.
The aluminium polychloride delivery device includes aluminium polychloride medicament storage tank 61 and the second dosing pump 62, described
Aluminium polychloride medicament storage tank 61 is connected by second dosing pump 62 with second coagulation reaction tank 42.
The polyacrylamide delivery device includes polyacrylamide medicament holding vessel 71 and third dosing pump 72, described
Polyacrylamide medicament holding vessel 71 is connected by the third dosing pump 72 with the third coagulation reaction tank 43.
The sodium hydroxide medicament holding vessel 51, the aluminium polychloride medicament storage tank 61 and the polyacrylamide
Medicament storage tank 71 is connected with external water supply 9, the sodium hydroxide medicament holding vessel 51, the aluminium polychloride medicine
Agent holding vessel 61 and the polyacrylamide medicament holding vessel 71 are built-in with blender, and the blender in each holding vessel will
Medicament is stirred evenly with tap water.
The device for separating mud and water includes sedimentation basin 81, immersible pump 82 and sludge concentration tank 83, and the immersible pump 82 is set
It sets in the bottom of the sedimentation basin 81, the output end connection of the immersible pump 82 is arranged in the sludge concentration tank 83, described
The discharge end of the third coagulation reaction tank 43 is connected with the sedimentation basin 81, the sedimentation basin 81 and the intermediate pool 2
It is connected.
The filter press 3 is connected by sludge screw pump 31 with the bottom of the sludge concentration tank 83, the filter press 3
Outlet end be connected with the intermediate pool 2
A kind of landfill leachate pretreating process completed by above-mentioned landfill leachate pretreatment system comprising following step
It is rapid:
A. the percolate in the stoste pool 1 is delivered in first coagulation reaction tank 41 by the stoste delivery pump 11, institute
Stating the first dosing pump 52, that the sodium hydroxide medicament in the sodium hydroxide medicament holding vessel 51 is thrown to first coagulation is anti-
Answer in pond 41 and with the percolate hybrid reaction in first coagulation reaction tank 41, the effect of sodium hydroxide is to adjust percolate
PH value, allow the pH value of percolate to be maintained at the optimum reaction condition of 7-8 or so, the configuration concentration of sodium hydroxide medicament generally exists
5-10% or so；
B. the resulting mixed liquor of step A is delivered in second coagulation reaction tank 42, second dosing pump 62 will be described
In aluminium polychloride medicament delivery to second coagulation reaction tank 42 in aluminium polychloride medicament storage tank 61 and with it is described
Mixed liquor hybrid reaction in second coagulation reaction tank 42, aluminium polychloride are the splendid inorganic coagulants of performance, it can be with
Suspended particulate in landfill leachate chemically reacts, and makes the charging neutrality of suspended particulate, makes the suspension in landfill leachate
Particle aggregation is at the wadding body of bulky grain, and the configuration concentration of aluminium polychloride medicament is generally in 3-5% or so；
C. the resulting mixed liquor of step B is delivered in the third coagulation reaction tank 43, the third dosing pump 72 will be described
Polyacrylamide medicament in polyacrylamide medicament holding vessel 71 be thrown in the third coagulation reaction tank 43 and with it is described
Mixed liquor hybrid reaction in third coagulation reaction tank 43, polyacrylamide are good organic flocculants, it and polyaluminium
Aluminium (PAC) is used in series, and can play maximum effect, the wadding body of coacervating large particle.Polyacrylamide can will pass through poly-
Little particle wadding body after closing chlorination aluminum flocculation, further becomes the particulate matter of larger diameter, is more advantageous to its precipitating, sodium hydroxide
The configuration concentration of medicament is generally in 0.05-0.1% or so；
D. the mixed liquor after step C reaction is flow in the sedimentation basin 81 by self weight carries out mud-water separation, at this time toward described heavy
Deodorant is launched in shallow lake pond 81 and carries out deodorization, eliminates stink；
E. after step D, the supernatant for being placed in 81 top of sedimentation basin is temporary into the intermediate pool 2, precipitates
The sludge for being placed in 81 bottom of sedimentation basin be extracted in the sludge concentration tank 83 through the immersible pump 82 carry out it is secondary dense
Shrink mark forms sediment；
F. sludge obtained by step E is extracted into the filter press 3 and is dehydrated by the sludge screw pump 31, makes moisture percentage in sewage sludge
It can be reduced to 55% or so, the outer designated place that is transported to carries out harmless treatment after dewatered sludge is packed, and gained extraction raffinate is returned
It flow in the sludge concentration tank 83.
The present invention is suitable for sewage treatment field.
Claims (9)
1. a kind of landfill leachate pretreatment system, it is characterised in that: the landfill leachate pretreatment system includes successively phase
Stoste pool (1), coagulation reaction tank group, device for separating mud and water and the intermediate pool (2) of connection, the landfill leachate pretreatment
System further includes that filter press (3), sodium hydroxide delivery device, aluminium polychloride delivery device and polyacrylamide launch dress
It sets, the filter press (3) is connected with the device for separating mud and water and the intermediate pool (2) respectively, the sodium hydroxide
Delivery device, the aluminium polychloride delivery device and the polyacrylamide delivery device respectively with the coagulation reaction tank
Group is connected.
2. a kind of landfill leachate pretreatment system according to claim 1, it is characterised in that: the coagulation reaction tank group
Including being sequentially connected the first coagulation reaction tank (41) connect, the second coagulation reaction tank (42) and third coagulation reaction tank (43),
The stoste pool (1) is connected by stoste delivery pump (11) with first coagulation reaction tank (41), and the third coagulation is anti-
The discharge end of Ying Chi (43) is connected with the device for separating mud and water.
3. a kind of landfill leachate pretreatment system according to claim 2, it is characterised in that: the sodium hydroxide is launched
Device includes sodium hydroxide medicament holding vessel (51) and the first dosing pump (52), and the sodium hydroxide holding vessel (51) passes through institute
The first dosing pump (52) is stated to be connected with first coagulation reaction tank (41).
4. a kind of landfill leachate pretreatment system according to claim 3, it is characterised in that: the aluminium polychloride is thrown
Putting device includes aluminium polychloride medicament storage tank (61) and the second dosing pump (62), the aluminium polychloride medicament storage tank
(61) it is connected by second dosing pump (62) with second coagulation reaction tank (42).
5. a kind of landfill leachate pretreatment system according to claim 4, it is characterised in that: the polyacrylamide is thrown
Putting device includes polyacrylamide medicament holding vessel (71) and third dosing pump (72), the polyacrylamide medicament holding vessel
(71) it is connected by the third dosing pump (72) with the third coagulation reaction tank (43).
6. a kind of landfill leachate pretreatment system according to claim 5, it is characterised in that: the sodium hydroxide medicament
Holding vessel (51), the aluminium polychloride medicament storage tank (61) and the polyacrylamide medicament holding vessel (71) are and outside
Portion's water supply is connected, the sodium hydroxide medicament holding vessel (51), the aluminium polychloride medicament storage tank (61) and
The polyacrylamide medicament holding vessel (71) is built-in with blender.
7. a kind of landfill leachate pretreatment system according to claim 6, it is characterised in that: the device for separating mud and water
Including sedimentation basin (81), immersible pump (82) and sludge concentration tank (83), the immersible pump (82) is arranged in the sedimentation basin
(81) bottom, the output end connection setting of the immersible pump (82) is in the sludge concentration tank (83), the third
The discharge end of coagulation reaction tank (43) is connected with the sedimentation basin (81), the sedimentation basin (81) and the intermediate pool (2)
It is connected.
8. a kind of landfill leachate pretreatment system according to claim 7, it is characterised in that: the filter press (3) is logical
Sludge screw pump (31) is crossed to be connected with the bottom of the sludge concentration tank (83), the outlet end of the filter press (3) with it is described
Intermediate pool (2) is connected.
9. a kind of landfill leachate realized by a kind of landfill leachate pretreatment system according to any one of claims 8 pre-processes
Technique, which is characterized in that the landfill leachate pretreating process the following steps are included:
A. the inner percolate of the stoste pool (1) is delivered to first coagulation reaction tank (41) by the stoste delivery pump (11)
Interior, the sodium hydroxide medicament in the sodium hydroxide medicament holding vessel (51) is thrown to described by first dosing pump (52)
In one coagulation reaction tank (41) and with the percolate hybrid reaction in first coagulation reaction tank (41)；
B. the resulting mixed liquor of step A is delivered in second coagulation reaction tank (42), second dosing pump (62) will
In aluminium polychloride medicament delivery to second coagulation reaction tank (42) in the aluminium polychloride medicament storage tank (61)
And with the mixed liquor hybrid reaction in second coagulation reaction tank (42)；
C. the resulting mixed liquor of step B is delivered in the third coagulation reaction tank (43), the third dosing pump (72) will
Polyacrylamide medicament in the polyacrylamide medicament holding vessel (71) is thrown in the third coagulation reaction tank (43)
And with the mixed liquor hybrid reaction in the third coagulation reaction tank (43)；
D. the mixed liquor after step C reaction is flow in the sedimentation basin (81) by self weight carries out mud-water separation；
E. after step D, the supernatant for being placed in the sedimentation basin (81) top is temporary into the intermediate pool (2), under precipitating
The sludge for being placed in the sedimentation basin (81) bottom come is extracted in the sludge concentration tank (83) through the immersible pump (82)
Carry out secondary concentration precipitating；
F. sludge obtained by step E is extracted into the filter press (3) and is dehydrated by the sludge screw pump (31), dewatered
Sludge outward transport processing, gained extraction raffinate are back in the sludge concentration tank (83).
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| CN110510792A (en) * | 2019-08-10 | 2019-11-29 | 北京首钢生物质能源科技有限公司 | Pretreatment unit and preprocess method for percolation liquid membrane concentrate MVR evaporation |
| CN111777223A (en) * | 2020-07-09 | 2020-10-16 | 南京万德斯环保科技股份有限公司 | Landfill leachate stock solution pretreatment method and system for disc-tube reverse osmosis treatment |
| CN114634271A (en) * | 2022-02-09 | 2022-06-17 | 中创水务科技环保(广东)有限公司 | Waste water zero-discharge treatment process for garbage transfer station |
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Inventor after: Cai Mingjin Inventor before: Cai Mingjin |