CN104230051A - Landfill leachate reverse osmosis concentrated solution treatment process and special equipment thereof - Google Patents
Landfill leachate reverse osmosis concentrated solution treatment process and special equipment thereof Download PDFInfo
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- CN104230051A CN104230051A CN201410449214.7A CN201410449214A CN104230051A CN 104230051 A CN104230051 A CN 104230051A CN 201410449214 A CN201410449214 A CN 201410449214A CN 104230051 A CN104230051 A CN 104230051A
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Abstract
The invention discloses a landfill leachate reverse osmosis concentrated solution treatment process and special equipment thereof. The process comprises the following steps: feeding effluent subjected to nanofiltration treatment into a reverse osmosis system for performing concentration and separation, thereby obtaining a reverse osmosis concentrated solution; feeding the obtained reverse osmosis concentrated solution into a pretreatment unit, and performing water quality regulation; and finally, feeding the pretreated effluent into a reverse osmosis concentrated solution treatment system for further concentration, so that the recovery rate of the reverse osmosis produced water is improved, and the amount of the concentrated solution is reduced. According to the invention, the reverse osmosis concentrated solution is treated by adopting a reverse osmosis concentrated solution re-concentration technology, so that the concentrated solution is reduced to be consumed in an incineration plant, and the water recovery rate is improved. In addition, the amount of the concentrated solution is greatly reduced, the amount of the concentrated solution can be reduced to 10 percent, and the economic benefits and environmental benefits are obvious.
Description
Technical field
The invention belongs to environmental technology field, specifically just relate to technique and the specific equipment thereof of the process of a kind of percolate reverse osmosis concentrated liquid, the high power that this technique achieves reverse osmosis system water outlet reclaims, and decreases the discharge of concentrated liquid measure, protects environment
Background technology
Along with China city numbers increases and the increasing of population, municipal wastes is also with sharp increase, and the situation of garbage-surrounded city is very severe.At present, refuse treatment is mainly based on landfill and burning, wherein landfill remains main mode, and accounting, between 45%-50%, burns accounting about 12%, another still have the domestic refuse of 30% to fail to process, compared with landfill, burning method can effectively reduce waste volumes more than 75%, saves soil, not easily produce the pollution such as sewage permeation, and produce calorific value and can be used for heat supply, generating etc. and recycle.Therefore, the processing mode of waste incineration will be widelyd popularize.
But no matter refuse treatment is take landfill, or the mode of burning, the process of percolate is all technical barrier wherein.Percolate belongs to high concentration hard-degraded organic waste water, there is complicated component, Pollutant levels are high, biological nutrition proportional imbalance, colourity are high, the feature that stink is large, biodegradability is poor, therefore, the process of percolate is faced with the insoluble technical barrier of some always.At present, percolate advanced treatment process adopts the combination process of nanofiltration (NF)+reverse osmosis (RO) usually.Under normal circumstances, the rate of recovery of reverse-osmosis treated unit is 75-80%, and the overall rate of recovery of whole system is general not higher than 68%, and the concentrated liquid measure of generation is comparatively large, and wherein, the concentrated solution process in reverse osmosis units is a professional difficult problem.
Main containing a large amount of salinities and a small amount of organism etc. in reverse osmosis concentrated liquid, at present, traditional reverse osmosis concentrated liquid treatment technology mainly contain in direct field dissolve, advanced oxidation, directly evaporation etc.
Dissolve in direct field and be mainly divided into back spray to burn and comprehensive recycling two kinds of modes.First kind of way: return spray and burn, return after pre-treatment by the concentrated solution of reverse osmosis and be sprayed onto incinerator opening for feed and burn, can dissolve and process a part of concentrated solution, but it is few that time spray is suitable for concentrated solution output, the occasion that refuse thermal value is high, the situation lower for the larger calorific value of concentrated solution generation is not suitable for, otherwise incinerator fire box temperature can be caused too low, even flame-out situation, and the incinerator of long-time running can be corroded, equipment failure rate is also comparatively frequent, cannot maintain steady running.The second way: comprehensive recycling, because in incineration plant, some technique unit is less demanding to quality of water, therefore, reverse osmosis concentrated liquid after pre-treatment can by waste incineration disposal system each with water ring joint carry out comprehensive recycling, as the slag cooling water of incinerator, leak grey transfer roller, the use water of dragveyer, mixing water in lime white making processes, gas cleaning and cooling water, reaction tower water etc., the concentrated solution of a part of can dissolving while not affecting garbage burning factory normal operation, but the concentrated liquid measure of traditional reverse osmosis concentration technology is generally between 25 ~ 40%, the amount of concentrated solution is very large, the amount of dissolving in is limited, remaining a large amount of concentrated solution remains a problem.
Advanced oxidation processes mainly comprises: 1. ozonation technology; 2. Fenton reagent oxidation style; 3. photocatalytic oxidation; 4. electron radiation facture; 5. gac-H
2o
2catalytic oxidation.Alkyl in percolate, ketone, the oxidation of aldehyde functional group can make aromatic nucleus split by this technology, double bond addition and mineralising etc., and oxidative decomposition occur further until be degraded to final product CO
2and H
2o, thus make COD reach emission standard, cleanliness without any pollution, but this technology oxygenant dosage is large, and working cost is all high compared with other treatment processs, and water outlet total nitrogen cannot be up to standard.
Evaporation is the technique of directly evaporation and drying and processing reverse osmosis concentrated liquid, it is simple to operate, operational management difficulty is low compared with other techniques, thoroughly can realize the advantage of zero release, but facility investment and running cost are all very high, and when running the acid corrosion that produces and brine corrosion situation quite serious, mainstay material in the market is all difficult to the anticorrosion class requirement meeting reverse osmosis concentrated liquid evaporation unit, long-term acid, brine corrosion can make equipment produce high maintenance cost, and equipment failure rate occurred frequently also cannot ensure the steady running of facility.In this technique same, concentrated solution can not be removed completely, also can be left a small amount of evaporation raffinate, and the handling problems of raffinate still exists.
Summary of the invention
The object of the invention is for existing percolate reverse osmosis produced water recovery utilization rate not high, concentrated solution residual quantity is larger, and water outlet total nitrogen does not reach standard, the technological deficiency of easy contaminate environment, a kind of percolate reverse osmosis concentration liquor treating process and specific equipment thereof are provided, the reverse osmosis concentrated liquid of percolate is carried out reconcentration, improves the recovery utilization rate of water, avoid the harm that environment is caused.
Technical scheme
In order to realize above-mentioned technical purpose, the present invention designs a kind of percolate reverse osmosis concentration liquor treating process, and it is characterized in that, it comprises following step:
(1) the water outlet feeding reverse osmosis system through nanofiltration process is carried out concentrating and separating and obtain reverse osmosis concentrated liquid, this system adopts the mode of membrane sepn to carry out concentrating and separating, operating pressure conditions is (15-40) bar, water molecule energy is through film, and the material such as the monovalent salt of lower concentration and small organic molecule is trapped in concentrated solution, this unit can by Waste water concentrating 2 ~ 10 times, and Water Sproading rate is 70-80%;
(2) reverse osmosis concentrated liquid step (1) obtained sends into pretreatment unit, adds chemical reagent, water quality regulation pH to 10-12, carries out precipitin reaction, removes calcium, magnesium, SO
4 2-, silicon etc., to alleviate the risk of reverse osmosis concentrated liquid scaling, be beneficial to concentrating and separating.
(3) reverse osmosis concentration liquid treating system is sent in the water outlet produced after pre-treatment in step (2) to concentrate further, operating pressure conditions is (20-60) bar, water molecule energy is through film, the reverse osmosis produced water rate of recovery can be improved and reduce concentrated liquid measure, can by concentrated solution reconcentration 2 ~ 5 times, Water Sproading rate is between 60-80%; The filtered solution that reverse osmosis concentration liquid treating system produces, sends reverse osmosis produced water back to, improves the overall Water Sproading rate of reverse osmosis system.
For the specific equipment of above-mentioned percolate reverse osmosis concentration liquor treating process, it is characterized in that, it comprises raw water box, described raw water box output terminal is connected with the first accurate filter, the connecting pipeline of raw water box and the first accurate filter is equipped with intake pump, first accurate filter output terminal is connected to reverse osmosis membrane assembly, and the first accurate filter and reverse osmosis membrane assembly connecting pipeline are equipped with high-pressure pump; The permeate outlet of reverse osmosis membrane assembly is connected to product water tank, and concentrated solution is connected to pretreatment unit; Pretreatment unit output terminal is connected to the second accurate filter, and the second accurate filter output terminal is connected to reverse osmosis concentrated liquid film assembly, and the second accurate filter and reverse osmosis concentrated liquid membrane module connecting pipeline are equipped with high-pressure pump; The permeate output terminal of reverse osmosis concentrated liquid film assembly is connected to product water tank, and concentrated solution goes back to place and to dissolve process.
Further, all recycle pump is housed, for the flow control of film main frame in described reverse osmosis membrane assembly and reverse osmosis concentrated liquid film assembly.
Further, the two ends of described reverse osmosis membrane assembly 4 and reverse osmosis concentrated liquid film assembly 9 are equipped with Membrane cleaning equipment water-in and water outlet.
Beneficial effect
The present invention adopts reverse osmosis dope reconcentration technology to process reverse osmosis concentrated liquid, the degree of dissolving in concentrated solution decrement to incineration plant factory can be made, and improve Water Sproading rate, running cost is relatively low, reverse osmosis entirety can be produced Water Sproading rate simultaneously and accomplish 90%, the more existing reverse osmosis produced water rate of recovery significantly improves, and the high power achieving water reclaims; Greatly reduce concentrated liquid measure in addition, can by concentrated solution decrement to 10%, this residue concentrated solution can be used as flyash curing humidification, fume treatment or lime and sizes mixing, and can meet place and to dissolve the ability to bear of process, reduce processing costs, economic benefit and obvious environment benefit.
Accompanying drawing explanation
Accompanying drawing 1 is process flow sheet of the present invention.
Accompanying drawing 2 is specific equipment connection diagram of the present invention.
Embodiment
The present invention will be further described for drawings and Examples below.
Embodiment
As shown in Figure 2, a kind of specific equipment of percolate reverse osmosis concentration liquor treating process, it comprises raw water box 1, described raw water box 1 output terminal is connected with the first accurate filter 2, the connecting pipeline of raw water box 1 and the first accurate filter 2 is equipped with intake pump 3, first accurate filter 2 output terminal is connected to reverse osmosis membrane assembly 4, and the first accurate filter 2 and reverse osmosis membrane assembly 4 connecting pipeline are equipped with high-pressure pump 5; The permeate outlet of reverse osmosis membrane assembly 4 is connected to produces water tank 6, concentrated solution is connected to pretreatment unit 7, pretreatment unit 7 output terminal is connected to the second accurate filter 8, second accurate filter 8 output terminal is connected to reverse osmosis concentrated liquid film assembly 9, second accurate filter 8 and reverse osmosis concentrated liquid membrane module 9 connecting pipeline are equipped with high-pressure pump 10, the permeate output terminal of reverse osmosis concentrated liquid film assembly 9 is connected to and produces water tank 6, and concentrated solution goes back to place and to dissolve process.
All recycle pump is housed, for the flow control of film main frame in described reverse osmosis membrane assembly 4 and reverse osmosis concentrated liquid film assembly 9.
The two ends of described reverse osmosis membrane assembly 4 and reverse osmosis concentrated liquid film assembly 9 are equipped with Membrane cleaning equipment water-in 11 and water outlet 12.
As shown in Figure 1, the working process of aforesaid device is: first the water outlet through nanofiltration process is sent into reverse osmosis membrane assembly 4 from raw water box 1 and carry out concentrating and separating and obtain reverse osmosis concentrated liquid, this system adopts the mode of membrane sepn to carry out concentrating and separating, operating pressure conditions is (15-40) bar, water molecule energy is through film, and the material such as the monovalent salt of lower concentration and small organic molecule is trapped in concentrated solution, this unit can by Waste water concentrating 2 ~ 10 times, and Water Sproading rate is 70-80%;
Then the reverse osmosis concentrated liquid obtained is sent into pretreatment unit 7, add chemical reagent, water quality regulation pH to 10-12, carries out precipitin reaction, removes calcium, magnesium, SO
4 2-, silicon etc., to alleviate the risk of reverse osmosis concentrated liquid scaling, be beneficial to concentrating and separating.
Finally the water outlet produced after pre-treatment being sent into reverse osmosis concentrated liquid film assembly 9 unites concentrated further, operating pressure conditions is (20-60) bar, water molecule energy is through film, the reverse osmosis produced water rate of recovery can be improved and reduce concentrated liquid measure, can by concentrated solution reconcentration 2 ~ 5 times, Water Sproading rate is between 60-80%; The filtered solution that reverse osmosis concentration liquid treating system produces, sends reverse osmosis produced water back to, improves the overall Water Sproading rate of reverse osmosis system.
The present invention adopts reverse osmosis dope reconcentration technology to process reverse osmosis concentrated liquid, the degree of dissolving in concentrated solution decrement to incineration plant factory can be made, and improve Water Sproading rate, running cost is relatively low, reverse osmosis entirety can be produced Water Sproading rate simultaneously and accomplish 90%, the more existing reverse osmosis produced water rate of recovery significantly improves, and the high power achieving water reclaims; Greatly reduce concentrated liquid measure in addition, can by concentrated solution decrement to 10%, this residue concentrated solution can be used as flyash curing humidification, fume treatment or lime and sizes mixing, and can meet place and to dissolve the ability to bear of process, reduce processing costs, economic benefit and obvious environment benefit.
Claims (8)
1. a percolate reverse osmosis concentration liquor treating process, is characterized in that, it comprises following step:
(1) the water outlet feeding reverse osmosis system through nanofiltration process is carried out concentrating and separating and obtain reverse osmosis concentrated liquid;
(2) reverse osmosis concentrated liquid step (1) obtained sends into pretreatment unit, carries out water quality regulation;
(3) reverse osmosis concentration liquid treating system is sent in the water outlet produced after pre-treatment in step ((2)) to concentrate further, improve the rate of recovery of reverse osmosis produced water and reduce concentrated liquid measure.
2. a kind of percolate reverse osmosis concentration liquor treating process as claimed in claim 1, it is characterized in that: in described step (1), reverse osmosis system is sent in the water outlet through nanofiltration process, this system adopts the mode of membrane sepn to carry out concentrating and separating, and operating pressure conditions is (15-40) bar.
3. a kind of percolate reverse osmosis concentration liquor treating process as claimed in claim 1, is characterized in that: in described step ((2)), pretreatment unit carries out water quality regulation pH to 10-12, carries out precipitation and removes calcium, magnesium, SO
4 2-, silicon.
4. a kind of percolate reverse osmosis concentration liquor treating process as claimed in claim 1, is characterized in that: the operating pressure conditions that the water outlet feeding reverse osmosis concentration liquid treating system produced after pre-treatment in described step (3) concentrates further is (20-60) bar.
5. a kind of percolate reverse osmosis concentration liquor treating process as claimed in claim 1, it is characterized in that: in described step (3), the filtered solution that reverse osmosis concentration liquid treating system produces, sends reverse osmosis produced water back to, improves the overall Water Sproading rate of reverse osmosis system.
6. for the specific equipment of above-mentioned percolate reverse osmosis concentration liquor treating process, it is characterized in that: it comprises raw water box (1), described raw water box (1) output terminal is connected with the first accurate filter (2), raw water box (1) and the connecting pipeline of the first accurate filter (2) are equipped with intake pump (3), first accurate filter (2) output terminal is connected to reverse osmosis membrane assembly (4), first accurate filter (2) and reverse osmosis membrane assembly (4) connecting pipeline are equipped with high-pressure pump (5), the permeate outlet of reverse osmosis membrane assembly (4) is connected to produces water tank (6), concentrated solution is connected to pretreatment unit (7), pretreatment unit (7) output terminal is connected to the second accurate filter (8), second accurate filter (8) output terminal is connected to reverse osmosis concentrated liquid film assembly (9), second accurate filter (8) and reverse osmosis concentrated liquid membrane module (9) connecting pipeline are equipped with high-pressure pump (10), the permeate output terminal of reverse osmosis concentrated liquid film assembly (9) is connected to and produces water tank (6), concentrated solution goes back to place and to dissolve process.
7. as the specific equipment of above-mentioned percolate reverse osmosis concentration liquor treating process according to claim 6, it is characterized in that: in described reverse osmosis membrane assembly (4) and reverse osmosis concentrated liquid film assembly (9), all recycle pump is housed, for the flow control of film main frame.
8., as the specific equipment of above-mentioned percolate reverse osmosis concentration liquor treating process according to claim 6, it is characterized in that: the two ends of described reverse osmosis membrane assembly (4) and reverse osmosis concentrated liquid film assembly (9) are equipped with Membrane cleaning equipment water-in (11) and water outlet (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410449214.7A CN104230051A (en) | 2014-09-04 | 2014-09-04 | Landfill leachate reverse osmosis concentrated solution treatment process and special equipment thereof |
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| CN201410449214.7A CN104230051A (en) | 2014-09-04 | 2014-09-04 | Landfill leachate reverse osmosis concentrated solution treatment process and special equipment thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399854A (en) * | 2018-12-10 | 2019-03-01 | 厦门市天泉鑫膜科技股份有限公司 | Liquid-film method zero-emission treatment process and integration apparatus is concentrated in landfill leachate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626314A (en) * | 2013-11-06 | 2014-03-12 | 上海晶宇环境工程有限公司 | Technology for treating nanofiltration concentrated solution of garbage leachate and special device |
| CN204111469U (en) * | 2014-09-04 | 2015-01-21 | 上海晶宇环境工程有限公司 | Percolate reverse osmosis concentrated liquid process specific equipment |
-
2014
- 2014-09-04 CN CN201410449214.7A patent/CN104230051A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626314A (en) * | 2013-11-06 | 2014-03-12 | 上海晶宇环境工程有限公司 | Technology for treating nanofiltration concentrated solution of garbage leachate and special device |
| CN204111469U (en) * | 2014-09-04 | 2015-01-21 | 上海晶宇环境工程有限公司 | Percolate reverse osmosis concentrated liquid process specific equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399854A (en) * | 2018-12-10 | 2019-03-01 | 厦门市天泉鑫膜科技股份有限公司 | Liquid-film method zero-emission treatment process and integration apparatus is concentrated in landfill leachate |
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Application publication date: 20141224 |
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