CN108715491A - A kind of processing method of nanofiltration concentrate to landfill leachate - Google Patents
A kind of processing method of nanofiltration concentrate to landfill leachate Download PDFInfo
- Publication number
- CN108715491A CN108715491A CN201810641228.7A CN201810641228A CN108715491A CN 108715491 A CN108715491 A CN 108715491A CN 201810641228 A CN201810641228 A CN 201810641228A CN 108715491 A CN108715491 A CN 108715491A
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- China
- Prior art keywords
- processing method
- value
- level
- landfill leachate
- coagulation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A kind of processing method of nanofiltration concentrate to landfill leachate, is related to technical field of sewage, first adjusts the pH value of the nanofiltration concentrate of landfill leachate to being mixed with trivalent iron salt after 6 and carries out first order coagulation, layered, obtains level-one liquid product；The pH value of level-one liquid product is adjusted to after 5 again, agitated progress second level coagulation is layered, water after acquirement processing.By the two-stage coagulating treatment of the present invention, most of hardly degraded organic substance is removed in percolate, experiments have shown that, COD removal rates can reach 67.9%, and the COD removed is removed in the form of precipitating, and concentrate, producing water ratio 100% is not present.Two-stage coagulation equipment is simple, and spoilage is low, to which capital construction and operation cost are very low and easy to operate.
Description
Technical field
The present invention relates to technical field of sewage, and in particular to the technology handled the percolate of rubbish.
Background technology
Currently, the conventional process flow of landfill leachate is：Successively use anaerobism at obtain, membrane bioreactor（MBR）With
Nanofiltration（NF）Three cohesive process of processing, reach after pending《Household refuse landfill sites contamination control standard》（GB 16889—
2008）Standard, could direct emission.This processing procedure generates 10%~30% nanofiltration concentrate, containing a large amount of difficult to degrade organic
Object, it is difficult to further handle, if direct emission, environment will be caused seriously to pollute.
Invention content
The purpose of the present invention is for the problem that nanofiltration concentrate amount it is big, and be difficult to be further processed, provide it is a kind of effectively
Processing method.
Processing method of the present invention includes the following steps：
1）The pH value of the nanofiltration concentrate of landfill leachate is adjusted to being mixed with trivalent iron salt after 6 and carries out first order coagulation, warp
Layering obtains level-one liquid product；
2）The pH value of level-one liquid product is adjusted to after 5, agitated progress second level coagulation is layered, water after acquirement processing.
After ferric ion is dissolved in water, it may occur that the polymer of the hydrolysis of following formula and polymerisation, generation carries not same amount
Positive electron.Since the ingredient of main hardly degraded organic substance in concentrated water is humic acid, and humic acid is negatively charged, it is easy to by three
The Polymer adsorption that valence iron generates.Coagulating sedimentation is generated due to charge neutrality later.
Ferric hydrolysis degree is different and different according to the pH value of water.When pH < 3, ferric iron is with Fe (H2O)6 3+Shape
Formula exists.Step 1）During progress, with the hydrolysis of iron ion, OH-Constantly consumption, pH value constantly decline.Step 1）Produce water
PH is 2.54, that is to say, that step 1）Produce (the H containing Fe in water2O)6 3+.Step 2）In, alkali is added, promotes it further to hydrolyze poly-
It closes, to remove remaining organic matter, and ferric ion is thoroughly precipitated.
By the two-stage coagulating treatment of the present invention, most of hardly degraded organic substance is removed in percolate, experiments have shown that,
COD removal rates can reach 67.9%, and the COD removed is removed in the form of precipitating, and concentrate, producing water ratio 100% is not present.Two-stage
Coagulation Method equipment is simple, and spoilage is low, to which capital construction and operation cost are very low and easy to operate.
Further, trivalent iron salt of the present invention can be selected from ferric chloride hexahydrate.
The step 1）In, pH value is adjusted using hydrochloric acid or sulfuric acid.Experiments have shown that water of the different coagulants in different quality
In have different Optimal pHs, under Optimal pH, coagulation effect is best.Step 1）In, pH=6, coagulation effect is best, is discharged COD
Removal rate highest.
When the mixing, the mixing matter of COD and iron ion in trivalent iron salt in the nanofiltration concentrate of the landfill leachate
Amount is than being 1: 0.53.COD removal rate highests.
In order to further increase efficiency and effect, when carrying out first order coagulation, first quickly stirred with 300r/min speed
Then 1min is stirred for 10min with the speed of 80 r/min.
The step 2）In, pH value is adjusted using caustic soda or white lime.Add alkali, further gathering for remaining iron ion can be promoted
It closes, coagulating sedimentation.Through experiment, pH is adjusted to 5, COD removal rate highests.
In addition, it is necessary to which explanation, the present invention can coordinate other processing methods to be used together.As effluent quality standard is
《Integrated wastewater discharge standard》（GB8978-1996）Primary standard or《Household refuse landfill sites contamination control standard》（GB
16889—2008）Standard may be selected further biochemical treatment after two-stage coagulation water outlet progress advanced oxidation.Due to major part
Removal of the hardly degraded organic substance in the coagulation stage so that water outlet COD is down to 100 mg/L and is possibly realized.
Specific implementation mode
Analyze COD contents in the nanofiltration concentrate of landfill leachate：1169~1185 g/mL.
The nanofiltration concentrate sample of above-mentioned landfill leachate is tested below.
It takes the nanofiltration concentrate of the landfill leachate of 200mL in beaker, using sulfuric acid or salt acid for adjusting pH value to 6, adds
Enter 0.6g ferric chloride hexahydrates, 1min is quickly first stirred with 300r/min speed, is then stirred for the speed of 80 r/min
10min, then through stratification 2h, supernatant, i.e. level-one liquid product are taken, survey its COD removal rate 53.8%.
It takes above-mentioned 200mL level-ones liquid product in beaker, pH value is adjusted to 5, first with 300r/min speed using caustic soda
Quickly stirring 1min, is then stirred for 10min, then through stratification 2h, take supernatant, i.e. two level liquid with the speed of 80 r/min
Phase product surveys its COD removal rate 30.6%.
By the above two-stage coagulation system COD total removal rates up to 67.9%, two level liquid product COD is 375~380 mg/
L meets《Integrated wastewater discharge standard》（GB8978-1996）Three-level discharges water quality standard.
It is computed, the embodiment, operation cost only 2.13 yuan/ton of water.
Claims (6)
1. a kind of processing method of nanofiltration concentrate to landfill leachate, it is characterised in that include the following steps：
1）The pH value of the nanofiltration concentrate of landfill leachate is adjusted to being mixed with trivalent iron salt after 6 and carries out first order coagulation, warp
Layering obtains level-one liquid product；
2）The pH value of level-one liquid product is adjusted to after 5, agitated progress second level coagulation is layered, water after acquirement processing.
2. processing method according to claim 1, it is characterised in that the trivalent iron salt is ferric chloride hexahydrate.
3. processing method according to claim 1, it is characterised in that the step 1）In, pH is adjusted using hydrochloric acid or sulfuric acid
Value.
4. processing method according to claim 1, it is characterised in that the step 1）In, when the mixing, the rubbish
The mixing quality ratio of COD and iron ion in trivalent iron salt is 1: 0.53 in the nanofiltration concentrate of percolate.
5. according to the processing method described in Claims 2 or 3 or 4, it is characterised in that first quickly stirred with 300r/min speed
Then 1min is stirred for 10min with the speed of 80 r/min.
6. processing method according to claim 1, it is characterised in that the step 2）In, it is adjusted using caustic soda or white lime
PH value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810641228.7A CN108715491A (en) | 2018-06-21 | 2018-06-21 | A kind of processing method of nanofiltration concentrate to landfill leachate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810641228.7A CN108715491A (en) | 2018-06-21 | 2018-06-21 | A kind of processing method of nanofiltration concentrate to landfill leachate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108715491A true CN108715491A (en) | 2018-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810641228.7A Pending CN108715491A (en) | 2018-06-21 | 2018-06-21 | A kind of processing method of nanofiltration concentrate to landfill leachate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110143688A (en) * | 2019-04-24 | 2019-08-20 | 常州润成环境科技有限公司 | Nanofiltration concentrate processing method |
| FR3100536A1 (en) | 2019-09-05 | 2021-03-12 | Dfi-Elec | Process for treating a landfill leachate or a liquid leachate concentrate or sludge from leachate and device for implementing the process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015102153A1 (en) * | 2014-01-02 | 2015-07-09 | 주식회사 엠티씨엔씨 | Method for purifying polluted water using liquid separated from food waste |
| CN106242163A (en) * | 2016-08-18 | 2016-12-21 | 江苏环保产业技术研究院股份公司 | A kind of processing method of percolate embrane method concentrated solution |
-
2018
- 2018-06-21 CN CN201810641228.7A patent/CN108715491A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015102153A1 (en) * | 2014-01-02 | 2015-07-09 | 주식회사 엠티씨엔씨 | Method for purifying polluted water using liquid separated from food waste |
| CN106242163A (en) * | 2016-08-18 | 2016-12-21 | 江苏环保产业技术研究院股份公司 | A kind of processing method of percolate embrane method concentrated solution |
Non-Patent Citations (1)
| Title |
|---|
| 吴国娟: "二级混凝—沉淀强化垃圾渗滤液预处理研究", 《中国优秀博硕士学位论文全文数据库 (硕士) 工程科技Ⅰ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110143688A (en) * | 2019-04-24 | 2019-08-20 | 常州润成环境科技有限公司 | Nanofiltration concentrate processing method |
| FR3100536A1 (en) | 2019-09-05 | 2021-03-12 | Dfi-Elec | Process for treating a landfill leachate or a liquid leachate concentrate or sludge from leachate and device for implementing the process |
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Application publication date: 20181030 |
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