CN114315028A - Landfill leachate treatment process - Google Patents
Landfill leachate treatment process Download PDFInfo
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- CN114315028A CN114315028A CN202111634364.1A CN202111634364A CN114315028A CN 114315028 A CN114315028 A CN 114315028A CN 202111634364 A CN202111634364 A CN 202111634364A CN 114315028 A CN114315028 A CN 114315028A
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- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 23
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 40
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 22
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 20
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 20
- 239000011574 phosphorus Substances 0.000 claims description 20
- 238000001223 reverse osmosis Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229910052785 arsenic Inorganic materials 0.000 claims description 12
- -1 phosphorus ions Chemical class 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 239000010865 sewage Substances 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims description 2
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 claims 1
- 229910001430 chromium ion Inorganic materials 0.000 claims 1
- 238000001728 nano-filtration Methods 0.000 abstract description 23
- 150000002739 metals Chemical class 0.000 abstract description 4
- 239000010419 fine particle Substances 0.000 abstract description 3
- 238000005325 percolation Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 14
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 12
- 229910052793 cadmium Inorganic materials 0.000 description 11
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 11
- 239000000706 filtrate Substances 0.000 description 10
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a landfill leachate treatment process, which belongs to the technical field of landfill treatment, and comprises the following steps of adding a metal removal step after two-stage denitrification, adding magnesium sulfate and calcium aluminate as metal removal agents in the traditional landfill treatment processes of two-stage denitrification, ultrafiltration, nanofiltration, percolation and the like, so that harmful metals in the landfill leachate can be effectively taken out and are harmless, fine particles in the landfill leachate are effectively deposited in the metal removal step, the subsequent ultrafiltration and nanofiltration treatment efficiency is improved, and the treatment capacity of the landfill leachate can be improved by more than 20%.
Description
Technical Field
The invention belongs to the technical field of garbage treatment, and particularly relates to a garbage leachate treatment process.
Background
The landfill leachate is high-concentration organic wastewater which is formed by deducting the saturated water holding capacity of garbage and a soil covering layer from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water and passing through the garbage layer and the soil covering layer. The composition is complex, the pollutant concentration is high, the chromaticity is large, the toxicity is strong, the organic pollutant is abundant, the heavy metal pollutant is also contained, if the treatment is improper, the quality of surface water is influenced, and underground water is polluted. The nature of landfill leachate varies with the local climate and the operation time of the landfill, and how to properly treat the landfill is a very difficult problem in the design, operation and management of the landfill. In recent years, with the improvement of living standard of people, the total amount of urban garbage is increased year by year, so that many places are forced to build more new garbage landfills and incineration plants, and the problem of garbage leachate treatment is gradually troublesome, which is just an urgent environmental problem.
The leachate is organic wastewater with high concentration, which not only contains carcinogens, but also more than twenty toxic and harmful pollutants are listed in a black list of environment priority pollutants, and the components are complex. The landfill leachate with the characteristics of large water quality and water quantity fluctuation is used as a byproduct in the garbage treatment process, if the landfill leachate is not treated properly, the atmosphere, surface water and underground water can be seriously polluted, secondary pollution is caused, and the environment and human health are seriously influenced.
The production amount of the landfill leachate is related to the geographical position of a landfill site, the hydrological conditions, seasons and climate changes of the area, and is also related to the nature of the landfill, the water content of the landfill site, the landfill mode, the landfill time and the like, so the leachate has the characteristic of large water quality and water quantity change.
Percolation with longer landfill timeThe quality of the liquid can change obviously. According to the operation time of a landfill, landfill leachate can be broadly divided into three categories: young percolate (the landfill time is less than 5 years), middle-aged percolate (the landfill time is 5-10 years), and old percolate (the landfill time is more than 10 years). The quality of the percolate generated by a young landfill is characterized in that: higher color, relatively lower pH, COD and BOD5The concentration of the leachate is higher, the ratio of the concentration to the concentration of the heavy metal ions is also relatively higher, and the water quality of the leachate of the old refuse landfill is characterized in that: the chroma is large, the pH value is generally between 6 and 8, the pH value is close to neutral or alkalescence, COD and BOD5The concentration of (a) is relatively low, the ratio of the two is also relatively low, the biochemical capability is poor, and the concentration of heavy metal ions also begins to decrease. The water quality characteristics of the percolate generated by the middle-aged landfill are between those of the percolate of young and old. In addition, because domestic garbage is buried without strict classification and screening, the content of metal ions in the leachate reaches various levels, the heavy metal content is high, and the leachate contains various toxic and harmful heavy metal ions such as chromium, cadmium, lead, arsenic and the like.
Disclosure of Invention
In order to overcome the problems in the background art, the invention provides a landfill leachate treatment process, which is characterized in that a metal removal process is added in the conventional landfill treatment process, so that harmful metals in the landfill leachate can be effectively taken out and are harmless, fine particles in the landfill leachate are effectively deposited in the metal removal process, the subsequent ultrafiltration and nanofiltration treatment efficiency is improved, and the treatment capacity of the landfill leachate can be improved by more than 20%.
In order to realize the purpose, the invention is realized by the following technical scheme:
the landfill leachate treatment process comprises the following steps:
(1) two-stage denitrification biological treatment;
(2) the metal removal specifically comprises the following steps: adding magnesium sulfate into the sludge after denitrification treatment, fully stirring, adding a flocculating agent, and filtering;
(3) ultrafiltration;
(4) nano-filtering;
(5) reverse osmosis, returning the reverse osmosis concentrated solution to the step (2), and sending the clear solution to a clear water tank.
Furthermore, the adding amount of the magnesium sulfate and phosphorus ions in the sewage are in a ratio of 1: 1-1.2 molar weight.
Furthermore, the concentration of phosphorus ions in the landfill leachate needs to be more than 50% of the total molar concentration of chromium, cadmium, lead and arsenic ions, and if the total molar concentration of the chromium, cadmium, lead and arsenic ions cannot be reached, phosphoric acid or phosphate needs to be added for adjustment.
Further, calcium aluminate is added in the step (2) at the same time; the molar ratio of the calcium aluminate to the magnesium sulfate is 1: 3-6.
The invention has the beneficial effects that:
according to the invention, the magnesium sulfate and the calcium aluminate are used, the metal removing process is added, so that not only can harmful metals in the landfill leachate be effectively taken out and harmlessly treated, but also fine particles in the landfill leachate are effectively deposited in the metal removing process, the subsequent ultrafiltration and nanofiltration treatment efficiency is improved, and the treatment capacity of the landfill leachate can be improved by more than 20%.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person.
The landfill leachate treatment process comprises the following steps:
(1) two-stage denitrification biological treatment, wherein most of ammonia nitrogen is removed through denitrification treatment.
(2) The metal removal specifically comprises the following steps:
detecting the concentrations of chromium, cadmium, lead, arsenic and phosphorus in the garbage leachate after nitration treatment, and supplementing phosphoric acid into the garbage leachate if the molar concentration of phosphorus is less than 50% of the total molar concentration of chromium, cadmium, lead and arsenic ions;
adding magnesium sulfate and phosphorus ions into the landfill leachate in a proportion of 1: magnesium sulfate was added at a molar ratio of 1-1.2.
Because a large amount of ammonia nitrogen exists in the landfill leachate, the ammonia nitrogen is difficult to be completely removed through nitrification and denitrification, when magnesium sulfate is added, ammonium, phosphorus and magnesium react and precipitate is rapidly formed, and the residual ammonia nitrogen and phosphorus in the landfill leachate are consumed.
As a preferred technical solution, calcium aluminate is added simultaneously with magnesium sulfate, and by adding calcium aluminate, the molar ratio of calcium aluminate to magnesium sulfate is 1: 3-6, the magnesium sulfate not only reacts with ammonia nitrogen and phosphorus, but also has chelation effect on harmful metal ions in the landfill leachate, and is subjected to flocculation precipitation after a flocculating agent is added subsequently.
Filtering, and filtering to remove precipitate.
(3) And (3) ultrafiltration, wherein the filtrate obtained in the step (2) is further subjected to ultrafiltration, and the concentrated solution after ultrafiltration is returned to the step (1).
(4) Nanofiltration, namely carrying out nanofiltration on the concentrated solution in the step (3); nanofiltration can retain non-degradable macromolecular organic matters in the concentrated solution and simultaneously discharge salt along with the effluent.
(5) Reverse osmosis, returning the reverse osmosis concentrated solution to the step (2), and sending the clear solution to a clear water tank. Through reverse osmosis, partial residual COD, ammonia nitrogen and the like can be removed.
Example 1
The pH value of old landfill leachate of a certain garbage plant is 6.2, and ammonia nitrogen is 3500 mg/L, CODCr15000, cadmium 150ppm, lead 123ppm, arsenic 29ppm and phosphorus 80 mg/L.
Firstly, performing two-stage denitrification treatment on the landfill leachate, adding magnesium sulfate with the molar weight 1.1 times that of phosphorus and calcium aluminate with the molar weight 30% of the magnesium sulfate after the two-stage denitrification treatment, stirring for 3 hours at 68 ℃, fully reacting, filtering after the reaction is finished, and clarifying the filtrate without visible impurities. The detection results show that the filtrate contains 38.5 mg/L of ammonia nitrogen, 3ppm of cadmium, no lead, 9.2ppm of arsenic and 2mg/L of phosphorus.
And (3) carrying out ultrafiltration treatment on the filtrate by using ultrafiltration equipment, returning the concentrated solution to a two-stage denitrification treatment process, conveying the ultrafiltration clear solution to nanofiltration equipment for nanofiltration, returning the nanofiltration concentrated solution to a metal removal step, carrying out reverse osmosis on the nanofiltration clear solution, conveying the reverse osmosis clear solution to a clear solution tank for standard discharge, conveying the concentrated solution to concentration and evaporation, and burying evaporation residues.
Comparative example 1 (calcium aluminate is not added when metals are removed)
The same landfill leachate as that in example 1 is treated, two-stage denitrification treatment is firstly carried out on the landfill leachate, magnesium sulfate with the molar weight 1.1 times of that of phosphorus is added after the two-stage denitrification treatment, the mixture is stirred for 3 hours at 68 ℃ for full reaction, the mixture is filtered after the reaction is finished, and the filtrate is clear and has no visible impurities. The filtrate was measured for 42.3 mg/L ammonia nitrogen, 87 ppm cadmium, 94ppm lead, 12ppm arsenic and 62 mg/L phosphorus.
And (3) carrying out ultrafiltration treatment on the filtrate by using ultrafiltration equipment, returning the concentrated solution to a two-stage denitrification treatment process, conveying the ultrafiltration clear solution to nanofiltration equipment for nanofiltration, returning the nanofiltration concentrated solution to a metal removal step, carrying out reverse osmosis on the nanofiltration clear solution, conveying the reverse osmosis clear solution to a clear solution tank for standard discharge, conveying the concentrated solution to concentration and evaporation, and burying evaporation residues.
Comparative example 2 (removal of Metal removal step)
The same landfill leachate as that in example 1 is treated, two-stage denitrification treatment is firstly carried out on the landfill leachate, ultrafiltration treatment is carried out by using ultrafiltration equipment after the two-stage denitrification treatment, concentrated solution returns to the two-stage denitrification treatment process, ultrafiltration clear solution is sent to nanofiltration equipment for nanofiltration, the nanofiltration concentrated solution returns to a metal removal step, reverse osmosis is carried out on the nanofiltration clear solution, the reverse osmosis clear solution is sent to a clear solution tank to be discharged after reaching the standard, the concentrated solution is sent to be concentrated and evaporated, and evaporation residues are buried.
And detecting to obtain reverse osmosis clear liquid containing ammonia nitrogen 62, cadmium 148ppm, lead 122ppm, arsenic 30ppm and phosphorus 67 mg/L.
In addition, after the metal removal step is cancelled, the operation period of the ultrafiltration equipment of the same equipment is shortened by more than half.
Example 2
The pH value of old landfill leachate of a certain landfill plant is 6.8, and ammonia nitrogen is 2800 mg/L, CODCr13000, cadmium is 129ppm, lead is 346ppm, arsenic is 94ppm, and phosphorus is 102 mg/L.
Firstly, performing two-stage denitrification treatment on the landfill leachate, adding magnesium sulfate and magnesium sulfate which are 1.2 times of the molar weight of phosphorus and calcium aluminate with the molar weight of the magnesium sulfate being 18 percent after the two-stage denitrification treatment, stirring for 3 hours at 68 ℃, fully reacting, filtering after the reaction is finished, and clarifying the filtrate without visible impurities. Detecting to obtain filtrate containing ammonia nitrogen 40 mg/L, cadmium 12ppm, lead 0.6ppm, arsenic 11ppm, and phosphorus 8 mg/L.
And (3) carrying out ultrafiltration treatment on the filtrate by using ultrafiltration equipment, returning the concentrated solution to a two-stage denitrification treatment process, conveying the ultrafiltration clear solution to nanofiltration equipment for nanofiltration, returning the nanofiltration concentrated solution to a metal removal step, carrying out reverse osmosis on the nanofiltration clear solution, conveying the reverse osmosis clear solution to a clear solution tank for standard discharge, conveying the concentrated solution to concentration and evaporation, and burying evaporation residues.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (4)
1. A landfill leachate treatment process is characterized by comprising the following steps:
two-stage denitrification biological treatment;
the metal removal specifically comprises the following steps: adding magnesium sulfate into the sludge after denitrification treatment, fully stirring, adding a flocculating agent, and filtering;
ultrafiltration;
nano-filtering;
reverse osmosis, returning the reverse osmosis concentrated solution to the step (2), and sending the clear solution to a clear water tank.
2. The landfill leachate treatment process according to claim 1, wherein: the adding amount of the magnesium sulfate and phosphorus ions in the sewage are in a proportion of 1: 1-1.2 molar weight.
3. The landfill leachate treatment process according to claim 2, wherein: the concentration of phosphorus ions in the landfill leachate needs to be more than 50 percent of the total molar concentration of chromium ions, cadmium ions, lead ions and arsenic ions, and if the total molar concentration of the phosphorus ions is not more than 50 percent, phosphoric acid or phosphate needs to be added for adjustment.
4. The landfill leachate treatment process according to claim 2, wherein: simultaneously adding calcium aluminate in the step (2); the molar ratio of the calcium aluminate to the magnesium sulfate is 1: 3-6.
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| CN202111634364.1A CN114315028A (en) | 2021-12-29 | 2021-12-29 | Landfill leachate treatment process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070003370A1 (en) * | 2005-07-04 | 2007-01-04 | Liao Zhi Min | A method for treating landfill leachate |
| CN101891336A (en) * | 2010-06-25 | 2010-11-24 | 北京伊普国际水务有限公司 | System and method for leachate treatment in sanitary landfill |
| CN102276041A (en) * | 2007-03-30 | 2011-12-14 | 狮王株式会社 | Water-treating agent and method of treating water |
| CN105693029A (en) * | 2016-03-21 | 2016-06-22 | 珠海市海宜环境投资有限公司 | Landfill leachate treatment process |
| CN109867344A (en) * | 2019-03-20 | 2019-06-11 | 江南大学 | A kind of processing method of landfill leachate |
-
2021
- 2021-12-29 CN CN202111634364.1A patent/CN114315028A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070003370A1 (en) * | 2005-07-04 | 2007-01-04 | Liao Zhi Min | A method for treating landfill leachate |
| CN102276041A (en) * | 2007-03-30 | 2011-12-14 | 狮王株式会社 | Water-treating agent and method of treating water |
| CN101891336A (en) * | 2010-06-25 | 2010-11-24 | 北京伊普国际水务有限公司 | System and method for leachate treatment in sanitary landfill |
| CN105693029A (en) * | 2016-03-21 | 2016-06-22 | 珠海市海宜环境投资有限公司 | Landfill leachate treatment process |
| CN109867344A (en) * | 2019-03-20 | 2019-06-11 | 江南大学 | A kind of processing method of landfill leachate |
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Application publication date: 20220412 |