CN112551794A - Method and system for treating high ammonia nitrogen in landfill leachate evaporation effluent - Google Patents
Method and system for treating high ammonia nitrogen in landfill leachate evaporation effluent Download PDFInfo
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- CN112551794A CN112551794A CN202011513377.9A CN202011513377A CN112551794A CN 112551794 A CN112551794 A CN 112551794A CN 202011513377 A CN202011513377 A CN 202011513377A CN 112551794 A CN112551794 A CN 112551794A
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- ammonia nitrogen
- landfill leachate
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
The invention provides a method and a system for treating high ammonia nitrogen in landfill leachate evaporated water, and the method for treating the high ammonia nitrogen in the landfill leachate evaporated water comprises the following steps: adding alkali into the evaporated effluent of the landfill leachate MVR to adjust the PH value to be alkaline, converting ammonia nitrogen in the evaporated effluent of the landfill leachate MVR into free ammonia, entering the wastewater side of the gaseous membrane separation device, simultaneously enabling absorption liquid to enter the absorption side of the gaseous membrane separation device, enabling the free ammonia in the wastewater side to enter the absorption side through a hydrophobic microporous membrane of the gaseous membrane separation device to perform quick irreversible reaction with the absorption liquid, and further achieving the purpose of removing high ammonia nitrogen.
Description
Technical Field
The invention relates to a technology for treating landfill leachate evaporation effluent, in particular to a method and a system for treating high ammonia nitrogen in landfill leachate evaporation effluent.
Background
The landfill leachate refers to sewage formed by leaching water generated by decomposition of organic substances in the garbage and free water, precipitation, infiltrated underground water and the like in the garbage in the landfill and stacking process, and when the humidity of a garbage stack body exceeds the water holding capacity of the garbage stack body, inorganic pollutants such as suspended or dissolved organic pollutants and heavy metals in the garbage stack body are dissolved out together, so that the leachate is generated.
With the gradual improvement of economic level and quality of life of people, the country attaches more importance to the environmental protection career, and new sewage discharge standard is continuously provided, so that the current environmental protection technology industry faces unprecedented opportunities and challenges. In recent years, GB16889-1997 and GB16889-2008 'control standard for pollutants for domestic refuse landfill' are established in succession in China, and the treatment of landfill leachate is increasingly strict.
The MVR treatment process technology has the advantages of small occupied area, high equipment automation degree, simple process flow, stable and reliable operation, strong shock resistance, short construction period, basically no influence of external environment in the operation process, no generation of concentrated solution and the like in the aspect of landfill leachate treatment, and occupies larger and larger market share in the aspect of landfill leachate treatment.
However, when the landfill leachate is treated by MVR evaporation, ammonia nitrogen in the landfill leachate enters steam and finally exists in condensed water, so that the ammonia nitrogen value of effluent is high, and the operation of engineering projects cannot be influenced by discharge. The existing matched process for removing ammonia nitrogen by MVR evaporation is a sulfuric acid scrubbing system, ammonia nitrogen-containing steam evaporated by MVR is introduced into a sulfuric acid scrubbing tower, and ammonia nitrogen in the steam is converted into ammonium sulfate salt by using sulfuric acid solution to remove the ammonia nitrogen.
Such a sulfuric acid scrubbing system has the following major problems:
1. the temperature of the ammonia nitrogen-containing steam evaporated by MVR is 100-; meanwhile, the sulfuric acid gas washing tower adopts 5-10% sulfuric acid solution for gas washing, and the sulfuric acid gas washing tower is required to resist corrosion; the requirements result in high requirements on the material of the sulfuric acid scrubbing tower, and the equipment cost is high.
2. The equipment is easy to block, the concentration of ammonium sulfate in the sulfuric acid gas washing tower is gradually increased to supersaturation, and the blockage of the sulfuric acid gas washing tower and the matched equipment is easy to cause.
3. The process stability is poor, the ammonia nitrogen removal effect is poor due to the blockage of a sulfuric acid scrubbing tower or the low concentration of sulfuric acid in the scrubbing tower, and the evaporation condensate water does not reach the standard.
Disclosure of Invention
The invention aims to provide a method for treating high ammonia nitrogen in evaporated water of landfill leachate, aiming at solving the problems of high equipment cost, easy equipment blockage and poor process stability of the existing sulfuric acid scrubbing system for treating the high ammonia nitrogen evaporated from the landfill leachate.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for treating high ammonia nitrogen in landfill leachate evaporation effluent comprises the following steps: add alkali regulation pH value to basicity in evaporating the waste leachate MVR effluent, evaporate the ammonia nitrogen of aquatic with the waste leachate MVR and change into free state ammonia, get into gaseous state membrane separator's waste water side, the absorption liquid gets into gaseous state membrane separator's absorption side simultaneously, free state ammonia in the waste water side gets into the absorption side through gaseous state membrane separator's hydrophobic microporous membrane and takes place quick irreversible reaction with the absorption liquid, thereby reach the purpose of high ammonia nitrogen desorption, final effluent is up to standard and is discharged.
Further, the ammonia nitrogen value in the water evaporated by the landfill leachate MVR is 200-2000 mg/L.
Further, the alkali is NaOH, and the mass concentration of the alkali solution is 30-50 wt%.
Further, adding alkali into the evaporated water of the landfill leachate MVR to adjust the pH value to be alkaline, and adjusting the pH value to 11-13, preferably 12.
Further, the absorption liquid is sulfuric acid, nitric acid or hydrochloric acid, and the acid concentration is 3-5% wt.
Furthermore, the membrane selected by the gaseous membrane separation device is a hydrophobic hollow fiber microporous membrane, the thickness of the microporous membrane is 30-100 microns, and the membrane material is polypropylene or polytetrafluoroethylene.
Further, the operation pressure of the gaseous membrane separation system is 0-0.25MPa, and the operation temperature is 5-45 ℃. The preferred operating pressure is 0.1-0.15MPa and the operating temperature is 20-30 ℃.
Furthermore, after the landfill leachate MVR treated by the treatment method evaporates the effluent, the removal rate of ammonia nitrogen is more than 98%.
The invention also discloses a system for treating high ammonia nitrogen in the evaporated water of the landfill leachate, which comprises a raw water tank, a raw water lift pump, an alkali liquor tank, an alkali liquor dosing pump, a pipeline mixer, a PH value detector, a gaseous film device, an absorption liquor tank, an absorption liquor circulating pump and a water outlet tank, wherein the raw water tank is used for containing the evaporated water with high ammonia nitrogen, the alkali liquor tank is used for containing a NaOH solution, the absorption liquor tank is used for containing a sulfuric acid, nitric acid or hydrochloric acid solution, and the water outlet tank is used for containing the effluent after ammonia nitrogen removal; the outlet of the raw water tank is communicated with the inlet of the pipeline mixer through a raw water lift pump, the outlet of the alkali liquor tank is communicated with the inlet of the pipeline mixer through an alkali liquor dosing pump, and the outlet of the pipeline mixer is communicated with the raw water inlet at the upper part of the gaseous membrane device; the absorption liquid tank is communicated with an absorption liquid inlet at the bottom of the gaseous film device through an absorption liquid circulating pump, an absorption liquid outlet at the top of the gaseous film device is communicated with the upper part of the absorption liquid tank, and a water outlet at the lower part of the gaseous film device is communicated with the upper part of the water outlet tank;
be provided with the PH value detector on the pipeline between pipeline mixer and the gaseous state membrane device raw water entry, PH value detector, the electrical connection in order of control unit and alkali lye dosing pump, PH value detector feedback signal of telecommunication passes through the control unit, and the rotational speed of automatic control alkali lye dosing pump, the volume of throwing of automatically regulated alkali lye adds.
The invention relates to a method and a system for treating high ammonia nitrogen in landfill leachate evaporated water, in particular to a method and a system for treating high ammonia nitrogen in landfill leachate MVR evaporated water based on a gaseous membrane separation technology, which have the following advantages compared with the prior art:
1) the equipment cost is low, the operating pressure of the gaseous membrane separation system is 0-0.25MPa, the operating temperature is 5-45 ℃, and the equipment is low-pressure low-temperature equipment and has low equipment cost and low energy consumption.
2) The equipment is not easy to block, the cross flow filtration technology adopted by the gaseous membrane separation device continuously washes the surface of the gaseous membrane by water inflow, and the accumulation and the blocking of precipitated salt are avoided.
3) The process stability is good, the process flow of the gaseous membrane separation system is simple, the blockage is not easy, the full-automatic control can be realized, and the effluent stably reaches the standard.
In conclusion, the invention thoroughly solves the problems of high equipment requirement, high equipment cost, easy equipment blockage and poor process stability of a sulfuric acid gas washing system.
Drawings
FIG. 1 is a schematic view of a system for treating high ammonia nitrogen in landfill leachate evaporation effluent.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment discloses a system for treating high ammonia nitrogen in landfill leachate MVR evaporation effluent based on a gaseous membrane separation technology, the structure of which is shown in figure 1, and the system comprises a raw water tank 1, a raw water lift pump 2, an alkali liquor tank 3, an alkali liquor dosing pump 4, a pipeline mixer 5, a pH value detector 6, a gaseous membrane device 7, an absorption liquor tank 8, an absorption liquor circulating pump 9 and an effluent tank 10.
The outlets of the raw water tank 1 and the lye tank 3 are respectively communicated with a pipeline mixer 5, and the outlet of the pipeline mixer 5 is communicated with the raw water inlet at the upper part of the gaseous membrane device 7. Wherein, the raw water tank 1 is filled with high ammonia nitrogen evaporation effluent, and the outlet of the raw water tank 1 is communicated with the inlet of the pipeline mixer 5 through the raw water lift pump 2. An alkali liquor tank 3 is internally provided with an alkali liquor which is NaOH, and the outlet of the alkali liquor tank 3 is communicated with a pipeline mixer 5 through an alkali liquor dosing pump 4; set up PH value detector 6 between pipeline mixer 5 and the raw water entry on gaseous state membrane device 7 upper portion, PH value detector 6, the control unit and alkali lye dosing pump 4 electricity in order link, the signal of telecommunication is passed through to PH value detector 6 feedback, and the rotational speed of automatic control alkali lye dosing pump 4, the volume of throwing of automatically regulated alkali lye is added.
The absorption liquid tank 8 is used for containing sulfuric acid, nitric acid or hydrochloric acid; the absorption liquid tank 8 is communicated with an absorption liquid inlet at the bottom of the gaseous film device 7 through an absorption liquid circulating pump 9, an absorption liquid outlet at the top of the gaseous film device 7 is communicated with the upper part of the absorption liquid tank 8, and a water outlet at the lower part of the gaseous film device 7 is communicated with the upper part of the water outlet tank 10;
by adopting the system, the method for treating high ammonia nitrogen in the evaporated effluent of the landfill leachate MVR based on the gaseous membrane separation technology comprises the following steps:
the method comprises the steps of respectively feeding landfill leachate MVR evaporated water with an ammonia nitrogen value of 1016mg/L in a raw water tank 1 and a sodium hydroxide solution with a mass concentration of 50% in an alkali liquor tank 3 into a pipeline mixer 5, uniformly mixing the water and the sodium hydroxide solution through the pipeline mixer 5, and then feeding the mixed water into a raw water side of a gaseous film device 7, wherein a pH value detector 6 is arranged between the pipeline mixer 5 and a raw water inlet of the gaseous film device 7, an electric signal is fed back to a control unit by the pH value detector 6, the control unit automatically controls the rotating speed of an alkali liquor dosing pump 4, automatically adjusts the dosage of alkali liquor until the pH value of the evaporated water entering the gaseous film device 7 is 12, and ammonia nitrogen in the water evaporated by the landfill leachate MVR is converted into free ammonia; meanwhile, 5% dilute sulfuric acid in the absorption liquid tank 8 enters the absorption side of the gaseous membrane device 7 through the absorption liquid circulating pump 9, free ammonia in the raw water side enters the absorption side to react with the dilute sulfuric acid rapidly and irreversibly, wherein the operation pressure of the gaseous membrane separation system is 0.15MPa, and the operation temperature is 25 ℃. The content of ammonia nitrogen in the final effluent of the gaseous membrane system is 8mg/L, and the removal rate of the ammonia nitrogen is 99.2%.
Example 2
The embodiment discloses a method for treating high ammonia nitrogen in landfill leachate MVR evaporation effluent based on a gaseous membrane separation technology, which adopts the system of embodiment 1 and comprises the following steps:
treating the high ammonia nitrogen evaporated water of the MVR of the landfill leachate with the method, wherein the ammonia nitrogen value of the evaporated water of the MVR of the landfill leachate is 685mg/L, adding a sodium hydroxide solution with the mass concentration of 50% to adjust the PH value to 11.8, converting the ammonia nitrogen evaporated water of the MVR of the landfill leachate into free ammonia, and feeding the free ammonia into the raw water side of a gaseous membrane device; the absorption liquid is 5% hydrochloric acid, and enters the absorption side of the gaseous membrane device, the free ammonia in the raw water side enters the absorption side to react with the hydrochloric acid rapidly and irreversibly, the operation pressure of the gaseous membrane separation system is 0.12MPa, and the operation temperature is 25 ℃. The content of ammonia nitrogen in the final effluent of the gaseous membrane system is 6mg/L, and the removal rate of the ammonia nitrogen is 99.12%.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for treating high ammonia nitrogen in landfill leachate evaporation effluent is characterized by comprising the following steps: add alkali regulation pH value to basicity in evaporating the waste leachate MVR effluent, evaporate the ammonia nitrogen of aquatic with the waste leachate MVR and change into free state ammonia, get into gaseous state membrane separator's waste water side, the absorption liquid gets into gaseous state membrane separator's absorption side simultaneously, free state ammonia in the waste water side gets into the absorption side through gaseous state membrane separator's hydrophobic microporous membrane and takes place quick irreversible reaction with the absorption liquid, thereby reach the purpose of high ammonia nitrogen desorption, final effluent is up to standard and is discharged.
2. The method as claimed in claim 1, wherein the ammonia nitrogen value in the evaporated water of landfill leachate MVR is 200-2000 mg/L.
3. The method for treating high ammonia nitrogen in evaporative effluent of landfill leachate according to claim 1, wherein the alkali is NaOH.
4. The method for treating high ammonia nitrogen in landfill leachate evaporation effluent of claim 1, wherein the pH value of the landfill leachate MVR evaporation effluent is adjusted to alkaline by adding alkali, and the pH value is adjusted to 11-13.
5. The method for treating high ammonia nitrogen in evaporative effluent of landfill leachate according to claim 1, wherein the absorption solution is sulfuric acid, nitric acid or hydrochloric acid, and the acid concentration is 3% wt to 5% wt.
6. The method for treating high ammonia nitrogen in evaporative effluent of landfill leachate according to claim 1, wherein the membrane selected by the gaseous membrane separation device is a hydrophobic hollow fiber microporous membrane, the thickness of the microporous membrane is 30-100 microns, and the membrane material is polypropylene or polytetrafluoroethylene.
7. The method for treating high ammonia nitrogen in evaporative effluent of landfill leachate according to claim 1, wherein the operating pressure of the gaseous membrane separation system is 0-0.25MPa and the operating temperature is 5-45 ℃.
8. The method for treating high ammonia nitrogen in the evaporative effluent of landfill leachate according to claim 1, wherein the removal rate of ammonia nitrogen is more than 98% after the evaporative effluent of landfill leachate MVR is treated by the treatment method.
9. A system for treating high ammonia nitrogen in evaporation effluent of landfill leachate is characterized by comprising a raw water tank, a raw water lift pump, an alkali liquor tank, an alkali liquor dosing pump, a pipeline mixer, a PH value detector, a gaseous membrane device, an absorption liquor tank, an absorption liquor circulating pump and a water outlet tank, wherein an outlet of the raw water tank is communicated with an inlet of the pipeline mixer through the raw water lift pump, an outlet of the alkali liquor tank is communicated with an inlet of the pipeline mixer through the alkali liquor dosing pump, and an outlet of the pipeline mixer is communicated with a raw water inlet at the upper part of the gaseous membrane device; the absorption liquid tank is communicated with an absorption liquid inlet at the bottom of the gaseous film device through an absorption liquid circulating pump, an absorption liquid outlet at the top of the gaseous film device is communicated with the upper part of the absorption liquid tank, and a water outlet at the lower part of the gaseous film device is communicated with the upper part of the water outlet tank;
and a PH value detector is arranged on a pipeline between the pipeline mixer and the raw water inlet of the gaseous film device, and the PH value detector, the control unit and the alkali liquor dosing pump are sequentially and electrically connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011513377.9A CN112551794A (en) | 2020-12-21 | 2020-12-21 | Method and system for treating high ammonia nitrogen in landfill leachate evaporation effluent |
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| CN202011513377.9A CN112551794A (en) | 2020-12-21 | 2020-12-21 | Method and system for treating high ammonia nitrogen in landfill leachate evaporation effluent |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102649616A (en) * | 2012-05-09 | 2012-08-29 | 天津凯铂能膜工程技术有限公司 | Comprehensive treatment method for garbage leachate |
| CN105366754A (en) * | 2015-11-13 | 2016-03-02 | 巨化集团技术中心 | Ammonia-nitrogen wastewater treatment device and method |
| CN106186492A (en) * | 2016-08-24 | 2016-12-07 | 国家海洋局天津海水淡化与综合利用研究所 | The ammonia nitrogen removal of a kind of embrane method high-concentration ammonia nitrogenous wastewater and ammonium salt enrichment method |
| CN109942043A (en) * | 2019-04-26 | 2019-06-28 | 中创水务科技环保(广东)有限公司 | A kind of percolate treating process and device |
| CN210764701U (en) * | 2019-07-16 | 2020-06-16 | 广西博世科环保科技股份有限公司 | Domestic waste leachate pretreatment device based on deamination membrane component |
| CN214528544U (en) * | 2020-12-21 | 2021-10-29 | 大连广泰源环保科技有限公司 | System for treating high ammonia nitrogen in landfill leachate evaporation effluent |
-
2020
- 2020-12-21 CN CN202011513377.9A patent/CN112551794A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649616A (en) * | 2012-05-09 | 2012-08-29 | 天津凯铂能膜工程技术有限公司 | Comprehensive treatment method for garbage leachate |
| CN105366754A (en) * | 2015-11-13 | 2016-03-02 | 巨化集团技术中心 | Ammonia-nitrogen wastewater treatment device and method |
| CN106186492A (en) * | 2016-08-24 | 2016-12-07 | 国家海洋局天津海水淡化与综合利用研究所 | The ammonia nitrogen removal of a kind of embrane method high-concentration ammonia nitrogenous wastewater and ammonium salt enrichment method |
| CN109942043A (en) * | 2019-04-26 | 2019-06-28 | 中创水务科技环保(广东)有限公司 | A kind of percolate treating process and device |
| CN210764701U (en) * | 2019-07-16 | 2020-06-16 | 广西博世科环保科技股份有限公司 | Domestic waste leachate pretreatment device based on deamination membrane component |
| CN214528544U (en) * | 2020-12-21 | 2021-10-29 | 大连广泰源环保科技有限公司 | System for treating high ammonia nitrogen in landfill leachate evaporation effluent |
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