CN112978997A - Treatment method and treatment device for landfill leachate wastewater - Google Patents
Treatment method and treatment device for landfill leachate wastewater Download PDFInfo
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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Abstract
The invention relates to a landfill leachate wastewater treatment method and a treatment device, which comprises the following steps: adding acid into the leachate wastewater to be treated to adjust the pH value, uniformly mixing, standing, and filtering to remove insoluble substances; adding a catalyst into the leachate wastewater subjected to acid treatment to obtain pretreated leachate wastewater; introducing oxygen-containing gas into the pretreated leachate wastewater to perform oxidation reaction so as to remove organic pollutants in the leachate wastewater; recovering the catalyst in the obtained leachate wastewater, and performing denitrification treatment; the invention has the beneficial effects that: the method for treating the garbage leachate wastewater has the advantages of simple process, easy operation and control, high treatment efficiency and good effect, and the discharge index of the treated garbage leachate wastewater meets the requirements of GB 16889-.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method for treating garbage leachate wastewater.
Background
With the acceleration of the pace of urbanization construction in China, the population of cities is rapidly increased, and the quantity of municipal domestic waste is continuously increased. The household garbage landfill is an important municipal infrastructure for consuming the household garbage and is also an indispensable last ring on a chain for reducing, recycling and harmlessly treating the household garbage.
The landfill leachate waste water is liquid containing organic or inorganic components generated by physical, biological and chemical actions such as compaction, fermentation and the like in the stacking and landfill processes of the garbage and under the seepage action of precipitation and other external incoming water. Along with the increase of landfill age, the degradation rate of microorganisms to organic matters in garbage, the water holding capacity of the garbage and the permeability of water can be changed, most of the organic matters in percolate of middle and old aged landfill sites are long-chain carbohydrate or humus which are difficult to degrade, and percolate waste water generally has the characteristics of high pollutant content, high ammonia nitrogen content, high chromaticity, strong toxicity, long pollution time and the like, and is high-concentration organic waste water with complex components.
At present, the garbage percolate is treated by adopting a combined process of pretreatment, biochemical treatment and membrane advanced treatment in the industry. Wherein, the biochemical treatment generally adopts nitrification-denitrification + membrane biological reaction treatment to ensure the deamination effect. Because the activated sludge during denitrification is anaerobic heterotrophic bacteria and organic matters are required to be consumed in the denitrification process, enough organic carbon sources in the raw water need to be ensured. However, the landfill area is usually an integrally closed anaerobic environment, and as the landfill time increases, organic matters in the landfill leachate are converted into methane through anaerobic fermentation, so that part of landfill leachate treatment projects have the problem of serious imbalance of carbon-nitrogen ratio, and biochemical treatment is difficult.
Disclosure of Invention
The invention aims to provide the method for treating the waste water of the landfill leachate, which has the advantages of simple process flow, easy operation and control, high treatment efficiency and good treatment effect and can realize the standard discharge of the waste water of the landfill leachate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a landfill leachate wastewater treatment method comprises the following steps:
(1) adding acid into the leachate wastewater to be treated to adjust the pH value, uniformly mixing, standing, and filtering to remove insoluble substances;
(2) adding a catalyst into the leachate wastewater subjected to acid treatment to obtain pretreated leachate wastewater;
(3) introducing oxygen-containing gas into the pretreated leachate wastewater to perform oxidation reaction so as to remove organic pollutants in the leachate wastewater; the organic pollutants mainly comprise alkane, olefin, phenol, alcohol, lipid, ketone, aldehyde, aromatic hydrocarbon, heterocyclic substances and the like.
(4) And (4) recovering the catalyst in the leachate wastewater obtained in the step (3), and performing denitrification treatment.
As a preferred embodiment, in the step (1), the B/C ratio of the leachate wastewater is less than 0.1, the C/N ratio is 0.15-1.0, the COD of the leachate wastewater is 8000mg/L and the nitrogen content of the leachate wastewater is 5000mg/L and 3000 mg/L.
In the above method for treating landfill leachate wastewater, as a preferred embodiment, in step (1), the acid is hydrochloric acid or sulfuric acid, and the pH of the leachate wastewater is adjusted to 1-6 by adding acid.
In the above method for treating landfill leachate wastewater, as a preferred embodiment, in the step (1), the filtration is performed by using a microporous filter, and the microporous filter is a ceramic membrane filter with a pore size of 0.5-5 um.
As a preferred embodiment, in the step (2), the catalyst is at least one of hydrochloride of Cd, Co, Cu, Mn, Ni, Zn and Cr, and the addition amount of the catalyst in each liter of leachate wastewater is 0.01-0.2 mol.
As a preferred embodiment, in the step (2), the temperature of the oxidation reaction is 150-.
In the above method for treating landfill leachate wastewater, as a preferred embodiment, the oxygen content of the oxygen-containing gas is more than 20%, and the ratio of the volume flow rate of the oxygen-containing gas per unit time to the volume treatment capacity of the leachate wastewater per unit time in the oxidation reaction process is 10-30: 1.
as a preferred embodiment, in the step (4), the catalyst is recovered by chelating ion exchange resin. The method comprises the steps of adsorbing catalyst ions added in a pretreatment system by using an ion exchange principle, and then desorbing the adsorbed catalyst ions by using hydrochloric acid to obtain hydrochloride of the catalyst, so that the catalyst is recycled.
As a preferred embodiment, in the step (4), denitrification is performed by means of stripping. The total nitrogen removed is mainly the original ammonia nitrogen in the wastewater and the ammonia nitrogen oxidized by organic nitrogen.
In a second aspect of the present invention, there is provided a landfill leachate wastewater treatment apparatus, comprising:
a pH adjusting tank: used for adjusting the pH value of the percolate waste water to make the percolate waste water acidic;
a microporous filter: filtering the acidic leachate wastewater by a microporous filter to remove acid insoluble substances;
a catalyst dissolving tank: used for adding a catalyst into the leachate wastewater subjected to acid treatment to prepare pretreated leachate wastewater;
advanced oxidation system: used for completing the oxidation reaction of the pre-treated leachate wastewater;
a catalyst recovery system: recovering the catalyst in the leachate wastewater after the oxidation reaction;
a denitrification system: removing nitrogen in the leachate wastewater;
preferably, the microporous filter is a ceramic membrane filter with a pore size of 0.5-5 um;
more preferably, the catalyst recovery system is: chelating ion exchange resin;
further preferably, the denitrification system is: and (4) a stripping tower.
Compared with the prior art, the invention has the beneficial effects that:
the method for treating the garbage leachate wastewater has the advantages of simple process, easy operation and control, high treatment efficiency and good effect, and the discharge index of the treated garbage leachate wastewater meets the requirements of GB 16889-.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a landfill leachate wastewater treatment device, which comprises:
a pH adjusting tank: used for adjusting the pH value of the percolate waste water to make the percolate waste water acidic;
a microporous filter: filtering the acidic leachate wastewater by a microporous filter to remove acid insoluble substances;
a catalyst dissolving tank: used for adding a catalyst into the leachate wastewater subjected to acid treatment to prepare pretreated leachate wastewater;
advanced oxidation system: used for completing the oxidation reaction of the pre-treated leachate wastewater;
a catalyst recovery system: recovering the catalyst in the leachate wastewater after the oxidation reaction;
a denitrification system: and removing nitrogen in the leachate wastewater.
Example 1
A landfill leachate wastewater treatment method comprises the following steps:
(1) conveying the landfill leachate wastewater to be treated to a pH adjusting tank through a pipeline, wherein the B/C ratio and the C/N ratio of the landfill leachate wastewater to be treated are respectively 0.08 and 0.15, the COD of the landfill leachate wastewater is 2000mg/L, and the nitrogen content of the landfill leachate wastewater is 3000 mg/L;
adding hydrochloric acid to adjust pH to 1, mixing, standing, and filtering with microporous filter (ceramic membrane filter with pore diameter of 0.5 μm) to remove acid insoluble substance;
(2) conveying the acid-treated leachate wastewater to a catalyst dissolving tank through a pipeline, and adding a catalyst CoCl into the acid-treated leachate wastewater2The addition amount of the catalyst in each liter of percolate waste water is 001mol, obtaining the pretreated percolate wastewater;
(3) conveying the pretreated percolate wastewater to a high-level oxidation system through a pipeline, introducing oxygen-containing gas with oxygen content more than 20% into the pretreated percolate wastewater, wherein in the oxidation reaction process, the ratio of the volume flow of the oxygen-containing gas in unit time to the volume treatment capacity of the percolate wastewater in unit time is 10, and carrying out oxidation reaction for 1h under the conditions that the temperature of the oxidation reaction is 150 ℃ and the reaction pressure is 1MPa to remove organic pollutants in the percolate wastewater;
(4) and (3) conveying the leachate wastewater obtained in the step (3) to a catalyst recovery system through a pipeline, recovering the catalyst in the leachate wastewater by adopting a chelating ion exchange resin method, conveying the leachate wastewater after recovering the catalyst to a denitrification system through a pipeline, and performing denitrification treatment in a stripping mode to effectively remove the total nitrogen in the wastewater and meet the discharge requirement.
Example 2
A landfill leachate wastewater treatment method comprises the following steps:
(1) conveying the landfill leachate wastewater to be treated to a pH adjusting tank through a pipeline, wherein the B/C ratio and the C/N ratio of the landfill leachate wastewater to be treated are respectively 0.06 and 0.42, the COD of the landfill leachate wastewater to be treated is 5000mg/L, and the nitrogen content of the landfill leachate wastewater to be treated is 4000 mg/L;
adding sulfuric acid to adjust pH to 6, mixing, standing, and filtering with microporous filter (ceramic membrane filter with pore diameter of 2 μm) to remove acid insoluble substance;
(2) conveying the acid-treated leachate wastewater to a catalyst dissolving tank through a pipeline, and adding a catalyst CoCl into the acid-treated leachate wastewater2Adding 0.1mol of catalyst in each liter of percolate wastewater to obtain pretreated percolate wastewater;
(3) conveying the pretreated percolate wastewater to a high-level oxidation system through a pipeline, introducing oxygen-containing gas with the oxygen content being more than 20% into the pretreated percolate wastewater, wherein in the oxidation reaction process, the ratio of the volume flow of the oxygen-containing gas in unit time to the volume treatment capacity of the percolate wastewater in unit time is 20, and carrying out oxidation reaction for 2 hours under the conditions that the temperature of the oxidation reaction is 200 ℃ and the reaction pressure is 5MPa to remove organic pollutants in the percolate wastewater;
(4) and (3) conveying the leachate wastewater obtained in the step (3) to a catalyst recovery system through a pipeline, recovering the catalyst in the leachate wastewater by adopting a chelating ion exchange resin method, conveying the leachate wastewater after recovering the catalyst to a denitrification system through a pipeline, and performing denitrification treatment in a stripping mode to effectively remove the total nitrogen in the wastewater and meet the discharge requirement.
Example 3
A landfill leachate wastewater treatment method comprises the following steps:
(1) conveying the landfill leachate wastewater to be treated to a pH adjusting tank through a pipeline, wherein the B/C ratio and the C/N ratio of the landfill leachate wastewater to be treated are respectively 0.05 and 0.5, the COD of the landfill leachate wastewater is 8000mg/L, and the nitrogen content of the landfill leachate wastewater is 5000 mg/L;
adding hydrochloric acid to adjust pH to 3, mixing, standing, and filtering with microporous filter (ceramic membrane filter with pore diameter of 5 μm) to remove acid insoluble substance;
(2) conveying the acid-treated leachate wastewater to a catalyst dissolving tank through a pipeline, and adding a catalyst CoCl into the acid-treated leachate wastewater2Adding 0.2mol of catalyst into each liter of percolate wastewater to obtain pretreated percolate wastewater;
(3) conveying the pretreated percolate wastewater to a high-level oxidation system through a pipeline, introducing oxygen-containing gas with oxygen content more than 20% into the pretreated percolate wastewater, wherein in the oxidation reaction process, the ratio of the volume flow of the oxygen-containing gas in unit time to the volume treatment capacity of the percolate wastewater in unit time is 30, and carrying out oxidation reaction for 3h under the conditions that the temperature of the oxidation reaction is 250 ℃ and the reaction pressure is 10MPa to remove organic pollutants in the percolate wastewater;
(4) and (3) conveying the leachate wastewater obtained in the step (3) to a catalyst recovery system through a pipeline, recovering the leachate wastewater by using a chelating ion exchange resin method to obtain a catalyst, conveying the leachate wastewater after recovering the catalyst to a denitrification system through a pipeline, and performing denitrification treatment in a stripping mode to effectively remove total nitrogen in the wastewater so as to meet the requirement of discharge.
Comparative example 1
The landfill leachate treatment method described in comparative example 1 is different from that of example 1 in that: the landfill leachate treatment method described in comparative example 1 adds acid to adjust the pH of leachate wastewater to 7, and the rest of the operation steps are the same as those in example 1.
Comparative example 2
The landfill leachate treatment method described in comparative example 2 is different from that of example 2 in that: the temperature of the oxidation reaction of the landfill leachate treatment method of the comparative example 2 is 100 ℃, and the rest of the operation steps are the same as those of the example 2.
Comparative example 3
The landfill leachate treatment method described in comparative example 3 is different from that of example 3 in that: the landfill leachate treatment method described in comparative example 3 has the ratio of the volume flow rate per unit time of the introduced oxygen-containing gas to the volume treatment capacity per unit time of leachate wastewater of 5, and the rest of the operation steps are the same as those in example 3.
The effect research of the landfill leachate treatment methods of the embodiments 1 to 3 and the comparative examples 1 to 3 of the invention comprises the following steps:
TABLE 1 Effect of the landfill leachate treatment method of the present invention
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for treating landfill leachate wastewater is characterized by comprising the following steps:
(1) adding acid into the leachate wastewater to be treated to adjust the pH value, uniformly mixing, standing, and filtering to remove insoluble substances;
(2) adding a catalyst into the leachate wastewater subjected to acid treatment to obtain pretreated leachate wastewater;
(3) introducing oxygen-containing gas into the pretreated leachate wastewater to perform oxidation reaction so as to remove organic pollutants in the leachate wastewater;
(4) and (4) recovering the catalyst in the leachate wastewater obtained in the step (3), and performing denitrification treatment.
2. The method for treating landfill leachate waste water of claim 1, wherein in step (1), the B/C ratio of the leachate waste water is less than 0.1, the C/N ratio is 0.15-1.0, the COD of the leachate waste water is 8000mg/L and the nitrogen content of the leachate waste water is 3000mg/L and 5000 mg/L.
3. The method for treating landfill leachate waste water of claim 1, wherein in step (1), the acid is hydrochloric acid or sulfuric acid, and the pH of the leachate waste water is adjusted to 1-6 by adding acid.
4. The method for treating landfill leachate wastewater according to claim 1, wherein in the step (1), the filtration is performed by using a microporous filter, and the microporous filter is a ceramic membrane filter with a pore size of 0.5-5 um.
5. The landfill leachate waste water treatment method of claim 1, wherein in the step (2), the catalyst is at least one of hydrochloride of Cd, Co, Cu, Mn, Ni, Zn and Cr, and the addition amount of the catalyst is 0.01-0.2mol per liter of leachate waste water.
6. The method for treating landfill leachate wastewater as recited in claim 1, wherein in the step (2), the temperature of the oxidation reaction is 150-.
7. The method for treating landfill leachate wastewater of claim 1, wherein the oxygen content of the oxygen-containing gas is greater than 20%, and the ratio of the volumetric flow rate of the oxygen-containing gas per unit time to the volumetric treatment capacity of the leachate wastewater per unit time during the oxidation reaction is 10-30: 1.
8. the landfill leachate waste water treatment method of claim 1, wherein in the step (4), the catalyst is recovered by chelating ion exchange resin.
9. The landfill leachate waste water treatment method of claim 1, wherein in the step (4), the denitrification is performed by means of stripping.
10. The utility model provides a landfill leachate effluent treatment plant which characterized in that includes:
a pH adjusting tank: used for adjusting the pH value of the percolate waste water to make the percolate waste water acidic;
a microporous filter: filtering the acidic leachate wastewater by a microporous filter to remove acid insoluble substances;
a catalyst dissolving tank: used for adding a catalyst into the leachate wastewater subjected to acid treatment to prepare pretreated leachate wastewater;
advanced oxidation system: used for completing the oxidation reaction of the pre-treated leachate wastewater;
a catalyst recovery system: recovering the catalyst in the leachate wastewater after the oxidation reaction;
a denitrification system: and removing nitrogen in the leachate wastewater.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291931A (en) * | 2021-12-31 | 2022-04-08 | 东江环保股份有限公司 | Resource treatment method for landfill leachate |
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Application publication date: 20210618 |