CN111410339A - Method for pretreating kitchen waste leachate based on molecular oxygen activation and enhanced flocculation - Google Patents
Method for pretreating kitchen waste leachate based on molecular oxygen activation and enhanced flocculation Download PDFInfo
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- CN111410339A CN111410339A CN202010293657.7A CN202010293657A CN111410339A CN 111410339 A CN111410339 A CN 111410339A CN 202010293657 A CN202010293657 A CN 202010293657A CN 111410339 A CN111410339 A CN 111410339A
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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
- C02F1/52—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
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/30—Organic compounds
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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 relates to a method for pretreating kitchen waste leachate based on molecular oxygen activation and enhanced flocculation. The method comprises the following steps: adding the mixed solution of ferrous salt and small molecular acid into the percolate, aerating for a period of time, adding flocculating agent polyaluminium chloride and coagulant aid polyacrylamide for flocculation, standing and then carrying out solid-liquid separation. The invention can greatly improve the removal effect of suspended particulate matters and reduce COD.
Description
Technical Field
The invention belongs to the field of landfill leachate treatment, and particularly relates to a method for pretreating kitchen garbage leachate based on molecular oxygen activation and enhanced flocculation.
Background
The kitchen waste leachate is generated after anaerobic fermentation process treatment in the kitchen waste treatment process, the kitchen waste leachate contains a large amount of grease, colloidal particles and suspended matters, the COD content of the kitchen waste leachate reaches 14000-20000 mg/L, the ammonia nitrogen concentration reaches 2500-3000 mg/L, and the suspended matter concentration is more than 2000 mg/L, so that the subsequent biochemical treatment difficulty is large, particularly, the leachate contains a large amount of animal and vegetable oil and high-concentration suspended matters, the growth of microorganisms can be seriously inhibited, and the biochemical treatment process is more difficult.
At present, the treatment process of the kitchen waste leachate is mainly a two-stage A/O + external MBR process. However, the traditional A/O process has the disadvantages of high oxygenation energy consumption, low volumetric denitrification efficiency, large occupied area, high treatment cost and unsatisfactory effect of treating high-oil and high-suspended substance kitchen waste leachate. In order to solve the problem of high oil content and high suspended matter content of the kitchen waste leachate, a multistage pretreatment process is provided in a patent (kitchen waste leachate enhanced treatment method and system, application number: 201810957144.4). However, the multi-stage pretreatment process is complicated and relatively high in cost. Therefore, research and development of the efficient pretreatment process technology for the kitchen waste leachate is a key for solving the problem of the kitchen waste leachate.
Disclosure of Invention
The invention aims to provide a method for pretreating kitchen waste leachate based on molecular oxygen activation and enhanced flocculation, which can overcome the defect that the existing flocculation precipitation method cannot efficiently treat suspended particles in the leachate based on a new molecular oxygen activation technology, enhance the removal of the suspended particle precipitates, and improve the effect and the operation difficulty of treating the leachate by the molecular oxygen activation pretreatment and flocculation integration technology.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the method for pretreating the kitchen waste leachate based on molecular oxygen activation and reinforced flocculation comprises the steps of adding a mixed solution of ferrous salt and small molecular acid into the leachate, aerating for a period of time, adding flocculating agent polyaluminium chloride and coagulant aid polyacrylamide for flocculation, standing, and then carrying out solid-liquid separation.
According to the scheme, the method mainly comprises the following steps: 1) adding a mixed solution of ferrite and a small molecular acid into the percolate, and carrying out aeration reaction for a period of time until the color of the solution begins to turn yellow, and then continuing aeration for a period of time; 2) then adding a flocculating agent polyaluminium chloride solution, and stirring for a certain time; 3) and finally adding a coagulant aid polyacrylamide solution, stirring for a period of time, and standing for solid-liquid separation.
According to the scheme, the concentration of suspended particles in the percolate is more than 2000 mg/L and more than 14000 mg/L.
According to the scheme, the selected ferrous salt comprises ferrous sulfate, ferrous nitrate, ferrous chloride and other ferric salts containing ferrous ions, the adding concentration of the ferrous salt is 2-6 g/L, a certain ferrous salt dosage can achieve a better molecular oxygen activation effect, meanwhile, the rear end flocculation precipitation is not influenced, excessive ferric ions can form a complex with part of insoluble organic matters, and the flocculation effect is influenced.
According to the scheme, the small molecular acid comprises oxalic acid, tea polyphenol, tartaric acid and the like, and the mass ratio of the small molecular acid to the ferrous salt is 0.001-0.01: 1.
According to the scheme, the aeration process can utilize conventional micron aeration equipment or nano aeration equipment, and the aeration time is continued for 30-150 min after the solution turns yellow.
According to the scheme, the mass ratio of the polyaluminium chloride to the suspended particles is 0.2-0.6: 1.
According to the scheme, the stirring speed after adding the polyaluminium chloride is 100-130 r/min, and the stirring time is 2-4 min.
According to the scheme, the mass ratio of the polyacrylamide to the suspended particles is 0.002-0.01: 1; the polyacrylamide comprises cationic polyacrylamide and anionic polyacrylamide.
According to the scheme, after the polyacrylamide is added, the mixture is slowly stirred for 2-5min and then is quickly stirred for 3-6 min. The slow stirring speed is 100-.
According to the scheme, the stirring time for adding the polyacrylamide in the step (3) is 3-8 min.
The method comprises the steps of firstly adding a mixed solution of ferrous salt and small molecular acid, then starting aeration, effectively utilizing the advantages of a molecular oxygen activation technology, generating intermediate substances with strong oxidation and reduction capabilities in a molecular oxygen activation mode, and removing organic pollutants in the percolate.
The invention has the beneficial effects that:
the invention provides a molecular oxygen reinforced flocculation technology, which comprises the steps of adding a mixed solution of micromolecular acid and ferrous salt into percolate, aerating for a period of time to remove organic pollutants in the percolate, changing the charge distribution on the surface of suspended particles, and finally removing the suspended particles by flocculation of polyaluminium chloride and polyacrylamide. The invention can use the molecular oxygen activation process to destroy the structure of suspended particles which are difficult to be removed by the conventional flocculation process, reduce the COD of the leachate, improve the removal effect of the suspended particles, effectively overcome the problem that the conventional flocculation process can not treat the leachate with high suspended particle concentration, realize the extremely rapid reduction of the suspended particle concentration in the leachate and obtain the polluted water suitable for the biochemical treatment of the next stage.
Description of the drawings:
FIG. 1 shows the leachate after flocculation treatment in example 1, wherein a is not subjected to aeration pretreatment, and b is subjected to aeration pretreatment after ferrous sulfate and oxalic acid are added.
Detailed Description
Example 1
Adding 4 g/L ferrous sulfate and 40 mg/L oxalic acid into 500m L percolate with the suspended particulate matter concentration of 3500 mg/L and the COD value of 19700, carrying out aeration reaction for a period of time until the color of the solution begins to turn yellow, continuing aeration for 150min, adding 1400 mg/L of polyaluminium chloride, stirring for 3min, adding 27 mg/L of anionic polyacrylamide, slowly stirring for 2min, then rapidly stirring for 3min, and after the enhanced flocculation treatment, reducing the concentration of the suspended particulate matter in the percolate to 980 mg/L to 13700.
In contrast, in the leachate after the flocculation treatment (the flocculation treatment conditions are as above) by directly adding polyaluminium chloride and polyacrylamide without adding ferrous sulfate and oxalic acid and without aeration treatment, the concentration of suspended particulate matters is 2860 mg/L and is 16870, as shown in fig. 1(a), the leachate without pretreatment is still almost the same as the original leachate, and the water body is opaque.
Example 2
Adding 2 g/L ferrous sulfate and 2 mg/L oxalic acid into 500m L percolate with the suspended particulate matter concentration of 2800 mg/L and the COD value of 14530, carrying out aeration reaction for a period of time until the color of the solution begins to turn yellow, continuing aeration for 120min, adding 560 mg/L of polyaluminium chloride, stirring for 2min, adding 5.6 mg/L of anionic polyacrylamide, slowly stirring for 2min, then rapidly stirring for 3min, and after the enhanced flocculation treatment, reducing the concentration of the suspended particulate matter in the percolate to 2343 mg/L to 13790.
Example 3
Adding 6 g/L ferrous sulfate and 60 mg/L tartaric acid into 500m L percolate with the suspended particulate matter concentration of 3200 mg/L and the COD value of 18270, carrying out aeration reaction for a period of time until the color of the solution begins to turn yellow, continuing aeration for 120min, adding 1920 mg/L of polyaluminium chloride, stirring for 4min, adding 32 mg/L of anionic polyacrylamide, slowly stirring for 2min, then rapidly stirring for 3min, and after the enhanced flocculation treatment, reducing the concentration of the suspended particulate matter in the percolate to 875 mg/L to 9640.
Example 4
Adding 4 g/L of ferrous sulfate and 40 mg/L of tea polyphenol into 500m L percolate with the suspended particulate matter concentration of 3100 mg/L and the COD value of 18460, carrying out aeration reaction for a period of time until the color of the solution begins to turn yellow, continuing aeration for 120min, adding 1920 mg/L of polyaluminium chloride, stirring for 4min, adding 32 mg/L of anionic polyacrylamide, slowly stirring for 2min, then rapidly stirring for 3min, and after the enhanced flocculation treatment, reducing the concentration of the suspended particulate matter in the percolate to 1430 mg/L which is 11200.
Example 5
Adding 4 g/L of ferrous sulfate, 40 mg/L of oxalic acid and tartaric acid into 500m L percolate with the suspended particulate matter concentration of 3300 mg/L and the COD value of 17260, mixing, carrying out aeration reaction for a period of time until the color of the solution begins to turn yellow, continuing aeration for 120min, adding 1920 mg/L of polyaluminium chloride, stirring for 4min, adding 32 mg/L of anionic polyacrylamide, slowly stirring for 2min, then rapidly stirring for 3min, and after the enhanced flocculation treatment, reducing the concentration of the suspended particulate matter in the percolate to 850 mg/L to 9260.
Claims (10)
1. A method for pretreating kitchen waste leachate based on molecular oxygen activation and enhanced flocculation is characterized by comprising the following steps: adding the mixed solution of ferrous salt and small molecular acid into the percolate, aerating for a period of time, adding flocculating agent polyaluminium chloride and coagulant aid polyacrylamide for flocculation, standing and then carrying out solid-liquid separation.
2. The method of claim 1, wherein: the method mainly comprises the following steps: 1) adding a mixed solution of ferrite and a small molecular acid into the percolate, and carrying out aeration reaction for a period of time until the color of the solution begins to turn yellow, and then continuing aeration for a period of time; 2) then adding a flocculating agent polyaluminium chloride solution, and stirring for a certain time; 3) and finally adding a coagulant aid polyacrylamide solution, stirring for a period of time, and standing for solid-liquid separation.
3. The method of claim 1 or 2, wherein the concentration of suspended particles in the leachate is greater than 2000 mg/L and greater than 14000 mg/L.
4. The method according to claim 1 or 2, wherein the selected ferrous salts include ferrous sulfate, ferrous nitrate and ferrous chloride, and the addition concentration of the ferrous salts is 2-6 g/L.
5. The method according to claim 1 or 2, characterized in that: the small molecular acid comprises oxalic acid, tea polyphenol and tartaric acid, and the mass ratio of the small molecular acid to ferrous salt is 0.001-0.01: 1.
6. The method of claim 2, wherein: and (3) aerating by using conventional micron aeration equipment or nano aeration equipment in the aeration process of the step 1), wherein the aeration time is 30-150 min after the solution turns yellow.
7. The method according to claim 1 or 2, characterized in that: the mass ratio of the polyaluminium chloride to the suspended particles is 0.2-0.6: 1; the mass ratio of the polyacrylamide to the suspended particles is 0.002-0.01: 1.
8. The method according to claim 1 or 2, characterized in that: the stirring speed after adding the polyaluminium chloride is 100-130 r/min, and the stirring time is 2-4 min.
9. The method according to claim 1 or 2, characterized in that: stirring for 3-8min after adding polyacrylamide; the polyacrylamide comprises cationic polyacrylamide and anionic polyacrylamide.
10. The method according to claim 1 or 2, characterized in that: after adding polyacrylamide, slowly stirring for 2-5min, then quickly stirring for 3-6min, wherein the slow stirring speed is 100-.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111939866A (en) * | 2020-09-04 | 2020-11-17 | 常熟理工学院 | Method for efficiently treating domestic garbage leachate and preparing modified aluminum-iron-based adsorbent |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111939866A (en) * | 2020-09-04 | 2020-11-17 | 常熟理工学院 | Method for efficiently treating domestic garbage leachate and preparing modified aluminum-iron-based adsorbent |
| CN111939866B (en) * | 2020-09-04 | 2022-11-25 | 常熟理工学院 | Method for efficiently treating household garbage leachate and preparing modified aluminum-iron-based adsorbent |
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Application publication date: 20200714 |