CN112093957A - Treatment method of household garbage concentrated solution - Google Patents
Treatment method of household garbage concentrated solution Download PDFInfo
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- CN112093957A CN112093957A CN202010844808.3A CN202010844808A CN112093957A CN 112093957 A CN112093957 A CN 112093957A CN 202010844808 A CN202010844808 A CN 202010844808A CN 112093957 A CN112093957 A CN 112093957A
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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
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray 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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/722—Oxidation by peroxides
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
Abstract
The invention discloses a treatment method of a domestic garbage concentrated solution, which specifically comprises the following steps: (1) adding potassium permanganate into the domestic garbage concentrated solution for pretreatment, and standing for 10-16 h; (2) sequentially adding sodium hypochlorite for primary stirring, then adding chlorine dioxide for secondary stirring, and then adding hydrogen peroxide for tertiary stirring; (3) respectively adding a coagulant and a flocculant, standing for 6-10h, and passing through a disc tube type reverse osmosis membrane; (4) directly discharging the permeate, and sequentially carrying out vacuum concentration and spray drying on the trapped fluid to obtain solid powder for landfill. The invention can effectively remove organic matters and dissolved total solids (TDS) mainly containing inorganic salts in the domestic waste concentrated solution, so that the domestic waste concentrated solution treatment achieves the aim of zero emission; the method is simple and convenient to operate, economical, efficient, energy-saving, pollution-free, high in practicability and good in social benefit and economic benefit.
Description
Technical Field
The invention relates to the technical field of environmental protection engineering, in particular to a treatment method of a domestic garbage concentrated solution.
Background
With the increase of the number of cities and population in China, the urban domestic garbage also increases rapidly, and the situation of the garbage enclosed city is very severe. At present, the domestic garbage treatment mainly comprises landfill and incineration, but in the process of stacking and landfill, garbage percolate can be formed due to various metabolic substances and moisture generated by anaerobic fermentation, organic matter decomposition, rainwater leaching, underground water soaking and the like. Generally, leachate contains high-concentration organic matters and dissolved total solids (TDS) mainly containing inorganic salts, has dark black appearance, serious odor and high pollution degree, and has the disadvantages of complex water quality components, high pollutant concentration, poor biodegradability, difficult degradation, more toxic substances, high contents of bacteria, viruses and the like and high treatment difficulty.
At present, the commonly used treatment processes for the landfill leachate include a recharge method, a biochemical method, a physicochemical method and the like, and although the treatment processes have certain treatment effects, the landfill leachate still has certain defects, such as poor permeability and low load of the recharge method and great implementation difficulty; the biochemical method has poor treatment effect on low-biodegradability and difficult-degradation organic matters and high-toxicity leachate.
With the development of science and technology, a membrane separation method is widely applied to the treatment of landfill leachate, a membrane separation technology can efficiently intercept inorganic pollutants and organic pollutants in a dissolved state in sewage, the pollutants intercepted by a membrane form a membrane filtration concentrated solution, the content of organic matters and dissolved total solids (TDS) mainly containing inorganic salts in the concentrated solution is high and is generally 3-4 times of the concentration of the leachate, the treatment difficulty is high, the biodegradability is worse, and no mature and reliable treatment method exists at present, and the method is the biggest problem in the membrane separation treatment process.
Therefore, how to better treat the domestic waste concentrated solution is a problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides a method for treating a domestic waste concentrated solution, so as to solve the deficiencies in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment method of a domestic garbage concentrated solution specifically comprises the following steps:
(1) adding potassium permanganate into the domestic garbage concentrated solution for pretreatment, and standing for 10-16h to obtain a concentrated solution A;
(2) sequentially adding sodium hypochlorite into the concentrated solution to be treated for primary stirring, then adding chlorine dioxide for secondary stirring, and then adding hydrogen peroxide for tertiary stirring to obtain concentrated solution B;
(3) respectively adding a coagulant and a flocculant into the concentrated solution B, standing for 6-10h, and then passing through a disc tube type reverse osmosis membrane to respectively obtain a permeate and a retentate;
(4) directly discharging the permeate, and sequentially carrying out vacuum concentration and spray drying on the trapped fluid to obtain solid powder for landfill.
The method has the beneficial effects that the domestic garbage concentrated solution is pre-oxidized by potassium permanganate, and a certain amount of manganese dioxide is generated to be used as a catalyst to accelerate the oxidation reaction; then sodium hypochlorite, chlorine dioxide and hydrogen peroxide are sequentially added for multiple oxidation, so that organic matters in the domestic garbage concentrated solution can be fully decomposed; adding a coagulant and a flocculant for precipitation, so that a large amount of suspended matters in the domestic garbage concentrated solution can be removed; and finally, directly discharging the permeate obtained by the disc tube type reverse osmosis membrane, and sequentially carrying out vacuum concentration and spray drying on the retentate to obtain solid powder for landfill.
Further, in the step (1), the adding amount of the potassium permanganate is 6-10 g/L.
The further beneficial effects are that if the adding amount of the potassium permanganate is too small, the pre-oxidation can not be fully carried out; however, if the potassium permanganate is added in too much amount, the final drainage is mauve or pink, thereby causing secondary pollution. The addition amount of the potassium permanganate can simultaneously ensure the completeness of pre-oxidation and the basically unchanged chroma and pH value of the domestic garbage concentrated solution before and after treatment.
Further, in the step (2), the adding amount of sodium hypochlorite is 20-40g/L, the first stirring speed is 200-300r/min, and the time is 0.5-1.0 h; the adding amount of the chlorine dioxide is 20-30g/L, the speed of the second stirring is 100-200r/min, and the time is 1.0-2.0 h; the adding amount of the hydrogen peroxide is 40-60g/L, the third stirring speed is 200-300r/min, and the time is 0.5-1.0 h.
The method has the further beneficial effects that the sodium hypochlorite, the chlorine dioxide and the hydrogen peroxide have strong oxidizability and can generate free radicals of oxygen and chlorine in the oxidation reaction process, so that organic matters containing saturated and unsaturated bonds in the domestic garbage concentrated solution are decomposed to generate carbon dioxide and water or converted into organic matters which are easy to degrade, and toxic by-products are not generated.
Further, in the step (3), the coagulant is polymeric aluminum ferric chloride or polymeric ferric sulfate, and the adding amount is 20-40 g/L; the flocculating agent is polyacrylamide or polyacrylic acid, and the addition amount is 20-40 g/L.
The coagulant can accelerate the separation of solid and liquid, and then the floccule grows to a certain volume under the action of the flocculant to precipitate under the action of gravity, so that a large amount of suspended matters in the domestic garbage concentrated solution are removed, and the effects of reducing chromaticity, suspended matters (SS) and colloids are achieved.
Further, in the step (3), the diameter of the membrane column of the disc-tube reverse osmosis membrane is 200-300mm, the channel between the membranes is 4-6mm, and the flow of the membrane surface is 6-10 cm.
Adopt above-mentioned further beneficial effect to lie in, through dish tubular reverse osmosis membrane, can divide into purer permeate liquid and the trapped fluid that contains impurity with the concentrate, the later stage of being convenient for is handled respectively to have good stability, security and adaptability.
Further, in the step (4), the vacuum degree of vacuum concentration is (-0.01) - (-0.02) MPa, the temperature is 70-90 ℃, and the time is 20-30 min; the inlet temperature of spray drying is 180-220 ℃, the outlet temperature is 60-80 ℃, and the time is 20-40 s.
The method has the further beneficial effects that water vapor in the trapped liquid can be rapidly removed through vacuum concentration, then spray drying is carried out to obtain solid powder containing wastes, and finally the solid powder is packed and landfilled in a concentrated mode.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention can effectively remove organic matters and dissolved total solids (TDS) mainly containing inorganic salts in the domestic waste concentrated solution, can well make up the defects in the existing domestic waste concentrated solution treatment technology, and enables the domestic waste concentrated solution treatment to achieve the aim of zero emission;
2. the invention has the advantages of simple operation, economy, high efficiency, energy saving, no pollution, strong practicability and good social and economic benefits.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The treatment method of the domestic garbage concentrated solution specifically comprises the following steps:
(1) adding 6g/L potassium permanganate into the domestic garbage concentrated solution for pretreatment, and standing for 10h to obtain a concentrated solution A;
(2) sequentially adding 20g/L of sodium hypochlorite into the concentrated solution to be treated, stirring for 0.5h at the speed of 200r/min, then adding 20g/L of chlorine dioxide, stirring for 1.0h at the speed of 100r/min, then adding 40g/L of hydrogen peroxide, and stirring for 0.5h at the speed of 200r/min to obtain concentrated solution B;
(3) respectively adding 20g/L of polyaluminum ferric chloride and 20g/L of polyacrylic acid into the concentrated solution B, standing for 6h, and then passing through a disc-tube reverse osmosis membrane to respectively obtain a permeate and a retentate; wherein the diameter of a membrane column of the disc tube type reverse osmosis membrane is 200mm, the channel between membranes is 4mm, and the flow of the membrane surface is 6 cm;
(4) directly discharging the permeate, and sequentially carrying out vacuum concentration and spray drying on the trapped liquid to obtain solid powder for landfill; wherein the vacuum degree of vacuum concentration is-0.01 Pa, the temperature is 70 deg.C, and the time is 20 min; the inlet temperature of the spray drying is 180 ℃, the outlet temperature is 60 ℃ and the time is 20 s.
Example 2
The treatment method of the domestic garbage concentrated solution specifically comprises the following steps:
(1) adding 10g/L potassium permanganate into the domestic garbage concentrated solution for pretreatment, and standing for 16h to obtain a concentrated solution A;
(2) sequentially adding 40g/L of sodium hypochlorite into the concentrated solution to be treated, stirring for 1.0h at the speed of 300r/min, then adding 30g/L of chlorine dioxide, stirring for 2.0h at the speed of 200r/min, then adding 60g/L of hydrogen peroxide, and stirring for 1.0h at the speed of 300r/min to obtain concentrated solution B;
(3) respectively adding 40g/L polymeric ferric sulfate and 40g/L polyacrylamide into the concentrated solution B, standing for 10h, and then passing through a disc-tube reverse osmosis membrane to respectively obtain a permeate and a retentate; wherein the diameter of a membrane column of the disc tube type reverse osmosis membrane is 300mm, the channel between membranes is 6mm, and the flow of the membrane surface is 10 cm;
(4) directly discharging the permeate, and sequentially carrying out vacuum concentration and spray drying on the trapped liquid to obtain solid powder for landfill; wherein the vacuum degree of vacuum concentration is-0.02 MPa, the temperature is 90 ℃, and the time is 30 min; the inlet temperature of the spray drying was 220 ℃, the outlet temperature was 80 ℃ and the time was 40 s.
Example 3
The treatment method of the domestic garbage concentrated solution specifically comprises the following steps:
(1) adding 8g/L potassium permanganate into the domestic garbage concentrated solution for pretreatment, and standing for 12h to obtain a concentrated solution A;
(2) sequentially adding 30g/L of sodium hypochlorite into the concentrated solution to be treated, stirring at the speed of 250r/min for 1.0h, then adding 25g/L of chlorine dioxide, stirring at the speed of 150r/min for 2.0h, then adding 50g/L of hydrogen peroxide, and stirring at the speed of 250r/min for 0h to obtain concentrated solution B;
(3) respectively adding 30g/L of polyaluminum ferric chloride and 30g/L of polyacrylamide into the concentrated solution B, standing for 8h, and then passing through a disc tube type reverse osmosis membrane to respectively obtain a permeate and a retentate; wherein the diameter of a membrane column of the disc tube type reverse osmosis membrane is 250mm, the channel between membranes is 5mm, and the flow of the membrane surface is 8 cm;
(4) directly discharging the permeate, and sequentially carrying out vacuum concentration and spray drying on the trapped liquid to obtain solid powder for landfill; wherein the vacuum degree of vacuum concentration is-0.02 MPa, the temperature is 80 ℃, and the time is 25 min; the inlet temperature of the spray drying was 200 ℃, the outlet temperature was 70 ℃ and the time was 30 s.
Performance testing
The total phosphorus, total nitrogen, COD and TDS of the domestic waste concentrated solution stock solution and the treated permeate of each of the examples 1 to 3 were measured, and the removal rates were calculated, respectively, and the test results are shown in tables 1 to 3.
Table 1 example 1 total phosphorus, total nitrogen, COD and TDS and removal rates thereof
| Detecting items | Total phosphorus (mg/L) | Total nitrogen (mg/L) | COD(mg/L) | TDS(mg/L) |
| Stock solution | 2300 | 5600 | 6500 | 1870 |
| Permeate liquid | 18 | 25 | 18 | 35 |
| Removal Rate (%) | 99.22 | 99.55 | 99.72 | 98.13 |
Table 2 example 2 total phosphorus, total nitrogen, COD and TDS and removal rates thereof
| Detecting items | Total phosphorus (mg/L) | Total nitrogen (mg/L) | COD(mg/L) | TDS(mg/L) |
| Stock solution | 2300 | 5600 | 6500 | 1870 |
| Permeate liquid | 22 | 23 | 19 | 37 |
| Removal Rate (%) | 99.04 | 99.59 | 99.71 | 98.02 |
Table 3 example 3 total phosphorus, total nitrogen, COD and TDS and their removal rates
| Detecting items | Total phosphorus (mg/L) | Total nitrogen (mg/L) | COD(mg/L) | TDS(mg/L) |
| Stock solution | 2300 | 5600 | 6500 | 1870 |
| Permeate liquid | 16 | 18 | 15 | 28 |
| Removal Rate (%) | 99.30 | 99.69 | 99.77 | 98.50 |
As can be seen from tables 1-3, the total phosphorus, total nitrogen, COD and TDS treated by the method are all low, and the removal rate is up to more than 98%. Among them, example 3 is the most preferable example.
The tests prove that the invention can effectively remove organic matters and dissolved total solids (TDS) mainly containing inorganic salts in the domestic waste concentrated solution, can well make up the defects in the existing domestic waste concentrated solution treatment technology, and enables the domestic waste concentrated solution treatment to achieve the aim of zero emission.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A treatment method of a domestic garbage concentrated solution is characterized by comprising the following steps:
(1) adding potassium permanganate into the domestic garbage concentrated solution for pretreatment, and standing for 10-16h to obtain a concentrated solution A;
(2) sequentially adding sodium hypochlorite into the concentrated solution to be treated for primary stirring, then adding chlorine dioxide for secondary stirring, and then adding hydrogen peroxide for tertiary stirring to obtain concentrated solution B;
(3) respectively adding a coagulant and a flocculant into the concentrated solution B, standing for 6-10h, and then passing through a disc tube type reverse osmosis membrane to respectively obtain a permeate and a retentate;
(4) directly discharging the permeate, and sequentially carrying out vacuum concentration and spray drying on the trapped fluid to obtain solid powder for landfill.
2. The method for treating the domestic waste concentrated solution according to claim 1, wherein in the step (1), the addition amount of the potassium permanganate is 6-10 g/L.
3. The method for treating a concentrated solution of household garbage according to claim 1, wherein in the step (2), the amount of the sodium hypochlorite added is 20-40 g/L; the first stirring speed is 200-300r/min, and the time is 0.5-1.0 h.
4. The method for treating a concentrated solution of household garbage according to claim 3, wherein in the step (2), the amount of the added chlorine dioxide is 20-30 g/L; the second stirring speed is 100-200r/min, and the time is 1.0-2.0 h.
5. The method for treating a concentrated solution of household garbage according to claim 4, wherein in the step (2), the amount of the added hydrogen peroxide is 40-60 g/L; the third stirring speed is 200-300r/min, and the time is 0.5-1.0 h.
6. The method for treating a concentrated solution of household garbage according to claim 1, wherein in the step (3), the coagulant is polyaluminum ferric chloride or polyferric sulfate, and the addition amount is 20-40 g/L.
7. The method according to claim 6, wherein in the step (3), the flocculating agent is polyacrylamide or polyacrylic acid, and the addition amount is 20-40 g/L.
8. The method as claimed in claim 7, wherein in the step (3), the diameter of the membrane column of the disc-tube reverse osmosis membrane is 200-300mm, the channel between the membranes is 4-6mm, and the flow path on the membrane surface is 6-10 cm.
9. The method as claimed in claim 1, wherein in the step (4), the vacuum degree of the vacuum concentration is (-0.01) - (-0.02) MPa, the temperature is 70-90 ℃, and the time is 20-30 min.
10. The method as claimed in claim 9, wherein in the step (4), the inlet temperature of the spray drying is 180-220 ℃, the outlet temperature is 60-80 ℃, and the time is 20-40 s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112811646A (en) * | 2020-12-24 | 2021-05-18 | 山东华氟化工有限责任公司 | Method for treating wastewater with high fluorine ions, high COD (chemical oxygen demand) and high chroma |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264997A (en) * | 2008-04-17 | 2008-09-17 | 北京水气蓝德环保科技有限公司 | Method for processing film filtration concentrated solution of domestic refuse percolate treatment |
| CN102826682A (en) * | 2012-09-04 | 2012-12-19 | 北京化工大学 | Treatment method for concentrated solution obtained by filtering landfill leachate film |
| CN103570157A (en) * | 2013-10-25 | 2014-02-12 | 浙江博世华环保科技有限公司 | Method for processing percolate membrane treatment concentrated solution of refuse landfill |
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2020
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264997A (en) * | 2008-04-17 | 2008-09-17 | 北京水气蓝德环保科技有限公司 | Method for processing film filtration concentrated solution of domestic refuse percolate treatment |
| CN102826682A (en) * | 2012-09-04 | 2012-12-19 | 北京化工大学 | Treatment method for concentrated solution obtained by filtering landfill leachate film |
| CN103570157A (en) * | 2013-10-25 | 2014-02-12 | 浙江博世华环保科技有限公司 | Method for processing percolate membrane treatment concentrated solution of refuse landfill |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112811646A (en) * | 2020-12-24 | 2021-05-18 | 山东华氟化工有限责任公司 | Method for treating wastewater with high fluorine ions, high COD (chemical oxygen demand) and high chroma |
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