CN113087220A - Method for separating macromolecular organic pollutants in percolate concentrated solution by combined flocculation - Google Patents
Method for separating macromolecular organic pollutants in percolate concentrated solution by combined flocculation Download PDFInfo
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- CN113087220A CN113087220A CN202110457035.8A CN202110457035A CN113087220A CN 113087220 A CN113087220 A CN 113087220A CN 202110457035 A CN202110457035 A CN 202110457035A CN 113087220 A CN113087220 A CN 113087220A
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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
- C02F1/545—Silicon 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
- C02F1/66—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
- 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 separating macromolecular organic pollutants in percolate concentrated solution by combined flocculation, which comprises the following steps: 1) adjusting pH of the percolate concentrate to 3.5-4.5, and adding composite organic flocculant; 2) standing for 12-24h, and separating to obtain a suspension; 3) adjusting the pH value of the suspension to 3.5-4.5, and then adding an inorganic flocculant; 4) and stirring and standing, and separating out precipitate, wherein the precipitate is the macromolecular organic pollutant after flocculation separation. Compared with the prior art, the method has the advantages that aiming at the characteristics of high content of macromolecular organic pollutants in the leachate concentrated solution, high chromaticity, difficult removal, special chemical properties and the like, the macromolecular organic pollutants in the leachate concentrated solution are separated by adopting a multi-stage combined flocculation method, the chromaticity of the concentrated solution can be efficiently reduced, the method has a remarkable removal effect on colored groups in the concentrated solution, and the method is simple in process, low in cost and high in economic and social environmental benefits.
Description
Technical Field
The invention belongs to the technical field of high-concentration organic wastewater treatment, and relates to a method for separating macromolecular organic pollutants in percolate concentrated solution by multi-stage combined flocculation.
Background
The domestic garbage leachate is secondary pollution generated after urban domestic garbage is buried in a sanitary way, has the characteristics of various pollutants, large water quantity, large water quality fluctuation and no periodic change, directly or indirectly pollutes water under the actions of atmosphere, precipitation, garbage self degradation and the like, and greatly influences the utilization of people on natural water. In order to protect the natural environment and practically ensure the normal production and life of people, the effective treatment of the landfill leachate is an important task.
The landfill leachate treatment technology mainly comprises a biological treatment technology and a physical and chemical treatment technology. Leachate can be classified into fresh leachate and aged leachate according to the age and humification degree of the landfill. Because the biological treatment depends on the metabolism of microorganisms to remove organic matters in the percolate, the biological treatment is mainly suitable for the fresh percolate with good biodegradability and has the advantages of good treatment effect and low cost. And the physicochemical treatment is simpler and more efficient, is suitable for percolate difficult to be biodegraded and is commonly used in the pretreatment and advanced treatment processes. However, in the conventional percolate treatment process, the concentrated solution is finally caused by the membrane process.
The concentrated solution generated by the landfill leachate contains a lot of macromolecular substances which are difficult to degrade, and the characteristics of high content of harmful substances, high content of humic acid, high viscosity and the like become main problems for preventing the harmless treatment of the landfill leachate. The concentrated solution is dark black, alkaline, high in nitrogen and phosphorus content and high in carbon-nitrogen ratio, and is high in concentration organic waste liquid, wherein metal elements and inorganic anions are K+、Na+、Cl-、SO4 2-The ions are the main, and the organic matter is sodium humate.
Percolate concentrate is generally refilled into a landfill, but after long-term refilling, the pressure on subsequent membrane treatment is higher and higher, and the cost is higher and higher. What is more important is that the treatment mode does not fundamentally remove pollutants such as COD (chemical oxygen demand) and the like, but only concentrates the pollutants, so that the actual requirements cannot be met.
Disclosure of Invention
The invention aims to provide a method for separating macromolecular organic pollutants in a combined flocculation leachate concentrated solution, which can realize the separation and removal of the macromolecular organic pollutants in the landfill leachate concentrated solution. On the basis of flocculation reaction, the invention effectively separates the substances in the concentrated solution of the percolate and reduces the COD value to a certain extent, so that the treated solution can be further applied to production and life.
The purpose of the invention can be realized by the following technical scheme:
a method for combined flocculation separation of macromolecular organic contaminants in a concentrate of a diafiltration fluid, which method comprises the steps of:
1) adjusting pH of the percolate concentrate to 3.5-4.5, and adding composite organic flocculant;
2) standing for 12-24h, and separating to obtain a suspension;
3) adjusting the pH value of the suspension to 3.5-4.5, and then adding an inorganic flocculant;
4) and stirring and standing, and separating out precipitate, wherein the precipitate is the macromolecular organic pollutant after flocculation separation.
Preferably, the flocculation process is carried out in a reaction device, including a beaker, an electric stirrer and the like, to finally complete the flocculation precipitation separation.
Further, in the step 1), the concentrated leachate is a nanofiltration concentrated solution generated in the process of treating the domestic garbage leachate.
Further, in step 1) and step 3), the pH value is adjusted by using a sulfuric acid solution.
Further, the concentration of the sulfuric acid solution is 0.2-1.4 mol/L.
Further, in the step 1), the composite organic flocculant comprises N-aminoethyl-gamma-aminopropyltrimethoxysilane and (3-mercaptopropyl) trimethoxysilane. N-aminoethyl-gamma-aminopropyl trimethoxy silane and (3-mercaptopropyl) trimethoxy silane both contain siloxane bonds and are easy to generate grafting reaction with macromolecular organic matters, so that macromolecular substances in concentrated solution are settled.
Further, the mass concentration of the composite organic flocculant in a concentrated percolate solution is 3-4mg/L, and the volume ratio of the N-aminoethyl-gamma-aminopropyltrimethoxysilane to the (3-mercaptopropyl) trimethoxysilane is 6 (4-9).
Preferably, in step 2), standing at normal temperature, and after precipitation occurs, separating the suspension from the precipitate.
Further, in the step 3), the inorganic flocculant is polyaluminium chloride. Compared with other inorganic flocculating agents (such as polyferric chloride), the polyaluminum chloride has a better treatment effect on reducing the chromaticity, is a common flocculating agent, is convenient to use and easy to obtain, and is easy to remove after being added.
Preferably, the flocculant is purchased from Shanghai Aladdin Biotechnology Ltd, and is analytically pure.
Further, the mass concentration of the polyaluminium chloride in the suspension is 500-800 mg/L.
Further, in the step 4), the stirring process is as follows: quickly stirring for 2.5-3.5min, and slowly stirring for 1.5-2.5 min. The mixing process of the coagulant is to fully and uniformly mix the coagulant with raw water, and the turbulent motion of water flow is required to be violent and fast to finish, so the stirring of the polyaluminium chloride should be fast and slow. The rotating speed and the stirring time of the stirrer are set according to technological parameters, the stirrer is generally set to be quickly stirred for about 3min, and then the stirring water flow speed is required to be gradually reduced along with the growth of the flocculating constituent in the process of forming the flocculating constituent so as to prevent the formed flocculating constituent from being broken.
Further, in the process of rapid stirring, the rotating speed is 200-400 r/min; in the process of slow stirring, the rotating speed is 100-.
In the invention, organic flocculation separation is firstly utilized to settle macromolecular substances in the concentrated solution through hydrolysis, so that part of the macromolecular substances are settled, and part of the chroma is reduced, and then inorganic flocculation is used to continue settling the macromolecular substances in the concentrated solution and the added organic medicament, so that the chroma of the solution is further reduced.
Compared with the prior art, the method has the advantages that aiming at the characteristics of high content of macromolecular organic pollutants in the leachate concentrated solution, high chromaticity, difficult removal, special chemical properties and the like, the macromolecular organic pollutants in the leachate concentrated solution are separated by adopting a multi-stage combined flocculation method, the chromaticity of the concentrated solution can be efficiently reduced, the method has a remarkable removal effect on colored groups in the concentrated solution, and the method is simple in process, low in cost and high in economic and social environmental benefits.
Drawings
FIG. 1 is a flow diagram of a process for the separation of macromolecular organic contaminants in a concentrate of a diafiltration fluid by combined flocculation in accordance with the present invention;
FIG. 2 is a graph showing the change in color of the percolate concentrate of refuse in example 1 before and after the multi-stage combined flocculation separation.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
a method for multi-stage combined flocculation separation of macromolecular organic pollutants in percolate concentrate is shown in figure 1 and comprises the following steps:
(1) putting the landfill leachate concentrated solution into a reaction container, and adjusting the pH value to 4 by using 0.5mol/L sulfuric acid solution;
(2) adding two organic flocculation separating agents of N-aminoethyl-gamma-aminopropyltrimethoxysilane and (3-mercaptopropyl) trimethoxysilane according to the volume ratio of 4:6 at normal temperature;
(3) standing for 18h, separating the suspension from the precipitate after the precipitate appears, and adjusting the pH value to be 4 by using 1.1mol/L sulfuric acid solution.
(4) And adding polyaluminium chloride serving as a flocculating agent into the suspension, quickly stirring for 3min at 300r/min, then slowly stirring for 2min at 125r/min, standing after the reaction is finished, and obtaining a precipitate which is the macromolecular organic pollutant after flocculation separation.
The change in colour in the concentrate of the diafiltrate before and after treatment was compared as shown in figure 2. As can be seen from FIG. 2, the color of the concentrate was reduced from 500 to 20 after treatment, resulting in a total removal efficiency of about 96%.
Example 2:
a method for combined flocculation separation of macromolecular organic contaminants in a concentrate of a diafiltration fluid comprising the steps of:
1) adjusting the pH value of the percolate concentrated solution to 3.5, and then adding a composite organic flocculant;
2) standing for 24h, and separating to obtain a suspension;
3) adjusting the pH value of the suspension to 3.5, and then adding an inorganic flocculant;
4) and stirring and standing, and separating out precipitate, wherein the precipitate is the macromolecular organic pollutant after flocculation separation.
In the step 1), the concentrated leachate is a nanofiltration concentrated solution generated in the process of treating the domestic garbage leachate.
In the step 1), the composite organic flocculant comprises N-aminoethyl-gamma-aminopropyltrimethoxysilane and (3-mercaptopropyl) trimethoxysilane. The mass concentration of the composite organic flocculant in the percolate concentrated solution is 4mg/L, and the volume ratio of N-aminoethyl-gamma-aminopropyltrimethoxysilane to (3-mercaptopropyl) trimethoxysilane is 3: 2.
In the step 3), the inorganic flocculant is polyaluminium chloride. The mass concentration of the polyaluminium chloride in the suspension is 800 mg/L.
In the step 1) and the step 3), the pH value is adjusted by using a sulfuric acid solution. The concentration of the sulfuric acid solution was 0.2 mol/L.
In the step 4), the stirring process is as follows: quickly stirring for 3.5min, and slowly stirring for 1.5 min. In the process of rapid stirring, the rotating speed is 400 r/min; in the process of slow stirring, the rotating speed is 150 r/min.
Example 3:
a method for combined flocculation separation of macromolecular organic contaminants in a concentrate of a diafiltration fluid comprising the steps of:
1) adjusting the pH value of the percolate concentrated solution to 4.5, and then adding a composite organic flocculant;
2) standing for 12h, and separating to obtain a suspension;
3) adjusting the pH value of the suspension to 4.5, and then adding an inorganic flocculant;
4) and stirring and standing, and separating out precipitate, wherein the precipitate is the macromolecular organic pollutant after flocculation separation.
In the step 1), the concentrated leachate is a nanofiltration concentrated solution generated in the process of treating the domestic garbage leachate.
In the step 1), the composite organic flocculant comprises N-aminoethyl-gamma-aminopropyltrimethoxysilane and (3-mercaptopropyl) trimethoxysilane. The mass concentration of the composite organic flocculant in the percolate concentrated solution is 3mg/L, and the volume ratio of the N-aminoethyl-gamma-aminopropyltrimethoxysilane to the (3-mercaptopropyl) trimethoxysilane is 2: 3.
In the step 3), the inorganic flocculant is polyaluminium chloride. The mass concentration of the polyaluminium chloride in the suspension is 500 mg/L.
In the step 1) and the step 3), the pH value is adjusted by using a sulfuric acid solution. The concentration of the sulfuric acid solution was 1.4 mol/L.
In the step 4), the stirring process is as follows: quickly stirring for 2.5min, and slowly stirring for 2.5 min. In the process of rapid stirring, the rotating speed is 200 r/min; in the process of slow stirring, the rotating speed is 100 r/min.
Example 4:
a method for combined flocculation separation of macromolecular organic contaminants in a concentrate of a diafiltration fluid comprising the steps of:
1) adjusting the pH value of the percolate concentrated solution to 4, and then adding a composite organic flocculant;
2) standing for 18h, and separating to obtain a suspension;
3) adjusting the pH value of the suspension to 4, and then adding an inorganic flocculant;
4) and stirring and standing, and separating out precipitate, wherein the precipitate is the macromolecular organic pollutant after flocculation separation.
In the step 1), the concentrated leachate is a nanofiltration concentrated solution generated in the process of treating the domestic garbage leachate.
In the step 1), the composite organic flocculant comprises N-aminoethyl-gamma-aminopropyltrimethoxysilane and (3-mercaptopropyl) trimethoxysilane. The mass concentration of the composite organic flocculant in the percolate concentrated solution is 3.5mg/L, and the volume ratio of the N-aminoethyl-gamma-aminopropyltrimethoxysilane to the (3-mercaptopropyl) trimethoxysilane is 1: 1.
In the step 3), the inorganic flocculant is polyaluminium chloride. The mass concentration of the polyaluminium chloride in the suspension is 650 mg/L.
In the step 1) and the step 3), the pH value is adjusted by using a sulfuric acid solution. The concentration of the sulfuric acid solution was 0.8 mol/L.
In the step 4), the stirring process is as follows: quickly stirring for 3min, and slowly stirring for 2 min. In the process of rapid stirring, the rotating speed is 300 r/min; in the process of slow stirring, the rotating speed is 125 r/min.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A method for combined flocculation separation of macromolecular organic contaminants in a concentrate of a diafiltration fluid, which comprises the steps of:
1) adjusting pH of the percolate concentrate to 3.5-4.5, and adding composite organic flocculant;
2) standing for 12-24h, and separating to obtain a suspension;
3) adjusting the pH value of the suspension to 3.5-4.5, and then adding an inorganic flocculant;
4) and stirring and standing, and separating out precipitate, wherein the precipitate is the macromolecular organic pollutant after flocculation separation.
2. The method for combined flocculation separation of macromolecular organic contaminants of a diafiltration concentrate according to claim 1, wherein in step 1) the diafiltration concentrate is a nanofiltration concentrate produced during the treatment of domestic waste leachate.
3. The method for combined flocculation separation of macromolecular organic contaminants in a concentrate of diafiltration fluid according to claim 1, wherein in step 1) and step 3) the pH is adjusted with a sulfuric acid solution.
4. The method for combined flocculation separation of macromolecular organic contaminants in a diafiltration concentrate according to claim 3, wherein the concentration of the sulfuric acid solution is 0.2-1.4 mol/L.
5. The method of claim 1 wherein the composite organic flocculant of step 1) comprises N-aminoethyl- γ -aminopropyltrimethoxysilane and (3-mercaptopropyl) trimethoxysilane.
6. The method for combined flocculation separation of macromolecular organic contaminants in a percolate concentrate according to claim 5, wherein the mass concentration of said composite organic flocculant in the percolate concentrate is 3-4mg/L and the volume ratio of N-aminoethyl- γ -aminopropyltrimethoxysilane to (3-mercaptopropyl) trimethoxysilane is 6 (4-9).
7. The method of claim 1 wherein in step 3) the inorganic flocculant is polyaluminum chloride.
8. The method for combined flocculation separation of macromolecular organic contaminants in diafiltration concentrate according to claim 7, wherein the mass concentration of said polyaluminium chloride in the suspension is 500-800 mg/L.
9. The method for combined flocculation separation of macromolecular organic contaminants in a percolate concentrate according to claim 1, wherein in step 4) the agitation is performed by: quickly stirring for 2.5-3.5min, and slowly stirring for 1.5-2.5 min.
10. The method for combined flocculation separation of macromolecular organic pollutants in a percolate concentrate according to claim 9, wherein during the rapid stirring process, the rotation speed is 200-400 r/min; in the process of slow stirring, the rotating speed is 100-.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116425286A (en) * | 2023-04-14 | 2023-07-14 | 深圳佳国盛环保控股有限公司 | Method for treating percolate membrane concentrate by using composite flocculant |
| CN116621387A (en) * | 2023-06-30 | 2023-08-22 | 青岛水务集团有限公司 | Concentrated solution full-quantification treatment system and method |
| CN116813046A (en) * | 2023-06-30 | 2023-09-29 | 青岛水务集团有限公司 | Treatment method of landfill leachate concentrated solution |
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| CN116425286A (en) * | 2023-04-14 | 2023-07-14 | 深圳佳国盛环保控股有限公司 | Method for treating percolate membrane concentrate by using composite flocculant |
| CN116621387A (en) * | 2023-06-30 | 2023-08-22 | 青岛水务集团有限公司 | Concentrated solution full-quantification treatment system and method |
| CN116813046A (en) * | 2023-06-30 | 2023-09-29 | 青岛水务集团有限公司 | Treatment method of landfill leachate concentrated solution |
| CN116621387B (en) * | 2023-06-30 | 2023-11-14 | 青岛水务集团有限公司 | Concentrated solution full-quantification treatment system and method |
| CN116813046B (en) * | 2023-06-30 | 2024-03-08 | 青岛水务集团有限公司 | Treatment method of landfill leachate concentrated solution |
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