CN103910419A - Method for treating landfill leachate membrane concentration solution by using covalent bond composite flocculant - Google Patents
Method for treating landfill leachate membrane concentration solution by using covalent bond composite flocculant Download PDFInfo
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Abstract
The invention relates to a method for carrying out a curing treatment on landfill leachate membrane concentration solution sludge through a novel curing agent. According to the present invention, a covalent bond type inorganic-organic composite flocculant and silicate cement are compounded to obtain a novel efficient curing agent, and the curing agent can form a powerful curing network so as to efficiently warp and fix contaminants in the sludge during the sludge treatment process; and the method has characteristics of convenient operation and low cost, and can be used for the curing stabilization treatment of the sludge produced through the landfill leachate treatment or landfill leachate membrane concentration solution treatment.
Description
Technical field
The present invention relates to a kind of method of effective treating refuse percolation liquid membrane concentrated solution.Specifically, the present invention adopts covalent linkage composite flocculation agent and inorganic polymer flocculant to carry out simple and effective coagulating treatment to rubbish percolation liquid membrane concentrated solution.
Background technology
China's municipal wastes adopts the method for landfill to process mostly at present, adopts landfill method can produce a large amount of percolates.Percolate is that a kind of water quality and quantity changes greatly, complicated component, organic concentration is high, ammonia-nitrogen content is high, saltiness is high difficult waste water.
Along with the raising of national requirements for environmental protection and the progress of water technology, biochemistry adds membrane treatment process becomes a kind of mainstream technology of percolate processing gradually.Biochemical process can be removed the most organism in percolate, effectively reduces COD, ammonia-nitrogen content.Embrane method processing can be held back the Persistent organic pollutants after biochemical treatment, can guarantee that stable water outlet reaches the requirement of emission concentration limit value in " GB 16889-2008 household refuse landfill sites pollutes control criterion ".
Due to the selection perviousness of nanofiltration membrane and reverse osmosis membrane, water can pass through film smoothly, other compounds more or less even completely tunicle hold back, former water is divided into two parts after film: penetrating fluid after treatment and trapped fluid (concentrated solution).Rubbish percolation liquid membrane concentrated solution is the residual solution that percolate is held back through reverse osmosis membrane (or nanofiltration membrane) after biological degradation.This treatment process based on film can produce more than 30% concentrated solution of the former water yield.Membrane concentration liquid does not generally have biodegradability, and major ingredient is recalcitrant substance in former water, is brownish black, and COD is very high, and contains a large amount of metal ions, and saltiness is very high.The processing of rubbish percolation liquid membrane concentrated solution has become the difficulties of current refuse landfill wastewater treatment.
Current, the main method adopting in membrane concentration liquid treating processes comprise recharge, evaporation, advanced oxidation etc.Recharging essence is using landfill yard as a bacteria bed take rubbish as filler.But, recharging the possibility of groundwater pollution is increased, current can form short circuit, and buring layer water ratio is increased.Concentrated solution directly recharges and also likely causes refuse tip saltiness to increase.Conventional evaporation technology can separate the soluble solids in membrane concentration liquid with water, but energy consumption is higher, and partial organic substances is volatile, easily in evaporative process, enters vapor phase, causes phlegma COD concentration higher, cannot realize qualified discharge.Advanced oxidation can effectively reduce COD content, but investment is large, spend high, and to the salt in membrane concentration liquid without any treatment effect.
Therefore it is very necessary, researching and developing a kind of simple and effective membrane concentration liquid processing method.Coagulating sedimentation is the conventional monotechnics of drinking water treatment and wastewater treatment.In flocculence treating refuse percolation liquid membrane concentrated solution, the property relationship of flocculation agent is to the quality of water treatment effect.Conventional flocculation agent is very low to pollutants removal rate in membrane concentration liquid, and the clearance of COD is in 30% left and right.The present invention utilizes covalent bond type inorganic organic composite flocculant and inorganic polymer flocculant treating refuse percolation liquid membrane concentrated solution, thereby makes a large amount of pollutents wherein transfer to throw out and efficiently be removed from water.
Summary of the invention
The present invention relates to a kind of method of utilizing covalent linkage composite flocculation agent treating refuse percolation liquid membrane concentrated solution.The present invention adopts covalent linkage composite flocculation agent and inorganic polymer flocculant coagulating treatment rubbish percolation liquid membrane concentrated solution, can realize simple, the efficient and low cost harmless treatment of rubbish percolation liquid membrane concentrated solution.
The inorganic polymer flocculant that the present invention adopts refers to polymerization iron, polymeric aluminum and polysilicate aluminum sulphate flocculant, and they only can remove colloidal type particulate matter, uses COD clearance in rubbish percolation liquid membrane concentrated solution in 30% left and right separately.The present invention adopts covalent bond type inorganic organic composite flocculant to refer to patent of invention " a kind of covalent bond type inorganic organic composite flocculant, preparation technology and application thereof " (application number: the covalent bond type inorganic organic composite flocculant 200810115990.8).The sedimentation screen that can give full play to inorganic flocculating agent with the inorganic and organic constituent of covalent bonds in this coagulating agent is caught volume and is swept and the group absorption complexing action of organic floculant, can efficiently remove the pollutents such as COD that inorganic polymer flocculant can not remove.
Specified operational procedure is: get a certain amount of rubbish percolation liquid membrane concentrated solution, add a certain amount of covalent bond type inorganic organic composite flocculant and inorganic polymer flocculant.Covalent bond type inorganic organic composite flocculant dosage is at 10-20000mg/L, and inorganic polymer flocculant dosage is at 10-30000mg/L, and both add order, and who does not first do requirement after whom.After rapid stirring (150～400r/min) 0.5～5min, proceed to low rate mixing (20～140r/min), continue 5～30min, staticly settle 10～60min.The present invention adopts simple flocculating settling, has the advantages such as pollutant removal scope is wide, clearance is high, and dosing is few, processing speed is fast.
The invention provides a kind of method of coagulating treatment rubbish percolation liquid membrane concentrated solution, can be for percolate, rubbish percolation liquid membrane concentrated solution and other membrane process concentrated solution processing.
Embodiment
Further illustrate the present invention with embodiment below, but be not limited to this.
Embodiment 1
Adopt covalent linkage composite flocculation agent and inorganic polymer flocculant to carry out coagulating treatment to percolate nanofiltration membrane concentrated solution.Nanofiltration membrane concentrated solution picks up from a northern landfill yard, and percolate treating process is MBR-ultrafiltration-nanofiltration-water outlet.The COD of percolate nanofiltration membrane concentrated solution
crconcentration is 7426mg/L, and ammonia nitrogen concentration is 237mg/L.Covalent bond type inorganic organic composite flocculant B value is 2, and total aluminium concentration is 0.2mol/L; Inorganic polymer flocculant is selected the poly ferric chloride flocculant agent of commercial grade.Two kinds of flocculation agents add to membrane concentration liquid simultaneously, and dosage is respectively 10000mg/L, will after its rapid stirring (150r/min) 0.5min, proceed to low rate mixing (20r/min), continue 5min, staticly settle 10min.Final outflow water COD
crfor 87mg/L, clearance is 98.8%, and ammonia nitrogen concentration is 29mg/L, and clearance is 87.8%.
Embodiment 2
Adopt covalent linkage composite flocculation agent and inorganic polymer flocculant to carry out coagulating treatment to percolate nanofiltration membrane concentrated solution.Nanofiltration membrane concentrated solution picks up from a northern landfill yard, and percolate treating process is MBR-ultrafiltration-nanofiltration-water outlet.The COD of percolate nanofiltration membrane concentrated solution
crconcentration is 7426mg/L, and ammonia nitrogen concentration is 237mg/L.Covalent bond type inorganic organic composite flocculant B value is 2.5, and total aluminium concentration is 0.2mol/L, and dosage is 20000mg/L, and inorganic polymer flocculant is selected poly-sial, and dosage is 30000mg/L.First add covalent bond type inorganic organic composite flocculant, then add poly-sial, after dosing, after rapid stirring (400r/min) 5min, proceed to low rate mixing (140r/min), continue 30min, staticly settle 60min.Final outflow water COD
crfor 79mg/L, clearance is 98.9%, and ammonia nitrogen concentration is 27mg/L, and clearance is 88.6%.
Embodiment 3
Adopt covalent linkage composite flocculation agent and inorganic polymer flocculant to carry out coagulating treatment to percolate reverse osmosis membrane concentrated solution.Membrane concentration liquid picks up from a northern landfill yard, and percolate treating process is activated sludge process-ultrafiltration-nanofiltration-reverse osmosis-water outlet.The COD of reverse osmosis membrane concentrated solution
crconcentration is 9032mg/L, and ammonia nitrogen concentration is 836mg/L.Covalent bond type inorganic organic composite flocculant B value is 2.5, and total aluminium concentration is 0.2mol/L, and dosage is 20000mg/L, and inorganic polymer flocculant is selected industrial polymerize aluminum chloride, and dosage is 10000mg/L.First add polymerize aluminum chloride, then add covalent bond type inorganic organic composite flocculant, after dosing, after rapid stirring (250r/min) 1.5min, proceed to low rate mixing (50r/min), continue 15min, staticly settle 30min.Final outflow water COD
crfor 82mg/L, clearance is 99.1%, and ammonia nitrogen concentration is 34mg/L, and clearance is 95.9%.
Claims (4)
1. one kind is utilized the method for covalent linkage composite flocculation agent treating refuse percolation liquid membrane concentrated solution, it is characterized in that: use covalent bond type inorganic organic composite flocculant and inorganic polymer flocculant coagulating treatment rubbish percolation liquid membrane concentrated solution, utilize covalent bond type inorganic organic composite flocculant to remove the pollutent such as COD, ammonia nitrogen that inorganic polymer flocculant can not be removed.
2. by method claimed in claim 1, it is characterized in that: get a certain amount of rubbish percolation liquid membrane concentrated solution, add a certain amount of solid covalent bond type inorganic organic composite flocculant and inorganic polymer flocculant, after rapid stirring (150～400r/min) 0.5～5min, proceed to low rate mixing (20～140r/min), continue 5～30min, staticly settle 10～60min.
3. by the method described in claim 1 and 2, it is characterized in that: coagulating treatment rubbish percolation liquid membrane concentrated solution, covalent bond type inorganic organic composite flocculant dosage is at 10-20000mg/L, and inorganic polymer flocculant dosage is at 10-30000mg/L.
4. by the method described in claim 1 and 2, it is characterized in that: the adding order who does not first do requirement after whom of covalent bond type inorganic organic composite flocculant and inorganic polymer flocculant.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087220A (en) * | 2021-04-27 | 2021-07-09 | 同济大学 | Method for separating macromolecular organic pollutants in percolate concentrated solution by combined flocculation |
| 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767854A (en) * | 2010-01-13 | 2010-07-07 | 昆明理工大学 | Coagulating/flocculating method for processing nanofiltration concentrate reject stream of early percolate at refuse landfills |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101767854A (en) * | 2010-01-13 | 2010-07-07 | 昆明理工大学 | Coagulating/flocculating method for processing nanofiltration concentrate reject stream of early percolate at refuse landfills |
Non-Patent Citations (1)
| Title |
|---|
| 彭建雄等: "共价键型硅铝复合絮凝剂的铝形态分布及其絮凝性能研究", 《环境科学》, vol. 30, no. 6, 30 June 2009 (2009-06-30), pages 1705 - 1710 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087220A (en) * | 2021-04-27 | 2021-07-09 | 同济大学 | Method for separating macromolecular organic pollutants in percolate concentrated solution by combined flocculation |
| 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 |
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