CN110627255A - Method for nanofiltration water inlet pretreatment of percolate of waste incineration plant - Google Patents
Method for nanofiltration water inlet pretreatment of percolate of waste incineration plant Download PDFInfo
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- CN110627255A CN110627255A CN201910962895.XA CN201910962895A CN110627255A CN 110627255 A CN110627255 A CN 110627255A CN 201910962895 A CN201910962895 A CN 201910962895A CN 110627255 A CN110627255 A CN 110627255A
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- China
- Prior art keywords
- nanofiltration
- waste incineration
- incineration plant
- water
- leachate
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Classifications
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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
- C02F1/66—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
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a method for nanofiltration water inlet pretreatment of leachate of a waste incineration plant, which is characterized by comprising the following steps of: step 1: adding polyaluminium chloride (PAC) into nanofiltration inlet water of percolate of a waste incineration plant, and controlling the concentration of the added PAC to be 90-110 mg/L; step 2: adding hydrochloric acid, adjusting the pH value of the water sample to 4.5-5.5, and stirring; and step 3: adding polyacrylamide (PAM910), controlling the concentration of the added polyacrylamide to be 3.5-4.5mg/L, stirring, and settling to obtain pretreated leachate nanofiltration inlet water of the waste incineration plant. The method has the advantages of high removal rate, low cost and stable effect, and can effectively remove humus organic matters in the ultrafiltration effluent (nanofiltration influent).
Description
Technical Field
The invention relates to a method for preprocessing nanofiltration inlet water of percolate in a garbage incineration plant, which reduces and removes organic matters in the nanofiltration inlet water through a coagulation technology, relieves the pollution of a nanofiltration membrane and improves the membrane flux.
Background
The main treatment modes of the municipal solid waste are landfill, incineration and composting. Compared with other treatment modes, the incineration method has the advantages of small floor area, high volume reduction rate, high treatment speed, thorough harmlessness, capability of using waste heat for power generation or heat supply and the like. A large amount of landfill leachate is generated in the process of fermentation before incineration, the components are complex, the odor is easy to generate, and the landfill leachate contains a lot of toxic and harmful substances, and if the landfill leachate is not treated in time, surface water and underground water can be polluted, so that the environment and the human health are harmed. The leachate treatment generally adopts a combined treatment process of biochemistry and membrane systems (ultrafiltration-microfiltration-nanofiltration-reverse osmosis), wherein the biochemical treatment generally adopts an anaerobic Membrane Bioreactor (MBR) or an anaerobic and secondary anaerobic Aerobic (AO) process. The organic matters contained in the ultrafiltration effluent in the combined treatment process are mainly humus which is difficult to biodegrade.
Disclosure of Invention
Aiming at the defects of the combined treatment process of biochemical treatment and membrane system of leachate in incineration plants, the invention aims to provide a method which has high removal rate and low cost, can effectively remove humus organic matters in nanofiltration inlet water (namely ultrafiltration outlet water), improves membrane flux and relieves membrane pollution.
In order to achieve the aim, the invention provides a method for nanofiltration influent pretreatment of leachate in a waste incineration plant, which is characterized by comprising the following steps of:
step 1: adding polyaluminium chloride (PAC) into nanofiltration inlet water of percolate of a waste incineration plant, and controlling the concentration of the added PAC to be 90-110 mg/L;
step 2: adding hydrochloric acid, adjusting the pH value of the water sample to 4.5-5.5, and stirring;
and step 3: adding polyacrylamide (PAM910), controlling the concentration of the added polyacrylamide to be 3.5-4.5mg/L, stirring, and settling to obtain pretreated leachate nanofiltration inlet water of the waste incineration plant.
Preferably, the stirring speed in step 2 is 180-220rpm (revolutions per minute), and the stirring time is 1-3 min.
Preferably, the stirring speed in the step 3 is 60-100rpm (revolutions per minute), and the stirring time is 15-20 min.
Preferably, the settling time in step 3 is 20-40 min.
Coagulation is one of the oldest water quality purification treatment methods, and is a widely applied technology. The coagulation process serves two purposes: firstly, discrete tiny particles in raw water are destabilized; the second is to enable the destabilized microparticles to bind into floccules. The essence of the coagulation process is that the added coagulant is rapidly contacted with pollutants such as colloidal particles in the water body and the like, and a chemical reaction is generated, so that the substances to be removed and the water body are separated out due to the obvious difference in physical properties. The flocculant PAM has a function of causing small particles precipitated during the mixing process to collide with each other and causing initial aggregate growth to increase.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of adding PAC (polyaluminium chloride) to enable colloidal particles and a coagulant to perform adsorption to form flocs, settling and separating under the action of gravity, and enabling the floc particles to aggregate and settle through the flocculation action of PAM (polyacrylamide) to remove most humus organic matters. Nanofiltration inlet water can directly enter a membrane treatment system after being pretreated by the method, so that membrane pollution is relieved, and membrane flux is improved.
The invention adopts a coagulation method to pretreat the ultrafiltration effluent, reduces the concentration of organic matters in the nanofiltration effluent, relieves membrane pollution, improves the membrane flux, provides guarantee for the stable operation of a subsequent nanofiltration and reverse osmosis membrane system, and saves the treatment cost. The method has the advantages of high removal rate, low cost and stable effect, and can effectively remove humus organic matters in the ultrafiltration effluent (nanofiltration influent).
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Each raw material used in the following examples is a commercially available product.
Examples
The method is used for pretreating nanofiltration inlet water of leachate of a waste incineration plant.
The nanofiltration influent water contains a large amount of humus organic matter, the COD of the nanofiltration influent water is 272mg/L, and the pH value of the nanofiltration influent water is 6.9. The method comprises the following steps:
(1) adding a small amount of 10g/L polyaluminium chloride (PAC) into nanofiltration inlet water of percolate of a waste incineration plant, and controlling the concentration of the added PAC to be 100 mg/L;
(2) adding 20% (mass ratio) HCl, adjusting the pH value of the water sample to 5, and stirring at the speed of 200rpm for 2 min;
(3) adding 10g/L polyacrylamide (PAM910), controlling the concentration of the added polyacrylamide to be 4mg/L, stirring at 80rpm for 18min, settling for 30min to obtain pretreated leachate nanofiltration inlet water of the waste incineration plant, and directly entering a membrane treatment system for membrane filtration treatment.
The membrane separation experiment was performed on the nanofiltration influent raw water and the coagulated water sample respectively under the condition of a membrane pressure of 0.4MPa (same as the actual operating pressure of the nanofiltration membrane in the waste incineration plant), and the results are shown in Table 1.
TABLE 1 comparison of nanofiltration influent and Experimental Water sample Membrane separation data
In the membrane separation experiment after the nanofiltration influent coagulation, the removal rate of nanofiltration influent organic matters (COD) by coagulation reaches 55.1%, the flow rate of the coagulated membrane is improved by 35.8%, which indicates that the nanofiltration influent water can effectively remove the organic matters, relieve membrane pollution, increase the flux of the fresh water membrane and prolong the service life of the membrane system in the coagulation treatment.
The cost of the reagents required for this process (see Table 2) is only 0.262 yuan/t.
TABLE 2 cost of reagents for nanofiltration influent coagulation treatment (influent COD 272mg/L)
| Name of medicament | Monovalent (Yuan/kg) | Optimum dosage | Cost of treatment (Yuan/t) |
| Polyaluminum chloride (PAC) | 2 | 100(mg/L) | 0.20 |
| Polyacrylamide (PAM) | 15 | 4(mg/L) | 0.06 |
| HCl | 1.3 | 1.8(mg/L) | 0.002 |
Claims (4)
1. A method for nanofiltration water inlet pretreatment of leachate in a waste incineration plant is characterized by comprising the following steps of:
step 1: adding polyaluminium chloride into nanofiltration inlet water of percolate of a waste incineration plant, and controlling the concentration of added PAC to be 90-110 mg/L;
step 2: adding hydrochloric acid, adjusting the pH value of the water sample to 4.5-5.5, and stirring;
and step 3: adding polyacrylamide, controlling the concentration of the added polyacrylamide to be 3.5-4.5mg/L, stirring, and settling to obtain pretreated nanofiltration inlet water of the leachate of the waste incineration plant.
2. The method for the nanofiltration influent pretreatment of leachate of a waste incineration plant as set forth in claim 1, wherein the stirring speed in the step 2 is 180-220rpm and the stirring time is 1-3 min.
3. The method for nanofiltration influent pretreatment of leachate from a waste incineration plant as set forth in claim 1, wherein the stirring speed in step 3 is 60-100rpm and the stirring time is 15-20 min.
4. The method for nanofiltration feed water pretreatment of landfill leachate according to claim 1, wherein the settling time in step 3 is 20-40 min.
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| CN201910962895.XA CN110627255A (en) | 2019-10-11 | 2019-10-11 | Method for nanofiltration water inlet pretreatment of percolate of waste incineration plant |
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| CN201910962895.XA CN110627255A (en) | 2019-10-11 | 2019-10-11 | Method for nanofiltration water inlet pretreatment of percolate of waste incineration plant |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1923726A (en) * | 2006-10-13 | 2007-03-07 | 北京工商大学 | Method of treating refuse percolating liquid by aerobic nitration/inverse nitration and coagulated technology |
| CN101701025A (en) * | 2009-10-30 | 2010-05-05 | 华南理工大学 | Method for extracting humus acid from concentrated waste percolate and treating waste water |
| CN103449664A (en) * | 2013-08-14 | 2013-12-18 | 南京万德斯环保科技有限公司 | Treatment method of landfill leachate |
| CN109354292A (en) * | 2018-12-14 | 2019-02-19 | 湖南军信环保股份有限公司 | A kind of minimizing treatment process of landfill leachate film-filter concentration liquid |
| CN109851118A (en) * | 2019-03-07 | 2019-06-07 | 任旭 | The method for removing hardly degraded organic substance in power generation by waste combustion factory percolation liquid membrane concentrate |
-
2019
- 2019-10-11 CN CN201910962895.XA patent/CN110627255A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1923726A (en) * | 2006-10-13 | 2007-03-07 | 北京工商大学 | Method of treating refuse percolating liquid by aerobic nitration/inverse nitration and coagulated technology |
| CN101701025A (en) * | 2009-10-30 | 2010-05-05 | 华南理工大学 | Method for extracting humus acid from concentrated waste percolate and treating waste water |
| CN103449664A (en) * | 2013-08-14 | 2013-12-18 | 南京万德斯环保科技有限公司 | Treatment method of landfill leachate |
| CN109354292A (en) * | 2018-12-14 | 2019-02-19 | 湖南军信环保股份有限公司 | A kind of minimizing treatment process of landfill leachate film-filter concentration liquid |
| CN109851118A (en) * | 2019-03-07 | 2019-06-07 | 任旭 | The method for removing hardly degraded organic substance in power generation by waste combustion factory percolation liquid membrane concentrate |
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