CN104496103A - Method for treating landfill leachate concentrated liquid - Google Patents
Method for treating landfill leachate concentrated liquid Download PDFInfo
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- CN104496103A CN104496103A CN201410816098.8A CN201410816098A CN104496103A CN 104496103 A CN104496103 A CN 104496103A CN 201410816098 A CN201410816098 A CN 201410816098A CN 104496103 A CN104496103 A CN 104496103A
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Abstract
The invention discloses a method for treating a landfill leachate concentrated liquid. The method mainly comprises the following steps: feeding the landfill leachate concentrated liquid into a material separation membrane device to remove organic matters such as humic acid in the landfill leachate concentrated liquid, carrying out evaporative concentration treatment on a membrane-permeable liquid, namely, a landfill leachate concentrated liquid which penetrates through the material separation membrane to obtain evaporated residue, evaporated condensed water and exhausted condensed water, wherein the recovered organic matters such as humic acid are treated and backwards sprayed into an incinerator or are used for producing such products as humic fertilizers from humic acid as a raw material; a first evaporation concentrated product, namely, evaporated residue is backwards sprayed into the incinerator or is cured by virtue of asphalt and filled; and second evaporation concentrated products, namely, evaporated condensed water and exhausted condensed water are discharged with standard level or used as reuse water. By the method, zero-emission treatment of the landfill leachate concentrated liquid is achieved; and compared with the existing method for treating the landfill leachate concentrated liquid, the method has the advantages of stability in operation, high treatment efficiency, low operating cost, easiness in management, no secondary pollution and the like.
Description
Technical field
The present invention relates to the technical field of sewage of environment protection, particularly relate to the treatment process of a kind of efficient stable operation to the concentrated solution produced in landfill leachate treatment process.
Background technology
The Environmental capacity of city garbage percolate is a great problem in municipal wastes Landfill.Within 2008, China issues the GB 16889-2008 " household refuse landfill sites Environmental capacity standard " implementing new revision, has made regulation, wherein to BOD in percolate to existing and newly-built consumer waste landfill percolate Pollutant emission concentration limit value
5, COD, ammonia nitrogen, total nitrogen, the index such as heavy metal propose stricter emission standard, this plays very important effect for the effective harm of control percolate to environment.And along with the raising of standard, the process of percolate more have employed the combination process of biochemistry+membrane filtration.NF, RO film is more and more used in landfill leachate treatment, and the utilization of film has lot of advantages, and as outlet effect is good, floor space is little, but while qualified discharge supernatant liquor, also inevitably creates a collection of concentrated solution.
The major ingredient that percolate concentrates liquid is the material such as non-degradation of organic substances residual in Humus material, secondary treatment yielding water and dissolved phenols (SMP), generally not there is biodegradability, usual B/C<0.1, mostly in brownish black, colourity is large, turbidity, specific conductivity and COD are high, and containing a large amount of metal ions, TDS is between 20000mg/L ~ 60000mg/L.The wherein concentrated solution of nanofiltration and reverse osmosis process generation, COD is usually at more than 5000mg/L, and ammonia nitrogen concentration is about 50 ~ 200mg/L, and specific conductivity is about 40000 ~ 50000us/cm.If these percolates and concentrated solution thereof are not dealt carefully with, can severe contamination water body, soil, air etc., even directly threat ecotope and human health.
The percolate of 6.4 ten thousand tons is about produced every day in current China landfill of life waste treatment facility, and the concentrated solution volume produced in the process for the treatment of refuse percolate accounts for 20% ~ 25% of percolate stoste volume, flow is large, Forwarding Expenses is higher, intractability is large, once mishandling being easy to of concentrated solution causes serious secondary pollution.
The treatment process that percolate concentrates liquid adopts more mainly Concentrated liquid recharge method, advanced oxidation processes, method of evaporation and membrane distillation method.But above several method respectively has weak point, as Concentrated liquid recharge method exists the Pollution risk to underground water, and add water ratio and the saltiness of Aerated Landfill Layers, take a long view, increase intractability and the cost of percolate; Advanced oxidation processes is comparatively slow to the degradation speed of total organic content in concentrated solution, and little to the ionic species effect in concentrated solution, a large amount of oxidising agent add the processing cost too increasing concentrated solution; Method of evaporation is treatment process the most thoroughly, but required energy consumption is high, and the easy fouling of evaporation installation; Membrane distillation method film cost is high, distillating ventilating amount is little, and due to the impact of temperature polarization and concentration polarization, running status is unstable, and membrane distillation is a process having phase transformation, heat transmits thus efficiency lower (generally only having about 30%) mainly through heat conducting situation.
In sum, research and develop the concentrated solution treatment technology be applied in Practical Project, become more and more urgent, more and more cause the attention of relevant departments.
Summary of the invention
Based on the problem existing for above-mentioned prior art, the invention provides the treatment process that a kind of percolate concentrates liquid, percolate can be removed and concentrate the organism such as the humic acid in liquid, realize process further and reach the zero discharge treatment that percolate concentrates liquid, and it is stable, processing efficiency is high, running cost is low, be easy to management, non-secondary pollution, is adapted at percolate and concentrates in liquid process engineering and promote.
For solving the problems of the technologies described above, the invention provides the treatment process that a kind of percolate concentrates liquid, comprising:
Step 1, percolate is concentrated liquid and send in feed separation film device, be separated the refractory organic removed in concentrated solution, obtaining through the concentrated solution of feed separation film device separatory membrane is permeate;
Step 2, adopts evaporation mode to carry out evaporation concentration process to the permeate that step 1 produces, and obtains residue on evaporation and phlegma and is vented water of condensation two kinds of products.
In above-mentioned treatment process, also comprise in percolate being concentrated before liquid sends into feed separation film device of step 1:
Liquid is concentrated to percolate and carries out pre-treatment.
In above-mentioned treatment process, pre-treatment is: the metal ion in concentrated solution removed by treating refuse percolate concentrated solution, and described process adopts any one in lime method, lime-Method of Soda and lime-gypsum.
In the step 2 of above-mentioned treatment process, adopt evaporation mode to carry out evaporation concentration process to the permeate that step 1 produces and comprise:
Adopt submerged combustion evaporation concentrate, mechanical compression type thermo-compression evaporation concentrate and negative pressure evaporation concentrates or multiple-effect evaporation concentrate in any one.
In the evaporation concentration process of above-mentioned treatment process, in evaporation concentration device used, add Scale inhibitors.
Above-mentioned treatment process also comprises: the residue on evaporation obtained described evaporation concentration process returns and is sprayed onto incinerator or landfill after bituminization; The evaporation condensed water that evaporation concentration process is obtained and exhaust water of condensation qualified discharge or be used as reuse water; Return after the refractory organic tackled by the feed separation film device of step 1 reclaims be sprayed onto incinerator or after sterilising treatment for the production of fertilizer.
Compared with existing treatment process, the present invention has following beneficial effect:
(1) employing has the feed separation film device that can extract the organism membrane modules such as soil ulmin, effectively can remove percolate and concentrate the organism such as the soil ulmin in liquid, alleviate the dirt deposition scale formation of permeate in evaporation concentration device to a great extent, thermo-efficiency can be improved simultaneously, reduce the residue generation in subsequent evaporation concentration process, achieve evaporation concentration less energy-consumption, high energy efficiency; (2) residue on evaporation that the organism such as the soil ulmin reclaimed and evaporation concentration produce all conveniently carries out safe and effective process, by product can not be caused the secondary pollution of environment, achieve concentrated solution treatment zero draining.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow sheet that the percolate of the embodiment of the present invention concentrates the treatment process of liquid;
Fig. 2 is the process flow sheet that the percolate of the embodiment of the present invention one concentrates the treatment process of liquid;
Fig. 3 is the process flow sheet that percolate that the present invention executes example two concentrates the treatment process reality of liquid;
Fig. 4 is the process flow sheet that the percolate of the embodiment of the present invention three concentrates the treatment process of liquid;
Fig. 5 is the process flow sheet that the percolate of the embodiment of the present invention four concentrates the treatment process of liquid.
Embodiment
Be clearly and completely described the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection scope of the present invention.
The embodiment of the present invention provides a kind of percolate to concentrate the treatment process of liquid, and as shown in Figure 1, concrete steps are as follows:
(1) percolate being concentrated liquid a (hereinafter referred to as concentrated solution) sends in feed separation film device B, and to remove the refractory organics such as humic acid in concentrated solution, the concentrated solution wherein through feed separation film is permeate c;
(2) permeate step (1) produced adopts evaporation mode to carry out evaporation concentration process (adopting evaporation concentration treatment unit C), produce two kinds of products, first product d is residue on evaporation, and the second product e is phlegma and exhaust water of condensation.
Described concentrated solution, before entering feed separation film device, first carries out pre-treatment to concentrated solution.Effectively, pre-treatment can adopt lime method or lime-Method of Soda or lime-gypsum or other to have the method for equivalent effect to remove Ca in concentrated solution
2+, Mg
2+deng metal ion, reduce the load of feed separation film device, also alleviate the inorganic salt scale formation of permeate in evaporation concentration device to a great extent, extend the continuous operating time of evaporation concentration system, improve thermo-efficiency.
In aforesaid method, have employed feed separation film device, the hardly degraded organic substance b such as the most of humic acid in concentrated solution are tackled, the load of evaporation unit can be reduced, also alleviate the dirt deposition scale formation of permeate in evaporation concentration device to a great extent, effectively can improve thermo-efficiency simultaneously.Return after the organism b such as the humic acid be blocked reclaims be sprayed onto incinerator D or after sterilizing and respective handling for the production of being that the product of raw material is as humic acid fertilizers etc. with humic acid.Reclaiming the feed separation film after the organism such as humic acid can with clear water or the water backwash up to standard of concentrated solution treatment system.Containing organism such as a small amount of humic acid in backwash water, but do not affect processing power and the operation stability of whole garbage percolation liquid treating system, raw refuse percolation liquid treating system can be back to or recharge in rubbish storage hole.
In aforesaid method, to permeate evaporation concentration treatment process, general employing submerged combustion evaporation concentrated (SCE evaporation) or mechanical compression type thermo-compression evaporation concentrate (MVC evaporation) or negative pressure evaporation is concentrated or multiple-effect evaporation concentrates, especially MVC evaporation concentration, utilize the existing heat energy of the secondary steam in evaporation unit, steam is provided in addition without the need to outside, evaporation unit self-circulation is relied on to realize evaporation concentration, both waste steam was taken full advantage of, reclaim again latent heat, improve thermo-efficiency, realize the object reducing energy consumption, decreasing pollution doulbe-sides' victory.
In aforesaid method, to the first product d mainly residue on evaporation after permeate evaporation concentration, its main component is not volatile organic matter residual in permeate, can return and be sprayed onto incinerator D, original incineration residue can not be affected, or after bituminization landfill; Second product e is phlegma and exhaust water of condensation mainly, qualified discharge or for feed separation film backwash or replace clear water configuration chemical reagent required in concentrated solution treating processes, wherein membrane backwashing is back to raw refuse percolation liquid treating system or recharges in rubbish storage hole.
In aforesaid method, enter before evaporation concentration device carries out evaporation concentration process at permeate and add a small amount of Scale inhibitors, to prevent Ca residual in permeate
2+, Mg
2+fouling in evaporation concentration device, thus the working time of influential system and heat transfer efficiency.Wherein the addition of Scale inhibitors is complied with the water quality of different field conditions and permeate and determines.
It should be noted that, if the sewage of process is the sewage that the concentrated solution that produces in immature percolate (landfill time < 5 years) film treating processes or concentration of metal ions are low, can directly sends into feed separation film device without pre-treatment and carry out subsequent disposal.
Compared with existing concentrated solution evaporation process method, method of the present invention has the following advantages:
(1) by before concentrating liquid at percolate and sending into feed separation film device, carry out pre-treatment and eliminate most of Ca in concentrated solution
2+, Mg
2+, significantly reduce the generation of evaporation unit inorganic salt fouling condition, thus improve heat conduction efficiency, extend the continuous operating time of system; (2) feed separation film is the organic membrane modules such as a kind of extraction soil ulmin, this membrane module is adopted to remove the organism such as soil ulmin, also the dirt deposition scale formation of permeate in evaporation concentration device is alleviated to a great extent, thermo-efficiency can be improved simultaneously, reduce the residue generation in subsequent evaporation concentration process, achieve evaporation concentration less energy-consumption, high energy efficiency; (3) residue on evaporation that the organism such as the soil ulmin reclaimed and evaporation concentration produce all obtains and processes safely and effectively, avoids the secondary pollution of by product to environment, achieves concentrated solution treatment zero draining.In summary, the invention provides the method for the treatment of refuse percolate concentrated solution, be the combination process adopting feed separation film to add evaporation concentration treating refuse percolate concentrated solution, achieve the zero release that percolate concentrates liquid.The method be also applicable to process simultaneously concentration of metal ions greatly, other class sewage of not easily biochemical treatment or the easy fouling of MVC evaporation concentration.Its treatment effect is reliable and stable, and running cost is low, economic and reliable.
Below in conjunction with the drawings and specific embodiments, treatment process of the present invention is described further.
Embodiment one
The percolate of the present embodiment concentrates the treatment process of liquid, and as shown in Figure 2, in figure, percolate concentrates liquid a first through lime method pre-treatment A process in technical process, and removal percolate concentrates the Ca in liquid a
2+, Mg
2+deng sending into again after metal ion in feed separation film device B.Concentrated solution divide into two portions after feed separation film, and a part is the organism b such as the soil ulmin tackled through feed separation film, and a part is through the permeate c of film.Wherein the organism b such as soil ulmin sends into incinerator D after recycling, and permeate c sends in mechanical compression heat pump evaporation concentration device C (MVC concentrating unit) and carries out evaporation concentration process.Permeate c is after MVC evaporation concentration, and the phlegma after evaporative condenser and the exhaust water of condensation i.e. direct qualified discharge of the second product e, the residue on evaporation after evaporation concentration i.e. the first product d sends into incinerator D.
Permeate c be about that percolate concentrates liquid a total amount about 80%, compared with the direct evaporating and concentrating process of concentrated solution, greatly reduce evaporation treatment capacity, reduce energy consumption, save processing cost.The MVC evaporation concentration method adopted in the present embodiment can run 80 DEG C time, and secondary steam uses as heating steam, improves Waste Heat Reuse rate, save energy, and start/stop flexibly, running cost is low.The lime method pre-treatment A adopted in the present invention and feed separation film device B solves the difficult problem such as fouling in MVC evaporating concentration process, large, the regular cleaning during shutdown scale removal of heat transmission resistance, highlights operational process less energy-consumption of the present invention, high energy efficiency, economically viable advantage.Effective process of first product d-residue on evaporation that the organism b such as soil ulmin and evaporation concentration produce, avoids the by product that produces in concentrated solution treating processes to the secondary pollution of environment.
Embodiment two
The percolate of the present embodiment concentrates the treatment process of liquid, and as shown in Figure 3, its treatment scheme is substantially identical with embodiment one in technical process.The organism b such as difference is, the soil ulmin of recovery are sent to the factory producing Humus chemical fertilizer E after the process such as sterilizing.The evaporation concentration device of permeate c adopts submerged combustion evaporation concentrating unit C, and a second product e part after evaporative condenser replaces the chemical reagent such as the white lime in clear water preparation preprocessing process, rest part qualified discharge, has saved water resources, achieves effective reuse of qualified discharge water.
Embodiment three
The percolate of the present embodiment concentrates the treatment process of liquid, and as shown in Figure 4, its treatment scheme is substantially identical with embodiment one in technical process.Difference is, permeate c adopt lime-Method of Soda carry out pre-treatment, the second product e in mechanical compression heat pump evaporation concentration device C after evaporative condenser for replacing clean water feed separation film, the first product d landfill F after bituminization.The method also achieves the zero discharge treatment that percolate concentrates liquid a, effective reuse of qualified discharge water.
Embodiment four
The percolate of the present embodiment concentrates the treatment process of liquid, and as shown in Figure 5, its treatment scheme is substantially identical with embodiment one in technical process.Difference is, percolate concentrates liquid a and directly sends into feed separation film B without pre-treatment.The method is applicable to the concentrated solution that the low immature percolate (garbage loading embeading time <5) of process metal ion content produces.
Treatment process of the present invention realizes with a kind of combining process to dispose garbage percolate concentrated solution, efficient, cost is low, easy to operate, non-secondary pollution.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (6)
1. percolate concentrates a treatment process for liquid, it is characterized in that, comprising:
Step 1, percolate is concentrated liquid and send in feed separation film device, be separated the refractory organic removed in concentrated solution, obtaining through the concentrated solution of feed separation film device separatory membrane is permeate;
Step 2, adopts evaporation mode to carry out evaporation concentration process to the permeate that step 1 produces, and obtains residue on evaporation and phlegma and is vented water of condensation.
2. percolate according to claim 1 concentrates the treatment process of liquid, it is characterized in that, describedly also comprises in being concentrated by percolate before liquid sends into feed separation film device of step 1:
Liquid is concentrated to percolate and carries out pre-treatment.
3. percolate according to claim 2 concentrates the treatment process of liquid, it is characterized in that, described pre-treatment is: the metal ion in concentrated solution removed by treating refuse percolate concentrated solution, and described process adopts any one in lime method, lime-Method of Soda and lime-gypsum.
4. the percolate according to any one of claims 1 to 3 concentrates the treatment process of liquid, it is characterized in that, in described step 2, adopts evaporation mode to carry out evaporation concentration process to the permeate that step 1 produces and comprises:
Adopt submerged combustion evaporation concentrate, mechanical compression type thermo-compression evaporation concentrate and negative pressure evaporation concentrates or multiple-effect evaporation concentrate in any one.
5. percolate according to claim 4 concentrates the treatment process of liquid, it is characterized in that, in described evaporation concentration process, in evaporation concentration device used, adds Scale inhibitors.
6. percolate according to claim 4 concentrates the treatment process of liquid, it is characterized in that, also comprises: the residue on evaporation obtained described evaporation concentration process returns and is sprayed onto incinerator or landfill after bituminization;
The evaporation condensed water that evaporation concentration process is obtained and exhaust water of condensation qualified discharge or be used as reuse water;
Return after the refractory organic tackled by the feed separation film device of step 1 reclaims be sprayed onto incinerator or after sterilising treatment for the production of fertilizer.
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| CN107522350A (en) * | 2016-06-22 | 2017-12-29 | 北京众力清源环保科技有限公司 | Waste Water Treatment and method of wastewater treatment |
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| CN112919694A (en) * | 2021-01-27 | 2021-06-08 | 成都硕特环保科技有限公司 | Integrated treatment method and system for leachate of garbage transfer station |
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Application publication date: 20150408 |