CN102951741B - Landfill leachate deep processing technology and special equipment - Google Patents
Landfill leachate deep processing technology and special equipment Download PDFInfo
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- CN102951741B CN102951741B CN201210289032.9A CN201210289032A CN102951741B CN 102951741 B CN102951741 B CN 102951741B CN 201210289032 A CN201210289032 A CN 201210289032A CN 102951741 B CN102951741 B CN 102951741B
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Abstract
The invention discloses a landfill leachate deep processing technology and special equipment. The technology is characterized in that the landfill leachate is subjected to multiple nanofiltration and separation treatment of a special membrane system so that the landfill leachate concentrate is recycled and turned into wealth; and the discharge of pollutants is reduced, and the economic benefits are increased.
Description
Technical field
The invention belongs to environmental technology field, specifically just relate to a kind of percolate be carried out to advanced treatment through MBR water outlet after treatment, the concentrated solution that makes to obtain carries out recycling and reaches technique and the specific equipment thereof of waste water decrement discharge object.
Background technology
Along with increasing of China's city quantity increase and population, municipal wastes is also with sharp increase, and the situation of garbage-surrounded city is very severe.At present, refuse treatment is mainly taking landfill and burning as main, wherein landfill remains main mode, and accounting, between 451-501, is burned accounting 121 left and right, another still have 30% domestic refuse to fail to process, compared with landfill, burning method can effectively reduce rubbish capacity more than 75%, saves soil, be difficult for producing the pollution such as sewage permeation, and produce calorific value and can be used for heat supply, generating etc. and recycle.Therefore, the processing mode of waste incineration will be widelyd popularize.
But refuse treatment is no matter be to take landfill, or the mode of burning, the processing of percolate is all technical barrier wherein.Percolate belongs to high concentration hard-degraded organic waste water, have that complicated component, Pollutant levels are high, biological nutrition proportional imbalance, colourity be high, the feature that stink is large, biodegradability is poor, therefore, the processing of percolate is faced with the insoluble technical barrier of some always.At present, percolate mainly adopts the main process of biochemical system+MBR+ nanofiltration+reverse-osmosis treated, makes waste water can reach emission standard.Although this technique adopts in a large number, also there are some problems:
First, dense water treatment loss is large, and the concentrated solution of film processing system belongs to the waste liquid of high organism high salinity, and how processing concentrated solution is to produce the difficult problem that must solve.At garbage incinerating power plant, concentrated solution is generally used for flyash curing, or returns spray incinerator and dissolve.Because dissolving of flyash curing is limited in one's ability, therefore also have a large amount of concentrated solutions to have to burn.There are a lot of drawbacks but return spray burning, not only lose combustion heat value, also can cause very large corrosion to burning facility, shorten the life-span of burning facility; And in refuse landfill, the concentrated solution of film processing system generally recharges landfill district, carry out decrement by modes such as evaporation, infiltrations, but the salinity of concentrated solution accumulates in treatment system all the time, finally can cause treatment system paralysis.
Secondly, the water rate of recovery for the treatment of system is not high, and it is the professional target of percolate processing that the high power of water reclaims, current membrane treatment process, and the combination rate of recovery of nanofiltration+reverse osmosis process is not higher than 65%.The waste water of a large amount for the treatment of systems can not get recycling direct exhaust emission environment.
Summary of the invention
For the not high technical barrier of concentrated solution recycling rate in current garbage leachate treatment process.Object of the present invention is just to provide percolate advanced treatment process and specific equipment, and the concentrated liquid of percolate is got utilization, and turns waste into wealth; Can reduce the discharge of pollutent, be improved again economic benefit.
Technical scheme
In order to realize above-mentioned technical purpose, the present invention designs a kind of percolate advanced treatment process, and it comprises following step: the water outlet first percolate being obtained through MBR system is carried out one-level nanofiltration processing and obtained one-level nanofiltration product water and concentrated solution; Then the product water obtaining through one-level nanofiltration processing is carried out to reverse-osmosis treated, concentrated solution carries out the one-level that one-level membrane separation obtains and sees through liquid and one-level concentrated solution; Then the one-level obtaining in second step is seen through to liquid and carry out secondary nanofiltration processing, one-level concentrated solution carries out secondary membrane separation and obtains secondary through liquid and secondary concentrated solution; Finally the secondary obtaining in the 3rd step is seen through to liquid and proceed one-level membrane separation, secondary concentrated solution as fertilizer sources uses.
Further, by the product water reuse obtaining through reverse-osmosis treated in described second step, concentrated solution carries out high pressure recycling.
Further, described in, carry out one-level membrane separation and secondary membrane separation process and comprise pre-treatment and two stages of membrane separation.
According to a kind of percolate advanced treatment process specific equipment of above-mentioned technological design, it comprises nanofiltration raw water box, nanofiltration raw water box output terminal is connected with one-level nanofiltration membrane component, on nanofiltration raw water box and one-level nanofiltration membrane component connecting pipeline, one-level nanofiltration water pump is housed successively, accurate filter and high-pressure pump, the liquid outlet that sees through of one-level nanofiltration membrane component is connected to reverse osmosis raw water box, concentrated solution outlet is connected to material film system raw water box, material film system raw water box exit end is connected to one-level pretreatment system, on material film system raw water box and one-level pretreatment system connecting pipeline, one-level water pump is housed, one-level pretreatment system output terminal is connected with a stage material membrane module, on one-level pretreatment system and a stage material membrane module connecting pipeline, one-level accurate filter and one-level high-pressure pump are housed successively, the liquid outlet that sees through of one stage material membrane module is connected to the middle water tank that produces, dense water tank in the middle of concentrated solution outlet is connected to, the middle water tank exit end that produces is connected to secondary nanofiltration membrane component, middle producing on water tank and secondary nanofiltration membrane component connecting pipeline is equipped with secondary nanofiltration water pump, secondary nanofiltration accurate filter and secondary nanofiltration high-pressure pump successively, the product water out of secondary nanofiltration membrane component connects back reverse osmosis raw water box, and concentrated solution takes back the reuse of refuse biochemical system, middle dense water tank outlet is connected to secondary pretreatment system, on middle dense water tank and secondary pretreatment system connecting pipeline, secondary water pump is housed, secondary pretreatment system output terminal is connected with two stage material membrane modules, on secondary pretreatment system and two stage material membrane module connecting pipelines, secondary accurate filter and secondary high-pressure pump are housed successively, two stage material membrane modules produce water out and connect back material film system raw water box, and two stage material membrane module concentrated solution outlets connect collection box, described reverse osmosis raw water box water side is connected to reverse osmosis membrane assembly, on reverse osmosis raw water box and reverse osmosis membrane assembly connecting pipeline, feed water by reverse osmosis pump is housed successively, reverse osmosis accurate filter and reverse osmosis high-pressure pump, reverse osmosis membrane assembly produces water out and connects product water reuse case, reverse osmosis membrane assembly concentrated solution outlet is connected to concentrated solution pretreatment system, concentrated solution pretreatment system exit end is connected to high-pressure membrane system raw water box, high-pressure membrane system raw water box exit end is connected to high-pressure membrane assembly, on high-pressure membrane system raw water box and high-pressure membrane assembly connecting pipeline, high-pressure membrane intake pump is housed successively, high-pressure membrane accurate filter and high-pressure membrane high-pressure pump, high-pressure membrane assembly concentrated solution outlet is equipped with high level salt solution collection box, see through liquid and be connected to product water reuse case.
Further, water circulating pump is housed in described one-level nanofiltration membrane component, secondary nanofiltration membrane component, a stage material membrane module, two stage material membrane modules, reverse osmosis membrane assembly, high-pressure membrane assembly and moves under regime flow for maintaining film system, avoid the pollutant sediment on film surface.
Further, the two ends of described one-level nanofiltration membrane component, secondary nanofiltration membrane component, a stage material membrane module, two stage material membrane modules, reverse osmosis membrane assembly, high-pressure membrane assembly are all connected to film cleaning system.
Beneficial effect
The technique effect that the present invention obtains is mainly:
1, by the process combination of nanofiltration and material film system, make the nanofiltration system rate of recovery reach 95%;
2, the concentrated solution of nanofiltration system can return to biochemical system, and does not affect its operation, and nanofiltration system is arranged outward without concentrating spent liquor;
3,, by the process combination of reverse osmosis and high-pressure membrane, make the rate of recovery of this part reach 90%;
4, adopt membrane process from percolate, to extract humic acids liquid fertile, and reach the standard of the Ministry of Agriculture's (standard No.), can be used as fertilizer or composting raw material and use, turn waste into wealth;
The present invention has realized film system concentrated solution recycling, and the recycle of nanofiltration dope, has reduced dope amount, improves the water rate of recovery.The total water rate of recovery of the present invention is nearly 90%, and the rate of recovery has improved more than 24% than traditional technology.Recycle-water water quality reaches " reuse of wastewater engineering design specification " (GB50335-2002) middle circulating cooling water quality standard, can be widely used.
Brief description of the drawings
Accompanying drawing 1 is process flow sheet of the present invention.
Accompanying drawing 2 is specific equipment figure of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, a kind of percolate advanced treatment process, it comprises following step: the water outlet first percolate being obtained through MBR system is carried out one-level nanofiltration processing and obtained one-level nanofiltration product water and concentrated solution; Then the product water obtaining through one-level nanofiltration processing is carried out to reverse-osmosis treated, concentrated solution carries out the one-level that one-level membrane separation obtains and sees through liquid and one-level concentrated solution, the product water reuse obtaining through reverse-osmosis treated, concentrated solution carries out high pressure recycling, then the one-level obtaining in second step is seen through to liquid and carry out secondary nanofiltration processing, one-level concentrated solution carries out secondary membrane separation and obtains secondary through liquid and secondary concentrated solution; Finally the secondary obtaining in the 3rd step is seen through to liquid and proceed one-level membrane separation, secondary concentrated solution as fertilizer sources uses.Wherein, described in, carry out one-level membrane separation and secondary membrane separation process and comprise pre-treatment and two stages of membrane separation.
In order to realize above-mentioned technique, as shown in Figure 2, design a kind of the first embodiment of percolate advanced treatment process specific equipment, it comprises nanofiltration raw water box 1, nanofiltration raw water box 1 output terminal is connected with one-level nanofiltration membrane component 2, on nanofiltration raw water box 1 and one-level nanofiltration membrane component 2 connecting pipelines, one-level nanofiltration water pump 3 is housed successively, accurate filter 4 and high-pressure pump 5, the liquid outlet that sees through of one-level nanofiltration membrane component 2 is connected to reverse osmosis raw water box 6, concentrated solution outlet is connected to material film system raw water box 7, material film system raw water box 7 exit end are connected to one-level pretreatment system 8, on material film system raw water box 7 and one-level pretreatment system 8 connecting pipelines, one-level water pump 9 is housed, one-level pretreatment system 8 output terminals are connected with a stage material membrane module 10, on one-level pretreatment system 8 and stage material membrane module 10 connecting pipelines, one-level accurate filter 11 and one-level high-pressure pump 12 are housed successively, the liquid outlet that sees through of one stage material membrane module 10 is connected to the middle water tank 13 that produces, dense water tank 14 in the middle of concentrated solution outlet is connected to,
Middle water tank 13 exit end that produce are connected to secondary nanofiltration membrane component 15, middle producing on water tank 13 and secondary nanofiltration membrane component 15 connecting pipelines is equipped with secondary nanofiltration water pump 16, secondary nanofiltration accurate filter 17 and secondary nanofiltration high-pressure pump 18 successively, the product water out of secondary nanofiltration membrane component 15 connects back reverse osmosis raw water box 6, and concentrated solution takes back the reuse of refuse biochemical system.
Middle dense water tank 14 outlets are connected to secondary pretreatment system 20, on middle dense water tank 14 and secondary pretreatment system 20 connecting pipelines, secondary water pump 21 is housed, secondary pretreatment system 20 output terminals are connected with two stage material membrane modules 22, on secondary pretreatment system 20 and two stage material membrane module 22 connecting pipelines, secondary accurate filter 23 and secondary high-pressure pump 24 are housed successively, two stage material membrane modules 22 produce water out and connect back material film system raw water box 7, two stage material membrane module 22 concentrated solution outlets connection collection boxes 19.
Described reverse osmosis raw water box 6 water sides are connected to reverse osmosis membrane assembly 25, on reverse osmosis raw water box 6 and reverse osmosis membrane assembly 25 connecting pipelines, feed water by reverse osmosis pump 26 is housed successively, reverse osmosis accurate filter 27 and reverse osmosis high-pressure pump 28, reverse osmosis membrane assembly 25 produces water out and connects product water reuse case, reverse osmosis membrane assembly 25 concentrated solution outlets are connected to concentrated solution pretreatment system 29, concentrated solution pretreatment system 29 exit end are connected to high-pressure membrane system raw water box 30, high-pressure membrane system raw water box 30 exit end are connected to high-pressure membrane assembly 31, on high-pressure membrane system raw water box 30 and high-pressure membrane assembly 31 connecting pipelines, high-pressure membrane intake pump 32 is housed successively, high-pressure membrane accurate filter 33 and high-pressure membrane high-pressure pump 34, high-pressure membrane assembly 31 concentrated solution outlets are equipped with high level salt solution collection box, see through liquid and be connected to product water reuse case.
Wherein, in described one-level nanofiltration membrane component 2, secondary nanofiltration membrane component 15, a stage material membrane module 10, two stage material membrane modules 22, reverse osmosis membrane assembly 25, high-pressure membrane assembly 31, water circulating pump is housed.
Working process of the present invention is to enter nanofiltration raw water box 1 after MBR system filtrate is adjusted water quality, after one-level nanofiltration treatment system is processed, produces dope and sees through liquid; See through liquid and enter reverse osmosis raw water box 6, concentrated solution enters material film system raw water box 7, after pre-treatment, carry out one-level membrane separation and obtain one-level product water and one-level concentrated solution, in the middle of entering, produces in the product water producing water tank 13, dense water tank 14 in the middle of concentrated solution enters, the middle water tank 13 that produces provides stable source of water for two sections of nanofiltration membrane systems, and the secondary that one-level concentrated solution produces after secondary membrane separation sees through liquid and enters material film system raw water box 7, and the secondary concentrated solution obtaining can be used as fertilizer; The reverse osmosis that the product water of reverse osmosis raw water box 6 produces after reverse osmosis system is processed sees through liquid reuse, and the concentrated solution of generation enters the processing of high-pressure membrane treatment system, and the concentrated solution of generation is high salt concentrated solution, can be for evaporative crystallization salt manufacturing, and seeing through liquid can reuse;
The second of this specific equipment is preferred embodiment all to connect film cleaning system at the two ends of described one-level nanofiltration membrane component 2, secondary nanofiltration membrane component 15, a stage material membrane module 10, two stage material membrane modules 22, reverse osmosis membrane assembly 25, high-pressure membrane assembly 31, in the time of the degradation of film, film is cleaned, recovered the performance of film.
The technique effect that the present invention has is:
First, film system concentrated solution recycling, the present invention adopts material recovering system to carry out separating concentrated to organic raw material, the dope humic acids content producing is greater than 3%, reach the national Ministry of Agriculture " containing humic acid water-soluble fertilizer standard " (NY1106-2010), can serve as organic fertilizer and composting raw material completely and use.In addition, this fertilizer is produced by biological respinse, and its fertilizer efficiency is very good, has more using value.
Secondly, nanofiltration dope obtains recycle, and nanofiltration dope of the present invention through material film system by humic acids separation and Extraction out, significantly reduces after the organic content of bio-refractory, then returns to biochemical system.Therefore, in biochemical system, can not cause the accumulation of hardly degraded organic substance.Heavy metal ion residual in dope can be removed in the acidifying of biochemical treatment and anaerobism segment process, also can not accumulate.And nanofiltration concentrated solution returns after biochemical system, do not need otherwise processed, significantly reduce the amount of concentrated solution.
Then reduce dope amount, improve the water rate of recovery, the present invention has reduced concentrated liquid measure, and has carried out recycling, and wherein the partially recycled rate of nanofiltration reaches 95%, and reverse osmosis part reaches 90%.After the dense water extraction fertilizer of nanofiltration, return to biochemical system, make nanofiltration part substantially not have concentrated solution to arrange outward, the overall water rate of recovery approaches 100%; Whole system only has the processing of need to dissolving of the concentrated solution of reverse osmosis, and concentrated liquid measure only has 10%, has reduced more than 2/3 than traditional technology.
Therefore, the total water rate of recovery of the present invention is nearly 90%, and the rate of recovery has improved more than 24% than traditional technology.Recycle-water water quality reaches " reuse of wastewater engineering design specification " (GB50335-2002) middle circulating cooling water quality standard, can be widely used.
Claims (6)
1. a percolate advanced treatment process, is characterized in that, it comprises following step:
(I) water outlet percolate being obtained through MBR system is carried out one-level nanofiltration processing and is obtained one-level nanofiltration product water and concentrated solution;
(II) then the product water obtaining through one-level nanofiltration processing is carried out to reverse-osmosis treated, concentrated solution carries out the one-level that one-level membrane separation obtains and sees through liquid and one-level concentrated solution;
(III) then the one-level obtaining in step (II) is seen through to liquid and carry out secondary nanofiltration processing, one-level concentrated solution carries out secondary membrane separation and obtains secondary through liquid and secondary concentrated solution;
(V) secondary obtaining in step (III) is seen through to liquid and proceed one-level membrane separation, secondary concentrated solution as fertilizer sources uses.
2. a kind of percolate advanced treatment process as claimed in claim 1, is characterized in that: by the product water reuse obtaining through reverse-osmosis treated in described step (II), concentrated solution carries out high pressure recycling.
3. a kind of percolate advanced treatment process as claimed in claim 1, is characterized in that: described in carry out one-level membrane separation and secondary membrane separation process comprises pre-treatment and two stages of membrane separation.
4. the specific equipment of a percolate advanced treatment process, it is characterized in that: it comprises nanofiltration raw water box (1), nanofiltration raw water box (1) output terminal is connected with one-level nanofiltration membrane component (2), on nanofiltration raw water box (1) and one-level nanofiltration membrane component (2) connecting pipeline, one-level nanofiltration water pump (3) is housed successively, accurate filter (4) and high-pressure pump (5), the liquid outlet that sees through of one-level nanofiltration membrane component (2) is connected to reverse osmosis raw water box (6), concentrated solution outlet is connected to material film system raw water box (7), material film system raw water box (7) exit end is connected to one-level pretreatment system (8), on material film system raw water box (7) and one-level pretreatment system (8) connecting pipeline, one-level water pump (9) is housed, one-level pretreatment system (8) output terminal is connected with a stage material membrane module (10), on one-level pretreatment system (8) and stage material membrane module (10) connecting pipeline, one-level accurate filter (11) and one-level high-pressure pump (12) are housed successively, the liquid outlet that sees through of one stage material membrane module (10) is connected to the middle water tank (13) that produces, dense water tank (14) in the middle of concentrated solution outlet is connected to,
Middle water tank (13) exit end that produces is connected to secondary nanofiltration membrane component (15), middle producing on water tank (13) and secondary nanofiltration membrane component (15) connecting pipeline is equipped with secondary nanofiltration water pump (16), secondary nanofiltration accurate filter (17) and secondary nanofiltration high-pressure pump (18) successively, the product water out of secondary nanofiltration membrane component (15) connects back reverse osmosis raw water box (6), and concentrated solution takes back the reuse of refuse biochemical system;
Middle dense water tank (14) outlet is connected to secondary pretreatment system (20), on middle dense water tank (14) and secondary pretreatment system (20) connecting pipeline, secondary water pump (21) is housed, secondary pretreatment system (20) output terminal is connected with two stage material membrane modules (22), on secondary pretreatment system (20) and two stage material membrane module (22) connecting pipelines, secondary accurate filter (23) and secondary high-pressure pump (24) are housed successively, two stage material membrane modules (22) produce water out and connect back material film system raw water box (7), two stage material membrane module (22) concentrated solution outlets connect collection box (19),
Described reverse osmosis raw water box (6) water side is connected to reverse osmosis membrane assembly (25), on reverse osmosis raw water box (6) and reverse osmosis membrane assembly (25) connecting pipeline, feed water by reverse osmosis pump (26) is housed successively, reverse osmosis accurate filter (27) and reverse osmosis high-pressure pump (28), reverse osmosis membrane assembly (25) produces water out and is connected to product water reuse case, reverse osmosis membrane assembly (25) concentrated solution outlet is connected to concentrated solution pretreatment system (29), concentrated solution pretreatment system (29) exit end is connected to high-pressure membrane system raw water box (30), high-pressure membrane system raw water box (30) exit end is connected to high-pressure membrane assembly (31), on high-pressure membrane system raw water box (30) and high-pressure membrane assembly (31) connecting pipeline, high-pressure membrane intake pump (32) is housed successively, high-pressure membrane accurate filter (33) and high-pressure membrane high-pressure pump (34), high-pressure membrane assembly (31) concentrated solution outlet is equipped with high level salt solution collection box, see through liquid and be connected to product water reuse case.
5. the specific equipment of a kind of percolate advanced treatment process as claimed in claim 4, is characterized in that: described one-level nanofiltration membrane component (2), secondary nanofiltration membrane component (15), a stage material membrane module (10), two stage material membrane modules (22), reverse osmosis membrane assembly (25), high-pressure membrane assembly are equipped with water circulating pump in (31).
6. the specific equipment of a kind of percolate advanced treatment process as claimed in claim 4, is characterized in that: the two ends of described one-level nanofiltration membrane component (2), secondary nanofiltration membrane component (15), a stage material membrane module (10), two stage material membrane modules (22), reverse osmosis membrane assembly (25), high-pressure membrane assembly (31) are all connected to film cleaning system.
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| CN103627008A (en) * | 2013-11-06 | 2014-03-12 | 上海晶宇环境工程有限公司 | Technology and special device for extracting humic acids from landfill leachate |
| CN106448787B (en) * | 2014-01-09 | 2018-10-02 | 清华大学 | A kind of method and apparatus of Spent Radioactive water process |
| CN105461157A (en) * | 2014-09-09 | 2016-04-06 | 中国石油化工股份有限公司 | High-salinity high-organic-matter contentwastewater zero discharge method |
| CN104310659B (en) * | 2014-11-12 | 2016-06-01 | 福州大学 | Containing high density SO42-Percolate MBR+NF concentrated solution in humic acids process for separating and recovering |
| CN106077073A (en) * | 2016-06-27 | 2016-11-09 | 上海市环境工程设计科学研究院有限公司 | A kind of method of composite drug improvement beach saline-alkali soil |
| CN107349788A (en) * | 2017-07-06 | 2017-11-17 | 中核四0四有限公司 | A kind of method for concentration for the pure level uranyl nitrate solution of core |
| CN107398182A (en) * | 2017-09-13 | 2017-11-28 | 福州城建设计研究院有限公司 | One kind diafiltration concentrated liquor humic acid separating and reclaiming device and technique |
| CN110002633A (en) * | 2019-04-25 | 2019-07-12 | 成都硕特环保科技有限公司 | A kind for the treatment of process of landfill leachate |
| CN110386729A (en) * | 2019-08-01 | 2019-10-29 | 水发海若环境技术有限公司 | A kind of food waste percolate treatment process |
| CN111099697A (en) * | 2019-11-22 | 2020-05-05 | 南京万德斯环保科技股份有限公司 | Landfill leachate MBR effluent treatment system and method |
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