CN106365305A - Preparing method and application of ecological matrix particles for river water body enhanced nitrogen removal - Google Patents

Preparing method and application of ecological matrix particles for river water body enhanced nitrogen removal Download PDF

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Publication number
CN106365305A
CN106365305A CN201610929155.2A CN201610929155A CN106365305A CN 106365305 A CN106365305 A CN 106365305A CN 201610929155 A CN201610929155 A CN 201610929155A CN 106365305 A CN106365305 A CN 106365305A
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ecological
granule
water
ecological matrix
raw
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CN201610929155.2A
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CN106365305B (en
Inventor
于鲁冀
范鹏宇
张新民
李廷梅
程璐璐
张广毅
陈涛
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郑州大学环境技术咨询工程公司
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/10Packings; Fillings; Grids
    • C02F3/104Granular carriers
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/10Packings; Fillings; Grids
    • C02F3/105Characterized by the chemical composition
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F2003/001Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/38Organic compounds containing nitrogen
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention relates to a preparing method and application of ecological matrix particles for river water body enhanced nitrogen removal. The problems that C/N of a river water body is low, a carbon source capable of being used by microorganisms is insufficient, the denitrification effect is inhibited, and the TN removal rate is small can be effectively solved. Corncob powder is smashed, added into a sodium hydroxide solution to be soaked, dried, irradiated by ultraviolet light to obtain modified corncob; a high-permeability porous inorganic material, an inorganic binder and the modified corncob are stirred to be mixed uniformly and pelleted; the prepared spherical particles are laid on a flat plate, placed in a shady and cool place, cured, and sprayed with water in the morning and evening every day until particle surfaces are moist, curing is completed, and the ecological matrix particles can be obtained through airing. The ecological matrix particles can be used as matrix filler in riverway in-situ/heterotopias recovery technology of an ecological floating bed, an ecological filtering dam, an ecological percolation island, an ecological revetment, a constructed wetland, an ecological filter tank, an ecological filter bed and the like. The ecological matrix particles are rich in raw material, easy to produce and prepare, low in cost, good in use effect, long in service life, huge in economic and social benefit.

Description

A kind of preparation method of ecological matrix granule of river water strengthened denitrification and application
Technical field
The present invention relates to Water Ecological Recovery Material Field, particularly a kind of ecological matrix granule of river water strengthened denitrification Preparation method and application.
Background technology
River ecosystem is one of most important ecosystem of nature, with human health, social development and economic increasing Length is closely bound up.Develop rapidly with economic, quality of water environment problem occurs frequently although current river water cod and ammonia nitrogen Pollution level is greatly reduced, but the pollution problem of the nutritive salt such as nitrogen, phosphorus increasingly highlights.And, river water is dirty Dye Con trolling index lacks the monitoring to total nitrogen, and receiving water body eutrophication trend is increasingly severe.With Ecological Civilization Construction Deepen continuously, clearly propose in national " water prevention and cure of pollution action plan ", " select there be the total of prominent impact to quality of water environment The indexs such as nitrogen, total phosphorus, basin, regional pollution thing prediction emission the binding indicator system are included in research ".This explanation continue cod, After ammonia nitrogen, we also should increasingly focus on total nitrogen index.
In river the approach of the removal of nitrogen include plant absorption and microbial degradation etc. effect, wherein microorganism nitrification, Denitrification is main approach.And the northern area of China majority river feeds runoff mainly by sewage plant tail water, river is dirty Footpath ratio is high, and water body c/n is relatively low, and biodegradability is poor, and the available carbon source of microorganism is not enough, and Denitrification is suppressed, and nitrogen follows Ring is obstructed.
Not enough for solving the problems, such as carbon source, conventional method is to add carbon source, but conventional carbon source additive is The carbon source that glucide (as glucose, Fructose etc.) and methanol, acetic acid etc. are easily biodegradable.But there is dosage in traditional carbon source It is difficult to control to, holds time short, the problems such as add high cost.Therefore, draw materials conveniently, source sufficient, with low cost, can long-acting release The cellulose family carbon source of carbon becomes the substitute products of traditional carbon source.Have some achievements at present to achieve in actual applications substantially Effect: number of patent application be 201410041339.6, patent name is for polluted underground water biochemistry combine d bioremediation Composite functional material and preparation method thereof, the composite functional material described in this application case includes kernel, material packed layer and outer Shell three-decker, wherein kernel are released material with carbon element for wooden unit, straw etc. and can slowly be discharged carbon source, provide electronics to be subject to for denitrifying bacterium Body, Denitrification intensity significantly improves.This materials application, in permeable reactive wall and groundwater remediation well, achieves good Denitrification effect.But, the functional material granule described in this application case be only capable of keeping in water 2~4 weeks not broken, granule strength still has To be modified, and current application only in terms of groundwater remediation for the cellulose carbon source has been reported, in artificial swamp, bacteria bed Not yet it is applied with water course in situ recovery technique.
Content of the invention
For above-mentioned situation, for overcoming the deficiency of prior art, the purpose of the present invention is exactly to provide a kind of river water strong Change the preparation method of ecological matrix granule of denitrogenation and application, can effectively solving river water c/n relatively low, microorganism is available Carbon source is not enough, and Denitrification is suppressed, the relatively low problem of tn clearance.
The technical scheme that the present invention solves is to comprise the following steps:
(1), dispensing:
Ecological matrix granule is made up of the raw material of following weight meter: high osmosis porous inorganic material 50%~75%, inorganic knot Close material 20%~25% and slow release carbon source 3%~5%;
Described high osmosis porous inorganic material is: 2 kinds or 3 kinds of mixing in kieselguhr, calcium-base bentonite or zeolite powder Thing;
Described inorganic binder is one kind of Portland cement, flyash or portland slag cement, or two kinds mixed Compound;
Described slow release carbon source is corn cob;
(2) corn cob is modified: maize cob meal was broken into the granule of 40-60 mesh sieve, and added the sodium hydroxide of mass concentration 2% molten Liquid, soaks 2-4h, and it is neutral for being rinsed to ph with clear water, dries, ultraviolet light 10h, obtains modified corn core (granule);
(3) pelletize: high osmosis porous inorganic material, inorganic binder and modified corn core are uniformly mixed, insert and make Grain machine pelletize, in 20~25r/min, sprays water into comminutor, makes raw material gradually roll into the spheroidal particle of diameter 9-12mm;
(4) maintenance: the spheroidal particle making is laid on flat board, In Shade, maintenance 3-5 days, daily sooner or later each watering Once, sprinkle water and moisten to particle surface, maintenance completes, and dries, that is, obtain ecological matrix granule.
The ecological matrix granule of the inventive method preparation can be refuted as biological floating bed, ecological filter dam, ecological diafiltration island, ecology Matrix fill application in bank, artificial swamp, ecological filter, the water course in situ/showering technology such as ecological filter bed.
Abundant raw material of the present invention, easily produces preparation, low cost, using effect is good, the kieselguhr of use, calcium-base bentonite and The high osmosis porous inorganic material such as zeolite powder is respectively provided with loose structure, and specific surface area is big, mass transfer performances are good, using these material systems The ecological matrix granule made can make slow release carbon source extractum smoothly discharge;Portland cement/portland slag cement is made Granule strength can be made to reach 200-300n for inorganic binder, ecological matrix granule can be steady in gently stable hydraulics Surely keep more than half a year not crushing, life-span length, economic and social benefit is huge.
Brief description
Fig. 1 is ecological matrix granule Inlet and outlet water total nitrogen concentration scattergram of the present invention.
Specific embodiment
With reference to embodiments the specific embodiment of the present invention is elaborated.
Embodiment 1
The present invention, in being embodied as, comprises the following steps:
(1), dispensing:
Ecological matrix granule is made up of the raw material of following weight meter: corn cob 5%, kieselguhr 20%, calcium-base bentonite 20%, boiling Stone powder 35% and portland slag cement 20%;
(2), corn cob is modified: maize cob meal was broken into the granule of 40-60 mesh sieve, and added the sodium hydroxide of mass concentration 2% molten Liquid, it is neutral for being rinsed to ph with clear water after soaking 2h, dries, ultraviolet light 10h, obtain modified corn core in 60 DEG C of baking ovens (granule);
(3) pelletize: kieselguhr, calcium-base bentonite, zeolite powder, portland slag cement and modified corn core are stirred using blender Mix mix homogeneously, insert round pot granulator granulation, under 20~25r/min rotating speed, constantly sprayed into comminutor using aerosol apparatus Watering mist, makes raw material gradually roll into the spheroidal particle of diameter 9-12mm;
(4) maintenance: granule is taken out and is laid on flat board and is positioned over shady place, the daily morning and evening respectively sprinkles water maintenance once, watering Moisten to particle surface, maintenance is dried after 3-5 days and obtained ecological matrix granule.Through testing and measuring, wherein:
Release carbon effect:
After measured, this ecological matrix granule strength reaches more than 280n, and ecological matrix granule is invested in reactor, throws in body Amass 1/8 for reactor volume, intake as distilled water, under conditions of hydraulic detention time is for 12h, ecological matrix granule is slow Release carbon source, water outlet cod is 18~25mg/l, releases the carbon half-life and has slow release carbon ecological matrix granule more than half a year, is described The function in source, releases carbon cycle length and granule strength is high;
Denitrification effect:
Ecological matrix granule is invested in reactor, volume dosed is the 1/8 of reactor volume, and common gravel base is loaded in setting The matched group of matter, intakes as polluted river water, and water inlet total nitrogen (tn) concentration is 34~54mg/l, from accompanying drawing 1, stops in waterpower Under conditions of staying the time to be 12h, device water outlet tn concentration is 14~20mg/l, and tn clearance reaches more than 60%, compared to comparison Group, clearance is significantly increased,.
Embodiment 2
The present invention, in being embodied as, comprises the following steps:
(1), dispensing:
Ecological matrix granule is made up of the raw material of following weight meter: corn cob 4%, kieselguhr 19%, calcium-base bentonite 19%, boiling Stone powder 33%, Portland cement 12% and flyash 13%;
(2), corn cob is modified: maize cob meal was broken into the granule of 40-60 mesh sieve, and added the sodium hydroxide of mass concentration 2% molten Liquid, soaks 2h, and it is neutral for being rinsed to ph with clear water, dries, ultraviolet light 10h in 60 DEG C of baking ovens, obtain modified corn core ( Grain);
(3) pelletize: kieselguhr, calcium-base bentonite, zeolite powder, Portland cement, flyash and modified corn core are stirred Mix homogeneously, inserts round pot granulator granulation, under 20~25r/min rotating speed, is constantly sprayed into comminutor using aerosol apparatus Water smoke, makes raw material gradually roll into the spheroidal particle of diameter 9-12mm;
(4) maintenance: granule is taken out and is laid on flat board and is positioned over shady place, the daily morning and evening respectively sprinkles water maintenance once, watering Moisten to particle surface, maintenance is dried after 3-5 days and obtained ecological matrix granule.
Through testing and measuring, this granule strength reaches 233n, ecological matrix granule is invested in lab scale reactor, throws in Volume is the 1/8 of reactor volume, intakes as distilled water, and under conditions of hydraulic detention time is for 12h, ecological matrix granule delays On The Drug Release carbon source, water outlet cod is 16~29mg/l, releases the carbon half-life more than half a year, this ecological matrix granule has slow release carbon The function in source, releases carbon cycle length and granule strength is high, meanwhile, so that granule cost is entered using coal ash instead part portland cement One step reduces..
Embodiment 3
Described dispensing, also can be made up of the raw material of following weight meter: corn cob 3%, kieselguhr 30%, zeolite powder 35%, slag silicon Acid salt cement 11% and flyash 11%, preparation method is with embodiment 1.
Embodiment 4
Described dispensing, also can be made up of the raw material of following weight meter: corn cob 5%, calcium-base bentonite 38%, zeolite powder 37%, ore deposit Slag portland cement 10% and Portland cement 10%, preparation method is with embodiment 1.
Embodiment 5
Described dispensing, also can be made up of the raw material of following weight meter: corn cob 3%, calcium-base bentonite 37%, kieselguhr 36% and Portland slag cement 24%, preparation method is with embodiment 1.
The experimental conditions of embodiment 3-5 are similar with embodiment 1,2.
Modified corn core slow release carbon source included in ecological matrix granule of the present invention constantly discharges in water body, can be obvious Improving water body c/n ratio, providing biochemical good carbon source for heterotrophic denitrifier, thus improving ecological reestablishment to water The removal effect of body total nitrogen.This ecological matrix granule has granule strength height, slowly discharges carbon source, nontoxic, can carry rapidly High Denitrification speed, efficiently removes total nitrogen.
Show that inventive formulation is scientific and reasonable, preparation method is reliable and stable, compared with prior art, have following outstanding Advantageous Effects:
(1) present invention is used cement and flyash as inorganic binder, and ecological matrix granule has very stiff stability and with height Intensity, granule strength reaches 200-300n, more currently reported groundwater remediation granular materialss intensity improve 2 times with On, long service life is so as to artificial swamp, bacteria bed and water course in situ can be applied to as a kind of permanent substrate or dystopy is repaiied In recovering technology;
(2) corn cob carbon source is soaked+uv by 2%naoh and is irradiated modification, makes the molecular scission of lignin in corn cob, coloured Material dissolution, solves the shortcomings of natural corn core carbon source is released that carbon is unstable, releases carbon cycle is short, effluent color dilution is higher, improves The release efficiency of cellulose and deenergized period in corn cob, it is more beneficial for denitrifying microorganism and absorbs, improve denitrification and make With efficiency, nitrogen removal rate reaches more than 60%;
(3) material that this invention uses is natural organic carbon source and natural inorganic material, no chemosynthesis composition, low cost, no Pollution, compared to the method using liquid carbon source such as conventional methanol, sodium acetates, can reduce by more than 50% using cost of the present invention, can Former as biological floating bed, ecological filter dam, ecological diafiltration island, ecological revetment, artificial swamp, ecological filter, the river course such as ecological filter bed Matrix fill in position/showering technology, has high popularization in artificial swamp, bacteria bed and water course in situ reparation Using value.

Claims (7)

1. a kind of preparation method of the ecological matrix granule of river water strengthened denitrification is it is characterised in that comprise the following steps:
(1) dispensing:
Ecological matrix granule is made up of the raw material of following weight meter: high osmosis porous inorganic material 50%~75%, inorganic knot Close material 20%~25% and slow release carbon source 3%~5%;
Described high osmosis porous inorganic material is: 2 kinds or 3 kinds of mixing in kieselguhr, calcium-base bentonite or zeolite powder Thing;
Described inorganic binder is one kind of Portland cement, flyash or portland slag cement, or two kinds mixed Compound;
Described slow release carbon source is corn cob;
(2) corn cob is modified: maize cob meal was broken into the granule of 40-60 mesh sieve, and added the sodium hydroxide of mass concentration 2% molten Liquid, soaks 2-4h, and it is neutral for being rinsed to ph with clear water, dries, ultraviolet light 10h, obtain modified corn core in 60 DEG C of baking ovens;
(3) pelletize: high osmosis porous inorganic material, inorganic binder and modified corn core are used blender stirring mixing all Even, insert granulator granulation, in 20~25r/min, spray water into comminutor, make raw material gradually roll into the ball of diameter 9-12mm Shape granule;
(4) maintenance: the spheroidal particle making is laid on flat board, In Shade, maintenance 3-5 days, daily sooner or later each watering Once, sprinkle water to particle surface moisten, dry, ecological matrix granule.
2. the ecological matrix granule of river water strengthened denitrification according to claim 1 preparation method it is characterised in that Comprise the following steps:
(1) dispensing:
Ecological matrix granule is made up of the raw material of following weight meter: corn cob 5%, kieselguhr 20%, calcium-base bentonite 20%, boiling Stone powder 35% and portland slag cement 20%;
(2) corn cob is modified: maize cob meal was broken into the granule of 40-60 mesh sieve, and added the sodium hydroxide of mass concentration 2% molten Liquid, soaks 2h, and it is neutral for being rinsed to ph with clear water, dries, ultraviolet light 10h, obtain modified corn core in 60 DEG C of baking ovens;
(3) pelletize: kieselguhr, calcium-base bentonite, zeolite powder, portland slag cement and modified corn core are stirred using blender Mix mix homogeneously, insert round pot granulator granulation, under 20~25r/min rotating speed, constantly sprayed into comminutor using aerosol apparatus Watering mist, makes raw material gradually roll into the spheroidal particle of diameter 9-12mm;
(4) maintenance: granule is taken out and is laid on flat board and is positioned over shady place, the daily morning and evening respectively sprinkles water maintenance once, watering Moisten to particle surface, maintenance is dried after 3-5 days and obtained ecological matrix granule.
3. the ecological matrix granule of river water strengthened denitrification according to claim 1 preparation method it is characterised in that Comprise the following steps:
(1) dispensing:
Ecological matrix granule is made up of the raw material of following weight meter: corn cob 4%, kieselguhr 19%, calcium-base bentonite 19%, boiling Stone powder 33%, Portland cement 12% and flyash 13%;
(2) corn cob is modified: maize cob meal was broken into the granule of 40-60 mesh sieve, and added the sodium hydroxide of mass concentration 2% molten Liquid, soaks 2-4h, and it is neutral for being rinsed to ph with clear water, dries, ultraviolet light 10h, obtain modified corn core in 60 DEG C of baking ovens;
(3) pelletize: kieselguhr, calcium-base bentonite, zeolite powder, Portland cement, flyash and modified corn core are stirred Mix homogeneously, inserts round pot granulator granulation, under 20~25r/min rotating speed, is constantly sprayed into comminutor using aerosol apparatus Water smoke, makes raw material gradually roll into the spheroidal particle of diameter 9-12mm;
(4) maintenance: granule is taken out and is laid on flat board and is positioned over shady place, the daily morning and evening respectively sprinkles water maintenance once, watering Moisten to particle surface, maintenance is dried after 3-5 days and obtained ecological matrix granule.
4. the ecological matrix granule of river water strengthened denitrification according to claim 1 preparation method it is characterised in that Described dispensing, is made up of the raw material of following weight meter: corn cob 3%, kieselguhr 30%, zeolite powder 35%, portland slag cement 11% and flyash 11%, preparation method is with claim 1.
5. the ecological matrix granule of river water strengthened denitrification according to claim 1 preparation method it is characterised in that It is made up of the raw material of following weight meter: corn cob 5%, calcium-base bentonite 38%, zeolite powder 37%, portland slag cement 10% and general Logical portland cement 10%, preparation method is with claim 1.
6. the ecological matrix granule of river water strengthened denitrification according to claim 1 preparation method it is characterised in that It is made up of the raw material of following weight meter: corn cob 3%, calcium-base bentonite 37%, kieselguhr 36% and portland slag cement 24%, system Preparation Method is with claim 1.
7. the ecological matrix granule of claim 1 methods described preparation is in biological floating bed, ecological filter dam, ecological diafiltration island, ecology Application in revetment, artificial swamp, ecological filter, the matrix fill of ecological filter bed water course in situ/showering.
CN201610929155.2A 2016-10-31 2016-10-31 A kind of preparation method and application of the ecological matrix particle of river water strengthened denitrification CN106365305B (en)

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CN107522293A (en) * 2017-10-16 2017-12-29 郑州大学 It is a kind of based on denitrification organisms microcapsules and the ecological purified water preparation method of granules of slow release carbon source
CN107698020A (en) * 2017-09-27 2018-02-16 河海大学 A kind of biomass solid carbon source haydite and its preparation method and application
CN107746102A (en) * 2017-11-27 2018-03-02 中国水产科学研究院渔业机械仪器研究所 A kind of high efficient biological purifying filter block
CN107792946A (en) * 2017-12-05 2018-03-13 郑州大学 Solid shore spats component of vegetation type for micro- polluted river strengthened denitrification and preparation method thereof
CN108046409A (en) * 2017-11-15 2018-05-18 同济大学 A kind of quick startup function carbon source filler of double immobilizations and preparation method thereof
CN108939632A (en) * 2018-08-08 2018-12-07 江苏澳洋生态园林股份有限公司 Purification and irrigation rig suitable for landscape water body and its land use for greening
CN108975835A (en) * 2018-08-17 2018-12-11 郑州大学 A kind of preparation method and applications of the composite adsorption stuffing containing slow release carbon source
CN108996668A (en) * 2018-06-27 2018-12-14 江苏龙腾工程设计股份有限公司 A kind of high-efficiency sustained-release carbon source modified corn core, preparation method and application
CN110295572A (en) * 2019-07-08 2019-10-01 郑州大学 A kind of preposition detachable back washing anti-blocking plug ecology filter dam

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CN102311253A (en) * 2011-05-23 2012-01-11 合肥工业大学 Synchronous denitrification and dephosphorization bio-filter packing and preparation method thereof
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107698020A (en) * 2017-09-27 2018-02-16 河海大学 A kind of biomass solid carbon source haydite and its preparation method and application
CN107522293A (en) * 2017-10-16 2017-12-29 郑州大学 It is a kind of based on denitrification organisms microcapsules and the ecological purified water preparation method of granules of slow release carbon source
CN108046409A (en) * 2017-11-15 2018-05-18 同济大学 A kind of quick startup function carbon source filler of double immobilizations and preparation method thereof
CN107746102A (en) * 2017-11-27 2018-03-02 中国水产科学研究院渔业机械仪器研究所 A kind of high efficient biological purifying filter block
CN107792946A (en) * 2017-12-05 2018-03-13 郑州大学 Solid shore spats component of vegetation type for micro- polluted river strengthened denitrification and preparation method thereof
CN108996668A (en) * 2018-06-27 2018-12-14 江苏龙腾工程设计股份有限公司 A kind of high-efficiency sustained-release carbon source modified corn core, preparation method and application
CN108939632A (en) * 2018-08-08 2018-12-07 江苏澳洋生态园林股份有限公司 Purification and irrigation rig suitable for landscape water body and its land use for greening
CN108975835A (en) * 2018-08-17 2018-12-11 郑州大学 A kind of preparation method and applications of the composite adsorption stuffing containing slow release carbon source
CN110295572A (en) * 2019-07-08 2019-10-01 郑州大学 A kind of preposition detachable back washing anti-blocking plug ecology filter dam

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