CN207713502U - A kind of regeneration effluent process system - Google Patents
A kind of regeneration effluent process system Download PDFInfo
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- CN207713502U CN207713502U CN201721667212.0U CN201721667212U CN207713502U CN 207713502 U CN207713502 U CN 207713502U CN 201721667212 U CN201721667212 U CN 201721667212U CN 207713502 U CN207713502 U CN 207713502U
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Abstract
The utility model discloses a kind of regeneration effluent process systems.The system includes intake tunnel, exhalant canal, is equipped with the Improvement type sequencing batch reactor being serially connected successively between intake tunnel and exhalant canal（MSBR）, artificial swamp advanced sewage treatment system and disinfection canal；The first return duct is set between Improvement type sequencing batch reactor and intake tunnel, and the second return duct is set between artificial swamp advanced sewage treatment system and intake tunnel." MSBR+ artificial swamps " combined sewage water regeneration technology system provided by the utility model, have many advantages, such as that construction cost is low, operating cost is low, landscape effect is good, denitrogenation dephosphorizing is efficient, operation is flexible, stable and effluent quality is high, water outlet can reach the water standard of reclaimed water reuse, be the group technology that a kind of ideal ecological wastewater processing and regeneration are combined.
Description
Technical field
The utility model belongs to technical field of sewage, is related to a kind of regeneration effluent process system, and in particular to a kind of
" MSBR+ artificial swamps " combined sewage water regeneration technology system and its application.
Background technology
Current China faces that water pollution is serious, Ecology is fragile, the severe situation of shortage of water resources and water quality type water shortage, I
The many cities of state, especially north city, treated, and reuse of wastewater has become the master for ensureing urban water-body ecological basic flow
Want source, it is necessary to further advanced treatings for municipal sewage plant's secondary biochemical treatment tail water as reclaimed water reuse,《Water is dirty
Dye prevention action plan》The existing urban wastewater treatment facility adaptation to local conditions in China is distinctly claimed to carry out carrying mark transformation, the year two thousand twenty bottom
Before reach corresponding discharge standard or regeneration requirement；The city of IV class standard of surface water is not achieved in built-up areas water quality, newly
Level-one emission standard A will be executed by building urban wastewater treatment facility.During " 13 ", China increases sewage treatment facility scale newly
48900000 ton per days carry 40,530,000 ton per day of mark transformation sewage treatment facility scale, increase reclaimed wastewater reuse facility scale 21,130,000 newly
Ton per day.
Tri- kinds of widely used oxidation ditch in current China, SBR and AAO secondary biochemical treatment techniques have certain limitation
Property, the problems such as oxidation ditch process sludge age is partially long, and energy consumption is higher, is also easy to produce foam, and there is also flow velocity unevenness and sludgd depositions；SBR
Technique becomes water level intermittent duty, and energy consumption is higher, and sludge stabilization is poor, and Nitrogen/Phosphorus Removal is undesirable；The flow letter of AAO technology process
Single, running and comparing is stablized, but the lower sludge concentration of system cannot be satisfied while the requirement of high-efficiency biological nitrogen and phosphorus removal.By AAO
The Improvement type sequencing batch reactor being composed with SBR（MSBR）Technique has had both the advantages of AAO and SBR techniques, is not required to two
Heavy pond can realize that continuous flow and permanent water level are run, with floor space is small, construction cost is low, control is flexible, automation
The advantages that degree is high, energy consumption is relatively low, good denitrogenation and dephosphorization effect, is a kind of advanced sewage secondary biochemical treating process.
Municipal sewage plant of China proposes mark transformation frequently with the films skill such as ultrafiltration membrane, membrane bioreactor due to land used anxiety
Art, but since membrane technology does not have biological carbon and phosphorous removal function, also have the shortcomings that cost of investment height and operation expense are high,
Therefore membrane technology applies in general to carrying for land used anxiety sewage treatment plant and marks transformation.With artificial swamp ecological technique maturation and
Application, artificial swamp are considered a kind of sewerage advanced treatment process technology of great potential, have good denitrogenation and dephosphorization effect,
The advantages that process equipment is simple, adaptable to load variations, construction cost is low, operating cost is low, ecoscape is good.Therefore,
The advantages of " MSBR+ artificial swamps " sewage combination regeneration process system has had both MSBR and artificial swamp, low with construction cost,
Operating cost is low, landscape effect is good, denitrogenation dephosphorizing is efficient, operation is flexible, stable and effluent quality is high etc., and water outlet is reachable
To the water standard of reclaimed water reuse.The group technology had not only effectively realized the energy-saving and emission-reduction of sewage treatment plant, but also effectively solved
China's earth's surface natural water water shortage, eutrophication and it is black smelly the problems such as, be a kind of ideal ecological wastewater processing and regeneration
The process system being combined has broad application prospects in the novel Urbanization Construction in China.
Utility model content
The technical issues of the utility model solves is that most widely used AAO secondary biochemicals technique can not expire in the prior art
Foot simultaneously high-efficiency biological nitrogen and phosphorus removal requirement, film further treatment technique have construction cost height and operation expense it is high lack
Point.In view of the above-mentioned problems, the purpose of this utility model be to carry out sewage second-level biochemical treatment and advanced treatment process it is excellent
Change combination, provide a kind of construction cost is low, operating cost is low, landscape effect is good, denitrogenation dephosphorizing is efficient, operation is flexible, run
Stablize and high " MSBR+ artificial swamps " the combined sewage water regeneration technology system of effluent quality, water outlet can reach simultaneously《Town sewage
Treatment plant's pollutant emission standard》（GB18918-2002）Level-one emission standard A,《Urban sewage reutilization urban reclaimed water
Water quality》（GB/T18920-2002）With《Urban sewage reutilization landscape water water quality》（GB/T18921-2002）Standard.
The technical solution of the utility model is to provide a kind of regeneration effluent process system, including intake tunnel, water outlet lead to
Road is equipped with the Improvement type sequencing batch reactor being serially connected successively between intake tunnel and exhalant canal（MSBR）, it is artificial
Wetland advanced sewage treatment system and disinfection canal；The first reflux is set between Improvement type sequencing batch reactor and intake tunnel
Pipe, sets the second return duct between artificial swamp advanced sewage treatment system and intake tunnel.
Preferably, Improvement type sequencing batch reactor（MSBR）By anaerobic pond, anoxic pond, main aeration tank, pre- anoxic pond, mud
Multiple-unit integrated reactor made of water separation tank, two ponds SBR are co-walled.
Preferably, the artificial swamp advanced sewage treatment system is the multistage composite artificial swamp being serially connected, by water
Direction is flowed, includes the artificial swamp positioned at the aerobe pool of upstream and positioned at downstream per level-one combined artificial wetland.
Preferably, the multistage composite artificial swamp is three-level combined artificial wetland.
Preferably, in the artificial swamp of the first order combined artificial wetland, between each artificial wetland unit mutually simultaneously
Connection, and be vertical subsurface flow wetland unit；Other combined artificial wetlands at different levels in addition to first order combined artificial wetland
Artificial swamp in, artificial swamp includes the group of several artificial swamp units compositions being serially connected, between each group
It is parallel with one another；Artificial swamp unit in each group had not only included horizontal drowned flow artificial wet land unit, but also including surface person who lives in exile
Work wetland unit.
Preferably, multiple downflow weirs are set in the aerobe pool.
Preferably, in the artificial swamp of afterbody combined artificial wetland, the artificial swamp unit close to disinfection canal is water
Flat drowned flow artificial wet land unit.
Preferably, kind is implanted with water plant in the artificial swamp, the water plant be canna, reed,
One or both of cattail, yellow flag, calamus, thaliadeabata, Lythrum salicaria, rush, wild rice stem, cyperus alternifolius, vetiver, mullet grass
More than.
This " MSBR+ artificial swamps " the combined sewage water regeneration technology system of the utility model mainly passes through MSBR and people
Work wetland two subsystems are discharged after being handled.
MSBR is that a kind of improved SBR techniques pass through two by seven or the co-walled pond that is integrated of ten pool units
The symmetrical ponds SBR design is back to back water running to realize permanent water level.
The waterpower flow of MSBR is to enter MSBR anaerobic ponds through the pretreated sewage of the facilities such as grid, setting pot and come from
The returned sludge of pre- anoxic pond mixes, and the sludge rich in phosphorus carries out entering anoxic pond after releasing phosphorus reaction in anaerobic pond, in anoxic
The backflow mixed liquor that Chi Zhongyu comes autonomous aeration tank carries out denitrification denitrogenation, and anoxic pond mixed liquor, which enters back into main aeration tank, to be had
The degradation of machine object, nitrification, phosphorus enter the ponds SBR, two SBR pool unit alternate runs after absorbing.
The return-flow system of MSBR includes mixed-liquor return and sludge reflux, and mixed-liquor return is that mixed liquor returns in main aeration tank
It flows to and carries out denitrification denitrogenation in anoxic pond；Sludge reflux divides for the ponds SBR to be in the mixed-liquor return of reactiveness to muddy water
From pond, the supernatant after mud-water separation flows back into anoxic pond or main aeration tank, and thickened sludge is then through pre- anoxic pond endogenous denitrification
Nitrate is reduced to after 1.5mg/L or less and flows back into anaerobic pond again and fully releases phosphorus for anaerobism.
MSBR further includes a set of reflux line facility（That is the first return duct）, MSBR sequences are criticized by intermittent skimming operation
Pool unit floaters on surface flows back into the pretreatment before MSBR.
Artificial swamp advanced sewage treatment system is the multistage composite artificial swamp being serially connected, each by water (flow) direction
Grade combined artificial wetland includes positioned at the aerobe pool of upstream（The aerobe pool hereinafter referred to as biological pond）With positioned at downstream
Artificial swamp, each artificial swamp includes several artificial swamp units, sets multiple downflow weirs in biological pond.
Artificial swamp further includes a set of piping facility（That is the second return duct）, by carrying out intermittent emptying to piping facility
Operation realizes the gurney finishing of artificial swamp each unit and filler surface in artificial swamp unit is fallen off biomembrane with discharge water
Body flows back into the pretreatment before MSBR.
Preferably, reclaimed water reuse is used as after the combined artificial wetland water outlet is sterile-processed.
Compared with prior art, the beneficial effects of the utility model are：The utility model provides a kind of with adjacent profit
The combined sewage water regeneration technology system of the ecological sewage treatment factory of type, optimizes combination, especially by MSBR and artificial swamp
The optimum organization of biological pond, vertical subsurface flow wetland, free water surface wetland and horizontal subsurface flow wetland, realize town sewage efficiently it is low at
The processing of this deep purifying, recycling sewage generated by making and ecoscape build multi-functional.
Using the utility model " MSBR+ artificial swamps " combined sewage water regeneration technology system as urban wastewater treatment firm dirt
Water treatment technology, long term monitoring the result shows that：In the case of not additional carbon and chemical dephosphorization medicament, MSBR water outlets reach one
Grade B standard becomes, and excellent water is flat, and artificial wetland effluent is sterile-processed rear while reaching level-one A standards and urban sewage reutilization phase
Close Standard of reclaimed water.In short, the utility model energy is economical, stablizes, effectively by town domestic sewage deep purifying to city
City's reuse of wastewater correlative regeneration water water standard, high-efficiency biological nitrogen and phosphorus removal can not be met simultaneously by overcoming AAO techniques
It is required that with the disadvantage that film further treatment technique construction cost is high, operation expense is high, the life of urban wastewater treatment firm is improved
State landscape greatly improves urban wastewater treatment firm periphery land values.
Description of the drawings
Fig. 1 is " MSBR+ artificial swamps " combined sewage water regeneration technology system schematic of embodiment 1；
Fig. 2 is MSBR horizontal layout schematic diagrames；
Fig. 3 is three-level combined artificial wetland process system schematic diagram.
In figure, arrow indicates water (flow) direction, and 11 indicate inlet channel, and 22 indicate that outlet canal, T represent the aerobe pool, and T-1 is
The first order aerobe pool, T-2 are the second level aerobe pool, and T-3 is the third level aerobe pool；It is artificial that I represents the first order
Wetland, II represent second level artificial swamp, and III represents third level artificial swamp；Correspondingly, I-1, I-2, I-3, I-4 indicate the
Four artificial wetland units in level-one artificial swamp；II-1, II -2, II-3, II-4 indicate four in the artificial swamp of the second level
A artificial wetland unit；III-1, III-2, III-3, III-4 indicate four artificial wetland units in third level artificial swamp.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.
Embodiment
As shown in Figure 1, " MSBR+ artificial swamps " combined sewage water regeneration technology system of the present embodiment include intake tunnel and
Exhalant canal is sequentially connected in series Improvement type sequencing batch reactor, multistage composite Manual moist between intake tunnel and exhalant canal
Ground, disinfection canal, wherein Improvement type sequencing batch reactor, multistage composite artificial swamp pass through the first return duct and second time respectively
Flow tube is connected with intake tunnel.
The method of operation is：Sewage is introduced into MSBR and carries out secondary biochemical treatment, and secondary biochemical treatment tail water subsequently enters more
Grade combined artificial wetland, the physics for the complex ecosystem that filler, water plant, microorganism and water body form in wetland are changed
It learns, further deep purifying processing under the multiple synergistic effect of biology, is returned as recycled water after artificial wetland effluent is sterile-processed
With.
As shown in Fig. 2, MSBR be it is artificial build steel reinforced concrete pool, by seven pool units it is co-walled made of integral structure
Pond, including anaerobic pond（4#）, anoxic pond（5#）, main aeration tank（6#）, pre- anoxic pond（3#）, mud-water separation pond（2#）, the ponds SBR
（1#、7#）Seven pool units.Sewage after pretreatment is directly entered 4# anaerobic ponds and the returned sludge from the pre- anoxic ponds of 3#
Mixing, the sludge rich in phosphorus carries out entering 5# anoxic ponds after releasing phosphorus reaction in 4# anaerobic ponds, in 5# anoxic ponds and from 6#
The backflow mixed liquor of main aeration tank carries out denitrification denitrogenation, and 5# anoxic pond mixed liquors enter back into the main aeration tanks 6# and carry out organic matter drop
Solution, nitrification, phosphorus enter the ponds 1# or 7# SBR, two SBR pool unit alternate runs after absorbing.When the ponds 1# or 7#SBR are in anoxic
Or when aerobic reaction state, the ponds 1# or 7#SBR mud mixed liquid is flowed back into 2# mud-water separations by the ponds 1# or 7#SBR sludge reflux pump
Pond, the supernatant after mud-water separation flow back into 5# anoxic ponds or the main aeration tanks 6#, and thickened sludge is then flowed back into through the pre- anoxic ponds of 3#
4# anaerobic ponds.When the ponds 1# or 7#SBR are in out water state, the ponds 1# or 7#SBR excess sludge spoil disposal pump operation is by excess sludge
It is discharged into sludge dewatering system.
As shown in figure 3, multistage composite artificial swamp includes sequentially connected inlet channel 11, the compound people of three-level by water (flow) direction
Work wetland, outlet canal 22, three-level combined artificial wetland（Or three-level subsystem）From the low arrangement of height, three-level subsystem includes
The aerobe pool and artificial swamp.Aerobe pool bottom and artificial swamp peripheral wall, bottom are equipped with impervious barrier, and peripheral wall is laid with
Impervious barrier be two cloth, one film geomembrane anti-seepage layer, bottom be laid with impervious barrier by two cloth, one film geomembrane and be located at antiseepage
The coarse sand protective layer of film upper and lower forms.Water inlet initially enters first order biological pond（T-1）, the is collected using two articles of distributing channels
The artificial swamp that level-one biological pond is discharged and utilizes distributing pipe line to first order vertical subsurface flow（I-1, I-1, I-2, I-3 and I-4）
Water distribution collects first order vertical subsurface flow wetland using braiding channel（I）Water outlet enters second level biological pond（T-2）, using with
Water channel collects second level biological pond（T-2）It is discharged and utilizes distributing pipe line to second level horizontal drowned flow artificial wet land（II-1、II-
2）Water distribution collects second level horizontal drowned flow artificial wet land using braiding channel（II-1、II-2）It is discharged and to second level surface person who lives in exile
Work wetland（II-3、II-4）Water distribution collects second level surface current artificial wetland using braiding channel（II-3、II-4）Water outlet enters the
Three-level biological pond（T-3）, third level biological pond is collected using distributing channel（T-3）It is discharged and utilizes distributing pipe line to third level surface
Artificial wetland（III-1、III-2）Water distribution collects third level surface current artificial wetland using braiding channel（III-1、III-2）Go out
Water and to third level horizontal drowned flow artificial wet land（III-3、III-4）Water distribution, last three-level horizontal drowned flow artificial wet land（III-3、
III-4）Water outlet is pooled to ultraviolet disinfection canal through braiding channel and carries out disinfection processing, and several downflow weirs are wherein all provided in biological pond.
MSBR is designed as 2 sets in parallel operation, and every group of MSBR size is 52.7 × 39m, every group of MSBR dischargeable capacity
13558.1m3, 1,6,7# pool unit available depths 6.5m, 2,3,4,5# pool unit available depths 8.0m, every group of total waterpower of MSBR
The hydraulic detention time of residence time 16.3h, 1,2,3,4,5,6 and 7# pool unit is respectively 3.1,0.8,0.5,1.1,1.3,
6.3 and 3.1h, sludge age 14.59d.
Using manually building aerobic biological pond or suitably being repaired to the natural biological pool, built in the aerobe pool shallow
Pool, transition region and the region of profundal zone three.First order biological pond volume 3850m3, both sides phytal zone beam overall 7m, the depth of water≤
0.4m, both sides transition region beam overall 6m, depth of water 0.4-1.6m, the wide 2-8m in intermediate profundal zone, depth of water 1.6-2m.Second level biological pond holds
Product 1750m3, both sides phytal zone beam overall 2m, the depth of water≤0.3m, both sides transition region beam overall 3m, depth of water 0.3-1.2m, intermediate profundal zone
Wide 2-8m, depth of water 1.2-1.5m.Third level biological pond volume 3200m3, both sides phytal zone beam overall 7m, the depth of water≤0.4m, both sides mistake
Cross area beam overall 6m, depth of water 0.4-1.6m, the wide 2-10m in intermediate profundal zone, depth of water 1.6-2.0m.Configured with heavy in the aerobe pool
Water, very water are swum and floatingleaved plant.
Using the rectangle like pond body of brick mix structure, the length and width dimensions of first order artificial swamp pond body are each about（68-81）m
×（43-57）M, area are each about 3300m2, ballast grain sizes about 20-50mm, depth are about 1.2m, and rubble bed volume is about
4000m3.The length and width dimensions of second level artificial swamp pond body are each about（94-98）m×（44-57）M, area are each about 4250m2,
Ballast grain sizes about 30-40mm, second level horizontal drowned flow artificial wet land rubble depth is about 1.0m, rubble bed volume is about
4250m3, second level free water surface wetland rubble depth about 0.6m, rubble bed volume are about 2600 m3.The first order, the second level are artificial
Each pond body of wetland is equidistantly being divided into 4 small wetland list on length direction with 200mm thickness brick mix structures wall is approximate
Member.The length and width dimensions of third level artificial swamp pond body are each about（68-86）m×（52-56）M, area are each about 4000m2, rubble
Grain size about 40-50mm, third level free water surface wetland rubble depth about 0.6m, rubble bed volume are about 2500 m3, three-level level is latent
Stream wetland rubble depth is about 1.0m, rubble bed volume is about 4000m3.Each pond body of third level artificial swamp is perpendicular to width
On direction equidistantly 3 small wetland units are divided into 200mm thickness brick mix structures wall is approximate.
The peripheral wall of the aerobe pool at different levels bottom and artificial swamp, bottom are laid with two cloth, one film geomembrane anti-seepage layer.It is good
Oxygen biological pond kind is implanted with the submerged plants such as eel grass, watermifoil, the emergent aquactic plants such as mushroom grass, cattail, reed, wild rice stem, water lily, eye
The floatingleaved plants such as dish.Level-one artificial swamp kind is implanted with the plants such as yellow flag, cattail, reed, canna, vetiver, and two level is artificial
Wetland kind is implanted with the plants such as yellow flag, cattail, cyperus alternifolius, canna, rush, wild rice stem, and three-stage constructed wetland kind is implanted with power again
The plants such as flower, reed, calamus, Lythrum salicaria, canna, mullet grass, wherein vertical subsurface flow wetland planting density are not less than 9
Strain/m2, free water surface wetland and horizontal subsurface flow wetland planting density are not less than 6 plants/m2。
China middle and south Urban Regeneration water factory design scale is 40,000 ton per days, is combined using " the MSBR+ artificial swamps "
Regeneration effluent process system, be discharged as the ecological water supplement of wetland park and the urban afforestation of large size city section, road-cleaning,
It carwash and flushes the toilet etc. water, the regeneration water factory to be used to have been subjected to the stable operation more than 5 years.
Claims (8)
1. a kind of regeneration effluent process system, including intake tunnel, exhalant canal, which is characterized in that in intake tunnel and water outlet
Improvement type sequencing batch reactor, artificial swamp advanced sewage treatment system and the disinfection being serially connected are equipped between channel successively
Canal；The first return duct is set between Improvement type sequencing batch reactor and intake tunnel, in artificial swamp advanced treatment of wastewater system
The second return duct is set between system and intake tunnel.
2. regeneration effluent process system as described in claim 1, which is characterized in that Improvement type sequencing batch reactor is by anaerobism
Multiple-unit integrated reactor made of pond, anoxic pond, main aeration tank, pre- anoxic pond, mud-water separation pond, two ponds SBR are co-walled.
3. regeneration effluent process system as described in claim 1, which is characterized in that artificial swamp advanced treatment of wastewater system
System is the multistage composite artificial swamp being serially connected, and by water (flow) direction, every level-one combined artificial wetland includes being located at upstream
The aerobe pool and artificial swamp positioned at downstream.
4. regeneration effluent process system as claimed in claim 3, which is characterized in that the multistage composite artificial swamp is three-level
Combined artificial wetland.
5. regeneration effluent process system as described in claim 3 or 4, which is characterized in that the people of first order combined artificial wetland
It is parallel with one another between each artificial wetland unit in work wetland, and be vertical subsurface flow wetland unit；Except the first order is compound
In the artificial swamp of other combined artificial wetlands at different levels other than artificial swamp, artificial swamp include it is several be serially connected it is artificial
The group of wetland unit composition, it is parallel with one another between each group；Artificial swamp unit in each group had both included water
Flat drowned flow artificial wet land unit, and include surface current artificial wetland's unit.
6. regeneration effluent process system as claimed in claim 3, which is characterized in that set multiple overflows in the aerobe pool
Weir.
7. regeneration effluent process system as claimed in claim 3, which is characterized in that afterbody combined artificial wetland it is artificial
In wetland, the artificial swamp unit close to disinfection canal is horizontal drowned flow artificial wet land unit.
8. regeneration effluent process system as claimed in claim 3, which is characterized in that kind is implanted with water in the artificial swamp
Plant, the water plant are canna, reed, cattail, yellow flag, calamus, thaliadeabata, Lythrum salicaria, rush, hay
In vain, one or more of cyperus alternifolius, vetiver, mullet grass.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108793409A (en) * | 2018-08-29 | 2018-11-13 | 陕西朗正环保科技有限公司 | A kind of sewage-treatment plant suitable for country sewage changes in flow rate |
| CN108793644A (en) * | 2018-08-29 | 2018-11-13 | 陕西朗正环保科技有限公司 | A kind of sewage-treatment plant that sewage water denitrification efficiency can be improved |
| CN108892241A (en) * | 2018-08-29 | 2018-11-27 | 陕西朗正环保科技有限公司 | Integrated rural sewage-treatment plant associated with a kind of AAO and SBR technique |
| CN109328519A (en) * | 2018-09-19 | 2019-02-15 | 中科国兴（绵阳）科技有限公司 | A method of improving agroecological environment using organic soil |
-
2017
- 2017-12-05 CN CN201721667212.0U patent/CN207713502U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108793409A (en) * | 2018-08-29 | 2018-11-13 | 陕西朗正环保科技有限公司 | A kind of sewage-treatment plant suitable for country sewage changes in flow rate |
| CN108793644A (en) * | 2018-08-29 | 2018-11-13 | 陕西朗正环保科技有限公司 | A kind of sewage-treatment plant that sewage water denitrification efficiency can be improved |
| CN108892241A (en) * | 2018-08-29 | 2018-11-27 | 陕西朗正环保科技有限公司 | Integrated rural sewage-treatment plant associated with a kind of AAO and SBR technique |
| CN108793409B (en) * | 2018-08-29 | 2023-12-29 | 中化学朗正环保科技有限公司 | Sewage treatment device suitable for rural sewage flow change |
| CN109328519A (en) * | 2018-09-19 | 2019-02-15 | 中科国兴（绵阳）科技有限公司 | A method of improving agroecological environment using organic soil |
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