CN105016601A - Electro-osmotic dewatering technology for biological sludge - Google Patents
Electro-osmotic dewatering technology for biological sludge Download PDFInfo
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- CN105016601A CN105016601A CN201510382946.3A CN201510382946A CN105016601A CN 105016601 A CN105016601 A CN 105016601A CN 201510382946 A CN201510382946 A CN 201510382946A CN 105016601 A CN105016601 A CN 105016601A
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- biological sludge
- electroosmotic dewatering
- dewatering
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- dehydration
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- 239000010802 sludge Substances 0.000 title claims abstract description 58
- 238000005516 engineering process Methods 0.000 title abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 34
- 239000000706 filtrate Substances 0.000 claims abstract description 8
- 230000018044 dehydration Effects 0.000 claims description 35
- 238000006297 dehydration reaction Methods 0.000 claims description 35
- 239000010865 sewage Substances 0.000 claims description 20
- 239000013543 active substance Substances 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000005189 flocculation Methods 0.000 claims description 9
- 230000016615 flocculation Effects 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- ZTOKUMPYMPKCFX-CZNUEWPDSA-N (E)-17-[(2R,3R,4S,5S,6R)-6-(acetyloxymethyl)-3-[(2S,3R,4S,5S,6R)-6-(acetyloxymethyl)-3,4,5-trihydroxyoxan-2-yl]oxy-4,5-dihydroxyoxan-2-yl]oxyoctadec-9-enoic acid Chemical group OC(=O)CCCCCCC/C=C/CCCCCCC(C)O[C@@H]1O[C@H](COC(C)=O)[C@@H](O)[C@H](O)[C@H]1O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](COC(C)=O)O1 ZTOKUMPYMPKCFX-CZNUEWPDSA-N 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 239000003876 biosurfactant Substances 0.000 claims description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 241000282326 Felis catus Species 0.000 claims description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 239000003945 anionic surfactant Substances 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 2
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims description 2
- 229960002796 polystyrene sulfonate Drugs 0.000 claims description 2
- 239000011970 polystyrene sulfonate Substances 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- FCBUKWWQSZQDDI-UHFFFAOYSA-N rhamnolipid Chemical compound CCCCCCCC(CC(O)=O)OC(=O)CC(CCCCCCC)OC1OC(C)C(O)C(O)C1OC1C(O)C(O)C(O)C(C)O1 FCBUKWWQSZQDDI-UHFFFAOYSA-N 0.000 claims description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000004094 surface-active agent Substances 0.000 abstract description 2
- 239000012065 filter cake Substances 0.000 abstract 2
- 239000008394 flocculating agent Substances 0.000 abstract 1
- 238000009472 formulation Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 230000003311 flocculating effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000011345 viscous material Substances 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 210000004681 ovum Anatomy 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention relates to an electro-osmotic dewatering technology for biological sludge, which comprises the following steps: 1)mechanical dewatering treatment; 2) electro-osmotic dewatering pretreatment; 3)electro-osmotic dewatering treatment; 4)dewatering filtrate recovery; and 5) dewatering filter cake collection. The water content of the dewatering filter cake obtained in the above steps is less than 55%. The method has the beneficial effect that the dewatering technology employs a surfactant and a flocculating agent for complex formulation, water content of the dewatered sludge is reduced, and sludge dewatering rate is increased. According to the invention, a mechanical dewatering step is carried out so that free water and interstitial water in sludge can be removed, the water content is reduced to 75-80%, then an electro-osmotic dewatering step is carried out, so that electro-osmotic dewatering time is saved, service life of an electrode is increased, and loss can be reduced.
Description
Technical field
The present invention relates to dewatering technology of mud, particularly relate to the electroosmotic dewatering technique of biological sludge, belong to sewage discharge and technical field of sludge treatment.
Background technology
A kind of solid pollutant produced when mud is disposed of sewage as municipal sewage plant, the extremely complicated heterogeneous body be made up of organism, inorganic salts, microorganism and parasitic ovum etc.Overwhelming majority municipal sewage plant all adopts Wastewater Treated by Activated Sludge Process sewage.Due to the needs that Microbial Communities in Activated Sludge updates, in sewage treatment process, inevitably produce unnecessary mud.The main characteristic of mud is that water ratio is high, and what have even can up to more than 99%, and organic content is high, and easily corruption is smelly, and particle is comparatively thin, and proportion is less.Due in mud containing various pollutent, if do not carry out harmless treatment, disposal, directly render in environment, will to environment, if be directly sent to garbage treatment field to carry out the normal operational management that landfill can have a strong impact on disposal site.If mud is directly stacked, then easily rot smelly.Therefore mud must carry out appropriate process and disposal, otherwise a large amount of mud without stabilizing treatment not only become the heavy burden of sewage work, and any discharge of mud and heap surrounding environment of being rivals in a contest causes again new pollution, cause the sewage work built up not give full play to effect that it eliminates environmental pollution.
The biological treatment process of sewage can produce the biological sludge of a large amount of high-moisture percentage, and general water ratio is greater than 99%, for the ease of follow-up transport and disposal, generally will carry out processed to mud, obtains the higher mud of solid content and can reduce its volume.Biological sludge is a kind of dispersed system of uneven complexity, different with function according to the position of water in mud flco, Bound moisture, interstitial water, capillary water and free water can be divided into, wherein interstitial water and free water are removed by mechanical means, and Bound moisture participates in being formed the living microorganism in mud, remove after cell wall breaking can only being made by drying.The dewater phase of usual mud is from the viewpoint of two: degree of dehydration and rate of water loss, wherein conventional flocculation agent add the rate of water loss that obviously can improve mud, but the water ratio of final mud cake can not be made to reduce, namely can not improve the degree of dehydration of mud.The membership that adds of tensio-active agent makes water ratio after sludge dewatering reduce, but the rate of water loss of mud also can be made slack-off, because the solublization of tensio-active agent and dissemination can make hydrophilic radical, such as extracellular polymeric is transferred in supernatant liquor, change size and the hydrophobe row of mud flco, part Bound moisture is made to be converted into free water, but the increase of extracellular polymeric makes the relative hydrophobicity of mud reduce simultaneously, the flocculating property of mud flco is caused to be deteriorated, although be therefore used alone the water ratio that tensio-active agent can reduce dehydrated sludge, but rate of water loss reduces.Composite a certain proportion of flocculation agent can improve the drawback that rate of water loss reduces, and does not affect again the reduction of water ratio simultaneously, obtains good dehydrating effect.
Summary of the invention
The present invention is high in order to solve biological sludge water ratio, removes in conjunction with shipwreck, and removing process is complicated, and the shortcomings such as cost is higher, provide a kind of convenient and practical biological sludge electroosmotic dewatering technique.
Technical scheme of the present invention is, a kind of electroosmotic dewatering technique of biological sludge, is characterized in that comprising the following steps:
(1) mechanical dehydration process: first carried out mechanical dehydration process before biological sludge electroosmotic dewatering technique, biological sludge water ratio is reduced to 75% ~ 80% from 95% ~ 99%;
(2) electroosmotic dewatering pre-treatment: biological sludge enters pretreatment pool after mechanical dehydration process, adds tensio-active agent and flocculation agent in pretreatment pool, stirring velocity is 1000r/min;
(3) electroosmotic dewatering: enter electroosmotic dewatering equipment through pretreated biological sludge, electroosmotic dewatering is simultaneously with mechanical dehydration;
(4) dehydration filtrate reclaims: the dehydration filtrate obtained through step (1) and step (2) enters Sewage treatment systems;
(5) dewatered cake is collected: the dewatered cake obtained through above-mentioned four steps records water ratio and is less than 55%.
Described mechanical dehydration process comprises centrifuge dehydration and filter-press dehydration.Before carrying out electroosmotic dewatering, first carry out mechanical dehydration can go out interstitial water in mud and Bound moisture, the water ratio of mud is made to be reduced to 75 ~ 80%, thus improve the efficiency of electroosmotic dewatering, save wearing and tearing and the consumption of electroosmotic dewatering equipment simultaneously, extend the work-ing life of electrode.
One or more in described filter-press dehydration filter cloth upper strata place mat diatomite, flyash or terra alba.Although the water ratio in mud is very high, but the viscous substance inside mud is more, direct press filtration can make filter cloth space block, reduce speed of filter pressing, and one or more in filter cloth upper strata place mat diatomite, flyash or terra alba, viscous substance in energy active adsorption mud, increases speed of filter pressing.
Described tensio-active agent is one or both or three kinds in anion surfactant, cats product or bio-surfactant.
Tensio-active agent has solublization and dissemination, some macromolecular hydrophilic radical can be made to be transferred in supernatant liquor, the association of its hydrophobic structure destroys the colloidal open structure of mud flco on the other hand, make Sludge Surface hydrophobization, capillary can remove in conjunction with hydration surface adsorption water.Bio-surfactant, except having the effect of general chemical surfactant, also has temperature tolerance, salt resistance, acid and alkali-resistance etc., and little to environmental hazard, and synthesis is simple, and energy consumption is low.
Described tensio-active agent is sophorolipid or rhamnolipid, and add-on is 0.5 ~ 1% of sludge quality.
Described flocculation agent is that one or more in sodium polyacrylate, polyacrylamide, poly styrene sulfonate, polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, PAFS are composite, and add-on is 1 ~ 2% of sludge quality.
Add alkali lye or oxygenant at the anode place of electroosmotic dewatering equipment, keep the pH value of biological sludge 7 ~ 7.5.
During electroosmotic dewatering, the material bed low bottom of internal upper part moisture percentage in sewage sludge is high, and during mechanical dehydration, low bottom, material bed interior water ratio top is high, and osmosis and mechanical dehydration combine and material bed overall moisture content can be made even, improve dewatering speed.
Beneficial effect of the present invention is:
1, the water ratio after this dewatering process uses tensio-active agent effectively to reduce sludge dewatering.
2, this dewatering process use tensio-active agent and flocculation agent composite, not only reduce the water ratio after sludge dewatering, and improve the speed of sludge dewatering.
3, first carry out mechanical dehydration in this dewatering process, the free water in mud and interstitial water are removed, and water ratio is reduced to 75 ~ 80%, and then carry out electroosmotic dewatering, so not only save the time of electroosmotic dewatering, and the work-ing life of electrode can be increased, Loss reducing.
4, this dewatering process is practical, can transform on the basis of existing equipment, is convenient to the transformation of factory to existing installation, reduces the cost that novel process is implemented.
Embodiment
By the following examples the present invention is specifically described.
Embodiment one:
By the sanitary sewage remaining biological sludge of sewage work through biological treatment, water ratio is 99%, filter-press dehydration pond is delivered to through spiral pump, first place mat 10cm diatomite on filter cloth, the thickened sludge of water ratio 79% is obtained after 15min press filtration, mud after concentrated is delivered to electroosmotic dewatering pretreatment pool by spiral pump, add sophorolipid, the amount added is 0.5% of thickened sludge amount, carry out mechanical stirring, stirring velocity is 1000r/min, churning time 30min, enters electroosmotic dewatering equipment through pretreated mud.Electroosmotic dewatering equipment adopts electroosmotic dewatering and mechanical dehydration to combine, electroosmotic dewatering electrode adopts direct current and exchanges alternately to electricity, dewatering time 50min, the moisture content of the cake 47% obtained, mud cake can do sludge fuel, and dehydration filtrate enters Sewage treatment systems.
Embodiment two:
By the sanitary sewage remaining biological sludge of sewage work through biological treatment, water ratio is 99%, filter-press dehydration pond is delivered to through spiral pump, first place mat 10cm diatomite on filter cloth, the thickened sludge of water ratio 79% is obtained after 15min press filtration, mud after concentrated is delivered to electroosmotic dewatering pretreatment pool by spiral pump, add polyacrylamide, the amount added is 2.5% of thickened sludge amount, carry out mechanical stirring, stirring velocity is 1000r/min, churning time 30min, enters electroosmotic dewatering equipment through pretreated mud.Electroosmotic dewatering equipment adopts electroosmotic dewatering and mechanical dehydration to combine, electroosmotic dewatering electrode adopts direct current and exchanges alternately to electricity, dewatering time 30min, the moisture content of the cake 55% obtained, mud cake can do sludge fuel, and dehydration filtrate enters Sewage treatment systems.
Embodiment three:
By the sanitary sewage remaining biological sludge of sewage work through biological treatment, water ratio is 99%, filter-press dehydration pond is delivered to through spiral pump, first place mat 10cm diatomite on filter cloth, the thickened sludge of water ratio 79% is obtained after 15min press filtration, mud after concentrated is delivered to electroosmotic dewatering pretreatment pool by spiral pump, add polyacrylamide and sophorolipid mixture, compound proportion is the amount that 5:1 adds is 1% of thickened sludge amount, carry out mechanical stirring, stirring velocity is 1000r/min, churning time 30min, electroosmotic dewatering equipment is entered through pretreated mud.Electroosmotic dewatering equipment adopts electroosmotic dewatering and mechanical dehydration to combine, electroosmotic dewatering electrode adopts direct current and exchanges alternately to electricity, dewatering time 20min, the moisture content of the cake 43% obtained, mud cake can do sludge fuel, and dehydration filtrate enters Sewage treatment systems.
The membership that adds of tensio-active agent makes water ratio after sludge dewatering reduce, but the rate of water loss of mud also can be made slack-off, because the solublization of tensio-active agent and dissemination can make hydrophilic radical, such as extracellular polymeric is transferred in supernatant liquor, change size and the hydrophobe row of mud flco, part Bound moisture is made to be converted into free water, but the increase of extracellular polymeric makes the relative hydrophobicity of mud reduce simultaneously, the flocculating property of mud flco is caused to be deteriorated, although be therefore used alone the water ratio that tensio-active agent can reduce dehydrated sludge, but rate of water loss reduces.Composite a certain proportion of flocculation agent can improve the drawback that rate of water loss reduces, and does not affect again the reduction of water ratio simultaneously, obtains good dehydrating effect.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (9)
1. an electroosmotic dewatering technique for biological sludge, is characterized in that comprising the following steps:
(1) mechanical dehydration process: first carried out mechanical dehydration process before biological sludge electroosmotic dewatering technique, biological sludge water ratio is reduced to 75% ~ 80% from 95% ~ 99%;
(2) electroosmotic dewatering pre-treatment: biological sludge enters pretreatment pool after mechanical dehydration process, adds tensio-active agent and flocculation agent in pretreatment pool, stirring velocity is 1000r/min;
(3) electroosmotic dewatering: enter electroosmotic dewatering equipment through pretreated biological sludge, electroosmotic dewatering is simultaneously with mechanical dehydration;
(4) dehydration filtrate reclaims: the dehydration filtrate obtained through step (1) and step (2) enters Sewage treatment systems;
(5) dewatered cake is collected: the dewatered cake obtained through above-mentioned four steps records water ratio and is less than 55%.
2. the electroosmotic dewatering technique of a kind of biological sludge according to claim 1, is characterized in that: described mechanical dehydration process comprises centrifuge dehydration and filter-press dehydration.
3. the electroosmotic dewatering technique of a kind of biological sludge according to claim 1, is characterized in that: one or more in described filter-press dehydration filter cloth upper strata place mat diatomite, flyash or terra alba.
4. the electroosmotic dewatering technique of a kind of biological sludge according to claim 1, is characterized in that: described tensio-active agent is one or both or three kinds in anion surfactant, cats product or bio-surfactant.
5. the electroosmotic dewatering technique of a kind of biological sludge according to claim 1, is characterized in that: described tensio-active agent is sophorolipid or rhamnolipid.
6. the electroosmotic dewatering technique of a kind of biological sludge according to claim 4 or 5, is characterized in that: the add-on of described tensio-active agent is 5 ~ 10% of sludge quality.
7. the electroosmotic dewatering technique of a kind of biological sludge according to claim 1, is characterized in that: described flocculation agent is that one or more in sodium polyacrylate, polyacrylamide, poly styrene sulfonate, polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, PAFS are composite.
8. the electroosmotic dewatering technique of a kind of biological sludge according to claim 7, is characterized in that: the add-on of described flocculation agent is 1 ~ 2% of sludge quality.
9. the electroosmotic dewatering technique of a kind of biological sludge according to claim 1, is characterized in that: add alkali lye or oxygenant at the anode place of electroosmotic dewatering equipment, keeps the pH value of biological sludge 7 ~ 7.5.
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| CN201510382946.3A CN105016601A (en) | 2015-07-03 | 2015-07-03 | Electro-osmotic dewatering technology for biological sludge |
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| CN201510382946.3A CN105016601A (en) | 2015-07-03 | 2015-07-03 | Electro-osmotic dewatering technology for biological sludge |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105776799A (en) * | 2016-03-10 | 2016-07-20 | 江苏圣意达自控科技有限公司 | Factorization electroosmosis sludge dehydration treatment process |
| CN106006888A (en) * | 2016-06-29 | 2016-10-12 | 浙江瑞霖环保科技有限公司 | Sewage sludge joint treatment technology |
| CN106430890A (en) * | 2016-10-26 | 2017-02-22 | 中国建筑材料科学研究总院 | Sludge dewatering method for reduction |
| CN106865719A (en) * | 2017-03-24 | 2017-06-20 | 青岛华蓝普环保工程有限公司 | A kind of inorganic agent for paper industry pulping sewage |
| CN108164124A (en) * | 2018-02-24 | 2018-06-15 | 北京城市排水集团有限责任公司 | A kind of deep dehydration conditioner and its application suitable for advanced anaerobically digested sludge |
| CN108423962A (en) * | 2017-02-14 | 2018-08-21 | 湖南省环境保护科学研究院 | A method of improving dewatering performance of sludge |
| CN109734269A (en) * | 2019-02-28 | 2019-05-10 | 苏州高新北控中科成环保产业有限公司 | A kind of stage improvement method improving the saturating dewatering of sludge electroosmotic |
| CN109836026A (en) * | 2019-04-03 | 2019-06-04 | 平湖市三禾染整有限公司 | A kind of dyeing and finishing device for dehydrating sladge waste and its technique |
| CN110526550A (en) * | 2019-08-21 | 2019-12-03 | 北京首创污泥处置技术有限公司 | A kind of deep dehydration medicament for solid phase sludge |
| CN111068659A (en) * | 2019-12-13 | 2020-04-28 | 中山大学 | Composite piezoelectric catalytic material, preparation method thereof and sludge dewatering application |
| WO2024015720A1 (en) * | 2022-07-11 | 2024-01-18 | Locus Solutions Ipco, Llc | Compositions and methods for dewatering |
| CN117486326A (en) * | 2023-11-02 | 2024-02-02 | 安徽萃英兰萌生物科技有限公司 | A new type of highly efficient biological algae inhibitor |
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Cited By (16)
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| CN106865719A (en) * | 2017-03-24 | 2017-06-20 | 青岛华蓝普环保工程有限公司 | A kind of inorganic agent for paper industry pulping sewage |
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| CN111068659A (en) * | 2019-12-13 | 2020-04-28 | 中山大学 | Composite piezoelectric catalytic material, preparation method thereof and sludge dewatering application |
| CN111068659B (en) * | 2019-12-13 | 2021-02-05 | 中山大学 | Composite piezoelectric catalytic material, preparation method thereof and sludge dewatering application |
| WO2024015720A1 (en) * | 2022-07-11 | 2024-01-18 | Locus Solutions Ipco, Llc | Compositions and methods for dewatering |
| CN117486326A (en) * | 2023-11-02 | 2024-02-02 | 安徽萃英兰萌生物科技有限公司 | A new type of highly efficient biological algae inhibitor |
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