CN105366909A - Sludge deep-dehydration technology - Google Patents

Sludge deep-dehydration technology Download PDF

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Publication number
CN105366909A
CN105366909A CN201510763808.XA CN201510763808A CN105366909A CN 105366909 A CN105366909 A CN 105366909A CN 201510763808 A CN201510763808 A CN 201510763808A CN 105366909 A CN105366909 A CN 105366909A
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sludge
hydro
technique
mud
flocculation
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CN105366909B (en
Inventor
张海静
黎慧娟
王展
李勇
杜成琼
熊珊
左莉娜
郭沨
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China Power Construction Environmental Protection Technology Co.,Ltd.
PowerChina Zhongnan Engineering Corp Ltd
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Hunan Central-South Water Utilities Environmental Protection Technology Co Ltd
PowerChina Zhongnan Engineering Corp Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/10Treatment of sludge; Devices therefor by pyrolysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/123Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/06Sludge reduction, e.g. by lysis

Abstract

The invention discloses a sludge deep-dehydration technology. The technology comprises hydro-thermal reaction, flocculation conditioning and mechanical dehydration. The hydro-thermal reaction process comprises adding 5-13kg of a surfactant into each ton of dry sludge, putting the surfactant and sludge into a hydro-thermal reactor and carrying out a sludge hydro-thermal reaction process at a temperature of 120-160 DEG C under relative pressure of 0.5-1.2 MPa. The sludge deep-dehydration technology has dehydrated sludge water content of 55% or less, greatly reduces sludge follow-up treatment difficulty and reduces a sludge follow-up treatment cost.

Description

A kind of technique of deeply dehydrating sludge
Technical field
The present invention relates to a kind of technique of deeply dehydrating sludge, belong to field of environment engineering.
Background technology
Along with improving constantly of wastewater treatment in China rate, the output of mud is also in rising trend, mud as the by product of water treatment, containing a large amount of hardly degraded organic substance, heavy metal and salt, and pathogenic micro-organism and worm's ovum, will serious secondary pollution be caused if do not deal carefully with.
Excess sludge, namely the mud produced after sewage disposal, topmost feature is exactly that water ratio is high, even up to 99%, to realize sludge reduction be the most also most effective means is exactly remove the moisture in mud, but due to excess sludge complicated component, in flco state, its dewatering extreme difference, if undressed mud directly carries out mechanical dehydration, moisture content of the cake is still up to about 80%, this is well below China's solid refuse standard of landfill (water ratio is less than 60%), therefore before mechanical sludge dewatering, the effectively measure of nursing one's health is taked to improve dewatering performance of sludge to mud, reduce the water ratio of mud, not only can reduce the difficulty of the follow-up disposal of mud, butt sludge content in mud can also be improved, reduce the follow-up disposal costs of mud.
At present, common mud dewatering method has mummification method, mechanical process, conditioning method.The commonly natural mummification of mummification method and heating and drying two kinds, natural mummification is a kind of simply traditional dewatering, and dehydration cost is low, but because dewatering efficiency is low, floor space is large, and large to surrounding environment influence, therefore natural mummification is seldom used in big-and-middle-sized Sewage Plant; Heating and drying is a kind of method adopting the method for Heat artificially that the moisture in mud is evaporated fast, although dewatering efficiency is high, moisture percentage in sewage sludge after dehydration can be down to 10%-30%, but working cost is higher, comparatively large to surrounding environment influence, compare and be suitable for focusing on and disposal of middle-size and small-size sewage plant sludge.Mechanical dehydration common are centrifuge dehydration, filter press dehydration, belt type filter-pressing dehydration plant, vacuum filtering and dewatering, and vacuum filtering and dewatering dewaters noise greatly due to it, and moisture content of the cake is high and floor space large, is therefore seldom used; Compare other dewatering, filter press dehydrated sludge cake water ratio is lower, but the application of shortcoming limits its Large Sewage Treatment Plant at home such as due to its discontinuous operating mode, dewatering efficiency is low, and operating environment is poor, and level of automation is not high; Centrifuge dehydration and belt type dehydration are still widely applied with working cost is low due to easy to operate.Conditioning method has chemical conditioning, physics conditioning, biological conditioning, wherein chemical conditioning due to cost of investment low, simple operation and other advantages is still widely adopted at present.
Hydro-thermal molten born of the same parents technology is the molten born of the same parents' modification technology of a kind of emerging physics, by mud is heated, microorganism cells cracking in mud is promoted under certain temperature and pressure, in release cells, material is in liquid phase, thus reach destruction mud flocculation structure, improve a kind of method of dewatering performance of sludge object, generalized case, along with the raising of mud temperature, mud molten born of the same parents effect is better, but there are some researches show when mud temperature reaches 200 DEG C, and mud easily produces a kind of insoluble material, affect dewatering performance of sludge, this phenomenon is Maillard reaction.
The domestic research about sludge water thermosol born of the same parents modification promotion sludge dewatering is little at present, Chinese patent CN103880266A relates to a kind of hydrothermal method mud dewatering method and device, the method is dewatered to the wet mud after preheating by two-stage hydro-thermal reaction, one-level hydrothermal temperature is 220-280 DEG C, reaction times 5-15min, second order reaction 160-200 DEG C, reaction times is 20-60min, after hydro-thermal reaction, moisture percentage in sewage sludge is between 50%-60%, the advantage of this contrive equipment is in two-stage hydrothermal reaction process, the heat that the cooling adopted produces achieves reusing of energy source to mud preheating, but because temperature is high, pressure is large, there is the hidden danger of safety and topsoil, in addition Mei Lade phenomenon is easily produced when temperature is more than 200 DEG C, affect the dewatering of mud, therefore have much room for improvement.
Chinese patent CN103964662A discloses a kind of continous way mud dewatering method based on hydrothermal treatment consists, the method is that heating temperatures is carried out hydro-thermal reaction to more than 150 DEG C, mud after hydrothermal treatment consists is introduced into the continuously dehydrating that continous way squeezing dehydration device realizes mud, filtrate after dehydration enters the anaerobic digestion of efficient anaerobic processing unit and produces biogas, Land_use change is carried out after the liquid purification of natural pond, what the method introduced is the continuous operation how realizing sludge dehydration process, the introduction not too much to sludge water process of thermal treatment, concrete case study on implementation introduction is not had yet, therefore the emphasis of this patent is the continuous operation how realizing sludge dewatering, but not hydrothermal modification dehydration.
Chinese patent CN102381820A discloses a kind of sludge treatment technique based on hydrothermal modification technology, this technique is that mud after mechanical dehydration is entered slurrying device, mud after pulp enters hydrothermal reactor and is heated to 180 DEG C and carries out hydro-thermal reaction, after hydro-thermal, mud enters vacuum flashing in flasher, after water cooler is cooled to 35-45 DEG C, enters autoclave diaphragm pressure filter carries out filter-press dehydration, dehydration filtrate enters anaeration in normal temperature reactor and carries out anaerobic reaction, dehydrated sludge cake is made into biomass dyestuff rod, entering boiler for hydrothermal reactor provides steam, it is good that this technique has treatment effect, subtract appearance successful, innoxious degree is high, the advantages such as methane recovery utilization benefit is good, this technique is improved water separation capability and the anaerobic digestion ability of mud.
Flocculation conditioning dehydration of the prior art adopts conventional flocculant molysite, calcium salt and polyacrylamide flocculant etc., flocculating effect is bad, and in conjunction with conventional mechanical dehydration, dehydration rate generally reaches about 80%, dehydration rate is lower, and little Bound moisture thermal response carries out flocculation conditioning.
Summary of the invention
The technical problem that the present invention solves carries out hydro-thermal reaction at relatively high temperatures, and mud easily produces a kind of insoluble material, affects dewatering performance of sludge.
Technical scheme of the present invention is, a kind of technique of deeply dehydrating sludge is provided, comprise hydro-thermal reaction, flocculation conditioning and mechanical dehydration successively, it is characterized in that, described hydro-thermal reaction comprises the following steps: add tensio-active agent 5-13kg by dewatered sludge per ton, is added in hydrothermal reaction kettle by tensio-active agent and mud; Make mud temperature be 120-160 DEG C, relative pressure carries out hydro-thermal reaction under being the condition of 0.5-1.2MPa.
Further, described tensio-active agent is cats product.
Further, described cats product is free benzyl trimethyl ammonium chloride, dodecyl benzyl dimethyl ammonium chloride or distearyl dimethyl ammonium chloride.
Further, described flocculation conditioning comprises the following steps: after hydro-thermal reaction completes, when temperature of reaction drops to 60-70 DEG C, adds flocculation agent 10-50kg, in hydrothermal reaction kettle, add flocculation agent by dewatered sludge per ton, and stir, flocculation conditioning time is 30-60min.
Further, described flocculation agent is made up of organic floculant and inorganic flocculating agent, organic floculant is selected from wheat stalk, maize straw, sugarcane stalk and/or wood chip, and inorganic flocculating agent is selected from ironic hydroxide and/or aluminium hydroxide, and the mass ratio of organic floculant and inorganic flocculating agent is 1:2-1:5.
Further, the particle diameter of described flocculation agent is 100-200 μm.
Further, first described flocculation agent is deployed into the suspension liquid that massfraction is 20-30%, then adds in hydrothermal reaction kettle.
Further, described mechanical dehydration is belt press filtration.
Further, described hydro-thermal reaction low whipping speed is carry out under the condition of 150-250r/min.
The principle of molten born of the same parents' reaction (abbreviation hydro-thermal reaction) of hydro-thermal is by being heated by mud, microorganism cells cracking in mud is promoted under certain temperature and pressure, in release cells, material is in liquid phase, thus reaches destruction mud flocculation structure, improves dewatering performance of sludge object.The tensio-active agent added significantly improves the hydrophobic performance of mud, and the flocculation conditioning in conjunction with high efficiency composition flocculation agent makes mud very easily dewater, and the tensio-active agent added is cats product, greatly can improve the hydrophobic performance of mud.Adding of tensio-active agent makes the molten born of the same parents' temperature of reaction reduction of hydro-thermal, energy consumption reduces, and hydro-thermal mode makes again tensio-active agent easily be adsorbed on Sludge Surface and affect its interfacial property simultaneously, and the flocculation conditioning in conjunction with high efficiency composition flocculation agent makes mud very easily dewater; Mierocrystalline cellulose, poly-pentose is had in this body structure in wheat stalk, maize straw, sugarcane stalk, these materials of wood chip in composite flocculation agent, and the acidic substance such as tannin, also have some aldehyde, ketone, alcohol, ester, wherein containing a large amount of hydroxyl, carboxy moiety free hydroxyl group, free amino acid and free xylogen, these functional groups can absorbed portion cationic species and organism; And Fe (OH) 3and Al (OH) 3suspension has certain flocculating function, by organism strong for these absorption properties and flocculating function strong inorganics composition high efficiency composition flocculation agent be used for mud flocculation conditioning make dewater after moisture percentage in sewage sludge reach less than 55%, greatly reduce the difficulty of the follow-up disposal of mud, decrease the follow-up disposal costs of mud.
The present invention compared with prior art has the following advantages and effect:
1) method provided by the invention is simple, condition easy to control; Add tensio-active agent, effectively reduce the temperature of hydro-thermal reaction, prevent the generation of Mei Lade phenomenon, improve the dewatering that mud is follow-up.
2) method provided by the invention because carrying out in the closed environment of autoclave, and can produce the material of environment without obnoxious flavour and other, the secondary pollution therefore produced is little.
3) high efficiency composition About Flocculating Effect of Flocculant provided by the invention is good, is cheaply easy to get.
4) method provided by the invention adopts the molten born of the same parents' modification of hydro-thermal and high efficiency composition flocculation agent to act synergistically deeply dehydrating sludge, mud is made to reach less than 55% at may pressure filter water ratio, 30% is declined than conventional flocculation conditioning+belt type dehydration moisture percentage in sewage sludge, greatly reduce the difficulty of the follow-up disposal of mud, decrease the follow-up disposal costs of mud.
Embodiment
Following examples are intended to further illustrate the present invention, instead of limitation of the invention.
Embodiment 1
1, hydro-thermal reaction: free for tensio-active agent benzyl trimethyl ammonium chloride and mud are added in the middle of hydrothermal reaction kettle, the addition of free benzyl trimethyl ammonium chloride is 1.3% of one ton of dewatered sludge, closed by reactor, start to heat, temperature is set as 120 DEG C, reaction pressure is 0.5MPa, after temperature and pressure is stable, open whipping appts, stirring velocity 200r/min, reaction times is 60min, and reaction terminates to adopt naturally cooling cooling;
2, the preparation of high efficiency composition flocculation agent: wood chip and ironic hydroxide are carried out mixing in the ratio of 1:2, grind, sieve, makes particle diameter at 100-200 micron, add water be mixed with 20% suspension;
3, flocculation conditioning: when the temperature of question response still drops to 70 DEG C, open reactor, add high efficiency composition flocculation agent, addition is 5% of one ton of dewatered sludge, is closed by reactor, and open whipping appts, stirring velocity 150r/min, flocculation conditioning time is 60min.
4, continuously dehydrating: flocculation conditioning terminates rear employing continous way squeezing dehydration device and dewaters, and the moisture percentage in sewage sludge after dehydration reaches 52%, and outward transport, the mud after dehydration takes off filtrate and carries out recycling by anaerobically fermenting methane phase technology.
Embodiment 2
1, hydro-thermal reaction: surfactant sodium dodecyl base dimethyl benzyl ammonium chloride and mud are added in the middle of hydrothermal reaction kettle, the addition of dodecyl benzyl dimethyl ammonium chloride is 0.5% of one ton of dewatered sludge, closed by reactor, start to heat, temperature is set as 160 DEG C, reaction pressure is 1.2MPa, after temperature and pressure is stable, open whipping appts, stirring velocity 200r/min, reaction times is 30min, and reaction terminates to adopt naturally cooling cooling;
2, the preparation of high efficiency composition flocculation agent: stalk and aluminium hydroxide are carried out mixing in the ratio of 1:5, grind, sieve, makes particle diameter at 100-200 micron, add water be mixed with 30% suspension;
3, flocculation conditioning: when the temperature of question response still drops to 60 DEG C, open reactor, add high efficiency composition flocculation agent, addition is 1% of one ton of dewatered sludge, is closed by reactor, and open whipping appts, stirring velocity 150r/min, flocculation conditioning time is 30min.
4, continuously dehydrating: flocculation conditioning terminates rear employing continous way squeezing dehydration device and dewaters, and the moisture percentage in sewage sludge after dehydration reaches 55%, and outward transport, the mud after dehydration takes off filtrate and carries out recycling by anaerobically fermenting methane phase technology.
Embodiment 3
1, hydro-thermal reaction: tensio-active agent distearyl dimethyl ammonium chloride and mud are added in the middle of hydrothermal reaction kettle, the addition of distearyl dimethyl ammonium chloride is 1% of one ton of dewatered sludge, closed by reactor, start to heat, temperature is set as 140 DEG C, reaction pressure is 1MPa, after temperature and pressure is stable, open whipping appts, stirring velocity 200r/min, reaction times is 40min, and reaction terminates to adopt naturally cooling cooling;
2, the preparation of high efficiency composition flocculation agent: wood chip and aluminium hydroxide are carried out mixing in the ratio of 1:2, grind, sieve, makes particle diameter at 100-200 micron, add water be mixed with 20% suspension;
3, flocculation conditioning: when the temperature of question response still drops to 70 DEG C, open reactor, add high efficiency composition flocculation agent, addition is 2% of one ton of dewatered sludge, is closed by reactor, and open whipping appts, stirring velocity 150r/min, flocculation conditioning time is 40min.
4, continuously dehydrating: flocculation conditioning terminates rear employing continous way squeezing dehydration device and dewaters, and the moisture percentage in sewage sludge after dehydration reaches 55%, and outward transport, the mud after dehydration takes off filtrate and carries out recycling by anaerobically fermenting methane phase technology.
Embodiment 4
1, hydro-thermal reaction: surfactant sodium dodecyl base dimethyl benzyl ammonium chloride and mud are added in the middle of hydrothermal reaction kettle, the addition of dodecyl benzyl dimethyl ammonium chloride is 0.8% of one ton of dewatered sludge, closed by reactor, start to heat, temperature is set as 160 DEG C, reaction pressure is 1.2MPa, after temperature and pressure is stable, open whipping appts, stirring velocity 200r/min, reaction times is 30min, and reaction terminates to adopt naturally cooling cooling;
2, the preparation of high efficiency composition flocculation agent: stalk and ironic hydroxide are carried out mixing in the ratio of 1:5, grind, sieve, makes particle diameter at 100-200 micron, add water be mixed with 20% suspension;
3, flocculation conditioning: when the temperature of question response still drops to 60 DEG C, open reactor, add high efficiency composition flocculation agent, addition is 3% of one ton of dewatered sludge, is closed by reactor, and open whipping appts, stirring velocity 150r/min, flocculation conditioning time is 30min.
4, continuously dehydrating: flocculation conditioning terminates rear employing continous way squeezing dehydration device and dewaters, and the moisture percentage in sewage sludge after dehydration reaches 53%, and outward transport, the mud after dehydration takes off filtrate and carries out recycling by anaerobically fermenting methane phase technology.

Claims (9)

1. the technique of a deeply dehydrating sludge, comprise hydro-thermal reaction, flocculation conditioning and mechanical dehydration successively, it is characterized in that, described hydro-thermal reaction comprises the following steps: add tensio-active agent 5-13kg by dewatered sludge per ton, is added in hydrothermal reaction kettle by tensio-active agent and mud; Make mud temperature be 120-160 DEG C, relative pressure carries out hydro-thermal reaction under being the condition of 0.5-1.2MPa.
2. technique as claimed in claim 1, it is characterized in that, described tensio-active agent is cats product.
3. technique as claimed in claim 2, it is characterized in that, described cats product is free benzyl trimethyl ammonium chloride, dodecyl benzyl dimethyl ammonium chloride or distearyl dimethyl ammonium chloride.
4. technique as claimed in claim 1, it is characterized in that, described flocculation conditioning comprises the following steps: after hydro-thermal reaction completes, when temperature of reaction drops to 60-70 DEG C, flocculation agent 10-50kg is added by dewatered sludge per ton, in hydrothermal reaction kettle, add flocculation agent, stir, flocculation conditioning time is 30-60min.
5. technique as claimed in claim 4, it is characterized in that, described flocculation agent is made up of organic floculant and inorganic flocculating agent, organic floculant is selected from wheat stalk, maize straw, sugarcane stalk and/or wood chip, inorganic flocculating agent is selected from ironic hydroxide and/or aluminium hydroxide, and the mass ratio of organic floculant and inorganic flocculating agent is 1:2-1:5.
6. technique as claimed in claim 4, it is characterized in that, the particle diameter of described flocculation agent is 100-200 μm.
7. technique as claimed in claim 4, is characterized in that, first described flocculation agent is deployed into the suspension liquid that massfraction is 20-30%, then adds in hydrothermal reaction kettle.
8. technique as claimed in claim 1, it is characterized in that, described mechanical dehydration is belt press filtration.
9. technique as claimed in claim 1, it is characterized in that, described hydro-thermal reaction low whipping speed is carry out under the condition of 150-250r/min.
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Cited By (8)

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CN107089786A (en) * 2017-05-05 2017-08-25 昆明理工大学 A kind of method that utilization aluminium ash improves municipal sludge dehydrating effect
CN108409435A (en) * 2018-04-27 2018-08-17 福建龙马环卫装备股份有限公司 A kind of sludge aerobic compost method
CN108623119A (en) * 2017-03-21 2018-10-09 上海利泽环保科技有限公司 A method of improving sludge hot hydrolysis efficiency
CN109231790A (en) * 2018-10-15 2019-01-18 南京工业大学 A kind of hydrothermal carbonization strengthens the treatment process of printing and dyeing sludge dewatering
CN109293218A (en) * 2018-11-28 2019-02-01 沈阳航空航天大学 A kind of process of sludge dewatering
CN109574459A (en) * 2018-12-14 2019-04-05 上海交通大学 Improve the method for dewatering performance of sludge using segmentation microbubble ozone and surfactant co-conditioning
CN112209586A (en) * 2020-09-01 2021-01-12 浙江湖州金洁水务股份有限公司 Method for extracting COD from excess sludge
CN113354252A (en) * 2021-07-07 2021-09-07 浙江桃花源环保科技有限公司 Novel sludge drying conditioner and preparation method thereof

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CN108623119A (en) * 2017-03-21 2018-10-09 上海利泽环保科技有限公司 A method of improving sludge hot hydrolysis efficiency
CN108623119B (en) * 2017-03-21 2021-05-04 上海利泽环保科技有限公司 Method for improving sludge pyrohydrolysis efficiency
CN107089786A (en) * 2017-05-05 2017-08-25 昆明理工大学 A kind of method that utilization aluminium ash improves municipal sludge dehydrating effect
CN107089786B (en) * 2017-05-05 2020-10-27 昆明理工大学 Method for improving municipal sludge dewatering effect by using aluminum ash
CN108409435A (en) * 2018-04-27 2018-08-17 福建龙马环卫装备股份有限公司 A kind of sludge aerobic compost method
CN109231790A (en) * 2018-10-15 2019-01-18 南京工业大学 A kind of hydrothermal carbonization strengthens the treatment process of printing and dyeing sludge dewatering
CN109293218A (en) * 2018-11-28 2019-02-01 沈阳航空航天大学 A kind of process of sludge dewatering
CN109574459A (en) * 2018-12-14 2019-04-05 上海交通大学 Improve the method for dewatering performance of sludge using segmentation microbubble ozone and surfactant co-conditioning
CN109574459B (en) * 2018-12-14 2020-09-15 上海交通大学 Method for improving sludge dewatering performance by utilizing combined conditioning of segmented microbubble ozone and surfactant
CN112209586A (en) * 2020-09-01 2021-01-12 浙江湖州金洁水务股份有限公司 Method for extracting COD from excess sludge
CN113354252A (en) * 2021-07-07 2021-09-07 浙江桃花源环保科技有限公司 Novel sludge drying conditioner and preparation method thereof

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