CN104098250A - Municipal sludge two-stage deep dehydration method combining chemical regulation strengthening preliminary mechanical dehydration and electroosmosis - Google Patents

Municipal sludge two-stage deep dehydration method combining chemical regulation strengthening preliminary mechanical dehydration and electroosmosis Download PDF

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CN104098250A
CN104098250A CN201310737708.0A CN201310737708A CN104098250A CN 104098250 A CN104098250 A CN 104098250A CN 201310737708 A CN201310737708 A CN 201310737708A CN 104098250 A CN104098250 A CN 104098250A
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sludge
dehydration
mud
dewatering
composite conditioner
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CN201310737708.0A
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CN104098250B (en
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杨家宽
鄢金松
梁莎
麦亚强
虞文波
时亚飞
张诗楠
宋健
张昊
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北京亿维德曼科技发展有限公司
华中科技大学
柳州市德缘科技开发有限责任公司
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Abstract

The invention relates to a municipal sludge deep dehydration composite conditioner and a dehydration method, the composite conditioner accounting for 3-30% by dry basis weight of sludge is added for conditioning modification of domestic sewage treatment plant concentrated sludge with the moisture content of about 97% to improve sludge preliminary mechanical dehydration and subsequent electroosmosis dehydration ability; the moisture content of the preliminarily dehydrated conditioned modified sludge is reduced to 70-85%; the preliminarily dehydrated sludge directly enters into electroosmosis dehydration equipment for deep dehydration, the moisture content of the sludge is reduced to 40 to 60%, landfill disposal, thermal conversion, use as building materials and other treatment, dispose and resource utilization can be directly carried out. The method can realize the continuous operation of sludge dehydration, is high in treatment efficiency, can effectively reduce the bound water content of the sludge, is good in dehydration effect, and low in moisture content of deeply dehydrated sludge cake, and is suitable for a newly-constructed sewage treatment plant and design requirements of reconstruction, expansion and contingency plans of sludge dehydration treatment of a sewage treatment plant in the prior art.

Description

Preliminary mechanical dehydration associating osmosis two-stage deep dehydration method is strengthened in a kind of municipal sludge chemical conditioning
Technical field
The present invention relates to a kind of municipal sludge chemical conditioning and strengthen preliminary mechanical dehydration-osmosis two-stage deep dehydration novel method, belong to town sewage discharge sludge treatment and disposal technology field, be the novel process of processing and the disposal of urban wastewater treatment firm excess sludge, meet sludge reduction, stabilization, innoxious requirement.
Background technology
The technique of China's town sewage treatment facility still be take biological process as main, in processing the process of waste water, can produce a large amount of excess sludges.According to the ASSOCIATE STATISTICS of house and the < < of town and country construction portion China's urban drainage and sewage disposal condition communique 2006-2010 > >, 2010 national dewatered sludge (water ratio is in 80%) ultimate production approach 2,200 ten thousand tons.< < China sludge treatment is disposed Market Report (2011 editions) > > and is pointed out, at 2015 end of the years, China's dewatered sludge annual production will be over 2,600 ten thousand tons.
Mud is with extracellular polymeric (Extracellular Polymeric Substances, be called for short EPS) be the organic aggregate of wetting ability of skeleton, contain abundant organic matter, also contain a large amount of pathogenic bacterias, the venomous injurant of parasite (ovum), heavy metal, salt and difficult degradation.In mud, the formed a large amount of wetting ability mud flco structures of EPS are focuses that sludge dewatering research is paid close attention to.Because organic content in mud is high, particle is tiny, EPS wetting ability is strong, specific surface area large, the characteristic of strong rubber body structure has caused the compressible performance of mud poor, in the later stage of filtering, can stop up the hole of filter cake, the filtration channel that has blocked water, cause current mechanical dehydration efficiency lower, dehydration difficulty.
In sludge dewatering difficulty and mud, the existence form of water has much relations, generally the water in mud can be divided into free water (Free Water) and in conjunction with the large class of water (Bound Water) two.The moisture of free water for can unrestricted flow in mud not affected by solid particulate, accounts for 70%; In conjunction with water, be to be subject to the existence of solid particulate to affect the moisture of its performance, account for 30%, comprise capillary water, planar water and granule interior water (seeing Fig. 1).It has been generally acknowledged that, in mud, free water content is the upper limit of mechanical sludge dewatering.So, how effectively to change the combination water in mud into a gordian technique difficult problem that free water is sludge treatment and disposal technology.
Therefore, for improving dewatering performance of sludge, as mechanical sludge dewatering is last, need to adopt physico-chemical process to nurse one's health, change the combination of water in mud, improve the hydrophilic-structure of mud EPS, thereby improve sludge dewatering efficiency.
At present, the dewatering technology of mud that most domestic sewage work adopts is with polyacrylamide (PAM) polymeric flocculant conditioning mud, after centrifuge dehydration or belt type filter-pressing dehydration plant, only can obtain the dehydrated sludge cake of water ratio 80% left and right.Although this technique can meet the requirement that in < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002), mechanical dehydration moisture percentage in sewage sludge is less than 80%, cannot meet mud mixing landfill water ratio≤60% requiring in < < urban wastewater treatment firm sludge disposal mixing landfill shale > > (CJ/T249-2007).Also cannot meet general office of national environmental protection portion ring and do [2010] No. 157 documentation requirements " sewage work take storage (not processing disposal) and mud transported to factory circle as object, must by sludge dewatering to water ratio below 50% ".
Chinese patent literature < < inorganic composite sludge dehydration conditioner and application > > (publication number CN101851053A) thereof disclose a kind of conditioner for sludge dehydration and Opsonizing method, be specially and add sludge conditioner (Sodium dodecylbenzene sulfonate and sodium hydroxide) the conditioning mud that accounts for mud butt weight 10100%, with plate-and-frame filter press, conditioning mud is dewatered, but can only obtain water ratio 70-75% dewatered sludge.
Chinese patent literature < < mud is concentrated, dehydration treatment method > > (publication number CN102617013A) discloses a kind of conditioner for sludge dehydration and Opsonizing method, in the excess sludge that to be specially at water ratio be 99%, add the polyacrylamide conditioning mud that accounts for mud dry weight 0.3%, conditioning mud is concentrated; Toward adding in mud after concentrated, account for the unslaked lime of mud dry weight 15% and 5% polymerize aluminum chloride is done further conditioning to mud again, then adopt barrier film plate-and-frame filter press to carry out press filtration to conditioning mud, after dehydration, moisture content of the cake can be down to below 60%.
Chinese patent literature < < conditioner for sludge dehydration and Opsonizing method > > (publication number CN102001814A) disclose a kind of amendment and Opsonizing method of sludge dewatering, be specially the sewage work's dewatered sludge to water ratio 80%, quality by 1: 1.1 stirs than thin up, adds the conditioning medicament (comprising molysite, unslaked lime, coal gangue and potassium permanganate) that accounts for pending mud dry weight 30-60%.After conditioning, by high pressure plate-and-frame filter press (pressure 6.5MPa), dewater, moisture content of the cake can be down to below 60%.
As mentioned above, conventional deep sludge dewatering process is nursed one's health modification to mud at present, then by plate-and-frame filter press, mud is carried out to deep dehydration.But this method has following several drawback: the one, and mechanical floor space is larger, needs to build separately the auxiliary facilities such as factory building, so initial investment expense is more; The 2nd, plate-and-frame filter press dehydration is step, can not enter continuously mud dehydration, so dewatering efficiency is lower; The 3rd, if take the existing dewatered sludge of sewage work (water ratio 80% left and right) as processing object, conventionally need thin up mud (water ratio 90% left and right), the inorganic conditioner adding could be even with sludge agitation, but this way is the waste to water resources and dewatering process; The 4th, obtain good dehydrating effect, need to add a large amount of inorganic conditioner, be generally the more than 30% of mud dry weight, cause mud cake increase-volume weightening finish, strengthened the cost of follow-up disposal; The 5th, if contain unslaked lime in amendment, dehydration filtrate must be high alkalinity, and pH reaches more than 12, and filtrate is back to Sewage Plant without independent disposal can affect microbic activity in sewage work.
People are existing for a long time to the research of osmosis technology, and 20 beginnings of the century, fritz uses electroosmotic dewatering technology the earliest in the dehydration of mud coal.Afterwards, osmosis technology is mainly used in the original position reparation of soil, mainly removes heavy metal and organic pollutant in soil.In recent decades, along with becoming increasingly conspicuous of municipal sludge problem, there is researchist just this technology to be applied in the dehydration of mud.
Mechanical dehydration has essence different from electroosmotic dewatering mechanism.Mechanical dehydration is by mud being applied to certain mechanical pressure, makes the moisture in mud pass through filtration medium, and mud granule is trapped, and has therefore realized the separation of muddy water in mud.But the mud organic substance content that biological treatment produces is high, in dehydration, near particle layer filtration medium is subject to the effect of hydrodynamicpressure and closely knit gradually, causes filtration channel to stop up gradually, and filtration velocity reduces.
And in electroosmotic dewatering process, under the effect of electrical forces, electronegative mud granule moves to positive pole, the aqueous solution of positively charged moves to negative pole, therefore, near the porosity in electroosmotic dewatering process filtration medium is unaffected, there will not be the phenomenon of plugged filtration media filter cloth.
In electroosmotic dewatering process, generally use Helmholtz-Smo1uchowski (H-S) equation to represent the liquid flow rate being driven by electro-osmotic effects, the electroosmotic dewatering effect of reflection mud.Affect the character that mainly comprises mud itself of electroosmotic dewatering effect as the viscosity of the specific inductivity of zeta current potential, specific conductivity, liquid and liquid medium.Simultaneously also to consider the parameter of extra electric field, as voltage gradient etc.So the characteristic that can change by the method for chemical modification mud improves the electroosmotic dewatering effect of mud.
Electroosmotic dewatering technique, patented technology mainly concentrates on osmosis equipment aspect, less about the research of electroosmotic dewatering technique.Mainly at present that to take sewage work's dewatered sludge that water ratio is 80% be research and experimental subjects, carry out electroosmotic dewatering, because sewage work's dewatered sludge has only added polymeric flocculant conditioning mud, for electroosmotic dewatering technique, mud is not carried out to modification, so it is unsatisfactory directly dewatered sludge to be carried out to osmosis deep dehydration effect.Simultaneously, in the Patents technology of sludge dewatering, there is no by the New Process Introduction of osmosis deep dehydration technique and the original preliminary mechanical dehydration technology compound use of Sewage Plant also do not have simultaneously for improving the preliminary mechanical dehydration of mud and the mud combined cooker method of follow-up electroosmotic dewatering ability and the patent Introduction of deep dehydration technique.
Summary of the invention
One of object of the present invention is to provide a kind of composite conditioner for municipal sludge deep dehydration, comprise one or more in flocculation agent, coagulating agent and coagulant aids, also comprise inorganic salts, its weight percent is 5095%, surplus is one or more in flocculation agent, coagulating agent and coagulant aids, wherein, the weight percent of flocculation agent is no more than 1%.Described composite conditioner is comprised of according to aforementioned proportion is compound said components.Described inorganic salts is one or more in sylvite, sodium salt, calcium salt, magnesium salts, mantoquita, molysite, aluminium salt, zinc salt, ammonium salt, manganese salt, barium salt.Described flocculation agent and coagulating agent are one or more in sodium polyacrylate, polyacrylamide, poly styrene sulfonate, polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, PAFS.Described coagulant aids is one or more in lime, diatomite, flyash, terra alba.
In described composite conditioner, flocculation agent, coagulating agent and coagulant aids adds the mechanical dehydration ability that can improve mud.In flocculation agent there is bridging action in the macromolecular chain of polymkeric substance in sludge suspension particle, by different segments on polymer molecule, is adsorbed on variable grain, promotes the mutual gathering of mud granule.In described composite conditioner, flocculation agent adds in order to coordinate the existing dehydration equipment of sewage work carry out mud preliminary hydro-extraction and use, the words that mud particle diameter is too little, can not carry out mud-water separation by centrifuge dewatering equipment, so need to add a certain amount of flocculation agent, flocculence (charge neutrality and adsorption bridging effect) by flocculation agent, the binding property effect of chemistry (machinery, the physics and) and thickening property (catching effect of net) become greatly flco, then enter the mechanical dewatering equipment such as centrifugal and carry out preliminary mud-water separation.Coagulating agent add be for provide positive charge go in and the negative electricity on mud granule surface, make mud granule " de-steady ", so, between particle by effects such as collision, surface adsorption, Van der Waals forces, interosculate and become large, thereby the hydrophilic electronegative double electrical layers on compression mud granule surface, is conducive to the release in conjunction with water.Coagulant aids add the coagulation effect that can improve mud and the compressibility of improving mud cake.
In described composite conditioner, inorganic salts is sylvite, sodium salt, calcium salt, magnesium salts, mantoquita etc., coagulating agent and coagulant aids add the salinity that can improve mud, the specific conductivity of mud increases, under constant voltage gradient, current density in the saturating dehydration of sludge electroosmotic rises, and can improve the electroosmotic dewatering efficiency of mud.Due to the double electrical layers of mud granule, in mud granule surface meeting adsorption medium, the ion of oppositely charged forms electrostatic double layer.Under electric field action, the positively charged ion of Sludge Surface absorption attracts to movable cathode because being subject to electric power, and along with the movement in positively charged ion frictional belt, the water molecules in mud is carried out, and result is that in mud, part is removed under electrical forces effect in conjunction with water.
According to composite conditioner of the present invention, owing to containing one or more of inorganic salts and flocculation agent, coagulating agent and coagulant aids simultaneously, not only possess the effect that improves preliminary mechanical dehydration efficiency, possess the double effects that improves follow-up osmosis deep dehydration efficiency simultaneously.
Another object of the present invention is to provide a kind of method that adopts above-mentioned composite conditioner to carry out municipal sludge deep dehydration, adopt chemical conditioning to strengthen preliminary mechanical dehydration in conjunction with osmosis two-stage deep dehydration, be intended to solve the existing dehydration technique of existing sewage work and moisture percentage in sewage sludge can not be dropped to national specified requirement, and all disadvantages of existing deep dehydration technique existence.Meanwhile, the present invention is especially applicable to the reconstruction of existing sludge of sewage treatment plant processing aspect, the design requirements of enlarging and emergency preplan.
According to dewatering of the present invention, comprise the following steps:
(1) adopt above-mentioned composite conditioner to nurse one's health modification to described municipal sludge.Described conditioning modification particularly refers to, the composite conditioner of doses is made into the aqueous solution or suspension joins in modification conditioning tank, with the abundant hybrid reaction of described municipal sludge, obtains the conditioning mud that modification is good after certain hour.Composite conditioner possesses the effect that improves the preliminary mechanical dehydration efficiency of mud, possesses the double effects that improves follow-up osmosis deeply dehydrating sludge efficiency simultaneously.Described composite conditioner is added to water wiring solution-forming or suspension, and composite conditioner butt dosage is 3~30% of thickened sludge butt weight.
Before this step, can also comprise concentration step, the residual active sludge that is 99% left and right to water ratio carries out concentration, obtains the thickened sludge that water ratio is 97% left and right, and thickened sludge is delivered in sludge conditioning pond or sludge conditioning tank.
(2) utilize mechanical dewatering equipment to modification after mud carry out preliminary hydro-extraction, obtaining water ratio is 70~85% preliminary mechanical dehydration mud.The conditioning mud that modification is good is transported to the preliminary mechanical dewatering equipment of mud of sewage work by sludge transportation equipment, conditioning mud is carried out to preliminary mechanical dehydration, and obtaining water ratio is 70~85% preliminary mechanical dehydration mud.
(3) utilize electroosmotic dewatering equipment to carry out deep dehydration to preliminary hydro-extraction mud, obtaining water ratio is 40~60% deep dehydration mud again.The electroosmotic dewatering device that after described preliminary hydro-extraction, mud can be delivered to Programmable and Variable by one or more handling equipments such as worm conveyor, rotary conveyors carries out osmosis deep dehydration.In this step, can also comprise by technology such as biological deodorizing, charcoal absorptions the saturating deep dehydration process of sludge electroosmotic is carried out to deodorizing processing.
Further, can require according to the disposal of mud the water ratio of regulation depth dewatered sludge.Concrete, while requiring dewatered sludge water ratio to drop to 40~50%, the voltage gradient in the time of can improving the dehydration of osmosis device, and the residence time in sludge dewatering process.And while requiring dewatered sludge water ratio to drop to 50~60%, the voltage gradient in the time of can reducing the dehydration of osmosis device, and the residence time in sludge dewatering process.
Preliminary mechanical dehydration mud is transported to program-controlled electric permeating and dewatering machine by sludge transportation equipment and carries out osmosis deep dehydration, and obtaining water ratio is 40~60% deep dehydration mud
(4) sludge cake after deep dehydration is carried out to subsequent disposal and disposal.Deep dehydration mud can directly carry out landfill disposal, or carries out burning disposal, or prepares building materials, or pyrolysis, gasification etc. are processed and disposed and recycling.
In above-mentioned steps, mud preliminary hydro-extraction filtrate is back to sewage work's sewage treatment unit.
The present invention's effect that has the following advantages:
1, the sludge conditioner using in this deeply dehydrating sludge novel method is composite conditioner, comprise inorganic salts, flocculation and coagulating agent etc. one or more, composite conditioner possesses the effect that improves preliminary mechanical dehydration efficiency, possesses the double effects that improves follow-up osmosis deep dehydration efficiency simultaneously.
2, because dehydration motivating force and the traditional filtering of osmosis generation are entirely different, therefore the damage of filtration medium is little in electroosmotic dewatering process, substantially there will not be eyelet latch up phenomenon.
3, the water ratio of the preliminary mechanical dehydration mud in this sludge dewatering method can be reduced to 70~85%, the water ratio of degree of depth electroosmotic dewatering mud can be reduced to 40~60%, by adjusting the working parameter (voltage and dewatering time) of composition, dosage and the electroosmotic dewatering equipment of composite conditioner, realize the regulation and control of preliminary mechanical dehydration moisture percentage in sewage sludge and degree of depth electroosmotic dewatering moisture percentage in sewage sludge, can adapt to follow-up different sludge treatment and dispose or recycling mode.
4, for filter press dehydration equipment, in this sludge dewatering method, electroosmotic dewatering plant area area is less, does not need to build separately factory building, and level of automation is higher, and routine maintenance is simple, can realize the continuous operation of sludge dewatering, and processing efficiency is high.
5, in this sludge dewatering method, preliminary mechanical dehydration mainly removes free water, the combination water of osmosis in can effective elimination mud, and dehydrating effect is good, and deep dehydration moisture content of the cake is low.
6, this sludge dewatering method is applicable to newly-built sewage work.
7, this sludge dewatering method is suitable for the reconstruction of existing sludge of sewage treatment plant processed, the design requirements of enlarging and emergency preplan, can, when retaining the original device for dehydrating sladge waste of sewage work, add osmosis deep dehydration equipment moisture percentage in sewage sludge can be down to 40~60%.
8, in this sludge dewatering method, before mud solid content and conditioning, without obviously increasing, dehydrated sludge can directly be carried out landfill disposal, or carries out burning disposal, or prepares building materials, or pyrolysis, gasification etc. are processed and disposed and recycling.
Accompanying drawing explanation
Fig. 1 is the existence form of 4 kinds of water in mud.
Fig. 2 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
The Guangxi sanitary sewage disposal factory pre-concentration mud of take is example, and the indexs such as water ratio, organic content, sludge specific resistance, capillary water absorbing time of measuring thickened sludge are as table 1:
The characteristic index of table 1 thickened sludge
Embodiment 1
First the residual active sludge that is 99.2% by sewage work's water ratio is transported in sludge thickener by spiral pump, by gravity concentration, obtains the thickened sludge of water ratio 96.8%.Thickened sludge is transported in sludge conditioning pond by spiral pump, adds the composite conditioner that is roughly equal to mud butt weight 4.5%.Controlling agitator motor operating frequency in conditioner is 30Hz, stirs 20min, obtains the conditioning mud that modification is good.Conditioning mud is delivered to belt filter press by spiral pump and carries out preliminary hydro-extraction, obtain the preliminary hydro-extraction mud of the soft shape of water ratio 75.4%, the dehydration filtrate in preliminary hydro-extraction process is back to the sewage treatment unit of sewage work.
Then the preliminary hydro-extraction mud of water ratio 75.4% is delivered to electroosmotic dewatering equipment with worm conveyor and carries out deep dehydration, carry out deodorizing processing simultaneously, electroosmotic dewatering equipment work voltage is set as 76V, dewatering time is 10 minutes, after osmosis deep dehydration, moisture percentage in sewage sludge reduces to 54.2%, and osmosis deep dehydration filtrate is back to the sewage treatment unit of sewage work.With rotary conveyor, granular deep dehydration mud is delivered to natural air dryer, moisture percentage in sewage sludge 44.6% after air-dry, finally by air-dry mud, auxiliary agent, in the ratios of 5: 5, be delivered to kneading machine moulding and make sludge fuel, measuring propellant combination calorific value is 3500kcal/kg, reach brown coal calorific value, electric power supply plant and Thermal Corp are used.
Embodiment 2
First the residual active sludge that is 99.4% by sewage work's water ratio is transported in sludge thickener by spiral pump, by gravity concentration, obtains the thickened sludge of water ratio 97.3%.Thickened sludge is transported in sludge conditioning pond by spiral pump, adds the composite conditioner that is roughly equal to mud butt weight 25.4%.Controlling agitator motor operating frequency in conditioner is 30Hz, stirs 20min, obtains the conditioning mud that modification is good.Conditioning mud is delivered to whizzer by spiral pump and carries out preliminary hydro-extraction, obtain the preliminary hydro-extraction mud of the soft shape of water ratio 72.6%, the dehydration filtrate in preliminary hydro-extraction process is back to the sewage treatment unit of sewage work.
Then the preliminary hydro-extraction mud of water ratio 75.6% is delivered to electroosmotic dewatering equipment with rotary conveyor and carries out deep dehydration, carry out deodorizing processing simultaneously, electroosmotic dewatering equipment work voltage is set as 80V, dewatering time is 10 minutes, after osmosis deep dehydration, moisture percentage in sewage sludge reduces to 40.8%, and osmosis deep dehydration filtrate is back to the sewage treatment unit of sewage work.With rotary conveyor, granular deep dehydration mud is delivered to natural air dryer, moisture percentage in sewage sludge 36.2% after air-dry, finally by air-dry mud, auxiliary agent, in the ratios of 5: 5, be delivered to kneading machine moulding and make sludge fuel, measuring propellant combination calorific value is 3800kcal/kg, reach brown coal calorific value, electric power supply plant and Thermal Corp are used.
Embodiment 3
First the residual active sludge that is 99.3% by sewage work's water ratio is transported in sludge thickener by spiral pump, by gravity concentration, obtains the thickened sludge of water ratio 96.6%.Thickened sludge is transported in sludge conditioning pond by spiral pump, adds the composite conditioner that is roughly equal to mud butt weight 9.4%.Controlling agitator motor operating frequency in conditioner is 30Hz, stirs 20min, obtains the conditioning mud that modification is good.Conditioning mud is delivered to whizzer by spiral pump and carries out preliminary hydro-extraction, obtain the preliminary hydro-extraction mud of the soft shape of water ratio 75.5%, the dehydration filtrate in preliminary hydro-extraction process is back to the sewage treatment unit of sewage work.
Then the preliminary hydro-extraction mud of water ratio 75.5% is delivered to electroosmotic dewatering equipment with rotary conveyor and carries out deep dehydration, carry out deodorizing processing simultaneously, electroosmotic dewatering equipment work voltage is set as 78V, dewatering time is 10 minutes, after osmosis deep dehydration, moisture percentage in sewage sludge reduces to 45.8%, and osmosis deep dehydration filtrate is back to the sewage treatment unit of sewage work.Osmosis deep dehydration mud is hauled out to plant area and carry out landfill disposal.
The foregoing is only preferred embodiment of the present invention, the residual active sludge of the most difficult dehydration that the present invention discharges mainly for sanitary sewage disposal factory second pond, the residual active sludge of second pond being discharged for some sewage work is equally applicable to patent of the present invention with the mixing sludge of the primary sludge composition that preliminary sedimentation tank is discharged.Patent of the present invention, mainly for the municipal sludge of sanitary sewage disposal factory discharge, is equally applicable to patent of the present invention for other difficult paper mill sludge dewatering, greasy filth etc.Not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (8)

1. the composite conditioner for municipal sludge deep dehydration, its plural components comprises one or more in flocculation agent, coagulating agent and coagulant aids, it is characterized in that: also comprise inorganic salts, its weight percent is 50-95%, surplus is one or more in flocculation agent, coagulating agent and coagulant aids, wherein, the weight percent of flocculation agent is no more than 1%.
2. composite conditioner as claimed in claim 1, is characterized in that: described inorganic salts is one or more in sylvite, sodium salt, calcium salt, magnesium salts, mantoquita, molysite, aluminium salt, zinc salt, ammonium salt, manganese salt, barium salt.
3. composite conditioner as claimed in claim 1, is characterized in that: described flocculation agent and coagulating agent are one or more in sodium polyacrylate, polyacrylamide, poly styrene sulfonate, polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, PAFS.
4. composite conditioner as claimed in claim 1, is characterized in that: described coagulant aids is one or more in lime, diatomite, flyash, terra alba.
5. the arbitrary composite conditioner of employing as described in claim 1-4 carries out a method for deep dehydration to municipal sludge, it is characterized in that comprising the following steps:
(1) adopt arbitrary composite conditioner as described in claim 1-4 to as described in municipal sludge nurse one's health modification;
(2) utilize mechanical dewatering equipment to modification after mud carry out preliminary hydro-extraction, obtaining water ratio is 70~85% preliminary mechanical dehydration mud;
(3) utilize electroosmotic dewatering equipment to carry out deep dehydration to preliminary hydro-extraction mud, obtaining water ratio is 40~60% deep dehydration mud again;
(4) sludge cake after deep dehydration is carried out to subsequent disposal and disposal.
6. dewatering as claimed in claim 1, is characterized in that: in (1) step, composite conditioner is added to water wiring solution-forming or suspension, composite conditioner butt dosage is 3~30% of thickened sludge butt weight.
7. dewatering as claimed in claim 1, it is characterized in that: in (3) step, also comprise set-up procedure, change dehydration voltage and the residence time of mud in electroosmotic dewatering equipment of electroosmotic dewatering equipment, adjust the dehydrating effect of deeply dehydrating sludge.
8. dewatering as claimed in claim 1, is characterized in that also comprising the steps before (1) step, and the residual active sludge that is 99% left and right to water ratio carries out concentration, obtains the thickened sludge that water ratio is 97% left and right.
CN201310737708.0A 2013-12-30 2013-12-30 A kind of municipal sludge chemical conditioning strengthening preliminary mechanical dehydration associating electro-osmosis two-stage deep dehydration method CN104098250B (en)

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CN107814474A (en) * 2017-09-12 2018-03-20 浙江山海建设有限公司 The processing method of riverway sludge
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CN108931563A (en) * 2018-05-02 2018-12-04 华中科技大学 The method for aoxidizing conditioning dewatering performance of sludge based on oxidation-reduction potential Fast Evaluation
CN109179927A (en) * 2018-09-20 2019-01-11 重庆三峡学院 A kind of method of the circulating processing of excess sludge
CN109179964A (en) * 2018-10-12 2019-01-11 安徽润道生态环境工程科技有限公司 A kind of sludge mud-water separation material of resourcebility and its application
CN109626795A (en) * 2019-01-18 2019-04-16 宝钢湛江钢铁有限公司 A kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation
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