CN103466915B - For composition and the dewatering of municipal sludge deep dehydration - Google Patents

For composition and the dewatering of municipal sludge deep dehydration Download PDF

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CN103466915B
CN103466915B CN201310401721.9A CN201310401721A CN103466915B CN 103466915 B CN103466915 B CN 103466915B CN 201310401721 A CN201310401721 A CN 201310401721A CN 103466915 B CN103466915 B CN 103466915B
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component
composition
mass parts
deep dehydration
sludge
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CN103466915A (en
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范力仁
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范力仁
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Abstract

The invention discloses a kind of composition for municipal sludge deep dehydration, it comprises the component of following mass fraction: component, 1:0.04 ~ 0.10 mass parts, component 2:0.04 ~ 0.06 mass parts and component 3:0.84 ~ 0.92 mass parts, amounts to 1 mass parts; Comprise pH value regulator in component 1, comprise gel breaker in component 2, component 3 comprises dewatering agent; PH value regulator is acid or alkali; Gel breaker is polar organic matter, and institute's dewatering agent is mineral salt.When deep dehydration being carried out to municipal sludge by said composition, first get wet mud 1 mass parts, at 10 DEG C ~ 50 DEG C temperature and normal pressure, add composition 0.5 ~ 3 mass parts to carry out mixing brokenly glue conditioning, carrying out machinery in conditioning process mixes mixed, then solid-liquid separation, until wet moisture percentage in sewage sludge is down to 50% ~ 30%.The present invention have pollution-free, do not reduce organic content in mud, energy consumption is low, filtered liquid is reusable, low cost and other advantages.

Description

For composition and the dewatering of municipal sludge deep dehydration
Technical field
The invention belongs to environmental protection technical field, particularly relate to a kind of composition for deeply dehydrating sludge and dewatering.
Background technology
China's town sewage plant generally adopts mechanical system to dewater to mud, and dewatered sludge water ratio, generally 77% ~ 83%, in pseudo-gels state, is referred to as " wet mud ".Wet moisture percentage in sewage sludge is high, and organic content is high, and heavy metal content is higher, and germ, parasite (ovum) content are high.If wet mud, without minimizing and harmless treatment, is thrown aside arbitrarily, simple landfill, easy polluted air, soil and water source, serious threat HUMAN HEALTH and environmental safety.So the wet mud of sewage work must carry out minimizing, innoxious, stabilization, recycling treatment and disposal.
Solve the wet specific resistance to filtration problem of sewage work, first Gonna breakthrough wets the technical bottleneck of mud low cost deep dehydration, its water ratio is down to less than 60% by about 80%, realizes minimizing, otherwise be difficult to realize recycling.
CN102408178A Chinese patent literature discloses a kind of method of deeply dehydrating sludge, comprising: a. by thickened sludge acid for adjusting pH value to 2.5 ~ 3.5; B. add molysite, add H 2o 2or rapid stirring after Peracetic Acid; C. add framework material, sludge pH is adjusted to 6.8 ~ 7.2; D. sludge dewatering.The content of this technical scheme mainly contains 3 points: add chemical reagent after adjust pH, add framework material, recalls to mechanical dehydration after pH value; Its shortcoming to consume soda acid, chemical reagent, needs again to add inorganic skeleton material, reduce mud organic content, also needs to carry out mechanical dehydration.CN102432153A Chinese patent literature discloses a kind of preparation method of magnetic deep sludge dehydration composite modifier, and it is with nano-magnetic Fe 3o 4, anionic polyacrylamide (PAM) and dimethyl diallyl ammonium chloride (DADMAC) be raw material, prepared a kind of magnetic sludge properties-correcting agent for deeply dehydrating sludge.Can recycle after the dehydration of this properties-correcting agent, just sludge dewatering limited efficiency, sludge dewatering cost is high.CN102795755A Chinese patent literature discloses one " deep dehydration system for sludge and deep dehydration method for sludge ", and it carries out modifier treatment by adding flocculation agent to mud, then carries out mechanical dehydration process.CN102358679A Chinese patent literature discloses a kind of sludge conditioner and uses this amendment to carry out the method for deep dehydration to mud, it cooks sludge conditioner by solid waste, this sludge conditioner by weight percent be 40% ~ 70% magnesia and weight percent be 30% ~ 60% Wingdale pulverize after make after 900 DEG C ~ 1000 DEG C calcination 1h ~ 2h; Use the deep dehydration method of this sludge conditioner that moisture percentage in sewage sludge can be made to be reduced to less than 60% fast, but shortcoming is the content significantly reducing mud organic matter.CN103073170A Chinese patent literature discloses a kind of deep dehydration method for sludge based on magnetic super strength water absorbent, and it adopts brokenly glue to nurse one's health mud and is combined with colloid dewatering agent and carries out deep dehydration.
All in all, around deeply dehydrating sludge, the published patent documentation of China has and describes and relate to, itself or adopt high-pressure machinery power and heating power to carry out forced dehydration, energy consumption is high, and effect is undesirable; Or employing chemical agent, flocculation agent carry out modified, then carry out mechanical forced dehydration, chemical agent can not recirculation utilize; Or add a large amount of framework material inorganics, reduce organic content in mud, its recycling is worth and has a greatly reduced quality.Existing deep dehydration method for sludge need further Improvement and perfection.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, there is provided a kind of pollution-free, do not reduce organic content in mud, energy consumption is low, filtered liquid is reusable, cost the is low composition for municipal sludge deep dehydration, a kind of simple to operate, practical, dewatering that can realize mud fast dewatering is also provided.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of composition for municipal sludge deep dehydration, and described composition comprises the component of following mass fraction:
Component 1:0.04 ~ 0.10 mass parts,
Component 2:0.04 ~ 0.06 mass parts, and
Component 3:0.84 ~ 0.92 mass parts;
Said components 1, component 2 and component 3 amount to 1 mass parts; Wherein: component 1 comprises the pH value regulator that concentration is 5.0wt% ~ 20wt%, component 2 comprises the gel breaker that concentration is 0.5wt% ~ 3.0wt%, and it is 10wt% ~ 20wt% dewatering agent that component 3 comprises concentration;
Described pH value regulator is mainly acid or alkali; Described gel breaker is mainly polar organic matter, and described dewatering agent is mainly mineral salt.
In the above-mentioned composition for municipal sludge deep dehydration, the charged character of the effect of described component 1 mainly conditioning of mud colloidal solid, reduce intergranular repulsive force, the concentration of its pH value regulator in component 1 preferably adjusts within the scope of 10wt% ~ 15wt%, and component 1 proportion optimization 0.06 ~ 0.09 mass parts in the composition.Acid mainly refers to sulfuric acid, hydrochloric acid or phosphoric acid, also can use low molecular weight organic acid; Described alkali preferably uses inorganic hydroxide, as white lime, caustic soda etc.Concrete, those skilled in the art can according to the concrete composition of sludge source and character determination pH value regulator.
In the above-mentioned composition for municipal sludge deep dehydration, described component 2 is one of wet mud " pseudo-gels " structural damage persons, and the concentration of gel breaker in component 2 preferably adjusts within the scope of 1wt% ~ 2wt%.Described polar organic matter is preferably C 2-C 12organic acid salt, particularly preferably as sodium acetate, lime acetate etc.
In the above-mentioned composition for municipal sludge deep dehydration, preferably, the consumption of described component 3 is to be adjusted to the flow of water of composition lower than-3MPa(preferably-3.0MPa ~-3.5MPa) for control criterion (liquid or the material flow of water can adopt WP4 flow of water survey meter to measure), to make mud contained humidity deep dehydration in low flow of water field, reach desired water content requirement.Mineral salt is preferably one or both the mixture in calcium chloride, sodium-chlor, magnesium chloride etc.
As a total technical conceive, the present invention also provides a kind of method of with above-mentioned composition, municipal sludge being carried out to deep dehydration, comprise the following steps: get wet mud 1 mass parts, at 10 DEG C ~ 50 DEG C temperature and normal pressure, add described composition 0.5 ~ 3 mass parts to carry out mixing brokenly glue conditioning, carrying out machinery to wet mud and composition in conditioning process mixes mixed, and then carry out (mechanical type) solid-liquid separation, can measure with sludge water content analyser until wet moisture percentage in sewage sludge is down to 50% ~ 30%(moisture percentage in sewage sludge), complete processed.
In the technical scheme of the invention described above, material in the conditioning of mixing broken glue comprises wet mud and the above-mentioned water displacement composition of the present invention, the object that glue conditioning is broken in this mixing destroys mud pseudo-gels structure, the character of the wet mud of improvement, discharge most of mud pseudo-gels interstitial water, the mechanical solid-liquid making it follow-up is separated to become easily carries out, and then reaches the object to wet reducing sludge volume, minimizing.
In above-mentioned method, preferably, the suspended mixture obtained after broken for mixing glue conditioning is mainly carried out effective solid-liquid separation by the task that described mechanical solid-liquid is separated, and produces semi-dry sludge and dehydration diluted liquid, is preferably isolated by vacuum filtration method, press filtration partition method or centrifugal separation.
In above-mentioned method, preferably, containing " three doses " (i.e. pH value regulator, gel breaker and dewatering agent) material in dehydration diluted liquid after mechanical solid-liquid is separated, can again recycle as described composition after supplementing pH value regulator, gel breaker and/or dewatering agent.Semi-dry sludge after mechanical solid-liquid is separated may be used for compost, does low calorie fuels, the stopping composition etc. of soil improvement agent, matrix material.The liquid obtained through mechanical solid-liquid separation unit is dilution dewatering work thing, and it is after adding a certain amount of " three doses ", again can become again the dewatering work thing meeting deep dehydration requirement, recycle, reaches the object of the processing cost that economizes on resources, reduces.
In above-mentioned method, the wet moisture percentage in sewage sludge that described mixing is broken before glue conditioning is 75% ~ 83%, generally refers to by the product of sewage work after mechanical means dewaters, belongs to and be specially adapted to the object that the inventive method carries out deep dehydration.
Compared with prior art, the invention has the advantages that: two cell process that the present invention adopts " the broken glue conditioning of mixing---mechanical solid-liquid separation " are implemented stage by stage continuously, and the homemade water displacement composition dehydrating effect of the present invention is good, reusable edible.In addition, method of the present invention does not comprise the step such as high pressure dehydration and Thermal dehydration process, its water ratio can be down to 50% ~ 30%.In general, water displacement composition of the present invention and dewatering do not increase or adopt chemical harmful substance, the organic content in mud can not be reduced, the composition reusable edible of dehydration, can mud be made to carry out deep dehydration in comparatively less energy-consumption, pole reduction process cost situation, reach sludge reduction and follow-up object of carrying out utilization of waste material.
Embodiment
Below in conjunction with the concrete preferred embodiment of specification sheets, the invention will be further described, but protection domain not thereby limiting the invention.
embodiment 1:
A composition for municipal sludge deep dehydration of the present invention, said composition comprises the component of following mass fraction:
Component 1:0.04 mass parts,
Component 2:0.04 mass parts, and
Component 3:0.92 mass parts;
Amount to 1 mass parts; Wherein: component 1 comprises the pH value regulator that concentration is 5.0wt%; Component 2 comprises the gel breaker that concentration is 3.0wt%; It is 10wt% ~ 20wt% dewatering agent (flow of water of composition being adjusted to-3.0MPa for control criterion with mineral salt) that component 3 comprises concentration;
PH value regulator is mainly hydrochloric acid; Gel breaker is lime acetate, and mineral salt is mainly calcium chloride, reaches-3.0MPa by the flow of water of calcium chloride adjustment above-mentioned composition.
With the present embodiment above-mentioned composition, municipal sludge is carried out to the method for deep dehydration, comprise the following steps: 1 part, the wet mud getting water ratio 80%, add the above-mentioned composition of the present embodiment 1.5 parts, at 25 DEG C of temperature and normal pressure, mixed 6min ~ 10min mixed by machinery, obtains solid-liquid suspension mixture; Suspended mixture is imported vacuum filter, is filter in-0.05 ~-0.09MPa scope in negative pressure, collects filter cake (i.e. semi-dry sludge) and filtrate (dehydration diluted liquid) respectively; Filter cake moisture content about 50%.
Get the filtrate of filtrate total amount 60%, supplement and add above-mentioned " three doses " (pH value regulator, gel breaker and dewatering agent), make the content of " three doses " reach recipe requirements in above-mentioned composition, form fresh water displacement composition and enter next circulation and reuse.
embodiment 2:
A composition for municipal sludge deep dehydration of the present invention, said composition comprises the component of following mass fraction:
Component 1:0.10 mass parts,
Component 2:0.06 mass parts, and
Component 3:0.84 mass parts;
Totally 1 mass parts; Wherein: component 1 comprises the pH value regulator that concentration is 20wt%; Component 2 comprises the gel breaker that concentration is 0.5wt%; It is 10wt% ~ 20wt% dewatering agent (flow of water of composition being adjusted to-3.5MPa for control criterion with mineral salt) that component 3 comprises concentration;
PH value regulator is mainly sulfuric acid; Gel breaker is mainly sodium acetate, and mineral salt is mainly sodium-chlor, reaches-3.5MPa by the flow of water of sodium-chlor adjustment above-mentioned composition.
With the present embodiment above-mentioned composition, municipal sludge is carried out to the method for deep dehydration, comprise the following steps: 1 part, the wet mud getting water ratio 82%, add the above-mentioned composition of the present embodiment 3.0 parts, at 35 DEG C of temperature and normal pressure, mixed 1min mixed by machinery, obtains solid-liquid suspension mixture; Being imported by suspended mixture in plate-and-frame filter press, is carry out press filtration within the scope of 5MPa ~ 10MPa at pressure, collects filter cake (i.e. semi-dry sludge) and filtrate (dehydration diluted liquid) respectively; Filter cake moisture content about 30%.
Get the filtrate of filtrate total amount 65%, supplement and add above-mentioned " three doses " (pH value regulator, gel breaker and dewatering agent), make the content of " three doses " reach recipe requirements in above-mentioned composition, form fresh water displacement composition and enter next circulation and reuse.
embodiment 3:
A composition for municipal sludge deep dehydration of the present invention, said composition comprises the component of following mass fraction:
Component 1:0.08 mass parts,
Component 2:0.05 mass parts, and
Component 3:0.87 mass parts;
Component 1, component 2 and component 3 amount to 1 mass parts; Wherein: component 1 comprises the pH value regulator that concentration is 10wt%; Component 2 comprises the gel breaker that concentration is 2.0wt%; It is 10wt% ~ 20wt% dewatering agent (flow of water of composition being adjusted to-3.2MPa for control criterion with mineral salt) that component 3 comprises concentration;
PH value regulator is formulated by phosphoric acid; Gel breaker is mainly lime acetate, and mineral salt is mainly magnesium chloride, reaches-3.2MPa by the flow of water of magnesium chloride adjustment above-mentioned composition.
With the present embodiment above-mentioned composition, municipal sludge is carried out to the method for deep dehydration, comprise the following steps: 1 part, the wet mud getting water ratio 77%, add the above-mentioned composition of the present embodiment 1 part, at 10 DEG C of temperature and normal pressure, mixed 20min mixed by machinery, obtains solid-liquid suspension mixture; Suspended mixture is imported in whizzer, within the scope of 3000r/min ~ 4000r/min, carry out centrifugal solid-liquid separation, collect solid slag (i.e. semi-dry sludge) and clear liquid (dehydration diluted liquid) respectively; Solid slag water ratio about 40%.
Get the filtrate of filtrate total amount 65%, supplement and add above-mentioned " three doses " (pH value regulator, gel breaker and dewatering agent), make the content of " three doses " reach recipe requirements in above-mentioned composition, form fresh water displacement composition and enter next circulation and reuse.
embodiment 4:
A composition for municipal sludge deep dehydration of the present invention, said composition comprises the component of following mass fraction:
Component 1:0.10 mass parts,
Component 2:0.04 mass parts, and
Component 3:0.86 mass parts;
Component 1, component 2 and component 3 amount to 1 mass parts; Wherein: component 1 comprises the pH value regulator that concentration is 15.0wt%; Component 2 comprises the gel breaker that concentration is 2.5wt%; It is 10wt% ~ 20wt% dewatering agent (flow of water of composition being adjusted to-3.0MPa for control criterion with mineral salt) that component 3 comprises concentration;
PH value regulator is mainly sodium hydroxide; Gel breaker is mainly sodium acetate, and mineral salt is mainly calcium chloride, reaches-3.0MPa by the flow of water of calcium chloride adjustment above-mentioned composition.
With the present embodiment above-mentioned composition, municipal sludge is carried out to the method for deep dehydration, comprise the following steps: 1 part, the wet mud getting water ratio 80%, add the above-mentioned composition of the present embodiment 1.2 parts, at 25 DEG C of temperature and normal pressure, mixed 10min mixed by machinery, obtains solid-liquid suspension mixture; Suspended mixture is imported in whizzer, within the scope of 3000r/min ~ 4000r/min, carry out centrifugal solid-liquid separation, collect solid slag (i.e. semi-dry sludge) and clear liquid (dehydration diluted liquid) respectively; Solid slag water ratio about 45%.
Get the filtrate of filtrate total amount 65%, supplement and add above-mentioned " three doses " (pH value regulator, gel breaker and dewatering agent), make the content of " three doses " reach recipe requirements in above-mentioned composition, form fresh water displacement composition and enter next circulation and reuse.

Claims (7)

1. for a composition for municipal sludge deep dehydration, it is characterized in that, described composition comprises the component of following mass fraction:
Component 1:0.04 ~ 0.10 mass parts,
Component 2:0.04 ~ 0.06 mass parts, and
Component 3:0.84 ~ 0.92 mass parts;
Said components 1, component 2 and component 3 amount to 1 mass parts; Wherein: comprise the pH value regulator that concentration is 5.0wt% ~ 20wt% in component 1, comprise the gel breaker that concentration is 0.5wt% ~ 3.0wt% in component 2, it is 10wt% ~ 20wt% dewatering agent that component 3 comprises concentration;
Described pH value regulator is mainly acid or alkali; Described gel breaker is mainly polar organic matter, and described polar organic matter is sodium acetate or lime acetate; Described dewatering agent is mainly mineral salt, described mineral salt is one or both the mixture in calcium chloride, magnesium chloride, sodium-chlor, sodium sulfate, ammonium sulfate, and the flow of water of composition is adjusted to lower than-3MPa as control criterion with mineral salt by the consumption of described dewatering agent.
2. the composition for municipal sludge deep dehydration according to claim 1, is characterized in that, described acid is sulfuric acid, hydrochloric acid, phosphoric acid or low molecular weight organic acid, and described alkali is inorganic hydroxide; The concentration of described pH value regulator in component 1 is 10wt% ~ 15wt%, and component 1 proportioning is in the composition 0.06 ~ 0.09 mass parts.
3. the composition for municipal sludge deep dehydration according to claim 1 and 2, is characterized in that, the concentration of described gel breaker in component 2 is 1wt% ~ 2wt%.
4. one kind is carried out the method for deep dehydration to municipal sludge with the composition according to any one of claims 1 to 3, comprise the following steps: get wet mud 1 mass parts, at 10 DEG C ~ 50 DEG C temperature and normal pressure, add described composition 0.5 ~ 3 mass parts to carry out mixing brokenly glue conditioning, carrying out machinery to wet mud and composition in conditioning process mixes mixed, and then carry out solid-liquid separation, until wet moisture percentage in sewage sludge is down to 50% ~ 30%, complete deep dehydration process.
5. method according to claim 4, is characterized in that: the dehydration diluted liquid after mechanical solid-liquid is separated again recycles as described composition after supplementing pH value regulator, gel breaker and/or dewatering agent.
6. method according to claim 4, is characterized in that: the wet moisture percentage in sewage sludge that described mixing is broken before glue conditioning is 75% ~ 83%.
7. method according to claim 4, is characterized in that: described solid-liquid separation is isolated by vacuum filtration method, press filtration partition method or centrifugal separation.
CN201310401721.9A 2013-09-06 2013-09-06 For composition and the dewatering of municipal sludge deep dehydration Expired - Fee Related CN103466915B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106830621B (en) * 2017-02-27 2021-01-01 河海大学 Composite sludge dehydrating agent and preparation method and application thereof
CN110156300A (en) * 2019-05-29 2019-08-23 中清深利(深圳)科技有限公司 A kind of urban river sediment dehydrating and curing and resource utilization method
CN110590121A (en) * 2019-08-30 2019-12-20 中山大学 Sludge dehydrating agent and sludge dehydrating method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551831A (en) * 1978-06-19 1980-01-09 Kirin Brewery Co Ltd Excess sludge treating method
JPH07308700A (en) * 1994-05-19 1995-11-28 Nippon Kayaku Co Ltd Flocculant and method for dehydrating sludge
CN1621369A (en) * 2003-11-24 2005-06-01 曾智勇 Nano highly effective amendment for sludge dehydration
CN101580336A (en) * 2009-05-27 2009-11-18 中国石油天然气股份有限公司 Processing method of sludge containing oil and methanol

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551831A (en) * 1978-06-19 1980-01-09 Kirin Brewery Co Ltd Excess sludge treating method
JPH07308700A (en) * 1994-05-19 1995-11-28 Nippon Kayaku Co Ltd Flocculant and method for dehydrating sludge
CN1621369A (en) * 2003-11-24 2005-06-01 曾智勇 Nano highly effective amendment for sludge dehydration
CN101580336A (en) * 2009-05-27 2009-11-18 中国石油天然气股份有限公司 Processing method of sludge containing oil and methanol

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