CN105645729B - A kind of energy saving drying method of the sludge lower shrinkage based on solar energy - Google Patents
A kind of energy saving drying method of the sludge lower shrinkage based on solar energy Download PDFInfo
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- CN105645729B CN105645729B CN201610021874.4A CN201610021874A CN105645729B CN 105645729 B CN105645729 B CN 105645729B CN 201610021874 A CN201610021874 A CN 201610021874A CN 105645729 B CN105645729 B CN 105645729B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
A kind of energy saving drying method of the sludge lower shrinkage based on solar energy, it is characterised in that：Puffing conditioner is put into sludge after centrifugal dehydration carries out cloth after mixing, into solar sandwich anhydration system, utilize the opsonic action of the puffing conditioner, in conjunction with solar sandwich drying process, framework construction, the puffing conditioner of implantation and light-catalyzed reaction are completed, to realize the lower shrinkage desiccation of the sludge in reinforcement sludge desiccation rate basis；The puffing conditioner is stirred by ammonium carbonate/ammonium hydrogen carbonate, magnesia/magnesium chloride/calcium oxide, Kelp Powder/seawood meal/blue algae powder and UEA sulphoaluminate expanders, and constituent mass ratio is 40 60%：10 20%：10 30%：5 10%, the dosage of the puffing conditioner is the 5 20% of sludge butt.Present invention utilizes the synergy that solar energy hot drying effect and puffing conditioner improve sludge, have not only constructed the basic structure of sludge drying, but also are conducive to pore-creating when follow-up sludge heat treatment and anti-shrink.
Description
Technical field
The present invention relates to a kind of solid waste treatment methods, and in particular to a kind of to be used for the low receipts of sludge under solar energy auxiliary
The desiccation dewatering of contracting, belongs to environmental technology field.
Background technology
The moisture content of general sewage plant secondary settling tank sludge is 97%~99%, and wherein Interstitial Water accounts for about 70%, and capillary water accounts for
20% or so, absorption water is about 7%, and intracellular water is about 3%.Excess sludge processing disposition before, need to by the High water cut in sludge into
Row effectively removes, and by general dehydration, such as centrifugal dehydration, plate compression, final moisture content is still in 75-85%
Between, water morphology predominantly adsorbs water and intracellular water in sludge at this time.Therefore common filter press and centrifugal dehydrator can not be right
Sludge carries out deep dehydration.The requirement of subsequent processing is cannot be satisfied, such as landfill disposal needs moisture content 60% hereinafter, for another example
Burn etc., then the moisture content of sludge needs<30%, or even to 20% hereinafter, follow-up sludge incineration, pyrolysis carbon processed could be met
Etc. heat treatment requirements.
For subsequent utilization approaches, sludge biolobic material substance will occur obviously to shrink in drying process,
General sludge is from the dewatered moisture content 80% of machinery by heat drying to 20% hereinafter, volume significantly reduces (about original
9% or so of initial body product, density also increases to 1.07g/cm from the 1.04 of beginning3), this is primarily due to reduce with moisture,
Sludge elasticity modulus becomes smaller, and the contraction caused by the evaporation of Sludge Surface moisture and its internal constraint cause final desiccation block
With unusually strong structure, it is similar to stone.The dense matter that such remaining organic matter is formed is unfavorable for subsequently pyrolysis and is made
High-grade carbon is also seriously affected in burning process and is sufficiently mixed with air, is unfavorable for its completely burned.Therefore, how in sludge
The significantly contraction of its volume is reduced in drying process, reducing the contraction of the shales biomass garbage drying process such as sludge causes to lack
Weary corresponding gas delivery holes road, becomes mud drying process problem to be solved, is also beneficial to the final place of follow-up sludge
Reason disposition.
If by the implant part substance structure skeleton in desiccation contraction process, then being aided with addition demi-inflation agent,
(as being pyrolyzed and burning) in subsequent heat treatment, encounters high temperature and be released effectively again so that shale rubbish sets up certain bone
Frame, and effectively expanded and expanded under certain hot conditions, there will be the effects conducive to subsequent heat treatment.
Invention content
It is an object of the present invention to solve in existing sludge drying method, since the fine and close desiccation that moisture loss is formed is dirty
Mud, the problem of being unfavorable for subsequent heat treatment, using the method for the additional puffing conditioning pore-creating medicament such as swelling agent, aggregate, in conjunction with too
Positive energy interlayer desiccation reaches and is conducive to improve the property after sludge drying, and the effect utilized conducive to following resource, to pole
The earth improves Social benefit and economic benefit.
The principle of the present invention is, contains a large amount of organic matter in sludge, in organic matter containing starch, lipides, protein,
Humus, cellulose and a large amount of microorganism and microorganism residuum etc.；These organic matters are hydroaropic substances, have savings and inhale
The ability of attached water, but sludge substance lacks skeleton, and in drying process, so that whole system is caved in since moisture overflows, shape
At fine and close block structure.On the one hand the present invention provides holder, simultaneously by additional a small amount of puffing conditioner for mud granule
The material of addition issues third contact of a total solar or lunar eclipse catalytic action in sun light action, certain modifying function is generated to the substance of sludge itself, separately
On the one hand the puffing conditioner of implantation is easy to decompose during heat treatment, is conducive to the pore-creating effect of sludge, is subsequent dirt
Mud resource process lays the foundation.
The present invention is achieved by the following technical solutions：
A kind of energy saving drying method of the sludge lower shrinkage based on solar energy, it is characterised in that：Dirt after centrifugal dehydration
Puffing conditioner is put into mud and carries out cloth after mixing, into solar sandwich anhydration system, utilizes the puffing conditioning
The opsonic action of agent completes framework construction, puffing conditioning and light-catalyzed reaction in conjunction with solar sandwich drying process, to real
The energy saving lower shrinkage desiccation of the existing sludge.
As a further improvement, the puffing conditioner is by ammonium carbonate/ammonium hydrogen carbonate, magnesia/magnesium chloride/oxidation
Calcium, Kelp Powder/seawood meal/blue algae powder and UEA sulphoaluminate expanders stir, and constituent mass ratio is
40-60%：10-20%：10-30%：5-10%, the dosage of the puffing conditioner are the 5-20% of sludge butt.
As a further improvement, the sludge is excess sludge or lake, river, the draining of municipal sewage plant
The higher life of the moisture content including cyanobacteria that eutrophication generates in dredging mud or lake in pipeline or pumping plant
Substance, the sludge enter the moisture content of anhydration system between 80-95%.
As a further improvement, the sludge drying is to moisture content<20%.
As a further improvement, the solar sandwich anhydration system include the photic zone being arranged in order from top to bottom,
Flexible conveyer belt, rigid conveying belt, middle water resource heat pump heating system and insulating layer, surrounding side, which is enclosed, is equipped with thermal insulation material to reduce
Heat loss, the insulating layer of the photic zone and the bottom of the thermal insulation material and top form the interlayer space of a heat preservation；Dehydration
Sludge afterwards is irradiated first on the flexible delivery band by through the euphotic sunlight, direct by solar energy
Predry chemical conversion type, deodorization, sterilization and photocatalysis denaturation are heated, is then fallen off automatically from the flexible conveyer belt by gravity
Onto rigid conveying belt, using only the air-source in the interlayer space or institute jointly using the air-source and below
It states middle water resource heat pump heating system to be heated again, further realizes desiccation.
As a further improvement, the drying method includes the following steps：
Step 1 mixes the puffing conditioner prepared with dewatered sludge, which adds
Amount is the 5-20% of dewatered sludge butt, is stirred evenly；
Sludge distributing device or high-pressure pump that step 1 obtains are delivered directly to flexible conveyer belt, entered by step 2
Solar sandwich anhydration system, mud layer thickness are maintained between 1-10cm, and sludge moves forward simultaneously with flexible conveyer belt intermittence
Desiccation is carried out, after the end for reaching flexible conveyer belt, auxiliary makes sludge Automatic-falling be conveyed to the rigidity of lower layer with mechanical scraper
Further desiccation is taken, until moisture percentage in sewage sludge<20%；
Step 3, the vapor that step 2 generates in the process turn to condensed water under euphotic condensation, by certainly
Stream or condensed water removal device enter solar sandwich anhydration system after collecting, and reduce condensed water and are imitated to the shielding of sunlight
It answers；
The sludge that step 2 obtains is sent into automatic material receiving system using cleaning shoe and is packaged, then transported outward by step 4,
Or it is carried out in situ burning and pyrolysis.
Compared with prior art, the present invention takes full advantage of solar energy hot drying effect and sludge bulking agent conditioning sludge
In synergy the basic structure of aggregate structure sludge drying can not only be utilized, but also can be with by the conditioning of puffing conditioner
Implant part vaporized components are conducive to pore-creating when follow-up sludge heat treatment and anti-shrink, dry followed by solar sandwich
Change system, is dried, and desiccation purpose is reached, to be conducive to sludge substance in follow-up carbon processed or make at the heat such as RDF
Reason feature.
Advantages of the present invention is mainly reflected in the following aspects：
1) solar energy effect is taken full advantage of, sludge etc. is uniformly dried in the air and is layered on the interlayer area of solar sandwich anhydration system
Between, the direct utilization of solar energy was not only realized, but also interlayer short space is utilized effectively to keep the temperature it simultaneously, can increased substantially dry
Change rate.
2) opsonic action of the swelling agent to sludge is taken full advantage of, can both accelerate the desiccation of sludge to be dehydrated, also by plant
Enter the components such as producible atmosphere and aggregate so that sludge forms specific structure after desiccation, reaches the effect conducive to subsequent heat treatment
Fruit.
The solar energy sludge drying system is first by adding sludge bulking agent, by itself and sludge hybrid reaction, while portion
The addition of point swelling agent is conducive to accelerate the quick-acting rates of solar energy desiccation, thus the present invention can both have been directly heated by solar energy it is dry
Change, and the functions such as sterilization, granulation can be played, while solving sludge drying, photocatalysis denaturation, sterilization and storage needs, it is real
Existing mud decrement, prepares for recycling process, has reached effective unification of environment, social and economic benefit.
Description of the drawings
The drying process schematic diagram of Fig. 1 present invention.
Specific implementation mode
The energy saving drying method of the present invention provides a kind of sludge lower shrinkage based on solar energy, the dirt after centrifugal dehydration
Puffing conditioner is put into mud and carries out cloth after mixing, into solar sandwich anhydration system, utilizes the puffing conditioning
The opsonic action of agent completes framework construction, the puffing conditioner of implantation and light-catalyzed reaction in conjunction with solar sandwich drying process,
To realize the lower shrinkage desiccation of the sludge in reinforcement sludge desiccation rate basis.
The solar sandwich anhydration system includes the photic zone, flexible conveyer belt, rigidity being arranged in order from top to bottom
(solar heat-collection plate, solar heat are handed over for conveyer belt, middle water resource heat pump heating system, insulating layer, external solar energy heat distribution system
Parallel operation) and automatic control system, surrounding side, which is enclosed, is equipped with thermal insulation material to reduce heat loss, the thermal insulation material and top
Photic zone and the bottom insulating layer formed one heat preservation interlayer space.
The photic zone is transmissive to sunlight；The flexible conveyer belt is located at the euphotic lower section and for laying
With the conveying sludge；The rigid conveying belt is located at the lower section of the flexible conveyer belt and to lay and convey the dirt
Mud；The middle water resource heat pump heating system is located at the lower section of the rigid conveying belt and connects external solar energy heat distribution system；
The insulating layer is located at the lower section of the middle water resource heat pump heating system to reduce the downward conduction of heat.
For the thickness of interlayer of the solar sandwich anhydration system between 10-30cm, the guarantors such as 8cm bilayers PC are arranged in surrounding
Warm layer material or other thermal insulation materials (such as silica wool), for reducing heat loss in interlayer.
The transparent glass such as the photic zone, preferably glass, plastic film, quartz glass or film structure, conveniently too
Sunlight enters interlayer anhydration system, and photic zone is with sludge blanket distance in 1-10cm.
The photic zone is equipped with the removal device of condensed water, by the way that either automatically or manually, not timing will be cold on glass
Solidifying vapor is pooled to vapor aqua storage tank, stops sun incident light to reduce condensed water on glass, and reduce interlayer
Interior humidity.
Sludge after centrifugal dehydration is uniformly mixed with puffing conditioner using regulating reservoir or fill process uses high pressure
Pump is mixed, and the dosage of the puffing conditioner is the 5-20% of dewatered sludge quality (butt), after mixing
Carry out cloth；For sludge thickness between 1-10cm, the angle of solar energy desiccation plate depends on dirt between 30-60 DEG C after cloth
The moisture content of mud can resist sludge sliding as final goal with the surface tension of sludge.
The sludge, be municipal sewage plant excess sludge or lake, river, drainage pipeline or pumping plant in
The shales substance such as dredged sediment, moisture content 80-95%.
The puffing conditioner is made of pore creating material, aggregate, gelling agent and UEA sulphoaluminate expanders, component
Mass ratio is 40-60%：10-20%：10-30%：5-10%, dosage are equivalent to the 5-20% amounts of dewatered sludge, fill
Divide and stirs evenly.
The pore creating material is ammonium carbonate or ammonium hydrogen carbonate, after being mixed into sludge, in solar low-temperature desiccation
It keeps stablizing in journey, and is released in gaseous form during heat treatment, to improve the fluffy of sludge bulking volume.
The aggregate is magnesia or low magnesium chloride either calcium oxide.
The gelling agent is Kelp Powder, seawood meal or blue algae powder, and moisture content is less than 5%, and granularity exists<1mm.
The cloth can carry out cloth by spiral feed system, and can also select will be aqueous using high-pressure pump
The sludge that rate reaches 85% or more is pumped directly into solar sandwich anhydration system.
The present invention is suitable for the desiccation to the shale biomass of sludge class, as municipal sludge, riverway sludge, feces of livestock and poultry and
Human excrement and urine, algae, biogas residue, Chinese medicine refine slag etc., and method includes the following steps：
Step 1 is mixed using expansion conditioner with sludge, and the dosage of the puffing conditioner is dewatered dirt
The 5-20% of shale amount, stirs evenly.
The sludge of step 1 after mixing is delivered directly to flexible delivery by step 2 with distributing device or high-pressure pump
Band, into solar sandwich anhydration system, mud layer thickness is maintained between 1-10cm, and intermittence moves forward, and enters flexibility
The conveyer belt end is assisted with mechanical scraper so that sludge Automatic-falling to lower layer's rigid conveying belt, it is heating and drying until sludge contains
Water rate<20%.
Step 3, the condensed water that step 2 is formed are entered by the condensation of glass etc., gravity flow or using wiper system
Solar sandwich anhydration system reduces its screen effect to sunlight.
Step 2 is reached the sludge of desiccation target by step 4, using cleaning shoe, is sent into automatic material receiving system, is packaged, outside
Transport or be carried out in situ the research of the drying process such as burning, pyrolysis.
Following embodiments are with the technical scheme is that premise, gives detailed embodiment and specifically operated
Journey, but protection scope of the present invention is not limited to following embodiments, for persons skilled in the art, without departing substantially from this
Any obvious change done under the premise of inventive technique scheme, belongs to the protection domain of the claims in the present invention.
Embodiment 1
Puffing conditioner is prepared using ammonium carbonate, magnesia, Kelp Powder, UEA sulphoaluminate expanders, mass ratio is
40%：20%：30%：10%, and mixed with sludge, the dosage of the puffing conditioner is the 5% of sludge butt, wherein sludge
Moisture content be 80%, be uniformly mixed, squeezed into high-pressure pump, the uniform distribution in solar sandwich anhydration system, normally too
It is dried under sunlight conditions, temperature fluctuates daytime between 38-80 DEG C in interlayer, and moisture content is reduced to 20% required time from 80%
For 2d (actual valid time is in 18h), and simple solar energy desiccation is not added with puffing conditioner, reaches identical requirement needs
3.5d (the practical irradiation time of sunlight is in 32h).Puffing conditioner is added compared with being not added with puffing conditioner, sludge density from
1.0465g/cm3Promote 1.7134g/cm3, volume-diminished, never plus expansion conditioner 6.7% is increased to 8.4%, carries
It is 25.3 times high.
Embodiment 2
Puffing conditioner, mass ratio are prepared using ammonium hydrogen carbonate, magnesium chloride, seawood meal and UEA sulphoaluminate expanders
Example is 60%：10%：25%：5%, and mixed with sludge, wherein the moisture content of sludge is 88%, which adds
Amount is the 10% of sludge butt, is uniformly mixed, after 15min, the capillary water absorbing time of sludge is increased to by the 3700s of primary sludge
4206s is squeezed into high-pressure pump, and the uniform distribution in solar sandwich anhydration system dries, interlayer under normal sunlight conditions
Interior temperature daytime is fluctuated between 38-80 DEG C, and it is that (actual valid time exists 2d that moisture content is reduced to 20% required time from 88%
For 24 hours), simple solar energy desiccation is not added with puffing conditioner, reaches identical requirement and needs 4d (the practical irradiation times of sunlight
In 36h).As a result sludge volume reduces, and never adds the 6.7% of expansion conditioner to be increased to 9.3%, improves 38.8 times.
Embodiment 3
Puffing conditioner, mass ratio are prepared using ammonium carbonate, calcium oxide, blue algae powder and UEA sulphoaluminate expanders
It is 50%：15%：27%：8%, and mixed with sludge, the dosage of the puffing conditioner is the 15% of sludge butt, wherein dirty
The moisture content of mud is 92%, is uniformly mixed, after 15min, the capillary water absorbing time of sludge is increased to by the 3700s of primary sludge
4206s is squeezed into high-pressure pump, and the uniform distribution in interlayer solar energy desiccation system dries, interlayer under normal sunlight conditions
Interior temperature daytime is fluctuated between 38-80 DEG C, and it is that (actual valid time exists 2d that moisture content is reduced to 20% required time from 92%
For 24 hours), simple solar energy desiccation is not added with puffing conditioner, reaches identical requirement and needs 4d (the practical irradiation times of sunlight
In 44h).Sludge volume reduces, and never adds the 6.7% of expansion conditioner to be increased to 9.7%, improves 44.7 times.
Embodiment 4
Puffing conditioner, ratio point are prepared using ammonium hydrogen carbonate, magnesia, Kelp Powder and UEA sulphoaluminate expanders
It Wei 60%：20%：10%：10%, and mixed with sludge, the dosage of the puffing conditioner is the 20% of sludge butt,
The moisture content of middle sludge is 95%, is uniformly mixed, and after 15min, the capillary water absorbing time of sludge is increased by the 3700s of primary sludge
It to 4206s, is squeezed into high-pressure pump, the uniform distribution in interlayer solar energy desiccation system dries under normal sunlight conditions, folder
Temperature fluctuates daytime between 38-80 DEG C in layer, and it is 3d (actual valid times that moisture content is reduced to 20% required time from 88%
In 28h), and simple solar energy desiccation is not added with puffing conditioner, reaches identical requirement and needs 4d (when the practical irradiation of sunlight
Between in 52h).Sludge volume reduces, and never adds the 6.7% of expansion conditioner to be increased to 10.2%, improves 52.2 times.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to implementations here
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (5)
1. a kind of energy saving drying method of the sludge lower shrinkage based on solar energy, it is characterised in that：Sludge after centrifugal dehydration
The middle puffing conditioner of input carries out cloth after mixing, into solar sandwich anhydration system, utilizes the puffing conditioner
Opsonic action framework construction, puffing conditioning and light-catalyzed reaction are completed, to realize in conjunction with solar sandwich drying process
The energy saving lower shrinkage desiccation of the sludge；
The puffing conditioner is by ammonium carbonate/ammonium hydrogen carbonate, magnesia/magnesium chloride/calcium oxide, Kelp Powder/seawood meal/indigo plant
Algae powder and UEA sulphoaluminate expanders stir, and constituent mass ratio is 40-60%：10-20%：10-
30%：5-10%, the dosage of the puffing conditioner are the 5-20% of sludge butt.
2. the energy saving drying method of the sludge lower shrinkage according to claim 1 based on solar energy, it is characterised in that：It is described
The sludge excess sludge that is municipal sewage plant or the dredging mud in lake, river, drainage pipeline or pumping plant, or
It is the higher biomass of the moisture content including cyanobacteria that eutrophication generates in lake, which enters containing for anhydration system
Water rate is between 80-95%.
3. the energy saving drying method of the sludge lower shrinkage according to claim 1 based on solar energy, which is characterized in that described
Sludge drying to moisture content<20%.
4. the energy saving drying method of the sludge lower shrinkage according to claim 1 based on solar energy, it is characterised in that：It is described
Solar sandwich anhydration system include the photic zone being arranged in order from top to bottom, flexible conveyer belt, rigid conveying belt, middle water source
Heat pump heating system and insulating layer, surrounding side, which is enclosed, is equipped with thermal insulation material to reduce heat loss, the thermal insulation material and top
Photic zone and the bottom insulating layer formed one heat preservation interlayer space；Dewatered sludge is first in the flexible conveyer belt
On, it is irradiated by through the euphotic sunlight, predry chemical conversion type, deodorization, sterilization and light is directly heated by solar energy
Catalyzing denaturing acts on, and is then fallen on rigid conveying belt from the flexible conveyer belt automatically by gravity, using only described
Air-source in interlayer space or the middle water resource heat pump heating system jointly using the air-source and below carry out again
Secondary heating, further realizes desiccation.
5. the energy saving drying method of the sludge lower shrinkage according to claim 4 based on solar energy, it is characterised in that：It is described
Drying method include the following steps：
Step 1, the puffing conditioner prepared is mixed with dewatered sludge, and the dosage of the puffing conditioner is
The 5-20% of dewatered sludge butt, stirs evenly；
The sludge that step 1 obtains is delivered directly to flexible conveyer belt, into the sun by step 2 with distributing device or high-pressure pump
Energy interlayer anhydration system, mud layer thickness are maintained between 1-10cm, and sludge is moved forward and carried out with flexible conveyer belt intermittence
Desiccation after the end for reaching flexible conveyer belt, assists, with mechanical scraper, making on sludge Automatic-falling to the rigid conveying belt of lower layer
Further desiccation, until moisture percentage in sewage sludge<20%；
Step 3, the vapor generated during step 2 turn to condensed water under euphotic condensation, by gravity flow or
Person's condensed water removal device enters solar sandwich anhydration system after collecting, and reduces screen effect of the condensed water to sunlight；
The sludge that step 2 obtains is sent into automatic material receiving system using cleaning shoe and is packaged, then transported outward, or just by step 4
It is burned and is pyrolyzed in ground.
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| CN107827335B (en) * | 2017-12-04 | 2020-11-27 | 中原环保郑州污泥新材料科技有限公司 | Municipal sludge harmless treatment method |
| CN111484224A (en) * | 2020-03-09 | 2020-08-04 | 杭州埃莫森环保科技有限公司 | Method and system for manufacturing anti-hardening ecological nutrient soil by using sludge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786784A (en) * | 2010-03-26 | 2010-07-28 | 甘永雄 | Solar energy and recycled water dual-heat-resource heat pump sludge drying system |
| CN102173557A (en) * | 2011-03-10 | 2011-09-07 | 北京科技大学 | Method for treating low-heating value excess sludge |
| KR20140092699A (en) * | 2013-01-16 | 2014-07-24 | 주식회사 씨엠디기술단 | Sludge solidified agent and menufacturing method of artificial soil usign the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786784A (en) * | 2010-03-26 | 2010-07-28 | 甘永雄 | Solar energy and recycled water dual-heat-resource heat pump sludge drying system |
| CN102173557A (en) * | 2011-03-10 | 2011-09-07 | 北京科技大学 | Method for treating low-heating value excess sludge |
| KR20140092699A (en) * | 2013-01-16 | 2014-07-24 | 주식회사 씨엠디기술단 | Sludge solidified agent and menufacturing method of artificial soil usign the same |
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