CN101182095A - High-effective composite filter aid for sludge dehydration and method of use thereof - Google Patents
High-effective composite filter aid for sludge dehydration and method of use thereof Download PDFInfo
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- CN101182095A CN101182095A CNA2007101507066A CN200710150706A CN101182095A CN 101182095 A CN101182095 A CN 101182095A CN A2007101507066 A CNA2007101507066 A CN A2007101507066A CN 200710150706 A CN200710150706 A CN 200710150706A CN 101182095 A CN101182095 A CN 101182095A
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- filter aid
- composite filter
- effective composite
- cao
- wilkinite
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Abstract
The invention discloses a highly efficient composite filter aid for the sludge dewatering. The component and weight percentage content are: 20-30 percent of Al2O3, 40-55 percent of SiO2, 2-8 percent of CaO, 3-13 percent of bentonite and 4-10 percent of iron powder. On the basis, 3-10 percent of Fe2O3, 0.6-2 percent of MgO, 1-2.5 percent of K2O and 0.1-0.7 percent of Na2O are added. The highly efficient composite filter aid with the quality percent of 2-6 is added in sludge after the sediment. The water content can be lowered to be 40-50 percent. No special drying equipment is required to be adopted. The invention has the advantages of high dewatering efficiency, low cost, simple process and no secondary pollution and is applied to the sludge centralized treatment of various sewage treatment plants.
Description
Technical field
The present invention relates to a kind of dewatering agent, relate in particular to a kind of high-effective composite filter aid of sludge dewatering.
Background technology
2004, national wastewater emission amount was 482.4 hundred million tons, and wherein trade effluent is 221.1 hundred million tons, 261.3 hundred million tons of town domestic sewages, and the COD quantity discharged is 1339.2 ten thousand tons in the waste water.If 65% sewage is handled with biological process, producing 2.7 tons of (dry mass) mud by ten thousand tons of waste water calculates, then the whole nation will produce 8,470,000 tons in mud (dry mass), if amount to moisture 80%, then mud is 4,233 ten thousand tons, can find out thus, mud be treated as the another difficult problem that sewage work faces.The cost that sludge treatment is disposed mainly comprises an interior transmission cost, trucking costs and landfill expense outside the venue, and the main factor that influences cost is the amount of mud, if the water ratio of mud reduces half, then 2,116 ten thousand tons in mud can be reduced in the whole nation, at least can reduce half landfill land used and trucking costs, reduce handling cost greatly, so the sludge dewatering technology has great application value.
The main component of mud is moisture (about 99%) and organism, also has a spot of nitride, phosphide, polycyclic aromatic hydrocarbons, pesticide residue, pathogenic agent and heavy metal ion etc.Common sludge treatment technique flow process such as Fig. 1.From the moiety and the treatment scheme of mud, mud decrement has two approach, and the one, reduce organic amount (digestion, burn), the 2nd, reduce the water ratio (concentrate, dehydration, drying) of mud, second kind of approach is simple than first kind of approach.
Solids in the mud mainly is made up of the electronegative colloidal solid of wetting ability, its water ratio height (being generally 96%～99%), particle is tiny and inhomogeneous, volatile solid content is high, bigger than resistance, dewatering is poor.In order to improve dewatering performance of sludge, improve the throughput of mechanical dehydration effect and mechanical dewatering equipment, can change the physico-chemical property of mud by adding flocculation agent or flocculating aids, reduce the avidity of colloidal solid and water.The purpose of sludge dewatering is further to reduce the volume of mud, facilitates follow-up processing, disposal and utilization like this.
The heat drying technology is a kind of effective sludge drying technique, but there are specific investment height (10～150,000 yuan/ton) and energy consumption height shortcomings such as (3100～3500kJ/kg water), to water ratio is that many sewage sludges of 80% carry out heat drying and handle, and dried mud per ton needs the electric energy of 2000kw.Not only energy consumption is very big during drying sludge, but also exists flue gas to handle problems, and can cause secondary pollution to environment.
Mechanical dehydration is effectively a kind of dewatering type.Mud will carry out pre-treatment usually when using mechanical dehydration, promptly by add various flocculation agents in mud, mud granule flocculation, structure are strengthened be beneficial to mechanical dehydration.At present, add flocculation agent after, generally through the water ratio of mechanical dehydration mud about 70%～80%, but to make the water ratio of mud drop to relatively difficulty of lower level.
Shen Yinghua, Wang Bin, the article of " application of organic polymer coargulator in sludge dewatering " that people such as Wang Zhizhong deliver at " polymer material science and engineering " magazine 2004.20 (9): 55-58, the kind, molecular weight, zwitterion degree, consumption, pH value of having introduced organic polymer coargulator all has a remarkably influenced to dewatering performance of sludge, and the flocculation agent cost is very high.
The most frequently used organic polymer coargulator of China is polyacrylamide (PAM) cationic flocculant at present, and its shortcoming is: (1) synthesizes cost height, complex process.(2) mud of handling with PAM is behind mechanical dehydration, and water ratio only can be reduced to about 70%.(3) but in the dehydration partial hydrolysis become poisonous monomers such as vinylformic acid and organic amine, cause producing in the water treatment procedure secondary pollution.
Summary of the invention
The objective of the invention is to overcome shortcoming and defect of the prior art, provide a kind of and can significantly improve dewatering performance of sludge, cost is low, and technology is simple, non-secondary pollution need not pass through the high-effective composite filter aid that drying process can make the lower dewatered sludge of water ratio.
The high-effective composite filter aid that is used for sludge dewatering of the present invention comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%.
Described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
High-effective composite filter aid is applied to the method that belt filter press carries out sludge dewatering: add mass percent in the steel basin before belt filter press and be 2%～6% high-effective composite filter aid, described high composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; Strainer speed is 1～3m/min, and dehydration tension force is 0.2～0.3MPa, and wash-down water pressure is 0.7～0.9MPa.
Above-mentioned high-effective composite filter aid is applied to the method that belt filter press carries out sludge dewatering, and described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O0.1%～0.7%.
High-effective composite filter aid is applied to the method that centrifuge carries out sludge dewatering: adding mass percent in the mud of post precipitation is 2%～6% efficient flocculating aids, and described high-effective composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; Centrifuge speed is 2000～3500rpm, and speed discrepancy is 12～15rpm.
Above-mentioned high-effective composite filter aid is used the method that centrifuge carries out sludge dewatering, it is characterized in that described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
High-effective composite filter aid is applied to the method that the disk continuous vacuum filter carries out sludge dewatering: add mass percent and be 2%～6% high-effective composite filter aid in the mud of post precipitation, described high-effective composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; Vacuum tightness is 0.05MPa～0.09MPa.
Above-mentioned high-effective composite filter aid is applied to the method that the disk continuous vacuum filter carries out sludge dewatering, and described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
High-effective composite filter aid is applied to the method that plate-and-frame filter press carries out sludge dewatering: add mass percent and be 2%～6% high-effective composite filter aid in the mud of post precipitation, described high-effective composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; The pressure of plate-and-frame filter press is 0.5～2.5MPa.
Above-mentioned high-effective composite filter aid is applied to the method that plate-and-frame filter press carries out sludge dewatering, it is characterized in that, described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
The invention has the beneficial effects as follows the dewatering that has improved mud, cost is low, and technology is simple, and non-secondary pollution need not can make the lower dewatered sludge of water ratio through drying process.
Description of drawings
Fig. 1: be prior art sludge treatment technique schema;
Fig. 2: be that high-effective composite filter aid of the present invention carries out the sludge treatment technique schema.
Embodiment
The effect that the present invention is used for the high-effective composite filter aid of sludge dewatering is:
This high-effective composite filter aid is joined in the mud, can play the effect of electrical neutralization and adsorption bridging, destroy the stable of mud colloidal solid, make to be gathered into macrobead between the dispersive small-particle mutually, thereby improve the dehydration property of mud.This high-effective composite filter aid is multiple particulate mechanical mixture, and voidage is generally 60%～70%, can be used as skeleton when mud is nursed one's health, make the mud flco form lasting firm structure, stop the flco collapse, reduce the compressibility of mud cake, therefore can reduce the mud resistivity.
Add high-effective composite filter aid 2%～6% (mass percent) in the mud of post precipitation, the mud after this high-effective composite filter aid conditioning is easy to dehydration and drying, and the moisture content of the cake that obtains behind press filtration or suction filtration can reduce to 40%～50%.Utilize this high-effective composite filter aid that mud is handled, not only can simplify technical process, can also reduce the dehydration energy consumption greatly.
High-effective composite filter aid of the present invention is an inorganic compositions, adopts the conventional production process preparation.Al wherein
2O
3, SiO
2, the CaO median size is 2～15 μ m, calcium oxide derives from the high-temperature calcination of lime carbonate, silicon oxide derives from quartzy mineral and forms through grinding, aluminum oxide also is to get with bauxitic clay class calcination of minerals; Wilkinite contains montmorillonite 90%; Iron powder is the chemical industry iron powder, and fineness is 200 orders.Mechanical blending is carried out with other component in wilkinite pulverizing back can make high-effective composite filter aid of the present invention.
The high-effective composite filter aid that in the mud of post precipitation, adds 2%～6% (mass percent), stir, mud is transported in the dewatering unit dewater (dehydration equipment is not had particular requirement), promptly can obtains the chunky shape dewatered sludge of water ratio 40%～50%.Thereby the present invention does not need special drying plant, greatly reduce the processing cost of mud, reduction rate is very high, take up an area of few, easy to control, safety is stable, the requirement that does not have drying process investment and working cost height (water ratio is that 80% drying sludge cost is 200～300 yuan of/ton water, and the mummification cost that adds behind the efficient flocculating aids is 40～130 yuan of/ton water), management and an operative technique is problem of higher also.
Embodiment 1
The mud that does not add high-effective composite filter aid is 77.8% with belt filter press dehydration back water ratio, and resistivity is 2.0 * 10
13M/kg.
Add 2% high-effective composite filter aid (Al in the steel basin before belt filter press
2O
330%, SiO
255%, CaO 2%, wilkinite 3%, iron powder 10%), stir, mud is taken off surely.Regulate the confession mud amount of sludge pump, strainer speed is 2m/min, and dehydration tension force is 0.3MPa.The strainer rinsing quality is very big to the dehydrating effect influence, and the selected wash-down water pressure of the present invention is 0.7MPa.After dehydration, moisture percentage in sewage sludge is 48%, and resistivity is 0.6 * 10
11M/kg.
Embodiment 2
The mud that does not add high-effective composite filter aid is 76.5% with centrifuge dehydration back water ratio, and resistivity is 1.7 * 10
13M/kg.
In mud, add 5% high-effective composite filter aid (Al
2O
320%, SiO
255%, CaO 8%, wilkinite 13%, iron powder 4%), adopt centrifuge, centrifuge speed is 2800rpm, speed discrepancy is 13rpm.After the centrifuge dehydration, water ratio is 49.5%, and resistivity is 0.71 * 10
11M/kg.
Embodiment 3
The mud that does not add high-effective composite filter aid is 79.3% with plate-and-frame filter press dehydration back water ratio, and resistivity is 2.1 * 10
13M/kg.
In thickened sludge, add 6% high-effective composite filter aid (Al
2O
330%, SiO
240%, CaO 8%, wilkinite 12%, iron powder 10%), adopt the plate-and-frame filter press dehydration, pressure adopts the PLC-tank level control system for the 1.2MPa plate-and-frame filter press, and its running status is sent μ XL (collecting and distributing control) system by last bit processing machine.Spoil disposal pond, lift pump room, concentration basin, dehydration calculator room equipment, meter status are by the manual operation of CRT (industrial control system) active station, supervision.The dehydrated sludge water ratio is 49.6%, and resistivity is 0.89 * 10
11M/kg.
Embodiment 4
The mud that does not add high-effective composite filter aid is 77.8% with belt filter press dehydration back water ratio, and resistivity is 2.0 * 10
13M/kg.
Add 5% high-effective composite filter aid (Al in the steel basin before belt filter press
2O
320%, SiO
255%, CaO 8%, wilkinite 13%, and iron powder 4% adds Fe
2O
33%, MgO 1.5%, K
2O 2.5%, Na
2O 0.1%), stir, mud is taken off surely.Regulate the confession mud amount of sludge pump, strainer speed is 2.5m/min, and dehydration tension force is 0.2MPa.The strainer rinsing quality is very big to the dehydrating effect influence, and the selected wash-down water pressure of the present invention is 0.8MPa.When dosage was 5%, moisture percentage in sewage sludge was 40%, and resistivity is 0.4 * 10
11M/kg.
Embodiment 5
The mud that does not add high-effective composite filter aid is 76.5% with centrifuge dehydration back water ratio, and resistivity is 1.7 * 10
13M/kg.
In mud, add 4% high-effective composite filter aid (Al
2O
330%, SiO
240%, CaO 8%, wilkinite 12%, and iron powder 10% adds Fe
2O
34%, MgO 2%, K
2O 1%, Na
2O 0.5%.), adopting centrifuge, centrifuge speed is 3000rpm, speed discrepancy is 14rpm.After the centrifuge dehydration, water ratio is 48.5%, and resistivity is 0.58 * 10
11M/kg.
Embodiment 6
The mud that does not add high-effective composite filter aid is 81% with disk continuous vacuum filter dehydration back water ratio, and resistivity is 2.3 * 10
13M/kg.
In thickened sludge, add 2% high-effective composite filter aid (Al
2O
326%, SiO
254%, CaO 2%, wilkinite 10%, and iron powder 8% adds Fe
2O
310%, MgO 1%, K
2O 1.5%, Na
2O 0.3%), adopt the disk continuous vacuum filter, vacuum degree control is at 0.06MPa.The dehydrated sludge water ratio is 50%, and resistivity is 0.71 * 10
11M/kg.
Embodiment 7
The mud that does not add high-effective composite filter aid is 79.3% with plate-and-frame filter press dehydration back water ratio, and resistivity is 2.1 * 10
13M/kg.
In thickened sludge, add 6% high-effective composite filter aid (Al
2O
328%, SiO
253%, CaO 7%, wilkinite 3%, and iron powder 9% adds Fe
2O
38%, MgO 0.6%, K
2O 1.1%, Na
2O 0.7%), adopt the plate-and-frame filter press dehydration, pressure adopts the PLC-tank level control system for the 1MPa plate-and-frame filter press, and its running status is sent μ XL (collecting and distributing control) system by last bit processing machine.Spoil disposal pond, lift pump room, concentration basin, dehydration calculator room equipment, meter status are by the manual operation of CRT (industrial control system) active station, supervision.The dehydrated sludge water ratio is 46.6%, and resistivity is 0.8 * 10
11M/kg.
Moisture percentage in sewage sludge adopts conventional measuring method:
Take a morsel and weigh, place the furnace pot after the oven dry, use the water-bath evaporate to dryness through the mud of mechanical dehydration.Put into 105 ℃～110 ℃ baking oven baking 2 hours then, take out and put into moisture eliminator internal cooling half hour, weigh.
The water ratio of dewatered sludge=(quality before dry back quality/drying) * 100%
The mud resistivity adopts conventional measuring method:
The method build-up of pressure that utilization vacuumizes is poor, and regulates pressure and make the whole experiment constant pressure differential, according to amount of filtrate under the level pressure suction filtration state over time, obtains mud and compares resistance.
The present invention is applicable to focusing on of large-scale wastewater treatment plant and middle or small sewage treatment mud.
The present invention is not limited to the foregoing description, and the variation of a lot of details is possible, but therefore this do not run counter to scope and spirit of the present invention.
Claims (10)
1. a high-effective composite filter aid that is used for sludge dewatering is characterized in that, comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO
2%～8%, wilkinite 3%～13%, iron powder 4%～10%.
2. according to the high-effective composite filter aid of claim 1, it is characterized in that described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds on this basis, Fe
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
3. the high-effective composite filter aid of claim 1 is applied to the method that belt filter press carries out sludge dewatering, it is characterized in that, add mass percent in the steel basin before belt filter press and be 2%～6% high-effective composite filter aid, described high-effective composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; Strainer speed is 1～3m/min, and dehydration tension force is 0.2～0.3MPa, and wash-down water pressure is 0.7～0.9MPa.
4. the high-effective composite filter aid according to claim 3 is applied to the method that belt filter press carries out sludge dewatering, it is characterized in that, described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
5. the high-effective composite filter aid of claim 1 is applied to the method that centrifuge carries out sludge dewatering, it is characterized in that, adding mass percent in the mud of post precipitation is 2%～6% efficient flocculating aids, and described high-effective composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; Centrifuge speed is 2000～3500rpm, and speed discrepancy is 12～15rpm.
6. use the method that centrifuge carries out sludge dewatering according to the high-effective composite filter aid of claim 5, it is characterized in that described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
7. the high-effective composite filter aid of claim 1 is applied to the method that the disk continuous vacuum filter carries out sludge dewatering, it is characterized in that, add mass percent and be 2%～6% high-effective composite filter aid in the mud of post precipitation, described high-effective composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; Vacuum tightness is 0.05MPa～0.09MPa.
8. the high-effective composite filter aid according to claim 7 is applied to the method that the disk continuous vacuum filter carries out sludge dewatering, it is characterized in that, described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
9. the high-effective composite filter aid of claim 1 is applied to the method that plate-and-frame filter press carries out sludge dewatering, it is characterized in that, add mass percent and be 2%～6% high-effective composite filter aid in the mud of post precipitation, described high-effective composite filter aid comprises that following feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, iron powder 4%～10%; The pressure of plate-and-frame filter press is 0.5～2.5MPa.
10. the high-effective composite filter aid according to claim 9 is applied to the method that plate-and-frame filter press carries out sludge dewatering, it is characterized in that, described feed composition and weight percent content thereof are: Al
2O
320%～30%, SiO
240%～55%, CaO 2%～8%, wilkinite 3%～13%, and iron powder 4%～10% adds Fe on this basis
2O
33%～10%, MgO 0.6%～2%, K
2O 1%～2.5%, Na
2O 0.1%～0.7%.
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|---|---|---|---|
| CNB2007101507066A CN100519452C (en) | 2007-12-04 | 2007-12-04 | High-effective composite filter aid for sludge dehydration and method of use thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101507066A CN100519452C (en) | 2007-12-04 | 2007-12-04 | High-effective composite filter aid for sludge dehydration and method of use thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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| CN100519452C CN100519452C (en) | 2009-07-29 |
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ID=39447540
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|---|---|---|---|
| CNB2007101507066A Expired - Fee Related CN100519452C (en) | 2007-12-04 | 2007-12-04 | High-effective composite filter aid for sludge dehydration and method of use thereof |
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| CN101508518B (en) * | 2009-03-24 | 2010-10-06 | 朱英 | Medicament for reducing moisture percentage in sewage sludge |
| CN102126823A (en) * | 2011-01-28 | 2011-07-20 | 湖州旺能环保科技有限公司 | Sludge dewatering process combining physical and chemical methods |
| CN102153267A (en) * | 2011-04-15 | 2011-08-17 | 复旦大学 | Method for modifying and dewatering sludge |
| CN102580680A (en) * | 2012-03-15 | 2012-07-18 | 豆远奎 | Sump oil filter aid composition |
| CN102608292A (en) * | 2012-03-09 | 2012-07-25 | 北京建筑工程学院 | Sludge specific resistance measuring apparatus |
| CN103332804A (en) * | 2013-06-05 | 2013-10-02 | 云南文山铝业有限公司 | Solid-liquid separation method for tailing pulp |
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| CN101508518B (en) * | 2009-03-24 | 2010-10-06 | 朱英 | Medicament for reducing moisture percentage in sewage sludge |
| CN102126823A (en) * | 2011-01-28 | 2011-07-20 | 湖州旺能环保科技有限公司 | Sludge dewatering process combining physical and chemical methods |
| CN102126823B (en) * | 2011-01-28 | 2012-07-18 | 湖州旺能环保科技有限公司 | Sludge dewatering process combining physical and chemical methods |
| CN102153267A (en) * | 2011-04-15 | 2011-08-17 | 复旦大学 | Method for modifying and dewatering sludge |
| CN102608292B (en) * | 2012-03-09 | 2014-07-23 | 北京建筑大学 | Sludge specific resistance measuring apparatus |
| CN102608292A (en) * | 2012-03-09 | 2012-07-25 | 北京建筑工程学院 | Sludge specific resistance measuring apparatus |
| CN102580680A (en) * | 2012-03-15 | 2012-07-18 | 豆远奎 | Sump oil filter aid composition |
| CN103332804A (en) * | 2013-06-05 | 2013-10-02 | 云南文山铝业有限公司 | Solid-liquid separation method for tailing pulp |
| CN105645730A (en) * | 2016-01-14 | 2016-06-08 | 上海交通大学 | Energy-saving quick dewatering method of argillaceous biomass refuse |
| CN105645730B (en) * | 2016-01-14 | 2018-10-19 | 上海交通大学 | A kind of the energy saving of shale biomass garbage quickly goes water method |
| CN106630542A (en) * | 2016-11-29 | 2017-05-10 | 西安理工大学 | Flocculant for treating slurry, preparation method and slurry treatment method |
| CN107459250A (en) * | 2017-09-25 | 2017-12-12 | 常州苏通海平机电科技有限公司 | A kind of preparation method of sewage dehydrating agent |
| CN108299124A (en) * | 2017-12-19 | 2018-07-20 | 苏州纳贝通环境科技有限公司 | A kind of environmental protection high effect fertilizer and preparation method thereof |
| CN115304239A (en) * | 2022-08-01 | 2022-11-08 | 华南理工大学 | Preparation method of physical conditioner for sludge dewatering and physical conditioner |
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| CN100519452C (en) | 2009-07-29 |
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