CN103342447A - Method for improving sludge dewatering performance - Google Patents
Method for improving sludge dewatering performance Download PDFInfo
- Publication number
- CN103342447A CN103342447A CN201310258975XA CN201310258975A CN103342447A CN 103342447 A CN103342447 A CN 103342447A CN 201310258975X A CN201310258975X A CN 201310258975XA CN 201310258975 A CN201310258975 A CN 201310258975A CN 103342447 A CN103342447 A CN 103342447A
- Authority
- CN
- China
- Prior art keywords
- mud
- sludge
- cpam
- magnetic field
- conditioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for improving sludge dewatering performance. According to the method disclosed by the invention, the sludge dewatering performance can be effectively improved by a common sludge conditioner cationic polyacrylamide and a novel conditioning mode matched in use with an applied magnetic field. Compared with a conventional chemical conditioning technology, the chemical conditioning medicaments added are simple in type, wide in source and small in use level, so that the sludge pre-treatment cost is greatly lowered. Meanwhile, the increment in weight of conditioned sludge is less. Compared with novel conditioning technologies such as existing microwave radiation, ultrasonic radiation or acidic treatment and surfactant addition and the like, according to the conditioning technology of the applied magnetic field, the conditioning device required is simple in structure, easy to operate and low in constructing and operating costs, and the sludge dewatering and setting performances are remarkably improved.
Description
Technical field
The present invention relates to a kind of hardening and tempering method of mud, particularly a kind of method of improving dewatering performance of sludge.
Background technology
Mud is the inevitable outcome in the city domestic sewage treating processes, and its quantity accounts for 0.3～0.5%(of the processing water yield in water ratio 97%); If sewage is carried out advanced treatment, its generation also can increase by 0.5～1.0 times.Current, about 3,000 ten thousand tons of China's mud year generation, and with annual 10～15% speed increase.How properly to dispose the mud that these quantity are huge day by day, produce every day continually, be one of sewage work's problem of having a headache most.
Moisture percentage in sewage sludge height, dehydration difficulty are the key obstacles that the restriction sludge treatment is disposed.At present, domestic most of sewage work mainly adopts machinery to dewater, its ultimate principle is that pressure difference with the filtration medium both sides is as impellent, make the moisture in the mud be forced through filtration medium, form filtrate discharge, and solid particulate is trapped within the filter cake that becomes on the filtration medium after the dehydration, thereby realizes the purpose of sludge dewatering.Mechanical sludge dewatering equipment also has a spot of traditional plate-and-frame filter press based on belt filter press, centrifuge, generally can only the sludge dewatering to 80% with water ratio 97～99% about, can't satisfy most of sludge disposal technology to the requirement of moisture percentage in sewage sludge.Therefore, the dewatering of selecting suitable pretreatment process to improve mud before sludge dewatering treatment is normally studied the focus of concern.
For the mud pre-treatment, the most common is the chemical conditioning method that adds chemical agent.The chemical reaction that this method utilizes medicament to be risen at mud colloid microparticle surfaces, in and mud colloid particulate with electric charge, impel the mud particle coagulation to become big particle flco, water is separated from mud granule, thereby is improved the dewatering of mud.The common chemical amendment is generally based on molysite, calcium salt, the flocculation agent that is aided with a spot of other kinds again, total amendment addition often accounts for 20～30% of dewatered sludge dry weight, therefore, adopt chemical conditioning method that mud is carried out pre-treatment and have shortcomings such as reagent consumption height, mud weightening finish be obvious.Cationic-type polyacrylamide (CPAM) is one of at present the most frequently used chemical floc, mainly plays absorption charge neutrality, adsorption bridging and volume and sweep cohesion in the Sludge Chemical Conditioning process, and the improvement of dewatering performance of sludge is had effect comparatively significantly.
, also have the conditioning mode of some novelties in addition, as utilize microwave radiation, ultrasonic radiation, flocculation agent etc., or utilize acid treatment and tensio-active agent to wait to improve the dewatering of mud except adding the chemical conditioning technology of medicament for the mud pre-treatment.External existing the utilize dewatering of magnetic field opsonic activity mud and the report of settling property, find that magnetic field truly has the improvement effect to the dewatering of mud, its principle is mainly utilized the biological effect of magnetic, change the surface properties of mud granule, the motion of accelerometer surface charge, make disrupted cell discharge a large amount of interstitial waters, thereby improve dewatering performance of sludge.
Summary of the invention
The objective of the invention is to utilize externally-applied magnetic field and CPAM combined action, in the modified process of mud, improve dewatering performance of sludge, reduce the consumption of medicament simultaneously.
The technical solution used in the present invention is:
A kind of method of improving dewatering performance of sludge comprises the steps:
1) cationic-type polyacrylamide is dissolved in the water, obtains CPAM solution;
2) CPAM solution is added in the mud to mixing;
3) mud is placed the stationary magnetic field, continue to mix, obtain modified mud.
As a further improvement on the present invention, the intensity in magnetic field is 10～50 mT, and preferred, the churning time in the stationary magnetic field is 30～60 min, and special stir speed (S.S.) in the stationary magnetic field is 30 rpm.
As a further improvement on the present invention, the final concentration of CPAM in mud is 20～100 mg/L, is preferably 40～80 mg/L.
As a further improvement on the present invention, 200 rpm stir 1 min and make CPAM solution and mud mixing.
The invention has the beneficial effects as follows:
The inventive method utilizes common sludge conditioner cationic-type polyacrylamide and novel conditioning mode externally-applied magnetic field to be used, and can effectively improve the dewatering of mud.Compare with traditional chemical conditioning technology, the chemical conditioning medicament kind of interpolation is simple, wide material sources, consumption are few, has greatly reduced mud pre-treatment cost, makes the mud gain in weight after the conditioning little simultaneously; Compare with novel conditioning technology such as existing microwave radiation, ultrasonic radiation or acid treatment and tensio-active agent interpolations, the required conditioning system simple structure of the conditioning technology of externally-applied magnetic field, operation easily, construction and running cost are low, and sludge dewatering and settling property are improved significantly.Generally, the inventive method combines the advantage of chemical conditioning and magnetic field conditioning technology, make the mud granule in the mud assemble sedimentation by the biological effect in electrical neutralizing effect, adsorption effect, bridge linking effect and magnetic field, effectively reduce mud resistivity and capillary water absorption time, improved the dewatering of mud.Sludge dewatering pressure after the conditioning is little, and moisture percentage in sewage sludge is reduced greatly, has made things convenient for the subsequent disposal of mud, has good application prospects.
Embodiment
Below in conjunction with embodiment, further specify the present invention.
The modified reaction unit of employed mud is in following examples: the degree of depth 15 cm, internal diameter 5 cm, volume 300 ml also are furnished with the right cylinder reaction unit of agitator, external application 1200 circle diameters are that the copper conductor of 1.5 mm twines, copper conductor links to each other with D.C. regulated power supply, is used for providing the stationary magnetic field of certain intensity.
For the purpose of convenient, earlier with cationic-type polyacrylamide (CPAM) powder dissolution in water, making concentration is the CPAM storing solution of 1.0 g/l, places behind 24 h stand-by.
The dewatering of mud means the complexity of sludge dewatering, uses mud resistivity (SRF) and capillary water absorption time (CST) two parameters to estimate usually.Sludge dewatering the most frequently used method at present is to filter, and SRF is on the unit filtration area, and the resistance that the dried solid masses of filter cake unit is suffered is for the index of weighing sludge filtration dehydration complexity.The ratio resistance of mud is more big, more sad filter, and its dewatering is also just more poor.CST means that the water in the mud permeates the needed time of certain distance at absorbent filter, is applicable to all sludge dewatering processes, is actual motion control dewatering index the most commonly used.The CST value is more big, and dewatering is more poor.
In following examples, after sludge conditioning is good, mud mixture 100 ml that get after the conditioning evenly pour in the B that diameter is 9 cm, carry out vacuum filtration dehydration (suction filtration pressure is 0.03 MPa) with vacuum pump, measure SRF, CST and filter cake moisture content.
Embodiment 1
Be that 99.1% residual active sludge is object with water ratio, add the CPAM storing solution, stir 1 min with 200 rpm CPAM is evenly mixed with mud, the final concentration of CPAM is 40 mg/l;
In reaction unit, apply the stationary magnetic field that intensity is 20 mT, and stir mud with the speed of 30 rpm, continue namely to obtain modified good mud behind 30 min.
After measured, the SRF of above-mentioned modified mud is 1.54 * 10
12M/kg, CST are 44.1 s, and filter cake moisture content is 79.0%.
Embodiment 2
Be that 98.5% residual active sludge is object with water ratio, add the CPAM storing solution, stir 1 min with 200 rpm CPAM is evenly mixed with mud, the final concentration of CPAM is 40 mg/l;
In reaction unit, apply the stationary magnetic field that intensity is 40 mT, and stir mud with the speed of 30 rpm, continue namely to obtain modified good mud behind 30 min.
After measured, the SRF of above-mentioned modified mud is 7.26 * 10
11M/kg, CST are 36.5 s, and filter cake moisture content is 76.4%.
Embodiment 3
Be that 98.0% residual active sludge is object with water ratio, add the CPAM storing solution, stir 1 min with 200 rpm CPAM is evenly mixed with mud, the final concentration of CPAM is 60 mg/l;
In reaction unit, apply the stationary magnetic field that intensity is 40 mT, and stir mud with the speed of 30 rpm, continue namely to obtain modified good mud behind 30 min.
After measured, the SRF of above-mentioned modified mud is 9.55 * 10
11M/kg, CST are 39.5 s, and filter cake moisture content is 77.1 %.
Embodiment 4
Be that 99.0% residual active sludge is object with water ratio, add the CPAM storing solution, stir 1 min with 200 rpm CPAM is evenly mixed with mud, the final concentration of CPAM is 80 mg/l;
In reaction unit, apply the stationary magnetic field that intensity is 40 mT, and stir mud with the speed of 30 rmp, continue namely to obtain modified good mud behind 30 min.
After measured, the SRF of above-mentioned modified mud is 3.06 * 10
12M/kg, CST are 49.1 s, and filter cake moisture content is 81.5 %.
Embodiment 5
Be that 97.4% residual active sludge is object with water ratio, add the CPAM storing solution, stir 1 min with 200 rpm CPAM is evenly mixed with mud, the final concentration of CPAM is 40 mg/l;
In reaction unit, apply the stationary magnetic field that intensity is 40 mT, and stir mud with the speed of 30 rpm, continue namely to obtain modified good mud behind 40 min.
After measured, the SRF of above-mentioned modified mud is 3.26 * 10
11M/kg, CST are 30.5 s, and filter cake moisture content is 72.2 %.
Embodiment 6
Be that 99.2% residual active sludge is object with water ratio, add the CPAM storing solution, stir 1 min with 200 rpm CPAM is evenly mixed with mud, the final concentration of CPAM is 40 mg/l;
In reaction unit, apply the stationary magnetic field that intensity is 40 mT, and stir mud with the speed of 30 rmp, continue namely to obtain modified good mud behind 60 min.
After measured, the SRF of above-mentioned modified mud is 7.55 * 10
11M/kg, CST are 37.8 s, and filter cake moisture content is 78.4 %.
Simultaneous test
Dewatering performance of sludge evaluation when only adding CPAM:
Be that 99.1% residual active sludge is object with water ratio, add the CPAM storing solution, stir 1 min with 200 rpm CPAM is evenly mixed with mud, the speed with 30 rpm stirs afterwards, obtains modified good mud behind lasting 30 min; When the final concentration of CPAM is 20,40,60,80 and during 100mg/l, after measured, the SRF of above-mentioned modified mud is respectively 6.56 * 10
12, 3.64 * 10
12, 2.87 * 10
12, 4.51 * 10
12With 5.34 * 10
12M/kg; CST is respectively 62.8,50.7,48.2,54.3 and 58.9 s; Filter cake moisture content is 85.8,83.3,82.5,83.6 and 85.0 %.
Only dewatering performance of sludge is estimated during externally-applied magnetic field:
Be that 99.1% residual active sludge is object with water ratio, in reaction unit, apply the stationary magnetic field that intensity is 10,20,30,40 and 50 mT respectively, and stir with the speed of 30 rpm, continue to obtain modified good mud behind 30 min; After measured, the SRF of above-mentioned modified mud is respectively 1.36 * 10
13, 9.66 * 10
12, 8.54 * 10
12, 5.12 * 10
12With 5.65 * 10
12M/kg; CST is 79.8,73.4,68.5,58.3 and 59.2 s; Filter cake moisture content is 89.4,87.6,87.3,87.1 and 88.0%.
From above embodiment and simultaneous test data as can be known, CPAM and magnetic field have good synergy, can well improve the dewatering of mud.Particularly exist, the intensity in magnetic field is 10～50 mT, and the churning time in the stationary magnetic field is 30～60 min, the final concentration of CPAM in mud is 40～80 mg/L, can realize realizing fast the conditioning of mud, the CPAM consumption also significantly reduces simultaneously, has best comprehensive cost.
The inventive method can reduce the dosage of chemical conditioning medicament CPAM in the modified process of mud, easy to operate simple, running cost is low, can significantly reduce SRF, CST and the moisture percentage in sewage sludge of mud, improves dewatering performance of sludge, have a good application prospect.
Claims (7)
1. a method of improving dewatering performance of sludge comprises the steps:
1) cationic-type polyacrylamide is dissolved in the water, obtains CPAM solution;
2) CPAM solution is added in the mud to mixing;
3) mud is placed the stationary magnetic field, continue to mix, obtain modified mud.
2. method according to claim 1, it is characterized in that: the intensity in magnetic field is 10～50 mT.
3. method according to claim 1 and 2, it is characterized in that: the churning time in the stationary magnetic field is 30～60 min.
4. method according to claim 1 and 2, it is characterized in that: the stir speed (S.S.) in the stationary magnetic field is 30 rpm.
5. method according to claim 1 and 2, it is characterized in that: the final concentration of CPAM in mud is 20～100 mg/L.
6. method according to claim 5 is characterized in that: 40～80 mg/L that the final concentration of CPAM in mud is.
7. method according to claim 1 and 2, it is characterized in that: 200rpm stirs 1 min and makes CPAM solution and mud mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310258975XA CN103342447A (en) | 2013-06-26 | 2013-06-26 | Method for improving sludge dewatering performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310258975XA CN103342447A (en) | 2013-06-26 | 2013-06-26 | Method for improving sludge dewatering performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103342447A true CN103342447A (en) | 2013-10-09 |
Family
ID=49277289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310258975XA Pending CN103342447A (en) | 2013-06-26 | 2013-06-26 | Method for improving sludge dewatering performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103342447A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105399302A (en) * | 2015-12-21 | 2016-03-16 | 广东金颢轩环境工程设备科技有限公司 | Deep sludge magnetization dehydration treatment method |
| CN106045265A (en) * | 2016-07-12 | 2016-10-26 | 河南永泽环境科技有限公司 | Sludge dewatering method combining chitosan and magnetic field |
| CN109467303A (en) * | 2017-09-08 | 2019-03-15 | 湖南大学 | A kind of processing method of quick raising sludge settling and dewatering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5846435A (en) * | 1996-09-26 | 1998-12-08 | Haase; Richard Alan | Method for dewatering of sludge |
| JP2003175400A (en) * | 2001-12-13 | 2003-06-24 | Ishigaki Co Ltd | Method for treatment of sewage sludge |
| CN101328002A (en) * | 2007-06-20 | 2008-12-24 | 上海滨浦水处理设备有限公司 | Method and apparatus for improving sludge dehydration |
| CN101618936A (en) * | 2009-07-24 | 2010-01-06 | 江苏工业学院 | Method for improving dewatering performance of sludge |
-
2013
- 2013-06-26 CN CN201310258975XA patent/CN103342447A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5846435A (en) * | 1996-09-26 | 1998-12-08 | Haase; Richard Alan | Method for dewatering of sludge |
| JP2003175400A (en) * | 2001-12-13 | 2003-06-24 | Ishigaki Co Ltd | Method for treatment of sewage sludge |
| CN101328002A (en) * | 2007-06-20 | 2008-12-24 | 上海滨浦水处理设备有限公司 | Method and apparatus for improving sludge dehydration |
| CN101618936A (en) * | 2009-07-24 | 2010-01-06 | 江苏工业学院 | Method for improving dewatering performance of sludge |
Non-Patent Citations (1)
| Title |
|---|
| 李帅: "磁化处理对城市污泥脱水性能影响研究", 《中国优秀硕士学位论文全文数据库工程科技I辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105399302A (en) * | 2015-12-21 | 2016-03-16 | 广东金颢轩环境工程设备科技有限公司 | Deep sludge magnetization dehydration treatment method |
| CN106045265A (en) * | 2016-07-12 | 2016-10-26 | 河南永泽环境科技有限公司 | Sludge dewatering method combining chitosan and magnetic field |
| CN109467303A (en) * | 2017-09-08 | 2019-03-15 | 湖南大学 | A kind of processing method of quick raising sludge settling and dewatering |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104098250B (en) | A kind of municipal sludge chemical conditioning strengthening preliminary mechanical dehydration associating electro-osmosis two-stage deep dehydration method | |
| Yang et al. | Flocculation-dewatering behavior of waste activated sludge particles under chemical conditioning with inorganic polymer flocculant: Effects of typical sludge properties | |
| CN106698888B (en) | A kind of chemical amendment dosage optimization method for deeply dehydrating sludge | |
| CN102603152A (en) | Sludge deep dehydration conditioning agent and application thereof | |
| CN105984929B (en) | A kind of aluminium silicate polymer zinc composite flocculation agent and its application | |
| CN102452781B (en) | Based on the carbon back mud combined cooker dewatering agent of sludge incineration | |
| CN101691272A (en) | Sludge dewatering method | |
| CN103030258A (en) | Deep dehydration device and dehydration method for sludge | |
| CN108083609A (en) | A kind of method that municipal sludge is nursed one's health by composite reagent | |
| CN104973750A (en) | Combined conditioning method for sludge high-efficient dehydration | |
| CN110395878A (en) | A kind of municipal sludge deep dewatering, solidifying method | |
| Zhang et al. | The study of Na2SiO3 as conditioner used to deep dewater the urban sewage dewatered sludge by filter press | |
| CN102553533A (en) | Method for preparing composite dephosphorus adsorbent by virtue of activated carbon fiber loaded with metal | |
| CN104016454B (en) | A kind of preparation method of the flocculating settling agent for secondary lead wastewater treatment | |
| CN103193374A (en) | Sludge dewatering tempering agent and method for sludge dewatering by utilizing same | |
| CN103113013A (en) | Compound type sludge dewatering conditioner and application method thereof | |
| CN104003604A (en) | Sludge treatment additive and use method of sludge treatment additive | |
| CN103342447A (en) | Method for improving sludge dewatering performance | |
| CN111233304A (en) | Wall breaking agent for sludge, hydrophobic skeleton, preparation method and sludge reduction method | |
| Yang et al. | Explore the closed-loop disposal route of surplus sludge: Sludge self-circulation preparation of sludge-based biochar (SBB) to enhance sludge dewaterability | |
| CN102167431B (en) | Method for preparing cation type composite flocculant for treating waste drilling fluid | |
| CN104150741A (en) | Sludge chemical conditioning method and conditioner | |
| CN108164124A (en) | A kind of deep dehydration conditioner and its application suitable for advanced anaerobically digested sludge | |
| CN106242241B (en) | A kind of ecology Dredged bed mud dehydration phosphor-curing agent | |
| CN101734839B (en) | Compound flocculant treating process for sludge dewatering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131009 |