CN102923928A - Method for improving dehydration performance of sludge by adding tannery sludge incineration bottom ash - Google Patents
Method for improving dehydration performance of sludge by adding tannery sludge incineration bottom ash Download PDFInfo
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- CN102923928A CN102923928A CN2012104093148A CN201210409314A CN102923928A CN 102923928 A CN102923928 A CN 102923928A CN 2012104093148 A CN2012104093148 A CN 2012104093148A CN 201210409314 A CN201210409314 A CN 201210409314A CN 102923928 A CN102923928 A CN 102923928A
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Abstract
The invention relates to a method for improving dehydration performance of sludge by adding tannery sludge incineration bottom ash. The method comprises the following steps of: adding the tannery sludge incineration bottom ash in proportion into tannery sludge at normal temperature and normal pressure, fully stirring the mixture till complete mixing; and adding a cationic polyacrylamide flocculant, stirring and fully blending the mixture with a coagulation agitator. Positive charge of soluble positive valence metal ion on the surface of the tannery sludge incineration bottom ash can neutralize negative charge of the sludge, and gaps are formed in the filtering process because sludge particles are hard and have irregular surfaces; the method is easy to operate; treated tannery sludge is analyzed, the output of net sludge of a sludge sample is increased from 1.15kg/m<2>h to 10.30kg/m<2>h, and the filtration time is reduced from 132s to 7s; and the output and the dehydration performance of the sludge are remarkably improved.
Description
Technical field
The present invention relates to a kind of method that the leather-making mud bottom ash improves dewatering performance of sludge that adds, belong to field of environment engineering.
Background technology
Leather-making mud is mainly derived from that the immersion stage produces contains bacterium organic sludge, sulfur-bearing mud that the depilation stage produces, chromium-bearing sludge that tanning process produces and with the biochemical sludge that produces behind physics, chemistry, the biological method processing leather-making waste water.Usually, the water ratio of leather-making mud is 98%, and organism in the mud, mainly is thalline and extracellular polymeric, and the existence of a large amount of colloidal solids and cause mud to be difficult to dehydration.Add dewatering that chemical amendment improves mud and be at present the most frequently used method, by build bridge and the effect of charge neutralization so that the dewatering of mud obviously improve.Yet because flocculation mud has very high compressibility, the flocculation mud granule is easy to deform in the mechanical dehydration process, stops up filtration channel, thereby forms the very poor mud cake of filterableness, cause moisture be difficult to by.Therefore, add separately chemical amendment and can not obtain desirable dehydrating effect.How effectively to improve the dewatering of mud, day by day receive people's concern.
Sludge incineration is processed has minimizing, stabilization and innoxious characteristics.Slag is mainly used in the aspects such as the backing plate of soil utilization, cement producting material, Road construction or asphalt at the bottom of the sludge incineration of its generation.But, because it contains a large amount of inorganic salt and heavy metal, has restricted it and used, so landfill method is still the main path of present disposing sludge bottom ash.
Studies show that, by adding the obviously compressibility of reduce mud of flocculating aids, improve the porosity of mud.Leather-making mud bottom ash particle has characteristics hard, surface imperfection, simultaneously, the silicon that it is surperficial and aluminium salt such as pure aluminium silicate, ferric metasilicate, Calucium Silicate powder etc. are soluble in water, make to contain a large amount of positively charged metal ions in the aqueous solution.When the leather-making mud bottom ash joined in the mud, the negative charge in the mud and positive charge metal ion soluble in water neutralization were taken off surely mud granule, and colloidal solid flocculates mutually.Mud through conditioning adds cationic polyacrylamide flocculant agent again, more is conducive to the flocculation of particle, further improves sedimentation and the dewatering of mud.The present invention utilizes the leather-making mud bottom ash that mud is carried out preconditioned, improves the dewatering of mud by the synergy of leather-making mud bottom ash and cationic polyacrylamide, realizes simultaneously the recycling of leather-making mud bottom ash.
Summary of the invention
The present invention is directed to flocculation mud owing to its high compressibility causes the difficult problem of dewatering, a kind of method that the leather-making mud bottom ash improves dewatering performance of sludge that adds is provided.Add the leather-making mud bottom ash at leather-making mud in proportion at normal temperatures and pressures, be stirred well to fully and mix, then add cationic polyacrylamide flocculant agent, stir at the coagulation stirrer, allow its abundant mixing.The present invention utilize the positive valence metal ion of leather-making mud bottom ash soluble surface positively charged in and the mud negative charge, simultaneously in filtration because the hard and interstitial characteristics of surface imperfection of particle itself.Process by leather-making mud bottom ash and cationic polyacrylamide flocculant agent, can realize the high-efficiency dehydration of mud, provide new outlet for leather-making mud bottom ash resource utilization simultaneously.
To achieve these goals, the present invention adopts following technical scheme:
A kind of method that the leather-making mud bottom ash improves dewatering performance of sludge that adds provided by the invention may further comprise the steps:
(1) preparation of leather-making mud bottom ash: the leather-making mud (leather-making mud is the mixing sludge of chemical coagulation mud and biochemical sludge) of the belt of learning from else's experience filter press technique dehydration, natural airing to water ratio is 50%, grinds; The powdery leather-making mud being put into coal-powder boiler burn, is to burn 1 hour under 900 ℃ of conditions in temperature, burns residual slag and is the leather-making mud bottom ash;
(2) getting the leather-making mud bottom ash is that 98% leather-making mud carries out preconditioned to water ratio, and the leather-making mud bottom ash that adds and the dewatered sludge mass ratio of leather-making mud are 0.5～2.5:1;
(3) after abundant the mixing, add cationic polyacrylamide flocculant agent, the dosage scope of cationic polyacrylamide flocculant agent is 5～20 kg/t; Being positioned in the stirrer, is to stir 20 seconds under the 300rmp at rotating speed, is to stir 40 seconds under the 60rmp at rotating speed then, makes its abundant mixing;
(4) method that adopts vacuum filtration to dewater is measured respectively the dehydration indexes under the above-mentioned different condition after the suction filtration dehydration.
The preferred mass ratio of dewatered sludge of the leather-making mud bottom ash above-mentioned steps 2) and leather-making mud is 1.5:1.
Above-mentioned steps 3) the preferred dosage of cationic polyacrylamide flocculant agent is 10 kg/t in.
Behind leather-making mud bottom ash and cationic polyacrylamide flocculant agent lignin-sludge, the clean sludge creation amount of mud sample is by 1.15 kg/m
2H is increased to 10.30 kg/m
2H, filtration time is down to 7s by 132s.
Compare with independent use cationic polyacrylamide flocculant agent, the beneficial effect of patent of the present invention is as follows:
1, the neutralization of the colloid negative charge in the positive valence metal ion of the solubility on leather-making mud bottom ash surface and the sludge system destroys the mud double electrical layers, makes mutually flocculation between the mud granule.Thereby under the same dose cationic polyacrylamide flocculant agent, its dewatering is improved significantly.
2, the hard and surface imperfection of leather-making mud bottom ash particle itself is not yielding in the mud compression process, forms hole, reduces simultaneously the compressibility of sludge cake, thereby improves significantly the dewatering of mud.
3, be the recycling of leather-making mud bottom ash, the treatment of wastes with processes of wastes against one another provides new method.
Description of drawings
Accompanying drawing 1 is technological process synoptic diagram of the present invention.
Embodiment
Embodiment 1
Get five 100ml water ratio and be 98% leather-making mud sample in the 500ml beaker, the quality of its dewatered sludge is 2g, adding and dewatered sludge mass ratio are 0,50%, 100%, 150%, 200%, 250% leather-making mud bottom ashs respectively, measure its dewatering after fully stirring, comprise clean sludge creation amount (total solids that per area per time produces) and filtration time (filtrate volume reaches the needed time of sample Total Water one half), the result is as shown in table 1.
In addition, get five 100ml water ratio and be 98% leather-making mud sample in the 500ml beaker, the quality of its dewatered sludge is 2g, respectively according to 0,5,10,15, the ratio of 20kg/t adds cationic polyacrylamide flocculant agent and carries out flocculation dewatering, measure its dewatering, comprise clean sludge creation amount and filtration time, the result is as shown in table 2.
Table 1 leather-making mud bottom ash is on the impact of dewatering performance of sludge
| Leather-making mud bottom ash dosage (%) | Clean sludge creation amount (kg/m 2h) | Filtration time (s) |
| 0 | 1.15 | 132 |
| 50 | 1.53 | 90 |
| 100 | 1.95 | 65 |
| 150 | 2.23 | 50 |
| 200 | 2.33 | 42 |
| 250 | 2.20 | 46 |
Table 2 cationic polyacrylamide flocculant agent is on the impact of dewatering performance of sludge
| Cationic polyacrylamide flocculant agent dosage (kg/t) | Clean sludge creation amount (kg/m 2h) | Filtration time (s) |
| 0 | 1.15 | 132 |
| 5 | 1.77 | 85 |
| 10 | 4.06 | 32 |
| 15 | 6.40 | 14 |
| 20 | 7.49 | 12 |
Embodiment 2
Get five 100ml water ratio and be 98% leather-making mud sample in the 500ml beaker, the quality of its dewatered sludge is 2g, adding and dewatered sludge mass ratio are 0,50%, 100%, 150%, 200%, 250% leather-making mud bottom ashs respectively, after fully stirring, again respectively according to 0,5,10,15, the ratio of 20kg/t adds cationic polyacrylamide flocculant agent and carries out flocculation dewatering, measure at last its dewatering, comprise clean sludge creation amount and filtration time, the result is as shown in table 3.
The dehydrating effect of mud contrast under the table 3 different treatment condition
| Leather-making mud bottom ash dosage (%) | Cationic polyacrylamide flocculant agent dosage (kg/t) | Clean sludge creation amount (kg/m 2h) | Filtration time (s) |
| 0 | 0 | 1.15 | 132 |
| 150 | 10 | 10.30 | 7 |
| 0 | 10 | 4.06 | 32 |
| 0 | 20 | 7.49 | 12 |
Embodiment 3
Get the 1L leather-making mud in beaker, measure under the different condition impact on sludge filtration speed.Choose respectively: water ratio is 98% leather-making mud, flocculation mud (10kg/t), the flocculation mud (10kg/t+150%) of leather-making mud bottom ash conditioning mud (150%) and the conditioning of leather-making mud bottom ash.Suction filtration under the Vacuum Pressure of 0.6MPa until filtrate volume does not change substantially, namely reaches equilibrium state, the record filtering required time.The result is as shown in table 4.
The sludge filtration time under table 4 different condition
Claims (3)
1. one kind adds the method that the leather-making mud bottom ash improves dewatering performance of sludge, it is characterized in that the method may further comprise the steps:
(1) preparation of leather-making mud bottom ash: the leather-making mud of the belt of learning from else's experience filter press technique dehydration, natural airing to water ratio is 50%, grinds; The powdery leather-making mud being put into coal-powder boiler burn, is to burn 1 hour under 900 ℃ of conditions in temperature, burns residual slag and is the leather-making mud bottom ash;
(2) getting the leather-making mud bottom ash is that 98% leather-making mud carries out preconditioned to water ratio, and the leather-making mud bottom ash that adds and the dewatered sludge mass ratio of leather-making mud are 0.5～2.5:1;
(3) after abundant the mixing, add cationic polyacrylamide flocculant agent, the dosage of cationic polyacrylamide flocculant agent is 5～20 kg/t; Being positioned in the stirrer, is to stir 20 seconds under the 300rmp at rotating speed, is to stir 40 seconds under the 60rmp at rotating speed then, makes its abundant mixing;
(4) method that adopts vacuum filtration to dewater is measured respectively the dehydration indexes under the above-mentioned different condition after the suction filtration dehydration.
2. method according to claim 1, it is characterized in that: the leather-making mud bottom ash above-mentioned steps 2) and the dewatered sludge mass ratio of leather-making mud are 1.5:1.
3. method according to claim 1 is characterized in that: the dosage of cationic polyacrylamide flocculant agent is 10 kg/t above-mentioned steps 3).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107628742A (en) * | 2017-11-01 | 2018-01-26 | 葛洲坝中固科技股份有限公司 | A kind of method of Chemical Pretreatment solidification and stabilization press filtration processing leather-making mud |
| CN110540354A (en) * | 2019-08-20 | 2019-12-06 | 中国皮革制鞋研究院有限公司 | Resource recycling process for materialized sludge in leather making industry |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1965734A1 (en) * | 1969-12-31 | 1971-07-08 | Degussa | Peat as filtering aid in clearing sludge - dehydration |
| JP2001062500A (en) * | 1999-08-31 | 2001-03-13 | Makoto Terunuma | Dehydrating method using carbonate sludge |
| JP2001062499A (en) * | 1999-08-31 | 2001-03-13 | Makoto Terunuma | Pressure dehydrating method using carbonated sludge |
| JP2003154400A (en) * | 2001-11-22 | 2003-05-27 | Ishigaki Co Ltd | Dehydration method utilizing carbonized sludge and dehydrator therefor |
| CN101717240A (en) * | 2009-11-26 | 2010-06-02 | 山东轻工业学院 | Method for preparing porcelain granules from tannery sludge |
-
2012
- 2012-10-24 CN CN2012104093148A patent/CN102923928A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1965734A1 (en) * | 1969-12-31 | 1971-07-08 | Degussa | Peat as filtering aid in clearing sludge - dehydration |
| JP2001062500A (en) * | 1999-08-31 | 2001-03-13 | Makoto Terunuma | Dehydrating method using carbonate sludge |
| JP2001062499A (en) * | 1999-08-31 | 2001-03-13 | Makoto Terunuma | Pressure dehydrating method using carbonated sludge |
| JP2003154400A (en) * | 2001-11-22 | 2003-05-27 | Ishigaki Co Ltd | Dehydration method utilizing carbonized sludge and dehydrator therefor |
| CN101717240A (en) * | 2009-11-26 | 2010-06-02 | 山东轻工业学院 | Method for preparing porcelain granules from tannery sludge |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107628742A (en) * | 2017-11-01 | 2018-01-26 | 葛洲坝中固科技股份有限公司 | A kind of method of Chemical Pretreatment solidification and stabilization press filtration processing leather-making mud |
| CN110540354A (en) * | 2019-08-20 | 2019-12-06 | 中国皮革制鞋研究院有限公司 | Resource recycling process for materialized sludge in leather making industry |
| CN110540354B (en) * | 2019-08-20 | 2022-04-05 | 中国皮革制鞋研究院有限公司 | Resource recycling process for materialized sludge in leather making industry |
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Application publication date: 20130213 |