CN104478180A - Method for improving mobility of dewatered sludge with low moisture content in supercritical treatment - Google Patents
Method for improving mobility of dewatered sludge with low moisture content in supercritical treatment Download PDFInfo
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- CN104478180A CN104478180A CN201410779966.XA CN201410779966A CN104478180A CN 104478180 A CN104478180 A CN 104478180A CN 201410779966 A CN201410779966 A CN 201410779966A CN 104478180 A CN104478180 A CN 104478180A
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- dewatered sludge
- mobility
- bubble
- water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
Abstract
The invention relates to a method for improving the mobility of dewatered sludge with low moisture content in supercritical treatment, belonging to the field of sewage treatment. The method comprises the following steps: before conveying the dewatered sludge, proportionally mixing bubbles with the dewatered sludge and stirring uniformly to obtain bubble-mixed dewatered sludge, wherein 95-98% of dewatered sludge by weight and 2-5% of bubbles by weight are uniformly mixed, and the time for obtaining 50% antifoaming rate of the bubbles is longer than 30 minutes. The method is safe and reliable and simple and easy to implement, the mobility of the dewatered sludge can be remarkably improved by 15-30%, and the flow resistance when the dewatered sludge is conveyed through a pipeline is reduced; and the effect of improving the mobility of dewatered sludge by the method can last longer than 30 minutes, and over 95% of mobility is kept to meet the actual conveying needs.
Description
Technical field
The invention belongs to sewage treatment area, be specifically related to a kind of method improving low-water-content dewatered sludge mobility in first supercritical processing.
Background technology
Dewatered sludge, as the final product of municipal sewage treatment, containing large amount of organic, heavy metal and hazardous contaminant etc., need carry out rationally effectively processing disposal to it.The problem of dewatered sludge conveying will inevitably be run in supercritical water gasification process.The general water ratio of China's dewatered sludge is about 80%, presents g., jelly-like, poor fluidity, Cemented filling difficulty, and general by car fortune or spiral pump transport, its transport efficiency is low, and cost is high, therefore needs to improve dewatered sludge mobility.
As the application number Chinese patent that is 201110183726.X discloses a kind of method and equipment thereof of Sewage Plant dewatered sludge first supercritical processing recycling, this patent proposes dewatered sludge to be stirred in advance to the mobility improving mud by high-speed stirring apparatus, but this needs additionally to increase high-speed mixing equipment, add energy consumption and cost, and the mobility of the more difficult lasting maintenance dewatered sludge of the method, application number be 200810063091.8 Chinese patent disclose the method for a kind of mud preparing hydrogen-rich gas by continuous catalysis gasification in supercritical water, this patent is deployed into mud to improve mud mobility by interpolation moisture and mud mix and blend, but this method reduce the transport efficiency of mud, change larger to dewatered sludge water ratio, application number be 201210205415.3 Chinese patent disclose the direct supercritical water gasification treatment unit of a kind of low-water-content dewatered sludge and method thereof, this patent proposes to carry out pre liquefied process to low-water-content dewatered sludge and improves mud mobility, realize the conveying of dewatered sludge, in its claims, " operating parameters of liquefying plant is: temperature 160 ~ 180 DEG C in restriction, pressure 1.2MPa, liquefying time 30 ~ 60min ", heat although this patent is the heat exchange method by reacting rear high-temperature product, but too increase heat exchanger simultaneously, reduce efficiency of utilization, application number be 201110084483.4 Chinese patent disclose a kind of method improving mobility of excess sludge in pipeline, this patent proposes digested sludge to mix with excess sludge, widen the size grading of sewage sludge solid particle to improve mobility of excess sludge, but dewatered sludge differs comparatively large with the water ratio of excess sludge, the method is not applicable in actual applications.The measure of current existing raising mud mobility or add energy consumption, or moisture percentage in sewage sludge is changed comparatively large, lack a kind of measure of raising dewatered sludge mobility lasting easily and effectively.
Dewatered sludge is in course of conveying, and it is crucial for how improving dewatered sludge mobility, and mobility improves can reduce dewatered sludge resistance to flow, saves a large amount of transmitting power consumption, solves a conveying difficult problem for high solid content fluid.
Summary of the invention
the technical problem solved:the object of the invention is to overcome the deficiencies in the prior art and a kind of method improving low-water-content dewatered sludge mobility in first supercritical processing is provided, the method can reduce dewatered sludge conveying energy consumption, promotes the application of dewatered sludge pipe transportation technology at engineering field.
technical scheme of the present invention:
The method improving low-water-content dewatered sludge mobility in first supercritical processing is as follows: before conveying dewatered sludge, bubble and dewatered sludge are mixed in proportion and stir, obtained bubble mixed dehydration mud; Wherein, bubble, dewatered sludge mix according to following weight percent:
Dewatered sludge 95% ~ 98%;
Bubble 2% ~ 5%;
Wherein, described bubble is greater than the bubble of 30min for the time of defoamed ratio required for 50%.
Bubble mixed dehydration mud carries out successively by following processing step:
1) whipping agent, suds-stabilizing agent and auxiliary agent mixing and stirring by a certain percentage used in the previous granted patent (03113372.X) of applicant is adopted, deployed solution to be foamed;
2) the previous granted patent (03221635.1 of applicant is adopted, a kind of bubble foaming device of earth working) in foam device used, add deployed frothing solution, utilize air compressor machine as the high quality bubble needed for impellent generation.
3) bubble is put in mixing tank again and carry out mix and blend with dewatered sludge, obtain bubble mixed dehydration mud, then with pump, alveolate for mixing dewatered sludge is transported in supercritical water gasification treatment unit.
The method of low-water-content dewatered sludge mobility in above-described raising first supercritical processing, the water ratio of described dewatered sludge is 74.2 ~ 86.1%.
The method of low-water-content dewatered sludge mobility in raising first supercritical processing described in above any one, the stirring velocity of described stirring is 55 ~ 125r/min, and churning time is 3 ~ 5min.
The method of low-water-content dewatered sludge mobility in above-described raising first supercritical processing, expansion ratio >=50 times of described bubble.
The method of low-water-content dewatered sludge mobility in above-described raising first supercritical processing, the stirring velocity of described stirring is 90r/min, and churning time is 5min.
In the present invention, when bubble defoamed ratio is 50%, required time can evaluate the stability of bubble, and the time required when the bubble defoamed ratio namely produced is 50%, the time is more of a specified duration, proves that bubble is more stable, is more not easy brokenly.
Principle of the present invention is mixed with the dewatered sludge of low-water-content by the Uniform Slender small bubbles of suitable proportion, and the bubble utilizing homogeneous tiny and sewage sludge solid particle adulterate mutually, reduces the mutual collision friction between mud granule; Simultaneously due to the intervention of bubble, the mud of mixing can be made compared with the dewatered sludge of equal water ratio to have less stickiness, and pipeline and and mud granule between friction resistance reduces, thus improve dewatered sludge mobility in the duct, reduction resistance to flow.
beneficial effect
Compared with prior art, advantage is as follows in the present invention:
First: the method is safe and reliable, simple, significantly can improve the mobility of dewatered sludge, degree of mobilization can improve 15% ~ 30%, reduces resistance to flow when utilizing Cemented filling;
Second: improving dewatered sludge mobility effect by the method can keep lastingly, hold-time >30min, and degree of mobilization maintains more than 95%, meets actual fed needs;
3rd: the method is low to material incorporation, improve mobility effective, have the feature of inexpensive easy realization, running cost is low.
Accompanying drawing explanation
Fig. 1 is bubble mixed dehydration mud mixing device structural representation;
Wherein, 1 is frothing solution hold-up vessel, and 2 is volume pumps, and 3 is check valves, and 4 is air compressor machines, and 5 is relief valves, and 6 is gas meters, and 7 is foam guns, and 8 is agitator motors, and 9 is sewage sludge storage tanks, and 10 is transferpumps.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Composition graphs 1, bubble mixed dehydration mud mixing device, comprises frothing solution hold-up vessel 1, volume pump 2, check valve 3, air compressor machine 4, relief valve 5, gas meter 6, foam gun 7, agitator motor 8, sewage sludge storage tank 9 and transferpump 10.Wherein, frothing solution hold-up vessel 1 delivery port is connected with foam gun 7 first input aperture with check valve 3 by volume pump 2 successively; Air compressor machine 4 delivery port is connected with foam gun 7 second input aperture with gas meter 6 by relief valve 5 successively.The frothing solution prepared is added in frothing solution hold-up vessel 1, by volume pump 2 and check valve 3 fixing quantity frothing solution flow; Air compressor machine 4, by relief valve 5 and gas meter 6 quantitatively stable output air pressure, mixes rapidly with frothing solution at foam gun 7 afterbody, pushes to the anterior stratum reticulare of foam gun 7 through air pressure, finally prepare the stable homogeneous bubble met the demands.
embodiment 1
The each component of the present invention mixes by following weight percent:
Dewatered sludge 98%
Bubble 2%
In the present embodiment, dewatered sludge water ratio is 86.1%, and measuring dewatered sludge degree of mobilization before adding is 119mm, and measuring dewatered sludge degree of mobilization after mixing and stirring is 138mm, degree of mobilization improves 16.0%, measuring the rear dewatered sludge degree of mobilization of mixing after 30min is 135mm, is 98% before, and degree of mobilization remains effective, wherein, when bubble defoamed ratio is 50%, required time is 64min, and stirring velocity is 55r/min, and churning time is 3min.
embodiment 2
The each component of the present invention mixes by following weight percent:
Dewatered sludge 96%
Bubble 4%
In the present embodiment, dewatered sludge water ratio is 77.1%, and measuring dewatered sludge degree of mobilization before adding is 104mm, and measuring dewatered sludge degree of mobilization after mixing is 130mm, degree of mobilization improves 25%, measuring the rear dewatered sludge degree of mobilization of mixing after 30min is 127mm, is 98% before, and degree of mobilization remains effective, wherein, when bubble defoamed ratio is 50%, required time is 64min, and stirring velocity is 125r/min, and churning time is 3min.
embodiment 3
The each component of the present invention mixes by following weight percent:
Dewatered sludge 95%
Bubble 5%
In the present embodiment, dewatered sludge water ratio is 74.2%, and measuring dewatered sludge degree of mobilization before adding is 99mm, and measuring dewatered sludge degree of mobilization after mixing is 131mm, degree of mobilization improves 32%, measuring the rear dewatered sludge degree of mobilization of mixing after 30min is 129mm, is 98% before, and degree of mobilization remains effective, wherein, when bubble defoamed ratio is 50%, required time is 64min, and stirring velocity is 90r/min, and churning time is 5min.
Claims (5)
1. improve the method for low-water-content dewatered sludge mobility in first supercritical processing, it is characterized in that, before conveying dewatered sludge, bubble and dewatered sludge are mixed in proportion and stir, obtained bubble mixed dehydration mud; Wherein, bubble, dewatered sludge mix according to following weight percent:
Dewatered sludge 95% ~ 98%
Bubble 2% ~ 5%;
Wherein, described bubble is greater than the bubble of 30min for the time of defoamed ratio required for 50%.
2. the method for low-water-content dewatered sludge mobility in raising first supercritical processing according to claim 1, it is characterized in that, the water ratio of described dewatered sludge is 74.2 ~ 86.1%.
3. the method for low-water-content dewatered sludge mobility in raising first supercritical processing according to claim 1 and 2, it is characterized in that, the stirring velocity of described stirring is 55 ~ 125r/min, and churning time is 3 ~ 5min.
4. the method for low-water-content dewatered sludge mobility in raising first supercritical processing according to claim 1 and 2, is characterized in that, expansion ratio >=50 times of described bubble.
5. the method for low-water-content dewatered sludge mobility in raising first supercritical processing according to claim 3, it is characterized in that, the stirring velocity of described stirring is 90r/min, and churning time is 5min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779966.XA CN104478180A (en) | 2014-12-17 | 2014-12-17 | Method for improving mobility of dewatered sludge with low moisture content in supercritical treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410779966.XA CN104478180A (en) | 2014-12-17 | 2014-12-17 | Method for improving mobility of dewatered sludge with low moisture content in supercritical treatment |
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| CN104478180A true CN104478180A (en) | 2015-04-01 |
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| CN201410779966.XA Pending CN104478180A (en) | 2014-12-17 | 2014-12-17 | Method for improving mobility of dewatered sludge with low moisture content in supercritical treatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI748154B (en) * | 2019-01-22 | 2021-12-01 | 鈺皓實業有限公司 | Material placement device of transport carrier |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717175A (en) * | 2009-12-03 | 2010-06-02 | 清华大学 | Constant-pressure muggy gasification and pyrolysis conditioning method of sludge in sewage plant |
| CN103058489A (en) * | 2013-01-16 | 2013-04-24 | 河海大学 | Method of sludge plate-frame pressure filtration deep dewatering by slurry regulation with air bubbles |
| CN103408208A (en) * | 2013-08-28 | 2013-11-27 | 范鹏辉 | Supercritical dissolved air cavitation device for reinforcing sludge reduction |
-
2014
- 2014-12-17 CN CN201410779966.XA patent/CN104478180A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717175A (en) * | 2009-12-03 | 2010-06-02 | 清华大学 | Constant-pressure muggy gasification and pyrolysis conditioning method of sludge in sewage plant |
| CN103058489A (en) * | 2013-01-16 | 2013-04-24 | 河海大学 | Method of sludge plate-frame pressure filtration deep dewatering by slurry regulation with air bubbles |
| CN103408208A (en) * | 2013-08-28 | 2013-11-27 | 范鹏辉 | Supercritical dissolved air cavitation device for reinforcing sludge reduction |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI748154B (en) * | 2019-01-22 | 2021-12-01 | 鈺皓實業有限公司 | Material placement device of transport carrier |
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Application publication date: 20150401 |