CN105330111A - Residual sludge drying method - Google Patents
Residual sludge drying method Download PDFInfo
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- CN105330111A CN105330111A CN201410405125.2A CN201410405125A CN105330111A CN 105330111 A CN105330111 A CN 105330111A CN 201410405125 A CN201410405125 A CN 201410405125A CN 105330111 A CN105330111 A CN 105330111A
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Abstract
The invention relates to a residual sludge drying method. The method comprises the following steps: concentrating the residual sludge and performing ultrasonic disintegration, then performing anaerobic fermentation, pre-pressing the sludge under vacuum and performing freeze drying on the sludge. After the ultrasonic processing step, sludge volume is greatly reduced, difficulty for processing sludge in the subsequent step is reduced, residual sludge bacterium and insect cell wall can be destroyed, biological activity of anacerobe is increased, and a total COD amount of the sludge can be reduced through anaerobic digestion. Free water in sludge can be extracted by pre-pressing under vacuum, so that energy required by freeze drying can be reduced, the freeze drying step can change hydration water in sludge to free water, and can form gaps in the sludge. In the method, the step of pre-pressing under vacuum and the step of freeze drying are mutually promoted so that sludge drying effect can be increased.
Description
Technical field
The present invention relates to solid waste disposal technical field, be specifically related to a kind of method of excess sludge mummification.
Background technology
In various industry process and life activity, discharge a large amount of waste water, Application comparison is microbiological treatment generally, and produces a large amount of mud in antimicrobial treatment process, and the process disposal costs of mud is high, substantially increases the cost of wastewater treatment.In addition in specific resistance to filtration process, also can produce new environmental problem.Therefore, the minimizing of mud receives the concern of people.Traditional sludge treatment mainly adopts concentrated, dehydration and the measure such as drying to reduce the water ratio of mud, and then reduces mud volume, so that follow-up mud transport and disposing.This traditional mud end treatment technology, not only processing costs is expensive, increases construction and the running cost of sewage work, and fundamentally cannot reduce the amount of dry matter of mud, still bring immense pressure to follow-up sludge ultimate disposal.Therefore, increasing research starts to be conceived to reduce excess sludge generation from source.
Sludge drying handling principle directly or indirectly provides transpiring moisture heat to mud, taken away the moisture in mud by air flowing.In recent years, sludge drying processing method receives the attention of numerous scholar, and mummification not only can make the volume of mud reduce, and the stink can cutting down mud and the pathogenic bacterium killed in mud.Mud after mummification can be used for brickmaking, do fuel and overburden soil.At present, sludge drying technique is mostly heat drying technology.Conventional sludge heat drying equipment has rotary drum drying device, multi-disc type moisture eliminator, fluidized-bed drying device, flash type dryers, spiral moisture eliminator, film type moisture eliminator etc.
The domestic and international research to Sludge Reduction Technologies at present mainly concentrates on several aspects such as the predation improving technique, the molten born of the same parents' technology of promotion mud, uncoupling technology and utilize microfauna in food chain.The cardinal principle of molten born of the same parents' technology adopts the method such as physics, chemistry (such as O
3oxidation, thermal treatment, ultrasonic wave) to promote that " dissolving " of cell realizes the minimizing of mud, and ultrasonic wave is wherein due to its lignin-sludge Be very effective, thus receives extensive concern.
Summary of the invention
The object of the invention is to a kind of method proposing excess sludge mummification for the handling problems of existing excess sludge, the process of existing excess sludge is improved, promote the minimizing of excess sludge, to meet the overall requirement of sewage disposal.
For reaching this object, the present invention by the following technical solutions:
A method for excess sludge mummification, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, carry out ultrasonic disintegration;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting, add coagulating agent and concentrate;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing;
(5) mud is thawed;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work.
In mud, by the power of water and mud diamond retention, be divided into four kinds of water: strong planar water, the water be namely combined with mud particle electrostatic double layer; Weakly stable water, the water namely adsorbed with diffusion layer in electrostatic double layer; Capillary water, is namely present in the water in pore between mud particle; Free water, comprises free gravity water and backlash freedom water.Ultrasonic disintegration can make sludge volume reduce in a large number, decreases the difficulty of follow-up sludge treatment, can destroy excess sludge bacterium, worm cell walls, improves the biological activity of anerobe; Anaerobically fermenting can reduce the volume of mud, carries out deodorizing to mud simultaneously; Vacuum preloading can extract the free water in mud, thus can reduce freezing required energy.Freezingly the Bound moisture in mud not only can be made to become free water, can also make to form space in mud, thus improve the efficiency of vacuum preloading.Vacuum preloading and freezingly to mutually promote, the common effect improving sludge drying.
The various mud of described excess sludge for producing after urban wastewater treatment.
The temperature of described ultrasonic disintegration is 15 ~ 130 DEG C, such as, can select 15.02 ~ 128 DEG C, 18 ~ 120.4 DEG C, 25 ~ 108 DEG C, 40 ~ 100 DEG C, 48.5 ~ 80.6 DEG C, 60 ~ 80 DEG C, 64.5 ~ 75.8 DEG C, 68 ~ 72 DEG C, 70.5 DEG C etc., preferably 35 ~ 80 DEG C, preferably 50 DEG C further.
The action time of described ultrasonic disintegration is 8 ~ 45min, such as, can select 8.2 ~ 44.7min, 10 ~ 42min, 14.6 ~ 40min, 18 ~ 37.9min, 20.3 ~ 34min, 24 ~ 30.1min, 27.6min etc., preferably 20 ~ 36min, further preferred 25min.
The described anaerobically fermenting temperature of step (2) is 35 ~ 50 DEG C, such as, can select 35.02 ~ 49.8 DEG C, 37 ~ 46 DEG C, 38.9 ~ 44.7 DEG C, 40 ~ 43 DEG C, 42.1 DEG C etc., preferably 40 ~ 45 DEG C further.
Residence time of anaerobically fermenting is at least 4d, such as, can select 4.2d, 6d, 10d, 15.3d etc., further preferably 5 ~ 12d, most preferably 10d.
By the control to parameter in excess sludge fermenting process, the volume reducing mud can be realized better, and mud is carried out to the effect of deodorizing.
After refrigeration process described in step (4), the temperature of mud is not higher than 0 DEG C.All moisture now in mud are all sufficiently frozen, and the Bound moisture after thawing in mud becomes free water, are conducive to the suction filtration of moisture.
After process of thawing described in step (5), the temperature of mud is not less than 2 DEG C.Moisture now in mud exists all in liquid form, is conducive to the carrying out of vacuum preloading.
In actually operating, the gaseous combustion that the described processing and utilizing anaerobically fermenting that thaws produces produces superheated vapour, then utilizes the superheated vapour pipeline that passes through to thaw to thaw to mud.If the superheated vapour produced is not enough to make mud thaw, then the hot water passing into 80 ~ 95 DEG C in pipeline continues to thaw to mud.
Specifically, a kind of method of excess sludge mummification, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, at 15 ~ 130 DEG C, carry out ultrasonic disintegration 8 ~ 45min;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting at 35 ~ 50 DEG C, add coagulating agent and concentrate; Residence time of anaerobically fermenting is at least 4d;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing; After refrigeration process, the temperature of mud is not higher than 0 DEG C;
(5) mud is thawed; The temperature of the rear mud of process of thawing is not less than 2 DEG C;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work and check and accept.
Compared with prior art scheme, the present invention has following beneficial effect:
After supersound process of the present invention, sludge volume is reduced in a large number, decrease the difficulty of follow-up sludge treatment, excess sludge bacterium, worm cell walls can be destroyed, improve the biological activity of anerobe, reduce the total COD amount of mud through anaerobic digestion.
Vacuum preloading can extract the free water in mud, thus can reduce the energy needed for lyophilize; And lyophilize not only can make the Bound moisture in mud become free water, can also make to form space in mud.Vacuum preloading and lyophilize are mutually promoted, the common effect improving sludge drying.
The present invention is described in more detail below.But following example is only simple and easy example of the present invention, and do not represent or limit the scope of the present invention, protection scope of the present invention is as the criterion with claims.
Embodiment
Technical scheme of the present invention is further illustrated below by embodiment.
For better the present invention being described, be convenient to understand technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:
Embodiment 1
A method for excess sludge mummification, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, at 130 DEG C, carry out ultrasonic disintegration 8min;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting at 50 DEG C, add coagulating agent and concentrate; The residence time of anaerobically fermenting is 4d;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing; After refrigeration process, the temperature of mud is not higher than 0 DEG C;
(5) mud is thawed; The temperature of the rear mud of process of thawing is not less than 2 DEG C;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work and check and accept.
Embodiment 2
A method for excess sludge mummification, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, at 15 DEG C, carry out ultrasonic disintegration 45min;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting at 35 DEG C, add coagulating agent and concentrate; The residence time of anaerobically fermenting is 10d;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing; After refrigeration process, the temperature of mud is not higher than 0 DEG C;
(5) mud is thawed; The temperature of the rear mud of process of thawing is not less than 2 DEG C;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work and check and accept.
Embodiment 3
A method for excess sludge mummification, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, at 35 DEG C, carry out ultrasonic disintegration 36min;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting at 40 DEG C, add coagulating agent and concentrate; The residence time of anaerobically fermenting is 8d;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing; After refrigeration process, the temperature of mud is not higher than 0 DEG C;
(5) mud is thawed; The temperature of the rear mud of process of thawing is not less than 2 DEG C;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work and check and accept.
Embodiment 4
A method for excess sludge mummification, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, at 80 DEG C, carry out ultrasonic disintegration 20min;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting at 45 DEG C, add coagulating agent and concentrate; The residence time of anaerobically fermenting is 5d;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing; After refrigeration process, the temperature of mud is not higher than 0 DEG C;
(5) mud is thawed; The temperature of the rear mud of process of thawing is not less than 2 DEG C;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work and check and accept.
Embodiment 5
A method for excess sludge mummification, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, at 50 DEG C, carry out ultrasonic disintegration 25min;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting at 46 DEG C, add coagulating agent and concentrate; The residence time of anaerobically fermenting is 12d;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing; After refrigeration process, the temperature of mud is not higher than 0 DEG C;
(5) mud is thawed; The temperature of the rear mud of process of thawing is not less than 2 DEG C;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work and check and accept.
Applicant states, the present invention illustrates method of the present invention by above-described embodiment, but the present invention is not limited to aforesaid operations step, does not namely mean that the present invention must rely on aforesaid operations step and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of raw material selected by the present invention, all drops within protection scope of the present invention and open scope.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (8)
1. a method for excess sludge mummification, is characterized in that, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, carry out ultrasonic disintegration;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting, add coagulating agent and concentrate;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing;
(5) mud is thawed;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work.
2. the method for claim 1, is characterized in that, the various mud of described excess sludge for producing after urban wastewater treatment.
3. method as claimed in claim 1 or 2, it is characterized in that, the temperature of described ultrasonic disintegration is 15 ~ 130 DEG C, preferably 35 ~ 80 DEG C, preferably 50 DEG C further.
4. the method as described in one of claim 1-3, is characterized in that, the action time of described ultrasonic disintegration is 8 ~ 45min, preferably 20 ~ 36min, further preferred 25min.
5. the method as described in one of claim 1-4, is characterized in that, the described anaerobically fermenting temperature of step (2) is 35 ~ 50 DEG C, preferably 40 ~ 45 DEG C further;
Preferably, residence time of anaerobically fermenting is at least 4d, further preferably 5 ~ 12d, most preferably 10d.
6. the method as described in one of claim 1-5, is characterized in that, after the refrigeration process described in step (4), the temperature of mud is not higher than 0 DEG C.
7. the method as described in one of claim 1-6, is characterized in that, after the process of thawing described in step (5), the temperature of mud is not less than 2 DEG C.
8. the method as described in one of claim 1-7, is characterized in that, said method comprising the steps of:
(1) excess sludge is carried out initial concentration, after concentrated, at 15 ~ 130 DEG C, carry out ultrasonic disintegration 8 ~ 45min;
(2) mud after ultrasonic disintegration is carried out anaerobically fermenting at 35 ~ 50 DEG C, add coagulating agent and concentrate; Residence time of anaerobically fermenting is at least 4d;
(3) be evacuated to mud overall moisture content and reach about 80%;
(4) refrigeration process is carried out to the mud after vacuumizing; After refrigeration process, the temperature of mud is not higher than 0 DEG C;
(5) mud is thawed; The temperature of the rear mud of process of thawing is not less than 2 DEG C;
(6) to the mud after thawing again be evacuated to aquifer yield obviously less and moisture percentage in sewage sludge remains unchanged substantially time stop work and check and accept.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405125.2A CN105330111A (en) | 2014-08-15 | 2014-08-15 | Residual sludge drying method |
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| CN201410405125.2A CN105330111A (en) | 2014-08-15 | 2014-08-15 | Residual sludge drying method |
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| CN105330111A true CN105330111A (en) | 2016-02-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219873A (en) * | 2016-08-23 | 2016-12-14 | 沈阳东源环境科技有限公司 | A kind of milk processing factory method of wastewater treatment |
| CN107381999A (en) * | 2017-07-17 | 2017-11-24 | 天津大学 | A kind of deep dehydration method for sludge |
-
2014
- 2014-08-15 CN CN201410405125.2A patent/CN105330111A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219873A (en) * | 2016-08-23 | 2016-12-14 | 沈阳东源环境科技有限公司 | A kind of milk processing factory method of wastewater treatment |
| CN106219873B (en) * | 2016-08-23 | 2019-10-11 | 沈阳东源环境科技有限公司 | A kind of milk processing factory's wastewater treatment method |
| CN107381999A (en) * | 2017-07-17 | 2017-11-24 | 天津大学 | A kind of deep dehydration method for sludge |
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Application publication date: 20160217 |