CN105417930A - Method for lowering viscosity of high-solid-concentration sludge - Google Patents
Method for lowering viscosity of high-solid-concentration sludge Download PDFInfo
- Publication number
- CN105417930A CN105417930A CN201510814558.8A CN201510814558A CN105417930A CN 105417930 A CN105417930 A CN 105417930A CN 201510814558 A CN201510814558 A CN 201510814558A CN 105417930 A CN105417930 A CN 105417930A
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- Prior art keywords
- mud
- viscosity
- solid
- sludge
- concentration
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Classifications
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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
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention discloses a method for lowering viscosity of high-solid-concentration sludge so as to promote anaerobic digestion and methanogenesis. The method comprises the steps that sludge with the solid concentration of 16-20% is obtained and placed at the temperature not lower than 95 DEG C to be treated for 10 min. By means of the method, the viscosity of the sludge with the solid concentration reaching up to 16-20% can be effectively lowered, the treated sludge can be directly subjected to anaerobic fermentation, the methanogenesis rate is high, and the industrial application prospect is good.
Description
Technical field
The present invention relates to a kind of method reducing the viscosity of high solid concentration mud.
Background technology
Mud refers to the semi-solid state or solid matter that produce in sewage treatment process.At present, in China, the general technology flow process of sewage disposal is: anaerobic treatment → denitrogenation → aerobic treatment.When aerobic treatment, NH
4 +be oxidized to NO
3 -, containing NO
3 -liquid be returned to denitrifying tank, by NO
3 -be reduced to N
2.A mud part is returned to anaerobic treatment groove, and rest part concentrates.At concentration section, add after polymeric flocculant and dewater with belt press, obtain moisture be about 80% thickened sludge.Sewage load 100, the thickened sludge quantity discharged of the sewage work of 000 ton/day is 60-80 ton/sky (0.06-0.08% of sewage quantity).This thickened sludge (moisture about 80%) is respectively 3,000 ten thousand tons and 550,000 tons at the annual emissions in the whole nation and Chengdu.
The processing mode of thickened sludge comprises landfill, burning, aerobic sigestion, anaerobic digestion etc., usually adopts the mode process of landfill, burning at present.But, because thickened sludge is still containing large quantity of moisture, large for burning power consumption, as incineration temperature do not reach more than 800 DEG C time, easily produce the secondary pollutant of dioxin; In addition, can cause leachate contamination ground water regime because thickened sludge is used for landfill, the landfill of thickened sludge is restricted.
Anaerobic digestion a kind ofly realizes sludge reduction, innoxious effective means, and the biogas of generation may be used for burning in boiler steam or generating, and non-secondary pollution produce are raw.But current anaerobic digestion techniques process is without concentrated mud, and its concentration is generally lower than 10%, and the processing power of the retort unit volume of this kind of processing mode is low, the high cost of process.
But for thickened sludge, its solid content is that more than 15% viscosity is very large, and when utilizing the process of bio anaerobic digestion method, stir difficulty, energy consumption is large, and efficiency is low.
Therefore, the viscosity how effectively reducing high solid concentration thickened sludge has solution to be solved.
Summary of the invention
The object of the present invention is to provide a kind of viscosity reducing high solid concentration mud, thus promote the methanogenic treatment process of its anaerobic digestion, effectively to process the thickened sludge of high solids content.
Reduce the method for the viscosity of high solid concentration mud, step is as follows: get the mud that solid holdup is 16 ~ 20%, is placed under temperature is not less than the condition of 95 DEG C and processes 10min.
Preferably, described temperature is 95 ~ 140 DEG C.
Further preferably, described temperature is 100 ~ 140 DEG C.
Again further preferably, described temperature is 120 ~ 140 DEG C.
The inventive method can effectively reduce solid holdup up to 16 ~ 20% the viscosity of mud, the mud after process is directly used in anaerobically fermenting, and its methane production rate is high, and prospects for commercial application is good.
Obviously, according to foregoing of the present invention, according to ordinary technical knowledge and the customary means of this area, not departing under the present invention's above-mentioned basic fundamental thought prerequisite, the amendment of other various ways, replacement or change can also be made.
The embodiment of form by the following examples, is described in further detail foregoing of the present invention again.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following example.All technology realized based on foregoing of the present invention all belong to scope of the present invention.
Embodiment
Embodiment 1 the present invention reduces the method for the viscosity of high solid concentration mud
1, raw material
Thickened sludge, water content is 80% (solid holdup is 20%), comes from Shuangliu County, Sichuan Province airport sewage work.
2, treatment process
Get thickened sludge 400g, process 10min according under following table 1 temp. displaying function.
3, detection method
Utilize viscometer (manufacturer: eastern machine industry; Model: TVB-10) measure the viscosity processing rear mud sample.
4, result
Table 1 treatment process of the present invention and result
As shown in table 1, the viscosity of untreated mud is excessive, cannot effectively detect its viscosity at all; And adopting the inventive method process, viscosity obviously reduces, and within the scope of the present invention, along with the rising of temperature, viscosity reduces gradually.
To the sample after thermal treatment, add the digested sludge after raising and train as seed, with the biochemical methane potential of sample after full-automatic Biochemical Methane Potential analytical system test processes.Test system total mass is 400g, wherein comprises sample 43g, mud seed 200g, distilled water 157g, tests and maintains 33 hours in 53 DEG C.With only adding the test of mud seed as blank group, its methane production is 113mL.The methane production that control group adds the sewage concentration mud product of not heat-treating is 378.9mL (=491.9ml-113ml), the methane production that test group 1 adds the sewage concentration mud of 95 DEG C of process is 412.9ml (=525.9ml-113ml), the methane production that test group 2 adds the sewage concentration mud of 100 DEG C of process is 424.3ml (=537.3ml-113ml), the methane production that test group 3 adds the sewage concentration mud of 120 DEG C of process is 488.6ml (=601.6ml-113ml), the methane production that test group 4 adds the sewage concentration mud of 140 DEG C of process is 518.9ml (=631.9ml-113ml).As can be seen here, methane production increases with the rising of temperature.Compared with untreated sample, sewage concentration mud methane production after 95 ~ 140 DEG C of process adds 9 ~ 37%.
Embodiment 2 the present invention reduces the method for the viscosity of high solid concentration mud
1, raw material
Thickened sludge, water content is 84% (solid holdup is 16%), comes from Shuangliu County, Sichuan Province airport sewage work.
2, treatment process
Pre-treatment: get thickened sludge, processes 10min according under following table 2 temp. displaying functions.
3, detection method
Utilize viscometer (manufacturer: eastern machine industry; Model: TVB-10) measure the viscosity processing rear mud sample.
4, result
Table 2 treatment process of the present invention and result
As shown in table 2, the viscosity of untreated mud is excessive, cannot effectively detect its viscosity at all; And adopting the inventive method process, viscosity obviously reduces, and within the scope of the present invention, along with the rising of temperature, viscosity reduces gradually.
To the sample after thermal treatment, add the digested sludge after raising and train as seed, with the biochemical methane potential of sample after full-automatic Biochemical Methane Potential analytical system test processes.Test system total mass is 400g, wherein comprises sample 49g, mud seed 200g, distilled water 151g, tests and maintains 30 hours in 53 DEG C.With only adding the test of mud seed as blank group, its methane production is 83mL.The methane production that control group adds the sewage concentration mud product of not heat-treating is 318.9mL (=401.9ml-83ml), the methane production that test group 1 adds the sewage concentration mud of 95 DEG C of process is 366.3ml (=449.3ml-83ml), the methane production that test group 2 adds the sewage concentration mud of 100 DEG C of process is 374.0ml (=457.0ml-83ml), the methane production that test group 3 adds the sewage concentration mud of 120 DEG C of process is 396.5ml (=479.5ml-83ml), the methane production that test group 4 adds the sewage concentration mud of 140 DEG C of process is 417.8ml (=500.76ml-83ml).As can be seen here, methane production increases with the rising of temperature.Compared with untreated sample, sewage concentration mud methane production after 140 DEG C of process adds 15 ~ 31%.
To sum up, the inventive method can effectively reduce solid holdup up to 16 ~ 20% the viscosity of mud, the mud after process is directly used in anaerobically fermenting, and its methane production rate is high, and prospects for commercial application is good.
Claims (4)
1. reduce a method for the viscosity of high solid concentration mud, it is characterized in that: step is as follows: get the mud that solid holdup is 16 ~ 20%, be placed under temperature is not less than the condition of 95 DEG C and process 10min.
2. method according to claim 1, is characterized in that: described temperature is 95 ~ 140 DEG C.
3. method according to claim 2, is characterized in that: described temperature is 100 ~ 140 DEG C.
4. method according to claim 3, is characterized in that: described temperature is 120 ~ 140 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510814558.8A CN105417930A (en) | 2015-11-20 | 2015-11-20 | Method for lowering viscosity of high-solid-concentration sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510814558.8A CN105417930A (en) | 2015-11-20 | 2015-11-20 | Method for lowering viscosity of high-solid-concentration sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105417930A true CN105417930A (en) | 2016-03-23 |
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|---|---|---|---|
| CN201510814558.8A Pending CN105417930A (en) | 2015-11-20 | 2015-11-20 | Method for lowering viscosity of high-solid-concentration sludge |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003275789A (en) * | 2002-03-22 | 2003-09-30 | Kurita Water Ind Ltd | Method for anaerobic digestion of organic waste liquid and anaerobic digestion device |
| CN102180576A (en) * | 2011-03-17 | 2011-09-14 | 同济大学 | Advanced dry anaerobic digestion method based on sludge modification pretreatment |
| CN102417285A (en) * | 2011-10-20 | 2012-04-18 | 同济大学 | Continuous pyrohydrolysis device and method for high-solid-content biological sludge |
| CN103011542A (en) * | 2012-12-13 | 2013-04-03 | 清华大学 | Anaerobic digestion device and process for pre-treating sludge with high solid content by heating method |
| CN103936251A (en) * | 2014-04-03 | 2014-07-23 | 西安交通大学 | Sludge dewatering system based on thermal hydrolysis technology and sludge dewatering process based on thermal hydrolysis technology |
-
2015
- 2015-11-20 CN CN201510814558.8A patent/CN105417930A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003275789A (en) * | 2002-03-22 | 2003-09-30 | Kurita Water Ind Ltd | Method for anaerobic digestion of organic waste liquid and anaerobic digestion device |
| CN102180576A (en) * | 2011-03-17 | 2011-09-14 | 同济大学 | Advanced dry anaerobic digestion method based on sludge modification pretreatment |
| CN102417285A (en) * | 2011-10-20 | 2012-04-18 | 同济大学 | Continuous pyrohydrolysis device and method for high-solid-content biological sludge |
| CN103011542A (en) * | 2012-12-13 | 2013-04-03 | 清华大学 | Anaerobic digestion device and process for pre-treating sludge with high solid content by heating method |
| CN103936251A (en) * | 2014-04-03 | 2014-07-23 | 西安交通大学 | Sludge dewatering system based on thermal hydrolysis technology and sludge dewatering process based on thermal hydrolysis technology |
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Application publication date: 20160323 |
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