CN104761111B - A kind of method of powdered rice hulls conditioning sludge incineration slag preparation and conditioning municipal sludge thereof - Google Patents
A kind of method of powdered rice hulls conditioning sludge incineration slag preparation and conditioning municipal sludge thereof Download PDFInfo
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- CN104761111B CN104761111B CN201510175023.0A CN201510175023A CN104761111B CN 104761111 B CN104761111 B CN 104761111B CN 201510175023 A CN201510175023 A CN 201510175023A CN 104761111 B CN104761111 B CN 104761111B
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Abstract
The method that the invention discloses the conditioning sludge incineration slag preparation of a kind of powdered rice hulls and conditioning municipal sludge, belongs to technical field of environmental management. The method includes: add a certain amount of powdered rice hulls and iron chloride in a certain amount of municipal sludge according to certain order of adding and mixing speed; By the sludge filtration dehydration after conditioning, obtain sludge cake; Sludge cake is burned under uniform temperature and time, prepares powdered rice hulls conditioning sludge incineration slag; Utilize prepared powdered rice hulls conditioning sludge incineration slag conditioning municipal sludge, improve its dewatering. The powdered rice hulls conditioning sludge incineration slag preparation method of the present invention is effectively saved preparation time and energy consumption, and the sludge incineration slag of powdered rice hulls conditioning simultaneously can be obviously improved the dewatering of mud, and dewatered sludge moisture content of the cake reaches 70-75%. The present invention is with low cost, technique is simple, to solving environmental pollution, promoting that the treatment of wastes with processes of wastes against one another is significant.
Description
Technical field
The invention belongs to technical field of environmental management, the method for the preparation of sludge incineration slag and conditioning municipal sludge thereof after nursing one's health particularly to a kind of powdered rice hulls.
Background technology
Municipal sludge is owing to yield is high, volume is big, character is complicated and environment and human health are existed harm, it is therefore necessary to carries out processing to it and disposes. Mud is characterized by having high-moisture (up to more than 99%) the most significantly, flocculation structure loosens and in flow regime, for the long distance delivery of mud and subsequent treatment bring economically with technical difficulty, therefore effectively dehydration is the key of Treatment of Sludge. But, excess sludge is as a kind of high-ductility fluid, and compressibility extreme difference, after Direct Dehydration, moisture percentage in sewage sludge remains in more than 90%. Sludge conditioning, by improving dewatering performance of sludge, promotes sludge dewatering, lays the foundation for mud subsequent treatment and utilization, be the study hotspot of domestic and international lasting for years.
Urban sludge conditioning process is a lot, can be generally divided into Physical, chemical method and bioanalysis three major types. Chemical conditioning in sludge conditioning method because the change of sludge quantity and sludge quality there being the stronger suitability, and easy and simple to handle, effective, the process cycle is short, investment operating cost is low etc. and is used widely. Mud add on the basis of specified chemical conditioner (iron chloride, PAMC etc.), add some inorganic or organic granulars, if brown coal, flyash, wood sawdust etc. are as skeleton, these granules make mud flco more closely knit persistently, advantageously form the mud of easy dehydration; These skeletons can make sludge cake keep porous simultaneously, and what form water goes out circulation road, and stops flco to collapse, and reduces the compressibility of mud cake, thus improving the dewatering of mud.Therefore development of new is efficient, safe, economical sludge conditioner and skeleton thing are sludge dewatering research emphasis.
At present, the research utilizing sludge incineration slag conditioning mud is less, and Luo Haijian et al. have studied the impact on industrial sludge dewatering of the sludge incineration bottom ash, and result shows that sludge incineration slag improves the dewatering of industrial sludge to a certain extent. Existing research all adopts raw sewage bottom ash to study, owing to raw sewage dewatering is poor, mud drying time is longer, Energy Consumption Cost is higher, simultaneously, raw sewage calorific value is relatively low, sludge incineration needs to consume certain combustion adjuvant, and therefore the preparation of raw sewage incineration slag needs higher fund and time to put into. What this patent proposed utilizes powdered rice hulls to combine the method that inorganic flocculating agent iron chloride nurses one's health raw sewage, dewatering performance of sludge can be effectively improved, save mud drying time, simultaneously because the powdered rice hulls composition in mud can serve as the combustion adjuvant of sludge incineration after conditioning, cost and the energy consumption of sludge incineration can be substantially reduced, thus realizing the treatment of wastes with processes of wastes against one another, saving the purpose of the energy, there is provided new outlet for the recycling of mud after rice husk and conditioning, there is the benefit of good economy, society and environment.
Summary of the invention
The technical problem to be solved is: overcome the deficiency in existing sludge conditioning technology, it is provided that what a kind of technique was simple, with low cost, respond well nurses one's health the preparation of sludge incineration slag and the method for conditioning municipal sludge thereof.
For achieving the above object, the present invention is by the following technical solutions:
The preparation method of a kind of powdered rice hulls provided by the invention conditioning sludge incineration slag, described powdered rice hulls conditioning sludge incineration slag adopts burning method to prepare, and comprises the following steps:
(1) take a certain amount of raw sewage, add the powdered rice hulls of 65%-70% mud dry weight, stir 20-40s with 250-350rpm;
(2) under the stirring condition of 40-60rpm, in above-mentioned mud, continue to add the iron chloride of 115.07-138.09g/kg mud dry weight, stir 2-4min;
(3) by the sludge filtration dehydration after above-mentioned conditioning, the sludge cake obtained is dried at 100-120 DEG C;
(4) sludge cake after drying is burned 1-3h at 350-450 DEG C;
(5) mill and sieve after the residual solids natural cooling after burning, obtain described powdered rice hulls conditioning dirt
Mud incineration slag, powdered rice hulls conditioning sludge incineration slag be sized to 80-250 ��m.
The method of powdered rice hulls of the present invention conditioning sludge incineration slag conditioning municipal sludge, comprises the following steps:
Take a certain amount of raw sewage, add the powdered rice hulls conditioning sludge incineration slag of 65%-70% mud dry weight, stir 20-40s with 250-350rpm; In above-mentioned mud, continue to add the iron chloride of 115.07-138.09g/kg mud dry weight again, stir 2-4min with 40-60rpm; Then mud is filtered dehydration.
The described powdered rice hulls in powdered rice hulls conditioning sludge incineration slag preparation takes from common grain processing plant's rice husk, is milled into powdered rice hulls after drying, and powdered rice hulls is sized to 109-150 ��m.
Mud in described powdered rice hulls conditioning sludge incineration slag preparation and conditioning municipal sludge method thereof is the excess sludge of sludge from wastewater treatment plant concentration basin.
It is an advantage of the current invention that: cost and difficulty prepared by the powdered rice hulls conditioning sludge incineration slag of the present invention are substantially reduced, and powdered rice hulls conditioning sludge incineration slag is far superior to raw sewage incineration slag in improving the dewatering of municipal sludge, compared with the mud singly adding iron chloride conditioning, sludge specific resistance decline 60%-67%, the clean productivity of mud improves 37%-52%, and moisture content of the cake reaches 70-75%.And operational approach of the present invention is simple, practical, for solving environmental pollution, to realize the treatment of wastes with processes of wastes against one another significant.
Detailed description of the invention:
Below by specific embodiment, the present invention is expanded on further, but is not limiting as the present invention.
Rice husk used in the present embodiment takes from Changsha grain processing plant rice husk, powdered rice hulls it is milled into after drying, powdered rice hulls is sized to 109-150 ��m, mud used by embodiment 1, embodiment 2 and embodiment 3 takes from the excess sludge of Changsha the second sewage treatment plant, raw sewage moisture content is 98.9-99.5%, mud used by embodiment 4 takes from the excess sludge of Changsha the first sewage treatment plant, and raw sewage moisture content is 98.2-99.3%.
Embodiment 1:
(1) take a certain amount of raw sewage, add the powdered rice hulls of 65% mud dry weight, stir 30s with 350rpm;
(2) under the stirring condition of 40rpm, in above-mentioned mud, continue to add the iron chloride of 138.09g/kg mud dry weight, stir 3min;
(3) by the sludge filtration dehydration after above-mentioned conditioning, the sludge cake obtained is dried at 105 DEG C;
(4) sludge cake after drying is burned 1h at 400 DEG C;
(5) sieve milling after the residual solids natural cooling after burning, obtain described powdered rice hulls conditioning mud
Incineration slag, powdered rice hulls conditioning sludge incineration slag be sized to 80-250 ��m.
The powdered rice hulls conditioning sludge incineration slag prepared by embodiment 1 carries out the sludge conditioning in following 2-4.
Embodiment 2: take a certain amount of raw sewage, the powdered rice hulls conditioning sludge incineration slag of embodiment 1 preparation adding 68% mud dry weight carries out sludge conditioning, stirs 30s with 350rpm; In above-mentioned mud, continue to add the iron chloride of 138.09g/kg mud dry weight again, stir 3min with 40rpm; Then the mud after conditioning is filtered dehydration. Acquired results is as follows: raw sewage resistivity is 1.20 �� 1013M/kg, the clean productivity of mud is 1.94kg/ (m2H), after singly adding iron chloride, sludge specific resistance is 1.51 �� 1012M/kg, the clean productivity of mud is 18.99kg/ (m2H), 5.45 �� 10 are dropped to the sludge specific resistance of powdered rice hulls conditioning sludge incineration slag conditioning11M/kg, the clean productivity of mud rises to 26.27kg/ (m2H), filter cake moisture content is dropped to 72.9% by original 92.71%.
Embodiment 3: take a certain amount of raw sewage, the powdered rice hulls conditioning sludge incineration slag of embodiment 1 preparation adding 70% mud dry weight carries out sludge conditioning, stirs 30s with 350rpm; In above-mentioned mud, continue to add the iron chloride of 138.09g/kg mud dry weight again, stir 3min with 40rpm; Then the mud after conditioning is filtered dehydration. Acquired results is as follows: raw sewage resistivity is 1.75 �� 1013M/kg, the clean productivity of mud is 1.47kg/ (m2H), after singly adding iron chloride, sludge specific resistance is 1.46 �� 1012M/kg, the clean productivity of mud is 14.18kg/ (m2H), 4.87 �� 10 are dropped to the sludge specific resistance of powdered rice hulls conditioning sludge incineration slag conditioning11M/kg, the clean productivity of mud rises to 21.60kg/ (m2H). Filter cake moisture content is dropped to 71.17% by 93.88%.
Embodiment 4: take a certain amount of raw sewage, the powdered rice hulls conditioning sludge incineration slag of embodiment 1 preparation adding 73% mud dry weight carries out sludge conditioning, stirs 30s with 350rpm; In above-mentioned mud, continue to add the iron chloride of 138.09g/kg mud dry weight again, stir 3min with 40rpm; Then the mud after conditioning is filtered dehydration. Acquired results is as follows: raw sewage resistivity is 9.05 �� 1012M/kg, the clean productivity of mud is 2.73kg/ (m2H), after singly adding iron chloride, sludge specific resistance is 4.19 �� 1011M/kg, the clean productivity of mud is 21.70kg/ (m2H), 1.35 �� 10 are dropped to the sludge specific resistance of powdered rice hulls conditioning sludge incineration slag conditioning11M/kg, the clean productivity of mud rises to 29.83kg/ (m2H).Filter cake moisture content is dropped to 70.72% by 90.63%.
Claims (4)
1. the preparation method of a powdered rice hulls conditioning sludge incineration slag, it is characterised in that described powdered rice hulls conditioning sludge incineration slag adopts burning method to prepare, and comprises the following steps:
(1) take a certain amount of raw sewage, add the powdered rice hulls of 65%-70% mud dry weight, stir 20-40s with 250-350rpm;
(2) under the stirring condition of 40-60rpm, in above-mentioned mud, continue to add the iron chloride of 115.07-138.09g/kg dewatered sludge quality, stir 2-4min;
(3) by the sludge filtration dehydration after above-mentioned conditioning, the sludge cake obtained is dried at 100-120 DEG C;
(4) sludge cake after drying is burned 1-3h at 350-450 DEG C;
(5) mill and sieve after the residual solids natural cooling after burning, obtain described powdered rice hulls conditioning sludge incineration slag, powdered rice hulls conditioning sludge incineration slag be sized to 80-250 ��m.
2. the method for powdered rice hulls conditioning sludge incineration slag conditioning municipal sludge as claimed in claim 1, it is characterized in that, take a certain amount of raw sewage, the conditioning sludge incineration slag of the powdered rice hulls described in claim 1 adding 65%-75% mud dry weight carries out sludge conditioning, stirs 20-40s with 250-350rpm; In above-mentioned mud, continue to add the iron chloride of 115.07-138.09g/kg mud dry weight again, stir 2-4min with 40-60rpm; Then the mud after conditioning is filtered dehydration.
3. as claimed in claim 1 method, it is characterised in that described powdered rice hulls takes from common grain processing plant's rice husk, is milled into powdered rice hulls after drying, powdered rice hulls be sized to 109-150 ��m.
4. the method as described in claim 1��2 any claim, it is characterised in that described mud is the excess sludge of municipal sewage plant.
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| CN105502884B (en) * | 2015-12-07 | 2018-07-13 | 章亮庄 | A kind of mud dewatering method of high efficiency, low cost |
| CN110066096A (en) * | 2019-03-06 | 2019-07-30 | 哈尔滨工业大学 | Improve the method for dehydration property and settleability |
| CN110642494B (en) * | 2019-09-30 | 2022-06-24 | 齐鲁工业大学 | Application of biomass ash as framework construction body in sludge dewatering and method for improving dewatering performance of papermaking excess sludge |
| CN111423057A (en) * | 2020-04-03 | 2020-07-17 | 关向辉 | System and method for resourceful treatment and utilization of kitchen waste |
| CN113149694A (en) * | 2021-06-09 | 2021-07-23 | 广东绿友环保科技有限公司 | Method for preparing high-strength ceramic tile from activated sludge |
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| EP0587045A2 (en) * | 1992-09-11 | 1994-03-16 | BASF Aktiengesellschaft | Method for the utilization of waste plastics |
| CN101597532A (en) * | 2009-07-09 | 2009-12-09 | 余国贤 | A kind of sludge fuel and preparation method thereof |
| CN103449688A (en) * | 2012-05-28 | 2013-12-18 | 苏州科羽电子技术服务有限公司 | Sludge processing method |
| CN103553293A (en) * | 2013-11-07 | 2014-02-05 | 上海环保工程成套有限公司 | Deep dehydration method for solidifying fresh sludge through landfill stabilized sludge incineration residue |
| CN103880267A (en) * | 2014-02-27 | 2014-06-25 | 同济大学 | Method for treating fresh flocculent sludge by using landfill sludge incineration residues |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0587045A2 (en) * | 1992-09-11 | 1994-03-16 | BASF Aktiengesellschaft | Method for the utilization of waste plastics |
| CN101597532A (en) * | 2009-07-09 | 2009-12-09 | 余国贤 | A kind of sludge fuel and preparation method thereof |
| CN103449688A (en) * | 2012-05-28 | 2013-12-18 | 苏州科羽电子技术服务有限公司 | Sludge processing method |
| CN103553293A (en) * | 2013-11-07 | 2014-02-05 | 上海环保工程成套有限公司 | Deep dehydration method for solidifying fresh sludge through landfill stabilized sludge incineration residue |
| CN103880267A (en) * | 2014-02-27 | 2014-06-25 | 同济大学 | Method for treating fresh flocculent sludge by using landfill sludge incineration residues |
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