CN104801271A - Method for preparing modified rice hull biochar and conditioning urban sludge through modified rice hull biochar - Google Patents
Method for preparing modified rice hull biochar and conditioning urban sludge through modified rice hull biochar Download PDFInfo
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- CN104801271A CN104801271A CN201510173496.7A CN201510173496A CN104801271A CN 104801271 A CN104801271 A CN 104801271A CN 201510173496 A CN201510173496 A CN 201510173496A CN 104801271 A CN104801271 A CN 104801271A
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- rice husk
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Abstract
The invention discloses a method for preparing modified rice hull biochar and conditioning urban sludge through modified rice hull biochar and belongs to the technical field of environmental management. The method comprises steps as follows: the rice hull biochar is prepared under certain conditions; the rice hull biochar is immersed in a hydrochloric acid solution in a certain ratio; the rice hull biochar after acid pickling is modified with a ferric chloride solution under certain conditions, and the modified rice hull biochar is prepared; the prepared rice hull biochar is used for conditioning the sludge to improve the dewatering property of the sludge. The modified rice hull biochar can effectively improve the dewatering property of the sludge, and the water content of dewatered sludge filter cakes is up to 68%-71%; meanwhile, the raw material of the rice hull biochar is taken as agriculture waste rice hull; the method has a great significance in solving the environmental pollution and promoting recycling of wastes.
Description
Technical field
The invention belongs to technical field of environmental management, particularly a kind of method of modification rice husk biological carbon preparation and conditioning municipal sludge thereof.
Background technology
Municipal sludge is because output is large, volume is large, character is complicated and there is harm to environment and human health, if dealt with improperly, may produce secondary pollution, therefore arduous task is disposed in the process of mud.Municipal sludge contains large quantity of moisture (more than 97%), bulky, disposes bring extreme difficulties for subsequent treatment, and therefore effectively dehydration is the key of specific resistance to filtration.But municipal sludge is as a kind of high-ductility fluid, and after Direct Dehydration, moisture percentage in sewage sludge is still more than 90%; Need through sludge conditioning, improve its dewatering.
At present, sludge conditioning technique can be divided into Physical, chemical method and bioanalysis three major types substantially.Wherein chemical conditioning method because of easy and simple to handle, treatment cycle is short, investment advantages such as operating cost is low and being used widely.But because the mud after chemical conditioning has higher compressibility, in filter process, sludge filter cake becomes more and more tightr, thus hinders the raising of sludge dewatering efficiency.In order to reduce the compressibility of mud, develop the focus that various new and effective, safe, economic sludge conditioner becomes sludge dewatering research.Chen Changya etc. adopt modified coal ash to nurse one's health municipal sludge, and result shows that modified coal ash effectively can improve the dewatering of mud, but the dosage that modified coal ash adds separately is comparatively large, may increase the total solid of mud; Luo Haijian etc. have studied the impact of wood chip on sludge conditioning, and result shows wood chip and PAMC co-conditioning municipal sludge, effectively can improve the dewatering of mud, but add separately wood chip sludge dewatering poor effect.Research shows that adding separately a small amount of physics conditioner is conducive to forming the mud easily dewatered, but significantly do not act on raising dewatering performance of sludge, the method that the many employings of existing method add a large amount of physics conditioning agent or coupling chemical floc improves dewatering performance of sludge.The large dosage of physics conditioner, can increase the total solids content of sludge cake greatly, is unfavorable for that the later stage of mud is disposed; Physics conditioner and flocculant coupling, method is complicated, is difficult to the best of breed dosage finding conditioner.
Research shows, biological carbon can be used to the heavy metal in absorption soil and improves water quality, but there is no the research utilizing rice husk biological carbon to improve dewatering performance of sludge at present.Rice husk biological carbon surface is with negative electrical charge, after independent interpolation rice husk biological carbon, effectively can not produce electrostatic neutralization with electronegative mud granule, skeleton function for de-not steady raw sewage rice husk biological carbon is not obvious, adds separately the dewatering that rice husk biological carbon effectively can not improve mud.Therefore, need to carry out modification to rice husk biological carbon.This patent adopts iron chloride to carry out modification to rice husk biological carbon, and adopts this rice husk biological carbon to nurse one's health municipal sludge, effectively can improve the dewatering of mud.The problem that the method both can avoid physics conditioner dosage excessive, also complicated procedures of forming when physics conditioner and chemical floc coupling can be avoided, that a kind of technique is simple, inexpensive, respond well sludge conditioning new method, the modification rice husk biological carbon that the preparation method of property rice husk biological carbon obtains, simultaneously for the recycling of rice husk biological carbon provides another new outlet, has the benefit of higher economy, society and environment.
Summary of the invention
The object of the invention is to, overcome the deficiency of existing sludge conditioning and dehydration technique, the modification rice husk biological carbon preparation providing a kind of technique simple, with low cost, respond well and the method for conditioning municipal sludge thereof.
The preparation method of a kind of modification rice husk biological carbon provided by the invention, described sludge conditioner adopts iron chloride modification preparation, comprises the following steps:
(1) get a certain amount of rice husk under limited oxygen condition, burn 1-3h with 450-550 DEG C;
(2) mill after the residual solids after burning being cooled naturally and sieve, obtain the rice husk biological carbon that size is 80-250 μm;
(3) be immersed in the hydrochloric acid solution of 0.5-1.5mol/L by rice husk biological carbon, the ratio of rice husk biological carbon quality and hydrochloric acid solution volume is 1:55-1:45g/ml, and soak time is 20-26h;
(4) be immersed in rice husk biological carbon in hydrochloric acid filter above-mentioned, and with pure water rinsing repeatedly, until filtrate pH is in neutral, dry at 100-120 DEG C;
(5) the rice husk biological carbon powder after above-mentioned oven dry is put into 2-4mol/L ferric chloride solution, the ratio of rice husk biological carbon quality and ferric chloride solution volume is 1:12-1:8g/ml, carry out ultrasonic disperse and mixing, ultrasonic power is 80-120W, water temperature is 20-40 DEG C, and ultrasonic time is 0.5-2h;
(6) by above-mentioned ultrasonic after rice husk biological carbon filter, dry at 100-120 DEG C, mill and sieve after cooling naturally, obtain the modification rice husk biological carbon that described size is 80-250 μm.
The method of modification rice husk biological carbon conditioning municipal sludge of the present invention, comprises the following steps:
Get a certain amount of mud, add the above-mentioned prepared modification rice husk biological carbon of 60%-80% mud dry weight, first rapid stirring 250-350rpm, time 20-40s, rear low rate mixing 40-60rpm, time 2-5min, then carry out filtering means dehydration.
Powdered rice hulls in described modification rice husk biological carbon preparation method, is specially the rice husk taking from common grain processing plant.
Mud in described modification rice husk biological carbon conditioning municipal sludge method, is specially the excess sludge of municipal sewage plant.
The invention has the advantages that, modification rice husk biological carbon of the present invention effectively can improve the dewatering of municipal sludge, its dehydrating effect will be far superior to former rice husk biological carbon, compared with raw sewage, sludge specific resistance decline 95.1%-98.0%, the clean productive rate of mud improves 24.3-28.1 doubly, and filter cake moisture content reaches 68%-71%.And the method does not need to add any flocculant again, method of operating is simple, practical, and for solution environmental pollution, to realize the treatment of wastes with processes of wastes against one another significant.
Accompanying drawing explanation
Fig. 1 is the microscopic pattern figure of modification rice husk biological carbon.
Detailed description of the invention:
Below by specific embodiment, the present invention is set forth further, but do not limit the present invention.
Ultrasonic equipment used in embodiments of the invention is ultrasonic washing instrument, model is KQ2200V, supersonic frequency is 40kHz, ultrasonic power is 100W, rice husk used takes from Changsha grain processing plant, and embodiment 2 and embodiment 3 mud used take from the excess sludge of Changsha second sewage treatment plant, and raw sewage moisture content is 98.9-99.5%, embodiment 4 mud used takes from the excess sludge of Changsha first sewage treatment plant, and raw sewage moisture content is 98.1-99.2%.
Embodiment 1:
(1) get a certain amount of rice husk under limited oxygen condition, burn 2h with 500 DEG C;
(2) mill after the residual solids after burning being cooled naturally and sieve, obtain the rice husk biological carbon that size is 80-250 μm;
(3) be immersed in the hydrochloric acid solution of 1mol/L by rice husk biological carbon, the ratio of rice husk biological carbon quality and hydrochloric acid solution volume is 1:50g/ml, and soak time is 24h;
(4) be immersed in rice husk biological carbon in hydrochloric acid filter above-mentioned, and with pure water rinsing repeatedly, until filtrate pH is in neutral, dry at 105 DEG C;
(5) the rice husk biological carbon powder after above-mentioned oven dry is put into 3mol/L ferric chloride solution, the ratio of rice husk biological carbon quality and ferric chloride solution volume is 1:10g/ml, carries out ultrasonic disperse and mixing, and ultrasonic power is 100W, water temperature is 30 DEG C, and ultrasonic time is 1h;
(6) by above-mentioned ultrasonic after rice husk biological carbon filter, dry at 100-120 DEG C, mill and sieve after cooling naturally, obtain the modification rice husk biological carbon that described size is 80-250 μm.
The modification rice husk biological carbon prepared by embodiment 1 carries out the sludge conditioning in following examples 2-4.
Embodiment 2: get a certain amount of mud, adds the modification rice husk biological carbon according to claim 1 of 60% mud dry weight, first rapid stirring 350rpm, time 30s, rear low rate mixing 40rpm, time 3min, then carries out filtering means dehydration.Acquired results is as follows: compared with raw sewage, and sludge specific resistance is by 51.30 × 10
12m/kg drops to 1.04 × 10
12m/kg, the clean productive rate of mud is by 0.63kg/ (m
2h) 18.33kg/ (m is risen to
2h), moisture content of the cake drops to 70.30% by original 90.01%.
Embodiment 3: get a certain amount of mud, adds the modification rice husk biological carbon according to claim 1 of 65% mud dry weight, first rapid stirring 350rpm, time 30s, rear low rate mixing 40rpm, time 3min, then carries out filtering means dehydration.Acquired results is as follows: compared with raw sewage, and sludge specific resistance is by 65.45 × 10
12m/kg drops to 2.18 × 10
12m/kg, the clean productive rate of mud is by 0.60kg/ (m
2h) 15.44kg/ (m is risen to
2h), moisture content of the cake drops to 70.93% by original 90.57%.
Embodiment 4: get a certain amount of mud, adds the modification rice husk biological carbon according to claim 1 of 70% mud dry weight, first rapid stirring 350rpm, time 30s, rear low rate mixing 40rpm, time 3min, then carries out filtering means dehydration.Acquired results is as follows: compared with raw sewage, and sludge specific resistance is by 20.61 × 10
12m/kg drops to 1.01 × 10
12m/kg, the clean productive rate of mud is by 0.77kg/ (m
2h) 20.27kg/ (m is risen to
2h), moisture content of the cake drops to 69.02% by original 89.97%.
Claims (4)
1. a preparation method for modification rice husk biological carbon, is characterized in that, described sludge conditioner adopts iron chloride modification preparation, comprises the following steps:
(1) get a certain amount of rice husk under limited oxygen condition, burn 1-3h with 450-550 DEG C;
(2) mill after the residual solids after burning being cooled naturally and sieve, obtain the rice husk biological carbon that size is 80-250 μm;
(3) be immersed in the hydrochloric acid solution of 0.5-1.5mol/L by rice husk biological carbon, the ratio of rice husk biological carbon quality and hydrochloric acid solution volume is 1:55-1:45g/ml, and soak time is 20-26h;
(4) be immersed in rice husk biological carbon in hydrochloric acid filter above-mentioned, and with pure water rinsing repeatedly, until filtrate pH is in neutral, dry at 100-120 DEG C;
(5) the rice husk biological carbon powder after above-mentioned oven dry is put into 2-4mol/L ferric chloride solution, the ratio of rice husk biological carbon quality and ferric chloride solution volume is 1:12-1:8g/ml, carry out ultrasonic disperse and mixing, ultrasonic power is 80-120W, water temperature is 20-40 DEG C, and ultrasonic time is 0.5-2h;
(6) by above-mentioned ultrasonic after rice husk biological carbon filter, dry at 100-120 DEG C, mill and sieve after cooling naturally, obtain the modification rice husk biological carbon that described size is 80-250 μm.
2. modification rice husk biological carbon nurses one's health the method for municipal sludge as claimed in claim 1, it is characterized in that, said method comprising the steps of: get a certain amount of mud, add the modification rice husk biological carbon according to claim 1 of 60%-80% mud dry weight, first rapid stirring 250-350rpm, time 20-40s, rear low rate mixing 40-60rpm, time 2-5min, then carry out filtering means dehydration.
3. method as claimed in claim 1, it is characterized in that, described rice husk takes from the rice husk of common grain processing plant.
4. method as claimed in claim 2, it is characterized in that, described mud is the excess sludge of municipal sewage plant.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254153A (en) * | 2015-11-23 | 2016-01-20 | 湖南大学 | Potassium permanganate lysis/ferric chloride flocculation/biological carbon skeleton combined conditioning method for municipal sludge |
| CN108690555A (en) * | 2018-06-06 | 2018-10-23 | 安徽华利达户外用品有限公司 | A kind of adhesive for making the fibre board use of outdoor furniture |
| CN108863016A (en) * | 2018-06-27 | 2018-11-23 | 昆明理工大学 | A kind of method of sludge dewatering |
| CN109020156A (en) * | 2018-08-27 | 2018-12-18 | 成都信息工程大学 | A method of improving sludge from wastewater treatment plant water separation capability |
| CN109626795A (en) * | 2019-01-18 | 2019-04-16 | 宝钢湛江钢铁有限公司 | A kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation |
| CN110066096A (en) * | 2019-03-06 | 2019-07-30 | 哈尔滨工业大学 | Improve the method for dehydration property and settleability |
| CN110217772A (en) * | 2019-05-13 | 2019-09-10 | 中山大学 | A kind of modification biological charcoal and its preparation method and application |
| CN113857231A (en) * | 2021-08-18 | 2021-12-31 | 广东工业大学 | Preparation of iron-based biochar wave-absorbing material and method for repairing mercury-contaminated soil through microwave synergy |
| CN115254025A (en) * | 2022-08-19 | 2022-11-01 | 常州大学 | Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using printing and dyeing sludge dehydrating agent |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254153A (en) * | 2015-11-23 | 2016-01-20 | 湖南大学 | Potassium permanganate lysis/ferric chloride flocculation/biological carbon skeleton combined conditioning method for municipal sludge |
| CN108690555A (en) * | 2018-06-06 | 2018-10-23 | 安徽华利达户外用品有限公司 | A kind of adhesive for making the fibre board use of outdoor furniture |
| CN108863016A (en) * | 2018-06-27 | 2018-11-23 | 昆明理工大学 | A kind of method of sludge dewatering |
| CN109020156A (en) * | 2018-08-27 | 2018-12-18 | 成都信息工程大学 | A method of improving sludge from wastewater treatment plant water separation capability |
| CN109626795A (en) * | 2019-01-18 | 2019-04-16 | 宝钢湛江钢铁有限公司 | A kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation |
| CN110066096A (en) * | 2019-03-06 | 2019-07-30 | 哈尔滨工业大学 | Improve the method for dehydration property and settleability |
| CN110217772A (en) * | 2019-05-13 | 2019-09-10 | 中山大学 | A kind of modification biological charcoal and its preparation method and application |
| CN113857231A (en) * | 2021-08-18 | 2021-12-31 | 广东工业大学 | Preparation of iron-based biochar wave-absorbing material and method for repairing mercury-contaminated soil through microwave synergy |
| CN115254025A (en) * | 2022-08-19 | 2022-11-01 | 常州大学 | Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using printing and dyeing sludge dehydrating agent |
| CN115254025B (en) * | 2022-08-19 | 2024-04-05 | 常州大学 | Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using same |
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Application publication date: 20150729 |