CN111186977A - Method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration - Google Patents
Method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration Download PDFInfo
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- CN111186977A CN111186977A CN202010061774.0A CN202010061774A CN111186977A CN 111186977 A CN111186977 A CN 111186977A CN 202010061774 A CN202010061774 A CN 202010061774A CN 111186977 A CN111186977 A CN 111186977A
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- sludge
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-pressure and low-pressure dehydration, which mainly comprises the steps of grinding the excess sludge by using a sand mill, destroying cell bodies to release intracellular water, oxidizing and destroying organic matters such as intracellular polymers with high water content by using the strong oxidizing property of a Fenton reagent, killing microorganisms at the same time to inactivate and stabilize the sludge, and finally performing low-pressure and high-pressure filter pressing by using a plate-and-frame filter press to realize high-efficiency dehydration of the sludge. The invention has the following advantages: the process is simple, the operation is convenient, the dehydration effect is good, the addition of solid medicament in the treatment process is less, the increment of sludge is avoided, and the subsequent further resource utilization is facilitated.
Description
Technical Field
The invention relates to the technical field of plate-and-frame filter presses, in particular to a method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration.
Background
A large amount of sludge is generated in the sewage treatment process, the water content of the sludge is high, the dehydration is difficult, and the subsequent treatment cost is high. The difficulty of sludge dehydration mainly lies in: 1. the superfine particles in the sludge have strong hydrophilicity and low permeability coefficient; 2. the organic matter in the sludge contains a large amount of adsorbed water and bound water; 3. the polyacrylamide added when the sewage treatment plant separates sludge has good water retention. Therefore, finding methods and techniques to reduce the water content of sludge is crucial to the treatment and disposal of sludge.
At present, the sludge treatment technology mainly comprises anaerobic digestion, aerobic fermentation, mechanical dehydration, heat drying, incineration and other modes, the anaerobic digestion reaction time is long, the operation is easily influenced by environmental conditions, and the investment is large; the aerobic fermentation reaction time is long, and the occupied area is large; the heat drying energy consumption is large, toxic and harmful gases are easily generated by burning, the requirements on the water content and the organic matter content of the sludge are high, the occupied area of conventional mechanical dehydration is small, the investment is small, but a large amount of chemical agents such as lime and the like need to be added, so that the solid content of the sludge is increased, the dehydration effect is general, and the subsequent resource utilization is influenced.
Disclosure of Invention
The invention provides a method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration aiming at the problems of the existing sludge dehydration, which mainly comprises the steps of diluting the sludge with about 80 percent of water content in a sewage treatment plant, grinding the slurry by using a sand mill, destroying cell bodies, releasing intracellular water, oxidizing and destroying organic matters such as intracellular polymers with high water content by using the strong oxidizing property of a Fenton reagent, killing microorganisms simultaneously, inactivating and stabilizing the sludge, and finally performing high-low pressure filter pressing by using a plate-and-frame filter press to realize the high-efficiency dehydration of the sludge.
In order to achieve the technical features, the invention is realized as follows: the method for treating the excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration comprises the following steps:
step one, diluting sludge slurry:
diluting the sludge to be treated, and enabling the sludge to have good fluidity so as to meet the feeding requirement of a sand mill;
step two, treating excess sludge by mechanical wall breaking:
pumping diluted sludge slurry into a sand mill through a pump for grinding, so that the cell wall of the sludge is broken, and intracellular water is released;
step three, treating excess sludge by Fenton reaction:
collecting the ground slurry, adding acid to adjust the pH value, adding ferrous sulfate and hydrogen peroxide, stirring, and reacting for a period of time;
step four, performing high-low pressure dehydration treatment on excess sludge:
and (3) feeding the slurry after the reaction into a high-pressure plate-and-frame filter press for dehydration, so as to realize the reduction and harmless treatment of the sludge.
In the first step, the treated sludge is sludge which is mechanically dewatered in a sewage treatment plant and contains 80% of water, and water is required to be added for diluting the sludge to suspended slurry with the solid content of 10%, so that the fluidity of the slurry is ensured.
In the second step, the grain size of the treated sludge is between 20 and 50um, and the grain size of the treated sludge is between 5 and 10um after feeding and grinding; the cells are disrupted by mechanical abrasion, thereby releasing intracellular water from the cells.
The specific operation of the third step is that the sludge slurry after the mechanical wall breaking treatment by the sand mill is firstly added with hydrochloric acid to adjust the pH value to 3-5, then added with 10-20% of ferrous sulfate to react for 10min, added with 10-20% of hydrogen peroxide to stir and react for 30min, and the high water content intracellular polymeric organic matters in the cells are oxidized through the strong oxidizing property of Fenton, and simultaneously, microorganisms are killed to stabilize the sludge.
And the specific operation of the fourth step is that the sludge is dewatered by a high-pressure plate-and-frame filter press, low-pressure feeding is firstly adopted, the pressure is controlled to be below 0.8Mpa, the feeding is carried out for 20 min, then the feeding is carried out by a high-pressure pump, the pressure is not more than 1.2Mpa, the feeding is carried out for 10min, and after the feeding is finished, secondary squeezing is carried out for about 5 min by using the water pressure not more than 1.6Mpa, so that the sludge dewatering can be finished.
The invention has the following beneficial effects:
1. the treatment method has the advantages of simple flow, convenient operation, good dehydration effect, less solid medicament added in the treatment process, avoiding sludge increment and being beneficial to subsequent further resource utilization.
Detailed Description
Embodiments of the present invention will be further described below.
Example 1:
step one, diluting sludge slurry:
diluting the sludge to be treated, and enabling the sludge to have good fluidity so as to meet the feeding requirement of a sand mill; the treated sludge is sludge which is mechanically dewatered in a sewage treatment plant and contains 80% of water, and the treated sludge needs to be diluted by adding water until the solid content is 10%, so that the fluidity of the sludge is ensured.
Step two, treating excess sludge by mechanical wall breaking:
pumping diluted sludge slurry into a sand mill through a pump for grinding, so that the cell wall of the sludge is broken, and intracellular water is released; the grain diameter of the treated sludge is between 20 and 50um, and the grain diameter of the treated sludge is between 5 and 10um after feeding and grinding; the cells are disrupted by mechanical abrasion, thereby releasing intracellular water from the cells.
Step three, treating excess sludge by Fenton reaction:
collecting the ground slurry, adding acid to adjust the pH value, adding ferrous sulfate and hydrogen peroxide, stirring, and reacting for a period of time; adding hydrochloric acid into sludge slurry subjected to mechanical wall breaking treatment by a sand mill to adjust the pH value to 3-5, adding 10-20% of ferrous sulfate, reacting for 10min, adding 10-20% of hydrogen peroxide, stirring and reacting for 30min, oxidizing high water content intracellular polymeric organic matters in cells through the strong oxidizing property of Fenton, and killing microorganisms to stabilize the sludge.
Step four, performing high-low pressure dehydration treatment on excess sludge:
and (2) feeding the slurry after the reaction is finished into a high-pressure plate-and-frame filter press for dehydration to realize reduction and harmless treatment of the sludge, wherein the sludge is dehydrated through the high-pressure plate-and-frame filter press, low-pressure feeding is firstly adopted, the pressure is controlled below 0.8Mpa, the feeding is carried out for 20 min, the feeding is carried out through a high-pressure pump, the pressure is not more than 1.2Mpa, the feeding is carried out for 10min, and after the feeding is finished, secondary squeezing is carried out for about 5 min by using the water pressure not more than 1..
Example 2:
the method for treating the excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration comprises the following steps:
the method comprises the following steps: 60kg of dewatered sludge containing 80% of water in a sewage treatment plant is taken and diluted to about 90% of water by adding water.
Step two: and (3) sucking the diluted sludge pump into a sand mill, adjusting the feeding flow, circularly grinding until the particle size of the sludge is 5-10um, and discharging the ground sludge for later use.
Step three: adding hydrochloric acid into the sludge slurry subjected to the mechanical wall breaking treatment by the sand mill to adjust the pH value of the sludge slurry to 3-5, adding 10% of ferrous sulfate (calculated by the amount of dry sludge), stirring for reaction for 10min, adding 15% of hydrogen peroxide, and stirring for reaction for 30 min.
Step four: the method comprises the steps of carrying out combined treatment on excess sludge through mechanical wall breaking and Fenton reaction, feeding for about 20 min at low pressure of below 0.8Mpa, feeding for about 10min at pressure of not more than 1.2Mpa through a high-pressure pump, and carrying out secondary squeezing for about 5 min by using water pressure of not more than 1.6Mpa after feeding is finished, so that sludge dewatering can be finished.
Step five: and detecting that the water content of the dewatered sludge is 55%.
Example 3:
the method for treating the excess sludge by plate-and-frame filter pressing by adding lime comprises the following steps:
the method comprises the following steps: 60kg of dewatered sludge containing 80% of water in a sewage treatment plant is taken and diluted to about 95% of water by adding water.
Step two: and adding lime and ferric chloride into the diluted sludge slurry for conditioning, wherein the addition amount of the lime is about 20%, the addition amount of the ferric chloride is 6% (calculated on dry sludge), and the conditioning time is 30 min.
Step three: the sludge slurry after lime conditioning is fed at low pressure, the pressure is controlled below 0.8MPa, the feeding is carried out for about 60min, then the sludge slurry is fed through a high-pressure pump, the pressure is not more than 1.2MPa, the feeding is carried out for about 30min, and after the feeding is finished, secondary squeezing is carried out for about 15 min by using the water pressure not more than 1.6MPa, so that the dehydration can be finished.
Step four: and detecting that the water content of the dewatered sludge is 65%.
Compared with a method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration and a method for treating excess sludge by adding lime and performing plate-and-frame filter pressing, the method has the advantages that the dehydration time of the excess sludge after mechanical wall breaking, Fenton reaction and high-low pressure dehydration is shorter, the dehydration effect is better, and the material addition is relatively less.
Claims (5)
1. The method for treating the excess sludge by combining mechanical wall breaking, Fenton reaction and high-pressure and low-pressure dehydration is characterized by comprising the following steps of:
step one, diluting sludge slurry:
diluting the sludge to be treated, and enabling the sludge to have good fluidity so as to meet the feeding requirement of a sand mill;
step two, treating excess sludge by mechanical wall breaking:
pumping diluted sludge slurry into a sand mill through a pump for grinding, so that the cell wall of the sludge is broken, and intracellular water is released;
step three, treating excess sludge by Fenton reaction:
collecting the ground slurry, adding acid to adjust the pH value, adding ferrous sulfate and hydrogen peroxide, stirring, and reacting for a period of time;
step four, performing high-low pressure dehydration treatment on excess sludge:
and (3) feeding the slurry after the reaction into a high-pressure plate-and-frame filter press for dehydration, so as to realize the reduction and harmless treatment of the sludge.
2. The method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-pressure and low-pressure dehydration according to claim 1, which is characterized in that: in the first step, the treated sludge is sludge which is mechanically dewatered in a sewage treatment plant and contains 80% of water, and water is required to be added for diluting the sludge to suspended slurry with the solid content of 10%, so that the fluidity of the slurry is ensured.
3. The method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-pressure and low-pressure dehydration according to claim 1, which is characterized in that: in the second step, the grain size of the treated sludge is between 20 and 50um, and the grain size of the treated sludge is between 5 and 10um after feeding and grinding; the cells are disrupted by mechanical abrasion, thereby releasing intracellular water from the cells.
4. The method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-pressure and low-pressure dehydration according to claim 1, which is characterized in that: the specific operation of the third step is that the sludge slurry after the mechanical wall breaking treatment by the sand mill is firstly added with hydrochloric acid to adjust the pH value to 3-5, then added with 10-20% of ferrous sulfate to react for 10min, added with 10-20% of hydrogen peroxide to stir and react for 30min, and the high water content intracellular polymeric organic matters in the cells are oxidized through the strong oxidizing property of Fenton, and simultaneously, microorganisms are killed to stabilize the sludge.
5. The method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-pressure and low-pressure dehydration according to claim 1, which is characterized in that: and the specific operation of the fourth step is that the sludge is dewatered by a high-pressure plate-and-frame filter press, low-pressure feeding is firstly adopted, the pressure is controlled to be below 0.8Mpa, the feeding is carried out for 20 min, then the feeding is carried out by a high-pressure pump, the pressure is not more than 1.2Mpa, the feeding is carried out for 10min, and after the feeding is finished, secondary squeezing is carried out for about 5 min by using the water pressure not more than 1.6Mpa, so that the sludge dewatering can be finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010061774.0A CN111186977A (en) | 2020-01-19 | 2020-01-19 | Method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010061774.0A CN111186977A (en) | 2020-01-19 | 2020-01-19 | Method for treating excess sludge by combining mechanical wall breaking, Fenton reaction and high-low pressure dehydration |
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| CN111186977A true CN111186977A (en) | 2020-05-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624545A (en) * | 2020-12-22 | 2021-04-09 | 湖南军信环保股份有限公司 | Treatment method and treatment system for anaerobic digestion sludge |
| CN113024064A (en) * | 2021-03-17 | 2021-06-25 | 深圳市星河环境技术有限公司 | Simple, convenient and efficient harmless treatment process for phosphorus-poor combustible sludge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205347161U (en) * | 2016-01-07 | 2016-06-29 | 浙江荣晟环保纸业股份有限公司 | Comprehensive processing apparatus of biochemical mud of papermaking |
| CN106630524A (en) * | 2016-11-07 | 2017-05-10 | 浙江欧可美科技股份有限公司 | Method for improving dewatering performance of excess sludge |
| CN106746407A (en) * | 2016-12-28 | 2017-05-31 | 山东益源环保科技有限公司 | A kind of technique for improving excess sludge dewatering |
| CN106746200A (en) * | 2016-12-14 | 2017-05-31 | 广东科达洁能股份有限公司 | A kind of city sewage deep treatment system |
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2020
- 2020-01-19 CN CN202010061774.0A patent/CN111186977A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205347161U (en) * | 2016-01-07 | 2016-06-29 | 浙江荣晟环保纸业股份有限公司 | Comprehensive processing apparatus of biochemical mud of papermaking |
| CN106630524A (en) * | 2016-11-07 | 2017-05-10 | 浙江欧可美科技股份有限公司 | Method for improving dewatering performance of excess sludge |
| CN106746200A (en) * | 2016-12-14 | 2017-05-31 | 广东科达洁能股份有限公司 | A kind of city sewage deep treatment system |
| CN106746407A (en) * | 2016-12-28 | 2017-05-31 | 山东益源环保科技有限公司 | A kind of technique for improving excess sludge dewatering |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624545A (en) * | 2020-12-22 | 2021-04-09 | 湖南军信环保股份有限公司 | Treatment method and treatment system for anaerobic digestion sludge |
| CN113024064A (en) * | 2021-03-17 | 2021-06-25 | 深圳市星河环境技术有限公司 | Simple, convenient and efficient harmless treatment process for phosphorus-poor combustible sludge |
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Application publication date: 20200522 |