CN107129054B - Method suitable for intermittent operation of biological activated carbon filter - Google Patents
Method suitable for intermittent operation of biological activated carbon filter Download PDFInfo
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- CN107129054B CN107129054B CN201710491550.1A CN201710491550A CN107129054B CN 107129054 B CN107129054 B CN 107129054B CN 201710491550 A CN201710491550 A CN 201710491550A CN 107129054 B CN107129054 B CN 107129054B
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
- C02F2003/003—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms using activated carbon or the like
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Abstract
The invention discloses a method suitable for intermittent operation of a biological activated carbon filter, which comprises the following steps: s1, when the biological activated carbon filter stops operating, controlling the height of the water level in the carbon filter to submerge the activated carbon in the carbon filter, and changing water for the carbon filter at intervals until the biological activated carbon filter operates again; s2, performing backwashing on the biological activated carbon filter before the biological activated carbon filter operates again; s3, after the backwashing is finished, opening a water inlet and outlet valve and an ozone generator until the DOC and DON removal rate reaches the level of normal operation; s4, adjusting the inflow and ozone adding amount to the size of the normal operation, and starting the operation of the biological activated carbon filter. The invention effectively shortens the restart time of the biological activated carbon filter, thereby being capable of being put into production rapidly, remarkably improving the production process of a water plant, reducing the generation cost of the water plant, saving resources and energy sources, and having strong practicability and wide applicability.
Description
Technical Field
The invention relates to an operation method, in particular to a method suitable for intermittent operation of a biological activated carbon filter.
Background
The ozone-biological activated carbon process is characterized in that two operation units, namely an ozone contact column and an activated carbon filter, are added on the basis of the conventional water treatment process.
The process combines three technologies of ozone chemical oxidation, activated carbon physical and chemical adsorption and biodegradation into a whole by adopting a method of combining ozone oxidation and a biological activated carbon filter, can effectively remove pollutants in water and improve the quality of effluent, and is widely applied to domestic water plants.
For some drinking water sources, there may be a phenomenon of seasonal sudden pollution. When the phenomenon occurs, the raw water can reach the standard after being subjected to ozone-biological activated carbon advanced treatment, and the effluent can reach the standard after being treated by the conventional process within the time except the advanced treatment. In addition, the ozone-biological activated carbon process is costly to operate. Therefore, in order to solve the problem, the biological activated carbon filter in the water plant is operated intermittently to reduce the production cost of the water plant. However, during the stop of the operation, microorganisms on the activated carbon are seriously damaged, so that the biological activated carbon filter tank needs a longer time to recover the removal efficiency when being restarted, and the actual production process of the water works is delayed.
The method aims at the conservation method of the biological activated carbon filter in the intermittent period and the research on the operation parameters during the restarting is less, at present, the tap water plant is guided by experience in the actual production process, and the normal operation can be recovered in about 5-15 days during the restarting.
Therefore, the need exists for a more efficient method of operating a biological activated carbon filter in intermittent operation.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a method suitable for intermittent operation of a biological activated carbon filter.
In order to achieve the above object, the present invention adopts the following technical solutions:
a method suitable for intermittent operation of a biological activated carbon filter comprises the following steps:
s1, when the biological activated carbon filter stops operating, controlling the height of the water level in the carbon filter to submerge the activated carbon in the carbon filter, and changing water for the carbon filter at intervals until the biological activated carbon filter operates again;
s2, performing backwashing on the biological activated carbon filter before the biological activated carbon filter operates again;
s3, after the backwashing is finished, opening a water inlet and outlet valve and an ozone generator until the DOC and DON removal rate reaches the level of normal operation;
s4, adjusting the inflow and ozone adding amount to the size of the normal operation, and starting the operation of the biological activated carbon filter.
In the step S1, the water level exceeds the uppermost layer of active carbon in the carbon tank by 0.5-1.0 m.
The water changing method in the step S1 is to drain water and then feed water, and the water changing period is 6-10 days.
The backwashing method in the step S2 includes: firstly, flushing with air, then flushing with air and water simultaneously, and finally flushing with water; the strength of air impact is 5-10L/(m 2. s), and the air impact time is 3-5 min; the water flushing strength is 10-15L/(m 2. s), and the water flushing time is 5-10 min; when air and water are flushed simultaneously, the air flushing strength is 5-10L/(m 2. s), the water flushing strength is 8-12L/(m 2. s), and the time is 2-5 min.
The dosage of the ozone in the step S3 is 1.5-2.5 times of the dosage of the ozone when the biological activated carbon filter operates normally.
And in the step S3, the inflow rate of the water is 1.5-2.0 times of the flow rate of the biological activated carbon filter during normal operation.
The duration of the step S3 is 2-8 h.
The invention has the advantages that:
the method for intermittently operating the biological activated carbon filter tank adopts a method of periodically changing water to store the biological activated carbon filter tank which stops operating, thereby not only reducing the number of microorganisms attached to the activated carbon and the loss of activity, but also reducing the operating cost of a water works and avoiding unnecessary loss. The mode of firstly draining and then feeding water is adopted, so that the water quality environment in the activated carbon filter can be thoroughly improved, and the method is beneficial to the growth of microorganisms.
When the biological activated carbon filter is restarted, firstly independent air blasting is carried out on the biological activated carbon filter, then air and water are used for backwashing simultaneously, finally independent water blasting is carried out, the pollutants intercepted in the carbon bed can be effectively removed, and compared with the independent air blasting and air and water combined flushing, the water blasting time is prolonged, so that the activated carbon broken particles generated by the powerful shearing action of the air blasting are better discharged out of the carbon filter, and the influence on the water quality in the biological activated carbon filter is reduced.
Increase inflow and ozone and throw the volume, can improve the water biodegradability in the carbon pond and increase the oxygen content to make more macromolecular substance in the water become the micro molecule material, be of value to the absorption and the degradation of microorganism, provide suitable environment of carrying out the metabolism for the microorganism, effectively promote its fast growth and resume biological activity.
The invention provides a specific operation method suitable for intermittent operation of a biological activated carbon filter, which can provide technical guidance for actual production and avoid adverse consequences generated when experience is taken as guidance. The original normal operation recovery period is greatly shortened, so that the method can be put into production quickly, the production process of the water works is obviously improved, the generation cost of the water works is reduced, the resource and energy are saved, and the method has strong practicability and wide applicability.
Drawings
FIG. 1 is a graph showing the DOC removal rate during the recovery operation and the DOC removal rate during the normal operation of the biological activated carbon filter of the present invention.
FIG. 2 is a graph showing the DON removal rate during the recovery operation of the biological activated carbon filter according to the present invention, compared with the DON removal rate during the normal operation.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
A method suitable for intermittent operation of a biological activated carbon filter comprises the following steps:
s1, when the biological activated carbon filter stops operating, controlling the height of the water level in the carbon filter to submerge the activated carbon in the carbon filter by 0.5-1.0 m, and draining water in the carbon filter every 6-10 days and then feeding water until the biological activated carbon filter operates again;
s2, performing backwashing on the biological activated carbon filter before the biological activated carbon filter operates again; firstly, carrying out air blasting, wherein the air blasting strength is 5-10L/(m 2. s), and the air blasting time is 3-5 min; simultaneously flushing with air and water, wherein the air flushing strength is 5-10L/(m 2. s), the water flushing strength is 8-12L/(m 2. s), and the time is 2-5 min; finally, water flushing is carried out, wherein the water flushing strength is 10-15L/(m 2. s), and the water flushing time is 5-10 min;
s3, after the back washing is finished, opening a water inlet and outlet valve and an ozone generator, wherein the water inlet flow is 1.5-2.0 times of the flow of the biological activated carbon filter during normal operation, and the ozone adding amount is 1.5-2.5 times of the adding amount of the biological activated carbon filter during normal operation until the DOC and DON removal rate reaches the level during normal operation; the duration is 2-8 h.
S4, adjusting the inflow and ozone adding amount to the size of the normal operation, and starting the operation of the biological activated carbon filter.
In the embodiment, two sets of ozone-biological activated carbon process pilot-scale systems which run in parallel are adopted, and the inlet water is the water after sand filtration in a certain water plant.
One group of biological activated carbon columns is normal according to the operation parameters of a water plant, the other group stops operating, the biological activated carbon columns are stored by periodically changing water, the water changing period is 8d, the total storage time is 24d, the water level of the carbon pool exceeds 0.7m of the uppermost layer of activated carbon in the carbon pool, and water is drained before water is filled; after 24d, performing back flushing on the carbon tank by adopting a mode of firstly performing independent air flushing, then performing air-water combined flushing and finally performing independent water flushing; the strength of the single air impact is 8L/(m)2S), the air blast time is 4 min; gas-waterAt the same time, the air impact strength is 7L/(m) during back flushing2S), water impact strength 10L/(m)2S), time 4 min; the water flush intensity of the single water is 12L/(m)2S), the water flushing time is 8 min; after the back washing is finished, the adding amount of the ozone is adjusted to be 2.0 times of the adding amount of the biological activated carbon filter when the biological activated carbon filter operates normally, and the inflow rate is adjusted to be 1.8 times of the inflow rate of the biological activated carbon filter when the biological activated carbon filter operates normally.
Keeping the state and running for 12h, and detecting the change condition of the DOC and DON removal efficiency of the two groups of ozone-biological activated carbon processes.
The DOC and DON removal rate of the ozone biological activated carbon process during the whole re-operation period and the removal efficiency comparison effect in the normal operation are shown in figures 1 and 2.
As can be seen from the figures 1 and 2, the biological activated carbon filter tank which is put into operation again returns to normal operation, the DOC and DON removal rate is about 4 hours, the original normal operation recovery period of 4-5 days is greatly shortened, and the production process of the water works is obviously improved.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (5)
1. A method suitable for intermittent operation of a biological activated carbon filter is characterized by comprising the following steps:
s1, when the biological activated carbon filter stops operating, controlling the height of the water level in the carbon filter to submerge the activated carbon in the carbon filter, and changing water for the carbon filter at intervals until the biological activated carbon filter operates again; the water changing method in the step S1 is to drain water and then feed water, wherein the water changing period is 6-10 days;
s2, performing backwashing on the biological activated carbon filter before the biological activated carbon filter operates again;
s3, after the backwashing is finished, opening a water inlet and outlet valve and an ozone generator until the DOC and DON removal rate reaches the level of normal operation;
s4, adjusting the inflow and ozone adding amount to the size of the normal operation, and starting the operation of the biological activated carbon filter;
the backwashing method in the step S2 comprises the following steps: firstly, flushing with air, then flushing with air and water simultaneously, and finally flushing with water; the strength of air impact is 5-10L/(m)2S), the air impact time is 3-5 min; the water impact strength is 10-15L/(m)2S), the water flushing time is 5-10 min; when air and water are simultaneously flushed, the air flushing strength is 5-10L/(m)2S) and water impact strength of 8-12L/(m)2S) for 2-5 min.
2. The method of claim 1, wherein the water level in step S1 exceeds the uppermost activated carbon layer in the carbon pool by 0.5-1.0 m.
3. The method of claim 1, wherein the amount of ozone added in step S3 is 1.5-2.5 times of the amount of ozone added in normal operation of the biological activated carbon filter.
4. The method of claim 1, wherein the inflow rate of water in the step S3 is 1.5-2.0 times of the flow rate of the biological activated carbon filter during normal operation.
5. The method for intermittently operating the biological activated carbon filter tank as recited in claim 1, wherein the duration of the step S3 is 2-8 h.
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| CN107487942A (en) * | 2017-09-08 | 2017-12-19 | 河海大学 | A kind of drinking water purifying device and method of while organics removal and ammonia nitrogen |
| CN108226400A (en) * | 2018-01-24 | 2018-06-29 | 上海华严检测技术有限公司 | A kind of biological activated carbon filter runs appraisal procedure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0394892A (en) * | 1989-09-06 | 1991-04-19 | Toshiba Corp | Bioactive carbon filtering device |
| WO2004002904A1 (en) * | 2002-06-28 | 2004-01-08 | Kingsford Environmental (H.K.) Ltd. | Combined activated sludge-biofilm sequencing batch reactor and process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2396312B (en) * | 2002-12-17 | 2006-07-05 | Sev Trent Water Purification L | Biological aerated filter |
| CN101985375B (en) * | 2010-08-02 | 2012-02-15 | 朱向宏 | High-efficiency washing method and device for filter adopting expansive filler |
| CN102295394B (en) * | 2011-08-22 | 2013-01-02 | 大连海洋大学 | Culture method of microbial film in biological-filtering pool for lobworm |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0394892A (en) * | 1989-09-06 | 1991-04-19 | Toshiba Corp | Bioactive carbon filtering device |
| WO2004002904A1 (en) * | 2002-06-28 | 2004-01-08 | Kingsford Environmental (H.K.) Ltd. | Combined activated sludge-biofilm sequencing batch reactor and process |
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