CN110627200B - Backwashing method for reinforced aeration biological filter - Google Patents

Backwashing method for reinforced aeration biological filter Download PDF

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Publication number
CN110627200B
CN110627200B CN201810659765.4A CN201810659765A CN110627200B CN 110627200 B CN110627200 B CN 110627200B CN 201810659765 A CN201810659765 A CN 201810659765A CN 110627200 B CN110627200 B CN 110627200B
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filter
biological aerated
liquid level
aerated filter
washing
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CN110627200A (en
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蒲文鹏
安平林
王冠平
牛涛
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Everbright Water Shenzhen Co ltd
Jiangsu Tongyong Environment Engineering Co ltd
Everbright Water Technology Development Nanjing Co ltd
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Everbright Water Shenzhen Co ltd
Jiangsu Tongyong Environment Engineering Co ltd
Everbright Water Technology Development Nanjing Co ltd
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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
    • C02F3/02—Aerobic processes
    • 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
    • C02F2303/14—Maintenance of water treatment installations
    • 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
    • C02F2303/16—Regeneration of sorbents, filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention provides a backwashing method for a reinforced aeration biological filter, which comprises the following steps: closing control valves of a nitrification liquid return pipe and a water inlet lifting pipe, opening a vent pipe control valve, reducing the liquid level of the biological aerated filter, reducing the liquid level to 8-15% of the height of a filter material of the biological aerated filter, and closing the vent pipe control valve after the liquid level is maintained for more than or equal to 110 s; opening a back flushing air valve, and performing back flushing air washing for 10 min; opening a back flushing water valve, and performing back flushing water washing for 10 min; and (5) closing the back flush air valve and washing for 10 min.

Description

Backwashing method for reinforced aeration biological filter
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a backwashing method for a reinforced aeration biological filter.
Background
The aeration biological filter tank is a novel device integrating biological oxidation and suspended solid interception, and suspended matters (SS), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), nitrification, denitrification, dephosphorization, AOX (hazardous substances) and the like in sewage can be removed through the aeration biological filter tank. The biological aerated filter can better purify sewage, but simultaneously, the filtered waste is easy to cause the blockage of the filter material of the biological aerated filter. Therefore, the backwashing of the biological aerated filter is important for the normal operation of the biological aerated filter, SS intercepted on a filter material of the biological aerated filter and microbial membranes excessively grown and aged on the filter material can be cleaned in time through backwashing, and the gap of the filter material is ensured, so that the water outlet quantity and the water quality of the biological aerated filter are not influenced. At present, the standard flow of the back washing of the biological aerated filter is that the liquid level of the filter is reduced, and then air washing, air water washing and water washing are sequentially carried out. In the back washing process of the existing standard flow, the liquid level is 90-100% of the height of the filter material, and after most of the filter material is in a wet or soaked state, the filter material is back washed by adopting gas washing, gas water washing and water washing. The method can remove the ss intercepted on the filter material of the object filter to a certain degree, and wash the microbial membrane which excessively grows and ages on the filter material. However, in the practical application of the biological aerated filter, although a backwashing process is adopted, the phenomenon of hardening of the filter material still often occurs, so that a large amount of manpower and material resources are required to be input, and even the filter is disassembled to be cleaned.
Disclosure of Invention
The invention aims to provide a backwashing method for a reinforced biological aerated filter, and aims to solve the problem that the filter material is hardened due to the unclean flushing of the conventional backwashing method.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a reinforced aeration biological filter backwashing method, which comprises the following steps:
closing control valves of a nitrification liquid return pipe and a water inlet lifting pipe, opening a vent pipe control valve, reducing the liquid level of the biological aerated filter, reducing the liquid level to 8-15% of the height of a filter material of the biological aerated filter, and closing the vent pipe control valve after the liquid level is maintained for more than or equal to 110 s;
opening a back flushing air valve, and performing back flushing air washing for 10 min; opening a back flushing water valve, and performing back flushing water washing for 10 min; and (5) closing the back flush air valve and washing for 10 min.
Preferably, when the filter material in the biological aerated filter is hardened, the time for reducing the liquid level of the biological aerated filter is kept for 8-100 min; when the filter materials in the biological aerated filter are not hardened, the time for reducing the liquid level of the biological aerated filter is kept for 110 s.
Preferably, in the step of reducing the liquid level of the biological aerated filter, the reduced liquid level is 10% of the height of the filter material of the biological aerated filter.
Preferably, the height of the biological aerated filter is 5m, the bottom area is 0.5m2, the spacing between filter heads is 11cm, and the height of filter materials is 3 m.
Preferably, in the step of reducing the liquid level of the biological aerated filter, the reduced liquid level is at a position of 0.3m of the height of the filter material in the biological aerated filter.
Preferably, the strength of the air washing is 90m3/m2H, strength of the washing with water of 30m3/m2/h。
The reinforced aeration biological filter tank back flushing method provided by the invention reduces the emptying liquid level by the reverse routine method, so that the liquid level is reduced to 8-15% of the height of the filter material in the aeration biological filter tank, and most of the filter material is in an anhydrous state. On one hand, the hardening of the filter material mainly occurs at the lowest end of the filter material layer, and the liquid level is emptied to the position where the hardening of the filter material is easy to occur, and then backwashing is carried out, so that the hardening dredging is facilitated; on the other hand, the filter material with a higher liquid level is more favorable for the shedding of microorganisms on the surface of the filter material corresponding to the water surface because the turbulence of the gas on the water surface is stronger. Therefore, through the synergy of the two aspects, the backwashing effect can be strengthened, the risk of blocking the filter material of the biological aerated filter is reduced, and the normal operation of the biological aerated filter process is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a biological aerated filter according to an embodiment of the invention;
FIG. 2 is a comparison graph of SS content in backwash water collected before and after a hardened filter material is treated by the enhanced biological aerated filter backwash method provided by the embodiment of the invention;
FIG. 3 is a graph comparing nitrifying liquid reflux data before and after a hardened filter material is treated by the reinforced aeration biological filter backwashing method provided by the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The embodiment of the invention provides a backwashing method for a reinforced aeration biological filter, which comprises the following steps:
s01, closing control valves of a nitrification liquid return pipe and a water inlet lifting pipe, opening a vent pipe control valve, reducing the liquid level of the biological aerated filter, reducing the liquid level to 8-15% of the height of a filter material of the biological aerated filter, and closing the vent pipe control valve after the liquid level is maintained to be more than or equal to 110 s;
s02, opening a back flushing air valve, and performing back flushing air washing for 10 min; opening a back flushing water valve, and performing back flushing water washing for 10 min; and (5) closing the back flush air valve and washing for 10 min.
The reinforced aeration biological filter backwashing method provided by the embodiment of the invention reduces the emptying liquid level by the reverse convention to reduce the liquid level to 8-15% of the height of the filter material of the aeration biological filter, so that most of the filter material is in an anhydrous state. On one hand, the hardening of the filter material mainly occurs at the lowest end of the filter material layer, and the liquid level is emptied to the position where the hardening of the filter material is easy to occur, and then backwashing is carried out, so that the hardening dredging is facilitated; on the other hand, the filter material with a higher liquid level is more favorable for the shedding of microorganisms on the surface of the filter material corresponding to the water surface because the turbulence of the gas on the water surface is stronger. Therefore, through the synergy of the two aspects, the backwashing effect can be strengthened, the risk of blocking the filter material of the biological aerated filter is reduced, and the normal operation of the biological aerated filter process is ensured.
In the embodiment of the invention, the biological aerated filter is a DN (digital volume distribution) filter, and comprises a water distribution chamber, a filter plate, a water distribution and gas distribution filter head and a supporting layer are arranged above the water distribution chamber, a filter material layer is arranged on the supporting layer, a clear water area is arranged above the filter material layer, and the water distribution chamber and the clear water area are provided with a series of communicating pipelines and valves, as shown in figure 1, the biological aerated filter comprises a nitrifying liquid return pipe 1, a water inlet lifting pipe 2, an air vent valve 3, an overflow port 4, a water outlet 5, a filter material 6, a back flushing air pipe 7, an air vent pipe 8 and a back flushing water pipe 9.
Specifically, in step S01, the control valves of the nitrification liquid return pipe and the water inlet lift pipe are closed, and the vent pipe control valve is opened to lower the liquid level of the biological filter. Compared with the conventional method for controlling the liquid level to enable most of filter materials to be in a water soaking or wet state, the embodiment of the invention greatly reduces the liquid level to 8-15% of the height of the filter materials in the biological aerated filter, so that the liquid level is maintained in a range of an area which is easy to harden, and the area of the filter materials higher than the area which hardens is kept in a non-water state, thereby facilitating the smooth flowing of gas in gaps among the filter materials. Preferably, in the step of reducing the liquid level of the biological aerated filter, the reduced liquid level is 10% of the height of the filter material of the biological aerated filter, so as to obtain a better backwashing effect. And the reduced liquid level is positioned at the position of 0.5m of the height of the filter material by using the height meter of the filter material, so that the optimal backwashing effect is achieved.
In the embodiment of the invention, the state of the biological aerated filter after the liquid level is reduced is kept for more than or equal to 110s, and the vent pipe control valve is closed. Further, the time for maintaining the state of the biological aerated filter after the liquid level is reduced includes two situations. As an implementation mode, when the filter material in the biological aerated filter is hardened, the liquid level of the biological aerated filter is reduced for 8-100min, so that the hardened area is as wet as possible, and the filter material area above the liquid level is as dry as possible, so that the hardened filter material is dredged through the subsequent air washing-water washing circulation process, and meanwhile, microorganisms on the surface of the filter material are removed. As another implementation mode, when the filter material in the biological aerated filter is not hardened, the biological aerated filter is only subjected to backwashing simply, and at the moment, the liquid level of the biological aerated filter is kept for 110s, so that the backwashing effect is enhanced, the risk of blocking the filter material in the biological aerated filter is reduced, and the normal operation of the biological aerated filter process is ensured.
As a particularly preferred embodiment, said exposing is carried outThe height of the air biological filter is 5m, and the bottom area is 0.5m2The distance between the filter heads is 11cm, and the height of the filter material is 3 m. Preferably, in the step of reducing the liquid level of the biological aerated filter, the reduced liquid level is at a position of 0.3m of the height of the filter material of the biological aerated filter, so that the optimal back washing effect is obtained, the risk of blockage of the filter material of the biological aerated filter is reduced, and the normal operation of the biological aerated filter process is ensured.
In the step S02, opening the back flush air valve, and back flush for 10 min; opening a back flushing water valve, and performing back flushing water washing for 10 min; and (5) closing the back flush air valve and washing for 10 min. Preferably, the strength of the air washing is 90m3/m2H, strength of the washing with water of 30m3/m2H is used as the reference value. Repeating the steps until the biological aerated filter meets the expected requirements.
The following description will be given with reference to specific examples.
Providing a biological aerated filter for treating 6 working days by adopting a conventional (PLC) backwashing process (reducing the liquid level of the filter to enable the liquid level to be 90-100% of the height of a filter material, and then sequentially carrying out air washing, air washing and water washing), wherein the height of the biological aerated filter is 5m, and the bottom area of the biological aerated filter is 0.5m2The interval between the filter heads is 11cm, the height of the filter material is 3m, and the backwashing of the aeration biological filter is reinforced, which comprises the following steps:
s11, closing control valves of a nitrification liquid return pipe and a water inlet lifting pipe, opening an emptying pipe control valve, reducing the liquid level of the biological aerated filter to enable the liquid level to be reduced to 0.3m of the height of a filter material of the biological aerated filter, and closing the emptying pipe control valve after emptying for 45 min;
s12, opening a back flushing air valve, and performing back flushing air washing for 10 min; opening a back flushing water valve, and performing back flushing water washing for 10 min; closing the back washing air valve, and washing for 10min, wherein the strength of the air washing is 90m3/m2H, strength of the washing with water of 30m3/m2/h；
And repeating the steps S11 and S12, and strengthening backwashing of the biological aerated filter for 6 days.
And taking the attenuation of the backwash water sample SS and the return flow of the nitrifying liquid during the water washing of the backwash gas as indexes of DN tank plate junction dredging, and recording data of 12 working days before and after backwashing. Wherein, the SS content comparison graph of the backwash water is shown in figure 1, and the nitration liquid reflux data comparison graph is shown in figure 2.
As can be seen, SS in the backwash water is maintained at 48-59mg/L within 6 working days before backwash by adopting the method of the embodiment of the invention, and the flow rate of the nitrified liquid is artificially set to be 3m3In the condition of/h, the reflux of the nitrified liquid is attenuated to 0m on the next day3H is used as the reference value. After the method disclosed by the embodiment of the invention is adopted for strengthening backwashing, the SS in the backwashing water is detected to be 134mg/L, and in the subsequent 6-day repeated backwashing, the SS is gradually increased and reaches the maximum value in the 9 th working day and then is reduced. The hardening of the filter material in the DN pool is thoroughly dredged. The corresponding return flow of the nitrified liquid is 3m which is more artificial3There was some decay in/h, however, there was a clear reading of nitrifying liquid reflux. After the method of the embodiment of the invention is adopted to strengthen the back washing for 1 day, the reflux quantity of the nitrifying liquid is gradually increased in the next day and is consistent with the reflux quantity of the nitrifying liquid after the back washing, thereby further explaining that the hardening of the filter material is thoroughly dredged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. A backwashing method for a reinforced aeration biological filter is characterized by comprising the following steps:
closing control valves of a nitrification liquid return pipe and a water inlet lifting pipe, opening an emptying pipe control valve, reducing the liquid level of the biological aerated filter, and keeping the liquid level within the range of an area easy to harden by reducing the liquid level to 8-15% of the height of a filter material of the biological aerated filter, wherein the emptying pipe control valve is closed after the time for reducing the liquid level of the biological aerated filter is kept for 8-100 min;
opening a back flushing air valve, and performing back flushing air washing for 10 min; opening a back flushing water valve, and performing back flushing water washing for 10 min; and (5) closing the back flush air valve and washing for 10 min.
2. The method for enhancing backwashing of a biological aerated filter according to claim 1, wherein in the step of reducing the liquid level of the biological aerated filter, the reduced liquid level is 10% of the height of the filter material of the biological aerated filter.
3. An enhanced biological aerated filter backwash method as claimed in claim 1 or 2, wherein the height of the biological aerated filter is 5m and the bottom area is 0.5m2The distance between the filter heads is 11cm, and the height of the filter material is 3 m.
4. The method for enhancing backwashing of a biological aerated filter according to claim 3, wherein in the step of reducing the liquid level of the biological aerated filter, the reduced liquid level is at 0.3m of the height of the filter material of the biological aerated filter.
5. An enhanced biological aerated filter backwash method as claimed in claim 1 or 2, wherein the strength of said air wash is 90m3/m2H, strength of the washing with water of 30m3/m2/h。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1827537A (en) * 2005-03-02 2006-09-06 深圳市清泉水***工程设备有限公司 Non-blocking aeration biological filter
CN102092849A (en) * 2011-01-07 2011-06-15 汤苏云 New denitrification and backwashing process of biofilter
CN203400540U (en) * 2013-08-08 2014-01-22 深圳市瑞源环境科技有限公司 Turnover plate filter tank with upward flow function
CN104817167A (en) * 2015-04-13 2015-08-05 安徽华骐环保科技股份有限公司 Water-level descending backwashing method for up-flow biological aerated filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1827537A (en) * 2005-03-02 2006-09-06 深圳市清泉水***工程设备有限公司 Non-blocking aeration biological filter
CN102092849A (en) * 2011-01-07 2011-06-15 汤苏云 New denitrification and backwashing process of biofilter
CN203400540U (en) * 2013-08-08 2014-01-22 深圳市瑞源环境科技有限公司 Turnover plate filter tank with upward flow function
CN104817167A (en) * 2015-04-13 2015-08-05 安徽华骐环保科技股份有限公司 Water-level descending backwashing method for up-flow biological aerated filter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"曝气生物滤池滤料板结的防治";王劼 等;《中国给水排水》;20090831;第25卷(第16期);第91—92页全部内容 *

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