CN111718068A - Water distribution method for solving drop oxygenation of denitrification biological filter - Google Patents
Water distribution method for solving drop oxygenation of denitrification biological filter Download PDFInfo
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- CN111718068A CN111718068A CN202010602240.4A CN202010602240A CN111718068A CN 111718068 A CN111718068 A CN 111718068A CN 202010602240 A CN202010602240 A CN 202010602240A CN 111718068 A CN111718068 A CN 111718068A
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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
- C02F3/28—Anaerobic digestion processes
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a water distribution method for solving drop oxygenation of a denitrification biological filter, which comprises the following water distribution modes: the system comprises a main water inlet pipe, a water distribution main canal, a water inlet pipe and each grid of filter tank; the denitrification biological filter tank is totally fed with water to a water distribution main channel, the water distribution main channel is provided with the quantity of water inlet pipes according to the number of filter tank grids, the water enters each filter tank through the water inlet pipes, the water is distributed through a filter head and then passes through a pebble layer and a filter material layer, and finally the water is discharged to a clear water area; the whole process from water inlet to water outlet has no water drop. The method overcomes the problems of uneven water distribution, serious drop oxygenation, denitrification inhibition, high operation cost and the like of the water distribution of the traditional water distribution well, can realize even water distribution of the filter, can solve the drop oxygenation problem of the denitrification biological filter fundamentally and reduce the operation cost.
Description
Technical Field
The invention relates to a sewage treatment process, in particular to a water distribution method of a denitrification biofilter process.
Background
The denitrifying biological filter tank process belongs to one form of aeration biological filter tank process, and has the main function of biological denitrification. The working principle is as follows: sewage enters a water distribution chamber of each filter after water distribution, water is uniformly distributed through a long-handle filter head, upward flow of the sewage and a biological membrane produced on the surface of a filter material generate denitrification reaction, namely, under the anoxic condition, a high-activity denitrification biological bacterial membrane attached and grown on the surface of the filter material takes nitrite and nitrate as electron acceptors and organic matters as electron donors, and nitrogen in the nitrate and the nitrite is reduced into nitrogen through a series of intermediate products and enters the atmosphere, so that the aim of biological denitrification is fulfilled. The microorganisms need to maintain strict anoxic conditions for denitrification. Dissolved oxygen has an inhibitory effect on the denitrification process, mainly because oxygen competes with nitrate for an electron donor, and molecular oxygen inhibits the synthesis and activity of nitrate reductase. After the denitrification biological filter tank operates for a period of time, backwashing is needed, and the filter tank is designed to be used in parallel in a plurality of grids, so that the uniformity of a water distribution system can also influence the denitrification function.
The traditional water distribution mode of the denitrification filter tank at present is water inlet-a water distribution main channel-each water distribution well-a water inlet pipe-each filter tank. Two problems exist with this water distribution approach: (1) the water distribution main channel is long, the water distribution wells are arranged in a grid manner along the parallel direction of the water distribution main channel, the main channel and the water distribution wells distribute water through the equal weirs, and as the walking path of sewage in the main channel is too long, the water amount actually entering each filter pool is different, and the uniform water distribution function is not realized; (2) the filter tank runs periodically, the resistance of the filter material layer is gradually changed, the water purification head required by the filter tank is not constant, the normal water passing capacity is ensured under the condition of considering the maximum resistance of the filter material layer in the actual engineering, and the designed liquid level in the water distribution well is considered according to the maximum value. After the backwashing of the filter tank is finished, the resistance of a filter material layer is reduced, the liquid level in a water distribution well is reduced, the liquid level difference exists before and after the water distribution weir, the phenomenon of serious water drop oxygenation is caused, the dissolved oxygen in water is increased, the denitrification reaction is inhibited, the adding amount of a carbon source needs to be increased to consume the dissolved oxygen in the water, and the operation cost is increased.
Disclosure of Invention
The invention relates to a water distribution method for solving drop oxygenation of a denitrification biological filter, which comprises the following steps:
(1) the drop-free oxygenated water distribution mode is as follows: water inlet, water distribution main canal, water inlet pipe and each lattice filter;
(2) the process of non-drop water oxygenation and water distribution: a pneumatic or electric regulating valve and an electromagnetic flowmeter are arranged on the water inlet pipe of each filter; the water inflow of each filter cell is read through an electromagnetic flowmeter, and the increase and decrease of the water inflow are realized by adjusting the opening degree of a valve body of a pneumatic or electric adjusting valve. The water inlet of the denitrification biological filter firstly flows to a water distribution main channel, the water distribution main channel is provided with the quantity of water inlet pipes according to the number of filter chambers, the water enters each filter chamber through the water inlet pipes, the water is distributed through a filter head and then passes through a pebble layer and a filter material layer, and finally the water is discharged to a clear water area. The whole process from water inlet to water outlet has no water drop.
(3) The logic program of the automatic control system for oxygenation and water distribution without drop: reading signals of an electromagnetic flowmeter on a water inlet pipe of each filter are transmitted to a programmable logic controller (PLC system), the average inflow limiting range of each filter is determined through data collection and automatic calculation, whether the inflow of each filter deviates from the allowable inflow range is judged, and when the actual inflow exceeds the upper limit of the allowable value, feedback signals automatically control a pneumatic or electric regulating valve to reduce the opening degree of a valve body; when the actual water inlet flow is smaller than the upper limit of the allowable value, the feedback signal automatically controls the pneumatic or electric adjusting butterfly valve, and the opening degree of the valve body is increased.
The invention can solve the following problems:
1. thoroughly solves the problem of drop oxygenation in the water distribution process of the denitrification biological filter.
2. Compared with the water distribution of the traditional water distribution well, the water distribution is more uniform and controllable through automatic control program control.
3. The design of a distribution well is cancelled, the complexity of a civil structure is reduced, the engineering quantity is reduced, and the capital investment is reduced.
4. Because the drop oxygenation problem is avoided, the function of the denitrification biological filter is improved, the effluent quality is improved, the carbon source consumption is reduced, and the operation cost is saved.
5. Because the water distribution is more uniform, the stability of the operation condition of each filter is improved, and the quality of the outlet water is more stable.
Drawings
FIG. 1 is a schematic structural diagram of a denitrification biological filter according to the invention.
FIG. 2 is a flow control diagram of the waterfall-free oxygenated water distribution method of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A water distribution method for solving drop water oxygenation of a denitrification biological filter, wherein the denitrification biological filter comprises a water distribution main canal 1, a water inlet pipe 3, a pneumatic (electric) regulating valve 4, an electromagnetic flowmeter 5, a PLC (programmable logic controller) 6, a long-handle filter head 7, a filter plate 8, a pebble layer 9, a filter material layer 10, a clear water area 11, a backwashing drainage canal 12, a normal water outlet canal 13 and a single-lattice filter 14.
(1) Water distribution mode:
the water inlet-distribution main canal 1, the water inlet pipe 3 and the single-lattice filter 14.
(2) The water distribution process comprises the following steps:
the inlet water enters the inlet pipe 3 from the water distribution main channel 1, the opening degree of a valve body of a feedback regulation pneumatic or electric regulating valve 4 is calculated and fed back through a PLC (programmable logic controller) programming logic controller 6 according to a flow value fed back by an electromagnetic flowmeter 5, so that the water enters each filter 14, the water is uniformly distributed through a long-handle filter head 7 and enters a bearing layer 9 and a filter material layer 10, and the filter plate 8 plays a role in fixing the filter head and plays a role in supporting the bearing layer 9 and the filter material layer 10. Then the sewage is subjected to denitrification, adsorption, interception and other actions in the filter material layer 10, and the effluent enters a normal drainage channel 12 to be discharged after reaching a clear water area 11.
(3) Logic program of the automatic control system:
the reading signal of the electromagnetic flowmeter 5 on the water inlet pipe 3 of each filter 14 is transmitted to the PLC 6, the average inflow limiting range of each filter is determined through data collection and automatic calculation, whether the inflow of each filter deviates from the allowable inflow range is judged, and when the actual inflow exceeds the upper limit of the allowable value, the feedback signal automatically controls the pneumatic or electric regulating valve 4 to reduce the opening degree of the valve body; when the actual water inlet flow is smaller than the upper limit of the allowable value, the feedback signal automatically controls the pneumatic or electric adjusting butterfly valve 4, and the opening degree of the valve body is increased.
Claims (2)
1. A water distribution method for solving drop oxygenation of a denitrification biological filter comprises the following steps:
(1) the drop-free oxygenated water distribution mode is as follows: water inlet, water distribution main canal, water inlet pipe and each lattice filter;
(2) the process of non-drop water oxygenation and water distribution: a pneumatic or electric regulating valve and an electromagnetic flowmeter are arranged on the water inlet pipe of each filter; the water inlet flow of each filter cell is read by an electromagnetic flowmeter, and the increase and decrease of the water inlet flow are realized by adjusting the opening degree of a valve body of a pneumatic or electric adjusting valve; the denitrification biological filter feeds water to a water distribution main canal, the water distribution main canal is provided with the quantity of water inlet pipes according to the number of filter chambers, the water enters each filter chamber through the water inlet pipes, the water is distributed through a filter head and then passes through a pebble layer and a filter material layer, and finally the water is discharged to a clear water area; the whole process from water inlet to water outlet has no water drop.
(3) The logic program of the automatic control system for oxygenation and water distribution without drop: the reading signal of the electromagnetic flowmeter on the water inlet pipe of each filter cell is transmitted to a PLC (programmable logic controller), the average inlet water flow limit range of each filter cell is determined through data collection and automatic calculation to judge whether the inlet water flow of each filter cell deviates from the allowable inlet water flow range, and when the actual inlet water flow exceeds the allowable upper limit, the feedback signal automatically controls a pneumatic or electric regulating valve to reduce the opening degree of the valve body; when the actual water inlet flow is smaller than the upper limit of the allowable value, the feedback signal automatically controls the pneumatic or electric adjusting butterfly valve, and the opening degree of the valve body is increased.
2. The method for distributing water for solving drop oxygenation of the denitrification biological filter tank as claimed in claim 1, wherein the denitrification biological filter tank is in an upward flow water mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010602240.4A CN111718068A (en) | 2020-06-28 | 2020-06-28 | Water distribution method for solving drop oxygenation of denitrification biological filter |
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| CN202010602240.4A CN111718068A (en) | 2020-06-28 | 2020-06-28 | Water distribution method for solving drop oxygenation of denitrification biological filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112755797A (en) * | 2020-12-30 | 2021-05-07 | 北京城市排水集团有限责任公司 | Method and system for improving and transforming water yield of membrane system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195499A (en) * | 2006-12-08 | 2008-06-11 | 深圳市清泉水业股份有限公司 | Automatic equalization method and structure of water load of upward flow water filtering pool |
| JP6432961B1 (en) * | 2018-06-21 | 2018-12-05 | 南京大学 | Integrated apparatus for treating low carbon to nitrogen ratio wastewater and its operating method |
| CN111115990A (en) * | 2020-03-13 | 2020-05-08 | 广东正诚环境科技有限公司 | Denitrification filter tank system |
| CN111196629A (en) * | 2020-03-10 | 2020-05-26 | 安徽绿衡环保科技有限公司 | Drop oxygenation control system for upflow denitrification biological filter |
| CN111333263A (en) * | 2020-03-09 | 2020-06-26 | 广州市环境保护工程设计院有限公司 | Multistage drop reoxygenation combined facultative biological filter sewage treatment system |
-
2020
- 2020-06-28 CN CN202010602240.4A patent/CN111718068A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195499A (en) * | 2006-12-08 | 2008-06-11 | 深圳市清泉水业股份有限公司 | Automatic equalization method and structure of water load of upward flow water filtering pool |
| JP6432961B1 (en) * | 2018-06-21 | 2018-12-05 | 南京大学 | Integrated apparatus for treating low carbon to nitrogen ratio wastewater and its operating method |
| CN111333263A (en) * | 2020-03-09 | 2020-06-26 | 广州市环境保护工程设计院有限公司 | Multistage drop reoxygenation combined facultative biological filter sewage treatment system |
| CN111196629A (en) * | 2020-03-10 | 2020-05-26 | 安徽绿衡环保科技有限公司 | Drop oxygenation control system for upflow denitrification biological filter |
| CN111115990A (en) * | 2020-03-13 | 2020-05-08 | 广东正诚环境科技有限公司 | Denitrification filter tank system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112755797A (en) * | 2020-12-30 | 2021-05-07 | 北京城市排水集团有限责任公司 | Method and system for improving and transforming water yield of membrane system |
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Application publication date: 20200929 |