CN110885159A - Deep biological denitrification process for sewage - Google Patents
Deep biological denitrification process for sewage Download PDFInfo
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- CN110885159A CN110885159A CN201811039993.8A CN201811039993A CN110885159A CN 110885159 A CN110885159 A CN 110885159A CN 201811039993 A CN201811039993 A CN 201811039993A CN 110885159 A CN110885159 A CN 110885159A
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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
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
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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
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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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- Biodiversity & Conservation Biology (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)
- Biological Treatment Of Waste Water (AREA)
Abstract
A sewage deep biological denitrification process comprises the following steps: (1) sewage enters an anoxic bin, supernatant is obtained after anoxic biological reaction occurs in the anoxic bin, the supernatant enters a deep denitrification bin through an upper opening of a partition wall, and MBBR reaction and biological denitrification reaction are carried out in the deep denitrification bin; the anoxic bin and the deep denitrification bin are communicated with each other through the lower opening of the partition wall; (2) when the supernatant liquid is subjected to MBBR reaction and biological denitrification reaction in the deep denitrification bin, the back flushing aeration device and the back flushing device respectively act in the MBBR reaction and the biological denitrification reaction. The invention has the advantages of high efficiency, simplicity, low cost, no secondary pollution and no interference from environmental factors.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage deep biological denitrification process.
Background
In recent years, with the development of industry and agriculture, the eutrophication problem of water bodies is increasingly prominent, and the influence of ammonia nitrogen wastewater on the environment has attracted great attention in the environmental protection field in the global scope. Along with the increasing strengthening of the requirement of the discharge of the external wastewater reaching the standard and the continuous strengthening of the enforcement of environmental protection, the difficulty of the wastewater treatment with high ammonia nitrogen content is increased. Sewage treatment plants in various countries seek for technically applicable and economically feasible treatment methods of ammonia nitrogen wastewater, particularly certain catalyst wastewater, which exceeds the sewage discharge standard because of low organic content and high ammonia nitrogen concentration.
At present, ammonia nitrogen wastewater in China is expanded from cities to vast rural areas, non-point source pollution is increasingly serious, and a large amount of high-concentration ammonia nitrogen wastewater which is not treated is directly discharged into ditches and rivers due to the lag of the construction of sewage treatment facilities and finally enters into receiving water bodies such as lakes and the like, so that the pollution of water environment is aggravated. Most of the existing sewage treatment plants built and operated in China, especially urban sewage plants, adopt the traditional activated sludge method and the deformation process thereof, but the traditional activated sludge treatment process has the problems of unsatisfactory ammonia nitrogen removal and poor water treatment effect, and a large amount of excess sludge needs to be discharged periodically in the activated sludge treatment process, the excess sludge contains various pollutants and can be discharged after the excess sludge is treated, the sewage treatment cost is increased, and the activated sludge method is not suitable for adopting overhigh organic load, so the tank volume needs to be large, and the occupied area of the activated sludge method is large.
Ammonia nitrogen in the wastewater can be treated by physical and chemical methods such as stripping, ion exchange, chemical oxidation and the like, but the methods have the problems of secondary pollution of byproducts, low efficiency and the like. In contrast, the biological method is a better method for controlling ammonia nitrogen pollution of water. However, in the biological method, ammonia nitrogen is removed by nitrification of nitrifying bacteria in both the conventional nitrification-denitrification process and the novel short-cut nitrification-denitrification and short-cut nitrification-anoxic ammonia oxidation processes. The nitrifying bacteria are chemoautotrophic bacteria, have the characteristics of autotrophic property, aerobic property, attachment, acid production and the like, have long generation time and slow propagation speed because the nitrifying bacteria oxidize inorganic carbon to be used as a unique energy source, and can not solve the problem of removing ammonia nitrogen with high concentration and difficult removal in common activated sludge.
At present, the national requirements for the effluent of municipal sewage treatment plants are higher and higher, and areas such as Taihu lake and the like have been forced to execute the first-class A standard. The main factors which are difficult to reach the high standard in the effluent indexes of sewage plants are total phosphorus and total nitrogen. At present, the enhanced removal of total phosphorus is mainly enhanced biological removal or chemical agents are added, and the total phosphorus index can be controlled to a certain extent. Although adding chemical agents can increase the cost, chemical enhanced phosphorus removal is a simple and effective control mode in areas with strict water discharge indexes. The removal mechanism of the total nitrogen is mainly biological denitrification, and a simple and effective method for controlling the total nitrogen of the effluent is difficult to find and can only be controlled by adjusting process parameters and an operation state, so that the total nitrogen index greatly influences the implementation of the first-class A standard in a sewage plant.
At present, the following main reasons why the total nitrogen index cannot reach the standard or cannot be upgraded to the first-class A standard because the total nitrogen index has poor operation condition are as follows: the whole system has no denitrification function; the system has denitrification function, but the carbon source of the inlet water is insufficient; the system has a denitrification function, but the total nitrogen of inlet water is higher, and the total nitrogen of outlet water is higher than the requirement due to the limitation of the reflux ratio; the system is synchronous nitrification and denitrification, and certain influence exists among the systems.
Disclosure of Invention
The invention provides a sewage deep biological denitrification process for solving the problems that the existing water treatment method has poor treatment effect, ammonia nitrogen and total nitrogen are difficult to reach the standard stably throughout the year and the sewage treatment cost is high.
In order to realize the invention, the following technical scheme is adopted, and the process for deep biological denitrification of sewage comprises the following steps:
(1) sewage enters an anoxic bin, supernatant is obtained after anoxic biological reaction occurs in the anoxic bin, the supernatant enters a deep denitrification bin through an upper opening of a partition wall, and MBBR reaction and biological denitrification reaction are carried out in the deep denitrification bin; the anoxic bin and the deep denitrification bin are communicated with each other through the lower opening of the partition wall;
(2) the supernatant liquid is subjected to MBBR reaction and biological denitrification reaction in the deep denitrification bin, and the back flushing aeration device and the back flushing device respectively act in the MBBR reaction and the biological denitrification reaction;
(3) the supernatant enters the multistage filtering bin after the reaction in the deep denitrification bin is finished, a supercharger is arranged on the outer side of the multistage filtering bin, and when the supernatant is filtered in the multistage filtering bin, the supercharger works to enable the supernatant to be filtered more thoroughly;
(4) and after filtering the supernatant in the multistage filtering bin, inputting the supernatant into a clear water bin for standing.
Further, the sludge water in the anoxic bin and the deep denitrification bin is back flushed and then discharged out of the sludge settling tank through a back flushing sludge water pipeline.
Furthermore, the filter material in the multistage filter bin comprises a granular filter material and a three-dimensional filter material which are mixed.
Furthermore, the granular filter material is ceramsite, activated carbon, coke, coconut shell granules, quartz sand, anthracite or zeolite granular filler.
Furthermore, the three-dimensional filter material is Raschig rings, pall rings, plastic spherical filler and semi-soft filler.
Further, the deep denitrification bin is provided with a total nitrogen monitor.
Furthermore, the effective volume ratio of the anoxic bin, the deep denitrification bin and the multistage filtering bin is 1:2: 0.8-1: 4: 1.2.
Has the advantages that: (1) the invention has the advantages of high efficiency, simplicity, low cost, no secondary pollution and no interference from environmental factors.
(2) The anoxic bin, the deep denitrification bin and the multistage filter bin are sequentially communicated, so that the whole process flow is more compact, the occupied area is reduced, and the integral arrangement and operation management are facilitated.
Detailed Description
Example (b): a sewage deep biological denitrification process comprises the following steps:
(1) sewage enters an anoxic bin, supernatant is obtained after anoxic biological reaction occurs in the anoxic bin, the supernatant enters a deep denitrification bin through an upper opening of a partition wall, and MBBR reaction and biological denitrification reaction are carried out in the deep denitrification bin; the anoxic bin and the deep denitrification bin are communicated with each other through the lower opening of the partition wall;
(2) the supernatant liquid is subjected to MBBR reaction and biological denitrification reaction in the deep denitrification bin, and the back flushing aeration device and the back flushing device respectively act in the MBBR reaction and the biological denitrification reaction;
(3) the supernatant enters the multistage filtering bin after the reaction in the deep denitrification bin is finished, a supercharger is arranged on the outer side of the multistage filtering bin, and when the supernatant is filtered in the multistage filtering bin, the supercharger works to enable the supernatant to be filtered more thoroughly;
(4) and after filtering the supernatant in the multistage filtering bin, inputting the supernatant into a clear water bin for standing.
And the sludge water in the anoxic bin and the deep denitrification bin is discharged out of the sludge sedimentation tank through a backwashing sludge water pipeline after backwashing.
The filter material in the multistage filter bin comprises granular filter material and three-dimensional filter material which are mixed.
The granular filter material is ceramsite, activated carbon, coke, coconut shell granules, quartz sand, anthracite or zeolite granular filler.
The three-dimensional filter material is Raschig rings, pall rings, plastic spherical filler and semi-soft filler.
The deep denitrification bin is provided with a total nitrogen monitor.
The effective volume ratio of the anoxic bin, the deep denitrification bin and the multistage filtering bin is 1:2.5: 0.9.
Claims (7)
1. The deep biological denitrification process for sewage is characterized by comprising the following steps of:
(1) sewage enters an anoxic bin, supernatant is obtained after anoxic biological reaction occurs in the anoxic bin, the supernatant enters a deep denitrification bin through an upper opening of a partition wall, and MBBR reaction and biological denitrification reaction are carried out in the deep denitrification bin; the anoxic bin and the deep denitrification bin are communicated with each other through the lower opening of the partition wall;
(2) the supernatant liquid is subjected to MBBR reaction and biological denitrification reaction in the deep denitrification bin, and the back flushing aeration device and the back flushing device respectively act in the MBBR reaction and the biological denitrification reaction;
(3) the supernatant enters the multistage filtering bin after the reaction in the deep denitrification bin is finished, a supercharger is arranged on the outer side of the multistage filtering bin, and when the supernatant is filtered in the multistage filtering bin, the supercharger works to enable the supernatant to be filtered more thoroughly;
(4) and after filtering the supernatant in the multistage filtering bin, inputting the supernatant into a clear water bin for standing.
2. The process of claim 1, wherein the sludge water in the anoxic and the deep denitrification chambers is discharged through the backwashing sludge water pipeline to the sludge settling tank after backwashing.
3. The process of claim 1, wherein the filter material in the multistage filter bin comprises a mixture of granular filter material and solid filter material.
4. The process of claim 1, wherein the granular filter material is ceramsite, activated carbon, coke, coconut shell granules, quartz sand, anthracite or zeolite granular filler.
5. The deep biological nitrogen removal process for sewage water as claimed in claim 1, wherein the three-dimensional filter material is Raschig ring, pall ring, plastic spherical filler or semi-soft filler.
6. The process of claim 1, wherein the deep denitrification tank is provided with a total nitrogen monitor.
7. The deep biological denitrification process for sewage as recited in claim 1, wherein the effective volume ratio of the anoxic bin, the deep denitrification bin and the multistage filtration bin is 1:2: 0.8-1: 4: 1.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811039993.8A CN110885159A (en) | 2018-09-07 | 2018-09-07 | Deep biological denitrification process for sewage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811039993.8A CN110885159A (en) | 2018-09-07 | 2018-09-07 | Deep biological denitrification process for sewage |
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| CN110885159A true CN110885159A (en) | 2020-03-17 |
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| CN201811039993.8A Pending CN110885159A (en) | 2018-09-07 | 2018-09-07 | Deep biological denitrification process for sewage |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102910788A (en) * | 2012-11-13 | 2013-02-06 | 南京大学 | Deep denitrification process for wastewater |
| CN105923906A (en) * | 2016-05-30 | 2016-09-07 | 中国科学院生态环境研究中心 | Structure and method for treating sewage through coupling multi-point water inlet biological membrane with phosphorus adsorption device |
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2018
- 2018-09-07 CN CN201811039993.8A patent/CN110885159A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102910788A (en) * | 2012-11-13 | 2013-02-06 | 南京大学 | Deep denitrification process for wastewater |
| CN105923906A (en) * | 2016-05-30 | 2016-09-07 | 中国科学院生态环境研究中心 | Structure and method for treating sewage through coupling multi-point water inlet biological membrane with phosphorus adsorption device |
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Application publication date: 20200317 |