CN115353197A - Denitrification treatment process for removing total nitrogen in sewage - Google Patents
Denitrification treatment process for removing total nitrogen in sewage Download PDFInfo
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- CN115353197A CN115353197A CN202210742799.6A CN202210742799A CN115353197A CN 115353197 A CN115353197 A CN 115353197A CN 202210742799 A CN202210742799 A CN 202210742799A CN 115353197 A CN115353197 A CN 115353197A
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- 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
Abstract
The invention discloses a denitrification treatment process for removing total nitrogen in sewage, which comprises the following steps: s1: preparing a carbon source and denitrifying strains; s2: spreading a carbon source in the treatment pool, and waiting for the carbon source to be uniformly distributed; s3, starting the treatment tank for aeration, and adding denitrifying strains after 5-7 hours of aeration; s4: continuously aerating for 12-16h, standing for 24h, and starting intermittent aeration; s5: sampling and detecting the content of nitrogen element; the carbon source comprises 25-30% of crushed straw, 5-10% of crushed rotten wood, 5-7% of glucose, 7-15% of phosphorus source buffering agent and 38-58% of activated sludge; the component of the phosphorus source buffering agent is K 2 HPO 4 (ii) a The denitrifying bacteria strain comprises 70-75% of denitrifying bacteria powder, 10-15% of methanol and 10-20% of ethanol. The invention can effectively ensure the comprehensive and effective denitrification reaction in the treatment tank by adopting a treatment mode of cyclic intermittent aeration while ensuring the survival rate of denitrifying bacteria, and can effectively reduce the total nitrogen content of the sewage.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a denitrification treatment process for removing total nitrogen in sewage.
Background
In the sewage treatment process, the total nitrogen index of sewage is one of important indexes of sewage discharge, and with the gradual importance of people on environmental protection, the index of sewage treatment is gradually improved, so that the total nitrogen content of sewage is reduced.
Through massive search, the prior art is found, and the publication number is as follows: CN101580299B, discloses a method and a device for sewage denitrification treatment by a membrane aeration mode. The method for carrying out denitrification treatment of sewage by using the membrane aeration mode comprises the following steps: firstly, a gaseous carbon source is delivered to the membrane; and secondly, supplying a gas carbon source serving as denitrification through the membrane cavity, and performing sewage denitrification treatment by adopting a membrane aeration mode under the condition of keeping the gas partial pressure lower than the bubble point. The device comprises a water inlet part, a water outlet part, a sewage denitrification treatment part through membrane aeration and a gas carbon source adding working part, wherein the water inlet part is connected with the sewage denitrification treatment part through membrane aeration, and the sewage denitrification treatment part through membrane aeration is respectively connected with the water outlet part and the gas carbon source adding working part. The invention can well increase the transmission efficiency of the external gas carbon source in water, reduce the diameter of the bubbles, prolong the retention time of the bubbles in the water, greatly improve the utilization rate of the gas and have high engineering application value.
In summary, in the existing way of reducing total nitrogen in the denitrification sewage treatment, the added denitrifying bacteria lack certain guarantee measures, although a carbon source is added in the treatment process for providing nutrients for the denitrifying bacteria, when the denitrifying bacteria are put into the reaction tank, most of the denitrifying bacteria are in a state of lacking nutrients, so that the survival rate of the denitrifying bacteria is not high, after the denitrifying bacteria are put into the reaction tank, the denitrifying bacteria need to propagate for a certain time to reach an ideal reaction strain community, thus the treatment time is increased, and the bacterial colony and the nutrients are impacted in the aeration stage, so that effective standing and aeration mixed circulation is lacked, the reaction is not thorough and comprehensive, and the reduction of the total nitrogen content in the sewage is lacked effective promotion effect.
Disclosure of Invention
The invention aims to provide a denitrification treatment process for removing total nitrogen in sewage, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a denitrification treatment process for removing total nitrogen in sewage comprises the following steps:
s1: preparing a carbon source and denitrifying strains;
s2: spreading a carbon source in the treatment pool, and waiting for the carbon source to be uniformly distributed;
s3, starting the treatment tank for aeration, and adding denitrifying strains after 5-7 hours of aeration;
s4: continuously aerating for 12-16h, standing for 24h, and starting intermittent aeration;
s5: sampling and detecting the content of nitrogen element.
Preferably, in S1 based on the denitrification treatment process step:
the carbon source comprises 25-30% of crushed straw, 5-10% of crushed rotten wood, 5-7% of glucose, 7-15% of phosphorus source buffering agent and 38-58% of activated sludge;
the component of the phosphorus source buffering agent is K 2 HPO 4 The active sludge is the sludge after washing and centrifugal treatment, and the granularity of the sludge is less than 0.1mm.
Preferably, in S1 based on the denitrification treatment process step:
the denitrifying bacteria seed components comprise 70-75% of denitrifying bacteria powder, 10-15% of methanol and 10-20% of ethanol, wherein the denitrifying bacteria powder is used for providing denitrifying bacteria, and the methanol and the ethanol are used for providing carbon sources for supplementing the denitrifying bacteria to the denitrifying bacteria seeds so as to ensure the survival rate of the denitrifying bacteria.
Preferably, in S2 based on the denitrification treatment process step:
and (3) putting the prepared carbon source into the treatment pool according to the proportion of 60-70% of the total weight, and freely diffusing the carbon source in the treatment pool according to the water flow in the treatment pool.
Preferably, in S3 based on the denitrification treatment process step:
after the carbon source is diffused in the treatment tank, an aeration switch of the treatment tank is turned on, the sewage in the treatment tank is aerated, after 5-7 hours of aeration treatment, 60-70% of the total weight of the prepared denitrifying bacteria is scattered in the treatment tank, and aeration treatment is carried out again.
Preferably, in S4 based on the denitrification treatment process step:
after the denitrifying strains are added, continuously starting an aeration switch of the treatment tank, carrying out continuous aeration treatment on the processor for 12-16h, standing for 24h after the aeration treatment is finished, and waiting for the comprehensive reaction of the denitrifying strains;
the intermittent aeration steps are as follows:
standing for 24h, adding 5-10% of the total weight of the rest carbon source and 5-10% of the total weight of the rest denitrifying bacteria, carrying out aeration treatment after the addition is finished, wherein the aeration treatment time is 3-5h, standing for 6-12h after the intermittent aeration treatment, and circularly carrying out the intermittent aeration treatment until the carbon source and the denitrifying bacteria are all put into the treatment tank.
Preferably, in S5 based on the denitrification treatment process step:
and after the aeration treatment is finished, randomly sampling the sewage in the treatment tank, testing the sample, detecting the total nitrogen content in the sewage, discharging the sewage to perform subsequent treatment after meeting the standard, continuing the intermittent aeration treatment when not meeting the standard, wherein the intermittent aeration treatment time is 2-5h, and standing for 1-3h.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, methanol and ethanol are added into denitrifying bacteria to serve as nutrient substances of the denitrifying bacteria, so that the survival rate and sufficient nutrient substances of the denitrifying bacteria before putting are ensured, the prolonged reaction time caused by low survival rate of the denitrifying bacteria before putting is avoided, the sufficient reaction time and proliferation time of the denitrifying bacteria are provided after long-time aeration and standing are carried out, and cyclic intermittent aeration and standing treatment are carried out, so that the comprehensiveness of the denitrifying treatment is effectively ensured, and the effect of effectively reducing the total nitrogen content of sewage is effectively achieved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships only for the convenience of description and simplification of the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides three embodiments:
the first embodiment is as follows:
a denitrification treatment process for removing total nitrogen in sewage comprises the following steps:
s1: preparing a carbon source and denitrifying bacteria; the carbon source comprises 25-30% of straw crushed material, 5-10% of rotten wood crushed material, 5-7% of glucose, 7-15% of phosphorus source buffer and 38-58% of activated sludge; the component of the phosphorus source buffering agent is K 2 HPO 4 The device is used for providing a phosphorus source and is used as a buffering agent, wherein activated sludge is sludge subjected to washing and centrifugal treatment, and the granularity of the sludge is less than 0.1mm; the denitrifying bacteria seed component comprises 70-75% denitrifying bacteria powder, 10-15% methanol and 10-20% ethanol, the denitrifying bacteria powder is used for providing denitrifying bacteria,the methanol and the ethanol are used for providing carbon sources for supplementing the denitrifying bacteria for the denitrifying bacteria, and the survival rate of the denitrifying bacteria is ensured.
S2: spreading a carbon source in the treatment pool, and waiting for the carbon source to be uniformly distributed; and (3) putting the prepared carbon source into the treatment pool according to the proportion of 60-70% of the total weight, and freely diffusing the carbon source in the treatment pool according to the water flow in the treatment pool.
S3, starting the treatment tank for aeration, and adding denitrifying strains after 5-7 hours of aeration; after the carbon source is diffused in the treatment tank, an aeration switch of the treatment tank is turned on, the sewage in the treatment tank is aerated, after 5-7 hours of aeration treatment, 60-70% of the total weight of the prepared denitrifying bacteria is scattered in the treatment tank, and aeration treatment is carried out again.
S4: continuously aerating for 12-16h, standing for 24h, and starting intermittent aeration; after the denitrifying strains are added, continuously starting an aeration switch of the treatment tank, carrying out continuous aeration treatment on the processor for 12-16h, standing for 24h after the aeration treatment is finished, and waiting for the comprehensive reaction of the denitrifying strains;
the intermittent aeration steps are as follows:
and standing for 24 hours, adding 5-10% of the total weight of the residual carbon source and 5-10% of the total weight of the denitrifying bacteria, carrying out aeration treatment after the addition is finished, wherein the aeration treatment time is 3-5 hours, standing for 6-12 hours after intermittent aeration treatment, and carrying out intermittent aeration treatment in a circulating manner until the carbon source and the denitrifying bacteria are all put into the treatment tank.
S5: sampling and detecting the content of nitrogen element; and after the aeration treatment is finished, randomly sampling the sewage in the treatment tank, testing the sample, detecting the total nitrogen content in the sewage, discharging the sewage to perform subsequent treatment after meeting the standard, continuing the intermittent aeration treatment when not meeting the standard, wherein the intermittent aeration treatment time is 2-5h, and standing for 1-3h.
The sewage after the secondary intermittent aeration treatment is sampled again until the total nitrogen content of the sewage is lower than a set value, methanol and ethanol are added into denitrifying bacteria to serve as nutrient substances of denitrifying bacteria, the survival rate and sufficient nutrient substances of the denitrifying bacteria before feeding are guaranteed, the prolonged reaction time caused by the low survival rate of the denitrifying bacteria before feeding is avoided, the sufficient reaction time and proliferation time of the denitrifying bacteria are given after long-time aeration and standing, and the cyclic intermittent aeration and standing treatment are carried out, so that the comprehensiveness of the denitrifying treatment is effectively guaranteed, and the effect of effectively reducing the total nitrogen content of the sewage is effectively achieved.
Example two:
the denitrification treatment process comprises the following steps:
s1: preparing a carbon source and denitrifying strains; the carbon source comprises 25-30% of straw crushed material, 5% of rotten wood crushed material, 5% of glucose, 7% of phosphorus source buffer and 58% of activated sludge; the component of the phosphorus source buffering agent is K 2 HPO 4 The device is used for providing a phosphorus source and is used as a buffering agent, wherein activated sludge is cleaned and centrifugally treated, and the granularity of the sludge is less than 0.1mm; the components of the denitrifying bacteria strain comprise 70% of denitrifying bacteria powder, 10% of methanol and 10% of ethanol, wherein the denitrifying bacteria powder is used for providing the denitrifying bacteria, and the methanol and the ethanol are used for providing carbon sources for supplementing the denitrifying bacteria to the denitrifying bacteria strain, so that the survival rate of the denitrifying bacteria is ensured.
S2: spreading a carbon source in the treatment tank, and waiting for the carbon source to be uniformly distributed; and (3) putting the prepared carbon source into the treatment pool according to the proportion of 60-70% of the total weight, and freely diffusing the carbon source in the treatment pool according to the water flow in the treatment pool.
S3, starting the treatment tank for aeration, and adding denitrifying strains after 5 hours of aeration; after the carbon source is diffused in the treatment tank, an aeration switch of the treatment tank is turned on to carry out aeration treatment on the sewage in the treatment tank, after 5 hours of aeration treatment, 60 percent of the total weight of the prepared denitrifying bacteria is scattered in the treatment tank, and aeration treatment is carried out again.
S4: aerating continuously for 12h, standing for 24h, and starting intermittent aeration; after the denitrifying bacteria are added, continuously starting an aeration switch of the treatment tank, carrying out continuous aeration treatment on the processor for 12 hours, standing for 24 hours after the aeration treatment is finished, and waiting for the comprehensive reaction of the denitrifying bacteria;
the intermittent aeration steps are as follows:
and standing for 24 hours, adding 5 percent of the total weight of the residual carbon source and 5 percent of the total weight of the denitrification strain, carrying out aeration treatment after the addition is finished, wherein the aeration treatment time is 3 hours, standing for 6 hours after the intermittent aeration treatment, and circularly carrying out the intermittent aeration treatment until the carbon source and the denitrification strain are all put into the treatment tank.
S5: sampling and detecting the content of nitrogen element; and after the aeration treatment is finished, randomly sampling the sewage in the treatment tank, testing the sample, detecting the total nitrogen amount in the sewage, discharging the sewage to perform subsequent treatment after meeting the standard, continuing the intermittent aeration treatment when not meeting the standard, wherein the intermittent aeration treatment time is 2 hours, and standing the sewage for 1 hour. And sampling the sewage subjected to secondary intermittent aeration treatment again until the total nitrogen content of the sewage is lower than a set value.
Example three:
the denitrification treatment process comprises the following steps:
s1: preparing a carbon source and denitrifying bacteria; the carbon source comprises 30% of straw crushed material, 10% of rotten wood crushed material, 7% of glucose, 15% of phosphorus source buffering agent and 38% of activated sludge; the component of the phosphorus source buffering agent is K 2 HPO 4 The device is used for providing a phosphorus source and is used as a buffering agent, wherein activated sludge is cleaned and centrifugally treated, and the granularity of the sludge is less than 0.1mm; the components of the denitrifying bacteria strain comprise 75% of denitrifying bacteria powder, 15% of methanol and 10% of ethanol, wherein the denitrifying bacteria powder is used for providing the denitrifying bacteria, and the methanol and the ethanol are used for providing carbon sources for supplementing the denitrifying bacteria to the denitrifying bacteria strain, so that the survival rate of the denitrifying bacteria is ensured.
S2: spreading a carbon source in the treatment pool, and waiting for the carbon source to be uniformly distributed; and (3) putting the prepared carbon source into a treatment pool according to the proportion of 70 percent of the total weight, and freely diffusing the carbon source in the treatment pool according to the water flow in the treatment pool.
S3, starting the treatment tank for aeration, and adding denitrifying strains after 7 hours of aeration; after the carbon source is diffused in the treatment tank, an aeration switch of the treatment tank is turned on, the sewage in the treatment tank is aerated, after 7 hours of aeration treatment, 70% of the total weight of the prepared denitrifying bacteria is sowed in the treatment tank, and aeration treatment is carried out again.
S4: continuously aerating for 16h, standing for 24h, and then starting intermittent aeration; after the denitrifying strains are added, continuously starting an aeration switch of the treatment tank, carrying out continuous aeration treatment on the processor for 16 hours, standing for 24 hours after the aeration treatment is finished, and waiting for the comprehensive reaction of the denitrifying strains;
the intermittent aeration steps are as follows:
standing for 24h, adding 10% of the total weight of the rest carbon source and 10% of the total weight of the rest denitrifying bacteria, carrying out aeration treatment after the addition is finished, wherein the aeration treatment time is 5h, standing for 12h after the intermittent aeration treatment, and circularly carrying out the intermittent aeration treatment until the carbon source and the denitrifying bacteria are all put into the treatment tank.
S5: sampling and detecting the content of nitrogen element; and after the aeration treatment is finished, randomly sampling the sewage in the treatment tank, testing the sample, detecting the total nitrogen amount in the sewage, discharging the sewage to perform subsequent treatment after meeting the standard, continuing the intermittent aeration treatment when not meeting the standard, wherein the intermittent aeration treatment time is 5 hours, and standing the sewage for 3 hours. And sampling the sewage subjected to secondary intermittent aeration treatment again until the total nitrogen content of the sewage is lower than a set value.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. A denitrification treatment process for removing total nitrogen in sewage is characterized in that: the denitrification treatment process comprises the following steps:
s1: preparing a carbon source and denitrifying strains;
s2: spreading a carbon source in the treatment pool, and waiting for the carbon source to be uniformly distributed;
s3, starting the treatment tank for aeration, and adding denitrifying strains after 5-7 hours of aeration;
s4: continuously aerating for 12-16h, standing for 24h, and starting intermittent aeration;
s5: sampling and detecting the content of nitrogen element.
2. The denitrification process for removing the total nitrogen in the sewage according to claim 1, wherein the denitrification process comprises the following steps: in S1 based on the denitrification treatment process step:
the carbon source comprises 25-30% of crushed straw, 5-10% of crushed rotten wood, 5-7% of glucose, 7-15% of phosphorus source buffering agent and 38-58% of activated sludge;
the component of the phosphorus source buffering agent is K 2 HPO 4 The phosphorus source is provided and the buffer agent is used, wherein the activated sludge is the sludge subjected to washing and centrifugal treatment, and the granularity of the sludge is less than 0.1mm.
3. The denitrification treatment process for removing the total nitrogen in the sewage according to claim 1, wherein the denitrification treatment process comprises the following steps: in S1 based on the denitrification treatment process step:
the denitrifying bacteria seed component comprises 70-75% of denitrifying bacteria powder, 10-15% of methanol and 10-20% of ethanol, wherein the denitrifying bacteria powder is used for providing the denitrifying bacteria, and the methanol and the ethanol are used for providing carbon sources for supplementing the denitrifying bacteria to the denitrifying bacteria seed so as to ensure the survival rate of the denitrifying bacteria.
4. The denitrification process for removing the total nitrogen in the sewage according to claim 1, wherein the denitrification process comprises the following steps: in S2 based on the denitrification treatment process step:
and (3) putting the prepared carbon source into the treatment pool according to the proportion of 60-70% of the total weight, and freely diffusing the carbon source in the treatment pool according to the water flow in the treatment pool.
5. The denitrification process for removing the total nitrogen in the sewage according to claim 1, wherein the denitrification process comprises the following steps: in S3 based on the denitrification treatment process step:
after the carbon source is diffused in the treatment tank, an aeration switch of the treatment tank is turned on, the sewage in the treatment tank is aerated, after 5-7 hours of aeration treatment, 60-70% of the total weight of the prepared denitrifying bacteria is scattered in the treatment tank, and aeration treatment is carried out again.
6. The denitrification process for removing the total nitrogen in the sewage according to claim 1, wherein the denitrification process comprises the following steps: in S4 based on the denitrification treatment process step:
after the denitrifying strains are added, continuously starting an aeration switch of the treatment tank, carrying out continuous aeration treatment on the processor for 12-16h, standing for 24h after the aeration treatment is finished, and waiting for the comprehensive reaction of the denitrifying strains;
the intermittent aeration steps are as follows:
standing for 24h, adding 5-10% of the total weight of the rest carbon source and 5-10% of the total weight of the rest denitrifying bacteria, carrying out aeration treatment after the addition is finished, wherein the aeration treatment time is 3-5h, standing for 6-12h after the intermittent aeration treatment, and circularly carrying out the intermittent aeration treatment until the carbon source and the denitrifying bacteria are all put into the treatment tank.
7. The denitrification process for removing the total nitrogen in the sewage according to claim 1, wherein the denitrification process comprises the following steps: in S5 based on the denitrification treatment process step:
and after the aeration treatment is finished, randomly sampling the sewage in the treatment tank, testing the sample, detecting the total nitrogen content in the sewage, discharging the sewage to perform subsequent treatment after meeting the standard, continuing the intermittent aeration treatment when not meeting the standard, wherein the intermittent aeration treatment time is 2-5h, and standing for 1-3h.
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