CN108408885B - Starting method for realizing semi-nitrosation in oxidation ditch at normal temperature - Google Patents
Starting method for realizing semi-nitrosation in oxidation ditch at normal temperature Download PDFInfo
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- CN108408885B CN108408885B CN201810306691.6A CN201810306691A CN108408885B CN 108408885 B CN108408885 B CN 108408885B CN 201810306691 A CN201810306691 A CN 201810306691A CN 108408885 B CN108408885 B CN 108408885B
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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
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1257—Oxidation ditches
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
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Abstract
The invention discloses a method for starting shortcut nitrification in an oxidation ditch at normal temperature. Adding prepared traditional nitrifying activated sludge into the oxidation ditch. The initial stage of the start of the oxidation ditch adopts an intermittent mode to operate, one operation period comprises 5 stages of water inlet, aeration plug flow reaction, sedimentation and drainage and idling, the aeration is carried out by changing the air quantity in different time periods, meanwhile, the bottom plug flow propulsion is assisted, and 1.5g/L of sodium chloride solution is added as an inhibitor to inhibit the growth of nitrite every day in the water inlet stage in the first ten days of the operation of the oxidation ditch; when the nitrosation rate in the oxidation ditch reaches 50%, the operation mode is changed into a continuous flow operation mode, the hydraulic retention time is controlled to be 12 h, and the start of normal-temperature short-cut nitrification is realized in the oxidation ditch after the operation for 33 days. The invention provides a method for quickly and efficiently starting shortcut nitrification at normal temperature, which solves the problems of slow starting time, harsh operating conditions and unstable treatment effect of the conventional shortcut nitrification reactor at normal temperature.
Description
Technical Field
The invention belongs to the technical field of biological treatment of wastewater, and particularly relates to a starting method for realizing shortcut nitrification in an oxidation ditch at normal temperature.
Background
At present, surface water eutrophication caused by nitrogen is increasingly serious, and urban sewage treatment plants are also faced with increasingly severe emission reduction pressure and upgrading modification requirements, but the traditional biological denitrification process has low total nitrogen removal rate and higher operating cost, so that the development of a novel efficient wastewater biological denitrification technology is reluctant.
The oxidation ditch process has the characteristics of simple process flow, convenient operation and management, good effluent quality, strong process reliability, low capital investment, low operating cost and the like, and is widely applied to urban domestic sewage treatment plants. However, with the continuous improvement of the requirement of environmental quality, the traditional oxidation ditch process reaches the first class A standard of pollutant emission Standard of municipal wastewater treatment plant (GB 18918-2002) and is difficult and the operation cost is increased.
The short-cut nitrification process is to convert ammonia nitrogen into nitrite and ensure that the nitrite is not further converted into nitrate, so that the oxygen demand can be reduced by about 25 percent compared with the whole-process nitrification, and the aeration energy consumption is saved; the sludge yield can be reduced by about 33-35%, and the sludge disposal cost is greatly reduced; in addition, the short-cut nitrification process can reduce about 40% of organic carbon sources in the subsequent denitrification reaction process, and reduce the operation energy consumption cost and the medicament cost. The technology has simple process and low capital construction and operation cost, can further reduce the operation cost while improving the treatment effect of the oxidation ditch process by combining the technology with the traditional oxidation ditch process, and has remarkable social, economic and environmental benefits.
However, the shortcut nitrification bacteria of the process are autotrophic bacteria and slow in growth, and the control key of the shortcut nitrification is to control the nitrification reaction to be in nitrosation degree with higher difficulty, so that the starting process of the process is slow, the process regulation is difficult, and the further application of the process is severely restricted. The invention provides a starting method for realizing short-cut nitrification in an oxidation ditch at normal temperature, and provides powerful technical support for the engineering popularization and application of the process.
Disclosure of Invention
The invention aims to provide a starting method for realizing short-cut nitrification in an oxidation ditch at normal temperature, and solves the problems of poor total nitrogen removal effect, high operation cost, slow start of short-cut nitrification and harsh operation conditions after the existing oxidation ditch process is upgraded and modified.
In order to achieve the purpose, the invention adopts the following technical scheme:
a starting method for realizing semi-nitrosation in an oxidation ditch at normal temperature comprises the following steps:
step 1: preparing a Carrousel oxidation ditch and traditional nitrification activated sludge;
step 2: adding prepared traditional nitrified activated sludge into a Carrousel oxidation ditch to enable the initial sludge concentration to be 3500 mg/L;
and step 3: the initial stage of the start-up of the oxidation ditch adopts an intermittent mode,operating one cycle every day, wherein one operating cycle comprises 1.5h of water inlet, 12 h of aeration plug flow reaction, 0.5h of sedimentation and 1h of water drainage and 5 idle stages, and the water drainage ratio is 2/5; in the water inlet stage, the inlet water is nitrogen-containing wastewater, the initial concentration of ammonia nitrogen inlet water is 110-; the pH value of the inlet water is 7.6-8.0, and the aeration rate is controlled to be 2-2.5m3H; in the aeration plug flow stage of the operation period, aeration with variable air volume at different time periods is adopted, and meanwhile, bottom plug flow propulsion is assisted; the reaction temperature is controlled at 18-25 ℃; in the first ten days of the operation of the oxidation ditch, 1.5g/L of sodium chloride solution is added as an inhibitor to inhibit the growth of nitrite bacteria in the water inlet stage every day; and when the nitrosation rate in the oxidation ditch reaches 50%, switching to a continuous flow operation mode, controlling the hydraulic retention time to be 12 h, judging that the start is successful when the nitrosation rate reaches 90%, and starting the normal-temperature short-cut nitrification in the oxidation ditch after the operation for 33 days.
The effective volume of the Carrousel oxidation ditch is 5.6 m3Two submersible stirrers are arranged in the oxidation ditch for plug flow, and the sludge concentration MLSS is controlled to be 3500 mg/L.
The aeration is carried out by time-interval variable air volume, and the aeration amount is 2 m at 23: 00-7: 00 night3H, aeration rate of 2.5m in the rest time3And/h, ensuring that DO in the reactor in the whole reaction period is 0.2 mg/L, and being beneficial to improving the short-cut nitrification effect.
The concentration of the potassium sulfate in the inlet water is maintained to be 1.5g/L, and the adding is continuously carried out for 10 days.
The temperature of the Carrousel oxidation ditch is controlled to be 18-25 ℃.
And after the nitrosation rate in the oxidation ditch reaches 50%, the oxidation ditch is switched to a continuous flow operation mode, and the hydraulic retention time is controlled to be 12 hours by continuous flow.
During the culture period, indexes such as COD, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, pH and the like in and out water can be monitored so as to master the starting process of the reactor.
The method maintains the concentration of potassium sulfate in the inlet water to be 1.5g/L for 10 consecutive days in the initial starting stage, utilizes the potassium sulfate with higher concentration to inhibit the activity of the traditional full-process nitrification, is favorable for rapidly screening the shortcut nitrifying bacteria, and accelerates the starting process of the shortcut nitrification.
In the reaction stage, the dissolved oxygen in the reactor is flexibly controlled by means of time-interval variable-air-volume aeration and bottom plug-flow propulsion assistance, so that the control of the short-cut nitrification process is facilitated, and the short-cut nitrification effect is improved.
The invention has the beneficial effects that:
(1) according to the invention, the concentration of potassium sulfate in the inlet water is maintained to be 1.5g/L for 10 consecutive days in the initial starting stage, the activity of the traditional full-process nitrification is inhibited by using potassium sulfate with higher concentration, the short-range nitrifying bacteria can be screened rapidly, and the starting process of the short-range nitrification is accelerated, so that the starting time of the reactor is greatly shortened, and the reactor can be started in 33 days.
(2) According to the invention, in the aeration plug flow stage, time-period variable-air-volume aeration is adopted, and simultaneously bottom plug flow propulsion is assisted, so that the flexible control of aeration quantity is realized, and meanwhile, the bottom plug flow promotes the complete mixing of flora microorganisms, thereby being beneficial to controlling the short-cut nitrification process and improving the short-cut nitrification effect.
Drawings
FIG. 1 is a diagram showing the ammonia nitrogen change during the starting process of a Carrousel oxidation ditch;
FIG. 2 is a graph showing the nitrite change during the starting process of the Carrousel oxidation ditch;
FIG. 3 is a graph showing the variation of nitrate during the start-up of the Carrousel oxidation ditch;
FIG. 4 is a graph showing the effect of nitrite accumulation during the start-up of the Carrousel oxidation ditch.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.
Example 1
Adding prepared traditional nitrified activated sludge into a Carrousel oxidation ditch in advance to control the initial sludge concentration to be 3500 mg/L; the oxidation ditch is made of stainless steel, the cross section size of the ditch is 0.3 m multiplied by 1.8 m (super high 0.3 m), the straight section length of the ditch is 2.5m, the total length is about 12.5 m, and the effective pool volume is about 5.6 m3. Two submersible stirrers are arranged in the ditch for flow pushing, and the aeration device adopts three electromagnetic blowers for aeration. The initial stage of the start of the oxidation ditch adopts an intermittent modeThe method comprises the following steps of operating one cycle every day, wherein one operating cycle comprises 1.5 hours of water inlet, 12 hours of aeration plug flow reaction, 0.5 hour of sedimentation and 1 hour of water drainage and 5 idle stages, and the water drainage ratio is about 2/5; in the water inlet stage, the inlet water is nitrogen-containing wastewater, the initial concentration of ammonia nitrogen inlet water is about 120 mg/L, and trace elements are added into the inlet water; the pH value of the inlet water is 7.6-8.0, and the aeration rate is controlled to be 2-2.5m3H; in the aeration plug flow stage of the operation period, aeration with variable air volume at different time periods is adopted, and meanwhile, bottom plug flow propulsion is assisted; the reaction temperature is controlled at 18-25 ℃; in the first ten days of the operation of the oxidation ditch, the concentration of potassium sulfate in the inlet water is maintained to be 1.5g/L every day, and the potassium sulfate is used as an inhibitor to inhibit the growth of nitrite bacteria; after 25 days of operation, the nitrosation rate in the oxidation ditch reaches 50 percent, the operation is switched into a continuous flow operation mode, the hydraulic retention time is controlled to be 12 hours, the nitrosation rate is stable to reach 90 percent, and the start of normal-temperature short-cut nitrification is realized in the oxidation ditch after 33 days of operation.
The reactor described in the present invention is a Carrousel oxidation ditch, but is equally suitable for other types of oxidation ditch reactors. According to the invention, after 33d of starting operation of the traditional nitrification activated sludge in the Carrousel oxidation ditch, the starting of the short-cut nitrification is successfully realized at normal temperature, and the starting time of the short-cut nitrification at normal temperature is effectively shortened (see figure 1). The method accelerates the screening and enrichment of functional flora in the reactor by reasonable parameter control, particularly by controlling aeration in different time periods and simultaneously adding potassium sulfate, so that the reactor is started successfully and rapidly.
Wherein, fig. 1, fig. 2, fig. 3 and fig. 4 respectively illustrate that the nitrosation rate is stabilized to 90% after the change of the accumulation rates of ammonia nitrogen, nitrite, nitrate and nitrite in the starting process of the Carrousel oxidation ditch is started and operated for 33d, so as to realize the starting of normal-temperature short-cut nitrification.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (1)
1. A starting method for realizing short-cut nitrification in an oxidation ditch at normal temperature is characterized by comprising the following steps: the method comprises the following steps:
step 1: preparing a Carrousel oxidation ditch and traditional nitrification activated sludge;
step 2: adding prepared traditional nitrified activated sludge into a Carrousel oxidation ditch to enable the initial sludge concentration to be 3500 mg/L;
and step 3: the initial stage of the start of the oxidation ditch adopts an intermittent mode to operate, and the operation is performed every day for one period, wherein one operation period comprises 1.5 hours of water inlet, 12 hours of aeration plug flow reaction, 0.5 hour of precipitation, 1 hour of water drainage and 5 idle stages, and the water drainage ratio is 2/5; in the water inlet stage, the inlet water is nitrogen-containing wastewater, the initial concentration of the inlet ammonia nitrogen is 110-120 mg/L, and trace elements are added into the inlet water; the pH value of the inlet water is 7.6-8.0; in the aeration plug flow stage of the operation period, aeration with variable air volume at different time periods is adopted, and simultaneously plug flow is carried out at the bottom; the reaction temperature is controlled at 18-25 ℃; in the first ten days of the operation of the oxidation ditch, potassium sulfate is added as an inhibitor to inhibit the growth of nitrite bacteria in the water inlet stage every day, and the concentration of potassium sulfate in the inlet water is maintained to be 1.5 g/L; when the nitrosation rate in the oxidation ditch reaches 50%, the operation is switched to a continuous flow operation mode, the hydraulic retention time is controlled to be 12 hours, the nitrosation rate reaches 90%, the start is considered to be successful, and the start of normal-temperature short-cut nitrification is realized in the oxidation ditch after the operation is carried out for 33 days; the time-interval variable-air-volume aeration specifically comprises the following steps: the aeration rate of 23: 00-7: 00 at night is 2 m3H, aeration rate of 2.5m in the rest time3The DO level in the reactor was made 0.2 mg/L throughout the reaction cycle.
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