CN113620505A - Device and method for realizing starting and maintaining of short-cut nitrification by alternately and laterally treating hydroxylamine and free nitrite - Google Patents
Device and method for realizing starting and maintaining of short-cut nitrification by alternately and laterally treating hydroxylamine and free nitrite Download PDFInfo
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Abstract
A device and a method for realizing the start and maintenance of short-cut nitrification by alternate side treatment of hydroxylamine and free nitrite belong to the field of sewage treatment. The related device is provided with: a raw water tank, a Sequencing Batch Reactor (SBR), a side treatment reactor and an automatic control system. The method comprises the following steps: after the full-process nitrification of the reactor is started, hydroxylamine with a certain concentration is added into a side reactor to treat sludge, the activity of Ammonia Oxidizing Bacteria (AOB) is promoted, Nitrospira in Nitrite Oxidizing Bacteria (NOB) is inhibited, and then the sludge is refluxed to a mainstream reactor in times, so that short-range nitrification is started; FNA is added into a side reactor, so that the effect of inhibiting the Nitrobacter is strong, and the short-range nitrification is consolidated; and in the later stage, the long-term maintenance of the short-cut nitrification is realized by alternately adding hydroxylamine and FNA. The invention can start short-cut nitrification, has high nitrite accumulation rate and can keep running for a longer time. Has the advantages of quick start, long-term nitrite supply, and the like.
Description
Technical Field
The invention relates to a device and a method for realizing the starting and the maintaining of short-cut nitrification by alternate side treatment of hydroxylamine and nitrite, which belong to the field of biological sewage treatment and are suitable for biological denitrification of urban domestic sewage, in particular to the application of short-cut nitrification related processes.
Background
In the process of treating urban domestic sewage, because the carbon-nitrogen ratio in the urban domestic sewage is low, and the denitrification is incomplete easily due to insufficient carbon source in the whole-course nitrification-denitrification technology, and the denitrification efficiency is influenced, the carbon source is usually required to be additionally added, and the whole-course nitrification needs long-time aeration, so that the energy consumption is relatively large, and the requirement of sustainable development is not met.
Short-cut nitration is a promising process. The short-cut nitrification is only under the action of Ammonia Oxidizing Bacteria (AOB)
Oxidation to
The reaction can achieve the purposes of reducing aeration quantity and saving energy consumption. And produced by short-cut nitrification
Can be used as a substrate of short-cut denitrification or anaerobic ammonium oxidation reaction, and can save resources to a certain extent.
However, the initiation and maintenance of the shortcut nitrification are a bottleneck, and in the past experience, the inhibition of NOB can be realized by controlling sludge age (SRT), controlling Dissolved Oxygen (DO), and adding inhibitors (FA, FNA, hydroxylamine and the like) into main streams, so that the nitrite is accumulated, but the problems of AOB inhibition caused by inhibitor toxicity, NOB adaptability to the inhibitor and the like still exist in the method. Therefore, how to realize the starting and the maintaining of the short-cut nitrification is a problem to be solved.
According to previous researches, the main stream of hydroxylamine and FNA has strong inhibition effect on Nitrospira and Nitrobacter in NOB, but because both of the hydroxylamine and the FNA are reversible inhibition, the long-term maintenance cannot be realized by singly adding one. At the same time, the AOB is affected by the higher concentration of hydroxylamine and FNA, and the cost of hydroxylamine is high, so a new method is needed to maintain the short-cut nitrification operation.
Disclosure of Invention
The invention provides a method for alternative side treatment by side adding hydroxylamine hydrochloride and FNA, which can effectively inhibit main flora Nitrospira and Nitrobacter in NOB and realize the maintenance of short-range nitrification. The method has the advantages of low cost, good effect, lasting maintenance and simple operation, and can provide reference for the starting and maintenance of the short-cut nitrification.
A device for realizing the starting and maintaining of short-cut nitrification by adding hydroxylamine and FNA for alternative side treatment is characterized by comprising: the system comprises a raw water tank (1), a raw water inlet pump (1.1), a Sequencing Batch Reactor (SBR) (2), an SBR stirrer (2.1), an aeration pump (2.2), a flowmeter (2.3), an aeration disc (2.4), a pH probe (2.5), a Dissolved Oxygen (DO) probe (2.6), a drainage valve (2.7), a sludge discharge valve (2.8), a sludge storage device (3), a sludge storage device stirrer (3.1), a sludge discharge pump (3.2), a hydroxylamine/FNA side treatment device (4), a side treatment stirrer (4.1), a sludge reflux pump (4.2), an aeration probe (4.3), a hydroxylamine medicine storage barrel (5), a medicine feeding pump (5.1), a FNA medicine storage barrel (6), a medicine feeding pump (6.1), a water outlet pool (7), a programmable control system (8) and a computer (9);
the raw water tank (1) is connected with the water inlet end of the SBR (2) through a raw water inlet pump (1.1); the SBR (2) is provided with an SBR stirrer (2.1), an aeration pump (2.2), a flow meter (2.3), an aeration disc (2.4), a pH probe (2.5), a DO probe (2.6), a drainage valve (2.7) and a sludge discharge valve (2.8), and the drainage end of the SBR (2) is connected with the water inlet end of the water outlet pool (7) through the drainage valve (2.7); the sludge discharging end of the SBR (2) is connected with the sludge storage device (3) through a sludge discharging valve (2.8); the sludge storage device (3) consists of a stirrer (3.1) and a sludge discharge pump (3.2), and a sludge discharge end is connected with the hydroxylamine/FNA side processing device (4) through the sludge discharge pump (3.2); the sludge discharge end of the hydroxylamine/FNA side treatment device (4) is connected with SBR through a sludge reflux pump (4.2); the hydroxylamine/FNA side treatment device (4) consists of a side treatment stirrer (4.1), a sludge reflux pump (4.2) and an aeration probe (4.3), and a hydroxylamine storage barrel (5) is connected with the water inlet end of the hydroxylamine/FNA side treatment device (4) through a dosing pump (5.1); the FNA medicine storage barrel (6) is connected with the water inlet end of the hydroxylamine/FNA side treatment device (4) through a medicine adding pump (6.1); the built-in interface of the programmable control system (8) is respectively connected with a raw water inlet pump (1.2), an SBR stirring device (2.1), an aeration pump (2.2), a water discharge valve (2.7), a sludge discharge valve (2.8) and a computer (9).
The method for realizing the starting and the maintaining of the short-cut nitrification based on the alternate side treatment of hydroxylamine feeding and FNA by using the device of claim 1 is characterized by comprising the following steps:
1) starting the whole nitrification process: injecting full-course nitrified sludge of an actual urban sewage treatment plant into SBR (2) as inoculation sludge, wherein the concentration is 3000-5000 mg/L; using artificially synthesized wastewater as raw water and initial NH4 +The concentration of N is 40-60mg/L, and the SBR is injected by a raw water inlet pump (1.2), and the water inlet time is 5 min; operating an SBR stirring device (2.1) to realize the full mixing of mud and liquid, wherein the stirring time is 10 min; starting an aeration pump (2.2) to aerate the domestic sewage for 60min, keeping DO at 1-2mg/L and keeping the pH value at 6.5-8.5; then precipitating for 30min, draining for 5min, wherein the drainage ratio of SBR is 0.3-0.5, and discharging supernatant into a water outlet pool (7); the reactor was operated for 6 cycles per day with 130min idle time for each cycle; when the ammoxidation rate reaches more than 90 percent and is maintained for more than 10 days, the whole course nitrification of the municipal domestic sewage is considered to be completed in the SBR for starting;
2) starting short-cut nitrification: the hydroxylamine side treatment was started first, specifically as follows: adding sludge discharge treatment in the last 5min of the aeration period in the operation mode of feeding water for 5min, stirring for 10min, aerating for 60min, precipitating for 30min, discharging water for 5min and leaving unused for 130min, and discharging 10-15% of the volume of the mixed liquid in the SBR into the sludge storage device (3) through the sludge discharge device (2.8) in each period; after 6 periods of the day, sludge in the sludge discharge device (2.8) is concentrated to 50% of the original volume and is pumped into a hydroxylamine/FNA side treatment device (4); adding hydroxylamine solution into a hydroxylamine/FNA side treatment device (4) according to a certain proportion through a dosing pump (5.1) to ensure that the concentration of hydroxylamine in the added mixed solution is 5-10mg/L, and fully mixing for 4-24h under the action of a side treatment stirrer (4.1) and an aeration probe (4.3); on the next day, mixed liquor with the volume of 15% in the hydroxylamine/FNA side treatment device (4) enters SBR (2) through a sludge reflux pump (4.2) and raw water at the same time in each cycle of water inlet stage, and the subsequent reaction is carried out after the cycle. Until the accumulation rate of nitrite in effluent reaches more than 80%, the initiation of short-cut nitrification is considered to be successful;
3) short-cut nitrification maintenance: continuing to perform hydroxylamine side treatment for 10-15 days after the short-cut nitrification is successfully started, stopping the hydroxylamine side treatment, and starting FNA side treatment, which specifically comprises the following steps: the operation is carried out according to the steps of feeding water for 5min, stirring for 10min, aerating for 60min, precipitating for 30min, draining for 5min and leaving unused for 130min in each period, sludge is drained in the last 5min of the aeration period, and 10-15% of the volume of the mixed liquid in the SBR is drained in each period through a sludge drainage device (2.8) and enters a sludge storage device (3); after 6 periods of the day, sludge in the sludge discharge device (2.8) is concentrated to 50% of the original volume and is pumped into a hydroxylamine/FNA side treatment device (4); the FNA solution is added into a hydroxylamine/FNA side treatment device (4) according to a certain proportion through a dosing pump (5.1), so that the FNA concentration in the added mixed solution is 5-10mg/L, and the mixed solution is fully mixed for 4-24 hours under the action of a side treatment stirrer (4.1) and an aeration probe (4.3); on the next day, mixed liquor with the volume of 15 percent in the hydroxylamine/FNA side treatment device (4) enters SBR (2) through a sludge reflux pump (4.2) and raw water at the same time in each cycle of water inlet stage, and the subsequent reaction is carried out after the cycle; the subsequent treatment is carried out alternately in a mode of hydroxylamine side treatment for 10-15 days and FNA side treatment for 10-15 days.
In summary, the provided device and method for realizing the start and maintenance of shortcut nitrification based on hydroxylamine and FNA sludge side alternate treatment comprises the following processes: sewage enters the SBR through a water inlet device, part of mixed liquid discharged at the end of an aeration stage enters a sludge storage device, the mixed liquid enters a hydroxylamine/FNA treatment device after 6 periods of the day, firstly, hydroxylamine is added to inhibit the reproduction and activity of NOB, short-range nitrification is started, hydroxylamine treatment is stopped after 10-15 days of consolidation, FNA side treatment is started again, and FNA10-15 days are added to maintain a high nitrite accumulation rate.
Compared with the prior art, the invention has the following advantages:
(1) can establish stable short-cut nitrification in a shorter time, and has higher nitrite accumulation;
(2) side treatment, which has less inhibition on AOB in the reactor and reduces the cost;
(3) the alternate treatment mode can effectively inhibit NOB and maintain short-cut nitrification for a longer time.
Description of the drawings:
FIG. 1 is a diagram of the apparatus of the present invention:
1 represents a raw water tank, and 1.1 represents a raw water intake pump; 2 a Sequencing Batch Reactor (SBR), 2.1 an SBR stirrer, 2.2 an aeration pump, 2.3 a flow meter, 2.4 an aeration tray, 2.5 a pH probe, 2.6 a Dissolved Oxygen (DO) probe, 2.7 a drain valve, and 2.8 a sludge discharge valve; 3 denotes a sludge storage device, 3.1 denotes a sludge storage device stirrer, and 3.2 denotes a sludge discharge pump; 4 represents a hydroxylamine/FNA side treatment device, 4.1 represents a side treatment stirrer, 4.2 represents a sludge reflux pump, and 4.3 represents an aeration probe; 5 represents a hydroxylamine storage barrel, 5.1 represents a dosing pump; 6 denotes FNA medicine storage barrel, 6.1 denotes a medicine adding pump; 7 denotes the effluent sump; 8 denotes a programmable control system; and 9 denotes a computer.
The specific implementation mode is as follows:
referring to the test device shown in FIG. 1, the short-cut nitrification for maintaining the long-term stability of the municipal sewage is carried out according to the following steps:
1) starting the whole nitrification process: injecting full-course nitrified sludge of an actual urban sewage treatment plant into SBR (2) as inoculation sludge, wherein the concentration is 3000-5000 mg/L; using artificially synthesized wastewater as raw water and initial NH4 +The concentration of N is 40-60mg/L, and the SBR is injected by a raw water inlet pump (1.2), and the water inlet time is 5 min; operating an SBR stirring device (2.1) to realize the full mixing of mud and liquid, wherein the stirring time is 10 min; starting an aeration pump (2.2) to aerate the domestic sewage for 60min, keeping DO at 1-2mg/L and keeping the pH value at 6.5-8.5; then precipitating for 30min, draining for 5min, wherein the drainage ratio of SBR is 0.3-0.5, and discharging supernatant into a water outlet pool (7); the reactor was operated for 6 cycles per day with 130min idle time for each cycle; when the ammoxidation rate reaches more than 90 percent and is maintained for more than 10 days, the whole course nitrification of the municipal domestic sewage is considered to be completed in the SBR for starting;
2) starting short-cut nitrification: the hydroxylamine side treatment was started first, specifically as follows: adding sludge discharge treatment in the last 5min of the aeration period in the operation mode of feeding water for 5min, stirring for 10min, aerating for 60min, precipitating for 30min, discharging water for 5min and leaving unused for 130min, and discharging 10-15% of the volume of the mixed liquid in the SBR into the sludge storage device (3) through the sludge discharge device (2.8) in each period; after 6 periods of the day, sludge in the sludge discharge device (2.8) is concentrated to 50% of the original volume and is pumped into a hydroxylamine/FNA side treatment device (4); adding hydroxylamine solution into a hydroxylamine/FNA side treatment device (4) according to a certain proportion through a dosing pump (5.1) to ensure that the concentration of hydroxylamine in the added mixed solution is 5-10mg/L, and fully mixing for 4-24h under the action of a side treatment stirrer (4.1) and an aeration probe (4.3); on the next day, mixed liquor with the volume of 15% in the hydroxylamine/FNA side treatment device (4) enters SBR (2) through a sludge reflux pump (4.2) and raw water at the same time in each cycle of water inlet stage, and the subsequent reaction is carried out after the cycle. Until the accumulation rate of nitrite in effluent reaches more than 80%, the initiation of short-cut nitrification is considered to be successful;
3) short-cut nitrification maintenance: continuing to perform hydroxylamine side treatment for 10-15 days after the short-cut nitrification is successfully started, stopping the hydroxylamine side treatment, and starting FNA side treatment, which specifically comprises the following steps: the operation is carried out according to the steps of feeding water for 5min, stirring for 10min, aerating for 60min, precipitating for 30min, draining for 5min and leaving unused for 130min in each period, sludge is drained in the last 5min of the aeration period, and 10-15% of the volume of the mixed liquid in the SBR is drained in each period through a sludge drainage device (2.8) and enters a sludge storage device (3); after 6 periods of the day, sludge in the sludge discharge device (2.8) is concentrated to 50% of the original volume and is pumped into a hydroxylamine/FNA side treatment device (4); the FNA solution is added into a hydroxylamine/FNA side treatment device (4) according to a certain proportion through a dosing pump (5.1), so that the FNA concentration in the added mixed solution is 5-10mg/L, and the mixed solution is fully mixed for 4-24 hours under the action of a side treatment stirrer (4.1) and an aeration probe (4.3); on the next day, mixed liquor with the volume of 15 percent in the hydroxylamine/FNA side treatment device (4) enters SBR (2) through a sludge reflux pump (4.2) and raw water at the same time in each cycle of water inlet stage, and the subsequent reaction is carried out after the cycle; the subsequent treatment is carried out alternately in a mode of hydroxylamine side treatment for 10-15 days and FNA side treatment for 10-15 days.
Claims (2)
1. A device for realizing the starting and maintaining of short-cut nitrification by adding hydroxylamine and FNA for alternative side treatment is characterized by comprising: the system comprises a raw water tank (1), a raw water inlet pump (1.1), a Sequencing Batch Reactor (SBR) (2), an SBR stirrer (2.1), an aeration pump (2.2), a flowmeter (2.3), an aeration disc (2.4), a pH probe (2.5), a Dissolved Oxygen (DO) probe (2.6), a drainage valve (2.7), a sludge discharge valve (2.8), a sludge storage device (3), a sludge storage device stirrer (3.1), a sludge discharge pump (3.2), a hydroxylamine/FNA side treatment device (4), a side treatment stirrer (4.1), a sludge reflux pump (4.2), an aeration probe (4.3), a hydroxylamine medicine storage barrel (5), a medicine feeding pump (5.1), a FNA medicine storage barrel (6), a medicine feeding pump (6.1), a water outlet pool (7), a programmable control system (8) and a computer (9);
the raw water tank (1) is connected with the water inlet end of the SBR (2) through a raw water inlet pump (1.1); the SBR (2) is provided with an SBR stirrer (2.1), an aeration pump (2.2), a flowmeter (2.3), an aeration disc (2.4), a pH probe (2.5), a DO probe (2.6), a drainage valve (2.7) and a sludge discharge valve (2.8), and the drainage end of the SBR (2) is connected with the water inlet end of the water outlet pool (7) through the drainage valve (2.7); the sludge discharging end of the SBR (2) is connected with the sludge storage device (3) through a sludge discharging valve (2.8); the sludge storage device (3) consists of a stirrer (3.1) and a sludge discharge pump (3.2), and a sludge discharge end is connected with the hydroxylamine/FNA side processing device (4) through the sludge discharge pump (3.2); the sludge discharge end of the hydroxylamine/FNA side treatment device (4) is connected with SBR through a sludge reflux pump (4.2); the hydroxylamine/FNA side treatment device (4) consists of a side treatment stirrer (4.1), a sludge reflux pump (4.2) and an aeration probe (4.3), and a hydroxylamine storage barrel (5) is connected with the water inlet end of the hydroxylamine/FNA side treatment device (4) through a dosing pump (5.1); the FNA medicine storage barrel (6) is connected with the water inlet end of the hydroxylamine/FNA side treatment device (4) through a medicine adding pump (6.1); the built-in interface of the programmable control system (8) is respectively connected with a raw water inlet pump (1.2), an SBR stirring device (2.1), an aeration pump (2.2), a water discharge valve (2.7), a sludge discharge valve (2.8) and a computer (9).
2. The method for starting and maintaining the shortcut nitrification by using the device of claim 1 to carry out alternate side treatment of hydroxylamine feeding and FNA, is characterized by comprising the following steps:
1) injecting full-course nitrified sludge of an actual urban sewage treatment plant into SBR (2) as inoculation sludge, wherein the concentration is 3000-5000 mg/L;
2) starting the whole nitrification process: using artificially synthesized wastewater as raw water and initial NH4 +The concentration of N is 40-60mg/L, and the SBR is injected by a raw water inlet pump (1.2), and the water inlet time is 5 min; operating an SBR stirring device (2.1) to realize the full mixing of mud and liquid, wherein the stirring time is 10 min; starting an aeration pump (2.2) to aerate the domestic sewage for 60min, keeping DO at 1-2mg/L and keeping the pH value at 6.5-8.5; then precipitating for 30min, draining for 5min, wherein the drainage ratio of SBR is 0.3-0.5, and discharging supernatant into a water outlet pool (7); the reactor operates for 6 cycles every day, each cycle has idle time of 130min, and when the ammoxidation rate reaches more than 90 percent and is maintained for more than 10 days, the whole course nitrification of the municipal domestic sewage is considered to be finished in the SBR to start;
3) starting short-cut nitrification: the hydroxylamine side treatment was started first, specifically as follows: adding sludge discharge treatment in the last 5min of the aeration period in the operation mode of feeding water for 5min, stirring for 10min, aerating for 60min, precipitating for 30min, discharging water for 5min and leaving unused for 130min, and discharging 10-15% of the volume of the mixed liquid in the SBR into the sludge storage device (3) through the sludge discharge device (2.8) in each period; after 6 periods of the day, sludge in the sludge discharge device (2.8) is concentrated to 50% of the original volume and is pumped into a hydroxylamine/FNA side treatment device (4); adding hydroxylamine solution into a hydroxylamine/FNA side treatment device (4) according to a certain proportion through a dosing pump (5.1) to ensure that the concentration of hydroxylamine in the added mixed solution is 5-10mg/L, and fully mixing for 4-24h under the action of a side treatment stirrer (4.1) and an aeration probe (4.3); on the next day, mixed liquor with the volume of 15 percent in the hydroxylamine/FNA side treatment device (4) enters SBR (2) through a sludge reflux pump (4.2) and raw water at the same time in each cycle of water inlet stage, and the subsequent reaction is carried out after the cycle; until the accumulation rate of nitrite in effluent reaches more than 80%, the initiation of short-cut nitrification is considered to be successful;
4) short-cut nitrification maintenance: continuing to perform hydroxylamine side treatment for 10-15 days after the short-cut nitrification is successfully started, stopping the hydroxylamine side treatment, and starting FNA side treatment, which specifically comprises the following steps: the operation is carried out according to the steps of feeding water for 5min, stirring for 10min, aerating for 60min, precipitating for 30min, draining for 5min and leaving unused for 130min in each period, sludge is drained in the last 5min of the aeration period, and 10-15% of the volume of the mixed liquid in the SBR is drained in each period through a sludge drainage device (2.8) and enters a sludge storage device (3); after 6 periods of the day, sludge in the sludge discharge device (2.8) is concentrated to 50% of the original volume and is pumped into a hydroxylamine/FNA side treatment device (4); the FNA solution is added into a hydroxylamine/FNA side treatment device (4) according to a certain proportion through a dosing pump (5.1), so that the FNA concentration in the added mixed solution is 5-10mg/L, and the mixed solution is fully mixed for 4-24 hours under the action of a side treatment stirrer (4.1) and an aeration probe (4.3); on the next day, mixed liquor with the volume of 15 percent in the hydroxylamine/FNA side treatment device (4) enters SBR (2) through a sludge reflux pump (4.2) and raw water at the same time in each cycle of water inlet stage, and the subsequent reaction is carried out after the cycle; the subsequent treatment is carried out alternately in a mode of hydroxylamine side treatment for 10-15 days and FNA side treatment for 10-15 days.
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| CN102417238A (en) * | 2011-10-18 | 2012-04-18 | 大连理工大学 | Culture method of short-cut nitrification and denitrification granular sludge |
| CN106865773A (en) * | 2017-04-07 | 2017-06-20 | 北京工业大学 | Add the apparatus and method that azanol realizes part short distance nitration Anammox |
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