CN113003714B - Method for realizing rapid accumulation of nitrous based on membrane separation circulating inlet water - Google Patents
Method for realizing rapid accumulation of nitrous based on membrane separation circulating inlet water Download PDFInfo
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- CN113003714B CN113003714B CN202110398673.7A CN202110398673A CN113003714B CN 113003714 B CN113003714 B CN 113003714B CN 202110398673 A CN202110398673 A CN 202110398673A CN 113003714 B CN113003714 B CN 113003714B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
- C02F3/1268—Membrane bioreactor systems
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- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
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Abstract
The invention discloses a method for realizing rapid accumulation of nitrous oxide based on membrane separation circulating inlet water, belonging to the technology of nitrogenous sewage treatment in the field of environmental protection. The invention combines the circulating water inlet with the membrane separation and is used for realizing the rapid accumulation of the nitrous in the sewage denitrification treatment process. Functional enzymes and quorum sensing signal molecules in the circulating inlet water can slow down the impact on nitrosobacteria, and efficiently inhibit nitrobacteria, so that the oxidation of ammonia nitrogen is stopped at the stage of nitrite. The method for realizing the rapid accumulation of the nitrous oxide based on the membrane separation circulating influent water has the advantages of simple operation, low operation cost, small occupied area, short start-up period, wide application range, stable operation and the like, and stable nitrous oxide accumulation can be realized after the circulating influent water is circulated for 4 days by adopting the method. Provides a method for quickly starting a sewage plant adopting a short-cut nitrification related process.
Description
Technical Field
The invention belongs to the fields of nitrogenous sewage treatment technology and environmental protection, and particularly relates to a method for realizing rapid accumulation of nitrite based on membrane separation circulating influent water, which is suitable for sewage treatment plants which are supposed to adopt a short-cut nitrification process.
Background
At present, the problem of water eutrophication in China is still outstanding, the discharge of nitrogen-containing organic matters in industrial wastewater is high, and the water treatment situation is severe.
The short-cut nitrification is to convert ammonia nitrogen into nitrite under the action of ammonia oxidizing bacteria, so that the nitrification reaction is limited in the nitrite stage, and the stable accumulation of the nitrite is realized. The process has the advantages of saving carbon source, aeration amount, reaction time and the like, can save treatment cost, and brings good economic benefit to enterprises. The key to achieving short-cut nitrification is the constant accumulation of nitrite, which requires inhibition of nitrite-oxidizing bacteria while ensuring the activity and growth of ammonia-oxidizing bacteria. The control of temperature, pH, dissolved oxygen and the like can inhibit the activity of nitrosobacteria, so that ammonia oxidizing bacteria become dominant bacteria, and short-cut nitrification is realized.
The short-cut nitration is used as a pre-reaction of other processes and plays a vital role. Compared with the traditional denitrification process, the short-cut nitrification and denitrification process shortens the step of mutual conversion of nitrite and nitrate, saves the reaction time, improves the denitrification rate, and is increasingly emphasized in the field of sewage treatment. The control key of the shortcut nitrification which is used as a pre-reaction of the anaerobic ammonia oxidation process is to oxidize about 60 percent of ammonia nitrogen in the inlet water into nitrite nitrogen and inhibit the ammonia nitrogen from being further oxidized into nitrate nitrogen. In addition, the short-cut nitrification process can be coupled with a sulfur autotrophic denitrification process, and sulfur autotrophic denitrification bacteria utilize inorganic carbon sources and take various sulfides such as elemental sulfur, sulfide, thiosulfate and the like as electron donors for reduction of nitrite, so that synchronous denitrification and sulfur removal can be realized, and the short-cut nitrification process becomes a hot spot of the current sewage treatment.
The key of the short-cut nitrification is to realize the rapid and stable accumulation of the nitrite in the reactor. The membrane bioreactor is a wastewater treatment technology combining membrane separation and biological treatment, and has significant advantages for realizing the accumulation of the nitrous oxides. The cyclic water inflow and membrane bioreactor is applied to short-cut nitrification in sewage treatment, so that impact of overhigh ammonia nitrogen concentration on the reactor can be relieved, stable operation of the reactor under high concentration is ensured, enrichment of ammonia oxidizing bacteria is promoted, and quick start of short-cut nitrification is realized.
The effect of shortcut nitrification is generally evaluated in terms of the accumulation rate of nitrite. The calculation method is the ratio of the generation amount of the nitrous in the reaction effluent to the sum of the generation amounts of the nitrous and the nitric nitrogen. Therefore, the nitrous accumulation rate is adopted to evaluate whether the rapid starting of the short-cut nitrification process by utilizing the circulating influent water and the membrane bioreactor is successful.
At present, how to stably and quickly realize the short-cut nitrification process is a big problem, and the method of quickly starting the short-cut nitrification process by utilizing circulating water flow and a membrane bioreactor improves the problem, can further expand the application range of the short-cut nitrification process and improve the benefit of enterprises.
Disclosure of Invention
The invention provides a method for realizing rapid accumulation of nitrite based on membrane separation circulating influent, aiming at solving the problems of long starting shortcut nitrification period, unstable effect and the like faced by the current sewage treatment. The method comprises the following specific steps:
(1) Nitrifying sludge is inoculated in the membrane bioreactor, the concentration is 7-10 g/L, the sludge volume accounts for 20% -30% of the effective volume of the membrane bioreactor, the ammonia nitrogen of inlet water is controlled to be more than 150 mg/L, the alkalinity of inlet water/ammonia nitrogen is controlled to be more than 5, the aeration rate/ammonia nitrogen is controlled to be 0.5 to 1 (L/min)/(mg/L), the ammonia nitrogen/HRT is controlled to be 0.025-0.035 g/(L.h), and the operation is carried out for 5-7 days so as to ensure that the sludge is adaptive to a new environment, and autotrophic bacteria are screened and heterotrophic bacteria die;
(2) Then, water is circulated, the outlet water filtered by the membrane module flows into the water inlet bucket, is uniformly mixed with the inlet water, and continuously flows into the membrane bioreactor as the inlet water again. Continuously operating in such a way, not supplementing a substrate in the process, measuring inlet and outlet water every day, and finishing a period when the concentration of ammonia nitrogen in the outlet water is reduced to be below 100 mg/L; then, replacing the inlet water with the original water distribution (inlet ammonia nitrogen is more than 150 mg/L, and inlet alkalinity/ammonia nitrogen is more than 5), continuously circularly feeding water to finish the next period, and finishing the first stage of circularly feeding water when the running time of the three continuous periods is less than or equal to 1 day, wherein the nitrite accumulation rate can reach more than 80%;
(3) Continuously adopting circulating inflow, when the ammonia nitrogen of the effluent is reduced to be below 50 mg/L, ending one period, replacing the inflow with the original water distribution (the ammonia nitrogen of the inflow is more than 150 mg/L, and the alkalinity of the inflow/the ammonia nitrogen is more than 5), and ending the second stage of circulating inflow when the running time of three continuous periods is less than or equal to 2 days, wherein the accumulation rate of the nitrite is maintained to be more than 90%;
(4) And (3) stopping circulating water inflow, changing the operation mode of the reactor into continuous water inflow and outflow, continuously controlling the ammonia nitrogen of the inflow water to be more than 150 mg/L, the alkalinity of the inflow water to be more than 5, the aeration rate/ammonia nitrogen to be between 0.5 and 1 (L/min)/(mg/L), the ammonia nitrogen/HRT to be between 0.025 and 0.035 g/(L.h), and continuously stabilizing the nitrite accumulation rate to be more than 95 percent.
The beneficial effects of the invention are: 1. the process provides a method for realizing the rapid accumulation of the nitrous oxide based on membrane separation circulating inlet water: the method has the advantages of simple operation, low operation cost and small occupied area.
2. The process has short starting period: the realization of short-cut nitrification under normal conditions generally requires about 30 days to realize relatively stable nitrite accumulation rate, while the invention adopts a circulating water feeding method to quickly realize relatively stable nitrite accumulation rate in only 3 days. Due to the circular water inlet, on one hand, the impact of impurities in water on the sludge of the reactor is reduced, and the stability of the system is rapidly improved; on the other hand, the effluent has signal molecules in the reactor, which is beneficial to the active expression of the sludge. Therefore, the start-up time is greatly shortened, and the denitrification efficiency is improved.
3. The process can be suitable for high ammonia nitrogen wastewater: the impact of overhigh ammonia nitrogen concentration on the sludge of the reactor can be relieved firstly by adopting circulating inflow water; and secondly, the effluent of the reactor contains certain biological enzymes, so that the enrichment of ammonia oxidizing bacteria can be promoted, the stable operation of the reactor under high concentration is further ensured, and the quick start of the short-cut nitrification is realized.
4. The process has stable performance: after the start-up is successful, the water is adjusted to be continuously fed in and discharged out, the accumulation rate of nitrite is basically not influenced, and the stable operation of the reactor is indicated.
Drawings
FIG. 1 is a diagram of an operating apparatus for a membrane bioreactor in accordance with the present invention.
Fig. 2 is a graph of the change in triple nitrogen and the accumulation rate of nitrite in the start-up process of shortcut nitrification in the practice of the present invention, wherein the accumulation rate of nitrite (%) = 100% nitrite/(nitrite + nitrate).
In fig. 1: 1-emptying the pipe; 2, a water inlet bucket; 3, a water inlet pump; 4-a water inlet; 5-DO, pH on-line detector; 6-a liquid level meter; 7-a stirrer; 8-an aeration ring; 9-a membrane module; 10-an air pump; 11-pressure gauge; 12-water outlet pump.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given the full breadth of the appended claims and any and all insubstantial modifications and variations thereof which can be made by one skilled in the art based on the teachings of the invention as described above.
Referring to FIG. 1, this example first details an apparatus for rapid nitrite accumulation using membrane separation recycle feed water. The reactor adopted in the invention is a membrane bioreactor, the effective volume of the reactor is 4.5L, and a polyvinylidene fluoride (PVDF) hollow fiber membrane component is arranged in the reactor. The bottom of the reactor is provided with an aeration device, and the DO concentration in the wastewater of the reactor can be controlled by adjusting the aeration quantity. The stirrer is arranged in the water tank, so that the muddy water is uniformly mixed, the water inlet pump is connected with the liquid level controller, the liquid level is kept constant, and the discharged water is pumped out through the water outlet pump and then circulated to the water inlet barrel.
The specific treatment is as follows:
inoculating 1L of nitrified sludge taken back from a sewage treatment plant, wherein the sludge concentration in the inoculated reactor is 7.38 g/L, and the sludge volume accounts for 22 percent of the effective volume of the membrane bioreactor. Under the conditions that the temperature is normal temperature, the pH is about 8, the DO is about 0.2mg/L and the hydraulic retention time is 8 h, the ammonia nitrogen of the feed water is 200 mg/L. The experimental simulation sewage is used as the test water, and the water inlet substrate mainly comprises 0.94g/L (NH) 4 ) 2 SO 4 2.69g/L NaHCO 3 While adding 0.068g/L CaCl 2 0.15g/L MgSO 4 ·H 2 O、0.068g/KH of L 2 PO 4 。
And (4) operating for 7 days according to the mode, changing the reactor into circulating inlet water after the sludge is adapted to a new environment, simultaneously controlling the ammonia nitrogen concentration, the temperature, the pH value and the DO of the inlet water to be unchanged, continuously operating the reactor, measuring the change data of ammonia nitrogen, nitrite and nitrate nitrogen in the reactor every day, and calculating the nitrite accumulation rate so as to observe the operating condition of the reactor in real time. The specific implementation scheme is as follows:
(1) Firstly, experimental simulation sewage enters a membrane bioreactor from a water inlet barrel under the action of a water inlet pump, and the concentration of inlet ammonia nitrogen is 200 mg/L;
(2) Mixing the experimental simulation sewage with the inoculated sludge in the membrane bioreactor, and running for 7 days in this way to recover the activity of the sludge and start short-cut nitrification;
(3) The effluent after reaction is filtered by a membrane module through an effluent pump and then flows out, the effluent is uniformly mixed with the inlet water in the inlet water tank and then is recycled to the inlet water tank, the operation is continued in the same way, ammonia nitrogen and alkalinity are not added in the process, when the concentration of the ammonia nitrogen in the effluent is reduced to be below 100mg/L, the inlet water is replaced by the original water distribution, the circulation of the next period is continuously completed by circulating the inlet water, the operation time is continued for three continuous periods in the way until the operation time is less than or equal to 1 day, and the accumulation rate of the nitrite can reach more than 80 percent, the first stage is proved to be finished, and the shortcut nitrification is successfully started;
(4) Continuously adopting circulating inflow, taking the ammonia nitrogen of the effluent water reduced to below 50 mg/L as a mark for finishing 1 period, and confirming that the second stage is finished and the short-cut nitrification stably runs when the running time of three continuous periods is less than or equal to 2 days and the nitrous accumulation rate is stabilized to be more than 90 percent;
(5) And (3) stopping circulating water inflow, changing the operation mode of the reactor into continuous water inflow and outflow, continuously controlling the reaction conditions, and continuously stabilizing the accumulation rate of the nitrite over 95 percent in continuous 6 days to prove the feasibility of stable operation of the short-cut nitrification.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A method for realizing rapid accumulation of nitrous is based on membrane separation circulating inlet water, and is characterized by comprising the following steps:
(1) Inoculating nitrified sludge in a membrane bioreactor, controlling the ammonia nitrogen of inlet water to be 150 mg/L, controlling the alkalinity of inlet water to be 5 ammonia nitrogen, controlling the aeration rate/ammonia nitrogen to be 0.5 to 1 (L/min)/(mg/L), and controlling the ammonia nitrogen/HRT to be 0.025-0.035 g/(L.h), and running for 5-7 days in such a way, so that the sludge is adaptive to a new environment, and self-culture bacteria are screened, and heterotrophic bacteria die;
(2) Then, circulating water inflow is started, effluent water filtered by the membrane module flows into the water inlet barrel, is uniformly mixed with the influent water and continuously flows into the membrane bioreactor as influent water again, so that the operation is continuously performed, matrix is not supplemented in the process, the influent water and the effluent water are measured every day, and when the ammonia nitrogen concentration of the effluent water is reduced to be below 100mg/L, a period is finished; then, replacing the inflow water with the original water distribution, continuously and circularly feeding water to finish the next period, and ending the first stage of circularly feeding water when the running time of three continuous periods is less than or equal to 1 day, wherein the accumulation rate of the nitrous oxide can reach more than 80%;
(3) Continuously adopting circulating water inflow, when the ammonia nitrogen in the effluent is reduced to be below 50 mg/L, ending one period, replacing the inflow water with the original water distribution, and ending the second stage of circulating water inflow when the running time of three continuous periods is less than or equal to 2 days, wherein the nitrous accumulation rate is maintained to be more than 90%;
(4) Stopping circulating water inflow, changing the operation mode of the reactor into continuous water inflow and outflow, continuously controlling the ammonia nitrogen of the inflow water to be more than 150 mg/L, the alkalinity of the inflow water to be more than 5, the aeration rate/ammonia nitrogen to be between 0.5 and 1 (L/min)/(mg/L), the ammonia nitrogen/HRT to be between 0.025 and 0.035 g/(L.h), and continuously stabilizing the nitrous accumulation rate to be more than 95 percent;
the original water distribution in the step (2) and the step (3) refers to water distribution with the ammonia nitrogen of the inlet water being more than 150 mg/L and the alkalinity of the inlet water/ammonia nitrogen being more than 5.
2. The method for realizing the rapid accumulation of the nitrous oxide based on the membrane separation circulating inlet water as claimed in claim 1, wherein: the concentration of the inoculated nitrified sludge in the step (1) is 7-10 g/L, and the volume of the nitrified sludge accounts for 20-30% of the effective volume of the membrane bioreactor.
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