CN112358042B - Culture method of wastewater treatment denitrification denitrogenation granular sludge - Google Patents
Culture method of wastewater treatment denitrification denitrogenation granular sludge Download PDFInfo
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- CN112358042B CN112358042B CN202010974480.7A CN202010974480A CN112358042B CN 112358042 B CN112358042 B CN 112358042B CN 202010974480 A CN202010974480 A CN 202010974480A CN 112358042 B CN112358042 B CN 112358042B
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a culture method of denitrification granular sludge for wastewater treatment, which firstly disciplines a sewage treatment plantInoculating the converted denitrifying flocculent sludge into a denitrifying granular sludge reactor, and controlling COD (chemical oxygen demand) concentration and NO (nitric oxide) by taking simulated wastewater as inflow water 3 ‑ Concentration ratio of N, culture under anaerobic conditions with monitoring of NO 3 ‑ Water out of-N in the presence of NO 3 ‑ Under the premise that the-N removal rate is more than 80 percent, the COD and NO in the inlet water are continuously increased 3 ‑ N concentration up to COD, NO 3 ‑ When the concentration of-N reaches a certain value, waiting for NO 3 ‑ When the N removal rate reaches more than 90 percent, adjusting the residence time of the reactor until the NO in the effluent is discharged 3 ‑ The removal rate of-N reaches more than 95 percent, and the denitrification granular sludge for wastewater treatment is obtained. The denitrification denitrogenation granular sludge cultured by the invention has the advantages of good settling property, high biological concentration, low operation cost and energy consumption, high impact load resistance, strong anti-toxicity effect and the like, reduces the operation cost and energy consumption of the reactor, and can be used for treating high COD (chemical oxygen demand) and high NO (nitric oxide) 3 ‑ -N waste water.
Description
Technical Field
The invention belongs to a culture method of granular sludge, and particularly relates to a culture method of denitrification and denitrogenation granular sludge for wastewater treatment.
Background
The feasibility and the economical efficiency of biological denitrification are superior to those of other processes, and the key of the biological denitrification lies in denitrification. The denitrification process is a process that denitrifying bacteria reduce nitrogen in nitrate into nitrogen through a series of intermediate products. When organic wastewater contains COD and nitrate nitrogen with higher concentration, flocculent denitrification sludge is gradually granulated when the wastewater is treated in a constant temperature and anaerobic mode. The traditional denitrification sludge denitrification has the problems of low denitrification efficiency, high energy consumption and the like, compared with the traditional denitrification flocculent sludge denitrification, the culture of the denitrification granular sludge can effectively remove COD (chemical oxygen demand) and nitrate nitrogen in organic wastewater, and the granular sludge has the advantages of good sedimentation performance, high biological concentration, low operation cost and energy consumption, high impact load resistance, strong anti-toxicity effect and the like, and can save the expenses of land occupation area, medicament use, power consumption, sludge disposal and the like. The cultivation of the denitrification nitrogen removal granular sludge brings more benefits, and the cultivation of the denitrification nitrogen removal granular sludge also becomes the focus of attention.
Disclosure of Invention
The invention aims to provide a culture method of wastewater treatment denitrification nitrogen removal granular sludge, which effectively promotes the formation of the wastewater treatment denitrification nitrogen removal granular sludge through a denitrification nitrogen removal granular sludge reactor and obtains the denitrification nitrogen removal granular sludge through controlling test parameters.
The technical scheme of the invention is as follows: the method comprises the steps of taking denitrification flocculent sludge domesticated in a sewage treatment plant as inoculation sludge, inoculating the inoculation sludge into a denitrification granular sludge reactor, taking simulated wastewater as inflow water, and simulating wastewater NO 3 - The initial value of-N is 1,000-1,500mg/L, the initial value of COD is 4,000-7,500mg/L, the COD concentration and NO are controlled 3 - A ratio of-N concentration of 4-5 to 1, culturing under anaerobic conditions while monitoring NO 3 - Water out of-N in the presence of NO 3 - Under the premise that the-N removal rate is more than 80 percent, the COD and NO in the inlet water are continuously increased 3 - N concentration until NO 3 - The N concentration is increased to 2,000-3,000mg/L, the COD concentration is increased to 8,000-1,5000mg/L, and then NO is added 3 - -a decrease in the removal rate of N; stopping increasing COD and NO in the feed water 3 - After concentration of-N, NO 3 - Increasing concentration of-N to NO 3 - When the N removal rate is increased to more than 90%, the residence time of the reactor is adjusted to the original residence50% -100% of the time; to discharge NO 3 — The removal rate of N reaches more than 95 percent, and the denitrification granular sludge for wastewater treatment is obtained.
Preferably, said NO 3 - The initial value of-N was 1,000mg/L and the initial value of COD was 4,000mg/L.
Preferably, the ratio of the COD concentration to the NO3- -N concentration is 4 to 1.
Preferably, the COD and the NO3- -N concentration in the inlet water are continuously increased after the NO3- -N removal rate in the reactor is kept to be more than 80% and the running time is at least 5 days, wherein the NO3- -N removal rate is kept to be more than 80%.
Preferably, the culture temperature of the reactor is 30 +/-2 ℃, the pH value is 3.5-6.5, and the hydraulic retention time is 1-2 days.
Preferably, the culture temperature of the reactor is 30 ℃, the pH value is 3.5, and the hydraulic retention time is 1d.
Preferably, the residence time of the reactor is adjusted to 50% of the original residence time.
Preferably, the simulated wastewater comprises COD and NO 3 - -N, phosphate and trace elements Mn, co, cu, zn, ni, mo, se.
The invention adopts the technology of wastewater treatment denitrification granular sludge to rapidly culture the wastewater treatment denitrification granular sludge with good settling property, high biological concentration, large particle size, high impact load resistance and strong antitoxic effect, thereby effectively solving the problem of biological toxicity inhibition of high-toxicity pollution factors to microorganisms, having high biological treatment load, high removal efficiency, stable system work, good treatment effect, floor area saving, and operation cost and energy consumption reduction. Compared with the prior art, the invention effectively promotes the formation of the denitrification nitrogen removal granular sludge by utilizing the wastewater treatment denitrification nitrogen removal granular sludge reactor, the obtained granular sludge has high activity, stable performance, good settling property, high biological concentration, high impact load resistance and strong toxicity resistance, can effectively treat the wastewater containing high-concentration nitrate nitrogen, ensures the high load treatment capacity, stability and treatment capacity of the wastewater treatment denitrification nitrogen removal granular sludge reactor, and reduces the wastewater treatment cost.
Drawings
FIG. 1 shows COD and NO in the granular sludge culture process of the present invention 3 - -N removal effect map;
FIG. 2 is an appearance diagram of a denitrification granular sludge.
Detailed Description
The invention will be further described with reference to the following examples, but the scope of applicability of the invention is not limited thereto:
example 1:
a denitrification granular sludge reactor (effective volume is 16L) is adopted for carrying out a denitrification granular sludge culture test, denitrification flocculent sludge domesticated in a sewage treatment plant is inoculated into the denitrification granular sludge reactor, simulated wastewater is taken as inlet water, the sludge concentration of the inoculated reactor is 5.0g/L, and NO of the simulated wastewater is 3 - Initial value of-N is 1,000mg/L, initial value of COD is 4,000mg/L, COD concentration and NO are controlled 3 - Concentration ratio of-N4 to 1, culturing under anaerobic conditions in the absence of light while monitoring NO 3 - The effluent condition of N, the culture temperature of the reactor is 32 ℃, the pH value is 3.5, the hydraulic retention time is 1d, and the simulated wastewater comprises COD and NO 3 - -N, phosphate and trace elements Mn, co, cu, zn, ni, mo, se.
In the maintenance of NO 3 - The removal rate of-N is more than 80 percent, and COD and NO in the inlet water are continuously increased on the premise of stable operation for 5d 3 - N concentration until NO 3 - The concentration of N reaches 2,000mg/L, the concentration of COD reaches 8,000mg/L, and NO is added 3 - When the N removal rate reaches more than 90%, the reactor residence time is adjusted to 50% of the original residence time, namely 0.5d.
After 60 days of continuous operation, the flocculent sludge in the reactor forms obvious granular sludge, NO in the test process 3 - The removal rate of-N is 98.3 +/-1.5%, the form of the denitrification denitrogenation granular sludge is smooth-surfaced and grey-brown granular sludge, and the average grain diameter of the granular sludge is 3.0mm.
Example 2:
a denitrification granular sludge reactor (effective volume is 16L) is adopted for carrying out a denitrification granular sludge culture test, denitrification flocculent sludge domesticated by a sewage treatment plant is inoculated into the denitrification granular sludge reactor, simulated wastewater is taken as inlet water, the sludge concentration of the inoculated reactor is 5.0g/L, and NO in the simulated wastewater is 3 - The initial value of N is 1,500mg/L, the initial value of COD is 7,500mg/L, and the COD concentration and NO are controlled 3 - A ratio of-N concentration of 5, culturing under anaerobic conditions protected from light while monitoring NO 3 - The effluent condition of N, the culture temperature of the reactor is 28 ℃, the pH value is 6.5, the hydraulic retention time is 2d, and the simulated wastewater comprises COD and NO 3 - -N, phosphate and trace elements Mn, co, cu, zn, ni, mo, se.
In the maintenance of NO 3 - The removal rate of-N is more than 80 percent, and COD and NO in the inlet water are continuously increased on the premise of stable operation for 8d 3 - N concentration until NO 3 - The concentration of N reaches 3,000mg/L, the concentration of COD reaches 1,5000mg/L, and after NO is obtained 3 - When the N removal rate reaches more than 90%, the reactor residence time is adjusted to 100% of the original residence time, i.e. 2d.
After 60 days of continuous operation, the flocculent sludge in the reactor forms obvious granular sludge, NO in the test process 3 - the-N is 95.3 +/-2.0 percent, the form of the denitrification denitrogenation granular sludge is smooth-surfaced and grey-brown granular sludge, and the average grain diameter of the granular sludge is 2.5mm.
The denitrification sludge obtained by the method can be used for purifying sewage in wastewater containing high-concentration organic matters and nitrate nitrogen, the COD concentration of the sewage is 8,000mg/L, and NO is 3 - The N concentration is 1,000mg/L, the denitrification denitrogenation granular sludge is thrown into the wastewater, after the sewage treatment is carried out under anaerobic condition, the COD concentration in the wastewater is 260mg/L, NO is added 3 - The concentration of N is 6mg/L.
Test results prove that the method can culture the denitrification denitrogenation granular sludge in a shorter time, and the obtained granular sludge has high activityStable performance, good sedimentation performance, high biological concentration, high impact load resistance and strong toxicity resistance, and can effectively remove COD and NO in wastewater 3 - N, improving the stability of the reactor.
Claims (6)
1. A culture method of denitrification denitrified granular sludge is characterized by comprising the following steps:
the method comprises the steps of taking the denitrifying flocculent sludge domesticated by a sewage treatment plant as inoculation sludge, inoculating the inoculation sludge into a denitrifying denitrification granular sludge reactor, taking simulated wastewater as inflow water, and simulating NO in the wastewater 3 - The initial value of-N is 1,000 to 1,500mg/L, the initial value of COD is 4,000 to 7,500mg/L, and the concentration of COD and NO are controlled 3 - The concentration ratio of-N to-N is 4-5 to 1, the culture is carried out under the anaerobic condition, the temperature of the culture is 30 +/-2 ℃, the pH value is 3.5-6.5, the hydraulic retention time is 1-2d, and NO is monitored at the same time 3 - Water out of N in the presence of NO 3 - Under the premise that the running time is at least 5 days when the N removal rate is more than 80 percent, the COD and NO in the inlet water are continuously increased 3 - N concentration until NO 3 - The N concentration reaches 2,000mg/L and the COD concentration reaches 8,000mg/L; to NO 3 - When the N removal rate reaches more than 90%, adjusting the residence time of the reactor to 50-100% of the original residence time; after 60d of continuous operation, discharging NO 3 - the-N removal rate reaches more than 95 percent, and the wastewater treatment denitrification denitrogenation granular sludge is obtained.
2. The method for culturing the denitrifying granular sludge according to claim 1, in which the NO is 3 - The initial value of-N was 1,000mg/L and the initial value of COD was 4,000mg/L.
3. The method for culturing the denitrifying granular sludge according to claim 1, in which the COD concentration and NO are measured 3 - The ratio of-N concentration is 4 to 1.
4. The method for culturing the denitrification granular sludge according to claim 1, wherein the culture temperature is 30 ℃, the pH value is 3.5, and the hydraulic retention time is 1d.
5. The method of culturing denitrifying granular sludge according to claim 1, wherein the residence time of the reactor is adjusted to 50% of the original residence time.
6. The method of culturing denitrification nitrogen removal granular sludge according to claim 1, wherein the simulated wastewater comprises COD and NO 3 - -N, phosphate and trace elements Mn, co, cu, zn, ni, mo, se.
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| CN105540834A (en) * | 2015-12-29 | 2016-05-04 | 杭州师范大学 | Culture method of anaerobic denitrification granular sludge |
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