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Method for regulating and controlling nitrogen proportion of partial nitrosation effluent of low-ammonia-nitrogen continuous stirred-tank reactor (CSTR) at normal temperature

A technology of nitrous nitrogen and low ammonia nitrogen, which is applied in the field of urban sewage treatment and resource utilization, can solve the problem that the accumulation effect of nitrite nitrogen is difficult to maintain stably, and achieve the effect of saving aeration and reducing volume

Active Publication Date: 2012-10-03
BEIJING UNIV OF TECH
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Problems solved by technology

However, due to the characteristics of ammonia oxidizing bacteria (AOB), normal temperature, low NH 4 + There is a large gap between -N wastewater and the ideal growth environment of AOB, so the accumulation effect of nitrite nitrogen under this environmental condition is difficult to maintain stably
In recent years, the research on nitrosation process mainly adopts the batch activated sludge process, while the research on the fully mixed continuous flow (CSTR) process is less

Method used

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  • Method for regulating and controlling nitrogen proportion of partial nitrosation effluent of low-ammonia-nitrogen continuous stirred-tank reactor (CSTR) at normal temperature
  • Method for regulating and controlling nitrogen proportion of partial nitrosation effluent of low-ammonia-nitrogen continuous stirred-tank reactor (CSTR) at normal temperature
  • Method for regulating and controlling nitrogen proportion of partial nitrosation effluent of low-ammonia-nitrogen continuous stirred-tank reactor (CSTR) at normal temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like figure 2 As shown, according to the second step, the initial nitrification performance of the sludge is better, and the ammonia nitrogen oxidation load is 0.2kgN / kgMLSS / d. Directly enter the second stage, control the initial ammonia nitrogen concentration at 187.0~238.0mg / L, pH at 7.80, and DO in the reactor at 0.40mg / L. Ensure that the concentration of ammonia nitrogen in the effluent is 70.0 mg / L. According to the periodic test, the aeration time is determined to be 8 hours, with 2 cycles per day. After 34 cycles, the nitrosation rate reaches more than 90%, and then runs for 7 cycles, and the nitrosation rate is above 90%. The nitrosation reactor started successfully and entered the third stage. The concentration of ammonia nitrogen in the influent is controlled at 71.7~84.6mg / L, and the aeration time is determined to be 5 hours according to the periodic test. It runs 2 cycles a day for 10 days. The nitrification rate is above 90%, and the operation mode can be...

Embodiment 2

[0039] like image 3 As shown, the ammonia nitrogen conversion load of the SBR low ammonia nitrogen operation period is 0.2kgN / kgMLSS / d, based on this value, when the influent NH 4 + When -N is 75.0mg / L, the amount of ammonia nitrogen removal is set at 38mg / L, V=30L, the initial HRT is 3.0h, and the DO concentration is 0.35mg / L. According to step 3, when the DO is 0.35mg / L on the first and second day, the water effluent NO 2 - -N / NH 4 + -N2 - -N / NH 4 + -N is between 1~1.32:1. And when the DO concentration was 0.39mg / L on the 9th day, the effluent ratio was 1.63>1.32, so the DO concentration should be reduced. Run for 34d at HRT=3.0h, NO 2 - -N / NH 4 + -N is between 1~1.32:1 for longer than 7d, it is considered that the water is NO 2 - -N / NH 4 + -N is regulated successfully, and the effluent NO is determined 2 - -N / NH 4 + When -N is between 1~1.32:1, the corresponding DO / ALR is 0.75mgO 2 / gNd2 / g N d, to ensure that the average nitrosation rate at this stag...

Embodiment 3

[0041] like Figure 4 As shown, in order to increase the ammonia nitrogen oxidation load of the reactor, the constant DO / ALR value is still controlled at 0.75mgO 2 / g N d, according to step 4, HRT is reduced from 3.0h in the previous stage to 2.5h. Adopting the DO concentration adjustment method in Step 3, the average effluent ratio was 1.04 on the 53rd to 62d. It is considered that the regulation of the effluent ratio was successful and the ammonia nitrogen conversion load reached 0.27kgN / (kgMLSS·d) at this stage. Continue to increase the ammonia nitrogen oxidation load of the reactor, the HRT is reduced to 1.5h, and the DO concentration adjustment method of step 3 is still adopted. From the 88th day to the 98th day, the average value of the effluent ratio was 1.18. It was considered that the regulation of the effluent ratio was successful, and the ammonia nitrogen conversion load reached 0.54 kgN / (kgMLSS·d) at this stage.

[0042] When the HRT is 3.0h, 2.5h and 1.5h, the r...

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Abstract

The invention provides a method for regulating and controlling nitrogen proportion of partial nitrosation effluent of low-ammonia-nitrogen continuous stirred-tank reactor (CSTR) at normal temperature and belongs to the field of municipal wastewater treatment and recycling. The starting is performed in a four-stage mode, and 80%-100% of ammoxidation load in the low-ammonia-nitrogen operation period of sequencing batch reactor activated sludge process (SBR) serves as initial ammoxidation load of the CSTR to confirm hydraulic retention time (HRT) of the CSTR. DO / ALR serves as an iconic parameter for maintaining a nitrosation system, and a value of the iconic parameter is recommended to be not greater than 1.0 mgO2 / gNd and is regarded as the regulating and controlling standard of the DO and the HRT. First, the HRT is constant, the DO is controlled singly, if the proportion is not reached or the ammoxidation load is not enough, the DO and the HRT can be regulated and controlled synchronously. The NO2--N / NH4+-N and ammonia-nitrogen oxidation rate (a) / nitrite nitrogen generating rate (b) and nitrite nitrogen generating rate (b) / nitrate nitrogen generating rate (c) of the effluent are compared. If an average value of the proportions of the effluent under the different working conditions is in a range of 1-1.32:1, when b / a is greater than 0.9 and more approximates to 1.0, b / c is greater, and the working condition is more suitable for long-term operation of the system. The NO2--N / NH4+-N of the effluent of the CSTR is guaranteed to be in a range of 1-1.32:1 so as to meet the water feeding requirement of an anaerobic oxidation technology.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically, it involves the stable operation of the partial nitrosation process of the continuous flow completely mixed (CSTR) reactor in the treatment of low ammonia nitrogen wastewater under normal temperature conditions and the method of controlling the appropriate effluent ratio, so that CSTR can obtain nitrite under the condition of a relatively high nitrosation rate. Nitrogen / ammonia nitrogen is 1~1.32:1 effluent to meet the influent demand of the anammox process. Background technique [0002] The problem of controlling nitrogen pollution in sewage and wastewater is one of the important topics in the field of water pollution control at present, and research on new energy-saving and consumption-reducing wastewater denitrification technology has become a hot issue in the field of water pollution control. [0003] The traditional nitrification-denitrification process is a...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
Inventor 李冬吴迪仲航刘丽倩张昭张功良苏东霞高伟楠王斌孙宇李德祥杨卓崔少明周利军曾辉平张杰
Owner BEIJING UNIV OF TECH
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