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Method for realizing SBR nitrosation-denitrosation at low temperature by optimally controlling aeration time

An aeration and low temperature technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve the effect of saving external carbon sources and reducing aeration energy consumption

Active Publication Date: 2011-02-16
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the method of realizing nitrification-denitritation of high ammonia nitrogen wastewater under low temperature conditions (10°C-18°C) by controlling the accumulation of free ammonia concentration, or optimizing the aeration time in real time according to the continuous pH monitoring curve.

Method used

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  • Method for realizing SBR nitrosation-denitrosation at low temperature by optimally controlling aeration time
  • Method for realizing SBR nitrosation-denitrosation at low temperature by optimally controlling aeration time
  • Method for realizing SBR nitrosation-denitrosation at low temperature by optimally controlling aeration time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、15

[0038] Example 1. Using the SBR method at 15°C to realize nitrosation-denitritation of landfill leachate

[0039] A landfill leachate is treated with a real-time control SBR system (see Table 1 for water quality indicators), and the reactor temperature is controlled at 15±0.5°C. This embodiment adopts the control mode a) of the present invention to realize nitrosation-denitritation. In the cycle (the cycle process includes 5 units, water inflow-facultative (anaerobic)-aerobic-precipitation-water outflow) nitrogen conversion and corresponding real-time curves such as figure 2 shown. NH in the reactor system 3 -N and TN jump with the water inflow, and the external carbon source is added to the system in the facultative stage, so that the NO produced by the aerobic unit in the previous cycle 2 -N and NO 3 -N is all restored to N 2 . Then the system enters the aerobic unit, and uses the appropriate aeration flow rate (about 3.5L / min, calculated and determined according to fo...

Embodiment 1

[0040] In embodiment 1, the SBR circulates the aerobic unit in each round, calculates according to the continuous monitoring value of ORP read by the computer, to judge whether the system needs to supplement the external carbon source (if dORP / dt2 ORP / dt 2 = 0, stop supplementing the carbon source, that is, figure 2 Stop replenishment when the K point in the middle). The aerobic unit calculates dpH / dt based on the pH continuous monitoring value read by the computer, and judges that a local minimum point ("ammonia valley point") appears on the real-time pH curve according to the change of dpH / dt from a negative value to a positive value, and uses this The point is the end of the time of the unit, so that the aeration is stopped in time to prevent the nitrous nitrogen from being further oxidized into nitrate nitrogen. The concentration and removal rate of influent and effluent pollutants are shown in Table 1.

[0041] Table 1. Running results of landfill leachate nitrification...

Embodiment 2、15

[0044] Example 2. Using SBR method at 15°C to realize nitrosation-denitritation of aquaculture wastewater

[0045] The real-time control SBR system is used to treat an intensive aquaculture wastewater (see Table 2 for the water quality index), and the temperature of the reactor is controlled at 15±0.5°C. denitrosation transformation. Concentrations of nitrogen pollutants in and out of water such as image 3 shown. 18 days before the operation of the reactor, the NH 3 -N and NO 2 -N is maintained at a low concentration level, while NO 3 -N accounts for more than 80% of TN. From the 19th day to the 32nd day, the aeration flow rate was reduced from 3.0L / min to 0.3L / min, and the NH in the system 3 -N gradually increased, while NO 3 -N rapidly decreased to 0mg / L. When the free ammonia concentration in the system rises to about 36.3mg / L (NH 3 -N≈205mg / L; pH=8.8), immediately restore the aeration rate to 3.0L / min for continuous aeration. NH 3 -N decreased to less than 5 mg...

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Abstract

The invention discloses a control method for realizing nitrosation-denitrosation of ammonia nitrogen wastewater at a low temperature by a sequencing batch reactor (SBR) method. Based on the conventional facultative anaerobic-aerobic intermittent activated sludge method, pH, oxidation-reduction potential (ORP) and dissolved oxygen (DO) are used as real-time monitoring parameters to establish an automatic control system in the method. The oxidation of nitrite is suppressed by controlling concentration of free ammonia (FA) in a reactor system at the temperature of between 10 and 18 DEG C, or the aeration time is optimally controlled according to an ammonia valley point on a pH real-time curve, so that high-concentration ammonia nitrogen wastewater is treated by nitrosation-denitrosation. By the method, the nitrosation rate can reach 80 percent, and the removal rates of TN, NH3-N and chemical oxygen demand (COD) reach over 95 percent, 99 percent and 90 percent respectively.

Description

technical field [0001] The invention relates to a method for realizing nitrosation-denitritation of high ammonia nitrogen wastewater by SBR method (sequenced batch activated sludge method) at low temperature. Background technique [0002] The continuous tightening of sewage discharge standards is the general development trend of countries in the world; the removal of nitrogen and phosphorus for the purpose of controlling eutrophication and the reduction of energy consumption in related processes have become important research directions. The traditional biological method usually uses the whole nitrification-denitrification process to remove nitrogen, that is, the aerobic unit oxidizes ammonia nitrogen into nitrite nitrogen by ammonia oxidizing bacteria (Ammonia Oxidizing Bacteria, AOB), and then oxidizes ammonia nitrogen into nitrite nitrogen by nitrifying bacteria (Nitrite Oxidizing Bacteria, NOB). Nitrate nitrogen is oxidized to nitrate nitrogen; the facultative oxygen (an...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F9/14
Inventor 陈梅雪秦德韬齐嵘方会强志民杨敏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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