Method for adding a denitriding sequencing batch reactor activated sludge reaction carbon source

A serial intermittent, activated sludge technology, applied in the field of real-time control, can solve problems such as denitrification cannot be carried out smoothly, and achieve the effect of optimizing energy consumption

Inactive Publication Date: 2010-01-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the condition that the denitrification cannot be...

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  • Method for adding a denitriding sequencing batch reactor activated sludge reaction carbon source
  • Method for adding a denitriding sequencing batch reactor activated sludge reaction carbon source
  • Method for adding a denitriding sequencing batch reactor activated sludge reaction carbon source

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Embodiment 1

[0019] Example 1: In a certain intensive pig raising wastewater treatment, when the total organic carbon / total nitrogen (TOC / TN) in the influent was 0.69, due to the obvious lack of carbon source in the influent, livestock and poultry manure was used as the Additional carbon source. The tracer analysis that adopts the system processing of the present invention such as figure 2 shown. A is the start of anaerobic (anoxic) after water ingress. With the wastewater entering the system and the nitrate produced in the aerobic process of the previous cycle, the carbon source in the influent is used for denitrification reaction. Due to the lack of carbon source in the influent, the livestock and poultry manure diluted from point B is 10 grams per pulse. Adding to the system, after the first addition, the nitrate concentration only slowly dropped from 12mg / L to 10mg / L, and the second addition started because the denitrification did not reach complete. This cycle to the sixth dosing,...

Embodiment 2

[0021] Implementation 2: In the landfill leachate treatment process, under the condition of low C / N ratio influent, in this embodiment, methanol is used as an additional carbon source, and the trace analysis of the system treatment of the present invention is as follows: Figure 4 shown. Due to the lack of carbon source in the influent, methanol diluted from point B was added to the system at 10 ml per pulse. After the first addition, the nitrate concentration was only slowly reduced from 12 mg / L to 10 mg / L. Nitrification, the second dosing begins. This cycle until the third dosing, the nitrate concentration is close to zero, and at the same time, there is a significant slope change on the ORP curve, and point C is the denitrification control point. Exogenous nutrient addition ceases at point C. Point D is the starting point of aeration, and the ORP rises rapidly. As the nitrification proceeds, the concentration of ammoniacal nitrogen drops rapidly, and at point E, the nitr...

Embodiment 3

[0022] Embodiment 3: Due to management methods and seasonal changes, the water quality of livestock wastewater varies greatly, especially the ammoniacal nitrogen content in the wastewater is very high, Figure 5 Because the present invention is used for ORP and pH curves with a TOC / TN ratio of 0.5-1.6 in a wide range, in the range of TOC / TN ratio of 1.3-1.6, the carbon source provided by the influent can ensure the smooth progress of denitrification. The denitrification point and nitrification point in the oxygen (anoxic) and aerobic stages are obvious. In the range of TOC / TN ratio of 0.5-0.8, it is necessary to add an external carbon source to achieve complete denitrification. Here, the changing HRT is inversely proportional to the C / N ratio, ie a higher C / N ratio corresponds to a shorter HRT. In the two ranges of C / N ratios, the HRT was 6.3 days and 10 days, respectively. This is due to the fact that under low C / N ratio influent conditions, the system needs to judge whether...

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Abstract

The invention relates to an optimal carbon source supplement real time control system used in a sequencing batch reactor activated sludge process for denitriding nitrogen-containing wastewater with a low C/N ratio. In the conventional sequencing anaerobic-aerobic batch reactor activated sludge process, the automatic control system uses an oxidation-reduction potential (ORP), a pH value and a DO curve slope variation value as control parameters and particularly adopts technology for automatically controlling optimal denitrification external carbon source addition at an anaerobic (aerobic) stage. The aeration time is controlled in the aerobic stage of the reaction and the addition amount of external nutrients is automatically controlled in the anaerobic stage of the reaction to optimize the system. The system can automatically adjust the hydraulic retention time in reaction processes according to the treatment conditions of the system such as inflowing water quality, a nitrification degree and a denitrification degree so as to ensure stable quality (ammonia nitrogen removal rate of over 99 percent) of treated water and optimal energy consumption.

Description

technical field [0001] The invention belongs to the application field of real-time automatic control in waste water treatment, in detail, it is a method for real-time control in sequential batch-type activated sludge process for denitrification treatment of low C / N ratio nitrogen-containing waste water. Background technique [0002] The continuous tightening of sewage discharge standards is a common development trend in all countries in the world; the removal of nitrogen and phosphorus for the purpose of controlling eutrophication has become the main goal of all countries. The traditional sequential batch activated sludge process uses a continuous anaerobic-aerobic process (ie, denitrification-nitrification process) and is widely used in sewage treatment plants. However, a fixed time control program is adopted in the treatment, and the aeration amount in most reactions is excessive due to the changeable water quality of the influent. At the same time, in order to ensure the...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 陈梅雪秦德韬丁然何士龙强志民杨敏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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