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Denitrification method for waste water low in carbon nitrogen ratio

A low-carbon nitrogen ratio, denitrification technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of poor denitrification effect and improve the denitrification rate , the effect of improving the denitrification efficiency

Inactive Publication Date: 2015-11-11
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for wastewater with a low carbon-to-nitrogen ratio, the ordinary activated sludge method will directly affect the effect of denitrification due to insufficient carbon source due to high nitrogen content, resulting in poor denitrification effect. Usually, the denitrification removal rate is only 10% to 20%.

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  • Denitrification method for waste water low in carbon nitrogen ratio
  • Denitrification method for waste water low in carbon nitrogen ratio
  • Denitrification method for waste water low in carbon nitrogen ratio

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Experimental program
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Effect test

Embodiment 1

[0058] Wastewater water quality: In this embodiment, the domestic sewage reactor in the residential area is used as influent, the chemical oxygen demand is 235.05mg / L, the average concentration of nitrogen is 58.10mg / L, the average carbon-nitrogen ratio of influent is 3.9:1, and the pH Value = 7.5.

[0059] A cuboid-shaped SBR reactor is adopted, with a height of 20cm, a length of 10cm, and an effective volume of 1.5L; the middle and lower parts of the reactor are equipped with drains and sludge outlets. Inoculate the activated sludge in the SBR reactor, and add 88mg / L of CaCl to the reactor 2 , the concentration of activated sludge in the reactor after inoculation was 3730mg / L.

[0060] There are 2 cycles in the reactor every day, and each cycle includes 4 sections of water intake, aeration, static sedimentation and drainage, of which water intake is 5 minutes; aeration is 400 minutes, and the aeration rate is 300mL / min; drainage is 5 minutes, and the discharge volume per cy...

Embodiment 2

[0072] Wastewater water quality: In this embodiment, the domestic sewage reactor in the residential area is used as influent, the chemical oxygen demand is 235.05mg / L, the average concentration of nitrogen is 58.10mg / L, the average carbon-nitrogen ratio of influent is 3.9:1, and the pH Value = 7.5.

[0073] A cuboid-shaped SBR reactor is adopted, with a height of 20cm, a length of 10cm, and an effective volume of 1.5L; the middle and lower parts of the reactor are equipped with drains and sludge outlets. Inoculate the activated sludge in the SBR reactor, and add 90mg / L CaCl to the reactor 2, the concentration of activated sludge in the reactor after inoculation was 3630mg / L.

[0074] There are 2 cycles in the reactor every day, and each cycle includes 4 sections of water intake, aeration, static sedimentation and drainage, of which water intake is 6 minutes; aeration is 450 minutes, and the aeration rate is 350mL / min; drainage is 6 minutes, and the discharge volume per cycle ...

Embodiment 3

[0080] Waste water quality: In this embodiment, the campus domestic sewage is used as the reactor feed water, the chemical oxygen demand is 240.5 mg / L, the average concentration of nitrogen is 70.3 mg / L, the average carbon-nitrogen ratio of feed water is 3.42:1, and the pH value is 7.4.

[0081] A cylindrical SBR reactor with a height-to-diameter ratio of 2.5:1 was used, with an effective volume of 1.0 L and an average reaction temperature of 28 °C.

[0082] Inoculate the activated sludge in the SBR reactor, and add 88mg / L of CaCl to the reactor 2 , the concentration of activated sludge in the reactor after inoculation was 3730mg / L.

[0083] There are 2 cycles in the reactor every day, and each cycle includes 4 sections of water intake, aeration, static sedimentation and drainage, of which water intake is 5 minutes; aeration is 400 minutes, and the aeration rate is 300mL / min; drainage is 5 minutes, and the discharge volume per cycle 80% of the effective volume. In the first...

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Abstract

The invention discloses a denitrification method for waste water low in carbon nitrogen ratio, which comprises the following steps: inoculating aerobic granular sludge in a reactor, periodically running the reactor inoculated with the aerobic granular sludge according to the sequence of water feeding, aerating, precipitating, water draining and idling, and cultivating the aerobic granular sludge, wherein the time of aeration in the running process is shortened periodically; letting the waste water low in carbon nitrogen ratio to be processed to pass through the cultivated aerobic granular sludge, then carrying out denitrification on the waste water. According to the denitrification method provided by the invention, the reactor is run in a way of periodically shortening the time of aeration, so that nitrite bacteria of which the growth velocity is faster are favorably intercepted in the reactor, the growth of nitrobacteria of which the growth velocity is slower is restricted, and at the same time, aerobic denitrifying bacteria are enriched, thus, the phenomenon of shortened simultaneous nitrification and denitrification is favorably formed, and the denitrification efficiency of the waste water low in carbon nitrogen ratio can be greatly improved. The result of the embodiment of the application shows that the rate of denitrification of the application is improved by 250 percent on average in comparison with the average level of a conventional activated sludge process.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for denitrification of wastewater with a low carbon-to-nitrogen ratio. Background technique [0002] At present, with the improvement of living standards and changes in dietary structure, the nitrogen content in domestic sewage is getting higher and higher, resulting in a low carbon-nitrogen ratio, even lower than 6:1. Especially in southern cities, the low carbon-to-nitrogen ratio of sewage is prominent and the discharge volume is increasing day by day. In the "Twelfth Five-Year Plan", the country included nitrogen oxides and ammonia nitrogen into the total control system of pollutant discharge standards, and the requirements for carbon and nitrogen emissions have been increased. [0003] In the prior art, there are mainly chemical methods, physical methods and microbial methods for the removal of nitrogen in wastewater. Chemical denitrification is mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 信欣鲁航
Owner CHENGDU UNIV OF INFORMATION TECH
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