Synchronous nitrification and denitrification coupled dephosphorization method for domestic sewage with low carbon nitrogen ratio

A domestic sewage and simultaneous nitrification technology, applied in the field of sewage treatment, can solve the problems of low nitrogen removal efficiency and unsatisfactory phosphorus removal effect, and achieve the effect of reducing the accumulation of nitrate

Inactive Publication Date: 2015-06-24
CHENGDU UNIV OF INFORMATION TECH
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  • Application Information

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Problems solved by technology

The traditional biological denitrification process has low denitrification efficiency and unsa

Method used

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  • Synchronous nitrification and denitrification coupled dephosphorization method for domestic sewage with low carbon nitrogen ratio
  • Synchronous nitrification and denitrification coupled dephosphorization method for domestic sewage with low carbon nitrogen ratio
  • Synchronous nitrification and denitrification coupled dephosphorization method for domestic sewage with low carbon nitrogen ratio

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The SBR device is used to treat domestic sewage with low carbon-to-nitrogen ratio. The average concentrations of COD, ammonia nitrogen and TP in the domestic sewage influent are 235.05mg / L, 58.10mg / L and 3.10mg / L respectively; the average influent carbon-nitrogen ratio (COD / N) is 3.9, and the pH value=7.5, and the reactor is a rectangle, with a height of 20cm, a length of 10cm, and an effective volume of 1.5 L; Mud, with a diameter of 0.6mm to 1.5mm, a brownish yellow color, a water content of 96.3%, and a wet density of 1.052g / cm 3 , the sedimentation velocity is 22m / h~46m / h, the mechanical strength is 96.8%, and the air compressor is used to aerate through the sand table aeration head at the bottom, and the reaction temperature is about 30°C.

[0059] The scanning electron microscope pictures of aerobic granular sludge are as follows: figure 1 as shown, figure 1 It is the SEM picture of the mature aerobic granular sludge inoculated in Example 1 of the present inven...

Embodiment 2

[0068] A cylindrical SBR reactor with a ratio of height to diameter of 2.5:1 is used, and the effective volume is 1.0L. Artificially simulated urban domestic sewage is used as the reactor feed water, and the feed sewage indicators COD, NH 4 + The average concentrations of -N and TP are 290.35, 65.4 and 3.6 mg / L, respectively, the average carbon-to-nitrogen ratio (COD / N) of the influent water is about 4.4, the reaction pH in the reactor is about 7.35, and the average reaction temperature is 26°C.

[0069] The operation process of the SBR reactor mode: 2 cycles per day, the total duration of each cycle is 405 minutes, each cycle includes 10 minutes of water intake time, 380 minutes of aeration time, 10 minutes of sedimentation time and 5 minutes of drainage time, and the rest of the time is idle. The volume of sewage replaced per cycle is 60% of the effective volume of the reactor. The average concentration of reactor inoculated granular sludge was 3980mg / L, and its SVI was 39...

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Abstract

The invention provides a synchronous denitrification dephosphorization method for domestic sewage with a low carbon nitrogen ratio. The method comprises the steps that the to-be-treated domestic sewage is subjected to intermittent aeration by being inoculated with aerobic granular sludge, and after the aeration, the to-be-treated domestic sewage continuously passes through the aerated sludge, wherein the intermittent aeration comprises a first stage aeration, a second stage aeration and a third stage aeration, the dissolved oxygen concentrations after the first stage aeration, the second stage aeration and the third stage aeration are reduced sequentially, and the running time of each stage aeration is not less than 7d. According to the method, dissolved oxygen concentration gradient differences exist from the surface to the interior of the aerobic granular sludge, and an 'aerobic-anoxic-facultative anaerobic' regional microenvironment is formed, so that microreaction conditions are provided for synchronous denitrification dephosphorization of the domestic sewage with the low carbon nitrogen ratio; in addition, the aeration quantity is reduced gradually, so that the entrapment of a nitrite bacteria microbial population and shortened synchronous nitrification and denitrification are ensured; and the method realizes rapid synchronous nitrification and denitrification coupled dephosphorization and efficient synchronous denitrification dephosphorization.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a simultaneous nitrification and denitrification coupled phosphorus removal method for biochemical sewage with a low carbon-to-nitrogen ratio. Background technique [0002] According to the classification of sewage sources, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Domestic sewage is the sewage generated in daily life, which refers to the complex mixture of various forms of inorganic and organic matter, including floating and suspended solid particles of large and small sizes, colloidal and gel-like diffusers, and pure solutions. Domestic sewage treatment is the process of removing organic and inorganic impurities contained in domestic sewage by physical, chemical and biological methods, so that the water quality can meet the discharge standards or reuse requirements. [0003] In the prior art, microbial denitr...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 信欣冷璐鲁磊鲁航
Owner CHENGDU UNIV OF INFORMATION TECH
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