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A sewage treatment system and method for reducing greenhouse gas emissions

A sewage treatment system and greenhouse gas technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems that are not conducive to economic and environmental development, increase the greenhouse effect, and waste Energy and other issues to achieve the effect of reducing the loss of sludge, slowing down the greenhouse effect, and reducing costs

Active Publication Date: 2016-10-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As bioenergy, methane has not been effectively utilized as a resource and a large amount of disorderly emissions has increased the greenhouse effect and wasted energy, which is not conducive to the development of my country's economy and environment
[0005] It can be seen that in the biological treatment of sewage, secondary pollution often occurs and causes waste of resources

Method used

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  • A sewage treatment system and method for reducing greenhouse gas emissions

Examples

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Effect test

Embodiment 1

[0031] Using the above device, the specific operation method is as follows:

[0032] 1) Inoculate the cultivated and domesticated short-range nitrification sludge into MBBR, and the sludge concentration MLSS after dosing is 30-35g / L; The sludge concentration MLSS is 10-15g / L;

[0033] 2) The sewage enters the MBBR after adjusting the water volume and uniform water quality, and the air blower and air flow meter adjust the flow to provide the oxygen needed by the ammonia-oxidizing bacteria inoculated in the MBBR and to circulate the filler in the reactor to achieve NO 2 - accumulation. The operating temperature of MBBR is controlled at 20-25°C, the operating pH is 6.5-8.5, the hydraulic retention time HRT is 16-20h, the sludge age is controlled at 1.0-1.5d, and the dissolved oxygen DO is controlled at 0.5-1.0mg / L;

[0034] 3) The effluent of MBBR is introduced into the stripping tank through a peristaltic pump to remove dissolved oxygen in the water;

[0035] 4) Then enter t...

Embodiment 2

[0037] Using the above device, the specific operation method is as follows:

[0038] 1) Inoculate the cultivated and domesticated short-range nitrification sludge into MBBR, and the sludge concentration MLSS after dosing is 35-40g / L; The sludge concentration MLSS is 15-20g / L;

[0039] 2) The sewage enters the MBBR after adjusting the water volume and uniform water quality, and the air blower and air flow meter adjust the flow to provide the oxygen needed by the ammonia-oxidizing bacteria inoculated in the MBBR and to circulate the filler in the reactor to achieve NO 2 - accumulation. The operating temperature of MBBR is controlled at 25-28°C, the operating pH is 6.5-8.5, the hydraulic retention time HRT is 20-24h, the sludge age is controlled at 2.0-2.5d, and the dissolved oxygen DO is controlled at 1.0-1.5mg / L;

[0040] 3) The effluent of MBBR is introduced into the stripping tank through a peristaltic pump to remove dissolved oxygen in the water;

[0041] 4) Then enter t...

Embodiment 3

[0043]Use the above-mentioned sewage treatment system to reduce greenhouse gas emissions to treat domestic sewage in a certain area. The water quality characteristics of sewage are: low COD, 120-266mg / L, BOD 5 13-48mg / L, BOD 5 The / COD is 0.19-0.4, the ammonia nitrogen content is relatively high, 32-45mg / L, and the highest sustainable value is 60mg / L. The sludge concentration in MBBR is maintained at 35-40g / L, and the sludge concentration in UASB is maintained at 15-20g / L. NO 2 - The accumulation is then utilized by denitrifying anaerobic methane oxidizing bacteria, and finally realizes the denitrification and carbon removal of sewage. The final effluent index COD is within 50mg / L, the effluent ammonia nitrogen is within 5mg / L, and the N 2 O emission is reduced by 61.5% compared with traditional treatment processes, and there is no methane gas emission, which has good denitrification and carbon removal effects and reduces greenhouse gas emissions.

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Abstract

The invention relates to a sewage treatment system and a sewage treatment method for reducing greenhouse gas emission. The system comprises a moving bed biomembrane biochemical reactor MBBR, an air stripping pool and an up-flow anaerobic sludge blanket UASB which are sequentially connected, wherein bio-filler is arranged in the MBBR, an aerating head is arranged at the bottom, an intercepting screen is arranged at an upper overflowing water outlet for preventing loss of the bio-filler, a mud outlet is formed at the bottom of the UASB, a sludge return opening is formed on the upper part, and a three-phase separator and an air outlet are formed on the top. Sewage enters into the MBBR for intermittent aeration, so that accumulation of NO<2-> is realized; effluent of the MBBR enters into the air stripping pool through a peristaltic pump to remove dissolved gas in water and then enters into the UASB; denitrifying anaerobic methane-oxidizing bacteria convert NO<2-> into N2 to be removed. According to the system provided by the invention, the UASB is coupled by using the MBBR, so that actual sewage with low carbon nitrogen ratio is treated in an energy-saving and efficient manner with less secondary pollution.

Description

technical field [0001] The invention relates to a sewage biological treatment system and method, in particular to an MBBR-coupled UASB sewage treatment system and method for reducing greenhouse gas emissions, and belongs to the technical field of sewage treatment. Background technique [0002] The global warming potentials of methane and nitrous oxide are 25 times and 296 times that of carbon dioxide, respectively, and are the second and third greenhouse gases in the atmosphere after carbon dioxide. Sewage biological treatment is the global CH 4 and N 2 An important source of O, respectively, accounted for the global anthropogenic CH 4 and N 2 7.1% and 3.2% of the total O emissions. [0003] The traditional sewage biological denitrification process mainly consists of two stages: nitrification and denitrification. The nitrification process needs to provide sufficient oxygen to maintain the metabolism of nitrifying bacteria; in the treatment of sewage with insufficient ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 张建马茹安沫霖胡振张成禄
Owner SHANDONG UNIV
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