Process and device of low energy consumption sewage treatment based on carbon source recovery

A sewage treatment, low energy consumption technology, applied in the field of environmental protection and sewage treatment, can solve the problems of difficult solid-liquid separation, low solid content of sludge, oxygen consumption, etc., to improve the solid-liquid separation effect, improve the settling performance, The effect of reducing emissions

Active Publication Date: 2012-07-11
TONGJI UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems in the current front-end carbon source recovery process: (1) using microorganisms to enrich and recover carbon sources under aerobic conditions still needs to consume a certain amount of oxygen; (2) the solid content of sludge Low (4000 mg/L-6000 mg/L), the sludge needs to be pre-con

Method used

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  • Process and device of low energy consumption sewage treatment based on carbon source recovery
  • Process and device of low energy consumption sewage treatment based on carbon source recovery
  • Process and device of low energy consumption sewage treatment based on carbon source recovery

Examples

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Effect test

Embodiment 1

[0028] A low-energy sewage treatment process based on carbon source recovery, using polyferric chloride PFC as a polymer coagulant (dosage 50 g PFC / ton of water), after the raw sewage water is efficiently coagulated in a rapid sedimentation tank, the hydraulic retention time is 2 minutes , enter the anaerobic dynamic membrane-bioreactor for anaerobic treatment and solid-liquid separation, and the hydraulic retention time is 2.5h. The dynamic membrane module flux in the anaerobic reactor is 100 L / (m 2 h), the organic load of the reactor is 2.20 kg COD / (m 3 d). This process treats domestic sewage in a southern city. The influent COD concentration is 300.4±68.8 mg / L, the ammonia nitrogen concentration is 31.0±6.5 mg / L, the total nitrogen concentration is 51.3±13.4 mg / L, and the total phosphorus concentration is 7.2±3.4 mg / L. L; the effluent COD concentration of the device is 82.7±16.6 mg / L, the ammonia nitrogen concentration is 21.2±3.4 mg / L, and the total phosphorus concentrat...

Embodiment 2

[0030] A low-energy sewage treatment process based on carbon source recovery, using polysilicate ferric chloride PFSC as a polymer coagulant (dosage 75 g PFSC / ton of water), after the raw sewage water is efficiently coagulated in a rapid sedimentation tank, hydraulic retention After 2 minutes, it enters the anaerobic dynamic membrane-bioreactor for anaerobic treatment and solid-liquid separation, and the hydraulic retention time is 2.2h. The flux of the dynamic membrane module in the anaerobic reactor is 60 L / (m 2 h), the organic load of the reactor is 3.27 kg COD / (m 3 d). Using this sewage treatment process to treat a city's domestic sewage, the influent COD concentration is 234.6-680.8 mg / L, the ammonia nitrogen concentration is 23.2-43.5 mg / L, the total nitrogen concentration is 45.3-68.7 mg / L, and the total phosphorus concentration is 3.8-10.6 mg / L ;The concentration of COD in the effluent of the device is 24.6~88.7mg / L, the concentration of ammonia nitrogen is 14.3...

Embodiment 3

[0032] A low-energy sewage treatment process based on carbon source recovery, using polysilicate ferric chloride PFSC as a polymer coagulant (dose 50 g PFSC / ton of water), after the raw sewage water is efficiently coagulated in the rapid sedimentation tank, the hydraulic retention After 2 minutes, it enters the anaerobic dynamic membrane-bioreactor for anaerobic treatment and solid-liquid separation, and the hydraulic retention time is 1.2h. The flux of the dynamic membrane module in the anaerobic reactor is 65 L / (m 2 · h), the organic load of the reactor is 3.10 kg COD / (m 3 d). This sewage treatment process was used to treat domestic sewage in a rural area. The influent COD concentration was 128.3~289.8 mg / L, the ammonia nitrogen concentration was 12.6~39.2 mg / L, the total nitrogen concentration was 23.8~55.7 mg / L, and the total phosphorus concentration was 1.6~5.5 mg / L. L; the concentration of COD in the effluent of the device is 36.3~83.8mg / L, the concentration of a...

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Abstract

The invention relates to a process and a device of low energy consumption sewage treatment based on carbon source recovery, which belong to the technical field of sewage (waste water) treatment. A process flow comprises a rapid coagulating basin, an anaerobic dynamic membrane-bioreactor, an effluent natural reoxygenation machine, an anaerobic digestion reactor and a gas collector. High efficient flocculation of low concentration organic sewage is carried out in the rapid coagulating basin, solid-liquid separation of the low concentration organic sewage is carried out in the anaerobic dynamic membrane-bioreactor, natural reoxygenation of effluent is carried out, and water quality stably achieves the national second grade discharge standard. Simultaneously, recovered low-quality carbon sources (anaerobic sludge) enter the anaerobic digestion reactor to finally enable energy matters in the sewage to be recovered in a mode of high-quality carbon sources of volatile fatty acids (VFAs) or methane and the like through a hydrolyzing-fermenting and producing acids-producing the methane approach. By means of coupling between a sewage treatment method and an anaerobic organism treatment process, high efficient treatment of the low concentration organic sewage is achieved in a short hydraulic retention time. The high efficient treatment of the low concentration organic sewage can be carried out on the condition of normal temperature, and energy conservation and consumption reduction of the sewage treatment can be achieved to the greatest extend.

Description

technical field [0001] The invention belongs to the fields of environmental protection and sewage treatment, and in particular relates to a low-energy sewage treatment process and device based on carbon source recovery. Background technique [0002] Resource shortage and climate change are the greatest challenges and threats faced by mankind in the 21st century. At present, all countries in the world are actively taking actions to save energy resources and reduce greenhouse gas emissions. With the continuous deepening of energy saving and emission reduction work, urban sewage treatment plants, as one of the main carriers of emission reduction, are particularly important in emission reduction work. Under this background, the traditional biological treatment process, which has been developed for nearly 100 years and is widely used in the world, is undergoing unprecedented doubts. In the traditional activated sludge method (conventional activated sludge, CAS) and its derivativ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F11/04
Inventor 王志伟麦穗海马金星周骅梅晓洁于鸿光何磊吴志超
Owner TONGJI UNIV
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