Sludge slight expansion actuating apparatus and method of anoxia/aerobic biological denitrification process

A technology of aerobic organisms and starting devices, which is applied in the direction of aerobic and anaerobic treatment, can solve the problems of less aeration and energy consumption, and achieve the effects of saving aeration, optimizing treatment effects, and saving power consumption

Inactive Publication Date: 2009-06-17
彭永臻
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a start-up device and method for sludge micro-expansion in the anoxic/aerobic biological denitrification process, to solve the technical problems of how...

Method used

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  • Sludge slight expansion actuating apparatus and method of anoxia/aerobic biological denitrification process
  • Sludge slight expansion actuating apparatus and method of anoxia/aerobic biological denitrification process
  • Sludge slight expansion actuating apparatus and method of anoxia/aerobic biological denitrification process

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Embodiment 1

[0042] figure 2 It shows the change trend of sludge settling property by using the method of starting sludge micro-expansion solely by low dissolved oxygen, and by suddenly reducing dissolved oxygen. Example 1: Within a week when DO was 2.0mg / L, SVI was around 160mL / g; DO decreased to 0.5mg / L, and SVI rose from 158mL / g to 223mL / g after 7 days, and then SVI did not continue to rise , basically maintained at 190mL / g for 20 days.

[0043] Anoxic and aerobic biological denitrification system is used to start sludge micro-expansion, the raw water is campus domestic sewage, the concentration of mixed liquid suspended solids (MLSS) in the aeration tank is maintained between 2500 and 3500mg / L, and the average temperature of the reactor is 25°C. The internal circulation ratio is 150%, and the sludge return ratio is 100%. The volume ratio of the anoxic zone and the aerobic zone is 1:5, the hydraulic retention time is controlled for 7 hours, and the COD-sludge load is basically maintai...

Embodiment 2

[0045] image 3 It shows the change trend of sludge settling property by starting the sludge micro-expansion only relying on low dissolved oxygen and gradually reducing the dissolved oxygen concentration. Example 2: DO gradually decreased from 2.0 mg / L to 1.0, 0.5, 0.3 mg / L. When the DO is 2.0mg / L and 1.0mg / L, the SVI value of the sludge is below 170mL / g; when the DO is reduced to 0.5mg / L, the SVI begins to rise gradually, up to 217mL / g, and mostly maintained at 190mL / g or less; DO decreased to 0.3mg / L, and the SVI value did not increase significantly.

[0046] The anoxic and aerobic biological denitrification system (as shown in Figure 1) is used to start the micro-expansion of the sludge, the raw water is the domestic sewage in the campus, and the mixed liquid suspended solids concentration (MLSS) in the aeration tank is maintained between 2500 and 3500 mg / L. The average temperature of the reactor is 25°C, the internal circulation ratio is 150%, and the sludge return rati...

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Abstract

The invention provides a device and a method for starting micro expansion of sludge in the anoxic/aerobic biological denitrification process, and belongs to the technical field of sewage treatment. The method is characterized in that in an anoxic/aerobic biological denitrification system, the micro expansion of the sludge is started, the micro expansion of the sludge is controlled within a certain limit, treatment effects are optimized and energy consumption is saved. The proposal of starting the micro expansion of the sludge in the anoxic/aerobic biological denitrification system comprises: 1, triggering the micro expansion of the sludge only by low dissolved oxygen, and including two starting modes for gradually lowering the dissolved oxygen concentration and suddenly lowering the dissolved oxygen concentration; and 2, starting the micro expansion of the sludge in the mode of the low dissolved oxygen combined with the low load. The device and the method are mainly used to optimize operational effects of the anoxic/aerobic biological denitrification sewage treatment system, namely under the conditions of lowering the dissolved oxygen concentration, saving aeration rate and saving energy, the pollutant-removing rate is ensured to meet the standards, and simultaneously the concentration of effluent suspended matters is greatly reduced.

Description

technical field [0001] The invention relates to a sewage biological treatment device and method, in particular to a device and method for realizing sewage treatment by using the characteristics of filamentous bacteria. Background technique [0002] Anoxic / aerobic biological denitrification process, referred to as A / O (Anoxic / Oxic) biological denitrification process, also known as pre-denitrification biological denitrification process, is a well-known sewage treatment process, which is different from traditional multi-stage biological denitrification process. Compared with the denitrification process, it has many advantages, and it is the most widely used denitrification process in urban sewage plants in my country. It is characterized in that the pre-denitrification operates under anoxic conditions, and the removal of carbon-containing organic matter and the nitrification of ammonia nitrogen operate under aerobic conditions. However, with the rapid development of my country'...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 彭永臻郭建华郑雅楠刘洋马宁平孙治荣王淑莹
Owner 彭永臻
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