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Method for cultivating aerobic short-cut nitrification granular sludge for treating domestic sewage

An aerobic granular sludge and domestic sewage technology, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., can solve the problems of small footprint, unstable nitrosation, and low operating efficiency , to achieve the effect of increasing the proportion, solving poor settlement performance and broad market application prospects

Active Publication Date: 2011-05-04
BEIJING DRAINAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of cultivation method and fuzzy control device and method thereof for treating domestic sewage nitrosation aerobic granular sludge, thereby improve ammonia oxidizing bacteria content, inhibit the growth of nitrite nitrogen oxidizing bacteria, increase volume load, shorten Nitrification reaction time, reduce cost; greatly improve the settling performance of sludge, shorten settling time, reduce floor area; solve the problems of time program control, low operating efficiency, and unstable nitrosation in the existing sewage treatment system

Method used

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  • Method for cultivating aerobic short-cut nitrification granular sludge for treating domestic sewage

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Embodiment 1

[0036] 1. Cultivation of domestic sewage nitrosation aerobic granular sludge

[0037] Such as figure 1 As shown, the SBR reactor for cultivating nitrosated aerobic granular sludge is cylindrical, with a diameter of 9 cm, an effective height of 90 cm, a height-to-diameter ratio of 10, and a total effective volume of 6 L. It is made of organic glass, and the drain pipe 6 is located under the reactor. / 3, the volume exchange rate is 67%. Use temperature sensor 14, temperature measuring instrument 17, actuator 21 and heating equipment 28 to regulate and control water temperature at 25 ± 1 ℃. The remaining sludge discharged from the secondary sedimentation tank of an urban sewage treatment plant in a city is used as seed sludge and put into the SBR reactor; the raw water is the actual domestic sewage discharged from a living quarter, with COD of 200-350mg / L, NH 4 + -N is 50~85mg / L, pH value is 7.4~7.8, alkalinity (as CaCO 3 Meter) average value is 380mg / L. The operation mode o...

Embodiment 2

[0065] 1. Cultivation of domestic sewage nitrosation aerobic granular sludge

[0066] Such as Figure 4As shown, the SBAR reactor for cultivating nitrosated aerobic granular sludge is cylindrical, with an outer cylinder diameter of 9cm, an inner cylinder diameter of 5cm, a height of the bottom gap area of ​​15cm, an effective height of 90cm, a height-to-diameter ratio of 10, and a total effective volume of 6L , made of plexiglass, the drain pipe 6 is located in the lower 1 / 3 of the reactor, and the volume exchange rate is 67%. Control the water temperature at 25±1° C. with a temperature sensor 14 , a temperature measuring instrument 17 , an actuator 21 and a heating device 29 . The remaining sludge discharged from the secondary sedimentation tank of an urban sewage treatment plant in a city is used as seed sludge and put into the SBAR reactor; the raw water is the actual domestic sewage discharged from a living quarter, with a COD of 200-350mg / L, NH 4 + -N is 50~85mg / L, pH ...

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Abstract

The invention relates to a method for cultivating aerobic short-cut nitrification granular sludge for treating domestic sewage, which is characterized in that an SBR reactor adopts ratio of height to diameter of 1.8-10 and volume exchange rate of 50-67%; the sedimentation time is 30-50min, which is gradually shortened to 3min, or the sedimentation time is set as 5-8min. In the process of biochemical reaction, dissolved oxygen (DO) and pH value are regarded as real-time control parameters; aeration time is controlled according to the fuzzy control rule; nitrification is controlled to stop on the short-cut nitrification stage. The method can increase the content of ammonia oxidizing bacteria and volume load, shorten nitration reaction time, improve the sedimentation property of the sludge by a wide margin, shorten sedimentation time, narrow the floor area of the reactor and solve the problems of low operating efficiency and unstable nitrosification caused by time program control of the sewage treatment system. The aerobic short-cut nitrification granular sludge prepared by the invention is suitable for treating high-concentration ammonia nitrogen wastewater with low COD and is a biological wastewater treatment technology with broad market prospect.

Description

technical field [0001] The invention relates to a cultivation method for treating domestic sewage nitrosation aerobic granular sludge and a fuzzy control device and method thereof, belonging to the technical field of sewage biological treatment. Background technique [0002] With the development of industrial and agricultural production and the improvement of people's living standards, nitrogen pollution has intensified, not only causing eutrophication of water bodies but also seriously disrupting aquatic ecosystems. In 2002, my country's newly promulgated "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) requires that all urban sewage treatment plant effluents be discharged into rivers with small dilution capacity as urban landscape water and general reuse water, etc., Implement the A standard of the primary standard, that is, TN<15mg / L, NH 4 -N<5mg / L (<8mg / L when the water temperature is lower than 12°C). At present, almost all urba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/20C02F3/12
CPCY02W10/10
Inventor 高景峰陈冉妮彭永臻苏凯张倩
Owner BEIJING DRAINAGE GRP CO LTD
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