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Aerobic granular sludge with strengthened inner core and strengthened framework, and culture method thereof

A technology of aerobic granular sludge and cultivation method, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the problem of unstable aerobic granular sludge, etc. To achieve the effect of short culture period, strong stability and enhanced strength

Pending Publication Date: 2021-04-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Recent studies have shown that the formation of aerobic granular sludge can be accelerated by adding activated carbon particles, zeolite particles, activated carbon fibers and dried sludge. carrier, but during long-term operation, it cannot solve the instability problem of aerobic granular sludge

Method used

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  • Aerobic granular sludge with strengthened inner core and strengthened framework, and culture method thereof
  • Aerobic granular sludge with strengthened inner core and strengthened framework, and culture method thereof
  • Aerobic granular sludge with strengthened inner core and strengthened framework, and culture method thereof

Examples

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Effect test

Embodiment 1

[0026] Inoculate 5,400 mg / L of activated sludge and 200,000 microcarriers / L in the reactor (height-to-diameter ratio: 10:1), control the reaction temperature at 25°C, pH=7.5-8.5, and the surface air velocity in the aeration stage is 0.8cm / s, DO≥4.0mg / L. The batch instruction cycle is 6 hours, including water inflow for 5 minutes, anaerobic stirring for 2 hours, aeration for 2 hours, anoxic stirring for 1 hour 20 minutes to 1 hour 47 minutes, precipitation for 30 minutes to 3 minutes, drainage and idle time for 5 minutes. Artificially prepared municipal sewage (ammonia nitrogen 60-70mg / L, TP 4-6mg / L, COD 250-320mg / L) was used for cultivation. On the 25th day, the granular sludge with a particle size greater than 200um in the reactor Occupying the main body of the reactor, the particle size is between 0.6 and 1.0 mm, and has good sedimentation properties. The removal rates of COD and ammonia nitrogen are above 90%, and the removal rates of total nitrogen are above 75%.

Embodiment 2

[0028] Inoculate 4000mg / L of activated sludge and 250,000 microcarriers / L in the reactor (height-to-diameter ratio: 10:1), control the reaction temperature at 25°C, surface gas velocity at 1.0cm / s, DO≥4.0mg / L , pH=7.5~8.5. The ordering period is 8 hours, including water inflow for 5 minutes, anaerobic stirring for 2 hours, aeration for 2.5 hours, anoxic stirring for 2 hours 50 minutes to 3 hours 17 minutes, precipitation for 30 minutes to 3 minutes, drainage and idle time for 5 minutes. Artificially prepared municipal sewage (ammonia nitrogen 60-70mg / L, TP 4-6mg / L, COD 250-320mg / L) was used for cultivation. On the 27th day, the granular sludge with a particle size greater than 200um in the reactor Occupying the main body of the reactor, the particle size is between 0.5 and 1.7 mm, and has good sedimentation properties. The removal rates of COD and ammonia nitrogen are above 90%, and the removal rates of total nitrogen are above 75%.

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Abstract

The invention discloses aerobic granular sludge with a reinforced inner core and a reinforced framework, and a culture method thereof, belonging to the technical field of sewage treatment methods. According to the invention, a microcarrier is added into a common activated sludge sewage treatment system for culture to obtain aerobic granular sludge with the reinforced inner core and the reinforced framework. Thus, the culture period of the aerobic granular sludge is shortened; and the problem of instability of the aerobic granular sludge in a long-term operation process is solved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment methods, and in particular relates to an aerobic granular sludge with strengthened inner core and skeleton and a cultivation method thereof. Background technique [0002] Aerobic granular sludge (aerobic granular sludge) is formed by microbial self-flocculation, which has the advantages of good settling property, large biomass, and strong impact load resistance. Due to the unique structure of aerobic granular sludge, there are different redox environments inside it, from internal anaerobic, anoxic in the middle to external aerobic, which allows the presence of non-functioning particles in aerobic granular sludge. Therefore, it is possible to achieve simultaneous denitrification, decarburization and phosphorus removal in the aerobic granular sludge process. Since the aerobic granular sludge process was developed, it is considered to be one of the most promising new treatment technologies ...

Claims

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Application Information

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IPC IPC(8): C02F3/10
CPCC02F3/104C02F3/108C02F3/109C02F2203/004Y02W10/10
Inventor 李军梁东博李东岳丁凡吴耀东张晶李培麟
Owner BEIJING UNIV OF TECH
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