Method and device for culturing AGS (aerobic granular sludge)

Abstract

The invention belongs to the field of wastewater treatment and particularly discloses a method and a device for culturing AGS (aerobic granular sludge). The culture method comprises steps of manual simulation wastewater preparation, inoculation, sludge culture and the like and specifically comprises the steps as follows: traditional activated sludge is taken as inoculated sludge, an SBAR (sequencing batch airlift reactor) is inoculated with the activated sludge after aeration, circulating culture is sequentially performed in a water inlet-aeration-sedimentation-drainage-anaerobic manner, anaerobic granular sludge is added after the sludge is acclimatized and stabilized, crystal nucleuses for inducing growth of aerobes is provided, and the AGS is prepared after a certain period of culture.Compared with AGS obtained through culture of common activated sludge, the AGS has greater advantages in the aspects of granule specific gravity, settling rate and microbial activity.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for cultivating aerobic granular sludge, in particular to a method for using anaerobic granular sludge to induce and cultivate aerobic granular sludge, and a device for cultivating it. Background technique [0002] Aerobic granular sludge (AGS) is between activated sludge and biofilm, but it has higher microbial activity and tolerance than suspended biological filler. It is a new treatment technology in recent years. Compared with flocculent sludge, aerobic granular sludge has excellent settling performance, good treatment effect on organic matter per unit volume, can withstand high impact load, reduces volume requirements for secondary sedimentation tanks, and can simultaneously denitrify The characteristics of phosphorus removal. For the cultivation of aerobic granular sludge, because researchers are based on different methods and experimental conditions, i...

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Problems solved by technology

Since then, researchers have also cultivated similar self-fixing particles in an aerobic state. For example, in the early days, Vander Hoek, De Beer and Van Benthum et al. used carriers to cultivate aerobic granular sludge, and the effect of the particles was not ideal; until In 1991, MishimaI and others cultivated aerobic granular sludge in BAS (Bio-film airlift suspension, continuous airlift reactor), but this was only cultivated under pure oxygen aeration, and the formation conditions were very harsh; 1998 Heijnen and van Loosdrech applied for a patent on aerobic granular sludge in 1990; and by the end of the 1990s, the research and application of aerobic granular sludge was gradually known and accepted with the deepening and extensive research, for example, Van der Hoek Studies have shown that Ca 2+ Can be used as the "crystal nucleus" of aerobic granular sludge, adding Ca 2+ It has a promoting effect on granulation; then in 2010, Liu et al. cultivated aerobic granular sludge in the SBR reactor with real domestic wastewater as the influent in the pilot test in 2010, and in 2012 in the continuous flow biofilm reactor Aerobic granular sludge has also been successfully obtained, but the formed particles are finer, the sedimentation performance is not good, and the structure is not dense

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