Method for promoting granulation of flocculent activated sludge by applying nano magnet

Abstract

The invention relates to a method for promoting the granulation of flocculent activated sludge by applying nano magnet. The method comprises the following steps: mixing the flocculent activated sludge, the nano magnet and sewage; promoting the granulation of the flocculent activated sludge by interaction between the nanodots and the flocculent activated sludge; performing the granulation process at room temperature according to a cycle, and sufficiently aerating within each cycle. According to the method disclosed by the invention, the granulation process of the activated sludge can be effectively shortened; by adding a small amount of the nano magnet, the granulation time of the sludge can be effectively shortened and the cost is low; in addition, obtained particles are denser and better in stability. The method disclosed by the invention has the advantages of simple process, mild reaction conditions, safety and no toxicity to environment and facilitation for engineering application; the method can be performed at normal temperature and normal pressure.

Description

technical field [0001] The invention relates to a method for promoting the granulation of flocculent activated sludge by using a nanometer magnet, which belongs to the technical field of environmental chemistry and waste water treatment. Background technique [0002] Aerobic granular sludge is a special form of microbial immobilization technology and a new wastewater biological treatment technology that has emerged in recent years. Aerobic granular sludge is a compact and regular biological aggregate formed by activated sludge microorganisms through self-fixation. Compared with flocculent activated sludge, aerobic granular sludge has the advantages of dense structure, excellent settling performance, and diverse microbial populations, etc. It has high tolerance to shock loads, toxic substances, and heavy metals, and is It has a good treatment effect on refractory pollutants; using aerobic granular sludge to treat sewage in a sequencing batch reactor does not require secondar...

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Problems solved by technology

For example, the Chinese patent document CN105731640A discloses a magnetite-enhanced bio-electrode coupled UASB device and its operating method; the invention strengthens the direct electron transfer between microorganisms and electrodes by adding magnetite nanoparticles, and finally realizes anaerobic biological Rapid start-up of the reactor, sludge granulation, and improved production capacity; however, this invention combines the combined effects of the electric field and magnetite, which is cumbersome, and the amount of magnetite is large and the cost is high

As another example, Chinese patent document CN106396093A discloses a method for promoting activated sludge granulation, adding modified nanospheres to the activated sludge system to promote sludge granulation; modified nanospheres are composed of surfactants, NaOH, aqueous solution, tetraethyl orthosilicate and iso-silicon source are prepared as main raw materials; the modified nanosphere can accelerate the process of granulation and promote the continuous growth of granular sludge; but the preparation method of the modified nanosphere in this invention It is cumbersome, and the amount of modified nanospheres is large, and the cost is high

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