Method for removing antibiotics in sewage through coupling of microorganisms and photocatalysis, and up-conversion/titanium dioxide composite material used therein

Abstract

The invention discloses a method for efficiently removing antibiotics in sewage through coupling of microorganisms and photocatalysis, and an up-conversion/titanium dioxide composite material used therein. The method comprises the following steps: preparation of an up-conversion material: doping Pr and Li on Y2SiO5; loading of titanium dioxide on the up-conversion material; construction of a periphyton-up-conversion-titanium dioxide composite system; and removing tetracycline in the sewage by using a periphyton/up-conversion/titanium dioxide composite system; and removal of tetracycline in sewage by using the periphyton-up-conversion-titanium dioxide composite system. The method disclosed by the invention can be used for efficiently, thoroughly and environmentally-friendly removing antibiotics in sewage, is a low-cost, flexible and easy-to-operate antibiotic removal method, and is suitable for non-point source sewage or municipal sewage with a relatively high antibiotic concentration.The method is remarkable in effect; 82% of tetracycline in the system is degraded after 24 h, and the periphyton still keeps biological activity; and compared with a microbiological method, the methodis more efficient in tetracycline removal, and the tetracycline removal rate is higher than the tetracycline removal rate of the periphyton by about 40% within 24 h.

Description

technical field [0001] The invention belongs to the technical field of biological environment and sewage treatment, and in particular relates to an environmentally friendly, efficient and stable microbial-photocatalytic coupling water treatment technology construction method, which combines a ubiquitous environmental microbial surrounding organism with up-conversion-driven light The coupling of catalytic composite materials can efficiently remove antibiotics in sewage through enhanced photocatalytic degradation, microbial degradation and other coupling effects. The invention also relates to upconversion-titania composites in this method. Background technique [0002] With the abuse of antibiotics in humans and animals, especially the widespread use of antibiotics as growth promoters and disease control drugs mixed in feed, a large number of unused antibiotics enter the environment, causing serious damage to ecological environment safety and human health. Great threat. Anti...

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Problems solved by technology

In the photocatalytic removal method, titanium dioxide has been widely concerned and applied due to its advantages of wide availability and excellent removal effect. However, this method has certain defects, mainly because titanium dioxide can only produce photocatalysis under the excitation of ultraviolet light. , but in practical applications, the ultraviolet light in sunlight has poor permeability, so when titanium dioxide is used to degrade pollutants, an additional ultraviolet light source is required

Not only that, in order to ensure the utilization effect of titanium dioxide on ultraviolet light, the reactor of titanium dioxide will be made as small as possible, or the ultraviolet lamp tube will be covered with the whole reactor. Although these methods improve the degradation effect of pollutants, they will undoubtedly increase the pollution of sewage. processing cost

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