Method for degrading fluoroquinolone antibiotics in sludge through pyrohydrolysis pretreatment and anaerobic digestion

Abstract

The invention discloses a method for degrading fluoroquinolone antibiotics in sludge through pyrohydrolysis pretreatment and anaerobic digestion, comprising the following steps: (1) pyrohydrolysis pretreatment: 70 grams of dewatered sludge is added into a 100-milliliter inner container made from polytetrafluoroethylene, and the inner container is put into a reaction kettle; the thermocouple of a digital thermometer is attached on the outer surface of the reaction kettle, and the temperature of the outer surface is detected on line; a reaction tank is put into an oven of which the temperature is set to be 120-180 DEG C, the tank is taken out after 180min, and the tank is cooled down to the indoor temperature, and then the tank body is opened for sampling; (2) dissolving out organic matter: a sample subjected to the pyrohydrolysis pretreatment generates dissolved organic matter; (3) anaerobic digestion: the standing time of the sludge subjected to the pyrohydrolysis pretreatment is controlled to be 12-16 days, and the gas production rate and the total gas production rate are monitored; under the test condition of the abovementioned steps, the degradation of the fluoroquinolone antibiotics is realized. The method can enhance the hydrolysis effect and shorten the hydrolysis time to improve the anaerobic digestion performance of the sludge, accelerate the gas generation rate and increase the methane yield, thereby improving the degradation of the antibiotics in the sludge.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a thermal hydrolysis pretreatment anaerobic digestion method for degrading fluoroquinolone antibiotics in sludge. Background technique [0002] The full name of PPCPs is pharmaceutical and personal care products (pharmaceutical and personal care products), which includes a variety of chemical substances, such as antibiotics, steroids, tranquilizers, painkillers, contraceptives, fragrances, cosmetics, hair dyes, etc. Although the half-life of some PPCPs is not very long, due to the frequent use of people in life and animal husbandry, they are excreted in the form of prototype or metabolites with excreta such as feces and urine, which will cause the accumulation of PPCPs in the environment. Although the residual concentration of PPCPs in the environment is not high, they are widely distributed and have complex and diverse components. Long-term low-dose exposure will...

AI Technical Summary

Problems solved by technology

In addition, in the traditional sludge anaerobic digestion process, the hydrolysis rate of microbial cell walls and cell membranes is slow, and the hydrolysis stage becomes the rate-limiting step of sludge anaerobic biochemical degradation, resulting in long residence time (20 ~30d), low load, slow gas production rate, low treatment efficiency (VS removal rate 30-40%), low gas production

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