A method to improve the long-term tolerance of anammox sludge to low-dose oxytetracycline

Abstract

The invention discloses a method for improving long-term tolerance to low dose of doxycycline of anammox sludge. The method comprises the following steps: adding oxytetracycline with the final concentration of 0.1 to 2 mg.L<-1> by adopting an upflow anaerobic sludge bed reactor when the concentration deviation of nitrite nitrogen in outlet water is within 10 percent in 1 to 3 days continuously, continuing operating, taking out anammox sludge with the volume of 0.01 to 2 percent of that of the inoculated sludge from the reactor when the concentration of the nitrite nitrogen in the outlet wateris higher than 10 mg.L<-1> in continuous 1 to 3 days, adding equal amount of fresh anammox sludge particle sludge, taking out the anammox sludge and adding the fresh anammox sludge particle sludge repeatedly, and operating until the concentration of the nitrite nitrogen in the outlet water of the reactor is recovered to the state before the doxycycline is added to obtain the anammox sludge which tolerates the low dose of the doxycycline in long term. According to the method, the performance of resisting long-term low-dose doxycycline disturbance of an anaerobic sludge reactor can be reinforcedin a mode of enhancing and compounding an equal volume sludge discharging strategy by adopting biology, and the stability of doxycycline disturbance resistance of the reactor is enhanced.

Description

[0001] (1) Technical field [0002] The invention relates to a method for improving the long-term and low-dose oxytetracycline disturbance performance of an anaerobic ammonium oxidation process, which belongs to the field of wastewater treatment. [0003] (2) Background technology [0004] Anammox bacteria can catalyze the biological reaction of ammonia and nitrite under anaerobic conditions to generate nitrogen and realize denitrification. The anammox process uses anammox bacteria as functional bacteria, a new type of biological denitrification technology with high denitrification load and low operating cost, and has a good application prospect. [0005] However, autotrophic anammox bacteria grow slowly, with a doubling time of up to 11 days and are sensitive to environmental conditions. At the same time, oxytetracycline, as a broad-spectrum, high-efficiency, and cheap veterinary antibiotic drug, widely exists in high-ammonia nitrogen wastewater such as oxytetracycline produc...

AI Technical Summary

Problems solved by technology

When using the anammox process to treat the above-mentioned high-ammonia nitrogen wastewater, the oxytetracycline in the wastewater will inevitably inhibit the process and functional microorganisms, causing the anaerobic ammonium oxidation process to encounter long-term, low-dose oxytetracycline When the content of wastewater is disturbed, the process performance will be unstable or even difficult to recover due to the damage of functional microbial activity