Membrane bioreactor effluent treatment process for increasing denitrification effect

Abstract

The invention discloses a sewage treatment technique for a membrane bioreactor, which can improve denitrification effect. The technique includes the steps that raw water enters an anoxic zone of a reactor; mixed liquid in the anoxic zone is sent to a simultaneous nitrification and denitrification (SND) zone in the reactor by a pump for the SND reaction; part of the mixed liquid in the SND zone is sent to a membrane zone, which is provided with a membrane component, of the reactor by a first overflow port while part of the mixed liquid returns to a facultative zone of the reactor by a siphon with a flowmeter; part of the mixed liquid in the membrane zone of the reactor is discharged after the filtering and purifying by the membrane component and part of the mixed liquid in the membrane zone returns to a facultative zone of the reactor by a second overflow port; the mixed liquid entering the facultative zone releases dissolved oxygen in the zone and then enters the anoxic zone by a third overflow port arranged in the facultative zone for the denitrification reaction. The technique has the advantages of improving the total nitrogen removal rate and the denitrification efficiency and saving the energy.

Description

technical field [0001] The patent of the present invention relates to a membrane bioreactor process for sewage treatment, especially a membrane bioreactor sewage treatment process with the function of removing total nitrogen. Background technique [0002] Membrane bioreactor (MBR) denitrification process is a process that combines membrane bioreactor (MBR) with aerobic nitrification and anoxic denitrification process. This process usually adds membrane modules in the aerobic section , to ensure the growth of nitrifying bacteria, to achieve the purpose of nitrification, and set an anoxic section before the aerobic section, and the sludge mixture in the aerobic section returns to this point, and mixes with the raw water entering this section, and utilizes the organic matter in the raw water As a carbon source and electron donor, it achieves the purpose of anoxic denitrification. However, the existing process often has some defects during operation, such as: first, the mixed s...

AI Technical Summary

Problems solved by technology

However, the existing process often has some defects during operation, such as: first, the mixed solution in the aerobic zone is directly returned to the anoxic zone, and the dissolved oxygen at the water inlet of the anoxic zone is likely to be too high, which makes the anoxic environment affected. destroy

Second, the NO in the MBR aerobic pool 3 - Denitrification to N 2 Therefore, in the anoxic section, organic matter as a carbon source is likely to become a limiting factor for denitrification, affecting the removal rate of total nitrogen (TN) in sewage

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