Method for stirring and/or aerating fluids, particularly sewage, particularly using a floodable aerator

Abstract

The invention relates to a method for stirring and / or aerating fluids, particularly sewage, having the following cyclically repeated steps: aerating the fluid by means of an immersed aerator for a predetermined first period of time (t1) using an aeration device (1) disposed on a carrier (3, 43) designed as a floodable hollow body (2, 42), the hollow body (2, 42) being flooded and air being brought into the fluid by the aeration device, whereby the potential for nitrification is created in the fluid; stirring the fluid by means of the immersed aerator for a predetermined second period of time (t2), the air infeed by the aeration device (1) being throttled or turned off, and previously flooded hollow body being evacuated in order to fill the hollow body (2, 42) with gar or air, the immersed aerator assuming the function of mixing device in which fluid rises upward, thus mixing the fluid, where in the potential for denitrification is created in the fluid; and an immersed aerator.

Description

Technical field [0001] The present invention relates to a fluid (especially waste water) stirring method, in particular to a fluid stirring method using an immersed aerator, which has at least one aeration device arranged on a carrier. Background technique [0002] Modern wastewater / sewage plants need to denitrify wastewater to reach the specified upper nitrate value. Nitrogen removal (in other words, dissociation of oxygen attached to nitrates, thereby releasing molecular nitrogen) uses suitable bacteria to go through several biological stages in an oxygen-poor environment (ie, no dissolved oxygen is present in the reactor). [0003] The optimization of hypoxia requires vigorous agitation of biomass (bacteria) and wastewater to increase the interface and accelerate the release of denitrified media, and on the other hand, it requires the presence of degradable carbon compounds. Therefore, first "force" aerobic C degradation-in short, denitrification takes oxygen away from nitrate....

AI Technical Summary

Problems solved by technology

However, this system has the following significant disadvantages: the inflatable buoyancy member, whether uninflated or inflated, adds an unwieldy component in the vicinity of the submersible inflator, and at the same time is susceptible to damage by being punctured by any object so that useless

A particularly thorny issue in safe operation is the "biological" slime that is often present on all surfaces underwater, making them slippery and difficult to handle

This additionally complicates handling of the floating inflator

In addition to this, the aerator and its ancillary equipment are often stressed after being lifted out of the water, so there is a risk of material damage such as hose kinks, broken hose couplings and ruptured aerator membranes

Prolonged operation of a single floating aerator or submerged aerator has the specific disadvantage that the activated sludge in the water zone treated by this submerged aerator becomes unbalanced and will negatively affect the overall biological process influences

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