Multistage method and equipment for wastewater treatment

Abstract

The invention provides a multistage method for removing nitrogen and / or phosphorus from wastewater and equipment for the method. Fed wastewater is subjected to aeration or biological treatment in a flow channel in the process of passing through an aeration unit and a non-aeration unit of a reactor. The reactor is provided with at least two inlets used for introducing the fed wastewater and at least two outlets for draining the treated wastewater, and the inlets are the outlets are spaced according to the length of the reactor. The wastewater flow passes through the reactor in a push-flow mode on the whole, introducing of the fed wastewater is changed from one inlet to the other inlet, and vice versa; draining of the treated water is changed from one outlet to the other outlet, and vice versa. Thus, a technology which is lower in price and more efficient is provided for purifying the wastewater.

Description

technical field [0001] The present invention relates to a multi-stage process for the removal of nitrogen and / or phosphorus from wastewater in a treatment plant wherein the waste-water feed is aerated and biologically treated during passage through a reactor flow path , and to a processing device for performing such a method. [0002] In this connection, the term "wastewater" refers to all kinds of sewage containing organic matter and nutrients (e.g., nitrogen and phosphorus-containing compounds), such as domestic waste water, municipal waste water, sewer sewage, industrial waste water, underground and surface runoff water etc., and their mixtures. Background technique [0003] Due to population growth and urbanization worldwide, the production of used and therefore often polluted water has rapidly increased and sewage treatment has become a major social problem worldwide. The reason polluted water has become such a big problem is the ability of sewage to alter discharge i...

AI Technical Summary

Problems solved by technology

[0017] Therefore, at present, the advantageous concentration gradients theoretically obtainable in plug flow reactors cannot be realized in practice, and neither can the reliable process control that can be achieved by fully mixed SBR equipment, where the concentration remains at the same level throughout the reactor volume, which makes it possible to obtain representative dynamic information

Furthermore, small concentration variations within fully mixed equipment lead to unfavorable sludge properties

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