ES2388226A1 - Anoxic denitrifier of depressed wastewater (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Anoxic de-nitrifier of purified wastewater. It comprises: a reactor (1) fed in its lower part by a flow of purified wastewater, with nitrate charge, through a first conduit (3), where the reactor (1) is closed to prevent the entry of light and of oxygen, said reactor (1) provided with an inert bed (2) for receiving and retaining heterotrophic anaerobic bacteria to produce the denitrification of the treated wastewater, during its upward advance through the inert bed (2), avoiding the dragging of bacteria by wastewater; a second duct (4) located in the upper part of the reactor (1), to allow the exit of wastewater with reduced concentration of nitrates; a third conduit (5) for the exit of gaseous nitrogen obtained by denitrification; and a fourth conduit (6) for dislodging sludge from the bottom of the reactor (1). (Machine-translation by Google Translate, not legally binding)

Description

ANOXY DENITRIFIER OF CLEAN WASTEWATER

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OBJECT OF THE INVENTION

1st

The present invention can be included within the technical field of wastewater purification, more specifically the reduction of excess nitrates present in the wastewater once purified. The object of the invention relates to an anoxic denitrifier of purified wastewater.

BACKGROUND OF THE INVENTION

15 2nd

The anoxic denitrification consists of a process of biological transformation of nitrogen by means of the transformation of nitrates (N03) and nitrites (N02), present in an aquatic environment, to free nitrogen (N2), through the intervention of facultative anaerobic bacteria, which can perform their metabolic function without the need to find dissolved oxygen in their environment, being able to obtain said oxygen from the nitrates present, through denitrification reactions. As a consequence of these reactions, nitrogen gas is released into the atmosphere and biodegradable organic carbon is consumed.

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In synthesis, the sequence of reactions that are chained in the process, to achieve the reduction of nitrates to nitrogen gas, occurs in serial stages performed by different organisms according to the following scheme.

There are currently various denitrification systems associated with wastewater treatment processes, whether they are anoxic reservoir,

reverse osmosis, compact, wetlands, etc. However, these systems

they present a series of drawbacks, among which the

following:

-the optional anaerobic bacteria used are carried away by the

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treated water flow;

-They are accompanied by a high production of digested sludge, which

decreases the performance of denitrification procedures;

- they present low yields.

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The mentioned technical problems can be solved by

use of an "anoxic denitrifier" for purified wastewater that

guarantees the maintenance of the bacterial population, a lower production of

digested sludge and higher yield

fifteen

DESCRIPTION OF THE INVENTION

The present invention solves the technical problem posed by

of an anoxic and afotic denitrifier of upward vertical flow, for

denitrify purified wastewater, as described below:

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The anoxic denitrifier is an afotic vertical flow system

ascending, which allows denitrification of purified wastewater. He

system consists of a closed reactor provided with an inert bed for

withstand populations of heterotrophic anaerobic bacteria. Bacteria is

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installed in said bed as a result of a wastewater influent

purified, but still loaded with nitrates, which is introduced into the denitrifier to

through an inlet conduit disposed in the bottom of the reactor.

Preferably, the inert bed has a particle size

uniform, to avoid the existence, along the same, of areas with different

3rd

resistance to the passage of residual water, being the materials that constitute it:

gravel, ceramic, clay, plastics, etc., which allows the

   bacteria take root in the bed and are not dragged by the influent.

The operation of the denitrifier of the invention occurs after the

injection of a constant flow of purified wastewater through the

inlet duct, which is distributed evenly upwards to

through the inert bed.

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As a result of being a closed reactor, a

anoxic and afotic environment, which prevents the growth of algae inside, as well

as the entry of oxygen, thus preventing its absorption by the

influent

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The denitrifier of the invention is a highly versatile system, in

as to the type of influents of wastewater that you can treat, since it works

both for inorganic wastewater and for wastewater with

Different organic concentrations. In the case of unloaded wastewater

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organic, the contribution of a carbon source is used to ensure the

viability of bacteria, which is achieved through the controlled contribution of

Carbon needed from an external medium.

From the top of the denitrifier both the output of the

2nd

denitrified wastewater, once nitrate levels have been reduced, such as

of gaseous nitrogen, while the sludge produced, (decreased

substantially its quantity, due to the absence of algae and the increase in

performance of the denitrifier), are evicted from the bottom.

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A valve can be included on the top of the denitrifier

venting and a volumetric counter to control the performance of the denitrifier,

expressed in volume of nitrogen obtained in relation to the volume of influent

   treaty.

DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical implementation thereof, a set of drawings is attached as an integral part of said description. where, for illustrative and non-limiting purposes, the following has been represented:

Figure 1.- Shows a scheme of the denitrifier according to the invention.

PREFERRED EMBODIMENT OF THE INVENTION

The anoxic wastewater denitrifier of the invention comprises an opaque closed reactor (1) in which an inert bed (2) of uniform granulometry is arranged to support populations of heterotrophic anaerobic bacteria. Through a first duct (3) disposed in the lower part of the reactor (1), the purified waste water that still contains nitrate charges is introduced.

The wastewater is distributed into the reactor (1) by means of distribution (7) according to a constant flow and is distributed uniformly from the bottom of the reactor (1) upwards through the inert bed (2).

The closed and opaque reactor (1) prevents the entry of light and oxygen, thereby preventing the growth of algae inside the reactor (1), consequently raising the performance of the device.

In the event that the wastewater does not contain an organic load, 3 or a contribution means (8) are provided to provide an external controlled supply of a carbon source to ensure the viability of the bacteria.

A second duct (4) for the outlet of the denitrified wastewater is disposed in the upper part of the denitrifier, once nitrate levels have been reduced, as well as a third duct (5) for the output of the obtained nitrogen gas, while the sludge produced during the process leaves

s dislodging from the bottom through fourth ducts (6).

A vent valve (9) and a volumetric counter (1 O) can be included in the upper part of the denitrifier to control the performance of the denitrifier.

Claims (4)

1.-Anoxic denitrifier of purified wastewater, characterized

because it includes:

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-a reactor (1) fed in its lower part by a water flow

purified waste, with nitrate loading, through a first duct (3),

where the reactor (1) is closed to prevent the entry of light and oxygen,

said reactor (1) provided with an inert bed (2) to house and retain bacteria

heterotrophic anaerobes to produce denitrification of wastewater

1st

purified, during its upward advance through the inert bed (2), avoiding

the entrainment of bacteria by wastewater;

-a second conduit (4) located at the top of the reactor (1),

to allow the outflow of denitrified wastewater, once reduced

nitrate concentration;

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-a third conduit (5) for the output of gaseous nitrogen obtained

by denitrification; Y

-a fourth conduit (6) to dislodge from the bottom of the reactor (1)

sludge produced during the process.

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2.-Anoxic denitrifier of purified wastewater, in accordance with

claim 1, characterized in that it further comprises

delivery means (7) for distributing waste water into the reactor

(1) according to a constant flow and to distribute said water evenly

residual from the bottom of the reactor (1) upwards through the

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inert bed (2).

3.-Anoxic denitrifier of purified wastewater, in accordance with the

claim 1, characterized in that it further comprises means

of contribution (8) to provide an external controlled contribution from a source of

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carbon to ensure the viability of bacteria in case the water

residual does not contain organic load.

4.-Anoxic denitrifier of purified wastewater, according to claim 1, characterized in that it additionally comprises at the top of the reactor (1) a vent valve (9) and a volumetric counter (1 O) to control the performance of the denitrifier 5.-Anoxic denitrifier of purified wastewater, according to claim 1, characterized in that the inert bed (2) has a uniform particle size. 1 or 6.-Anoxic denitrifier of purified waste water, according to any one of claims 1 or 5, characterized in that the inert bed (2) is composed of at least one material selected from: -gravel,-ceramic materials, 15 -clay materials, and -plastic materials.