FRESHWATER RECIRCULATING AQUACULTURE INSTALLATION

Abstract

Installation for the recirculation of fresh water of the type that includes a pretreatment module for pretreating the water from an aquaculture tank, an oxidation module for the elimination of contaminants and a recirculation of the treated fresh water to the culture tank, after a post-treatment module that also passing through includes an electrochemical module for generating oxidants arranged in an auxiliary line, outside the main line for recirculating the treated fresh water, which is fed by a water recirculation line from the outlet of the post-treatment module, the electrochemical oxidant generation module being decoupled from the oxidation module and in fluid communication with it through an electrogenerated oxidant feed line.

Claims

1. Installation for the recirculation of fresh water of the type that includes a pretreatment module (2) for pretreating the water from an aquaculture tank (1), an oxidation module (3) for the elimination of contaminants and a recirculation (4) of the treated fresh water to the culture tank (1), after passing through a post-treatment module (5), characterized in that it also includes an module for generating oxidants (7) electrochemical arranged in an auxiliary line, outside the main line for recirculating the treated fresh water (4), which is fed by a water recirculation line (6) from the outlet of the post-treatment module (5), the electrochemical oxidant generation module (7) being decoupled from the oxidation module (3) and in fluid communication with it through an electrogenerated oxidant feed line (11).

2. A fresh water recirculation installation according to claim 1, characterized in that the oxidant generation module (7) includes a brine tank (8), as well as a static mixer (9) associated to the electrochemical reactor (10), which provides the electrogenerated oxidants to the oxidation module (3).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This description is complemented with FIG. 1, illustrative of an embodiment of the invention.

[0017] FIG. 1 shows a diagram of a fresh water recirculation installation according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0018] As mentioned, and referring to FIG. 1, the fresh water recirculation installation of the invention is of the type that includes a pretreatment (2) for module pretreating the water from an aquaculture tank (1), an oxidation module (3) for the elimination of contaminants and a recirculation (4) of the treated fresh water to the aquaculture tank (1), after passing through a post-treatment module (5), characterized in that it also includes an oxidant generation module (7) arranged in an auxiliary line, outside the main line for recirculating the treated fresh water (4), which is fed by a water recirculation line (6) from the outlet of the post-treatment module (5), the oxidant generation module (7) being decoupled from the oxidation module (3) and in fluid communication with it through an electrogenerated oxidant feed line (11).

[0019] As can be seen, the oxidant generation module (7) includes a brine tank (8), as well as a static mixer (9) associated to the electrochemical reactor (10), which provides the electrogenerated oxidants to the oxidation module (3).

[0020] The subsequent stage of treatment or degradation of the polluting load takes place in the recirculation line (4) after dosing the electrogenerated oxidants, the reaction being favored by the intimate contact of the reagents as they pass through the oxidation module (3).

[0021] In the installation described here, the dosage of oxidants is adjusted to what is known as breakpoint chlorination, which corresponds to a dose of chlorine such that it allows all the NAT (total ammonia nitrogen) and by-products (chloramines) that may have been formed during the process to be oxidized. In other words, the quantity of oxidants necessary to eliminate the key contaminants is generated by the oxidant generation module (7) described, so as to minimize the amount of residual chlorine in the water and, potentially, reduce the formation of by-products. The increase in salinity of the main line is compensated by introducing a supply and purge current of fresh water intended for cleaning the pre-treatment and post-treatment modules.

[0022] On the other hand, the fact of producing oxidants offline allows optimizing the quantity produced, since it takes place in a controlled environment, as well as adjusting the dosage to the contaminant load present in the fresh water of the line to be treated.