Process for clarifying fish-farming sewage with electro-coagulation air flotation method

Abstract

The invention relates to a process for clarifying fish-farming sewage with an electro-coagulation air flotation method. The process comprises the following steps: (1) fish-farming sewage is introduced into an electro-coagulation air flotation reaction tank; current density is 0.15-0.20A/dm<2>, and electrolysis time is 20-30min; dirt produced by air flotation separation is regularly discharged from a water discharge port in the upper part of the tank body; (2) a flocculation solution produced under the effect of an electrochemical reaction is delivered through a precipitation reaction tank and is subjected to solid-liquid separation, wherein a precipitation time is 15-25min; precipitate is accumulated at the bottom and is discharged together; and a supernatant which is the clarified solution is returned to a fish-farming tank. The structure of the electro-coagulation air flotation reaction tank is as the follows: an insulation positioning strip is arranged on the bottom of the tank body; the positioning strip is provided with recesses; a plurality of pole plates are suspended on the wall of the tank; the lower parts of the pole plates are divided by using the positioning strip recesses; and the pole plates are connected with a mono-polar parallel connection method. The precipitation reaction tank has the following structure: a support is fixed on the wall or bottom of the tank; and a plurality of inclined tube fillers are uniformly arranged on the support, wherein the space between the tank bottom and the inclined tube fillers is 300-350mm, and a tilt angle of the inclined tube fillers relative to the water level is 50-60 DEG. The filling rate of the inclined tube fillers filling the space above the support of the precipitation reaction tank is 65-80%.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a process for purifying fish farming sewage by electrocoagulation air flotation. Background technique [0002] For a long time, the traditional extensive management and resource-dependent production mode, which has been the main production mode of aquaculture in my country, has seriously polluted the aquaculture waters and destroyed the aquaculture ecological environment, and has been increasingly threatened by the polluted environment, which has greatly affected the further development of my country's aquaculture industry. . The pollution-free closed recirculating aquaculture model is not restricted by the external natural environment, saves water and land, and can carry out large-scale production under human control conditions. It is an inevitable trend for the sustainable development of aquaculture, but high investment and operating costs have become The b...

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Problems solved by technology

[0002] For a long time, the traditional extensive management and resource-dependent production mode, which has been the main production mode of aquaculture in my country, has seriously polluted the aquaculture waters and damaged the aquaculture ecological environment, and has been increasingly subjected to abuse. The threat of polluting the environment has greatly affected the further development of my country's

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