With the rapid development of freshwater aquaculture, intensive industrialized farming is expanding. At the same time, the treatment of aquaculture wastewater emissions will lead to the frequent occurrence of lake eutrophication and large-scale disease, water pollution is becoming more serious, freshwater aquaculture environment deterioration has become the main factors restricting the freshwater aquaculture. At present, we mainly use the conventional biological treatment of aquaculture wastewater. The purpose is to reduce the content of organic matter in aquaculture wastewater, and chemical consumption oxygen demand (COD) as an index, but biological method under the condition of low temperature treatment is difficult to meet the requirements, so in front of the process need pretreatment. Bentonite is a kind of natural clay mineral material with abundant reserves and low price. It has the characteristics of good dispersing property, small particle size, large specific surface area and so on.

Will bentonite as raw material, with 8 hydroxyquinoline as modifier prepared a new, low-cost and green adsorption agent, used for aquaculture wastewater pretreatment can reduce the load of the follow-up process, the aquaculture wastewater purification can be part of the recycling or discharge.

1 part of the experiment

1.1 experimental raw materials

Sodium based bentonite: the experimental results of Na bentonite are taken from Liaoning black mountain, the expansion ratio is 15 times, the colloid value is 100Ml/17g, the cation exchange capacity is 62mmol/100g, the absorption blue amount is 24.58g/100g.

Aquaculture wastewater: wastewater from a wastewater treatment plant in Shenyang province. Its COD up to PH=7.2~7.8, 2500~2700mg/L.

1.2 laboratory instruments and medicines

Instruments: digital water bath HH-4, JJ-4 digital six contact electric mixer, stirring speed controller, high speed universal grinder, microwave oven, Starter3C type precise acidimeter, drb200 cod digestion device, dr5000 multi parameter water quality analyzer, DHG29240A type blast electric thermostatic drying oven, electric sub scales.

Drug: sodium chloride, sodium hydroxide, ethanol, 8- hydroxyquinoline, potassium dichromate, silver sulfate and sulfuric acid.

1.3 experimental methods

Optimization of preparation conditions of bentonite modified by 1.3.1 eight

Said take proper amount of sodium base bentonite, add a certain concentration of 8 hydroxyquinoline modifier, stir into the suspension, soaked for a certain period of time, to a certain temperature in the constant temperature water bath heating and stirring. Finally, after drying, grinding, screening +): mesh, of modified bentonite.