Pretreatment technical flow for applying industrial sewage to microalgae aquaculture

Abstract

The invention relates to application of industrial sewage to microalgae aquaculture, in particular to a technical flow for pretreatment of eutrophic industrial sewage. A pretreatment technical flow for applying the industrial sewage to the microalgae aquaculture comprises the following steps: firstly, treating sludge in sewage by a technology of combining inorganic flocculant aluminium potassium sulfate and organic flocculant chitosan, wherein the mass ratio of the aluminium potassium sulfate to the chitosan is 100-200: 1, the molecular weight of the chitosan is 800-2000, and after the flocculants are added, the reaction time is controlled at 2 hours and the sedimentation time is controlled at 24 hours; secondly, adding sodium hydroxide into the treated sewage to regulate the pH value to 9, and filtering the sediment, wherein the sedimentation time is 12-24 hours; and thirdly, removing Cd, Cr, Hg, Pb and other heavy metal ions from water by using a molecular sieve column. The organic impurities are kept in the treated industrial sewage, and the inorganic impurities and the sludge are removed from the industrial sewage, so that the treated industrial sewage is applicable to the microalgae propagation.

Description

technical field [0001] The invention relates to the application of industrial sewage to microalgae cultivation, in particular to the pretreatment technical process for eutrophic industrial sewage. Background technique [0002] The water resource crisis is one of the greatest challenges faced by mankind in the 21st century. With the development of human economic activities, a large amount of nutrients such as nitrogen and phosphorus are discharged into the water body, causing eutrophication of the water body, leading to abnormal reproduction of algae and deterioration of water quality. The water resource crisis is one of the greatest challenges faced by mankind in the 21st century. With the development of human economic activities, a large amount of nutrients such as nitrogen and phosphorus are discharged into the water body, causing eutrophication of the water body, leading to abnormal reproduction of algae and deterioration of water quality. At the same time, 40% of the c...

AI Technical Summary

Problems solved by technology

However, the toxic elements in this kind of sewage, such as Pb, Cr, Cd and Hg, often have relatively high content, and other impurities in the water, such as certain bacterial communities, sludge components, etc., interfere with microalgae cultivation

If such untreated sewage is directly used for microalgae culture, the desired algae species will often die and the unnecessary plant species will overgrow