Blue-green algae sludge treatment method

Abstract

The invention discloses a blue-green algae sludge treatment method. The method comprises the following steps: 1) extracting blue-green algae sludge; 2) crushing hemp stalks, hemp roots, hemp branches and / or the hemp leaves to obtain a powdery hemp powder; 3) stirring and mixing the hemp powder, attapulgite and the blue-green algae sludge, wherein the volume ratio of the hemp powder to the blue algae sludge is (0.15-0.3):1, the weight ratio of the attapulgite to the blue-green algae sludge is (0.1-0.3):1; 4) adding fermentation microorganisms into a stirred mixture obtained in the step 3) for fermentation; 5) drying, screening and filtering a fermented product, wherein one part of the screened and filtered product is hemp powder containing heavy metals, and the other part is an organic matter blue-green algae attapulgite mixture; 6) performing anaerobic carbonization treatment on the hemp powder containing the heavy metals, and extracting the heavy metals; and 7) taking the organic matter blue-green algae and attapulgite mixture as an organic fertilizer. The method provided by the invention greatly reduces the content of heavy metals in the blue-green algae sludge.

Description

technical field [0001] The invention relates to a method for treating algae, in particular to a method for treating cyanobacterial sludge. Background technique [0002] The reason for the blue-green algae outbreak: Waste water is discharged into the water body, resulting in excessive nutrients such as nitrogen and phosphorus. In the season when the light and temperature are suitable, the algae such as blue-green algae in the water reproduce and gather in large numbers. [0003] Harm of cyanobacteria outbreak: (1) The mass reproduction of cyanobacteria consumes dissolved oxygen in water, and at the same time floats on the water surface to block sunlight from projecting underwater. Other algae and aquatic plants cannot survive underwater, which further reduces dissolved oxygen in water, which can lead to a large number of aquatic organisms Death, dead algae, and aquatic animal corpses decompose to make water eutrophic, which seriously threatens the aquatic ecosystem. (2) Dead...

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Problems solved by technology

[0003] Harm of cyanobacteria outbreak: (1) The mass reproduction of cyanobacteria consumes dissolved oxygen in water, and at the same time floats on the water surface to block sunlight from projecting underwater. Other algae and aquatic plants cannot survive underwater, which further reduces dissolved oxygen in water, which can lead to a large number of aquatic organisms Death, dead algae, aquatic animal carcasses make water eutrophication, which seriously threatens the aquatic ecosystem

(2) Dead cyanobacteria will release algal toxins. Water bodies containing a certain concentration of algal toxins can cause fish eggs to mutate and fish to grow abnormally. The outbreak of cyanobacteria blooms seriously affects the health of the water ecological environment.

[0015] However, in the above-mentioned prior art, chemical methods are mainly used for the treatment of heavy metals in cyanobacterial sludge, such as adding CuSO 4 Other algicides and flocculants, the chemical agents added have toxic effects on aquatic organisms, will cause secondary pollution, and the cost is also high

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