70 results about "Cyanobacteria bloom" patented technology

The invention discloses a preparation method of a modified alga flocculating agent, and an application of the alga flocculating agent in treatment of cyanobacterial bloom. Iron nitrate is fixed to negative polyacrylamide through chemical complexation and physical adsorption technologies. The surface of the modified flocculating agent has many ion properties, so the improved flocculating agent can rapidly remove microcystis. The modified flocculating agent has a good adsorption effect, like high-molecular polymers are commercial products and are cheap and easily available, and the modified flocculating agent has very high stability. The modified flocculating agent also has the advantages of non-toxicity and harmlessness to environment, human and animals, no residual, substantial improvement and purification of culture water environment, effective avoiding of the bursting of the cyanobacterial bloom, and no secondary pollution.

A method for controlling cyanobacteria bloom is characterized in that the method comprises the following steps: A) collecting a water sample of the surface layer of a natural water area where cyanobacteria bloom occurs, allowing the water sample to pass through a microporous membrane, and concentrating the water sample by an ultrafiltration system to obtain a phycophage concentrate; B) preparing a mixed solution of the phycophage concentrate and a log-phase microcystic aeruginosa solution with degradable polyurethane foam as a carrier, adding the mixed solution into a container, adding the carrier simultaneously to fix the phycophage on the carrier; C) adding the carrier into the natural water area where cyanobacteria bloom occurs with an adding amount of the fixed phycophage carrier being 0.5-1 kg per one square meter water area. Compared with the prior art, the invention has the following outstanding advantages: 1) the phycophage obtained from a water area where cyanobacteria bloom occurs has good applicability and stability; 2) the phycophage fixed on the carrier has a high density of biomass and a strong capability to resist noxious material impact, and can maintain high efficiency and activity. 3) the phycophage and the carrier is environment-friendly.

The invention discloses a method for controlling cyanobacteria bloom, which belongs to the technical field of water pollution treatment. The method for controlling the cyanobacteria bloom comprises the steps of: (1) utilizing an acquisition system with a sucking disk to perform suction acquisition on cyanobacteria on the water surface of a water body; (2) pumping cyanobacteria water which is subjected to suction acquisition into a conveying pipeline through a suction pump, and conveying the cyanobacteria water to a storage tank; (3) pumping the cyanobacteria water in the storage tank into a dosing system through a screw pump, adding a flocculating agent into the cyanobacteria water, and mixing evenly to ensure that the cyanobacteria is flocculated; (4) sending the cyanobacteria water withthe flocculated cyanobacteria into a settling separation system for solid-liquid separation to obtain water and cyanobacteria mud with the water content of 80 percent, sending the water obtained after the solid-liquid separation to a clear water tank for temporary storage through the settling separation system, and then draining the water into the water body through an overflow port; and (5) separating the obtained cyanobacteria mud to obtain cyanobacteria mud with the water content less than 70 percent after the drying. The method for controlling the cyanobacteria bloom has the advantages ofenvironmental protection, low cost and convenient operation, and can realize the safe disposal and resource utilization of the cyanobacteria bloom.

The invention discloses a Stenotrophomonas sp. strain and application thereof in controlling cyanobacterial blooms. A strain of Stenotrophomonas sp. Lzh-7 (CGMCC No.6548) having significant algae-lysing activity is isolated from Taihu water body. The fact is identified that the effective algae-lysing component hydroquinone is isolated and purified from the metabolites of the strain, wherein the median lethal dose (LD50) of hydroquinone to Microcystis aeruginosa 9110 is 3.9 Mug / mL and the median lethal dose (LD50) of hydroquinone to Synechococcus BN60 is 6.7 Mug / mL. The Stenotrophomonas sp. strain can be applied to the research, development and production of novel biological algaecides and eventually applied to the control of lake cyanobacterial blooms.