Abstract: A method for deep dehydration and desiccation of cyanobacteria includes steps of flocculation conditioning, high pressure diaphragm plate-frame pressure filtration, quartz glass box-type desiccation and negative pressure paddle drying.

Abstract: The present disclosure discloses a method for determining ecological risks of polycyclic aromatic hydrocarbon in a water body. The method may include (1) screening representative species of a water ecological system in a region; (2) obtaining toxicity data of benzoapyrene; (3) calculating benzoapyrene concentration values HC5 of 95% of species in the protected water ecological system; (4) determining types of polycyclic aromatic hydrocarbon pollutants and corresponding environmental concentrations thereof by sampling, and analyzing concentration distribution characteristics of various polycyclic aromatic hydrocarbons; (5) calculating ecological risk quotient values RQi of specific polycyclic aromatic hydrocarbon pollutants; and (6) calculating a total ecological risk quotient value RQt and confirming concrete ecological risks.

Abstract: The present disclosure discloses a method for determining ecological risks of heavy metal pollution in sediments of river and lake. The method includes the following steps of: (1) determining concentration levels of heavy metal pollutants at different positions of water body sediments; (2) conducting statistic analysis on distribution characteristics of concentration data of various heavy metal pollutants in the water body sediments; (3) calculating an ecological risk index of a heavy metal pollutant using a formula; (4) calculating a final result of Eri; (5) drawing a distribution curve of Eri values; (6) calculating a total ecological risk comprehensive index HRI caused by various heavy metal pollutants in the evaluated water body, and drawing a cumulative probability distribution curve of HRI values; and (7) analyzing a probability that the total ecological risk comprehensive index HRI of the water body appears at different risk levels with reference to a risk level classification standard.

Abstract: A blade device for a mixing propeller has a rocking shaft and a plurality of blade units. The blade unit is made of a flexible material and is installed on the rocking shaft via a fixing groove. The blade unit includes a horizontal propelling flexible blade and a vertical uplifting flexible blade. The fixing groove has a horizontal section and a vertical section. One end of the horizontal propelling flexible blade is inserted in the vertical section of the fixing groove while the other end of which is kept free so that it can swing back and forth. One end of the vertical uplifting flexible blade is inserted in the horizontal section of the fixing groove while the other end of which is kept free so that it can swing back and forth.

Abstract: A method for deep dehydration and desiccation of cyanobacteria includes steps of flocculation conditioning, high pressure diaphragm plate-frame pressure filtration, quartz glass box-type desiccation and negative pressure paddle drying.

Abstract: The present disclosure discloses a method for determining ecological risks of heavy metal pollution in sediments of river and lake. The method includes the following steps of: (1) determining concentration levels of heavy metal pollutants at different positions of water body sediments; (2) conducting statistic analysis on distribution characteristics of concentration data of various heavy metal pollutants in the water body sediments; (3) calculating an ecological risk index of a heavy metal pollutant using a formula; (4) calculating a final result of Eri; (5) drawing a distribution curve of Eri values; (6) calcualting a total ecological risk comprehensive index HRI caused by various heavy metal pollutants in the evalulated water body, and drawing a cumulative probability distribution curve of HRI values; and (7) analyzing a probability that the total ecological risk comprehensive index HRI of the water body appears at different risk levels with reference to a risk level classification standard.

Abstract: The present invention discloses a blade device for the mixing propeller comprises a rocking shaft and a plurality of blade units; the said blade unit is made of flexible material and is installed on the rocking shaft via the fixing groove; the said blade unit consists of a horizontal propelling flexible blade and a vertical uplifting flexible blade whereas the said fixing groove consists of a horizontal section and a vertical section; one end of the said horizontal propelling flexible blade is inserted in the vertical section of the fixing groove while the other end of which is kept free so that it can swing back and forth; one end of the said vertical uplifting flexible blade is inserted in the horizontal section of the fixing groove while the other end of which is kept free so that it can swing back and forth.

Abstract: The present disclosure discloses a method for determining ecological risks of polycyclic aromatic hydrocarbon in a water body. The method may include (1) screening representative species of a water ecological system in a region; (2) obtaining toxicity data of benzoapyrene; (3) calculating benzoapyrene concentration values HC5 of 95% of species in the protected water ecological system; (4) determining types of polycyclic aromatic hydrocarbon pollutants and corresponding environmental concentrations thereof by sampling, and analyzing concentration distribution characteristics of various polycyclic aromatic hydrocarbons; (5) calculating ecological risk quotient values RQi of specific polycyclic aromatic hydrocarbon pollutants; and (6) calculating a total ecological risk quotient value RQt and confirming concrete ecological risks.