43 results about "Raceway pond" patented technology

The invention discloses a raceway pond photobiological reactor for implementing microalgae large-scale culture, which comprises a main raceway pond, an algae liquid spray unit, a stirring system and an algae liquid circulation system, wherein the stirring system comprises a motor and a stirring paddle, and the stirring paddle is arranged in the main raceway pond, so that the algae liquid can flowin the main raceway pond; the algae liquid spray unit is fixed in the main raceway pond through a metal supporting frame, and comprises a sprayer and a transparent curtain wall, the spray is used fordispersing the downflow algae liquid, and the transparent curtain wall is used for preventing the algae liquid from splashing and preventing the algae liquid from contacting the external environment;and the algae liquid circulation system is communicated with the main raceway pond and the algae liquid spray unit, and drives the algae liquid to circulate between the main raceway pond and the algae liquid spray unit. The design scheme of the novel raceway pond photobiological reactor provided by the invention can be used for implementing low-cost high-density culture of microalgae.

A raceway pond for circulating microalgae in a fluid medium includes a plurality of interconnected channels. Each channel is straight and has a structured gradient, due to tilt or terracing, that moves the fluid medium along the raceway. In operation, the concentration of microalgae in the fluid medium is maintained substantially constant, and the depth of the fluid medium in the raceway is maintained below a pre-determined level.

The present invention relates to a method of manipulating the physiological state of algae cultured in raceway ponds by altering one or more environmental parameter to simulate algal bloom forming conditions and to raceway ponds suitable for culturing algae according to the present invention. The alteration of the one or more environmental parameters in a specifically timed manner can be used to induce and maintain synchronous cell division.

The invention discloses a method for cultivating phaeodactylum tricornutum bohlin by virtue of a two-stage process with adoption of waste zip-top cans and a narrow-mouthed bottle, and belongs to the field of aquaculture. In the past, the phaeodactylum tricornutum bohlin, which is always cultivated by virtue of an open raceway pond, has the problems of being high in basic investment, easily polluted, difficult to scrub, inflexible to operate, large in occupied space, greatly affected by seasons in production and unstable. In order to overcome shortcomings of the conventional technology, the invention provides the method for cultivating the phaeodactylum tricornutum bohlin by virtue of the two-stage process with adoption of the waste zip-top cans and the narrow-mouthed bottle; the prescription of a disclosed phaeodactylum tricornutum bohlin nutrient solution is more scientific and reasonable, and the cultivated phaeodactylum tricornutum bohlin is rapid in growth, small in occupied space, low in investment, low in cost, easy to operate, not easily polluted, convenient to scrub and not limited by the seasons in production; the contents of polyunsaturated fatty acids EPA and DHA in phaeodactylum tricornutum bohlin cells are high, electric energy consumption is low and yield is improved by 45%.

The invention discloses a raceway pond photobiological reactor for implementing microalgae large-scale culture, which comprises a main raceway pond, an algae liquid spray unit, a stirring system and an algae liquid circulation system, wherein the stirring system comprises a motor and a stirring paddle, and the stirring paddle is arranged in the main raceway pond, so that the algae liquid can flowin the main raceway pond; the algae liquid spray unit is fixed in the main raceway pond through a metal supporting frame, and comprises a sprayer and a transparent curtain wall, the spray is used fordispersing the downflow algae liquid, and the transparent curtain wall is used for preventing the algae liquid from splashing and preventing the algae liquid from contacting the external environment;and the algae liquid circulation system is communicated with the main raceway pond and the algae liquid spray unit, and drives the algae liquid to circulate between the main raceway pond and the algae liquid spray unit. The design scheme of the novel raceway pond photobiological reactor provided by the invention can be used for implementing low-cost high-density culture of microalgae.

The invention provides a microalgae large-scale culture device suitable for improving carbon fixation efficiency. The microalgae large-scale culture device comprises a raceway pond provided with at least one raceway and a stirring paddle mounted in the raceway pond, wherein the stirring paddle is mounted at one end of the raceway, and algae liquid in the raceway flows through the rotation of the stirring paddle; the microalgae large-scale culture device is characterized by further comprising a plurality of transparent cover plates; the transparent cover plates are discontinuously distributed above the raceway; the bottoms of the transparent cover plates are in contact with the upper surface of the algae liquid. Gas-liquid-cover contact is realized, the gas-liquid contact time is prolonged, and the CO2 dissolving efficiency is improved. An aeration unit in the raceway pond can generate small air bubbles, and the generated air bubbles are not aggregated, so that the CO2 dissolving efficiency is improved; meanwhile, the aeration unit also has the characteristics of smoothness and uneasiness of being blocked, crushing resistance and uneasiness of being crushed; the aeration unit is low in manufacturing cost and easy to mount and maintain, and multi-point discontinuous arrangement can be realized in the raceway pond for large-scale culture.

The invention discloses a harvesting device capable of concentrating microalgae cells in raceway pond by virtue of microbubble backflash. The harvesting device comprises an aeration net, side surface blocking nets, a front surface blocking net and a collecting pipe, wherein the front end of the aeration net faces to the water flow direction and is arranged at the bottom of the raceway pond, and the rear end of the aeration net is connected with the lower part of the front surface blocking net; two sides of the aeration net are connected with the side surface blocking nets, and the side surface blocking nets and the aeration net form alga liquid inlets; the collecting pipe is arranged at the upper end of the front surface blocking net and is detachably connected with a collecting hole of the raceway pond. Compared with an existing preliminary concentration manner of alga cells, the harvesting device has the advantages that (1) the preliminary concentration of the alga cells is effectively realized in real time, less time is consumed in the whole link, and the problems of bacterium breeding, biomass loss and the like are avoided; (2) the energy consumption is avoided, the structure is simple, and the assembly and disassembly are convenient; (3) the cost is low, the manufacturing is easy, the efficiency is high, and the production cost of large-scale culture of microalgae is beneficially lowered.

The invention discloses a multidirectional-turbulence and efficient-mixing novel runway pond microalgae cultivation system which comprises a runway pond. A turbulence carbon dioxide supplement device, an algae cell harvesting device utilizing microbubble back flushing, a flow retaining device and two paddle wheels are disposed in the runway pond, and a groove structure is disposed below each paddle wheel. The multidirectional-turbulence and efficient-mixing novel runway pond microalgae cultivation system is communicated with an algae cell settling pond, a disinfecting pond and a nutritive salt blending pond. The multidirectional-turbulence and efficient-mixing novel runway pond microalgae cultivation system has the advantages that water circulation in the runway pond can be accelerated, and air exchanging frequency between liquid surface and atmosphere is increased; primary concentration of algae cells can be achieved in real time and effectively, and centrifuging efficiency is increased; escaping of dispersed carbon dioxide can be prevented, carbon dioxide utilization rate can be increased, and algae liquid pH can be adjusted fast; convection between the upper layer and the lower layer of the algae liquid can be promoted effectively; continuous microalgae cultivation can be achieved.