Membrane microalgae photobioreactor for realizing in-situ solid-liquid separation and culture method thereof

Abstract

The invention discloses a membrane microalgae photobioreactor for realizing in-situ solid-liquid separation. The membrane microalgae photobioreactor comprises a liquid level balance water tank, a reactor main body, a micropore diffuser, a hollow fiber membrane assembly and a constant flow pump. In the culture method of the membrane microalgae photobioreactor, a culture solution enters the reactor main body through the liquid level balance water tank, required nutrients are provided for the growth of microalgae, the liquid level is kept constant, in-situ solid-liquid separation of a cultured algae solution is realized by using the hollow fiber membrane assembly arranged in the middle of the reactor, water is drained out of the constant flow pump through the membrane assembly under the suction filtration action of the constant flow pump, microalgae cells are kept in the reactor, and harvesting of microalgae cells is performed periodically. The novel membrane microalgae photobioreactor capable of realizing in-situ solid-liquid separation is simple in structure and convenient to operate. The membrane microalgae photobioreactor can run under a high hydraulic load while microalgae culture is performed by using effluent and the like with low nitrogen and phosphorous contents in urban sewage treatment plants, so that the running efficiency of the photobioreactor is increased greatly.

Description

technical field [0001] The invention relates to the technical field of algae cultivation reactors, in particular to a membrane microalgae photobioreactor for realizing in-situ solid-liquid separation. [0002] The present invention also relates to a method for cultivating microalgae using the above-mentioned device. Background technique [0003] Microalgae have the characteristics of rapid growth and high photosynthetic efficiency, and can effectively use solar energy to convert inorganic nutrients, CO 2 、H 2 Substances such as O are converted into organic compounds. Due to the advantages of high oil content, easy cultivation, high yield per unit area, and no occupation of arable land, it is considered to be the only known raw material that may replace fossil fuels. In addition, microalgae can also fix CO in the air during the growth process. 2 Contribute to the mitigation of the greenhouse effect. [0004] In the large-scale cultivation of microalgae, the closed photobi...

AI Technical Summary

Problems solved by technology

However, compared with the artificially prepared microalgae culture solution, the concentration of nitrogen and phosphorus in these waste waters is low, the growth rate of the microalgae is slow, the production capacity of the reactor is low, and it is also difficult to obtain a high-concentration microalgae culture solution. Facilitate subsequent harvesting of microalgal cells

In order to maintain a high growth rate of microalgae in the photobioreactor, it is necessary to increase the influent flow of the reactor accordingly to increase the supply of nitrogen and phosphorus. The traditional photobioreactor has no solid-liquid separation function, and the hydraulic pressure in the reactor The residence time and the residence time of microalgae are the same, and increasing the influent flow rate will shorten the residence time of microalgae in the reactor, reduce the concentration of algae liquid in the reactor, and cause the microalgae per unit volume of the reactor to decrease. Reduced production capacity

Therefore, the traditional photobioreactors used to cultivate microalgae are difficult to meet the needs of microalgae cultivation in water with low nitrogen and phosphorus content.

Images