A method for improving the efficiency of macroalgae anaerobic fermentation

Abstract

The invention belongs to the technical field of biogas fermentation and particularly relates to a method for improving anaerobic fermentation efficiency of giant kelp. Through use of ceramsites in an anaerobic fermentation system of giant kelp, a biogas yield of the system is significantly improved, a fermentation delay period is shortened, system acidification is relieved and a H2S yield of the system is significantly reduced and thus methanogen activity inhibition caused by toxic gas H2S is reduced and later methane purification is promoted. The method is easy to operate, utilizes cheap and easily available raw materials, improves a biogas yield, shortens fermentation time, reduces toxic gas emission and has high economic benefits.

Description

technical field [0001] The invention belongs to the technical field of biogas fermentation, in particular to a method for improving the efficiency of macroalgae anaerobic fermentation. Background technique [0002] Worldwide, the energy shortage and environmental pollution caused by the use of fossil energy are becoming more and more serious, which makes the use of anaerobic fermentation technology to obtain clean and renewable energy more and more attention. Biogas is an important product of anaerobic fermentation technology, the main components are methane (45-70%), carbon dioxide (25-50%), water (0-10%), nitrogen (0-5%), oxygen (0-3 %), and trace amounts of hydrogen sulfide, ammonia, etc. Generally, the main component of biogas that can be used as energy is methane, which can be used as vehicle gas, residential gas, etc. Therefore, increasing the methane production of anaerobic fermentation system has considerable economic value. [0003] Giant algae (macroalgae) is an ...

AI Technical Summary

Problems solved by technology

Due to its high water content, high sugar content, and low fat content, it is easily utilized by hydrolytic microorganisms during anaerobic fermentation, and a large amount of organic acids (VFA) are generated by decomposing the substrate in a short period of time, and VFA cannot be processed by the downstream in a timely manner. The use of microorganisms such as methanogens causes a large amount of organic acids to accumulate, which makes the fermentation system acidify, the pH drops sharply, and the activity of various microorganisms, especially the methanogens, is inhibited, eventually leading to the collapse of the system

The acidification problem makes it difficult for the anaerobic digestion of macroalgae to operate under a high organic load, which restricts the production efficiency and economic benefits to a certain extent

[0006] The publication date is February 13, 2013, the publication number is CN102925493A, and the invention name is the invention patent of straw anaerobic fermentation biogas accelerator and its preparation method and application. The invention adds the accelerator in the straw wet anaerobic fermentation process, The accelerator is composed of iron, cobalt, nickel and other trace elements as well as phosphate, organic matter, pyruvate, fly ash and bentonite, which can increase methane production, but have no effect on H 2 The reduction effect of S production is not reflected. In addition, the accelerator is a mixed powder. After use, it cannot be completely transferred out of the fermentation system, cannot be reused, and may cause pollution to the fermentation system.

[0007] The publication date is July 9, 2014, the publication number is CN103911397A, and the invention name is an invention patent for a method of using tourmaline products to increase biogas yield. The invention is used in the mixed anaerobic fermentation system of livestock manure and straw. Add tourmaline products, methane production and COD removal rate are all improved, but the price of tourmaline used in this method is relatively high, which makes the cost of this method increase, and the density of tourmaline is high, which is not conducive to its uniformity in the fermentation system. dispersion

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