Control method for biological flocculant XM-11 fermentation process grading oxygen supply

Abstract

The present invention relates to biological flocculant, and is especially biological flocculant XM-11 fermenting process with controlled staged oxygen supply. Microbe Nocardia sp. XM-B11 is cultured in the fermenting culture medium through the seed culturing in the inoculation amount of 8-15 % for 8-16 hr and the liquid fermentation at 25-30 deg.c for 30-56 hr including the initial fermentation stage of 0-20 hr in stirring rotation speed of 100-150 rpm. The process can ensure the excellent growth of the spawn in the initial fermentation stage and the optimized composing state of the biologicalflocculant in the later fermentation stage, and has low power consumption and low production cost.

Description

technical field

[0001] The invention relates to a biological flocculant, in particular to a method for controlling oxygen supply in stages during the fermentation process of the biological flocculant XM-11. Background technique

[0002] At the end of the 1980s, Japan made remarkable achievements in the development of microbial flocculants. Kurane Ichiro and others from the Industrial Technology Research Institute of the Ministry of International Trade and Industry have isolated the S-1 strain of Rhodococcus erythroflates from the soil. And obtained the first biological flocculant-NOC-1 produced by it, which is still the best biological flocculant found so far. Kurane has carried out in-depth research on it, including the screening of its producing bacteria, optimization of fermentation conditions, separation and purification, analysis of molecular structure and application (Kurane R, Toeda K, Takeda K, Suzuki T.Culture condition for production of microbial flocculant by Rho...

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