What happened to the fixation activity of calcium alginate by folk remedies?

Production process of calcium alginate
Description of process flow:
After the kelp is weighed, it is soaked in water 5 times the weight of dry kelp for 20 hours, drained, soaked in tap water and liquid alkali for 3 hours, and the wet kelp soaked for five times is sent to a pulverizer to be crushed to 2-3mm, washed with water, dewatered in a cage and sent to a digester; Adding 1% hot alkaline water (sodium carbonate) at 80℃ to kelp in a digester, stirring uniformly, standing for two hours, performing primary pulping, digesting for one hour, performing secondary pulping, and digesting for 0.5 hour, performing tertiary pulping, then placing in a dilution pool, diluting until it reaches Engel's for 100-120 seconds, uniformly mixing with compressed air, sending to a foaming machine for foaming and settling for 2.5-3 hours. The filtrate is pumped into a calcification system for calcification, and chlorine gas is added for bleaching at the same time, and 1% calcium solution (calcium chloride concentration is 10%) with glue solution is added, which is foamed by a foaming device and stirred at high speed, then enters an aging tank, and then enters a decalcification bucket to be decalcified with 5% hydrochloric acid, and then enters a cage for dehydration. After three decalcification, it is squeezed and dehydrated to generate alginic acid, which is then sent to a liquid phase converter and added with 75% ethanol solution. Neutralization to pH 9, centrifugal dehydration (distillation and recovery of waste ethanol solution), granulation and granulation of centrifugal sodium alginate, drying in a dryer until the water content is 16%-17%, and then grinding in a mill to 40.Eye, after inspection, packaging factory.

　　The results showed that the optimal immobilization conditions were sodium alginate concentration of 3%, CaCl2 _ 2 concentration of 2%, and the ratio of cell mass to embedding dose of 2: 1. The optimum pH and temperature of immobilized particles for dye decolorization are about 8 and 30℃, which have the characteristics of low temperature resistance, high tolerance limit of dye concentration and reusability, but its mechanical strength decreases after strong alkaline, high temperature and repeated use. The decolorization effect of immobilized bacteria on dye wastewater with glucose as external carbon source is good, and the appropriate concentration is 1 g/L. Adding immobilized particles in anaerobic sludge reactor can improve the dye removal efficiency.

　　With the rapid development of textile industry, the consumption of dyes and the production of textile printing and dyeing wastewater are also increasing in proportion. Among them, azo dyes have become the largest amount of dyes in industry because of their good fastness properties, and are widely used in textile, leather, food, cosmetics and other industries [1], and their output accounts for about 70% of the total dyes [2].

　　Azo dyes in biological treatment rely on azo reductase produced by anaerobic microorganisms to break their azo bonds and produce aniline small molecules, which are further degraded by subsequent aerobic treatment [3]. In recent years, many researchers [4-6] have successfully screened out strains with high decolorization ability for some azo dyes, and identified them and studied their decolorization characteristics.

　　Microbial immobilization technology is a new biotechnology which came into being in 1980s. It can enclose microorganisms in natural polymer polysaccharides or synthetic polymer gels, thus immobilizing microorganisms. It has the advantages of high cell density, strong activity, strong toxicity tolerance and reusability. In recent years, it has been widely used in the treatment of refractory wastewater.

　　At the same time, by adding immobilized dominant strains screened from nature into the wastewater biological treatment system, the treatment capacity of the system for target substances can be improved, the sludge performance can be improved, the stability of the system can be enhanced, and the load impact resistance can be improved, which is also conducive to maintaining a high strain concentration in the reactor and easily realizing solid-liquid separation. A large number of studies show that [8-10], the dominant strains treated by immobilization technology can be added to the treatment system of printing and dyeing wastewater to achieve biological enhancement, and to some extent, the phenomenon of strain loss and assimilation can be avoided.