Process Research Of Coupling Treatment Of High-salinity Organic Wastewater With High Value Chemicals Production By Microalgae

With the rapid development of industrial enterprises,the amount of high-salinity organic wastewater is increasing year by year.This type of wastewater has high salinity,high COD concentration,and is difficult to biochemically treat.In recent years,studies have found that salt-tolerant microalgae can work under high salinity conditions.It grows,and can accumulate high value-added products in the cell while growing.Therefore,this study uses salt-tolerant microalgae to treat this type of wastewater as a resource to investigate its treatment effect and process mechanism.The study first selected the algae species through literature comparison,and further carried out the salinity tolerance and polyculture adaptability test results of the selected microalgae.Finally,Tisochrysis lutea and Dunaliella salina were selected.For high-salinity organic wastewater treatment.In the study of using Tahitian golden algae to treat high-salinity glycerin wastewater,firstly,the effect of different glycerin concentrations on the treatment effect of glycerin wastewater was investigated.Tisochrysis lutea grows best when the salinity of 21 g/L Na Cl is 1 g/L glycerol,21 Na Cl(21Na Cl means 21.2 g sodium chloride per 1L of artificial seawater)1g/L glycerol and 21 Na Cl 0.7 g /L glycerol has the best degradation effect on nitrogen;21Na Cl 0.7 g/L glycerol has the best degradation effect on phosphorus,and 21 Na Cl 1 g/L glycerol has the worst degradation effect on phosphorus.The 21 Na Cl 0.5 g/L glycerol group produced the highest fatty acid content and the highest DHA content.Investigate the effect of different salinity on Tisochrysis lutea’s treatment of high-salinity glycerin wastewater and the influence of biomass accumulation.The growth of Tisochrysis lutea under the condition of 30 Na Cl 0.5 g/L glycerol was the best;the21Na Cl 0.5 g/L glycerol group had the best effect in degrading nitrogen.The increase in salinity is not conducive to the degradation of phosphorus by Tisochrysis lutea.Tisochrysis lutea has a good degradation effect on the degradation of glycerol under different salinity conditions;the 30 Na Cl 0.5 g/L glycerol group has the highest fatty acid yield,and the yield of DHA generally shows a downward trend with the increase of salinity.Explore the effects of salinity and glycerin on the degradation of high-salinity pickling wastewater and the output of biologically active substances by Dunaliella salina.The higher the salinity,the greater the impact on the growth of Dunaliella salina.Dunaliella salina has little difference in the degradation effect of nitrogen in the experimental group containing glycerol,while the control group without glycerin has a significantly poorer degradation effect on nitrogen;the degradation rate of phosphorus is different under different salinity conditions,and varies with salinity.The slower the phosphorus degradation rate of Dunaliella salina is,the phosphorus removal rate reaches more than99%;the degradation of COD is also affected by different salinity,the higher the salinity,the slower the degradation rate of COD,and the degradation effect has no effect;30Na Cl1 g/L glycerol has the highest fatty acid content.Compared with low salinity,Dunaliella salina has higher fatty acid content in high salinity,and the better the growth of Dunaliella salina,the more fatty acid content may accumulate.For domesticated Dunaliella salina,the treatment effect and biomass accumulation of high-salinity salting wastewater were investigated.The growth of domesticated Dunaliella salina under the condition of 50 Na Cl 1 g/L glycerol is the best;the effect of degrading nitrogen is the best under the condition of 70 Na Cl 1 g/L glycerol;the removal rate of phosphorus in all experimental groups is above 90%;the domesticated Dunaliella salina is The degradation effect of COD is very good.Except for the removal rate of 120 Na Cl 1 g/L glycerol,the removal rate of the other experimental groups is 100%;the domesticated Dunaliella salina class under the condition of 21 Na Cl 1 g/L glycerol The concentration of carotene is the highest;the content of fatty acids is the highest under the condition of120 Na Cl 1 g/L glycerol.The salt tolerance of Dunaliella salina after domestication is not only increased,but the higher the salinity,the higher the fatty acid content.Figure [51] table [9] reference [111]...