Research on Influencing Factors of Treating Aquaculture Wastewater by Microalgae
According to the characteristics of high nitrogen and phosphorus content,low CODMn concentration and serious imbalance of carbon-nitrogen ratio in aquaculture wastewater,combined with microalgae photosynthesis,nitrogen,phosphorus and other nutrients in water can be converted into microalgae biomass energy,thus realizing the advantage of nitrogen and phosphorus removal.Single factor analysis was used to investigate the effects of light intensity,pH and aeration on the treatment of culture tail water by microalgae.The results showed that microalgae can well meet the needs of culture tail water treatment,nitrogen and phosphorus removal could be realized without external carbon source.Light intensity and influent pH were the key factors affecting the removal of TN and TP by microalgae.The light intensity is 3000 Lux,the influent pH was 9,and the experimental time need to last 7 days.TN decreases from 13 mg/L to below 5 mg/L,and TP reduced from 1.6 mg/L to below 0.1 mg/L,which can meet the secondary standard of"Water discharge standard for aquaculture".When the CODMn was below 15 mg/L,the removal of organic matter by microalgae was not affected by light intensity,aeration and influent pH.The study provided scientific basis and technical support for the application of microalgae in aquaculture wastewater treatment.
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