Research On Degraduation Of Typical PPCPs And Resources Productivity By Microalgae

Pharmaceuticals and Personal Care Products(PPCPs)are one of the most popular new pollutants.PPCPs are a large micro-pollutant system,including antibiotics,anti-inflammatory drugs,lipid-lowering drugs,musk and hormones.Drugs are known more than 3000 kinds of compounds,raw materials,annual output of 2 × 106 tons;personal care products are also known to thousands of compounds,raw materials,annual output of 1 × 106 tons.As early as 2003,China has become the world’s largest producer of drugs,its consumption is also much higher than other countries,because PPCPs have strong persistence,bioactivity,bioaccumulation and slow degradation characteristics,making it Long-term exposure to human and aquatic organisms,terrestrial organisms,so the residue of such substances on the environmental growth of long-term potential impact is inevitable.At present,the urban sewage treatment plant can not guarantee the effective removal of PPCPs active ingredients and other organic pollutants.The use of ozone oxidation,activated carbon treatment and membrane filtration of PPCPs is a viable method,but the energy consumption is too large,the cost is too high,there is no recyclable resources and energy after treatment.At present,microalgae treatment technology as a green,emerging technology in the sewage treatment began to be applied.Microalgae can not only treat the remaining nitrogen and phosphorus in the secondary effluent,but also through its own fixed carbon dioxide,synthetic fat and carbohydrates.The resulting fats and oils can be used as biomass diesel;the resulting carbohydrates can be used as fermentation substrates in the process of producing alcohol for large-scale practical projects.In this paper,Chlamydomonas sp.Tai-03,a new algae species isolated from freshwater bodies in southern Taiwan,was used to optimize the growth conditions from light intensity,initial nitrogen source and temperature,and to study Tai-03 Bisphenol A,tetracycline,ciprofloxacin,sulfadiazine and sulfamethoxazole,and the effect of PPCPs on the sugar production of Tai-03.The results showed that the optimum growth conditions were as follows: light intensity was 300 μmol / m2 / s,the initial nitrogen concentration was one quarter of the nitrate concentration of BG-11 medium(547 mg / L)at a culture temperature of 30 ° C.Under the optimized conditions,the highest trehalose content was 83.79% on the fifth day of the deficiency stage,and the highest oil yield was 27.94% on the 7th day of nitrogen deficiency.Sugar production is the amount of oil produced 3 to 5 times,that Tai-03 is a production of algae.The effects of Tai-03 on the removal efficiency of five kinds of PPCPs were carried out under the optimal conditions.Three concentrations of 1: 5 and 10 mg / L were selected for each target pollutant.The experimental data showed that Tai-03 haddifferent concentrations and the removal rate of sulfadiazine at different concentrations was about 50%.The removal rate of sulfamethoxazole was about 20%.The removal rates of bisphenol A,tetracycline,ciprofloxacin,sulfadiazine and sulfamethoxazole were 13.29%,21.8%,17.26%,34.4% and 1.4% respectively.Hydrolysis of tetracycline,ciprofloxacin and the removal rates of sulfadiazine were 48.9%,9.82% and 2.45%,respectively,and the hydrolysis rate of the other two PPCPs was almost zero.Experiments show that the adsorption capacity of Tai-03 on five kinds of PPCPs is none at the end of the experiment.According to the analysis of intermediates,bisphenol A,tetracycline and ciprofloxacin in the indirect process occurred in the open-loop reaction,sulfadiazine and sulfamethoxazole in Tai-03 under the action of the chain-breaking reaction occurred.The analysis of the intermediates shows that Tai-03 has biodegradability to five PPCPs and provides the basis for deducing the degradation pathway of PPCPs.By comparing the effects of five PPCPs on the fixed carbon dioxide of Tai-03,it was found that the maximum CO2 fixation rate of 5 mg / L bisphenol A was2472.88 mg / L / dThe effects of PPCPs on the production capacity of Tai-03 were studied.It was found that ciprofloxacin could promote the yield of oil and fucose in Tai-03.Sulfadiazine could promote the production of Tai-03.Tetracycline could inhibit the production of Tai-03 Oil,bisphenol A can inhibit Tai-03 sugar production.