响应面法优化藻菌共生系统氮磷去除能力研究

Study on the nitrogen and phosphorus removal by the algal and bacterial symbiotic system based on response surface methodology optimization

对污水处理厂二级出水进行深度处理可以有效缓解水体富营养化,相比于活性污泥法,藻菌共生系统对氮磷的去除更加高效。文章选用小球藻与活性污泥共生系统,针对光照强度、曝气量、CO2体积分数进行了单因素实验和响应面实验。结果表明:在单因素方面,柱状光生物反应器中的光照强度、曝气量、CO2体积分数对藻菌共生系统的效率有很大的影响,当光照强度为5000 lx,曝气量为0.6 L/min,CO2体积分数为10%时,藻菌共生系统拥有最佳的去除效率;而在响应面方面,当最优条件为光照强度为5000 lx,曝气量为0.6 L/min,CO2为10.5%时,得到的结论与单因素分析实验基本一致;NH3-N和TP的去除率最高可分别达到97.3%、96.4%,而且持续的曝气避免了硝化作用和反硝化作用,对活性污泥法的复杂工艺起到了简化作用。

Advanced treatment of secondary effluent from wastewater treatment plants can effectively alleviate eutrophication.The algal and bacterial symbiosis system is more efficient for nitrogen and phosphorus removal than the activated sludge process.In this paper,the symbiotic system of Chlorella and activated sludge was selected,and the single factor experiment and response surface experiment were conducted for light intensity,aeration rate and CO2 ratio.The single factor experiment shows that there is a great variation that nitrogen and phosphorus removal effect of algal and bacterial symbiotic system was impacted,light intensity,oxygen and carbon dioxide in columnar photobioreactor.The algal bacteria symbiosis system has the best nitrogen and phosphorus removal effect with light intensity 5000 lx,aeration rate 0.6 L/min and carbon dioxide ratio 10%.The response surface experiment shows that the optimal conditions are 5000 lx light intensity,0.6 L/min aeration,and 10.5%carbon dioxide,which is basically consistent with the conclusion obtained from the experiment of single factor analysis.The removal rates of NH3-N and TP reaches 97.3%and 96.4%,respectively,and the continuous aeration avoids nitrification and denitrification,thus simplifying the complex process of activated sludge process.