当前的世界环境

水占地71％的地球表面，对所有已知的生活形式至关重要。但只有2.5％的地球水是淡水。Due to industrialization and Urbanization it is becoming more polluted and risk of this polluted water consumption and its sanitation problem is increasing day to day in most of the developing countries, so it has become anessential need for today’s environment to protect water from getting polluted or develop its cost effective remedial method for its protection. Literature survey was done to find out the new, low-cost waste water treatment methods in which we had found that Microalgae has the natural wastewater treatment properties. It has the self cleansing power due to which it abstracts Nitrate 99%, sulphate 84% and Phosphate 73% for its growth and development. During their growth they trap sun light and CO₂从环境中获得光合作用。在文献的平均审查时间我们发现使用微藻的废水处理具有常规方法的阳性应用数量，因为它可用于废水处理，CO2封存，成本效益，卫生以及生产可再生来源的生产诸如生物柴油，生物燃料，甘油，甲烷气体，氢气，生物元素等的能源。总体综述已经得出结论，这种用于使用微藻治疗城市废水的绿色技术方法应适用于所有开发和发达国家进行废水处理，以便保护环境污染因工业和社会废水的废水导致。