**4.4 Phycoremediation**

It is an excellent form of remediation in aquatic ecosystems. Microalgae, "wonder organisms," are capable of accomplishing bioremediation efficiently by two mechanisms, namely, bioassimilation and biosorption. They have the capability to grow in polluted water as "algal blooms" and assimilate various pollutants. Industrialization has led to increased emission of pollutants into ecosystems. Metal pollutants can easily enter the food chain if heavy metal-contaminated soils are used for the production of food crops.

