**6. Conclusion**

The result of several studies showed that the immobilized algae in alginate beads can be a potential alternative system in the removal of nutrients, heavy metals and organic compounds from primary settled effluent to reduce the contaminant load from wastewater treatment plants to the environment. Meanwhile, application of alginate hydrogel, composite and nanocomposite can be safe methods to remove organic and inorganic substances from water.

*Alginate: Wastewater Treatment DOI: http://dx.doi.org/10.5772/intechopen.110148*
