paper (Double Rings 101). The resulting organic fertilizer medium
was dark-brown in colour with typical characteristics as shown in
Table 1. From the Table, the concentrated organic medium contains
two types of nutrients which are equally important to support microalgae
growth: (1) macronutrients, such as nitrogen, phosphorus,
potassium, calcium and magnesium and (2) micronutrients, such
as manganese, boron and iron.